JP4300324B2 - Age-related eye disease ameliorating agent, and pharmaceutical composition, food and drink, cosmetics and feed containing the same - Google Patents
Age-related eye disease ameliorating agent, and pharmaceutical composition, food and drink, cosmetics and feed containing the same Download PDFInfo
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- JP4300324B2 JP4300324B2 JP2005033913A JP2005033913A JP4300324B2 JP 4300324 B2 JP4300324 B2 JP 4300324B2 JP 2005033913 A JP2005033913 A JP 2005033913A JP 2005033913 A JP2005033913 A JP 2005033913A JP 4300324 B2 JP4300324 B2 JP 4300324B2
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- age
- lactoferrin
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- related eye
- eye disease
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Description
本発明は、加齢により機能低下または組織損傷した眼を修復・治療し、視力低下または失明を予防するための加齢性眼疾患改善剤、特に、これまで不可避の自然現象と考えられてきた眼の加齢変性(眼の老化現象)を遅らせ、または若返らせ、最終的には眼疾患の治癒をもたらす加齢性眼疾患改善剤に関する。さらに、本発明は、この改善剤を含む医薬組成物、飲食品、化粧料および飼料に関する。 The present invention is considered to be an aging eye disease ameliorating agent for repairing / treating an eye whose function has deteriorated or tissue damage due to aging, and to prevent visual loss or blindness, particularly an inevitable natural phenomenon so far. The present invention relates to an agent for improving age-related eye diseases that delays or rejuvenates eye age-related degeneration (eye aging phenomenon), and ultimately leads to healing of eye diseases. Furthermore, this invention relates to the pharmaceutical composition, food-drinks, cosmetics, and feed containing this improving agent.
医学の進歩に伴う平均寿命の延長にもかかわらず、先進国における失明率は増大の一途である。視覚は、生活の質(QOL)のなかで最重要ファクターであり、寿命が長くなっても、失明しては幸福な人生とはいえない。 Despite the increase in life expectancy associated with medical advances, blindness rates in developed countries continue to increase. Vision is the most important factor in quality of life (QOL), and even if the lifespan is long, it cannot be said that it is a happy life if it loses sight.
米国を始めとする先進諸国は失明を克服するための研究に躍起であるが、それに加え、近年、失明にも増して社会的な関心をひくようになったのが、視力の質(Quality of Vision: QOV)である。すなわち、従来は単に見えればよいと考えていた人々も、「もっと快適にものを見たい」、「コンタクトレンズなしでものを見たい」、「老眼鏡はかけたくない」等と考えるようになってきている。 Advanced countries such as the United States are eager to research to overcome blindness, but in addition to this, the quality of vision (Quality of (Vision: QOV). In other words, people who previously thought that they should simply be able to see are now thinking that they want to see things more comfortably, want to see things without contact lenses, and do not want to wear reading glasses. ing.
また、ドライアイ患者も増加している。ドライアイになると、眼が乾くために長時間眼を開けておくことができず、ドライアイは眼の疲れの最大原因になっている。こうした眼の疲れに対しては、従来は眼を休める程度の対応で充分な改善効果も見込めたが、近年のコンピューター技術の発達やインターネットの普及によって、仕事中に眼を休めることすらできず、眼の休養による充分な改善効果も見込めなくなってきている。 The number of dry eye patients is also increasing. When it comes to dry eyes, it is impossible to keep the eyes open for a long time because the eyes are dry, and dry eyes are the biggest cause of eye fatigue. With regard to such eye fatigue, it has been expected that a sufficient improvement effect can be expected by taking measures to rest the eyes, but due to the recent development of computer technology and the spread of the Internet, it is not possible to rest the eyes during work. It is no longer possible to expect sufficient improvement from eye rest.
このような、加齢性網膜黄斑変性症、緑内障、白内障、ドライアイ、老視といった眼疾患の多くが、加齢によるものである。したがって、視力の低下防止(失明対策)またはQOVの向上を図るためには、未だ発展途上の分野ではあるが、加齢を防止するためのアンチエイジング医学が非常に重要である。眼疾患の原因が加齢によるものであれば、加齢そのものに干渉することによって眼の病気を発症させないようにできないものかという観点から、眼の加齢を遅らせる、あるいは安全に修復することができる抗加齢物質、若返り物質が世界的に希求されている。 Many of these eye diseases such as age-related retinal macular degeneration, glaucoma, cataract, dry eye and presbyopia are caused by aging. Therefore, anti-aging medicine for preventing aging is very important in order to prevent a decrease in visual acuity (measures for blindness) or improve QOV, although it is still a developing field. If the cause of the eye disease is due to aging, it may be possible to delay the aging of the eye or restore it safely from the viewpoint of preventing the development of an eye disease by interfering with the aging itself. Anti-aging substances that can be rejuvenated and rejuvenating substances are in demand worldwide.
眼疾患の中でもとりわけ高齢者に多発し、失明に至る疾患として世界的な課題とされているのは、加齢性網膜黄斑変性症(Age−related Macular Degeneration: AMD)である。AMDは、65歳以上の高齢者に多く見られ、失明の原因となる病気であり、厚生労働省の特定疾患に指定されている。この病気にかかると、視野がぼやけ、線が歪んで見え、視野の中央部にいくつかの黒点が現れる。日本では、推定患者数が1万5千人と比較的少ないが、2004年の米国では初期のAMDが1,500万人、失明の危険がある重症患者が160万人と推定されほど高齢者に多発する眼疾患である。しかも、AMDは白内障と違って治療法が確立されておらず、現状では有効な治療手段がない。疫学調査ではルテインおよびゼアキサンチンを含む黄緑野菜を多く摂取する結果、これらカロチノイドの血中濃度が高い人は発症リスクが低いことがわかっているが、ルテインおよびゼアキサンチンを摂取してもADMの発症および進行に影響がないことが大規模な二重盲検試験によって明らかにされている。 Among eye diseases, Age-related Macular Degeneration (AMD) is a world-wide problem that frequently occurs in the elderly and leads to blindness. AMD is a disease that is frequently seen in elderly people over the age of 65 and causes blindness, and is designated as a specific disease by the Ministry of Health, Labor and Welfare. When this illness occurs, the field of view is blurred, the lines appear distorted, and several black spots appear in the center of the field of view. In Japan, the estimated number of patients is relatively small at 15,000, but in the US in 2004, the early AMD was estimated at 15 million, and the number of critically ill patients at risk of blindness was estimated at 1.6 million. It is a frequent eye disease. Moreover, unlike cataracts, AMD has not established a treatment method, and currently there is no effective treatment means. Epidemiological studies have shown that people who have high blood levels of these carotenoids have low risk of developing as a result of ingesting large amounts of yellow-green vegetables containing lutein and zeaxanthin. However, even if lutein and zeaxanthin are ingested, the occurrence of ADM and Large double-blind trials have shown no effect on progression.
AMDは、その約9割を占める萎縮型と網膜の血管新生を伴う滲出型とに分類される。このうち失明のリスクが高い滲出型では、診断半年後から1年半後に重篤な視力減退が起こり、失明が多発するが、現在、その進行をくい止め、また確実に失明を阻止する治療手段はない。AMDの危険因子は、年齢、家族歴、青い目、喫煙、血管障害、黄緑野菜の摂取不足、強度の光線に長時間暴露されること等であるが、中でも、年齢は発症と最も強い相関があり、血族に患者が存在する家族歴も10〜20%の相関があるとされている。また、虚血性心疾患、高血圧症等の心血管病との高い相関も注目されている。滲出型AMDにより失明に至る過程には、網膜の炎症および炎症部位を栄養する血管新生が関わっている。そのため、網膜の血管新生を抑制すれば、滲出型AMDの進行を阻止し、失明を防止できるものと考えられる。 AMD is classified into an atrophic type, which accounts for about 90%, and an exudative type with retinal neovascularization. Of these, the exudative type, which has a high risk of blindness, causes severe visual loss and occurs frequently after one and a half years from the diagnosis, but currently there are no treatments that can stop the progression and reliably prevent blindness. Absent. Risk factors for AMD include age, family history, blue eyes, smoking, vascular disorders, inadequate intake of yellow-green vegetables, prolonged exposure to intense light, etc. Among them, age has the strongest correlation with onset There is also a 10-20% correlation between the family history of patients in the family. In addition, a high correlation with cardiovascular diseases such as ischemic heart disease and hypertension has attracted attention. The process leading to blindness by wet AMD involves inflammation of the retina and angiogenesis that nourishes the site of inflammation. Therefore, it is considered that if the retinal neovascularization is suppressed, the progression of wet AMD can be prevented and blindness can be prevented.
血管新生には、生理的なものと、癌、炎症等で見られる病的なものとがある。生理的血管新生、とりわけ胎生期の血管新生は、炎症、出血、血液凝固を伴なわず、血管内皮細胞に特異的に作用する血管新生因子(VEGF)やアンジオポエチン等の因子によって整然と制御されたプロセスである。それとは対照的に、癌、炎症等で見られる病的な血管新生には、線維芽細胞成長因子(FGF)やチミジンフォスフォリラーゼ等の内皮細胞に対して非特異的な因子が関与する。しかも、病的な血管新生は、炎症、出血、血液凝固等を必ず伴っており、これが血管新生像を複雑なものとしている。病的な新生血管は、破綻・出血して血栓を生じ、血管から血漿成分がしみ出して周囲の組織にフィブリノイド変性を起こす。このような過程を経て網膜の神経細胞が破壊され、失明に至るのである。 There are two types of neovascularization: physiological ones and pathological ones found in cancer, inflammation and the like. Physiological angiogenesis, especially embryonic angiogenesis, is an orderly controlled process by factors such as angiogenic factors (VEGF) and angiopoietin that act specifically on vascular endothelial cells without inflammation, bleeding, or blood clotting. It is. In contrast, pathological angiogenesis seen in cancer, inflammation, etc. involves factors that are not specific for endothelial cells such as fibroblast growth factor (FGF) and thymidine phosphorylase. In addition, pathological angiogenesis is always accompanied by inflammation, bleeding, blood coagulation, and the like, which complicates angiogenesis. Pathological new blood vessels rupture and bleed to form blood clots, and plasma components ooze out from the blood vessels, causing fibrinoid degeneration in the surrounding tissues. Through these processes, neurons in the retina are destroyed, leading to blindness.
したがって、AMDを予防または治療するには、少なくとも、(1)安全であること、(2)加齢変性した眼組織を若返らせること、(3)網膜の血管新生を阻止すること、および(4)抗炎症作用があること、の4条件を備えた薬剤が必要である。最近、AMD予防・治療薬として血管新生因子(VEGF)の遺伝子発現に干渉するリボ核酸断片(RNAi)が特に注目されている。既に米国ではRNAiを注射してAMDを治療することを目指し、バイオテクノロジーのベンチャー企業が数社も創立され、熾烈な開発競争を展開している。米国食品薬品局は、医薬品としての承認申請が行われた場合、最優先で審査することを公表している。AMDの予防・治療薬は緊急度が高いからである。 Thus, to prevent or treat AMD, at least (1) be safe, (2) rejuvenate age-degenerated ocular tissue, (3) prevent retinal neovascularization, and (4 ) Drugs with 4 conditions of having anti-inflammatory action are necessary. Recently, a ribonucleic acid fragment (RNAi) that interferes with gene expression of angiogenic factor (VEGF) has attracted particular attention as a preventive / therapeutic agent for AMD. Already in the United States, several biotechnology venture companies have been established with the aim of treating RNA by injecting RNAi, and fierce development competition is taking place. The US Food and Drug Administration has announced that if a drug application is submitted, it will be reviewed with the highest priority. This is because the preventive and therapeutic drugs for AMD are highly urgent.
加齢性眼疾患の予防・治療に従来用いられてきた製品は、ルテイン、ゼアキサンチン、アスタキサンチンなどのカロチノイド、視力に関係するビタミンA、抗酸化作用があるアスコルビン酸、ビタミンE、コエンザイムQ10等々を有効成分として含んでいる。 Products that have been used for the prevention and treatment of age-related eye diseases include carotenoids such as lutein, zeaxanthin, and astaxanthin, vitamin A related to visual acuity, ascorbic acid with antioxidant action, vitamin E, coenzyme Q 10 and the like. Contains as an active ingredient.
ラクトフェリン(以下、LFということがある)は、哺乳動物の乳汁中に含まれる可溶性の鉄結合性の糖タンパク質である。その分子量は、ウシで86,000、ヒトで88,000である。ラクトフェリンは、溶液中から鉄イオンを奪うことによって、抗菌活性を示すことがわかっており(非特許文献1)、従来、健康食品等の成分として利用されてきた。 Lactoferrin (hereinafter sometimes referred to as LF) is a soluble iron-binding glycoprotein contained in mammalian milk. Its molecular weight is 86,000 for cattle and 88,000 for humans. Lactoferrin has been shown to exhibit antibacterial activity by depriving iron ions from solution (Non-Patent Document 1) and has been conventionally used as a component of health foods and the like.
前記4条件のうち、安全性に関しては、牛乳から抽出したラクトフェリンが高い安全性を示すことが知られている(特許文献1)。すなわち、ラクトフェリンは、雌雄のビーグル犬およびラットに5g/kgを1回経口投与、または2g/kgを12週間連続経口投与しても何らの毒性も示さない。既に育児用調製粉乳、健康食品およびヨーグルト、飲料などに添加されており、不特定多数の人に摂取されて久しいにもかかわらず、ラクトフェリンの安全性に懸念を抱かせる情報は一切報告されていない。 Among the above four conditions, it is known that lactoferrin extracted from milk shows high safety regarding safety (Patent Document 1). That is, lactoferrin does not show any toxicity when 5 g / kg is orally administered to male and female beagle dogs and rats once or 2 g / kg is orally administered continuously for 12 weeks. Already added to infant formulas, health foods and yogurt, beverages, etc., no information has been reported that raises concerns about the safety of lactoferrin even though it has been consumed by an unspecified number of people. .
また、血管新生の阻害効果については、津田等(日本国立がんセンター)により、ラクトフェリンが化学発ガン剤による発ガンを抑制し、移植ガンの転移を抑制するのは、ガン細胞により誘導される血管新生を阻害するのも一因であると報告されている(非特許文献2)。 Regarding the angiogenesis inhibitory effect, it is induced by cancer cells that lactoferrin suppresses carcinogenesis by chemical carcinogens and suppresses metastasis of transplanted cancer by Tsuda et al. (Japan National Cancer Center). Inhibition of angiogenesis has also been reported to be a cause (Non-patent Document 2).
さらに、抗炎症作用については、ラクトフェリンを慢性炎症の病態モデルであるアジュバント関節炎ラットに経口投与すると、足関節の腫脹を抑制し、細菌リポ多糖を投与した際の血中TNF−α上昇を抑え、抗炎症サイトカインであるIL−10を上昇させるという報告があり(非特許文献3)、ラクトフェリンは慢性炎症に対し消炎作用を呈するものと考えられる。 Furthermore, for anti-inflammatory action, when lactoferrin is orally administered to adjuvant arthritic rats, which are chronic inflammation pathological models, it suppresses swelling of the ankle joint, suppresses blood TNF-α elevation when bacterial lipopolysaccharide is administered, There is a report that IL-10 which is an anti-inflammatory cytokine is increased (Non-patent Document 3), and lactoferrin is considered to exhibit an anti-inflammatory action against chronic inflammation.
一方、ラクトフェリンは涙液に多量に含まれるにもかかわらず、その眼に対する作用については充分に明らかになっていない。すなわち、このタンパク質が持つ本来の機能からラクトフェリンが感染防御、抗炎症作用を有することが想像されるものの、眼に対する具体的な薬理効果としては、角膜障害治療作用(特許文献2)および術後乱視予防作用(特許文献3)以外については報告されていない。すなわち、ラクトフェリンが、加齢性眼疾患の予防または治療に有効であることを具体的に示すデータは報告されておらず、ラクトフェリンが加齢性眼疾患を改善することは従来まったく知られていなかった。 On the other hand, despite the fact that lactoferrin is contained in a large amount in tears, its action on the eye has not been fully clarified. That is, although lactoferrin is supposed to have infection protection and anti-inflammatory action from the original functions of this protein, specific pharmacological effects on the eyes include corneal disorder treatment (Patent Document 2) and postoperative astigmatism. No report has been made other than the preventive action (Patent Document 3). In other words, no data specifically showing that lactoferrin is effective in preventing or treating age-related eye diseases has been reported, and it has not been known at all that lactoferrin improves age-related eye diseases. It was.
本発明は、眼精疲労、加齢性網膜黄斑変性症、緑内障、白内障、ドライアイ、老視等の、加齢に起因または関連する眼疾患(加齢性眼疾患ともいう)を予防または治療するために有効で、安全性の高い薬剤を提供すること、特に、加齢の過程に干渉することによってこれらの眼疾患を発症させない、加齢による機能低下または組織傷害を阻止する、または加齢減少を逆転させて若返らせることができる、眼疾患の予防または治療用薬剤を提供することを目的とする。さらに、本発明は、そのような薬剤を配合した加齢性眼疾患予防または治療用の医薬組成物、飲食品、化粧料および飼料を提供することを目的とする。 The present invention prevents or treats eye diseases caused by or related to aging (also referred to as age-related eye diseases) such as eye strain, age-related macular degeneration, glaucoma, cataract, dry eye, presbyopia, etc. To provide drugs that are effective and safe to do, in particular, do not cause these eye diseases by interfering with the aging process, prevent functional deterioration or tissue damage due to aging, or aging An object of the present invention is to provide a drug for preventing or treating eye diseases, which can reverse the decrease and rejuvenate. Furthermore, an object of this invention is to provide the pharmaceutical composition, food-drinks, cosmetics, and feed for age-related eye disease prevention or treatment which mix | blended such a chemical | medical agent.
本発明者らは、前記の課題を解決するために、広く天然素材に含まれている加齢性眼疾患予防または治療効果を有する可能性のある物質について、鋭意、探索を進めていたところ、ラクトフェリンが、加齢性眼疾患を予防・治療することができる、すなわち、老化した眼を若返らせる作用があること、そしてラクトフェリンが前記4条件をすべて満たす物質であることを見出し、本発明を完成するに至った。 In order to solve the above-mentioned problems, the present inventors have been diligently searching for substances that may have the effect of preventing or treating age-related eye diseases that are widely included in natural materials. Discovered that lactoferrin can prevent and treat age-related eye diseases, that is, has the effect of rejuvenating aging eyes, and that lactoferrin is a substance that satisfies all of the above four conditions, thereby completing the present invention. It came to do.
すなわち、本発明は、
〔1〕ラクトフェリンを有効成分として含有する加齢性眼疾患改善剤;
〔2〕加齢性眼疾患が、眼精疲労、加齢性網膜黄斑変性症、緑内障、白内障、ドライアイ、老視のいずれか1以上である、前記〔1〕記載の加齢性眼疾患改善剤;
〔3〕前記〔1〕または〔2〕記載の加齢性眼疾患改善剤を含む医薬組成物;
〔4〕前記〔1〕または〔2〕記載の加齢性眼疾患改善剤を含む飲食品;
〔5〕前記〔1〕または〔2〕記載の加齢性眼疾患改善剤を含む化粧料;
〔6〕前記〔1〕または〔2〕記載の加齢性眼疾患改善剤を含む飼料;
を提供する。
That is, the present invention
[1] Age-related eye disease ameliorating agent containing lactoferrin as an active ingredient;
[2] Age-related eye disease according to [1], wherein the age-related eye disease is one or more of eye strain, age-related macular degeneration, glaucoma, cataract, dry eye, and presbyopia Improver;
[3] A pharmaceutical composition comprising the age-related eye disease ameliorating agent according to [1] or [2];
[4] A food or drink containing the aging eye disease ameliorating agent according to [1] or [2];
[5] A cosmetic comprising the aging eye disease ameliorating agent according to [1] or [2];
[6] A feed containing the age-related eye disease ameliorating agent according to [1] or [2];
I will provide a.
本発明によりラクトフェリンを有効成分とする加齢性眼疾患改善剤、ならびにこれを有効成分として含有する加齢性眼疾患改善用医薬組成物、加齢性眼疾患改善用飲食品、加齢性眼疾患改善用化粧料、および加齢性眼疾患改善用飼料(以下、加齢性眼疾患改善剤等ということがある)が提供される。本発明の加齢性眼疾患改善剤等は、加齢性眼疾患の発症予防および発症後の治療に有用である。 Age-related eye disease ameliorating agent comprising lactoferrin as an active ingredient according to the present invention, a pharmaceutical composition for improving age-related eye disease containing the same as an active ingredient, food and drink for improving age-related eye disease, and aging eye A disease improving cosmetic and an age-related eye disease improving feed (hereinafter sometimes referred to as an age-related eye disease improving agent) are provided. The agent for improving age-related eye diseases of the present invention is useful for preventing the onset of age-related eye diseases and treating them after onset.
本発明の加齢性眼疾患改善剤等は、加齢性眼疾患の予防・治療に従来用いられてきた化合物と比べ、安全性が高く、確実に加齢性眼疾患を改善する特徴がある。また、ラクトフェリンは乳汁、粘液や好中球の成分であることから、加齢性眼疾患改善剤等は、他の薬物の生物活性を損なうことがなく、それらとの併用が可能である。 The agent for improving age-related eye diseases of the present invention is characterized by higher safety and surely improving age-related eye diseases compared to compounds conventionally used for the prevention and treatment of age-related eye diseases. . In addition, since lactoferrin is a component of milk, mucus, and neutrophils, age-related eye disease ameliorating agents and the like can be used in combination with them without impairing the biological activity of other drugs.
本発明の加齢性眼疾患改善剤は、ラクトフェリンを有効成分として含有することを特徴とする。本発明において使用されるラクトフェリンとしては、ヒトおよび種々の動物、例えば、ウシ、ウマ、ブタ、ヒツジ、ヤギ、ラクダ等から得られる天然のラクトフェリン分子(鉄イオンの有無またはその含量、由来する生物種などを問わない)、遺伝子工学技術により改変されたラクトフェリン遺伝子に基づいて産生される組換え型ラクトフェリン、トランスジェニック動物が泌乳するラクトフェリンなどのラクトフェリンのほか、ラクトフェリンの活性フラグメントなどの機能的等価物のいずれであってもよい。したがって、本発明に関して用語「ラクトフェリン」は、特に示さない限り、これらの種々のラクトフェリンをも包含する意味で用いられる。 The agent for improving age-related eye diseases of the present invention is characterized by containing lactoferrin as an active ingredient. The lactoferrin used in the present invention includes natural lactoferrin molecules obtained from humans and various animals, such as cows, horses, pigs, sheep, goats, camels, etc. (presence or absence of iron ions or their contents, derived biological species). Functional lactoferrin such as lactoferrin produced by transgenic animals, lactoferrin produced by transgenic animals, and functional equivalents of lactoferrin, etc. Either may be sufficient. Therefore, the term “lactoferrin” in the context of the present invention is used to encompass these various lactoferrins unless otherwise indicated.
本発明においては、これらのラクトフェリンの1種または2種以上を適宜選択して用いることができる。ラクトフェリンは、公知の物質であって、市販されているものであるが、それを製造するには、公知の方法、例えばスルホン化担体を用いてラクトフェリンを精製する方法(特開平3−109400号公報)を工業的に有利に利用することができる。 In the present invention, one or more of these lactoferrins can be appropriately selected and used. Lactoferrin is a known substance and is commercially available. To produce it, a known method, for example, a method of purifying lactoferrin using a sulfonated carrier (JP-A-3-109400). ) Can be used industrially advantageously.
本発明の加齢性眼疾患改善剤は、ラクトフェリンを唯一の必須成分とするが、所望により、製薬または食品業界で公知の種々の成分などを含んでいてもよい。例えば、ビタミンA、ルテイン、ゼアキサンチン、アスタキサンチン、ビタミンC、ビタミンE等、従来から視力低下の回復に有効な作用を持つと考えられている成分を含むことができる。これらの他の有効成分をさらに含有させることによって、一層の加齢性眼疾患改善作用を期待できる。なお、本発明に関して加齢性眼疾患の「改善」は、予防および治療(軽快、治癒を含む)を包含する意味で用いられる。したがって、本発明の加齢性眼疾患改善剤は、加齢性眼疾患の予防または治療のいずれか一方または両方を目的とすることができる。 The agent for improving age-related eye diseases of the present invention contains lactoferrin as the only essential component, but may contain various components known in the pharmaceutical or food industry as desired. For example, ingredients such as vitamin A, lutein, zeaxanthin, astaxanthin, vitamin C, vitamin E, and the like that have been conventionally considered to have an effective action for recovery of vision loss can be included. By further containing these other active ingredients, a further aging eye disease improving effect can be expected. In the present invention, “amelioration” of age-related eye diseases is used in the meaning including prevention and treatment (including remission and cure). Therefore, the agent for improving age-related eye diseases of the present invention can be aimed at either or both of prevention or treatment of age-related eye diseases.
本発明の加齢性眼疾患改善剤は、添加剤として、製薬産業において日常的に使用されている賦形剤、崩壊剤、滑沢剤、結合剤、界面活性剤、流動性促進剤、着色剤、香料等を適宜添加して所望の剤型の医薬組成物とすることができる。本発明の加齢性眼疾患改善剤または医薬組成物の投与経路は、公知のいずれの経路であってもよく、例えば点眼、経口、経皮、注射、経腸、直腸内等の任意の経路を選択することができる。好ましくは点眼および経口投与である。 The aging eye disease ameliorating agent of the present invention includes, as additives, excipients, disintegrating agents, lubricants, binders, surfactants, fluidity promoters, colorings that are routinely used in the pharmaceutical industry. Agents, fragrances and the like can be added as appropriate to obtain a pharmaceutical composition of a desired dosage form. The administration route of the aging ophthalmic disease improving agent or pharmaceutical composition of the present invention may be any known route, for example, any route such as eye drops, oral, transdermal, injection, enteral, rectal, etc. Can be selected. Instillation and oral administration are preferred.
例えば、粉末剤、顆粒剤、錠剤、カプセル剤等の経口剤は、澱粉、乳糖、白糖、マンニット、カルボキシメチルセルロース、コーンスターチ、無機塩類等を用いて常法によって製剤化される。この種の製剤には、前記賦形剤の他に、結合剤、崩壊剤、界面活性剤、滑沢剤、流動性促進剤、着色料、香料等を適宜使用することができる。より具体的には、結合剤としては、例えば、澱粉、デキストリン、アラビアガム末、ゼラチン、ヒドロキシプロピルスターチ、カルボキシメチルセルロースナトリウム、メチルセルロース、結晶性セルロース、エチルセルロース、ポリビニルピロリドンが挙げられる。また、崩壊剤としては、例えば、澱粉、ヒドロキシプロピルスターチ、カルボキシメチルセルロースナトリウム、架橋カルボキシメチルセルロースナトリウム、結晶性セルロース、カルボキシメチルセルロース等が挙げられる。界面活性剤としては、大豆レシチン、蔗糖脂肪酸エステル等が、滑沢剤としては、タルク、ロウ、蔗糖脂肪酸エステル、水素添加植物油等が、流動性促進剤としては、無水ケイ酸、乾燥水酸化アルミニウム、ケイ酸マグネシウム等が、それぞれ挙げられる。 For example, oral preparations such as powders, granules, tablets and capsules are formulated by conventional methods using starch, lactose, sucrose, mannitol, carboxymethylcellulose, corn starch, inorganic salts and the like. In this type of preparation, in addition to the above-mentioned excipients, binders, disintegrants, surfactants, lubricants, fluidity promoters, colorants, fragrances, and the like can be appropriately used. More specifically, examples of the binder include starch, dextrin, gum arabic powder, gelatin, hydroxypropyl starch, sodium carboxymethylcellulose, methylcellulose, crystalline cellulose, ethylcellulose, and polyvinylpyrrolidone. Moreover, as a disintegrating agent, starch, hydroxypropyl starch, sodium carboxymethylcellulose, bridge | crosslinking sodium carboxymethylcellulose, crystalline cellulose, carboxymethylcellulose etc. are mentioned, for example. Surfactants include soy lecithin, sucrose fatty acid esters, lubricants include talc, wax, sucrose fatty acid esters, hydrogenated vegetable oils, etc., and fluidity promoters include anhydrous silicic acid and dry aluminum hydroxide. And magnesium silicate.
また、経口投与のほか、本発明の加齢性眼疾患改善剤、またはそれを含む医薬組成物または化粧料は、点眼等の方法で局所適用することによっても、加齢性眼疾患予防または治療効果を発揮する。局所適用剤とするには、その使用目的に応じて、通常用いられる公知の成分に配合することによって、液剤、固形剤、半固形剤等の各種剤形に調製することが可能であり、好ましい組成物としては、軟膏、ゲル、クリーム、スプレー剤、貼付剤、ローション、粉末等が挙げられる。例えば、本発明の加齢性眼疾患改善剤を、ワセリン等の炭化水素、ステアリルアルコール、ミリスチン酸イソプロピル等の高級脂肪酸低級アルキルエステル、ラノリン等の動物性油脂、グリセリン等の多価アルコール、グリセリン脂肪酸エステル、モノステアリン酸ポリエチレングリコール等の界面活性剤、無機塩、ロウ、樹脂、水、パラオキシ安息香酸メチル、パラオキシ安息香酸ブチル等の保存料等の1以上の成分と混合することによって、加齢性眼疾患改善用医薬組成物または化粧料を製造することができる。 In addition to oral administration, the age-related eye disease ameliorating agent of the present invention, or a pharmaceutical composition or cosmetic containing the same can be applied or applied locally by methods such as eye drops to prevent or treat age-related eye diseases. Demonstrate the effect. In order to obtain a topical application agent, it can be prepared into various dosage forms such as a liquid agent, a solid agent, a semi-solid agent and the like by blending with commonly known components depending on the purpose of use. Examples of the composition include ointments, gels, creams, sprays, patches, lotions, and powders. For example, the age-related eye disease ameliorating agent of the present invention includes hydrocarbons such as petrolatum, stearyl alcohol, higher fatty acid lower alkyl esters such as isopropyl myristate, animal fats and oils such as lanolin, polyhydric alcohols such as glycerin, glycerin fatty acids By mixing with one or more components such as ester, surfactant such as polyethylene glycol monostearate, inorganic salt, wax, resin, water, methyl paraoxybenzoate, butyl paraoxybenzoate, etc. A pharmaceutical composition for improving eye diseases or a cosmetic can be produced.
このような各種製剤の製造方法は、当業者には充分公知である。なお、本発明に関して「医薬組成物」という場合、人間に対して適用するもののほか、獣医学的に動物に対して適用するもの(獣医薬)をも含む。 Methods for producing such various preparations are well known to those skilled in the art. The term “pharmaceutical composition” in the context of the present invention includes not only those applied to humans but also those applied to animals veterinarily (veterinary medicine).
また、本発明の加齢性眼疾患改善剤は、経口投与するために、栄養剤や飲食品に添加して、飲食品または飼料としてヒトまたはヒト以外の対象動物に摂取させることもできる。このような飲食品または飼料の製造方法も当業者には公知である。 Moreover, in order to administer the age-related eye disease improvement agent of this invention orally, it can also be added to a nutrient or food-drinks, and can also be made to ingest in humans or a non-human target animal as food-drinks or feed. Such a method for producing a food or drink or feed is also known to those skilled in the art.
本発明の加齢性眼疾患改善剤またはそれを含む医薬組成物、飲食品、化粧料もしくは飼料を与えるべき対象となるのは、ヒトをはじめとして、ヒト以外の哺乳類、鳥類などの種々の動物であり、例えば、ウシ、ウマ、ブタ、ヒツジ、ヤギ、ニワトリ等の家畜、家禽類やイヌ、ネコ等のペット類が挙げられる。 The subject to be given the age-related eye disease ameliorating agent of the present invention or a pharmaceutical composition, food / beverage product, cosmetics or feed containing the same is not limited to humans, but also various animals such as mammals other than humans and birds. Examples thereof include livestock such as cows, horses, pigs, sheep, goats and chickens, and pets such as poultry, dogs and cats.
本発明の加齢性眼疾患改善剤の経口投与による有効量は、その製剤形態、投与方法、使用目的、および投与される対象の種類、年齢、体重、病状等によって異なり、それらに応じて各々に適した量で投与することができる。哺乳類に対して投与する場合、好ましくは体重1kgあたり2mg/日以上とすることができる。ヒトに投与する場合、一般的には、有効成分量として、1日あたり80mg〜160mg、例えば、成人1人当たり1日120mg以上の量であることができる。このような1日あたりの用量を一度にまたは分割して、本発明の加齢性眼疾患改善剤による加齢性眼疾患の予防、治療または状態の改善が必要とされている対象に対し、投与することができる。 The effective amount of the age-related eye disease ameliorating agent of the present invention by oral administration varies depending on the preparation form, administration method, purpose of use, and type, age, weight, medical condition, etc. of the subject to be administered, and depending on them, respectively. Can be administered in an amount suitable for the dose. When administered to a mammal, the dose can be preferably 2 mg / day or more per kg of body weight. When administered to humans, in general, the amount of the active ingredient may be 80 mg to 160 mg per day, for example, 120 mg or more per day per adult. For a subject in need of prevention, treatment or amelioration of age-related eye diseases with the agent for improving age-related eye diseases of the present invention by dividing such daily dose at once or divided, Can be administered.
本発明の加齢性眼疾患改善剤の点眼による有効量は、製剤形態、使用目的等により異なるが、適用する組成物全量を基準として、好ましくは0.001〜2重量%となるように、ラクトフェリンを配合すればよい。 The effective amount of the aging eye disease ameliorating agent of the present invention by instillation varies depending on the preparation form, purpose of use, etc., but is preferably 0.001 to 2% by weight based on the total amount of the composition to be applied. What is necessary is just to mix | blend lactoferrin.
本発明を実施例により詳細に説明するが、本発明はそれに限定されるものではない。 The present invention will be described in detail by way of examples, but the present invention is not limited thereto.
実施例1:加齢性眼疾患改善剤の製造
ナトリウムイオン吸着型スルホン酸陽イオン交換樹脂400gを充填したカラム(直径5cm×高さ30cm)を脱イオン水で十分に洗浄した後、このカラムに未殺菌脱脂乳40L(pH6.7)を流速25mL/minで通液した。通液後、カラムを脱イオン水で十分洗浄し、2.0M塩化ナトリウムを含む0.02M炭酸緩衝液(pH7.0)で溶出した。ラクトフェリンを含有する溶出画分をS−Sepharose FFカラムに吸着させ、脱イオン水で十分洗浄し、10mMリン酸緩衝液(pH7.0)で平衡化した後、0〜2.0M塩化ナトリウムの濃度勾配を溶出し、ラクトフェリンを含む画分を回収した。そして、その画分をゲル濾過クロマトグラフィーで処理し、凍結乾燥してラクトフェリン3.5gを得た。なお、このようにして得られたラクトフェリンの純度は93%であり、そのまま加齢性眼疾患改善剤として使用可能である。
Example 1: Manufacture of an agent for improving age-related eye diseases A column (
実施例2:ラクトフェリンを含有する加齢性眼疾患改善医薬組成物
株式会社NRLファーマ製造の腸溶性ラクトフェリン粉末(純ラクトフェリンとして10%を含有)を本発明の医薬組成物として使用した。
Example 2: Pharmaceutical composition for improving age-related eye diseases containing lactoferrin Enteric lactoferrin powder (containing 10% as pure lactoferrin) manufactured by NRL Pharma Co. , Ltd. was used as the pharmaceutical composition of the present invention.
試験例1:ラットにおける眼の加齢現象に及ぼす効果
ラットを実験動物として用い、眼の加齢現象に及ぼす効果を調べるために、生後1年8ヶ月〜2年半のウイスター系雌ラット(老齢)18頭を無作為に2群に分け、一群を、ラクトフェリンを投与していない群(「老齢対照群」または「対照群」ともいう;n=9)、他方を、ラクトフェリンを投与した群(「老齢ラクトフェリン(LF)摂取群」または「老齢LF摂取群」ともいう;n=9)として4週間飼育し、涙腺を光学顕微鏡と透過電子顕微鏡で観察した。なお、ラットの寿命は約2年半であるから、実験に使用したラットは、人の70〜80歳代に相当する。
Test Example 1: Effects on the aging phenomenon of the eyes in rats In order to investigate the effects on the aging phenomenon of the eyes using rats as experimental animals, Wistar female rats (aged ages 1 to 8 months to 2 and a half years old) ) 18 were randomly divided into two groups, one group not receiving lactoferrin (also referred to as “old age control group” or “control group”; n = 9), and the other group receiving lactoferrin ( Also referred to as an “aged lactoferrin (LF) ingestion group” or “aged LF ingestion group”; n = 9), the lacrimal glands were observed with an optical microscope and a transmission electron microscope. In addition, since the lifetime of a rat is about two and a half years, the rat used for experiment is equivalent to a person's 70-80 generations.
両群とも飼料と飲料水は自由摂取とし、対照群には粉末のラット用標準飼料(日本クレア、CE−2)を与え、LF摂取群には対照群と同じラット用標準飼料に実施例2記載の医薬組成物粉末を4%添加した飼料(飼料中のLF含量:0.4%)を与え、それぞれ4週間飼育した。同時に、若齢ラット群として、成熟期に達した5頭のラット(10週齢若齢ラット)もCE−2粉末を与えて4週間飼育した。 In both groups, feed and drinking water were allowed to be freely consumed, powdered standard diet for rats (Clea Japan, CE-2) was given to the control group, and the same standard diet for rats as the control group was given to the LF intake group. A feed (4% LF content in the feed) to which 4% of the described pharmaceutical composition powder was added was fed and bred for 4 weeks each. At the same time, as a group of young rats, 5 rats (10-week-old young rats) that reached maturity were also fed with CE-2 powder and bred for 4 weeks.
実験開始4週間後に各動物を屠殺し、それぞれの標本について涙腺摘出直前の体重および摘出直後の涙腺(左側)の重量を計測した。また、今回の光学顕微鏡および電子顕微鏡による観察には、対照群から6頭、LF摂取群から5頭をそれぞれ無作為に抽出した標本を用いた。それらの標本を用いて、常法にしたがって固定、脱水、包埋を行った後、準超薄トルイジン青染色切片ならびに超薄電子染色切片を作製し、光学顕微鏡および透過電子顕微鏡で観察した。なお、今回は老齢ラットにおけるラクトフェリン投与実験の評価を行う際に、成熟期に達した直後の若齢ラット(10週齢若齢ラット)涙腺細胞の構造を参考とした。 Four weeks after the start of the experiment, each animal was sacrificed, and the body weight immediately before lacrimal gland extraction and the weight of the lacrimal gland (left side) just after excision were measured for each specimen. In addition, in this observation with an optical microscope and an electron microscope, specimens obtained by randomly extracting 6 animals from the control group and 5 animals from the LF intake group were used. Using these specimens, fixation, dehydration, and embedding were performed according to a conventional method, and then a semi-ultra thin toluidine blue stained section and an ultra thin electron stained section were prepared and observed with an optical microscope and a transmission electron microscope. In addition, this time, when evaluating the lactoferrin administration experiment in an old rat, the structure of the lacrimal gland cell of the young rat (10-week-old young rat) immediately after reaching the mature stage was referred.
涙腺の平均重量に関する所見
老齢ラットの対照群(9匹)における涙腺重量平均値は、0.15gであり、LF摂取群(9匹)の涙腺重量平均値は、0.18gであった。また、それぞれの個体における涙腺の対体重比を算出し、さらに各群における対体重比の算術平均を求めた結果、老齢対照群の対体重比平均値は0.045%であり、老齢LF摂取群においては0.049%であった。この実験では両群の間には統計学的有意差は認められなかったものの、以上のように涙腺の重量平均値および対体重比平均値ともに老齢LF摂取群が老齢対照群に比して僅かに大きい値となっていた。
Observation on Average Lacrimal Gland Weight The average lacrimal gland weight in the control group (9 animals) of the old rats was 0.15 g, and the lacrimal gland weight average value in the LF intake group (9 animals) was 0.18 g. In addition, the ratio of the lacrimal gland to body weight in each individual was calculated, and the arithmetic average of the body weight ratio in each group was calculated. As a result, the average value of body weight ratio in the elderly control group was 0.045%, and the elderly LF was ingested. In the group it was 0.049%. In this experiment, no statistically significant difference was found between the two groups, but as described above, both the weight average value of the lacrimal gland and the average value of body weight ratio were slightly higher in the elderly LF intake group than in the old control group. It was a large value.
涙腺細胞内の構造に関する光学顕微鏡的所見
エポキシ樹脂包埋の準超薄切片にトルイジン青染色を施して観察を行った結果、老齢ラット対照群の涙腺細胞内は、ほぼ均一の大きさでトルイジン青に均質に染色される顆粒状構造物(記載の便宜上、この顆粒を「A顆粒」とする)によって占められている状態が多く認められた(図1;(a)は100倍、(b)は250倍)。また、それらの顆粒と同等ないしはやや大きい顆粒であってトルイジン青に淡染する明調顆粒も僅かに観察された。
Light microscopic observations on the structure of lacrimal gland cells Toluidine blue staining was performed on a semi-thin section of epoxy resin-embedded semi-thin sections. (FIG. 1; (a) is 100 times, (b). FIG. 1; (a) is 100 times larger). Is 250 times). In addition, a slight amount of light-colored granules that were equivalent to or slightly larger than those granules and lightly dyed toluidine blue were also observed.
老齢LF摂取群の涙腺細胞内には、老齢対照群で多く観察されるA顆粒もみられるが、中等度の大きさのトルイジン青に淡染する明調顆粒のほか、特に大型の明調顆粒が多数観察された(この種のトルイジン青に淡染する顆粒を「B顆粒」とする)(図2および3;図2(a)、(b)および図3(a)は100倍、図3(b)は250倍)。また、B顆粒は大きいものほど不規則な外形を示す傾向があった。さらに拡大して観察を行うと、B顆粒内部の染色性は、近傍にみられる導管内部を満たしている構造物の染色性と類似した状態が認められた(図2(b))。いずれにしても老齢LF摂取群においては、A顆粒やB顆粒のほか、種々の染色性と大きさを示す顆粒状構造物が多数混在しているのが特徴的であった。 In the lacrimal gland cells of the aged LF intake group, A granules, which are often observed in the aged control group, are also observed, but in addition to the light-colored granules that are lightly stained with medium-sized toluidine blue, particularly large light-colored granules are present. Many observed (granules that lightly dye this type of toluidine blue are referred to as “B granules”) (FIGS. 2 and 3; FIGS. 2 (a), (b) and 3 (a) are 100 times larger, FIG. (B) is 250 times). In addition, the larger the B granules, the more apt to show irregular shapes. When further observing, the stainability inside the B granule was found to be similar to the stainability of the structure filling the inside of the conduit seen in the vicinity (FIG. 2 (b)). In any case, in the aged LF intake group, in addition to A granules and B granules, a large number of granular structures having various staining properties and sizes are characteristically mixed.
若齢ラットにおける涙腺細胞内の顆粒状構造物の分布および形態は、老齢のLF摂取群と極めて類似した特徴を有していた(図4;(a)は100倍、(b)は250倍)。若齢ラットにおけるB顆粒の出現度を基準(++)として、老齢ラットの涙腺細胞内に認められるB顆粒の出現度を評価した結果を表1に示す。 The distribution and morphology of granular structures in lacrimal gland cells in young rats had characteristics very similar to those in the elderly LF intake group (FIG. 4; (a) was 100 times, (b) was 250 times. ). Table 1 shows the results of evaluating the degree of appearance of B granules found in lacrimal gland cells of old rats, using the degree of appearance of B granules in young rats as a reference (++).
* 若齢ラットにおけるB顆粒の出現度を基準(++)として、老齢ラットの各個体におけるB顆粒の出現状態を示す。(++)は若齢ラットにおけるB顆粒の出現度と同程度、(+++)はそれより高い出現度を示し、(+)はやや低く、(−)はかなり低い状態であることを示している。 * Appearance state of B granules in each individual of old rats is shown with reference to the degree of appearance of B granules in young rats (++). (++) is similar to the appearance of B granules in young rats, (++) is higher, (+) is slightly lower, (-) is much lower .
老齢対照群においても一部の個体(個体番号C−9)では、若齢ラットと同程度のB顆粒の出現度を示す個体も認められたが、他の個体は+ないし−となっており、A顆粒が主体をなしていることがわかる。一方、LF摂取老齢ラット群では、いずれの個体も++あるいは+++となっており、若齢ラットにおけるB顆粒の出現度と同等、あるいはそれ以上の結果を示している。 Even in the old age control group, some individuals (individual number C-9) showed the appearance of B granules at the same level as young rats, but other individuals were + or-. It can be seen that the A granule is the main component. On the other hand, in the LF-incorporated elderly rat group, all individuals are ++ or ++, and the results are equal to or higher than the appearance degree of B granules in young rats.
涙腺細胞内の構造に関する透過電子顕微鏡的所見
対照老齢ラットの涙腺細胞内にみられる顆粒の主体をなすA顆粒の内部は、電子密度がやや高く、ほぼ均一な大きさを示す微細粒子によって満たされていた(図5;(a)は2,900倍、(b)は5,800倍)。一方、LF摂取老齢ラットに多数認められる大型のB顆粒の内部には、電子密度の高い羽毛状の構造物とそれらの構造物の間に介在するコロイド状の物質が観察された(図6および図7(a);図6(a)は2,900倍、図6(b)は5,800倍、図7(a)は7,300倍)。また、これらの顆粒内にみられる羽毛状の構造物とコロイド状の物質は、その近傍の導管内にも認められた(図7(b);7,300倍)。中等度の大きさのB顆粒は、互いに融合して不規則な外形をした大型のB顆粒になると思われる像も観察された。
Transmission electron microscopic observation on the structure of lacrimal gland cells The inside of granule A, which is the main granule found in lacrimal gland cells of aged rats, is filled with fine particles with slightly higher electron density and almost uniform size. (FIG. 5; (a) is 2,900 times, (b) is 5,800 times). On the other hand, inside the large B granules observed in many LF-ingested aged rats, feather-like structures with high electron density and colloidal substances interposed between these structures were observed (FIG. 6 and FIG. 6). FIG. 7 (a); FIG. 6 (a) is 2,900 times, FIG. 6 (b) is 5,800 times, and FIG. 7 (a) is 7,300 times. Moreover, the feather-like structure and colloidal substance which are seen in these granules were recognized also in the nearby conduit (FIG. 7 (b); 7,300 times). An image was also observed in which moderately sized B granules fused to each other to form large B granules having an irregular shape.
ラクトフェリンを投与していない若齢ラットの涙腺細胞内にみられる顆粒の形態や顆粒内ならびに導管内の微細構造は、老齢LF摂取群のものと極めて類似した特徴を有していた(図8および図9;図8(a)は2,900倍、図8(b)、図9(a)および(b)は7,300倍)。 The granule morphology and intragranular and intraductal microstructure found in the lacrimal gland cells of young rats not administered lactoferrin had characteristics very similar to those in the aged LF intake group (Fig. 8 and FIG. 9: FIG. 8 (a) is 2,900 times, FIG. 8 (b), FIGS. 9 (a) and 9 (b) are 7,300 times).
本発明の医薬組成物を経口摂取した老齢ラット(LF摂取老齢ラット群)においては、これを投与しなかった老齢ラット(対照老齢ラット群)に比して、涙腺細胞内に種々の大きさや構造を有する顆粒が豊富に認められ、それらの顆粒が互いに融合して大型化していくと思われる状態も観察された。また、大型のB顆粒内にみられる構造物(顆粒内構造物)は、近傍の導管内に認められる構造物と形態的に極めて類似していることから、大型のB顆粒は導管に排出される段階に近い状態にまで成熟した分泌顆粒であると考えられる。 In the aged rat (LF-ingested aged rat group) orally ingested the pharmaceutical composition of the present invention, various sizes and structures in the lacrimal gland cells as compared to the aged rat (control aged rat group) that was not administered. There were also abundant granules having a size, and a state in which these granules seemed to be fused and enlarged was also observed. In addition, since the structure (intragranular structure) found in the large B granule is very similar in form to the structure found in the nearby conduit, the large B granule is discharged into the conduit. It is thought that it is a secretory granule that has matured to a state close to that stage.
以上の所見によって、比較的均一な大きさと構造を示す顆粒(A顆粒)によって占められている対照老齢ラットの涙腺細胞に比べて、ラクトフェリンを投与した老齢ラットにおいては、分泌顆粒が旺盛に形成されている可能性が示唆された。 Based on the above findings, secretory granules were actively formed in the aged rats administered with lactoferrin as compared to the lacrimal gland cells of the control aged rats occupied by granules (A granules) showing relatively uniform size and structure. The possibility is suggested.
すなわち、大型のB顆粒がラクトフェリンを投与した老齢ラットの涙腺細胞内において極めて豊富に観察されるのは、ラクトフェリンの投与により、涙腺細胞の分泌機能が亢進していることを示す形態的特徴であると考えられる。 That is, it is a morphological feature that the lacrimal gland cell secretion function is enhanced by the administration of lactoferrin that large B granules are observed in abundantly in the lacrimal gland cells of old rats administered with lactoferrin. it is conceivable that.
また、ラクトフェリンを投与していない若齢ラットの涙腺細胞における観察でも、ラクトフェリンを投与した老齢ラットとほぼ同様な所見が認められることから、LF摂取老齢ラット群にみられる構造的特徴は、ラクトフェリン投与の影響で生じた異常所見である可能性はないものと理解される。また、涙腺の重量平均値ならびに対体重比平均値ともに両群の間には統計学的有意差は認められなかったことから、ラクトフェリン投与が特に老齢ラットにおける涙腺の重量増加を促すように作用したのではなく、分泌機能の亢進に作用した可能性があると思われる。すなわち、加齢によって変性した組織の若返り活性をラクトフェリンが有することが確認された。 In addition, the observation in the lacrimal gland cells of young rats not administered lactoferrin shows almost the same findings as the old rats administered lactoferrin. It is understood that there is no possibility of abnormal findings caused by In addition, there was no statistically significant difference between the two groups in both the weight average value of the lacrimal gland and the mean value of body weight ratio, so lactoferrin administration acted to promote an increase in the weight of the lacrimal gland especially in aged rats It seems that it may have acted on the enhancement of secretory function. That is, it was confirmed that lactoferrin has the rejuvenation activity of tissues denatured by aging.
なお、通常のLF投与実験では、LFを2〜4%の割合で混和した飼料が多用されているが、本実験ではその1/10に相当する正味0.2〜0.4%のLFを投与したにも関わらず、LFの効果を認めることができた。これは、本実験で用いた医薬組成物が腸溶性製剤であることに起因する可能性も高い。本実験から腸溶性粉末ラクトフェリンの経口摂取により、老齢ラットにおける涙腺細胞の分泌機能が亢進すると思われる形態的特徴が認められた。 In a normal LF administration experiment, feed mixed with LF at a ratio of 2 to 4% is frequently used. In this experiment, a net 0.2 to 0.4% LF corresponding to 1/10 of the feed is used. Despite the administration, the effect of LF could be recognized. This is highly likely due to the fact that the pharmaceutical composition used in this experiment is an enteric preparation. From this experiment, morphological features that the ingestion of enteric powdered lactoferrin is thought to enhance the secretory function of lacrimal gland cells in aged rats were observed.
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