JP3860849B2 - Anti-arteriosclerotic agent - Google Patents

Anti-arteriosclerotic agent Download PDF

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JP3860849B2
JP3860849B2 JP10450795A JP10450795A JP3860849B2 JP 3860849 B2 JP3860849 B2 JP 3860849B2 JP 10450795 A JP10450795 A JP 10450795A JP 10450795 A JP10450795 A JP 10450795A JP 3860849 B2 JP3860849 B2 JP 3860849B2
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Prior art keywords
arteriosclerosis
vitamin
group
present
calcium
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JPH08253415A (en
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ベルミール シーズ
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Eisai R&D Management Co Ltd
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Eisai R&D Management Co Ltd
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Description

【0001】
【産業上の利用分野】
本発明は、冠動脈硬化症、腹部大動脈硬化症、閉塞性動脈硬化症、腎動脈硬化症、頚動脈硬化症、眼底動脈硬化症、脳動脈硬化症等の動脈硬化の治療・改善剤に関する。
【0002】
【発明の背景】
循環器疾患は、血栓と動脈壁における硬化性変化が相互に影響し合って進展する。その速度は一般に遅く、徐々に動脈壁の肥厚が進み、局所的に動脈硬化が生成する。生成した動脈硬化は、さらに石灰化に進展する。したがって動脈壁の石灰化は、動脈硬化の終末像であり、その有効な治療方法は、いまだ見い出されていなかった。
【0003】
前述のように、動脈硬化症は徐々に進展するため、最初は自覚症状も発現せず、他覚所見も認められない。しかし、やがて病態の進展と共に、動悸・息切れ、四肢の冷感・痛み、一過性発作、むくみ等の症状が発現し、ついには心臓発作、脳出血、四肢の壊死、腎不全、歩行障害、知覚・運動障害等の重篤な病状を呈し、ついには死にも至る重篤な疾患である。日本国内では、死因統計の筆頭は癌に譲るものの、心疾患および脳疾患の大半は動脈硬化に起因することを考慮すると、動脈硬化症は死因として最も多いと言える。
【0004】
このように動脈硬化は体内多部位にわたり、かつ重篤あるいは予後不良な疾患であり、臨床上有用性の高い治療・改善薬が求められていた。
【0005】
【従来技術】
従来、動脈硬化症に対して直接有効な薬剤はなく、血清コレステロール低下剤(脂質低下剤)あるいは血小板凝集抑制剤(抗血栓剤)を投与して、間接的に動脈硬化の危険因子(リスク・ファクター)を取り除く療法のみであった。
【0006】
【本発明が解決しようとする問題点】
しかし、動脈硬化の危険因子は血清コレステロールや血栓に限らず、中性脂肪、肥満、糖尿病、高尿酸血症、免疫疾患、加齢、高血圧、ストレス、刺激物摂取、遺伝、性差、民族差など極めて多岐に亘っており、脂質低下剤や抗血栓剤の投与で全ての危険因子を取り除くことは、実際には不可能である。
【0007】
従って実際には、各種の動脈硬化症に対して直接的な治療・改善効果を有し、かつ安全性にも優れた薬剤がないのが現状であり、新規な医薬品の開発が強く望まれていた。
【0008】
【課題を解決するための手段】
本発明者は、ヒトを死にも至らす動脈硬化の研究に永年取り組み、また臨床上有用な動脈硬化症の治療・改善薬についても探索してきた。その結果、意外にも下記一般式で表されるメナテトレノン誘導体が、抗動脈硬化治療剤として所期の目的を達成できることを見い出し本発明を完成した。
【0009】
【化3】

Figure 0003860849
【0010】
従って本発明の目的は、従来臨床上有効な薬剤のなかった冠動脈硬化症、腹部大動脈硬化症、閉塞性動脈硬化症、腎動脈硬化症、頚動脈硬化症、眼底動脈硬化症、脳動脈硬化症等の各種動脈硬化症に対する臨床上の有用性が高く、かつ安全性に優れた、新規な治療・改善剤を提供することにある。さらに具体的には、メナテトレノン誘導体を有効成分とする、抗動脈硬化症治療剤に関する。
【0011】
ここで、本発明にかかるメナテトレノン誘導体は、下記一般式で表される。
【0012】
【化4】
Figure 0003860849
【0013】
式中、下記化学式で表される結合は、単結合(C-C)または二重結合(C=C)を意味する。
【0014】
【化5】
Figure 0003860849
【0015】
さらに、本発明にかかるメナテトレノン誘導体は、分子内に二重結合あるいは不斉炭素原子を有し、幾何異性体あるいは光学異性体が存在することがあるが、本発明においては限定されず、いずれか単一の異性体であってもよいし、2種類以上の混合物であってもよい。メナテトレノン誘導体としてさらに具体的には、例えば以下の化合物を挙げることができるが、本発明がこれらに限定されないことは言うまでもない。
(1) 2−メチル−3−[(2E,6E,10E)−3,7,11,15−テトラメチル−2,6,10,14−ヘキサデカテトラエニル]ナフトキノン、(一般名;ビタミンK2
(2) 2−メチル−3−[(2E)−3,7,11,15−テトラメチル−2−ヘキサデカエニル]ナフトキノン、(一般名;ビタミンK1
(3) 2−メチル−3−[(2Z,6E,10E)−3,7,11,15−テトラメチル−2,6,10,14−ヘキサデカテトラエニル]ナフトキノン、(一般名;シス−ビタミンK2
(4) 2−メチル−3−[(2Z)−3,7,11,15−テトラメチル−2−ヘキサデカエニル]ナフトキノン、(一般名;シス−ビタミンK1
【0016】
なお、本発明化合物は血液凝固系活性化作用を有する化合物として、既に新生児低プロトロンビン血症・分娩時出血・抗生物質投与中に起こる低プロトロンビン血症・胆道閉塞あるいは胆汁分泌不全による低プロトロンビン血症・クマリン系抗凝血薬投与中に起こる低プロトロンビン血症等に対して広く臨床使用されている化合物であり、長期間投与した際の安全性は確認されている。またマウス・ラット・イヌを用いた毒性試験においても、毒性が極めて低いことが確認されている。
【0017】
次に本発明にかかる代表化合物として、2−メチル−3−[(2E,6E,10E)−3,7,11,15−テトラメチル−2,6,10,14−ヘキサデカテトラエニル]ナフトキノン、(一般名;ビタミンK2)の急性毒性試験結果を示す。
【0018】
【急性毒性試験】
(方法)
7〜8週齢のSD系ラット、ICR系マウスおよびビーグル犬をそれぞれ雌雄各5匹用い、経口・皮下・腹腔内投与による単回投与毒性試験を実施した。(媒体;5%アラビアゴム)
【0019】
(結果)
LD50値(mg/Kg)を下表にまとめる。
【0020】
【表1】
Figure 0003860849
【0021】
表1から、本発明化合物のLD50値は高く、安全性が極めて高いことが明らかである。
【0022】
次に本発明化合物の投与剤型としては、例えば散剤、細粒剤、顆粒剤、錠剤、被覆錠剤、カプセル剤などの経口製剤、軟膏、貼付剤等の外用剤、坐剤および注射用製剤等が挙げられる。製剤化の際には、通常の製剤担体を用いて常法により製造することができる。
【0023】
すなわち経口製剤を製造するには、メナテトレノン誘導体と賦形剤、さらに必要に応じて酸化防止剤、結合剤、崩壊剤、滑沢剤、着色剤、矯味矯臭剤などを加えた後、常法により散剤、細粒剤、顆粒剤、錠剤、被覆錠剤、カプセル剤等とする。
【0024】
賦形剤としては、例えば乳糖、コーンスターチ、白糖、ブドウ糖、マンニトール、ソルビット、結晶セルロース、二酸化ケイ素などが、結合剤としては、例えばポリビニルアルコール、ポリビニルエーテル、メチルセルロース、エチルセルロース、アラビアゴム、トラガント、ゼラチン、シェラック、ヒドロキシプロピルメチルセルロース、ヒドロキシプロピルセルロース、ポリビニルピロリドン、ポリプロピレングリコール・ポリオキシエチレン・ブロックポリマー、メグルミンなどが、崩壊剤としては、例えば澱粉、寒天、ゼラチン末、結晶セルロース、炭酸カルシウム、炭酸水素ナトリウム、クエン酸カルシウム、デキストリン、ペクチン、カルボキシメチルセルロース・カルシウム等が、滑沢剤としては、例えばステアリン酸マグネシウム、タルク、ポリエチレングリコール、シリカ、硬化植物油等が、着色剤としては医薬品に添加することが許可されているものが、矯味矯臭剤としては、ココア末、ハッカ脳、芳香散、ハッカ油、竜脳、桂皮末等が用いられる。これらの錠剤・顆粒剤には糖衣、その他必要により適宜コーティングすることはもちろん差支えない。
【0025】
また注射用製剤を製造する際には、メナテトレノン誘導体にpH調整剤、溶解剤、等張化剤などと、必要に応じて溶解補助剤、安定化剤、酸化防止剤などを加えて、常法により製剤化する。
【0026】
外用剤を製造する際の方法は限定されず、常法により製造することができる。すなわち製剤化にあたり使用する基剤原料としては、医薬品、医薬部外品、化粧品等に通常使用される各種原料を用いることが可能である。
【0027】
使用する基剤原料として具体的には、例えば動植物油、鉱物油、エステル油、ワックス類、高級アルコール類、脂肪酸類、シリコン油、界面活性剤、リン脂質類、アルコール類、多価アルコール類、水溶性高分子類、粘土鉱物類、精製水などの原料が挙げられ、さらに必要に応じ、pH調整剤、酸化防止剤、キレート剤、防腐防黴剤、着色料、香料などを添加することができるが、本発明にかかる外用剤の基剤原料はこれらに限定されない。また必要に応じて血流促進剤、殺菌剤、消炎剤、細胞賦活剤、ビタミン類、アミノ酸、保湿剤、角質溶解剤等の成分を配合することもできる。なお上記基剤原料の添加量は、通常外用剤の製造にあたり設定される濃度になる量である。
【0028】
本発明におけるメナテトレノン誘導体の臨床投与量は、症状、重症度、年齢、合併症などによって異なり限定されず、また塩の種類・投与経路などによっても異なるが、通常成人1日あたり1mg〜2000mgであり、好ましくは10mg〜1500mgであり、さらに好ましくは50mg〜1000mgであり、これを経口、静脈内、筋肉内、経直腸または経皮投与する。
【0029】
【発明の効果】
次に本発明化合物の動脈硬化症治療・改善剤としての有用性を示すため、以下に効果例として薬理実験例を掲げるが、本発明化合物あるいは用途がこれらに限定されないことは言うまでもない。
【0030】
本発明化合物の代表例として、2−メチル−3−[(2E,6E,10E)−3,7,11,15−テトラメチル−2,6,10,14−ヘキサデカテトラエニル]ナフトキノン、(一般名;ビタミンK2)を評価対象・被験化合物とした。
【0031】
実験1 閉経後の婦人における腹部大動脈硬化とビタミン K 2 摂取量の評価
(方法)
(1) 大動脈硬化の評価
60〜79才の婦人を対象に無作為抽出し、lumbara spine (T12-S1) の lateral X線撮影で、腹部大動脈における石灰化の有無を、専門家2名がブラインドで判定した。これらの石灰化は内膜での粥状動脈硬化の存在を示す。
【0032】
(2) ビタミンK2摂取量の評価
毎日のビタミンK2摂取量は、ビタミンK2を多く含有する素材に重点をおいた食事内容調査を行い、摂取した食物中のビタミンK2含有量を各種栄養表に基づいて決定した。
【0033】
(結果)
動脈硬化の有無とビタミンK2摂取量(平均±標準誤差、μg/日)との関係を、年齢層別に表2および図1に示した。これらから、ビタミンK2の摂取量が少ない群では、動脈硬化の発生頻度が統計的にも有意に高いことが明らかである。
【0034】
【表2】
Figure 0003860849
【0035】
実験2 動脈硬化ラットモデルにおけるビタミン K 2 の効果
(方法)
7週齢雄性SDラットを下表のように7群に分け、A群にはビタミンD2を、B群にはビタミンD2とビタミンK2(低用量)を、C群にはビタミンD2とビタミンK2(高用量)を、それぞれ投与した。
【0036】
【表3】
Figure 0003860849
【0037】
5週間飼育後、各群の20時間尿を採取し、尿中カルシウム、リンおよびクレアチニン濃度を測定した。
また、6週間飼育後、各群とも脱血死させ、血液、大動脈(弓部から胸部)と腎臓を採取した。
血液からは血清を分離し、血清カルシウムおよびリン濃度を測定した。
大動脈および腎臓は脱脂・脱水・灰化し、カルシウムおよびリン含量を測定した。
【0038】
なお、カルシウム濃度の測定は原子吸光法により、無機リン濃度の測定はゴールデンバーグ(Goldenberg)法により、クレアチニンは酵素法により、それぞれ測定した。
【0039】
(結果)
測定結果を下表に示す。(対照群に対する各群の結果をt-検定にて比較検定した)
【0040】
【表4】
Figure 0003860849
【0041】
表4から明らかなように、ビタミンD2を投与したA群では、大動脈中のカルシウムおよびリン含量が有意に増加し動脈硬化が生成したが、ビタミンK2(低用量)を投与したB群、さらにビタミンK2(高用量)を投与したC群では、用量依存的に。動脈のカルシウムおよびリン含量の増加が抑制され、特にC群においては有意な差が認められた。
【0042】
腎臓のカルシウムおよびリン含量も有意に増加し腎動脈硬化が生成したが、ビタミンK2(低用量)を投与したB群、さらにビタミンK2(高用量)を投与したC群では、大動脈と同様用量依存的に、腎臓のカルシウムおよびリン含量の増加抑制が認められた。
【0043】
一方、血清中のカルシウムおよびリン濃度、および尿中のカルシウム、リンおよびクレアチニン濃度には、各群間において差は認められなかった。
【0044】
実験3 コレステロール負荷ウサギモデルにおけるビタミン K 2 の効果
(方法)
4ヶ月齢ニュージーランド・ホワイト(NZW)系雄性ウサギ(体重、2.5-2.8Kg)60匹を、ウサギ固形飼料RM-4(船橋農場製)で1ヶ月飼育した後、コレステロールを0.5%負荷したRM-4で3日間飼育した(100g/匹/日)。耳介動脈から採血して血清総コレステロール値(以下、TC値)を測定し、値が極端に高い個体あるいは極端に低い個体を除外して、40匹を選んだ。TC値の平均および分散が各群間で均等になるように、一群8匹の計5群(A〜E群)に分けた。
【0045】
これらのウサギをすべてコレステロール無添加のRM-4で3週間飼育した後、下表に従って、被験化合物(ビタミンK2)添加あるいは無添加のRM-4で10週間飼育した(100g/匹/日)。
【0046】
【表5】
Figure 0003860849
【0047】
表6および図2に、各群における、投与開始前、1、2、4、6、8および10週後のTC値を平均±標準誤差で示す。
【0048】
【表6】
Figure 0003860849
【0049】
表6および図2から、0.5%コレステロール負荷群では、対照群と比較して、TC値が経時的に増加しているのに対し、本発明化合物であるビタミンK2を同時に投与したC〜E群では、TC値の増加が有意に抑制されたことが明らかである。[0.5%コレステロール負荷群(B群)に対するC〜E各群の結果を、対応のあるt-検定にて比較検定した]
【0050】
以上の結果から、ビタミンK2を代表とするメナテトレノン誘導体が各部位における動脈硬化と密接な関連があり、かつ抑制効果を有し、さらに血清コレステロール低下作用をも有していることが明らかであり、またこれらメナテトレノン誘導体の安全性の高さも併せて考えると、本発明にかかるメナテトレノン誘導体は、抗動脈硬化剤として臨床上極めて優れた有用性を期待できることが明らかである。
【0051】
【図面の簡単な説明】
【図1】 閉経後の婦人における、腹部大動脈硬化の有無とビタミンK2摂取量との関係を、年齢層別に示した図である。(平均±標準誤差で示す)
【図2】 コレステロール負荷ウサギモデルにおける、ビタミンK2の血清総コレステロール増加抑制効果を示した図である。(平均±標準誤差で示す)[0001]
[Industrial application fields]
The present invention relates to a therapeutic / ameliorating agent for arteriosclerosis such as coronary arteriosclerosis, abdominal aortic sclerosis, obstructive arteriosclerosis, renal arteriosclerosis, carotid arteriosclerosis, fundus arteriosclerosis, cerebral arteriosclerosis and the like.
[0002]
BACKGROUND OF THE INVENTION
Cardiovascular disease progresses with sclerotic changes in the thrombus and arterial wall interacting with each other. The rate is generally slow, gradually thickening of the arterial wall, and arteriosclerosis is generated locally. The generated arteriosclerosis further progresses to calcification. Therefore, calcification of the arterial wall is a terminal image of arteriosclerosis, and an effective treatment method has not yet been found.
[0003]
As described above, arteriosclerosis progresses gradually, so that initially no subjective symptoms appear and no objective findings are observed. However, over time, symptoms such as palpitation / shortness of breath, sensation of cold / pain in limbs, transient seizures, swelling, etc. developed, and finally heart attack, cerebral hemorrhage, extremity necrosis, renal failure, gait disturbance, perception・ Severe illnesses such as movement disorders and eventually death. In Japan, the leading cause of death statistics is left to cancer, but considering that most heart and brain diseases are caused by arteriosclerosis, arteriosclerosis is the most common cause of death.
[0004]
As described above, arteriosclerosis is a disease that has multiple sites in the body and has a serious or poor prognosis, and a therapeutic / ameliorating drug with high clinical usefulness has been demanded.
[0005]
[Prior art]
Conventionally, there are no drugs that are directly effective against arteriosclerosis. Serum cholesterol-lowering agents (lipid-lowering agents) or platelet aggregation inhibitors (antithrombotic agents) are administered indirectly to risk factors (risk / risk) Only therapy to remove the factor).
[0006]
[Problems to be solved by the present invention]
However, risk factors for arteriosclerosis are not limited to serum cholesterol and blood clots, but include neutral fat, obesity, diabetes, hyperuricemia, immune diseases, aging, high blood pressure, stress, stimulant intake, genetics, gender differences, ethnic differences, etc. It is so diverse that it is practically impossible to remove all risk factors by the administration of lipid lowering agents and antithrombotic agents.
[0007]
Therefore, in reality, there is no drug that has a direct therapeutic / ameliorating effect on various arteriosclerosis and has excellent safety, and the development of a new drug is strongly desired. It was.
[0008]
[Means for Solving the Problems]
The present inventor has been engaged in research on arteriosclerosis that causes human death, and has also been searching for clinically useful therapeutic / ameliorating agents for arteriosclerosis. As a result, the present inventors have unexpectedly found that a menatetrenone derivative represented by the following general formula can achieve its intended purpose as an anti-atherosclerotic therapeutic agent.
[0009]
[Chemical 3]
Figure 0003860849
[0010]
Therefore, the purpose of the present invention is to coronary arteriosclerosis, abdominal aortic sclerosis, obstructive arteriosclerosis, renal arteriosclerosis, carotid arteriosclerosis, fundus arteriosclerosis, cerebral arteriosclerosis, etc. It is to provide a novel therapeutic / ameliorating agent having high clinical usefulness for various arteriosclerosis and excellent safety. More specifically, the present invention relates to an anti-arteriosclerosis therapeutic agent comprising a menatetrenone derivative as an active ingredient.
[0011]
Here, the menatetrenone derivative according to the present invention is represented by the following general formula.
[0012]
[Formula 4]
Figure 0003860849
[0013]
In the formula, a bond represented by the following chemical formula means a single bond (CC) or a double bond (C = C).
[0014]
[Chemical formula 5]
Figure 0003860849
[0015]
Furthermore, the menatetrenone derivative according to the present invention has a double bond or an asymmetric carbon atom in the molecule and may have a geometric isomer or an optical isomer, but is not limited in the present invention. It may be a single isomer or a mixture of two or more. More specific examples of the menatetrenone derivative include the following compounds, but it goes without saying that the present invention is not limited to these compounds.
(1) 2-methyl-3-[(2E, 6E, 10E) -3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraenyl] naphthoquinone (generic name; vitamin K 2 )
(2) 2-methyl-3-[(2E) -3,7,11,15-tetramethyl-2-hexadecenyl] naphthoquinone, (generic name; vitamin K 1 )
(3) 2-methyl-3-[(2Z, 6E, 10E) -3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraenyl] naphthoquinone (generic name; cis- Vitamin K 2 )
(4) 2-Methyl-3-[(2Z) -3,7,11,15-tetramethyl-2-hexadecenyl] naphthoquinone (generic name; cis-vitamin K 1 )
[0016]
The compound of the present invention is a compound having a blood coagulation system activation action, and has already been hypoprothrombinemia due to neonatal hypoprothrombinemia, hemorrhage during labor, hypoprothrombinemia, biliary obstruction, or biliary secretion failure. -It is a compound that is widely used for hypoprothrombinemia, etc. that occurs during the administration of coumarin anticoagulants and has been confirmed to be safe after long-term administration. In toxicity tests using mice, rats, and dogs, it has been confirmed that toxicity is extremely low.
[0017]
Next, as a representative compound according to the present invention, 2-methyl-3-[(2E, 6E, 10E) -3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraenyl] naphthoquinone , (Generic name; vitamin K 2 ) acute toxicity test results are shown.
[0018]
[Acute toxicity test]
(Method)
Single-dose toxicity studies were conducted by oral, subcutaneous, and intraperitoneal administration using 5 male and 7 female SD rats, 7-week-old SD rats, ICR mice and beagle dogs. (Medium; 5% gum arabic)
[0019]
(result)
The LD 50 values (mg / Kg) are summarized in the table below.
[0020]
[Table 1]
Figure 0003860849
[0021]
From Table 1, it is clear that the LD 50 value of the compound of the present invention is high and the safety is extremely high.
[0022]
Next, examples of the dosage form of the compound of the present invention include oral preparations such as powders, fine granules, granules, tablets, coated tablets, capsules, external preparations such as ointments and patches, suppositories, and injection preparations. Is mentioned. At the time of formulation, it can be produced by a conventional method using an ordinary formulation carrier.
[0023]
That is, in order to produce an oral preparation, after adding menatetrenone derivative and excipient, and further, if necessary, an antioxidant, a binder, a disintegrant, a lubricant, a coloring agent, a flavoring agent, etc. Powders, fine granules, granules, tablets, coated tablets, capsules, etc.
[0024]
Examples of the excipient include lactose, corn starch, sucrose, glucose, mannitol, sorbitol, crystalline cellulose, silicon dioxide, and the like, and examples of the binder include polyvinyl alcohol, polyvinyl ether, methyl cellulose, ethyl cellulose, gum arabic, tragacanth, gelatin, Shellac, hydroxypropylmethylcellulose, hydroxypropylcellulose, polyvinylpyrrolidone, polypropylene glycol polyoxyethylene block polymer, meglumine, etc., as disintegrants, for example, starch, agar, gelatin powder, crystalline cellulose, calcium carbonate, sodium bicarbonate, Examples of lubricants include calcium citrate, dextrin, pectin, carboxymethylcellulose and calcium, etc. Um, talc, polyethylene glycol, silica, hydrogenated vegetable oil, etc. are permitted to be added to pharmaceuticals as coloring agents, but as flavoring agents, cocoa powder, mint brain, aroma powder, mint oil, dragon brain , Cinnamon powder and the like are used. Of course, these tablets and granules may be appropriately coated with sugar coating or other necessary.
[0025]
When manufacturing injectable preparations, add a pH adjuster, a solubilizer, an isotonic agent, etc. to the menatetrenone derivative and, if necessary, a solubilizing agent, a stabilizer, an antioxidant, etc. To make a formulation.
[0026]
The method for producing the external preparation is not limited and can be produced by a conventional method. That is, as a base material used for formulation, various raw materials usually used for pharmaceuticals, quasi drugs, cosmetics, and the like can be used.
[0027]
Specific examples of base materials to be used include animal and vegetable oils, mineral oils, ester oils, waxes, higher alcohols, fatty acids, silicone oils, surfactants, phospholipids, alcohols, polyhydric alcohols, Examples include raw materials such as water-soluble polymers, clay minerals, and purified water, and if necessary, pH adjusters, antioxidants, chelating agents, antiseptic / antifungal agents, coloring agents, fragrances, etc. may be added. However, the base material of the external preparation according to the present invention is not limited thereto. In addition, components such as blood flow promoters, bactericides, anti-inflammatory agents, cell activators, vitamins, amino acids, humectants, keratolytic agents, and the like can be blended as necessary. In addition, the addition amount of the said base raw material is an amount used as the density | concentration normally set in manufacture of an external preparation.
[0028]
The clinical dose of menatetrenone derivative in the present invention is not limited and varies depending on symptoms, severity, age, complications, etc., and varies depending on the type of salt and administration route, but is usually 1 mg to 2000 mg per day for an adult. The dose is preferably 10 mg to 1500 mg, more preferably 50 mg to 1000 mg, which is administered orally, intravenously, intramuscularly, rectally or transdermally.
[0029]
【The invention's effect】
Next, in order to show the usefulness of the compound of the present invention as a therapeutic / ameliorating agent for arteriosclerosis, examples of pharmacological experiments will be given below as examples of effects.
[0030]
As a representative example of the compound of the present invention, 2-methyl-3-[(2E, 6E, 10E) -3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraenyl] naphthoquinone, ( Generic name: Vitamin K 2 ) was the subject of evaluation and test compound.
[0031]
Experiment 1 Evaluation of abdominal aortic stiffness and vitamin K 2 intake in postmenopausal women (method)
(1) Evaluation of aortic stiffness
Randomized sampling was performed on women aged 60 to 79 years, and two experts blindly determined the presence or absence of calcification in the abdominal aorta by a lateral X-ray of lumbara spine (T12-S1). These calcifications indicate the presence of atherosclerosis in the intima.
[0032]
(2) vitamin K 2 intake of daily evaluation of vitamin K 2 intake, performs a diet survey with emphasis on materials containing a large amount of vitamin K 2, ingested various types of vitamin K 2 content in food Determined based on nutrition table.
[0033]
(result)
The relationship between the presence or absence of arteriosclerosis and vitamin K 2 intake (mean ± standard error, μg / day) is shown in Table 2 and FIG. 1 for each age group. These, in the group is small intake of vitamin K 2, it is clear that the frequency of occurrence of arteriosclerosis significantly higher statistically.
[0034]
[Table 2]
Figure 0003860849
[0035]
The effect of vitamin K 2 in Experiment 2 arteriosclerosis rat model (Method)
Seven-week-old male SD rats are divided into 7 groups as shown in the table below. Group A contains vitamin D 2 , group B contains vitamin D 2 and vitamin K 2 (low dose), and group C contains vitamin D 2. And vitamin K 2 (high dose) were administered respectively.
[0036]
[Table 3]
Figure 0003860849
[0037]
After 5 weeks of breeding, 20-hour urine was collected from each group, and urinary calcium, phosphorus and creatinine concentrations were measured.
In addition, after breeding for 6 weeks, each group was exsanguinated and blood, aorta (from arch to chest) and kidney were collected.
Serum was separated from blood and serum calcium and phosphorus concentrations were measured.
The aorta and kidneys were defatted, dehydrated, and ashed, and calcium and phosphorus contents were measured.
[0038]
The calcium concentration was measured by the atomic absorption method, the inorganic phosphorus concentration was measured by the Goldenberg method, and creatinine was measured by the enzyme method.
[0039]
(result)
The measurement results are shown in the table below. (The results of each group compared to the control group were compared by t-test)
[0040]
[Table 4]
Figure 0003860849
[0041]
As is apparent from Table 4, in group A administered vitamin D 2 , calcium and phosphorus contents in the aorta were significantly increased and arteriosclerosis was produced, but group B administered vitamin K 2 (low dose), Furthermore, in group C to which vitamin K 2 (high dose) was administered, dose-dependently. An increase in arterial calcium and phosphorus content was suppressed, and a significant difference was observed particularly in group C.
[0042]
Renal calcium and phosphorus contents also increased significantly and renal arteriosclerosis was produced, but in group B administered vitamin K 2 (low dose) and in group C administered vitamin K 2 (high dose), the same as in the aorta In a dose-dependent manner, an increase in renal calcium and phosphorus content was suppressed.
[0043]
On the other hand, there was no difference between the groups in serum calcium and phosphorus concentrations and urine calcium, phosphorus and creatinine concentrations.
[0044]
Experiment 3 Effect of vitamin K 2 in cholesterol-loaded rabbit model (method)
RM- loaded with 0.5% cholesterol after breeding 60 rabbits of 4 months old New Zealand White (NZW) male (weight, 2.5-2.8Kg) for 1 month with rabbit solid feed RM-4 (Funabashi Farm) The animals were raised at 4 for 3 days (100 g / animal / day). Blood was collected from the auricular artery and the serum total cholesterol level (hereinafter referred to as TC level) was measured. 40 individuals were selected, excluding individuals with extremely high or extremely low values. The group was divided into a total of 5 groups (A to E groups) with 8 animals per group so that the mean and variance of TC values were uniform among the groups.
[0045]
All of these rabbits were bred for 3 weeks in RM-4 without cholesterol, and then bred for 10 weeks in RM-4 with or without the test compound (vitamin K 2 ) according to the table below (100 g / animal / day). .
[0046]
[Table 5]
Figure 0003860849
[0047]
In Table 6 and FIG. 2, the TC values before the start of administration, 1, 2, 4, 6, 8, and 10 weeks after administration in each group are shown as mean ± standard error.
[0048]
[Table 6]
Figure 0003860849
[0049]
From Table 6 and FIG. 2, in the 0.5% cholesterol load group, the TC value increased with time as compared with the control group, whereas the vitamin C 2 which is the compound of the present invention was administered at the same time. It is clear that the increase in TC value was significantly suppressed in the group. [Results of each of the groups C to E with respect to the 0.5% cholesterol load group (group B) were subjected to a comparative t-test for comparison]
[0050]
From the above results, it is clear that menatetrenone derivatives represented by vitamin K 2 are closely related to arteriosclerosis at each site, have an inhibitory effect, and also have a serum cholesterol lowering effect. In view of the high safety of these menatetrenone derivatives, it is clear that the menatetrenone derivative according to the present invention can be expected to have extremely excellent clinical usefulness as an anti-arteriosclerotic agent.
[0051]
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between the presence or absence of abdominal aortic sclerosis and vitamin K 2 intake in postmenopausal women by age group. (Average ± standard error)
In Figure 2 cholesterol diet rabbit model, illustrates the serum total cholesterol increase inhibition effects of vitamin K 2. (Average ± standard error)

Claims (2)

ビタミンK 2 を有効成分とする抗動脈硬化治療剤。Anti-atherosclerotic therapeutic agent containing vitamin K 2 as an active ingredient. 動脈硬化が冠動脈硬化症、腹部大動脈硬化症、閉塞性動脈硬化症、腎動脈硬化症、頚動 脈硬化症、眼底動脈硬化症、脳動脈硬化症から選ばれた1種以上である請求項1記載の 抗動脈硬化治療剤。  The arteriosclerosis is at least one selected from coronary arteriosclerosis, abdominal aortic sclerosis, obstructive arteriosclerosis, renal arteriosclerosis, carotid atherosclerosis, fundus arteriosclerosis, and cerebral arteriosclerosis. The anti-atherosclerotic therapeutic agent as described.
JP10450795A 1994-04-28 1995-04-28 Anti-arteriosclerotic agent Expired - Lifetime JP3860849B2 (en)

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JP11168494 1994-04-28
JP7-6049 1995-01-18
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JP6-111684 1995-01-18
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