JPWO2005094838A1 - 高血糖改善のための医薬及び飲食品 - Google Patents
高血糖改善のための医薬及び飲食品 Download PDFInfo
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Abstract
Description
従来、先行技術文献には、血糖値の上昇を抑制する効果を有するものとして、例えば、バナバに由来する成分を含む血糖値上昇抑制剤(特許文献1)、麦類発酵物の濃縮エキスを有効成分とする血糖値上昇抑制剤(特許文献2)等が開示されている。
また、ラノスタン骨格、又は3,4−セコラノスタン骨格を有する化合物によるインスリン作用増強活性(特許文献7)では、膵臓における疾患に対する効果は不明であるものの、その効果は脂肪細胞の分化調節におけるインスリンの作用を増強させるものとして開示されている。
さらに、ステロイド基本骨格の部分に2重結合を含まない24−アルキルコレステン−3オン及び24−アルキルコレスタン−3オンからなる群から選ばれる化合物が血糖降下剤として開示されている(特許文献8)。
また、前記医薬又は飲食品は、前記R1が、下記式のいずれかで表されることを好ましい態様としている。
前記医薬又は飲食品は、前記植物がユリ科植物であることが好ましく、前記ユリ科植物がアロエ属に分類される植物であることを特に好ましい態様としている。
以下、上記医薬又は飲食品を、総称して「本発明の医薬又は飲食品」ということがある。
[図2]本発明の化合物を投与したマウスの空腹時血糖値の経時的変化を示す図。
前記R1は、下記式で表される基のいずれかであることが好ましい。
前記化合物として最も好ましい化合物は、下記式で表される4−メチルコレスト−7−エン−3−オール(式(2))、4−メチルエルゴスト−7−エン−3−オール(式(3))、及び4−メチルスチグマスト−7−エン−3−オール(式(4))である。
得られたフラクションは、さらにHPLC等により精製することができる。
アロエベラの葉肉(透明ゲル部分)100kgを、ホモジナイザーを用いて液状化し、ここに100リットルの酢酸エチル/ブタノール混合液(3:1)を添加して攪拌した。
本試験は、本発明の化合物のヘモグロビンA1cの低下作用および高血糖状態の改善効果を評価するために行った。
前記製造例1で製造した化合物3(4−メチルコレスト−7−エン−3−オール)、化合物4(4−メチルエルゴスト−7−エン−3−オール)、化合物5(4−メチルスチグマスト−7−エン−3−オール)をそれぞれ試験試料1、2、3とした。
II型糖尿病モデルマウスとして、6週齢、雄性db/dbマウス(日本クレア社より購入)を使用した。当該マウスを1群7匹に群分けした。各試験試料をDMSOに溶解した後、生理食塩水にて、それぞれ1μg/mlに調整した。最終DMSO濃度は、0.2%に調整した。尚、試験試料を含まない溶液を陰性試料とした。当該II型糖尿病モデルマウスに、1日1回ゾンデを用いて各試験試料溶液を1mlずつ、40日間連続経口投与した。また、対照試料1としてβ−シトステロール(タマ生化学社製)を、それぞれモデルマウスに投与した。空腹時血糖値および、通常血糖値は、アントセンスII(バイエル三共社製)にて経時的に測定した。空腹時血糖値は、15時間の絶食の後に測定を行った。また、投与開始から35日目に、ヘモグロビンA1cをDCA2000(バイエル三共社製)にて測定した。
図1および図2に、通常血糖値および、空腹時血糖値の試験試料投与期間中の経時的変化を示す。陰性試料及び、対照試料1を投与したマウスでは、通常血糖値及び空腹時血糖値のいずれにおいても急激な血糖値の上昇が観察されたが、試験試料1、2、3をそれぞれ連続投与したマウスにおいては、いずれにおいても明らかに血糖値の上昇を抑制する効果が観察された。
本試験は、本発明の化合物のヘモグロビンA1cの低下作用を臨床現場で用いられている糖尿病薬とともに評価するために行った。
前記製造例1で製造した化合物3(4−メチルコレスト−7−エン−3−オール)、化合物4(4−メチルエルゴスト−7−エン−3−オール)、化合物5(4−メチルスチグマスト−7−エン−3−オール)をそれぞれ試験試料1、2、3とした。
II型糖尿病モデルマウスとして、6週齢、雄性db/dbマウス(日本クレア社より購入)を使用した。当該マウスを1群7匹に群分けした。各試験試料をDMSOに溶解した後、生理食塩水にて、それぞれ1μg/mlに調整した。最終DMSO濃度は、0.2%に調整した。尚、試験試料を含まない溶液を陰性試料とした。また、対照試料2として、アクトス錠(武田薬品工業株式会社)を乳鉢にて磨りつぶし、生理食塩水に溶解して有効成分である塩酸ピオグリタゾンが7.5μg/mlになるよう調整した。当該II型糖尿病モデルマウスに、1日1回ゾンデを用いて各試験試料溶液、及び対照試料2溶液、陰性試料溶液をそれぞれ1mlずつ、22日間連続経口投与した。投与開始から23日目に、ヘモグロビンA1cをDCA2000(バイエル三共社製)にて測定した。
投与開始から23日目のヘモグロビンA1cの測定結果を表2に示す。陰性試料を投与したときのヘモグロビンA1cの値に比べ、試験試料1及び試験試料2のいずれにおいても、約11%の統計学的に有意な低下がみられた。これに比べて対照試料2では、0.8%程度の低下しか見られず、統計学的にも有意な効果は得られなかった。また、投与期間中、投与後ともに、低血糖状態を引き起こした例は一度もなく、体重および病理的な所見からも副作用は全くみられなかった。
本試験は、アロエベラ由来の、本発明の化合物を含む粗精製物2のヘモグロビンA1cの低下作用を測定するために行った。
前記製造例1で製造した粗精製物2(フラクションA)を試験試料4として用い、フラクションB及びCを、それぞれ対照試料3及び4として用いた。
II型糖尿病モデルマウスとして、6週齢、雄性db/dbマウス(日本クレア社より購入)を使用した。当該マウスを1群7匹に群分けした。試験試料4、並びに対照試料3及び4をDMSOにて溶解した後、生理食塩水にて1μg/mlに調整した。最終DMSO濃度は0.2%に調整した。尚、試験試料を含まない溶液を陰性試料とした。当該II型糖尿病モデルマウスに、1日1回ゾンデを用いて、試料溶液4、対照試料3及び4、陰性試料をそれぞれ1mlずつ、40日間連続経口投与した。投与開始から35日目にヘモグロビンA1cをDCA2000(バイエル三共社製)にて測定した。
投与開始から35日目のヘモグロビンA1cの測定結果を表3に示す。陰性試料を投与したときのヘモグロビンA1cの値に比べ、試験試料4の連続投与では、15%という顕著な低下がみられた。これに比べて対照試料3及び4では、0.4から0.6%程度の低下しか見られず、殆どヘモグロビンA1cの低下効果は見られなかった。また、投与期間中、投与後ともに、低血糖状態を引き起こした例は一度もなく、体重および病理的な所見からも副作用は全くみられなかった。
10質量%含む高血糖改善のための医薬、又は前記化合物を乾燥質量で0.0001〜1質量%含む飲食品をそれぞれ提供する。
前記医薬又は飲食品は、前記植物がユリ科植物であることが好ましく、前記ユリ科植物がアロエ属に分類される植物であることを特に好ましい態様としている。
前記医薬は、前記植物がユリ科植物であることが好ましく、前記ユリ科植物がアロエ属に分類される植物であることを特に好ましい態様としている。
本発明はまた、4−メチルコレスト−7−エン−3−オール、4−メチルエルゴスト−7−エン−3−オール、及び4−メチルスチグマスト−7−エン−3−オールからなる群から選ばれる1種又は2種以上の化合物を含む植物の有機溶媒抽出物もしくは熱水抽出物又はこれらの分画物を含み、前記化合物を乾燥質量で0.0001〜1質量%含む、飲食品を提供する。
7−エン−3−オール、及び4−メチルスチグマスト−7−エン−3−オールからなる群から選ばれる1種又は2種以上の化合物を含む組成物を有効成分として配合する、高血糖改善のための医薬の製造方法を提供する。
Claims (21)
- 前記R2及びR3の一方が水素原子であり、他方がメチル基であり、R4が水酸基である、請求項1に記載の医薬。
- 前記化合物が、4−メチルコレスト−7−エン−3−オール、4−メチルエルゴスト−7−エン−3−オール、及び4−メチルスチグマスト−7−エン−3−オールからなる群から選ばれる、請求項3に記載の医薬。
- 前記化合物を乾燥質量で0.001〜10質量%含む請求項1〜4のいずれか一項に記載の医薬。
- 前記植物がユリ科植物である、請求項6に記載の医薬。
- 前記ユリ科植物がアロエ属に分類される植物である、請求項7に記載の医薬。
- 前記R2及びR3の一方が水素原子であり、他方がメチル基であり、R4が水酸基である、請求項9に記載の飲食品。
- 前記化合物が、4−メチルコレスト−7−エン−3−オール、4−メチルエルゴスト−7−エン−3−オール、及び4−メチルスチグマスト−7−エン−3−オールからなる群から選ばれる、請求項11に記載の飲食品。
- 前記化合物を乾燥質量で0.0001〜1質量%含む請求項9〜12のいずれか一項に記載の飲食品。
- 前記植物がユリ科植物である、請求項14に記載の飲食品。
- 前記ユリ科植物がアロエ属に分類される植物である、請求項15に記載の飲食品。
- 高血糖改善作用を有するものであることを特徴とし、高血糖改善のために用いられる旨の表示を付した、請求項9〜16のいずれか一項に記載の飲食品。
- 前記組成物が、前記化合物を乾燥質量で0.001〜10質量%以上含む、請求項18に記載の使用。
- 前記組成物が、前記化合物を乾燥質量で0.001〜10質量%以上含む、請求項20に記載の方法。
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CA2548811C (en) | 2010-02-23 |
US20070032463A1 (en) | 2007-02-08 |
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KR100998858B1 (ko) | 2010-12-08 |
US7754704B2 (en) | 2010-07-13 |
EP1731158B1 (en) | 2014-10-08 |
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