JP4669396B2 - アンジオテンシン変換酵素阻害剤、医薬及び機能性食品 - Google Patents
アンジオテンシン変換酵素阻害剤、医薬及び機能性食品 Download PDFInfo
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- JP4669396B2 JP4669396B2 JP2005512525A JP2005512525A JP4669396B2 JP 4669396 B2 JP4669396 B2 JP 4669396B2 JP 2005512525 A JP2005512525 A JP 2005512525A JP 2005512525 A JP2005512525 A JP 2005512525A JP 4669396 B2 JP4669396 B2 JP 4669396B2
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Description
前記ACEは、生体内において前駆体であるアンジオテンシンIから血管収縮活性を有するアンジオテンシンIIに変換して血圧を上昇させる。このため、ACE阻害活性を有するペプチドは、ACEを阻害することで生体内においてアンジオテンシンIIの生産を抑えることから血圧降下作用を発揮することが期待されている。このようなACE阻害活性を有するペプチドについても、例えば、特許文献1〜3等に示されるとおり多数報告がなされている。
そこで、生体内での吸収効率及び分解抵抗性が高く、ACE阻害活性等の有用な機能を生体内で有効に発現しうるペプチドの開発が望まれている。
本発明の他の課題は、生体内において吸収され易く、且つ分解され難い生体内非分解性ペプチドを有効成分として含み、生体内において有効に血圧降下作用が期待できる医薬又は機能性食品を提供することにある。
更に本発明によれば、前記ACE阻害剤を含み、血圧降下作用を示す医薬又は機能性食品が提供される。
本発明のACE阻害剤は、前記生体内非分解性ペプチドを有効成分として含むので、生体内において有効にACE阻害活性が発現しうることが期待できる。
本発明の医薬及び機能性食品は、前記ACE阻害剤を含むので、生体内において、有効に血圧降下作用が得られることが期待できる。
本発明に用いる生体内非分解性ペプチドは、Ser Pro Proからなるカルボキシ末端にProを有するトリペプチドである。
ここで、生体内非分解性ペプチドとは、生体の腸管から吸収された際に、生体内ペプチダーゼ群に対して分解抵抗性が高い、カルボキシ末端にProを有するトリペプチドXaa Pro Proを意味する。
前記精製は、必ずしもトリペプチドを単離するまで行なう必要は無く、その濃度が高くなるように公知の精製法を適宜組合せて濃縮・精製すれば良い。
前記獣乳カゼインとしては、例えば、牛乳、馬乳、山羊乳、羊乳等のカゼインが挙げられ、特に牛乳カゼインが好ましく使用できる。
前記ペプチドの塩としては、薬学的に許容しうる塩等が好ましく、例えば、塩酸塩、硫酸塩、リン酸塩等の無機酸塩、酢酸塩、トリフルオロ酢酸塩、クエン酸塩、マレイン酸塩、フマル酸塩、乳酸塩、酒石酸塩等の有機酸塩が挙げられる。
本発明のACE阻害剤には、栄養的バランスや風味等を改善するために、各種補助添加剤を含有させることもできる。例えば、各種炭水化物、脂質、ビタミン類、ミネラル類、甘味料、香料、色素、テクスチュア改善剤等を含有させることができる。
このような医薬には、本発明のACE阻害剤の有効成分以外のACE阻害活性又は血圧降下作用を示すペプチド等の成分を含有させることもできる。
実施例1
牛乳由来カゼイン中に存在するXaa Pro及びXaa Prp Proと同一の配列を有するペプチドのうち、Ile Pro、Glu Pro、Arg Pro、Gln Pro、Met Pro及びSer Pro Proの各ペプチドを化学的に合成した((株)東レリサーチセンター製、純度95%以上)。これらペプチドを種々の濃度に溶解した溶液について以下に示す方法に従ってACE阻害活性を測定した。そして、ACE阻害率が50%になるペプチド濃度(μM)を求めIC50値とした。結果を表1に示す。
ウシ肺由来のACE(和光純薬株式会社製)を0.1UとなるようにpH8.3の0.1Mホウ酸緩衝液に溶解し、ACE溶液を調製した。表1に示す各ペプチド5mg/ml液を各ペプチドのIC50値に伴い適度に蒸留水で希釈した希釈溶液80μlと、300mMのNaClを含む5mMヒプリルヒスチジルロイシン(シグマ社製)200μlの溶液と、上記で調製したACE溶液20μlとを試験管に添加し、37℃で30分間反応させた。その後、1N塩酸(和光純薬社製)250μlを添加して反応を停止させた後、酢酸エチル(和光鈍薬社製)1.7mlを加え、撹拌後、酢酸エチル層1.4mlを試験管に採取し、120℃で約60分間蒸発乾燥させた。乾燥物に1mlの蒸留水を加えて、酢酸エチル中に抽出されたヒプリル酸の228nmでの吸光度を測定した。また、対照として、希釈溶液を添加しなかったもの、及び希釈溶液及びACE溶液を添加しなかったものについても吸光度を測定した。これらの吸光度からACE阻害活性を以下の式にて算出した。
ACE阻害活性(%)=[(A−B)/A]×100
A:(希釈溶液を添加せずにACE溶液を添加したものにおける吸光度)−(希釈溶液及びACE溶液を添加しなかったものにおける吸光度)
B:(希釈溶液及びACE溶液を添加したものにおける吸光度)−(希釈溶液を添加し、ACE溶液を添加しなかったものにおける吸光度)
<Xaa Pro、Xaa Pro Proの生体内消化吸収性及び分解抵抗性評価>
カゼイン中に存在するXaa Pro及びXaa Pro Pro配列を有するペプチドの生体内での消化吸収性及び分解抵抗性を確認するためにラットにおける経口投与後の血中移行性を以下のとおり試験した。
まず、6週齢のSDラット2匹に、Xaa Pro Proの例としてVal Pro Proを、またProを有さないジペプチドとしてGly Glyをそれぞれ500mg/匹で経口投与し、門脈からの経時的採血における各種ペプチドの血中移行性を測定した。結果を図1に示す。
図1より、Gly Glyは容易に生体内で分解を受けGlyが検出されたが、Val Pro Proは比較的安定に血液中に吸収されることが確認された。この結果より、Xaa Pro及びXaa Pro Pro配列のジペプチド及びトリペプチドは、生体内での消化吸収性及び分解抵抗性が高いものと推定できる。従って、本発明にかかるIle Pro、Glu Pro、Arg Pro、Gln Pro、Met Pro及びSer Pro Proも生体内での消化吸収性及び分解抵抗性が高いものと推定できる。
Claims (3)
- Ser Pro Proからなるカルボキシ末端にProを有する生体内非分解性ペプチド又はその塩を有効成分として含むアンジオテンシン変換酵素阻害剤。
- 請求項1記載のアンジオテンシン変換酵素阻害剤を含み、血圧降下作用を示す医薬。
- 請求項1記載のアンジオテンシン変換酵素阻害剤を含み、血圧降下作用を示す機能性食品。
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