JP5505298B2 - Helicobacter pyloriの生育阻害剤およびその製造方法 - Google Patents
Helicobacter pyloriの生育阻害剤およびその製造方法 Download PDFInfo
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- JP5505298B2 JP5505298B2 JP2010505728A JP2010505728A JP5505298B2 JP 5505298 B2 JP5505298 B2 JP 5505298B2 JP 2010505728 A JP2010505728 A JP 2010505728A JP 2010505728 A JP2010505728 A JP 2010505728A JP 5505298 B2 JP5505298 B2 JP 5505298B2
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- lactic acid
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Description
本発明は、特定の植物乳酸菌の培養上清中に抗ピロリ活性が存在することを見出したことに基づいて完成された。「抗ピロリ活性」は、ピロリ菌(Helicobacter pylori)の生育を阻害する活性が意図され、具体的にはピロリ菌を殺傷する活性、ピロリ菌の増殖を抑制/阻害する活性が意図される。
本発明は、ラクトバシラス プランタルムSN35M株、SN35N株、SN13T株およびSN26T株からなる群より選択される植物乳酸菌の生菌を生存可能に含有している組成物を提供する。本発明に係る組成物を用いれば、Helicobacter pyloriの生育阻害剤を製造することができる。
本発明は、Helicobacter pyloriの生育阻害剤を提供する。本発明に係る生育阻害剤には、上述した植物乳酸菌の培養上清またはその培養上清の抽出物を含んでいることを特徴としている。
本発明は、カテコールの製造方法を提供する。本発明に係るカテコールの製造方法は、上記植物乳酸菌の培養上清を得る工程を包含し、好ましくは、培養上清のエステル抽出物またはクロロホルム抽出物を得る工程をさらに包含し得る。また、本発明に係るカテコールの製造方法は、培養培地に酒粕もしくは焼酎蒸留残渣またはこれらの抽出物を添加することをさらに含んでもよい。このように、本発明に係るカテコールの製造方法は、上述したHelicobacter pyloriの生育阻害剤の製造方法であり得ることを、当業者は容易に理解し得る。
本発明は、チロソールの製造方法を提供する。本発明に係るチロソールの製造方法は、上記植物乳酸菌の培養上清を得る工程を包含し、好ましくは、培養上清のエステル抽出物またはクロロホルム抽出物を得る工程をさらに包含し得る。また、本発明に係るチロソールの製造方法は、培養培地に酒粕もしくは焼酎蒸留残渣またはこれらの抽出物を添加することをさらに含んでもよい。このように、本発明に係るチロソールの製造方法は、上述したHelicobacter pyloriの生育阻害剤の製造方法であり得ることを、当業者は容易に理解し得る。
後述する実施例において示すように、ブルーベリー果汁またはザクロ果汁は、植物乳酸菌による醗酵を経ることなく、Helicobacter pyloriの生育を阻害し得る。すなわち、本発明は、ブルーベリー果汁またはザクロ果汁の新規用途を提供する。
乳酸菌として、Lb.plantarum SN13T株(受託番号:NITE BP−7;以下「SN13T株」とも称する。)およびLb.plantarum SN35N株(受託番号:NITE BP−6;以下「SN35N株」とも称する。)を、実験に用いた。SN13T株は、タイのナムという醗酵ソーセージ(豚肉のミンチを熱帯植物の葉、例えば、バナナの葉で包み、醗酵させたもの)から分離され、特徴としては、多糖類を産生しない。SN35N株は、果物(ナシ)から分離され、SN13T株と比較して増殖力が強く、多糖類を多量に産生する。さらに、Lb.plantarum SN35N株が多糖類を産生することから、SN35N株に適当な濃度の抗生物質を添加することによってSN35N株を変異処理して、多糖類非生産性変異株として菌体外多糖類生合成遺伝子(exogenous polysaccharide−encoding gene)を欠損させた変異株(eps欠損変異株)を作製して実験に供した。
ピロリ菌(約1×108個)の懸濁液と乳酸菌培養上清とを、容積比8:2または6:4で混合し、37℃、微好気条件下にて穏やかに振盪培養した。ピロリ菌懸濁液と乳酸菌培養上清との混合時、混合3時間後、6時間後、24時間後に混合液中のウレアーゼ活性を測定した。ウレアーゼ活性の測定には、尿素とフェノールレッドなどで構成されるウレア培地を用いた。これは、混合培養液中のピロリ菌がウレアーゼを産生していれば、ウレア培地中の尿素がアンモニアに分解され、産生されたアンモニアによってpHが上昇すると、指示薬であるフェノールレッドがピンク色になることを利用している。なお、ピロリ菌の活性が低下すると、ウレアーゼ活性が低下し、尿素からアンモニアが産生されず、吸光度は低下する。このようなウレアーゼ活性の低下を指標に抗ピロリ活性を測定した。
寒天拡散法によって抗ピロリ活性を確認した。ピロリ菌(約1×108個)の懸濁液を塗布した寒天培地上に、乳酸菌培養上清20μLを浸透させたペーパーディスクを配置し、37℃で72時間培養した後に、形成された阻止円を観察した(図2)。乳酸溶液を用いた寒天拡散法による抗菌活性のアッセイの結果を(a)に示す。右が500mM、1.0M、1.5Mの乳酸溶液である。左は、所定濃度の乳酸溶液のpHを7以上にしたものである。乳酸溶液では乳酸の濃度の上昇とともに、阻止円直径が大きくなっており、ピロリ菌の発育を阻害していることが明らかである。しかし、乳酸溶液のpHを7以上にすると、全く阻止円が観察されなかった。このように、乳酸には、その酸としての性質以外にはピロリ菌の発育を阻害する要因はないことが確認された。
上述したように、モモ果汁培地を用いてSN13T株を培養した際に得られる培養上清が最も強い抗ピロリ活性を示した。この培養上清を、各種有機溶媒を用いて分画した後に、寒天拡散法によるバイオアッセイに供した。培養上清50mLをヘキサン(200mL)で2回抽出して有機相1を回収した。次いで、ヘキサン抽出後の水相をクロロホルム(200mL)で2回抽出して有機相2を回収した。続いて、クロロホルム抽出後の水相を酢酸エチル(200mL)で2回抽出して有機相3を回収した。有機相1〜3を上述したようにペーパーディスクに浸透させて、寒天拡散法によって抗ピロリ活性を調べた。図3に示すように、有機相3(酢酸エチル相)に大きな阻止円が観察され、抗ピロリ活性物質は主に酢酸エチル相に存在することが分かった。
モモ果汁を用いてSN13T株を培養した際に得られる培養上清(以下、醗酵液と称する。)における抗ピロリ活性の活性物質の同定を試みた。
フェノール類の一種であるカテコールは、ポリフェノール、カテコールアミン(アドレナリン、ノルアドレナリン、ドパミン)などの生体物質の骨格に含まれる構造として知られている。また、カテコールは、コーヒーや香辛料、オリーブオイル等に多く含まれていることも知られている。さらに、抗酸化作用を有し、染料の原料や止血剤として用いられる。
Claims (7)
- ラクトバシラス プランタルムSN13T株(受託番号:NITE BP−7)の、ナシ果汁またはモモ果汁を培地として用いた培養によって得られる培養上清、または該培養上清からの抽出物を含有しており、
上記培養上清、または該培養上清からの抽出物が、抗ピロリ活性の活性物質としてカテコールまたはチロソールを含有している、ヘリコバクター ピロリ(Helicobacter pylori)の生育阻害剤。 - 上記抽出物がエステル抽出物であることを特徴とする請求項1に記載の生育阻害剤。
- ブルーベリー果汁またはザクロ果汁をさらに含有していることを特徴とする請求項1または2に記載の生育阻害剤。
- 請求項1に記載の生育阻害剤を製造する方法であって、
ラクトバシラス プランタルムSN13T株(受託番号:NITE BP−7)の、ナシ果汁またはモモ果汁を培地として用いた培養後の培養上清を得る工程、ならびに
上記培養上清にカテコールまたはチロソールが含まれるか否かを確認する工程
を包含することを特徴とする製造方法。 - 上記培養上清のエステル抽出物を得る工程をさらに包含することを特徴とする請求項4に記載の製造方法。
- 上記培地に酒粕もしくは焼酎蒸留残渣またはこれらの抽出物を添加することをさらに含むことを特徴とする請求項4または5に記載の製造方法。
- ブルーベリー果汁またはザクロ果汁を上記培養上清に添加する工程をさらに包含することを特徴とする請求項4〜6のいずれか1項に記載の製造方法。
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