JP6316391B2 - レチノイン酸様剤 - Google Patents
レチノイン酸様剤 Download PDFInfo
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- JP6316391B2 JP6316391B2 JP2016235844A JP2016235844A JP6316391B2 JP 6316391 B2 JP6316391 B2 JP 6316391B2 JP 2016235844 A JP2016235844 A JP 2016235844A JP 2016235844 A JP2016235844 A JP 2016235844A JP 6316391 B2 JP6316391 B2 JP 6316391B2
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Description
RAR及びRXRには3つのサブタイプ(α、β、γ)が存在し、皮膚では主としてRARγとRXRαが発現していることが知られている(非特許文献1、2)。
このようなことから、皮膚においてRARγを活性化し、レチノイン酸様作用を発揮できれば、皮膚の創傷治癒促進に有効であると考えられる。
しかしながら、これら植物とレチノイン酸様活性との関係については知られていない。
斯かる植物は、そのまま又は乾燥・粉砕等して用いることができる。また、上記部位は、そのまま抽出工程に付されてもよく、又は粉砕、切断若しくは乾燥された後に抽出工程に付されてもよい。該抽出物は天然成分由来であり安全性も高い。
抽出物の酸化を防止するため、煮沸脱気や窒素ガス等の不活性ガスを通気して溶存酸素を除去しつつ、いわゆる非酸化的雰囲気下で抽出する手段を併用してもよい。
また、植物の抽出物は市販品を使用することもできる。
当該評価系は、リガンドのLBDへの結合、すなわちRARγの活性化を、リガンドがLBDに結合する際に発生するルシフェラーゼ活性を指標として判別することにより、レチノイン酸様活性の評価を可能にしたものである。
そして、本発明の植物又はそれらの抽出物は、RARγに結合し、これを活性化することが有用と考えられる各種症状の改善に有効であると考えられる。例えば、本発明の植物又はそれらの抽出物は、皮膚の創傷治癒促進に有効であると考えられる。
このような種々の剤型の医薬製剤を調製するには、本発明の植物及びそれらの抽出物からなる群より選択される少なくとも1種を単独で、又は他の薬学的に許容される賦形剤、結合剤、増量剤、崩壊剤、界面活性剤、滑沢剤、分散剤、緩衝剤、保存剤、嬌味剤、香料、被膜剤、担体、希釈剤等を適宜組み合わせて用いることができる。
種々の形態の食品を調製するには、本発明の植物及びそれらの抽出物からなる群より選択される少なくとも1種を単独で、又は他の食品材料や、溶剤、軟化剤、油、乳化剤、防腐剤、香科、安定剤、着色剤、酸化防止剤、保湿剤、増粘剤等を適宜組み合わせて用いることができる。当該食品中の本発明の植物又はそれらの抽出物の含有量(抽出物の乾燥物換算)は、一般的に0.01〜100質量%とするのが好ましく、0.1〜100質量%とするのがより好ましく、更に好ましくは1〜100質量%とするのが好ましい。
尚、飼料を製造する場合には、本発明の植物及びそれらの抽出物からなる群より選択される少なくとも1種の他に、牛、豚、羊等の肉類、蛋白質、穀物類、ぬか類、粕類、糖類、野菜、ビタミン類、ミネラル類等一般に用いられる飼料原料、更に一般的に飼料に使用されるゲル化剤、保型剤、pH調整剤、調味料、防腐剤、栄養補強剤等を組み合わせて用いることができる。
また、飼料中の、本発明の植物又はそれらの抽出物の含有量は、その使用形態により異なるが、乾燥物換算で、通常0.0001〜20質量%であり、0.001〜10質量%が好ましく、0.01〜5質量%がより好ましい。
<植物抽出物の調製>
(製造例1)オジギソウ(Mimosa pudica L.)抽出物の調製
オジギソウを基原植物とする生薬含羞草140gを細切し、50(v/v)%エタノール1800mLを加え、85℃で2回抽出(1回目:2時間、2回目:1時間)した後に濾過し、溶媒を除き、固形分16.0gを得た。固形分を蒸発残分1.0(w/v)%となるよう希釈し、オジギソウ抽出物を調製した。
イノモトソウを基原植物とする生薬ホウビソウ100gを細切し、50(v/v)%エタノール2000mLを加え、85℃で2回抽出(1回目:2時間、2回目:1時間)した後に濾過し、溶媒を除き、固形分7.1gを得た。固形分を蒸発残分1.0(w/v)%となるよう希釈し、イノモトソウ抽出物を調製した。
pBIND−RARγ及びpGL4.35[luc2P/9XGAL4UAS/Hygro]はPromega社より購入した。
1)pBIND−RARγの作成
先ず、ヒトの皮膚組織由来のcDNAを鋳型として、PvuIとEcoRIの制限酵素サイトを含む、表1に示すプライマーを利用して、RARγのLBDを含む領域をPCRにより増幅した。
ヒト腎臓由来細胞株であるHEK293は、10% Fetal Bovine Serum(FBS)を含むDMEM中で培養を行った(37℃、5% CO2)。
HEK293を96−well plateに3.0×104 cells/wellの細胞密度になるよう播種した。その12時間後に培養液(5%チャコール処理FBSを含むフェノールレッド不含DMEM)を交換し、pBIND−RARγとpGL4.35[luc2P/9XGAL4UAS/Hygro]を、Lipofectamine 2000(Invitrogen社)を用いて、製品添付のプロトコールに従い細胞に導入した。導入から24時間後に、コントロール溶媒(0.1% Dimethyl sulfoxideを含む培養液)、陽性対照であるadapalene(Tocris Bioscience社)(終濃度10nM)、上記製造例1〜2で調製した植物抽出物(終濃度0.1、0.5又は1(v/v)%)をそれぞれ含む培養液と置換し、さらに24時間培養を行った(n=6)。
ホタルルシフェラーゼ(RARγのLBD結合活性の指標)及びウミシイタケルシフェラーゼ(plasmid導入効率の指標)の活性測定には、Dual GloTM Luciferase Assay System(Promega社)を用い、添付のプロトコールに従い実施した。ホタルルシフェラーゼの活性を、ウミシイタケルシフェラーゼの活性で除し、補正した値を相対的発光強度(RLU:Relative Luminescence Unit)とした。
それぞれの活性値は、陽性対照におけるRLUを100とした場合の相対値として示した。結合活性作用の評価は陰性対照であるコントロール溶媒を添加した際の結合活性値と比較して行った。
結果を表2に示す。HEK293細胞からの蛍光強度を測定したところ、上記植物抽出物を培養液に添加した細胞群では、その蛍光強度がコントロール溶媒を添加した群に比べ増加していた。実施例にて測定した蛍光は、RARγのLBDへの結合能を反映していることから、上記2抽出物にレチノイン酸様の活性があることが確認された。
Claims (1)
- イノモトソウ(Pteris multifida Poir.)及びその抽出物からなる群より選択される少なくとも1種を有効成分とする創傷治癒用レチノイン酸様剤。
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