JP6218624B2 - 虚血性疾患を予防するための薬剤 - Google Patents
虚血性疾患を予防するための薬剤 Download PDFInfo
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- JP6218624B2 JP6218624B2 JP2014016118A JP2014016118A JP6218624B2 JP 6218624 B2 JP6218624 B2 JP 6218624B2 JP 2014016118 A JP2014016118 A JP 2014016118A JP 2014016118 A JP2014016118 A JP 2014016118A JP 6218624 B2 JP6218624 B2 JP 6218624B2
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- astaxanthin
- preventive agent
- retinal
- retinopathy
- carotenoid
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Description
従って、従来において、動脈硬化に起因した各種疾患を予防することが望まれている。
しかしながら、アスタキサンチン等のカロテノイドが虚血性網膜障害等の眼虚血症に対して保護効果を有することは知られていなかった。
(1)アスタキサンチンを主成分とするカロテノイド混合物を有効成分として含有する網膜障害予防剤。
(2)網膜障害が虚血性網膜障害である、(1)記載の網膜障害予防剤。
(3)アスタキサンチンを主成分とするカロテノイド混合物がパラコッカス属(Paracoccus)に属する微生物に由来するものである、(1)又は(2)記載の網膜障害予防剤。
(4)アスタキサンチンを主成分とするカロテノイド混合物が、該混合物全体の質量を基準として、30質量%〜70質量%のアスタキサンチン、4質量%〜22質量%のアドニルビン及び7質量%〜13質量%のアドニキサンチンを含む、(1)〜(3)のいずれか1記載の網膜障害予防剤。
(5)アスタキサンチンを主成分とするカロテノイド混合物の1日当たりの投与量が0.01〜400mg/kg体重となるように投与される、(1)〜(4)のいずれか1記載の網膜障害予防剤。
(6)糖尿病性網膜症、緑内障、眼高血圧及び眼虚血から成る群より選択される疾患を改善するための、(1)〜(5)のいずれか1記載の網膜障害予防剤。
(7)(1)〜(6)のいずれか1記載の網膜障害予防剤を含有する、医薬品、機能性食品、健康食品又は飲食品。
本発明に係る網膜障害予防剤は、アスタキサンチンを主成分とするカロテノイド混合物を有効成分として含有するものである。本発明に係る網膜障害予防剤をヒトに投与することで、副作用なく網膜障害(特に、虚血性網膜障害)から網膜を予防し、且つ保護することができる。従って、本発明に係る網膜障害予防剤は、網膜保護剤ということもできる。
(1)アスタキサンチンを主成分とするカロテノイド混合物の作製
特開2009-50237号公報に記載の方法に準じて、パラコッカス属(Paracoccus)に属する微生物の乾燥物から、90℃のエタノールで20分抽出して、カロテノイド溶出液を作製した。カロテノイド溶出液から65℃熱時濾過により、菌体残渣を除去した。濾液(抽出液)を、30℃に冷却し、缶温が30℃になるよう減圧度を調整し、液量1/5まで濃縮した。濃縮後、60℃で3時間加温して、シス体のアスタキサンチンをトランス体に再異性化後、さらに30℃で12時間熟成した。熟成後、濾過によりアスタキサンチンを主成分とするカロテノイド混合物を回収した。アスタキサンチンを主成分とするカロテノイド混合物は、真空下100℃で加熱乾燥させた。得られたアスタキサンチンを主成分とするカロテノイド混合物の組成を以下の表2に示す。また、以下では、得られたアスタキサンチンを主成分とするカロテノイド混合物を、「健食用アスタ」と称する。
OGISHIMA H. et al., Ligation of the Pterygopalatine and External Carotid Arteries Induces Ischemic Damage in the Murine Retina, Investigative Ophthalmology & Visual Science, 2011年, Vol. 52, No. 13, pp. 9710-9720に記載の方法に準じて、翼口蓋動脈(PPA)と外頸動脈(ECA)を結紮することで、眼虚血症モデルマウスを作製した。
図1に示すように、眼虚血症モデルマウスのPPA及びECAの結紮を行い、虚血5時間後に再灌流を行った。健食用アスタをオリーブ油に懸濁して100mg/kg体重となるように眼虚血症モデルマウスへ摂餌した。摂餌は、PPA/ECA結紮の1時間前、再灌流の直後、6時間後、12時間後、翌日から4日後まで1日2回の計12回経口投与した。
網膜電図は、光刺激に伴って生じる感覚網膜及び網膜色素上皮の電気的活動を眼底の広い範囲から集めて得られる電位である。a波(a-WAVE)は、眼球へのフラッシュ刺激後に1.5 msecの潜時で生じる角膜側陰性の電位変動であり、網膜表層(視細胞層)起源の電位と考えられる。臨床的に、a波の異常は眼動脈閉塞、網膜剥離等である。一方、b波(b-WAVE)は、a波の次に生じる大きな角膜陽性の電位変動であり、網膜のミューラー組織(中間層から内層)起源の電位と考えられる。臨床的に、b波の振幅が小さいことは網膜中心動脈の閉塞、先天網膜分離症、先天停在夜盲等が疑われる。
網膜電図測定後、眼球のパラフィン切片を作製してヘマトキシリン・エオジン染色により組織学的評価を行った。
(1)RGC-5細胞株
RGC-5細胞株は、ラット網膜神経節細胞由来の細胞株であり、細胞障害を評価するin vitro試験に用いられる。RGC-5細胞株は、NAKAJIMA Y. et al., Zeaxanthin, a Retinal Carotenoid, Protects Retinal Cells against Oxidative Stress, Current Eye Research, 2009年, Vol. 34, pp. 311-318に記載の方法に準じて培養することができる。
図4に示すように、血流が滞った状態を再現するため、OGDストレス下でRGC-5細胞株を培養した。ここで、OGDストレスとは、酸素とグルコースの供給を制限した状態のことである。
核染色は死細胞だけが染色(PI positive cells)される。
図5に示すように、健食用アスタを添加したRGC-5細胞は、溶媒(DMSO)を添加したRGC-5細胞に比較して、有意に死細胞数が少なく、健食用アスタを10μM添加した場合、医薬品であるEdaravoneと同程度の細胞保護作用があった。
また、OGDストレスを加えない場合は、健食用アスタ及びEdaravoneによる細胞死は見られなかった。
活性酸素(ROS)とは、普通の酸素分子よりも活性化された状態の酸素分子とその関連物質を指す。
Claims (7)
- アスタキサンチンを主成分とするカロテノイド混合物を有効成分として含有する網膜障害予防剤であって、前記カロテノイド混合物がアスタキサンチン、アドニルビン、アドニキサンチン、エキネノン、カンタキサンチン、アステロイデノン、3-ハイドロキシエキネノン及びβ-カロテンを含む、前記網膜障害予防剤。
- 網膜障害が虚血性網膜障害である、請求項1記載の網膜障害予防剤。
- アスタキサンチンを主成分とするカロテノイド混合物がパラコッカス属(Paracoccus)に属する微生物に由来するものである、請求項1又は2記載の網膜障害予防剤。
- アスタキサンチンを主成分とするカロテノイド混合物が、該混合物全体の質量を基準として、30質量%〜70質量%のアスタキサンチン、16質量%〜22質量%のアドニルビン及び7質量%〜13質量%のアドニキサンチンを含む、請求項1〜3のいずれか1項記載の網膜障害予防剤。
- アスタキサンチンを主成分とするカロテノイド混合物の1日当たりの投与量が0.01〜400mg/kg体重となるように投与される、請求項1〜4のいずれか1項記載の網膜障害予防剤。
- 糖尿病性網膜症、緑内障、眼高血圧及び眼虚血から成る群より選択される疾患を改善するための、請求項1〜5のいずれか1項記載の網膜障害予防剤。
- 請求項1〜6のいずれか1項記載の網膜障害予防剤を含有する、網膜障害を予防するための医薬品、機能性食品、健康食品又は飲食品。
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JP2014016118A JP6218624B2 (ja) | 2014-01-30 | 2014-01-30 | 虚血性疾患を予防するための薬剤 |
CA2938008A CA2938008A1 (en) | 2014-01-30 | 2014-10-22 | Medicine for preventing ischemic diseases |
EP14880497.4A EP3100724A4 (en) | 2014-01-30 | 2014-10-22 | Medicine for preventing ischemic diseases |
KR1020167020893A KR20160106632A (ko) | 2014-01-30 | 2014-10-22 | 허혈성 질환을 예방하기 위한 약제 |
US15/115,759 US20170007554A1 (en) | 2014-01-30 | 2014-10-22 | Medicine for preventing ischemic diseases |
CN201480074583.0A CN106102729B (zh) | 2014-01-30 | 2014-10-22 | 用于预防缺血性疾病的药物 |
PCT/JP2014/078677 WO2015114900A1 (ja) | 2014-01-30 | 2014-10-22 | 虚血性疾患を予防するための薬剤 |
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JP2019077664A (ja) * | 2017-10-27 | 2019-05-23 | Jxtgエネルギー株式会社 | カロテノイド組成物を含有する脳機能低下抑制剤または脳機能低下予防剤 |
WO2019172369A1 (ja) * | 2018-03-08 | 2019-09-12 | Jxtgエネルギー株式会社 | 出血性血管障害の予防または抑制のための組成物 |
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- 2014-10-22 US US15/115,759 patent/US20170007554A1/en not_active Abandoned
- 2014-10-22 CA CA2938008A patent/CA2938008A1/en not_active Abandoned
- 2014-10-22 CN CN201480074583.0A patent/CN106102729B/zh not_active Expired - Fee Related
- 2014-10-22 EP EP14880497.4A patent/EP3100724A4/en not_active Withdrawn
- 2014-10-22 KR KR1020167020893A patent/KR20160106632A/ko not_active Application Discontinuation
- 2014-10-22 WO PCT/JP2014/078677 patent/WO2015114900A1/ja active Application Filing
Also Published As
Publication number | Publication date |
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EP3100724A1 (en) | 2016-12-07 |
US20170007554A1 (en) | 2017-01-12 |
EP3100724A4 (en) | 2017-09-06 |
CN106102729A (zh) | 2016-11-09 |
JP2015140346A (ja) | 2015-08-03 |
CN106102729B (zh) | 2019-06-28 |
WO2015114900A1 (ja) | 2015-08-06 |
CA2938008A1 (en) | 2015-08-06 |
KR20160106632A (ko) | 2016-09-12 |
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