Research Project
Grant-in-Aid for Scientific Research (C)
In this study, we clarified that Ephedra Herb extract, EHE, promotes the downregulation of c-Met by facilitating clathrin-mediated endocytosis and lysosomal degradation of c-Met. EHE may a novel type of cancer therapeutics, because no drugs, that promotes the downregulation of growth factor receptors, have been developed.Furthermore, we investigated the effect of EHE on transcytosis, one of the mechanisms of high molecular mass drug absorption. Because endocytosis is a first step of transcytosis. The permeability of a transcytosis marker protein, horseradish peroxidase (HRP), to monolayer culture of Caco-2 cells was evaluated after treatment of EHE. The rate of permeability of HRP was increased depending on the concentration of EHE. Therefore, it is possible that the active ingredients, high molecular mass condensed tannins, in EHE are absorbed by transcytosis.
これまで、がん治療のために増殖因子受容体のリン酸化阻害剤の開発が行われてきたが、分解系を促進して過剰発現した受容体をダウンレギュレーションするような医薬品は開発されていない。c-Met過剰発現は、がんの増殖や転移を促進するだけなく、分子標的治療薬に対する耐性の原因にもなっていることから、EHEはc-Met過剰発現がんに対する新しいタイプの治療薬になる可能性が高い。さらに、最近、EHEの活性成分として高分子縮合型タンニンを見出した。これまで高分子タンニンは吸収されないと考えられていたが、トランスサイトーシスによって生体内に吸収されている可能性があることがわかった。
All 2020 2019 2018 2017 Other
All Journal Article (12 results) (of which Peer Reviewed: 11 results, Open Access: 7 results) Presentation (19 results) (of which Int'l Joint Research: 1 results, Invited: 6 results) Remarks (1 results) Patent(Industrial Property Rights) (4 results) (of which Overseas: 2 results)
Chemical and Pharmaceutical Bulletin
Volume: 68 Issue: 2 Pages: 140-149
10.1248/cpb.c19-00761
130007793436
Evidence-Based Complementary and Alternative Medicine
Volume: 2020 Issue: 1 Pages: 1-14
10.1155/2020/7184129
YAKUGAKU ZASSHI
Volume: 139 Issue: 11 Pages: 1417-1425
10.1248/yakushi.19-00122
130007740052
Biological and Pharmaceutical Bulletin
Volume: 42 Issue: 9 Pages: 1538-1544
10.1248/bpb.b19-00260
130007700082
別冊BIO Clinica
Volume: 8 Pages: 118-122
Journal of Natural Medicines
Volume: 72(1) Issue: 1 Pages: 73-29
10.1007/s11418-017-1111-8
40021456031
Volume: 41 Issue: 2 Pages: 247-253
10.1248/bpb.b17-00803
130006329267
薬局
Volume: 70 Pages: 278-285
Volume: 2018 Issue: 1 Pages: 1-8
10.1155/2018/4625358
J Nat Med
Volume: 71 Issue: 1 Pages: 105-113
10.1007/s11418-016-1034-9
40021062576
Volume: 137 Issue: 2 Pages: 179-186
10.1248/yakushi.16-00233-4
130005305784
漢方と最新治療
Volume: 26 Pages: 267-274
https://www.kitasato-u.ac.jp/toui-ken/research/rin_research.html