2004 Fiscal Year Final Research Report Summary
Investigation of the mechanism of diabetic macular edema
| Project/Area Number |
15591861
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Ophthalmology
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
HATA Yasuaki Kyushu University, Ophtalmology, Assistant Professor, 大学院・医学研究院, 講師 (90346776)
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| Co-Investigator(Kenkyū-buntansha) |
KADOWAKI Takashi Tokyo University, Internal Medicine, Professor, 大学院・医学系研究科, 教授 (30185889)
SUEISHI Katsuo Kyushu University, Pathology, Professor, 大学院・医学研究院, 教授 (70108710)
ISHIBASHI Tatsuro Kyushu University, Ophtalmology, Professor, 大学院・医学研究院, 教授 (30150428)
SONODA Koh-hei Kyushu University, Ophtalmology, Research Associate, 大学院・医学研究院, 助手 (10294943)
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| Project Period (FY) |
2003 – 2004
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| Keywords | VEGF / KDR / PPARgamma / Sp1 / Hyalocyte / PDGF / TGF-beta / Rho-kinase |
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| Research Abstract |
The main causes of visual disturbance due to diabetic retinppathy are macular edema based on vascular hyperpermeability and proliferative tissue based on the neovascularization. Vascular endothelial growth factor (VEGF=vascular permeability factor;VPF) is known to be closely associated with the pathogenesis of diabetic retinopathy.
We previously reported that the effect of VEGF was not only due to the amount of VEGF itself but also due to the amount of the expression of its receptor (KDR) on the surface of retinal capillary endothelial cells. Additionally, we reported that the expression of KDR gene is positively regulated by the transcription factor Sp1.
In this study, we clarified that PPARgamma agonist, which is already in clinical use as to normalize the insulin resistant state, could down-regulate the expression of KDR gene through the inhibition of the binding of Sp1 to the KDR promoter region. These result indicate that the PPARgamma agonist might be a hopeful drug for the treatme
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nt of diabetic retinopathy through not only normalizdng the insulin-resistent state but also down-regulating the expression of VEGF receptor on the retinal capillary endothelial cells.
In addition, while the mechanisms are still unclear, fractional force of the vitreous to the macular area is thought to be one of the pathogenesis of diabetic macular edema. We isolated hyalocytes, which are thought to be rnacrophage lineage, from the vitreous and examined its functional properties under various circumstances. Platelate-derived growth factor-BB(PDGF-BB), which is known to be up-regulated in the diabetic eyes, enhanced the proliferation, chamotaxis and gel contraction by the hyalocytes. Furthermore, TGF-beta, whose activity is also known to be up-regulated in the diabetic eyes, strongly promoted tonic and continuous gel contraction as compared with PDGF.
We further demonstrated that the gel contraction mechanism due to PDGF-BB and TGF-beta is mainly mediated through rho-kinase activity. We thus demonstrated that the rho-kinase inhibitor (Hydroxyfasudil), alredy in clinical use for cerebellar vascular spasm could inhibit the gel contraction by the hyalocyte. We thus indicated the possibility of new strategy for the treatment of diabetic retinopathy. Less
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[Journal Article] Comparison of diagnostic methods for diabetes mellitus based on prevalence of retinopathy in a Japanese population : the Hisayama Study.2004
Author(s)
Miyazaki M, Kubo M, Kiyohara Y, Okubo K, Nakamura H, Fujisawa K, Hata Y, Tokunaga S, Iida M, Nose Y, Ishibashi T.
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Journal Title
Diabetologia. 47
Pages: 1411-1415
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Incidence of acute endophthalmitis after triamcinolone-assisted pars plana vitrectomy.2004
Author(s)
Sakamoto T, Enaida H, Kubota T, Nakahara M, Yamakiri K, Yamashita T, Yokoyama M, Hata Y, Murata T, Miyata K, Uemura A, Kimura W, Ishibashi T.
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Journal Title
Am J Ophthalmol 138
Pages: 137-138
Description
「研究成果報告書概要(欧文)」より
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