Abstract:
:Leptin, a circulating hormone secreted mainly from adipose tissues, is involved in the control of body weight. Recently, leptin was found to be an angiogenic factor, and its vitreous levels are associated with angiogenic eye diseases such as proliferative diabetic retinopathy. However, the molecular mechanism for leptin-elicited angiogenesis remains to be elucidated. Pigment epithelium-derived factor (PEDF) has been shown to be the most potent natural inhibitor of angiogenesis in the mammalian eye, and its levels in the vitreous were decreased in angiogenic eye diseases. In this study, we investigated whether and how PEDF could inhibit the leptin-induced DNA synthesis in microvascular endothelial cells (EC), a key step of angiogenesis. Leptin significantly increased intracellular reactive oxygen species (ROS) generation in microvascular EC. PEDF was found to inhibit the leptin-induced ROS generation in EC. An anti-oxidant, N-acetylcysteine, or PEDF completely prevented the leptin-induced upregulation of vascular endothelial growth factor (VEGF) mRNA levels as well as any increase in DNA synthesis in microvascular EC. Polyclonal antibodies against human VEGF were also found to completely inhibit DNA synthesis in leptin-exposed EC. The present study suggests that leptin could elicit angiogenesis through autocrine VEGF production via intracellular ROS generation. PEDF may block the angiogenic effects of leptin through its anti-oxidative properties.
journal_name
Microvasc Resjournal_title
Microvascular researchauthors
Yamagishi S,Amano S,Inagaki Y,Okamoto T,Takeuchi M,Inoue Hdoi
10.1016/s0026-2862(03)00005-0keywords:
subject
Has Abstractpub_date
2003-05-01 00:00:00pages
186-90issue
3eissn
0026-2862issn
1095-9319pii
S0026286203000050journal_volume
65pub_type
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journal_title:Microvascular research
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journal_title:Microvascular research
pub_type: 杂志文章
doi:10.1006/mvre.1997.2015
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pub_type: 杂志文章
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pub_type: 杂志文章,随机对照试验
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journal_title:Microvascular research
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doi:10.1006/mvre.1995.1033
更新日期:1995-07-01 00:00:00
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journal_title:Microvascular research
pub_type: 杂志文章
doi:10.1006/mvre.2002.2437
更新日期:2002-09-01 00:00:00
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pub_type: 杂志文章
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journal_title:Microvascular research
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journal_title:Microvascular research
pub_type: 杂志文章
doi:10.1006/mvre.1998.2086
更新日期:1998-07-01 00:00:00