RESUMO
We have investigated the effect of adiponectin (APN) peptide II on new vessel growth in mouse model of choroidal neovascularization (CNV) or wet type age-related macular degeneration (AMD). Mice were injected intraperitoneally with APN peptide II, control peptide, or PBS on day 1-7 or day 5-14. APN, AdipoR1, PCNA, and VEGF localization was investigated using confocal microscopy, immunohistochemistry, and RT-PCR. APN peptide II decreased the relative area of FITC-dextran perfused vessels by 4-fold, PCNA expression by 3-fold, and the number of PCNA stained HUVEC and MAVEC cells by 38 and 46%, respectively. We concluded that APN peptide II inhibits CNV size on days 7 and 14 by inhibiting the proliferation of endothelial cells in vivo and in vitro. APN peptide II may have therapeutic potential to inhibit CNV or wet AMD.
Assuntos
Adiponectina/uso terapêutico , Neovascularização de Coroide/tratamento farmacológico , Fragmentos de Peptídeos/uso terapêutico , Adiponectina/química , Sequência de Aminoácidos , Animais , Neovascularização de Coroide/etiologia , Neovascularização de Coroide/metabolismo , Células Endoteliais/metabolismo , Células Endoteliais/efeitos da radiação , Lasers , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Modelos Animais , Fragmentos de Peptídeos/química , Antígeno Nuclear de Célula em Proliferação/metabolismo , Antígeno Nuclear de Célula em Proliferação/fisiologia , Estrutura Terciária de Proteína , Receptores de Adiponectina/metabolismo , Receptores de Adiponectina/fisiologia , Fator A de Crescimento do Endotélio Vascular/metabolismo , Fator A de Crescimento do Endotélio Vascular/fisiologiaRESUMO
The aim of this study was to investigate the role of adiponectin (APN) in a mouse model of laser induced choroidal neovascularization (CNV). We have shown by immunohistochemistry that the expression of APN, adiponectin receptor 1, adiponectin receptor 2 and T cadherin gradually increased from day 1 to day 7 post-laser in laser treated mice compared to controls. Recombinant APN (rAPN) was injected intraperitoneally (i.p., 25 microg/mouse) or intravitreally (2 microg/eye) in lasered mice. Another set of lasered mice received APN peptide via i.p. (75 microg/mouse) or intravitreal (30 microg/eye) route. Control mice received a similar treatment with PBS, control protein or control peptide after laser treatment. We found that in the i.p. and intravitreal injection of rAPN resulted in 78% and 68% inhibition respectively in the size of CNV complex compared to control mice. Similar results were observed when APN peptide was injected intravitreally or i.p. Treatment with rAPN or the peptide resulted in decreased levels of vascular endothelial growth factor. Thus, APN inhibited choroidal angiogenesis and may have therapeutic implications in the treatment of wet age related macular degeneration.