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Circ Res. 2000 Sep 15;87(6):448-52.

Antiangiogenic effect of interleukin-10 in ischemia-induced angiogenesis in mice hindlimb.

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  • 1INSERM U541, Hôpital Lariboisière, Institut Fédératif de Recherche "Circulation, Paris 7", Paris, France.

Abstract

Ischemia induces both hypoxia and inflammation that trigger angiogenesis. The inflammatory reaction is modulated by production of anti-inflammatory cytokines. This study examined the potential role of a major anti-inflammatory cytokine, interleukin (IL)-10, on angiogenesis in a model of surgically induced hindlimb ischemia. Ischemia was produced by artery femoral occlusion in both C57BL/6J IL-10(+/+) and IL-10(-/-) mice. After 28 days, angiogenesis was quantified by microangiography, capillary, and arteriole density measurement and laser Doppler perfusion imaging. The protein levels of IL-10 and vascular endothelial growth factor (VEGF) were determined by Western blot analysis in hindlimbs. IL-10 was markedly expressed in the ischemic hindlimb of IL-10(+/+) mice. Angiogenesis in the ischemic hindlimb was significantly increased in IL-10(-/-) compared with IL-10(+/+) mice. Indeed, angiographic data showed that vessel density in the ischemic leg was 10.2+/-0.1% and 5.7+/-0.4% in IL-10(-/-) and IL-10(+/+) mice, respectively (P:<0.01). This corresponded to improved ischemic/nonischemic leg perfusion ratio by 1.4-fold in IL-10(-/-) mice compared with IL-10(+/+) mice (0.87+/-0. 05 versus 0.63+/-0.01, respectively; P:<0.01). Revascularization was associated with a 1.8-fold increase in tissue VEGF protein level in IL-10(-/-) mice compared with IL-10(+/+) mice (P:<0.01). In vivo electrotransfer of murine IL-10 cDNA in IL-10(-/-) mice significantly inhibited both the angiogenic process and the rise in VEGF protein level observed in IL-10(-/-) mice. No changes in vessel density or VEGF content were observed in the nonischemic hindlimb. These findings underscore the antiangiogenic effect of IL-10 associated with the downregulation of VEGF expression and suggest a role for the inflammatory balance in the modulation of ischemia-induced angiogenesis.

PMID:
10988235
[PubMed - indexed for MEDLINE]
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