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Am J Pathol. 2014 Jul;184(7):1981-90. doi: 10.1016/j.ajpath.2014.03.017. Epub 2014 May 15.

MFG-E8 regulates angiogenesis in cutaneous wound healing.

Author information

1
Department of Dermatology, Gunma University Graduate School of Medicine, Maebashi, Japan.
2
Dermatology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland.
3
Department of Dermatology, Gunma University Graduate School of Medicine, Maebashi, Japan. Electronic address: smotegi@gunma-u.ac.jp.

Abstract

Our research group recently demonstrated that pericytes are major sources of the secreted glycoprotein and integrin ligand lactadherin (MFG-E8) in B16 melanoma tumors, and that MFG-E8 promotes angiogenesis via enhanced PDGF-PDGFRβ signaling mediated by integrin-growth factor receptor crosstalk. However, sources of MFG-E8 and its possible roles in skin physiology are not well characterized. The objective of this study was to characterize the involvement of MFG-E8 in skin wound healing. In the dermis of normal murine and human skin, accumulations of MFG-E8 were found around CD31(+) blood vessels, and MFG-E8 colocalized with PDGFRβ(+), αSMA(+), and NG2(+) pericytes. MFG-E8 protein and mRNA levels were elevated in the dermis during full-thickness wound healing in mice. MFG-E8 was diffusely present in granulation tissue and was localized around blood vessels. Wound healing was delayed in MFG-E8 knockout mice, compared with the wild type, and myofibroblast and vessel numbers in wound areas were significantly reduced in knockout mice. Inhibition of MFG-E8 production with siRNA attenuated the formation of capillary-like structures in vitro. Expression of MFG-E8 in fibrous human granulation tissue with scant blood vessels was less than that in granulation tissue with many blood vessels. These findings suggest that MFG-E8 promotes cutaneous wound healing by enhancing angiogenesis.

PMID:
24838098
PMCID:
PMC4076467
DOI:
10.1016/j.ajpath.2014.03.017
[Indexed for MEDLINE]
Free PMC Article

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