MFG-E8 regulates angiogenesis in cutaneous wound healing

Akihiko Uchiyama, Kazuya Yamada, Sachiko Ogino, Yoko Yokoyama, Yuko Takeuchi, Mark C. Udey, Osamu Ishikawa, Sei Ichiro Motegi

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

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.

Original languageEnglish
Pages (from-to)1981-1990
Number of pages10
JournalAmerican Journal of Pathology
Volume184
Issue number7
DOIs
StatePublished - Jul 2014

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