Semaphorin 7a exerts pleiotropic effects to promote breast tumor progression

S. A. Black, A. C. Nelson, N. J. Gurule, B. W. Futscher, T. R. Lyons

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Understanding what drives breast tumor progression is of utmost importance for blocking tumor metastasis; we have identified that semaphorin 7a is a potent driver of ductal carcinoma in situ (DCIS) progression. Semaphorin 7a is a glycophosphatidylinositol membrane-anchored protein that promotes attachment and spreading in multiple cell types. Here, we show that increased expression of SEMA7A occurs in a large percentage of breast cancers and is associated with decreased overall and distant metastasis-free survival. In both in vitro and in vivo models, short hairpin-mediated silencing of SEMA7A reveals roles for semaphorin 7a in the promotion of DCIS growth, motility and invasion as well as lymphangiogenesis in the tumor microenvironment. Our studies also uncover a relationship between COX-2 and semaphorin 7a expression and suggest that semaphorin 7a promotes tumor cell invasion on collagen and lymphangiogenesis via activation of β 1 -integrin receptor. Our results suggest that semaphorin 7a may be novel target for blocking breast tumor progression.

Original languageEnglish (US)
Pages (from-to)5170-5178
Number of pages9
Issue number39
StatePublished - Sep 29 2016

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