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2010 ; 79
(1
): 1-9
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Semaphorin 5A promotes angiogenesis by increasing endothelial cell proliferation,
migration, and decreasing apoptosis
#MMPMID19850054
Sadanandam A
; Rosenbaugh EG
; Singh S
; Varney M
; Singh RK
Microvasc Res
2010[Jan]; 79
(1
): 1-9
PMID19850054
show ga
Semaphorin 5A (mouse, Sema5A; human, SEMA5A), is an axon regulator molecule and
plays major roles during neuronal and vascular development. The importance of
Sema5A during vasculogenesis, however, is unclear. The fact that Sema5A deficient
mice display a defective branching of cranial vasculature supports its
participation in blood vessel formation. In this study, we tested our hypothesis
that Sema5A regulates angiogenesis by modulating various steps during
angiogenesis. Accordingly, we demonstrated that the treatment of immortalized
endothelial cells with recombinant extracellular domain of mouse Sema5A
significantly increased endothelial cell proliferation and migration and
decreased apoptosis. We also observed a relative increase of endothelial
expression of anti-apoptotic genes relative to pro-apoptotic genes in
Sema5A-treated endothelial cells suggesting its role in inhibition of apoptosis.
In addition, our data suggest that Sema5A decreases apoptosis through activation
of Akt, increases migration through activating Met tyrosine kinases and
extracellular matrix degradation through matrix metalloproteinase 9. Moreover, in
vivo Matrigel plug assays demonstrated that Sema5A induces endothelial cell
migration from pre-existing vessels. In conclusion, the present work shows the
pro-angiogenic role of Sema5A and provides clues on the signaling pathways that
underlie them.