Abstract:
:CCN1 is highly expressed in cancer cells and has been identified in the secretome of bone marrow-derived mesenchymal stem cells (BM-MSC). Although secreted CCN1 is known to promote angiogenesis, its underlying mechanism remains unclear. Here, we examined whether our recently-established tonsil-derived MSC (T-MSC) secrete CCN1 and, if any, how CCN1 promotes the angiogenesis of human umbilical vein endothelial cells (HUVEC). Compared with untreated control T-MSC, a higher level of CCN1 was secreted by T-MSC treated with activin A and sonic hedgehog, drugs known to induce endodermal differentiation. Expectedly, conditioned medium collected from differentiated T-MSC (DCM) significantly increased HUVEC migration and tube formation compared with that from control T-MSC (CCM), and these stimulatory effects were reversed by neutralization with anti-CCN1 antibody. Treatment with recombinant human CCN1 (rh-CCN1) alone also mimicked the stimulatory effects of DCM. Furthermore, treatment with either DCM or rh-CCN1 increased the phosphorylation of AMP kinase (AMPK), and ectopic expression of siRNA of the AMPK gene inhibited all observed effects of both DCM and rh-CCN1. However, no alteration of intracellular ATP levels or phosphorylation of LKB1, a well-known upstream factor of AMPK activation, was observed under our conditions. Finally, the neutralization of integrin α(v) β(3) with anti-integrin α(v) β(3) antibody almost completely reversed the effects of CCN1 on AMPK phosphorylation, and EC migration and tube formation. Taken together, we demonstrated that T-MSC increase the secretion of CCN1 in response to endodermal differentiation and that integrin α(v) β(3) and AMPK mediate CCN1-induced EC migration and tube formation independent of intracellular ATP levels alteration.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Park YS,Hwang S,Jin YM,Yu Y,Jung SA,Jung SC,Ryu KH,Kim HS,Jo Idoi
10.1002/jcp.24690subject
Has Abstractpub_date
2015-01-01 00:00:00pages
140-9issue
1eissn
0021-9541issn
1097-4652journal_volume
230pub_type
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