In fibroblasts Vegf-D expression is induced by cell-cell contact mediated by cadherin-11
- PMID: 11108717
- DOI: 10.1074/jbc.M009573200
In fibroblasts Vegf-D expression is induced by cell-cell contact mediated by cadherin-11
Abstract
Vascular endothelial growth factors (VEGFs) are a highly conserved family of growth factors all angiogenic in vivo with mitogenic and chemotactic activity on endothelial cells. VEGFs are expressed in fibroblasts either in hypoxia or in response to growth factors. Here we report that, differently from the other members of the family, Vegf-D is induced by cell-cell contact. By in situ hybridization we demonstrated that noninteracting fibroblasts express low levels of Vegf-D mRNA, whereas contacting cells express high levels of Vegf-D transcripts. By immunostaining we observed that the surface protein cadherin-11 is localized at the opposite sites of interacting cell surfaces. Ca(2+) deprivation from the culture medium determined the loss of cadherin-11 from the cell surfaces and down-regulation of Vegf-D mRNA. Moreover, a cadherin-11 antisense RNA construct inhibited Vegf-D expression in confluent BALB/c fibroblasts, whereas in NIH 3T3 cells, which express low levels of cadherin-11, Vegf-D induction could be obtained by overexpression of cadherin-11. This suggests that cell interaction mediated by cadherin-11 induces the expression of the angiogenic factor Vegf-D in fibroblasts.
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