Abstract
Tobacco smoke (TS) interacts with inflammatory cytokines to produce endothelial dysfunction. We hypothesized that interleukin-1beta (IL-1beta) plus TS (TS/IL-1beta) induces disassembly of endothelial junctional complexes of VE-cadherin/beta-catenin by suppression of PTEN activity and investigated molecular mechanisms that modulate PTEN-deactivation in this situation. TS/IL-1beta exposure, which disrupted adherens junctions and induced nuclear beta-catenin accumulation, increased tyrosine phosphorylation (p-Tyr) of VE-cadherin and beta-catenin, and reduced PTEN activity. Overexpression or silencing of PTEN modulated p-Tyr of both VE-cadherin and beta-catenin, changed assembly of adherens junction complexes, and altered nuclear beta-catenin accumulation. In addition, inhibiting ROS production stimulated by TS/IL-1beta decreased activation of Src, EGFR and p38MAPK, phosphorylation of PTEN, VE-cadherin and beta-catenin, and abrogated the effect of TS/IL-1beta to disorganize adherens junctions, resulting in reduced endothelial permeability and decreased nuclear beta-catenin accumulation. Finally, exposure of ApoE(-/-) mice to cigarette smoke-induced phosphorylation of Src, EGFR, p-38MAPK, PTEN, and beta-catenin, and disrupted VE-cad...Continue Reading
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