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Articles by Y. D Zhao
Total Records ( 2 ) for Y. D Zhao
  Y. D Zhao , H Ohkawara , J Rehman , K. K Wary , S. M Vogel , R. D Minshall , Y. Y Zhao and A. B. Malik

Rationale: Little is known about the contribution of bone marrow–derived progenitor cells (BMPCs) in the regulation endothelial barrier function as defined by microvascular permeability alterations at the level of adherens junctions (AJs).

Objective: We investigated the role of BMPCs in annealing AJs and thereby in preventing lung edema formation induced by endotoxin (LPS).

Methods and Results: We observed that BMPCs enhanced basal endothelial barrier function and prevented the increase in pulmonary microvascular permeability and edema formation in mice after LPS challenge. Coculture of BMPCs with endothelial cells induced Rac1 and Cdc42 activation and AJ assembly in endothelial cells. However, transplantation of BMPCs isolated from sphingosine kinase-1–null mice (SPHK1–/–), having impaired S1P production, failed to activate Rac1 and Cdc42 or protect the endothelial barrier.

Conclusions: These results demonstrate that BMPCs have the ability to reanneal endothelial AJs by paracrine S1P release in the inflammatory milieu and the consequent activation of Rac-1 and Cdc42 in endothelial cells.

  M. K Mirza , Y Sun , Y. D Zhao , H. H S.K. Potula , R. S Frey , S. M Vogel , A. B Malik and Y. Y. Zhao

Repair of the injured vascular intima requires a series of coordinated events that mediate both endothelial regeneration and reannealing of adherens junctions (AJs) to form a restrictive endothelial barrier. The forkhead transcription factor FoxM1 is essential for endothelial proliferation after vascular injury. However, little is known about mechanisms by which FoxM1 regulates endothelial barrier reannealing. Here, using a mouse model with endothelial cell (EC)-restricted disruption of FoxM1 (FoxM1 CKO) and primary cultures of ECs with small interfering RNA (siRNA)-mediated knockdown of FoxM1, we demonstrate a novel requisite role of FoxM1 in mediating endothelial AJ barrier repair through the transcriptional control of β-catenin. In the FoxM1 CKO lung vasculature, we observed persistent microvessel leakage characterized by impaired reannealing of endothelial AJs after endothelial injury. We also showed that FoxM1 directly regulated β-catenin transcription and that reexpression of β-catenin rescued the defective AJ barrier–reannealing phenotype of FoxM1-deficient ECs. Knockdown of β-catenin mimicked the phenotype of defective barrier recovery seen in FoxM1-deficient ECs. These data demonstrate that FoxM1 is required for reannealing of endothelial AJs in order to form a restrictive endothelial barrier through transcriptional control of β-catenin expression. Therefore, means of activating FoxM1-mediated endothelial repair represent a new therapeutic strategy for the treatment of inflammatory vascular diseases associated with persistent vascular barrier leakiness such as acute lung injury.

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