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Articles by J Rehman
Total Records ( 2 ) for J Rehman
  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 Hofmann Bowman , J Wilk , A Heydemann , G Kim , J Rehman , J. A Lodato , J Raman and E. M. McNally

Rationale: S100A12 is a small calcium binding protein that is a ligand of RAGE (receptor for advanced glycation end products). RAGE has been extensively implicated in inflammatory states such as atherosclerosis, but the role of S100A12 as its ligand is less clear.

Objective: To test the role of S100A12 in vascular inflammation, we generated and analyzed mice expressing human S100A12 in vascular smooth muscle under control of the smooth muscle 22 promoter because S100A12 is not present in mice.

Methods and Results: Transgenic mice displayed pathological vascular remodeling with aberrant thickening of the aortic media, disarray of elastic fibers, and increased collagen deposition, together with increased latent matrix metalloproteinase-2 protein and reduction in smooth muscle stress fibers leading to a progressive dilatation of the aorta. In primary aortic smooth muscle cell cultures, we found that S100A12 mediates increased interleukin-6 production, activation of transforming growth factor β pathways and increased metabolic activity with enhanced oxidative stress. To correlate our findings to human aortic aneurysmal disease, we examined S100A12 expression in aortic tissue from patients with thoracic aortic aneurysm and found increased S100A12 expression in vascular smooth muscle cells.

Conclusions: S100A12 expression is sufficient to activate pathogenic pathways through the modulation of oxidative stress, inflammation and vascular remodeling in vivo.

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