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The mechanisms by which microvascular alterations contribute to the pathogenesis of the inflammatory bowel diseases (IBDs; Crohn's disease, ulcerative colitis) have not been clearly delineated. The purpose of the current study was to characterize the inflammatory events, microvascular alterations, and blood cell changes that occur in a mouse model of IBD. In this model, CD4(+) T-lymphocytes obtained from interleukin-10-deficient mice were injected intraperitoneally into lymphopenic, recombinase-activating gene-1 deficient (RAG(-/-)) mice. Two groups of control mice were also included: RAG(-/-) mice and C57BL/6 mice that were injected with phosphate-buffered saline but did not receive the T-cells. Four weeks later, the RAG(-/-) mice that had received the T-cell transfer showed significant signs of colonic inflammation, but without significant decreases in either body weight or mean arterial blood pressure. T-cell transfer increased the volume % of circulating platelets, while decreasing the number of circulating red blood cells. Additionally, the T-cell transfer tended to increase the circulating numbers of both lymphocytes and neutrophils when compared to unmanipulated RAG(-/-) mice. First-order colonic arterioles and venules tended to dilate in the colitic mice; however, the dilation was considerably more substantial with higher numbers of circulating leukocytes. The possibility that circulating inflammatory cells initiate the microvascular alterations in colitis warrants further investigation.

Relationship among circulating leukocytes, platelets, and microvascular responses during induction of chronic colitis