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• W2019122252 abstract "Splenomegaly is a frequent hallmark of portal hypertension that, in some cases, can be very prominent and cause symptoms like abdominal pain, splenic infarction, and cytopenia. This study characterizes the pathogenetic mechanisms leading to spleen enlargement in portal hypertensive rats and focuses on mTOR pathway as a potential modulator of splenomegaly in portal hypertension.Characterization of splenomegaly was performed by histological, hematological, immunohistochemical and Western blot analyses in rats with portal hypertension induced by portal vein ligation, and compared with sham-operated animals. The contribution of the mTOR signaling pathway to splenomegaly was determined in rats with fully developed portal hypertension and control rats by treatment with rapamycin or vehicle.Our results illustrate that splenomegaly in portal hypertensive rats arises as a consequence of the interplay of several factors, including not only spleen congestion, as traditionally thought, but also enlargement and hyperactivation of the splenic lymphoid tissue, as well as increased angiogenesis and fibrogenesis. Since mTOR signaling plays a central role in immunological processes, angiogenesis and fibrogenesis, we next determined the involvement of mTOR in splenomegaly. Interestingly, mTOR signaling was overactivated in the spleen of portal hypertensive rats, and mTOR blockade by rapamycin profoundly ameliorated splenomegaly, causing a 44% decrease in spleen size. This effect was most likely accounted for the inhibitory action of rapamycin on lymphocyte proliferation, neovascularization and fibrosis.These findings shed light on the pathogenesis of splenomegaly in portal hypertension, and identify mTOR signaling as a potential target for therapeutic intervention in this disease." @default.
• W2019122252 created "2016-06-24" @default.
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• W2019122252 date "2010-04-01" @default.
• W2019122252 modified "2023-10-14" @default.
• W2019122252 title "Relevance of the mTOR signaling pathway in the pathophysiology of splenomegaly in rats with chronic portal hypertension" @default.
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• W2019122252 doi "https://doi.org/10.1016/j.jhep.2010.01.004" @default.
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