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Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Microcirculation 2017 ; 24 (3): ä Nephropedia Template TP
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The pro-inflammatory cytokine TNF-? inhibits lymphatic pumping via activation of the NF-?B - iNOS signaling pathway #MMPMID28231612
Chen Y; Rehal S; Roizes S; Zhu HL; Cole WC; von der Weid PY
Microcirculation 2017[Apr]; 24 (3): ä PMID28231612show ga
Objective: Mesenteric lymphatic vessels pumping, important to propel lymph and immune cells from the intestinal interstitium to the mesenteric lymph nodes, is compromised during intestinal inflammation. The objective of this study was to test the hypothesis that the pro-inflammatory cytokine tumor necrosis factor alpha (TNF-?), is a significant contributor to the inflammation-induced lymphatic contractile dysfunction, and to determine its mode of action. Methods: Contractile parameters were obtained form isolated rat mesenteric lymphatic vessels mounted on a pressure myograph after 24-h incubation with or without TNF-?. Various inhibitors were administered and quantitative real-time PCR, western blotting and immunofluorescence confocal imaging were applied to characterize the mechanisms involved in TNF-? actions. Results: Vessel contraction frequency was significantly decreased after TNF-? treatment and could be restored by selective inhibition of NF-?B, iNOS, guanylate cyclase and ATP-sensitive K+ channels. We further demonstrated that NF-?B inhibition also suppressed the significant increase in iNOS mRNA observed in TNF-?-treated lymphatic vessels and that TNF-? treatment favor the nuclear translocation of the p65 NF-?B subunit. Conclusions: These findings suggest that TNF-? decreases mesenteric lymphatic contractility by activating the NF-?B - iNOS signaling pathway. This mechanism could contribute to the alteration of lymphatic pumping reported in intestinal inflammation.