Inhibitory Effect of Interferons on Contractive Activity of Bovine Mesenteric Lymphatic Vessels and Nodes

摘要

We studied the effect of IFN alpha-2b and IFN beta-1a on phasic and tonic contractions of isolated bovine mesenteric lymphatic vessels and nodes. IFN alpha-2b and IFN beta-1a in concentrations of 250-1000 U/ml produced dose-dependent negative chronotropic and inotropic effects on spontaneous phasic contractions and tonus of lymphatic vessels and nodes. In de-endothelialized lymphatic vessels and nodes, IFN alpha-2b and IFN beta-1a in the same concentrations had less pronounced inhibitory effect on spontaneous contraction and tonus. L-NAME (100 mu M) and charybdotoxin (0.1 mu M with 0.5 mu M apamine) significantly attenuated the inhibitory effect of IFN alpha-2b on phasic and tonic contractions of lymph nodes. L-NAME (100 mu M) and indomethacin (10 mu M) significantly reduced the IFN alpha-2b-induced inhibitory effect on phasic and tonic contractions of lymph node. These results indicate that IFN alpha-2b and IFN beta-1a have a pronounced inhibitory effect on the phasic and tonic contractions of bovine mesenteric lymphatic vessels and nodes. The responses are endothelium-dependent and are determined by production of NO and endothelium-dependent hyperpolarizing factor by endotheliocytes in lymphatic vessels and by production of NO and prostacyclin by endotheliocytes in the lymphatic nodes.