Vasoactive Intestinal Peptide or Somatostatin Inhibit Homing of Intestinal CD8+Lymphocytes in Rats
To observe the effect of vasoactive intestinal peptide(VIP) or somatostatin (SST) on the lymphocytes traffic in gut-associated lymphoid tissues in rat, 18 rats were divided into three groups at random. VIP and SST were continuously infused from femoral vein at a dose of 60 pmol/h for 7 h. It was found that the lymphocytes in intestinal lymph collected in 5 hours were significantly reduced after VIP and SST administration(P<0.05). Although the volume decreasing of intestinal lymph was happened in all groups, no significant changes in lymph flow were observed in control and treat groups. The percentages of CD8+ cells in intestinal lymph of rat treated by VIP or SST was markedly lower than that in control group (P<0.05). Finally, either VIP or SST infusion reduced CD8+ cells in the small intestinal mucosa when compared with control. It concludes that either VIP or SST not only reduces lymphocytes, especially CD8+ cells traffic from intestinal mucosa immune system to other organs and systemic immune system but also suppresses the homing of CD8+lymphocytes into intestinal mucosa immune system in rats.
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