Abstract:
:The possible involvement of endogenous vasoactive intestinal peptide (VIP), cholecystokinin (CCK) and neurotensin (NT) in the control of thymocyte proliferation has been investigated in vivo in the immature rat. For this task, we have studied the effects of the administration of selective antagonists of the receptors of the three neuropeptides on the mitotic index (% of metaphase-arrested cells after vincristin injection) of thymocytes. Both CCK- and TN-receptor antagonists were ineffective. In contrast, two VIP receptor antagonists (VIP-As) enhanced the mitotic index of thymocytes. VIP reversed the effect of VIP-As, but when administered alone it did not alter the mitotic activity of thymocytes. In light of these findings, we conclude that endogenous VIP exerts a maximal tonic inhibitory influence on the basal proliferative activity of rat thymocytes, while endogenous CCK and NT do not play a relevant modulatory role in this process.
journal_name
Histol Histopatholjournal_title
Histology and histopathologyauthors
Trejter M,Warchol JB,de Caro R,Brelinska R,Nussdorfer GG,Malendowicz LKdoi
10.14670/HH-16.155subject
Has Abstractpub_date
2001-01-01 00:00:00pages
155-8issue
1eissn
0213-3911issn
1699-5848journal_volume
16pub_type
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