Studies on the involvement of endogenous neuropeptides in the control of thymocyte proliferation in the rat.

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 Histopathol

authors

Trejter M,Warchol JB,de Caro R,Brelinska R,Nussdorfer GG,Malendowicz LK

doi

10.14670/HH-16.155

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

155-8

issue

1

eissn

0213-3911

issn

1699-5848

journal_volume

16

pub_type

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