Beta-adrenoceptor responsiveness of splenic macrophages in normotensive and hypertensive rats.

Abstract:

:The aim of the present study was to investigate putative mechanisms implicated in the impaired phagocytic response of spontaneously hypertensive rats (SHR)1. The effect of in vitro treatment with isoproterenol (ISO), a beta-adrenergic drug, on phagocytosis and respiratory burst by splenic macrophages (SpMø) from normotensive Wistar-Kyoto rats (WKY) and SHR with established hypertension, respectively, was evaluated. Furthermore, the relaxant effect of ISO was determined in phenilephrine-precontracted thoracic aorta strips from SHR compared with age-matched WKY rats. Results indicate that exposure of rat SpMø to ISO generate a significant and dose-dependent reduction of phagocytosis and oxidative burst which was antagonized, almost completely, by the beta-adrenergic antagonist propranolol (PRO). Unlike normotensive, in hypertensive rats treatment with ISO fail to modulate phagocytosis and respiratory burst activity by SpMø. At vascular level, aortic relaxation by ISO was reduced in SHR when compared to WKY rats. These findings suggest that SHR exhibit changes not only in vascular, but also in macrophage beta-adrenoceptor-mediated responses. It is postulable that sympathetic overactivity could be responsible for impaired phagocytic functions and beta-receptor alterations observed in SHR.

authors

Serio M,Potenza MA,Montagnani M,Mansi G,Mitolo-Chieppa D,Jirillo E

doi

10.3109/08923979609052735

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

247-65

issue

2

eissn

0892-3973

issn

1532-2513

journal_volume

18

pub_type

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