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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

In vitro macrophage activity: Biphasic effect of prolactin and indirect evidence of dopaminergic modulation

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Author(s):
Carvalho-Freitas, Maria I. R. [1] ; Rodrigues-Costa, Elaine C. [1] ; Nasello, Antonia G. [1] ; Palermo-Neto, Joao [1] ; Felicio, Luciano F. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Dept Pathol, Sch Vet Med, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: NEUROIMMUNOMODULATION; v. 15, n. 2, p. 131-139, 2008.
Web of Science Citations: 20
Abstract

Objective: Prolactin (PRL), a peptide hormone produced by the pituitary gland, is involved in the interaction between the neuroendocrine and immune system. Since dopamine receptor antagonists increase serum levels of PRL, both PRL and dopamine receptors might be involved in the modulation of macrophage activity, providing means of communication between the nervous and immune systems. This study evaluated the effects of PRL and the dopamine antagonist domperidone (DOMP) on macrophage activity of female rats. Methods: Oxidative burst and phagocytosis of peritoneal macrophages were evaluated by flow cytometry. Samples of peritoneal liquid from female rats were first incubated with PRL (10 and 100 nM) for different periods. The same procedure was repeated to evaluate the effects of DOMP (10 and 100 nM). Results: In vitro incubation of macrophages with 10 nM DOMP decreased oxidative burst, after 30 min, whereas the PMA-induced burst was decreased by DOMP 10 nM after 2 and 4 h. Treatment with PRL (10 and 100 nM) for 30 min decreased oxidative burst and rate of phagocytosis (10 nM). After 2 h of incubation, 10 nM PRL decreased oxidative burst and phagocytosis intensity, but increased the rate of phagocytosis. On the other hand, after 4 h, PRL 10 and 100 nM increased oxidative burst and the rate of phagocytosis, but decreased intensity of phagocytosis. Conclusions: These observations suggest that macrophage functions are regulated by an endogenous dopaminergic tone. Our data also suggest that both PRL and dopamine exert their action by acting directly on the peritoneal macrophage. Copyright (C) 2008 S. Karger AG, Basel. (AU)

FAPESP's process: 04/14128-0 - Neuroimmunomodulation: effects of drugs, stress and cytocines on central nervous and immune systems bidirectional relationships
Grantee:João Palermo Neto
Support Opportunities: Research Projects - Thematic Grants