The mechanism of antibody-dependent cellular cytotoxicity stimulation by somatostatin in rat peritoneal macrophages

Gabriella Fóris, Edit Gyimesi, István Komáromi

Research output: Article

30 Citations (Scopus)

Abstract

Somatostatin (SS) in 10-9-10-7 M concentrations stimulated the lysis and inhibited the incorporation of IgG2a-coated 51Cr-labeled sheep red blood cell (SRBC) by rat peritoneal macrophages (PM). The intracellular killing capacity of PM remained unchanged. The enhancement of Fc receptor (R) activity and generation of active oxygen species were found to be responsible for the antibody-dependent cellular cytotoxicity (ADCC)-stimulating effect of SS. It was demonstrated that the stimulation of ADCC was abolished by the calmodulin inhibitor trifluoperazine (TFP), whereas it proved to be independent of the Ca2+ uptake. In addition, SS in the ADCC-stimulating concentrations diminished the intracellular cAMP generation and progressively increased the cGMP level. In higher (10-6-10-7 M) concentrations, SS had a controversial effect on PM: it inhibited ADCC through the activation of both the adenylate cyclase and Ca2+ influx.

Original languageEnglish
Pages (from-to)217-225
Number of pages9
JournalCellular Immunology
Volume90
Issue number1
DOIs
Publication statusPublished - jan. 1985

ASJC Scopus subject areas

  • Immunology

Fingerprint Dive into the research topics of 'The mechanism of antibody-dependent cellular cytotoxicity stimulation by somatostatin in rat peritoneal macrophages'. Together they form a unique fingerprint.

  • Cite this