Corticotropin-releasing factor-induced production of cyclic AMP by human peripheral blood immunocytes

Vijendra K. Singh, Sy Jye Christine Leu

研究成果: 雜誌貢獻文章同行評審

19 引文 斯高帕斯(Scopus)


The immunomodulating properties of a neuropeptide hormone, corticotropin-releasing factor (CRF), led us to investigate its effect on cAMP production by human peripheral blood mononuclear cells (MNC). In response to stimulation with CRF (100 nM), a statistically significant (P = 0.019) increase occurred in the amount of cAMP produced by MNC. Purified monocytes, but not lymphocytes, also displayed a significant (P = 0.01) increase (8- to 10-fold) in intracellular cAMP after treatment with CRF (100 nM). The antagonist α-helical CRF9-41 (100 nM) counteracted the cAMP increase induced by CRF (100 nM). The CRF-induced cAMP production was augmented by pretreatment of MNC with a cAMP-dependent protein kinase (PKA) peptide inhibitor (PI20), but was virtually unaffected by the protein kinase C (PKC) inhibitor H7, suggesting a role for cAMP signalling. Moreover, the CRF-stimulated cAMP level was reduced to baseline by intracellular Ca2+ antagonist HA1004, indicating a role for Ca2+-signalling. Based on these findings, it is concluded that cAMP and/or Ca2+ play a second messenger role in the CRF signal transduction pathway.

頁(從 - 到)239-245
期刊Immunology Letters
出版狀態已發佈 - 1993

ASJC Scopus subject areas

  • 免疫學
  • 免疫學和過敏


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