Modulation of H2 histamine receptor-mediated cAMP generation and granulocytic differentiation by extracellular nucleotides via activation of protein kinase C

Byung Chang Suh, Hyosang Lee, Ihn Soon Lee, Kyong Tai Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Extracellular ATP exerts a variety of biological actions through several kinds of P2 receptor in HL-60 promyelocytes. We show that stimulation of P2Y2 receptors with ATP and analogs resulted in the inhibition of a subsequently histamine-induced cAMP production and functional differentiation. Treatment of the cells with phorbol 12-myristate 13-acetate also blocked the histamine-mediated cAMP generation just as ATP did. Incubation of the cells with the protein kinase C inhibitor bisindolylmaleimide (GF109203X) abolished the inhibitory effects of extracellular nucleotides, suggesting that protein kinase C may act as an inter-regulator between two receptors. However, ATP did not affect the binding affinity or total binding of [3H]histamine to membrane receptors; it also did not heterologously desensitize H2 receptors. The ATP treatment synergistically elevated the cAMP levels induced directly by forskolin or indirectly by G protein activation after cholera toxin treatment. This indicates that the site of the protein kinase C action is not the G protein or effector enzyme. Co-stimulation of the cells with nucleotides and histamine inhibited histamine-mediated granulocytic differentiation, which was evaluated by looking at the extent of N-formyl-methionyl-leucyl-phenylalanine responses. Taken together, the results demonstrate that extracellular nucleotides are negatively involved in the modulation of hitamine signaling via activation of protein kinase C, probably by inhibiting coupling between receptor and G protein.

Original languageEnglish
Pages (from-to)169-176
Number of pages8
JournalJournal of Leukocyte Biology
Volume69
Issue number1
StatePublished - 2001

Keywords

  • Cholera toxin
  • G protein
  • Phorbol 12-myristate 13-acetate

Fingerprint

Dive into the research topics of 'Modulation of H2 histamine receptor-mediated cAMP generation and granulocytic differentiation by extracellular nucleotides via activation of protein kinase C'. Together they form a unique fingerprint.

Cite this