Tyrosine phosphatase and cytochrome P450 activity are critical in regulating store-operated calcium channels in human fibroblasts

Kyung-Mi Lee, Sang Wook Son, György Babnigg, Mitchel L. Villereal

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Diverse signaling pathways have been proposed to regulate store-operated calcium entry (SOCE) in a wide variety of cell types. However, it still needs to be determined if all of these known pathways operate in a single cell type. In this study, we examined involvement of various signaling molecules in SOCE using human fibroblast cells (HSWP). Bradykinin (BK)-stimulated Ca2+ entry, previously shown to be via SOCE, is enhanced by the addition of vanadate, an inhibitor of tyrosine phosphatases. Furthermore, SOCE is regulated by cytochrome P-450, as demonstrated by the fact that the products of cytochrome P-450 activity (14,15 EET) stimulated SOCE while econazole, an inhibitor of cytochrome P450, suppressed BK-stimulated Ca2+ entry. In contrast, Ca2+ entry was unaffected by the guanylate cyclase inhibitor LY83583, or the membrane permeant cyclic GMP analog 8-bromo-cyclic GMP (8-Br-cGMP). Neither nitric oxide donors nor phorbol esters affected BK-stimulated Ca 2+ entry. SOCE in HSWP cells is primarily regulated by tyrosine phosphorylation and the cytochrome P-450 pathway, but not by cyclic GMP, nitric oxide, or protein kinase C. Thus, multiple pathways do operate in a single cell type leading to the activation of Ca2+ entry and some of these signaling pathways are more prominently involved in regulating calcium entry in different cell types.

Original languageEnglish
Pages (from-to)703-717
Number of pages15
JournalExperimental and Molecular Medicine
Volume38
Issue number6
Publication statusPublished - 2006 Dec 31

Fingerprint

Fibroblasts
Calcium Channels
Phosphoric Monoester Hydrolases
Cytochrome P-450 Enzyme System
Tyrosine
Calcium
Bradykinin
Cyclic GMP
6-anilino-5,8-quinolinedione
Econazole
Phosphorylation
Vanadates
Nitric Oxide Donors
Guanylate Cyclase
Phorbol Esters
Protein Kinase C
Nitric Oxide
Chemical activation
Cells
Membranes

Keywords

  • Bradykinin
  • Calcium channels
  • Protein-tyrosine kinases
  • Protein-tyrosine phosphatases

ASJC Scopus subject areas

  • Biochemistry
  • Genetics

Cite this

Tyrosine phosphatase and cytochrome P450 activity are critical in regulating store-operated calcium channels in human fibroblasts. / Lee, Kyung-Mi; Son, Sang Wook; Babnigg, György; Villereal, Mitchel L.

In: Experimental and Molecular Medicine, Vol. 38, No. 6, 31.12.2006, p. 703-717.

Research output: Contribution to journalArticle

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