Role of Transient Receptor Potential C3 in TNF-alpha-enhanced Calcium Influx in Human Airway Myocytes

Overview

Journal Am J Respir Cell Mol Biol

Specialties Cell Biology
Molecular Biology

Date 2006 Apr 1

PMID 16574942

Citations 59

Authors

Thomas A White

Ailing Xue

Eduardo N Chini

Michael Thompson

Gary C Sieck

Mark E Wylam

Affiliations

Soon will be listed here.

Abstract

Previous studies have suggested that the proinflammatory cytokine, TNF-alpha, contributes to airway hyperresponsivness by altering airway smooth muscle (ASM) Ca(2+) responses to agonist stimulation. The present study examined the effects of TNF-alpha on Ca(2+) influx pathways in cultured human ASM cells (HASMCs). Proteins encoded by the transient receptor potential (TRP) gene family function as channels through which receptor-operated and store-operated Ca(2+) entry (SOCE) occur. In the present study, the presence of TRPC1, TRPC3, TRPC4, TRPC5, and TRPC6 mRNA and protein expression was confirmed in cultured HASMCs using RT-PCR and Western blot analysis. TNF-alpha treatment significantly increased TRPC3 mRNA and protein levels in HASMCs as well as SOCE. TNF-alpha treatment also increased both the peak and plateau intracellular Ca(2+) concentration responses in HASMCs elicited by acetylcholine and bradykinin. The effects of TNF-alpha treatment on SOCE and agonist-induced intracellular Ca(2+) concentration responses were attenuated using small interfering RNA transfection, which knocked down TRPC3 expression. Thus, in inflammatory airway diseases, TNF-alpha treatment may result in increased myocyte activation due to altered Ca(2+) influx pathways. These results suggest that TRPC3 may be an important therapeutic target in inflammatory airway diseases such as asthma and chronic obstructive pulmonary disease.

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