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PMID: 17596456 Published · ppublish English Journal Article Research Support, N.I.H., Intramural Research Support, Non-U.S. Gov't

Dual regulation of TRPV1 by phosphoinositides.

Lukacs V, Thyagarajan B, Varnai P, Balla A, Balla T, Rohacs T

Abstract

The membrane phospholipid phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2 or PIP2] regulates many ion channels. There are conflicting reports on the effect of PtdIns(4,5)P2 on transient receptor potential vanilloid 1 (TRPV1) channels. We show that in excised patches PtdIns(4,5)P2 and other phosphoinositides activate and the PIP2 scavenger poly-Lys inhibits TRPV1. TRPV1 currents undergo desensitization on exposure to high concentrations of capsaicin in the presence of extracellular Ca2+. We show that in the presence of extracellular Ca2+, capsaicin activates phospholipase C (PLC) in TRPV1-expressing cells, inducing depletion of both PtdIns(4,5)P2 and its precursor PtdIns(4)P (PIP). The PLC inhibitor U73122 and dialysis of PtdIns(4,5)P2 or PtdIns(4)P through the patch pipette inhibited desensitization of TRPV1, indicating that Ca2+-induced activation of PLC contributes to desensitization of TRPV1 by depletion of PtdIns(4,5)P2 and PtdIns(4)P. Selective conversion of PtdIns(4,5)P2 to PtdIns(4)P by a rapamycin-inducible PIP2 5-phosphatase did not inhibit TRPV1 at high capsaicin concentrations, suggesting a significant role for PtdIns(4)P in maintaining channel activity. Currents induced by low concentrations of capsaicin and moderate heat, however, were potentiated by conversion of PtdIns(4,5)P2 to PtdIns(4)P. Increasing PtdIns(4,5)P2 levels by coexpressing phosphatidylinositol-4-phosphate 5-kinase inhibited TRPV1 at low but not at saturating capsaicin concentrations. These data show that at low capsaicin concentrations and other moderate stimuli, PtdIns(4,5)P2 partially inhibits TRPV1 in a cellular context, but this effect is likely to be indirect, because it is not detectable in excised patches. We conclude that phosphoinositides have both inhibitory and activating effects on TRPV1, resulting in complex and distinct regulation at various stimulation levels.

MeSH Terms
Animals Calcium Signaling/drug effects,physiology Capsaicin/pharmacology Cell Line Cell Membrane/drug effects,metabolism Enzyme Inhibitors/pharmacology Hot Temperature/adverse effects Humans Neurons, Afferent/drug effects,metabolism Nociceptors/drug effects,metabolism Oocytes Pain/chemically induced,metabolism,physiopathology Phosphatidylinositol 4,5-Diphosphate/metabolism,pharmacology Phosphatidylinositol Phosphates/metabolism Phosphatidylinositols/metabolism,pharmacology Phosphoric Monoester Hydrolases/metabolism,pharmacology Rats TRPV Cation Channels/drug effects,metabolism Type C Phospholipases/antagonists & inhibitors,metabolism Xenopus laevis
Chemicals
Enzyme Inhibitors Phosphatidylinositol 4,5-Diphosphate Phosphatidylinositol Phosphates Phosphatidylinositols TRPV Cation Channels TRPV1 protein, human Phosphoric Monoester Hydrolases Type C Phospholipases Capsaicin
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Lukacs Viktor
Department of Pharmacology and Physiology, University of Medicine and Dentistry of New Jersey-New Jersey Medical School, Newark, New Jersey 07103, USA.
Thyagarajan Baskaran
Varnai Peter
Balla Andras
Balla Tamas
Rohacs Tibor
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Article Info
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
Abbr.
J Neurosci
ISSN
1529-2401
Published
2007-06-27
Pages
7070-80
Language
English
Region
United States
NLM ID
8102140
PMCID
PMC6672228
Subset
IM
Grants
NINDS NIH HHS · R01 NS055159 · United States
Intramural NIH HHS · United States
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Analysis Services

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