Document Detail


Capsaicin causes protein synthesis inhibition and microtubule disassembly through TRPV1 activities both on the plasma membrane and intracellular membranes.
MedLine Citation:
PMID:  17274957     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
TRPV1 is a non-selective cationic channel that is activated by capsaicin, acidic pH and thermal stimuli. Sustained TRPV1 channel activation causes severe cytotoxicity that leads to cell death. In this study, we investigated the mechanisms of capsaicin-induced cytotoxicity in HEK293 cells stably expressing TRPV1 with a focus on protein synthesis regulation and cytoskeleton reorganization. Capsaicin inhibited protein synthesis in TRPV1-expressing HEK cells with an IC(50) of 15.6nM and depolymerized microtubules within 10min after exposure. These effects were completely blocked by pretreatment of cells with the TRPV1 antagonist A-425619, both in the presence and absence of extracellular calcium. Protein synthesis inhibition induced by capsaicin was not a result of eIF2alpha hyperphosphorylation, but rather closely correlated with cytosolic calcium elevation caused by calcium flux through cell surface and intracellular TRPV1, and/or ER calcium depletion through intracellular TRPV1. Microtubule dependent cell process shrinkage may serve as a mechanism for rapid alteration of the neurotransmission network upon TRPV1 activation. Taken together, the present studies demonstrate that intracellular pool of TRPV1 plays an important role in regulating cell morphology and viability upon receptor activation.
Authors:
Ping Han; Heath A McDonald; Bruce R Bianchi; Rachid El Kouhen; Melissa H Vos; Michael F Jarvis; Connie R Faltynek; Robert B Moreland
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Publication Detail:
Type:  Journal Article     Date:  2007-01-14
Journal Detail:
Title:  Biochemical pharmacology     Volume:  73     ISSN:  0006-2952     ISO Abbreviation:  Biochem. Pharmacol.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-09     Completed Date:  2007-06-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0101032     Medline TA:  Biochem Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1635-45     Citation Subset:  IM    
Affiliation:
Neuroscience Research, Global Pharmaceutical Research and Development, Abbott Laboratories, Abbott Park, IL 60064, USA. ping.han@abbott.com
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MeSH Terms
Descriptor/Qualifier:
Animals
Calcium / metabolism*
Capsaicin / pharmacology*
Cell Membrane
Cells, Cultured
Cytosol / metabolism
Eukaryotic Initiation Factor-2 / metabolism
Humans
Intracellular Membranes
Microtubules / chemistry,  drug effects*,  metabolism
Phosphorylation
Protein Synthesis Inhibitors / pharmacology*
Rats
TRPV Cation Channels
Chemical
Reg. No./Substance:
0/Eukaryotic Initiation Factor-2; 0/Protein Synthesis Inhibitors; 0/TRPV Cation Channels; 404-86-4/Capsaicin; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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