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TRPV1 Expression and Activity During Retinoic Acid-induced Neuronal Differentiation

Overview
Journal Neurochem Int
Specialties Chemistry
Neurology
Date 2009 Aug 5
PMID 19651168
Citations 21
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Abstract

The transient receptor potential vanilloid subtype 1 (TRPV1) is a Ca(2+)-permeable channel primarily expressed in dorsal root ganglion neurons. Besides its function in thermogenic nociception and neurogenic inflammation, TRPV1 is involved in cell migration, cytoskeleton re-organisation and in neuronal guidance. To explore the TRPV1 level and activity during conditions for neuronal maturation, TRPV1-expressing SHSY5Y neuroblastoma cells were differentiated into a neuronal phenotype using all-trans-retinoic acid (RA). We show that RA highly up-regulated the total and cell surface TRPV1 protein expression but the TRPV1 mRNA level was unaffected. The up-regulated receptors were localised to the cell bodies and the developed neurites. Furthermore, RA increased both the basal intracellular free Ca(2+) concentration by 30% as well as the relative capsaicin-induced Ca(2+) influx. The results show that TRPV1 protein expression increases during RA-induced differentiation in vitro, which generates an altered intracellular Ca(2+) homeostasis.

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