Journal
NEUROCHEMISTRY INTERNATIONAL
Volume 55, Issue 8, Pages 768-774Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuint.2009.07.011
Keywords
TRPV1; Retinoic acid; Differentiation; Ca2+; In vitro
Categories
Funding
- Swedish Fund for Research
- Swedish Animal Welfare Agency
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The transient receptor potential vanilloid subtype 1 (TRPV1) is a Ca2+-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 Ca2+ concentration by 30% as well as the relative capsaicin-induced Ca2+ influx. The results show that TRPV1 protein expression increases during RA-induced differentiation in vitro, which generates an altered intracellular Ca2+ homeostasis. (C) 2009 Elsevier Ltd. All rights reserved
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