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Eur J Pharmacol. 2014 Jan 15;723:368-74. doi: 10.1016/j.ejphar.2013.11.003. Epub 2013 Nov 12.

Free fatty acids and protein kinase C activation induce GPR120 (free fatty acid receptor 4) phosphorylation.

Author information

1
Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ap. Postal 70-248, México D. F. 04510, Mexico.
2
Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
3
Unidad de Biomedicina, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Mexico.
4
Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ap. Postal 70-248, México D. F. 04510, Mexico. Electronic address: agarcia@ifc.unam.mx.

Abstract

GPR120, free fatty acid receptor 4, is a recently deorphanized G protein-coupled receptor that seems to play cardinal roles in the regulation of metabolism and in the pathophysiology of inflammatory and metabolic disorders. In the present work a GPR120-Venus fusion protein was expressed in HEK293 Flp-In T-REx cells and its function (increase in intracellular calcium) and phosphorylation were studied. It was observed that the fusion protein migrated in sodium dodecyl sulfate-polyacrylamide gels as a band with a mass of ≈70-75kDa, although other bands of higher apparent weight (>130kDa) were also detected. Cell stimulation with docosahexaenoic acid or α-linolenic acid induced concentration-dependent increases in intracellular calcium and GPR120 phosphorylation. Activation of protein kinase C with phorbol esters also induced a marked receptor phosphorylation but did not alter the ability of 1µM docosahexaenoic acid to increase the intracellular calcium concentration. Phorbol ester-induced GPR120 phosphorylation, but not that induced with docosahexaenoic acid, was blocked by protein kinase C inhibitors (bis-indolyl-maleimide I and Gö 6976) suggesting that conventional kinase isoforms mediate this action. The absence of effect of protein kinase C inhibitors on agonist-induced GPR120 phosphorylation indicates that this kinase does not play a major role in agonist-induced receptor phosphorylation. Docosahexaenoic acid action was associated with marked GPR120 internalization whereas that induced with phorbol esters was smaller at early times.

KEYWORDS:

Free fatty acid receptor 4; GPR120; Protein kinase C; Receptor phosphorylation

PMID:
24239485
DOI:
10.1016/j.ejphar.2013.11.003
[Indexed for MEDLINE]
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