Abstract
Long chain fatty acids are sensed by enteroendocrine L cells that express free-fatty acid receptors, including FFA1, FFA4 and the acylethanolamine receptor GPR119. Here we investigated the acute effects of single or multiple agonism at these G protein-coupled receptors in intestinal mucosae where L cell-derived peptide YY (PYY) is anti-secretory and acts via epithelial Y1 receptors. Mouse ileal or colonic mucosae were mounted in Ussing chambers, voltage-clamped and the resultant short-circuit current (Isc) recorded continuously. The agonists used were; FFA1, TAK-875 or AM-1638; for FFA4, Merck A; or for GPR119, AR231453, PSN632408 or AR440006. Their responses were compared with those of pinolenic acid (PA, a presumed dual FFA1/FFA4 agonist) and the lipid emulsion, Intralipid. The FFA1 agonist AM-1638 (EC50 = 38.2 nM) was more potent than TAK-875 (EC50 = 203.1 nM) but exhibited similar efficacy. GPR119 agonism (AR231453) pretreatment enhanced subsequent FFA1 (AM-1638 or TAK-875) and FFA4 (Merck A) signalling. PA (EC50 = 298.2 nM) co-activated epithelial FFA1 and FFA4 and involved endogenous PYY Y1/Y2-receptor mechanisms but desensitisation was observed between PA and high GPR119 agonist concentrations. Apical Intralipid co-activated FFA1, FFA4 and GPR119 with a residual component not being attributable to PYY, or this trio of fatty acid receptors.
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