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• W4315436903 abstract "Abstract The Transient Receptor Potential Vanilloid 4 (TRPV4) channel has been shown to function in many physiological and pathophysiological processes. Despite abundant information on its importance in physiology, very few endogenous agonists for this channel have been described, and very few underlying mechanisms for its activation have been clarified. TRPV4 is expressed by several types of cells, such as vascular endothelial, and skin and lung epithelial cells, where it plays pivotal roles in their function. In the present study, we show that TRPV4 is activated by lysophosphatidic acid (LPA) in both endogenous and heterologous expression systems, pinpointing this molecule as one of the few known endogenous agonists for TRPV4. Importantly, LPA is a bioactive glycerophospholipid, relevant in several physiological conditions, including inflammation and vascular function, where TRPV4 has also been found to be essential. Here we also provide mechanistic details of the activation of TRPV4 by LPA and another glycerophospholipid, lysophosphatidylcholine (LPC), and show that LPA directly interacts with both the N‐ and C‐terminal regions of TRPV4 to activate this channel. Moreover, we show that LPC activates TRPV4 by producing an open state with a different single‐channel conductance to that observed with LPA. Our data suggest that the activation of TRPV4 can be finely tuned in response to different endogenous lipids, highlighting this phenomenon as a regulator of cell and organismal physiology. image Key points The Transient Receptor Potential Vaniloid (TRPV) 4 ion channel is a widely distributed protein with important roles in normal and disease physiology for which few endogenous ligands are known. TRPV4 is activated by a bioactive lipid, lysophosphatidic acid (LPA) 18:1, in a dose‐dependent manner, in both a primary and a heterologous expression system. Activation of TRPV4 by LPA18:1 requires residues in the N‐ and C‐termini of the ion channel. Single‐channel recordings show that TRPV4 is activated with a decreased current amplitude (conductance) in the presence of lysophosphatidylcholine (LPC) 18:1, while LPA18:1 and GSK101 activate the channel with a larger single‐channel amplitude. Distinct single‐channel amplitudes produced by LPA18:1 and LPC18:1 could differentially modulate the responses of the cells expressing TRPV4 under different physiological conditions." @default.
• W4315436903 created "2023-01-11" @default.
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• W4315436903 date "2023-01-31" @default.
• W4315436903 modified "2023-10-09" @default.
• W4315436903 title "Modes of action of lysophospholipids as endogenous activators of the TRPV4 ion channel" @default.
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• W4315436903 doi "https://doi.org/10.1113/jp284262" @default.
• W4315436903 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36625071" @default.
• W4315436903 hasPublicationYear "2023" @default.
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