{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T13:21:21Z","timestamp":1790256081939,"version":"4.1.0"},"reference-count":91,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T00:00:00Z","timestamp":1679875200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2023,4]]},"abstract":"\n Abstract<\/jats:title>\n \n Excess consumption of carbohydrates, fat and calories leads to non\u2010alcoholic fatty liver disease (NAFLD) and hepatic insulin resistance; these are major factors in the pathogenesis of type II diabetes. Hormones and catecholamines acting through G\u2010protein coupled receptors (GPCRs) linked to phospholipase C (PLC) and increases in cytosolic Ca\n 2+<\/jats:sup>\n ([Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n ) regulate many metabolic functions of the liver. In the intact liver, catabolic hormones such as glucagon, catecholamines and vasopressin integrate and synergize to regulate the frequency and extent to which [Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n waves propagate across hepatic lobules to control metabolism. Dysregulation of hepatic Ca\n 2+<\/jats:sup>\n homeostasis has been implicated in the development of metabolic disease, but changes in hepatic GPCR\u2010dependent Ca\n 2+<\/jats:sup>\n signalling have been largely unexplored in this context. We show that short\u2010term, 1\u2010week, high\u2010fat diet (HFD) feeding of mice attenuates noradrenaline\u2010stimulated Ca\n 2+<\/jats:sup>\n signalling, reducing the number of cells responding and suppressing the frequency of [Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n oscillations in both isolated hepatocytes and intact liver. The 1\u2010week HFD feeding paradigm did not change basal Ca\n 2+<\/jats:sup>\n homeostasis; endoplasmic reticulum Ca\n 2+<\/jats:sup>\n load, store\u2010operated Ca\n 2+<\/jats:sup>\n entry and plasma membrane Ca\n 2+<\/jats:sup>\n pump activity were unchanged compared to low\u2010fat diet (LFD)\u2010fed controls. However, noradrenaline\u2010induced inositol 1,4,5\u2010trisphosphate production was significantly reduced after HFD feeding, demonstrating an effect of HFD on receptor\u2010stimulated PLC activity. Thus, we have identified a lesion in the PLC signalling pathway induced by short\u2010term HFD feeding, which interferes with hormonal Ca\n 2+<\/jats:sup>\n signalling in isolated hepatocytes and the intact liver. These early events may drive adaptive changes in signalling, which lead to pathological consequences in fatty liver disease.\n \n \n image<\/jats:alt-text>\n <\/jats:graphic>\n <\/jats:boxed-text>\n <\/jats:p>\n <\/jats:sec>\n \n Key points<\/jats:title>\n \n \n \n Non\u2010alcoholic fatty liver disease (NAFLD) is a growing epidemic.<\/jats:p>\n <\/jats:list-item>\n \n \n In healthy liver, the counteracting effects of catabolic and anabolic hormones regulate metabolism and energy storage as fat. Hormones and catecholamines promote catabolic metabolism via increases in cytosolic Ca\n 2+<\/jats:sup>\n ([Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n ).\n <\/jats:p>\n <\/jats:list-item>\n \n \n We show that 1\u00a0week high\u2010fat diet (HFD) feeding of mice attenuated the Ca\n 2+<\/jats:sup>\n signals induced by physiological concentrations of noradrenaline. Specifically, HFD suppressed the normal pattern of periodic [Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n oscillations in isolated hepatocytes and disrupted the propagation of intralobular [Ca\n 2+<\/jats:sup>\n ]\n c<\/jats:sub>\n waves in the intact perfused liver.\n <\/jats:p>\n <\/jats:list-item>\n \n \n Short\u2010term HFD inhibited noradrenaline\u2010induced inositol 1,4,5\u2010trisphosphate generation, but did not change basal endoplasmic reticulum Ca\n 2+<\/jats:sup>\n load or plasma membrane Ca\n 2+<\/jats:sup>\n fluxes.\n <\/jats:p>\n <\/jats:list-item>\n \n \n We propose that impaired Ca\n 2+<\/jats:sup>\n signalling plays a key role in the earliest phases of the etiology of NAFLD, and is responsible for many of the ensuing metabolic and related dysfunctional outcomes at the cellular and whole tissue level.\n <\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:p>\n 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