Hepatocellular calcium signaling machinery

The hepatocellular calcium signaling machinery is a complex network of proteins responsible for maintaining and utilizing calcium (Ca2+) as a second messenger to regulate liver-specific functions. Key components include the Inositol 1,4,5-trisphosphate receptor (IP3R) and Ryanodine receptor (RyR) for ER calcium release, the Sarco/endoplasmic reticulum Ca2+-ATPase (SERCA) for calcium reuptake, and Store-operated calcium entry (SOCE) mediated by STIM1 and Orai1 (Nathanson, 2022, Hepatology; Oliva-Vilarnau et al., 2018, Cell Calcium). This machinery orchestrates vital processes such as glucose and lipid metabolism, bile secretion, and hepatocyte regeneration (St-Pierre et al., 2016, Journal of Hepatology). In pathological states like hepatocellular carcinoma (HCC), the machinery is often remodeled, with upregulated SOCE components driving tumor cell proliferation, migration, and survival (Guéguinou et al., 2014, Oncotarget). While drugs like Sorafenib have been shown to indirectly affect this machinery by inducing ER stress and altering calcium flux, the system's broad physiological importance makes it a challenging therapeutic target (Zhang et al., 2017, Cancer Research). Therapeutic strategies often focus on specific components, such as Orai1 inhibitors, to achieve more selective modulation of the pathway in disease states.

Other names

Hepatic calcium signaling systemHepatocyte calcium toolkitLiver calcium signaling pathway

Modulation of intracellular calcium levels through the regulation of endoplasmic reticulum release channels, plasma membrane entry channels, and active transport pumps.