Leucine-rich repeat-containing protein 8A (LRRC8A)

Leucine-rich repeat-containing protein 8A (LRRC8A) is an essential subunit of the volume-regulated anion channel (VRAC), a hexameric, plasma membrane ion channel responsible for controlling cell volume by transporting chloride ions and organic osmolytes in response to osmotic changes[1][5][7]. LRRC8A is ubiquitously expressed, with particularly important roles in the immune system, where its deficiency may cause agammaglobulinemia and impair T- and B-cell development[3][7]. Structurally, LRRC8A has four transmembrane domains and a large intracellular C-terminal region composed of leucine-rich repeats known to facilitate protein-protein interactions and possibly contribute to ligand recognition, cell signaling, and innate immune responses[1][7]. LRRC8A assembles with other LRRC8 isoforms (B–E) in a cell type–specific manner, and its proper assembly and function are critical for VRAC activity, cell survival under osmotic stress, and immune cell homeostasis[1][5][7]. Disruption of LRRC8A or VRAC function has been linked to immunodeficiency, infertility, kidney pathology, and may affect cancer or inflammation responses[1][3][5]. VRAC agonists and inhibitors are under research as potential modulators of immune function and cancer therapy, but no clinically approved drugs are specific for LRRC8A to date[1].

Other names

LRRC8ASWELL1AGM5Leucine-rich repeat containing 8 family member ALeucine-rich repeat containing 8 VRAC subunit AHsLRRC8A[5]

Inhibition or activation of VRAC modulates anion flux, cell volume, and immune cell signaling[1][3]\nModulation affects immune responses and may alter cancer or inflammatory disease phenotypes[1]