PLSCR3, also named as PLS3, belongs to the phospholipid scramblase family. It may mediate accelerated ATP-independent bidirectional transbilayer migration of phospholipids upon binding calcium ions that results in a loss of phospholipid asymmetry in the plasma membrane. PLSCR3 may play a central role in the initiation of fibrin clot formation, in the activation of mast cells and in the recognition of apoptotic and injured cells by the reticuloendothelial system. It is a target of protein kinase C-δ (PKC-δ), resides in mitochondria and plays pivotal roles in regulating apoptotic response. Phosphorylation of PLSCR3 by PKC-δ is involved in the hyperthermia-induced apoptotic signal transduction pathway in Tca8113 cells, and that Hsp27 blocks this pathway to suppress hyperthermia-induced apoptosis. (PMID:20569108)