Apolipoprotein C-I (ApoC-1) is a water-soluble protein component of plasma lipoprotein. It solubalises lipids and regulates lipid metabolism. ApoC-1 transfers among HDL (high density lipoprotein), VLDL (very low-density lipoprotein) and chylomicrons. ApoC-1 activates lecithin:choline acetyltransferase (LCAT), inhibits cholesteryl ester transfer protein, can inhibit hepatic lipase and phospholipase 2 and can stimulate cell growth. ApoC-1 delays the clearance of beta-VLDL by inhibiting its uptake via the LDL receptor-related pathway [1]. ApoC-1 has been implicated in hypertriglyceridemia [2], and Alzheimer's disease [3].

1: Solution conformation of human apolipoprotein C-1 inferred from proline mutagenesis: far- and near-UV CD study. Gursky O; Biochemistry 2001;40:12178-12185. PMID:11580293

2: Apolipoproteins C-I and C-III as important modulators of lipoprotein metabolism. Shachter NS; Curr Opin Lipidol 2001;12:297-304. PMID:11353333

3: Apolipoprotein C-I expression in the brain in Alzheimer's disease. Petit-Turcotte C, Stohl SM, Beffert U, Cohn JS, Aumont N, Tremblay M, Dea D, Yang L, Poirier J, Shachter NS; Neurobiol Dis 2001;8:953-963. PMID:11741391