TY - JOUR
T1 - Chylomicronemia With a Mutant GPIHBP1 (Q115P) That Cannot Bind Lipoprotein Lipase
AU - Beigneux, Anne P.
AU - Franssen, Remco
AU - Bensadoun, André
AU - Gin, Peter
AU - Melford, Kristan
AU - Peter, Jorge
AU - Walzem, Rosemary L.
AU - Weinstein, Michael M.
AU - Davies, Brandon S. J.
AU - Kuivenhoven, Jan A.
AU - Kastelein, John J. P.
AU - Fong, Loren G.
AU - Dallinga-Thie, Geesje M.
AU - Young, Stephen G.
PY - 2009
Y1 - 2009
N2 - Objective-GPIHBP1 is an endothelial cell protein that binds lipoprotein lipase (LPL) and chylomicrons. Because GPIHBP1 deficiency causes chylomicronemia in mice, we sought to determine whether some cases of chylomicronemia in humans could be attributable to defective GPIHBP1 proteins. Methods and Results-Patients with severe hypertriglyceridemia (n = 60, with plasma triglycerides above the 95th percentile for age and gender) were screened for mutations in GPIHBP1. A homozygous GPIHBP1 mutation (c. 344A > C) that changed a highly conserved glutamine at residue 115 to a proline ( p. Q115P) was identified in a 33-year-old male with lifelong chylomicronemia. The patient had failure-to-thrive as a child but had no history of pancreatitis. He had no mutations in LPL, APOA5, or APOC2. The Q115P substitution did not affect the ability of GPIHBP1 to reach the cell surface. However, unlike wild-type GPIHBP1, GPIHBP1-Q115P lacked the ability to bind LPL or chylomicrons (d <1.006 g/mL lipoproteins from Gpihbp1(-/-) mice). Mouse GPIHBP1 with the corresponding mutation (Q114P) also could not bind LPL. Conclusions-A homozygous missense mutation in GPIHBP1 (Q115P) was identified in a patient with chylomicronemia. The mutation eliminated the ability of GPIHBP1 to bind LPL and chylomicrons, strongly suggesting that it caused the patient's chylomicronemia. (Arterioscler Thromb Vasc Biol. 2009; 29: 956-962.)
AB - Objective-GPIHBP1 is an endothelial cell protein that binds lipoprotein lipase (LPL) and chylomicrons. Because GPIHBP1 deficiency causes chylomicronemia in mice, we sought to determine whether some cases of chylomicronemia in humans could be attributable to defective GPIHBP1 proteins. Methods and Results-Patients with severe hypertriglyceridemia (n = 60, with plasma triglycerides above the 95th percentile for age and gender) were screened for mutations in GPIHBP1. A homozygous GPIHBP1 mutation (c. 344A > C) that changed a highly conserved glutamine at residue 115 to a proline ( p. Q115P) was identified in a 33-year-old male with lifelong chylomicronemia. The patient had failure-to-thrive as a child but had no history of pancreatitis. He had no mutations in LPL, APOA5, or APOC2. The Q115P substitution did not affect the ability of GPIHBP1 to reach the cell surface. However, unlike wild-type GPIHBP1, GPIHBP1-Q115P lacked the ability to bind LPL or chylomicrons (d <1.006 g/mL lipoproteins from Gpihbp1(-/-) mice). Mouse GPIHBP1 with the corresponding mutation (Q114P) also could not bind LPL. Conclusions-A homozygous missense mutation in GPIHBP1 (Q115P) was identified in a patient with chylomicronemia. The mutation eliminated the ability of GPIHBP1 to bind LPL and chylomicrons, strongly suggesting that it caused the patient's chylomicronemia. (Arterioscler Thromb Vasc Biol. 2009; 29: 956-962.)
U2 - https://doi.org/10.1161/ATVBAHA.109.186577
DO - https://doi.org/10.1161/ATVBAHA.109.186577
M3 - Article
C2 - 19304573
SN - 1079-5642
VL - 29
SP - 956-U447
JO - Arteriosclerosis, Thrombosis, and Vascular Biology
JF - Arteriosclerosis, Thrombosis, and Vascular Biology
IS - 6
ER -