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angiopoietin-like protein 3
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i.e. Angptl3, human, commercial preparation of recombinant enzyme, inhibits LPL activity in vitro and in vivo, structural basis for inhibition, overview. The highly conserved motif LAXGLLXLGXGL, where X represents polar amino acid residues, corresponding to amino acid residues 46-57 within the NH2-terminal coiled-coil domain, confers its inhibitory effects on lipoprotein lipase
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angiopoietin-like protein 4
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i.e. Angptl4, human, recombinantly expressed in Escherichia coli. It inhibits LPL activity in vitro and in vivo. The highly conserved motif LAXGLLXLGXGL, where X represents polar amino acid residues, corresponding to amino acid residues 44-55 within the NH2-terminal coiled-coil domain, confers its inhibitory effects on lipoprotein lipase, involving amino acid residues His46, Gln50, and Gln53, by disrupting the enzyme dimerization, overview. Structural basis for inhibition, overview. Mutants H46A, Q50A, and Q53A are not active against the enzyme
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angiopoietin-like protein-4
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-
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ANGPTL4
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conventional, non-competitive inhibitor
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heat-inactivated rat serum
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heat-inactivated rat serum added from 0-10%, decreases the enzyme activity by 12%. HIS also contains lipoprotein lipase-inhibitory factors such as angiopoietin-like protein-3, angiopoietin-like protein-4, apoC-I, and apoC-III
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NaCl
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1 M NaCl inhibits the reaction with triolein by 80%, but there is no inhibition of lipoprotein lipase activity by NaCl if apoC-II is not used in the assay
tetrahydrolipstatin
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active-site inhibitor
additional information
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protein kinase Calpha depletion inhibits LPL translation through protein kinase A activation, LPL translational inhibition occurs through an RNA-binding complex involving protein kinase A subunits and A-kinase-anchoring protein 121, LPL is also translationally repressed following depletion of cellular protein kinase C either through prolonged treatment with phorbol esters or through the use of antisense oligonucleotides to protein kinase Calpha
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malfunction
lipoprotein lipase (LPL)-deficient cells show dramatically reduced expression of anti-inflammatory markers, YM1, and arginase 1 and increased expression of pro-inflammatory markers, such as iNOS compared to wild-type cells. LPL is increased during the onset of remyelination, which is associated with an anti-inflammatory reparative microglial phenotype, and may facilitate the uptake of myelin-derived lipids in the CNS
physiological function
lipasin/Angptl8 monoclonal antibody lowers mouse serum triglycerides involving increased postprandial activity of the cardiac lipoprotein lipase. Lipasin/Angptl8 is a feeding-induced hepatokine that regulates triglyceride (TAG) metabolism. Lipasin-deficient mice exhibit elevated postprandial activity of LPL in the heart and skeletal muscle, but not in white adipose tissue, suggesting that lipasin suppresses the activity of LPL specifically in cardiac and skeletal muscles. During fasting, LPL activity is upregulated in the heart and skeletal muscle, which, in turn, take up fatty acids for energy production. In the fed state, LPL activity is upregulated in white adipose tissue, which, in turn, takes up fatty acids for storage
physiological function
lipoprotein lipase is a feature of alternatively-activated microglia, reparative microglia cells, and may facilitate lipid uptake in the CNS during demyelination. Lipoprotein lipase is involved in microglial lipid uptake. LPL may support repair through the clearance of myelin-derived lipids. Lipoprotein lipase (LPL) is the rate-limiting enzyme in the hydrolysis of triglyceride-rich lipoproteins and is increased in Schwann cells and macrophages following nerve crush injury in the peripheral nervous system (PNS), suggesting that LPL may help scavenge myelin-derived lipids. Role of LPL in microglia, overview
malfunction
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lipoprotein lipase knock-out mice die 18 h after birth, probably because of hypoglycemia
malfunction
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selective loss of adipocyte enzyme in mice leads to mild hypertriglyceridemia. Enzyme-deficient mice display a profound increase in de novo lipogenesis-fatty acids, especially palmitoleate and myristoleate in brown adipose tissue and white adipose tissue depots while essential dietary fatty acids are markedly decreased. High fat diet-fed enzyme-deficient mice exhibit less adiposity and improved plasma adipokines but not increased glucose tolerance
metabolism
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the phosphoinositide-3-kinase pathway is involved in the regulation of LPL gene transcription through Sp1/Sp3, signalling pathways that impact on the IFN-mediated regulation of Sp1/Sp3 binding and LPL gene transcription in macrophages, overview. The synergism between IFN- and TNF- on LPL gene transcription is not mediated at the level of Sp1/Sp3 DNA binding
metabolism
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lipoprotein lipase is a major enzyme in lipid metabolism responsible for the hydrolysis of the core triglycerides in chylomicrons and very low density lipoprotein and subsequent release of free fatty acids
physiological function
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lipoprotein lipase is a principal enzyme responsible for the clearance of chylomicrons and very low density lipoproteins from the bloodstream. The activity of LPL is tightly modulated by multiple mechanisms in a tissue-specific manner in response to nutritional changes
physiological function
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lipoprotein lipase LPL expressed in placenta facilitates uptake of retinoids by this organ and their transfer to the embryo, mainly through its catalytic activity. In addition, LPL can mediate the acquisition of nascent chylomicrons by the placenta, although less efficiently. Placental LPL acts in concert with low density lipoprotein receptor and LRP1
physiological function
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the enzyme is rate limiting for plasma triglyceride clearance and tissue uptake of fatty acids
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