0000000000206498

AUTHOR

Joerg Heeren

showing 2 related works from this author

Lipoprotein lipase-facilitated uptake of LDL is mediated by the LDL receptor

2007

LPL mediates the uptake of lipoproteins into different cell types independent of its catalytic activity. The mechanism of this process and its physiological relevance are not clear. Taking into account the importance of the endothelial barrier for lipoprotein uptake, in vitro studies with primary aortic endothelial cells from wild-type and low density lipoprotein receptor (LDLR)-deficient (LDLR(-/-)) mice were performed. Addition of LPL almost doubled the uptake of LDL into wild-type cells. However, there was virtually no LPL-mediated change of LDL uptake into LDLR(-/-) cells. Upregulation of LDLR by lipoprotein-deficient serum/lovastatin in wild-type cells resulted in a 7-fold increase of …

Malemedicine.medical_specialtyendotheliumQD415-436BreedingBiochemistrylipidschemistry.chemical_compoundMiceEndocrinologyChylomicron remnantInternal medicinemedicineAnimalscardiovascular diseasesMuscle SkeletalCells CulturedLipoprotein lipaseCholesteroldigestive oral and skin physiologyEndothelial Cellsfood and beveragesnutritional and metabolic diseasescholesterolBiological TransportCell BiologyDietary FatsDietLipoproteins LDLMice Inbred C57BLLipoprotein LipaseEndocrinologychemistryBiochemistryReceptors LDLLow-density lipoproteinLDL receptortransportFemaleProteoglycanslipids (amino acids peptides and proteins)Lovastatinatherosclerosislow density lipoproteinmedicine.drugChylomicronLipoproteinJournal of Lipid Research
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Mice Expressing Only Covalent Dimeric Heparin Binding-deficient Lipoprotein Lipase

2004

Lipoprotein lipase (LpL) hydrolyzes triglycerides of circulating lipoproteins while bound as homodimers to endothelial cell surface heparan sulfate proteoglycans. This primarily occurs in the capillary beds of muscle and adipose tissue. By creating a mouse line that expresses covalent dimers of heparin-binding deficient LpL (hLpLHBM-Dimer) in muscle, we confirmed in vivo that linking two LpL monomers in a head to tail configuration creates a functional LpL. The hLpLHBM-Dimer transgene produced abundant activity and protein in muscle, and the LpL was the expected size of a dimer (approximately 110 kDa). Unlike the heparin-binding mutant monomer, hLpLHBM-Dimer had the same stability as nonmut…

Lipoprotein lipaseCOS cellsChemistryTransgenedigestive oral and skin physiologynutritional and metabolic diseasesAdipose tissueCell BiologyTransfectionBiochemistryMolecular biologyEndothelial stem cellBiochemistrylipids (amino acids peptides and proteins)SecretionBinding siteMolecular BiologyJournal of Biological Chemistry
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