Metabolism of oxidized and chemically modified low density lipoproteins in rainbow trout--clearance via scavenger receptors.
Oxidative modifications of low density lipoprotein (LDL) convert LDL into a ligand recognized by a variety of scavenger receptors (SR) in mammals. This oxidized LDL (oxLDL) activate several cell types, and have been shown to induce expression of a variety of genes in mammals. Lipoproteins of poikilothermic animals like salmonid fishes contain high levels of polyunsaturated fatty acids susceptible to oxidative modifications. We have investigated, and found trout LDL to be susceptible to oxidation in the presence of Cu(2+). When oxidized or acetylated trout LDL was injected intravenously, the clearance rate was increased compared to that of native LDL. Modified LDL was taken up almost exclusively in the kidney, whereas native LDL was also taken up in the liver. Uptake of both oxLDL and acetylated LDL in the kidney was significantly inhibited by lipoteichoic acid (LTA) and formaldehyde treated BSA (fBSA), both of which are known ligands of SR.
Frøystad
Marianne K
MK
School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, 0316 Oslo, Norway.
Volden
Vivi
V
Berg
Trond
T
Gjøen
Tor
T
D000107:Acetylation; D000818:Animals; D002413:Cations, Divalent; D003300:Copper / Q000737:chemistry; D005557:Formaldehyde; D007668:Kidney / Q000378:metabolism; D008077:Lipoproteins, LDL / Q000737:chemistry / Q000378:metabolism* / Q000493:pharmacokinetics; D008565:Membrane Proteins; D017686:Oncorhynchus mykiss / Q000378:metabolism*; D010084:Oxidation-Reduction; D011971:Receptors, Immunologic / Q000378:metabolism; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; D051122:Scavenger Receptors, Class B; D012710:Serum Albumin, Bovine / Q000737:chemistry; D014018:Tissue Distribution
D002413:Cations, Divalent; D008077:Lipoproteins, LDL; D008565:Membrane Proteins; D011971:Receptors, Immunologic; D018110:Receptors, Lipoprotein; D051116:Receptors, Scavenger; C454739:Scarb1 protein, mouse; D051122:Scavenger Receptors, Class B; C032629:acetyl-LDL; C099252:oxidized low density lipoprotein; D005557:Formaldehyde; D012710:Serum Albumin, Bovine; D003300:Copper