Rabbit and rat C-reactive proteins bind apolipoprotein B-containing lipoproteins.
Open Access
- 1 February 1984
- journal article
- research article
- Published by Rockefeller University Press in The Journal of Experimental Medicine
- Vol. 159 (2), 604-616
- https://doi.org/10.1084/jem.159.2.604
Abstract
Immobilized rabbit and rat C-reactive protein (CRP) selectively bound apolipoprotein B (apoB)-containing lipoproteins (low density lipoprotein, LDL and very low density lipoprotein, VLDL) from whole serum in a manner similar to that previously reported with human CRP. In acute phase human serum the CRP is in a free form, not complexed with lipoprotein or any other macromolecular ligand, and in acute phase serum from most rabbits fed on a normal diet the rabbit CRP was also free. In acute phase serum or heparinized plasma from hypercholesterolemic rabbits part or all of the CRP was found by gel filtration and immunoelectrophoretic techiques to be complexed with .beta.-VLDL, an abnormal apoB-containing plasma lipoprotein present in these animals. The presence of extent in different serum samples of CRP complexed with lipoprotein correlated closely with the serum apoB concentration. The formation of complexes between native, unaggregated rabbit CRP in solution and apoB-containing lipoproteins was readily demonstrable experimentally both with the isolated proteins and in whole serum. In all cases these interactions were Ca-dependent and inhibitable by free phosphorylcholine. The findings indicate that among the C-reactive proteins from different species, which are structurally highly conserved, the capacity for selective binding to apoB-containing plasma lipoproteins is also a constant feature. These interactions may be related to the in vivo function of CRP in all species and this function may in turn be related to the in vivo function of cRP in all species and this function may in turn be relevant to pathological conditions, such as atherosclerosis, in which lipoproteins are important.This publication has 24 references indexed in Scilit:
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