Read e-book online Advances in lipid research. / Volume 19 PDF

By Rodolfo Paoletti, Dr. David Kritchevsky

ISBN-10: 0120249197

ISBN-13: 9780120249190

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The synthesis of GAG in third-passage aortic smooth muscle cells that were initially obtained from normal and atherosclerotic rabbits was reported by Pietila et al. (1980). Their results, presented only for secreted GAG, showed that [14C]glucosamine incorporation was higher in the sulfated GAG secreted by cells from atherosclerotic aorta than in controls; DS was the fraction that increased most. We can only speculate about the immediate causes for this alteration in the metabolism of GAG, and probably PG, in cells originating from atherosclerotic tissue.

Also, the addition of LDL and HDL reduced the glucose incorporation. The authors attributed the reduction to some direct effect of the lipoproteins, both in vivo and in the tissue segments. However, they did not indicate the level of hyperlipidemia achieved after feeding cholesterol to the rats. Aortic segments of intima-media have been used by Vijayagopal et al. (1980a) to study the synthesis and secretion of proteoglycans. Fractionation of the medium PG and tissue PG showed that the rate of incorporation of [35S]sulfate followed the order heparan sulfate > chondroitin sulfate > dermatan sulfate for the secreted PG.

The duodenal factor was a very efficient inhibitor of the proteoglycan-lipoprotein complex formation. There are still many aspects of the multiple and possibly competitive interactions of lipoproteins with soluble and structural proteoglycans that remain to be clarified, especially those concerning the effect of different metabolic and pathological states on the level and structure of plasma and arterial GAG and PG. This appears as a research line that may even have an important therapeutic outcome.

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Advances in lipid research. / Volume 19 by Rodolfo Paoletti, Dr. David Kritchevsky


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