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  • Title: [Studies on stroke-prone spontaneously hypertensive rats (SHRSP) fed a high-fat and high-cholesterol diet--changes in serum concentrations and distributions of apolipoproteins A-I, A-IV and E].
    Author: Ogawa H, Nishikawa T, Fukushima S, Sasagawa S.
    Journal: Nihon Eiseigaku Zasshi; 1989 Jun; 44(2):622-30. PubMed ID: 2509768.
    Abstract:
    The effects of a high-fat and high-cholesterol diet (HFC diet) on serum lipoproteins and apolipoproteins were studied in stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive Kyo: Wistar rats (WKY). In particular, the changes in serum concentrations and distributions among lipoprotein fractions of apolipoproteins A-I, A-IV and E (apo A-I, A-IV and E) were investigated in detail. These apolipoproteins are the main protein constituents of high density lipoprotein (HDL) which is considered to be an anti-atherogenic factor and accounts for a large part of the serum lipoproteins in the rat. Serum lipoprotein fractions were isolated by stepwise density-gradient ultracentrifugation. The alterations in lipoprotein fractions and apolipoproteins in lipoprotein fractions were roughly estimated by native gradient polyacrylamide gel electrophoresis and sodium dodecyl sulfate (SDS)-gradient polyacrylamide gel electrophoresis. Next, the concentrations of apo A-I, A-IV and E in serum, serum lipoprotein fractions and serum lipoprotein-free fraction were measured by rocket immunoelectrophoresis according to the method of Laurell as modified by us. Cholesterol was enzymatically determined by a commercially available kit. The results obtained were as follows: 1) A remarkable increase in the very low density lipoprotein (VLDL) and intermediate density lipoprotein (IDL) fractions was observed in WKY and SHRSP. This was associated with a remarkable increase in the cholesterol and apo B contents and with a significant increase in the apo E content. These changes in the VLDL and IDL fractions were more drastic in SHRSP than in WKY, which suggests the promotive effect of hypertension in SHRSP on the production of VLDL and IDL fractions.(ABSTRACT TRUNCATED AT 250 WORDS)
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