Effects of a High Cholesterol–Oil Diet for Rabbits on Concentrations of Heparin and Total Sulfated Mucopolysaccharide in Aorta and Other Tissues Measured by Microelectrophoresis

1974 ◽  
Vol 52 (3) ◽  
pp. 661-668 ◽  
Author(s):  
T. K. Sue ◽  
L. B. Jaques

Rabbits were fed a high cholesterol–oil diet for 13 weeks. The amounts of total sulfated mucopolysaccharides and heparin in aorta, heart, skin, and small and large intestine were determined by microelectrophoresis. Aortic lipoprotein lipase activity, serum cholesterol, and triglycerides were also measured. The results showed that quantities of total sulfated mucopolysaccharides, heparin, and lipoprotein lipase activity increased markedly in aortas but were without change in other tissues in the rabbits on the experimental diet. There was a high correlation between lipoprotein lipase activity and concentrations of both heparin and total sulfated mucopolysaccharides in aorta, and also between concentrations of heparin and total sulfated mucopolysaccharides in aorta and serum levels of triglyceride and cholesterol.

1992 ◽  
Vol 33 (9) ◽  
pp. 1343-1349
Author(s):  
H Masuno ◽  
EJ Blanchette-Mackie ◽  
CJ Schultz ◽  
AE Spaeth ◽  
RO Scow ◽  
...  

1978 ◽  
Vol 176 (3) ◽  
pp. 865-872 ◽  
Author(s):  
P Ashby ◽  
D P Bennett ◽  
I M Spencer ◽  
D S Robinson

Changes in adipose-tissue lipoprotein lipase activity that are independent of protein synthesis were investigated in an incubation system in vitro. Under appropriate conditions at 25 degrees C a progressive increase in the enzyme activity occurs that is energy-dependent. Part of the enzyme is rapidly inactivated when the tissue is incubated with adrenaline or adrenaline plus theophylline. The mechanism of this inactivation appears to be distinct from, and to follow, the activation of the enzyme. A hypothesis is presented to account for the results in terms of an activation of the enzyme during obligatory post-translational processing and a catecholamine-regulated inactivation of the enzyme as an alternative to secretion from the adipocyte.


1986 ◽  
Vol 251 (4) ◽  
pp. E470-E476 ◽  
Author(s):  
G. J. Bagby ◽  
C. B. Corll ◽  
J. J. Thompson ◽  
L. A. Wilson

The conditions under which lipoprotein lipase-suppressing mediator is present in serum of endotoxin-treated rats was determined in this study. The suppression of lipoprotein lipase activity in 3T3-L1 cells was used as a bioassay for mediator in serum. Endotoxin (0.1-10 micrograms/ml) and serum from control rats did not suppress lipoprotein lipase activity. Maximum suppression of cell lipoprotein lipase activity (70%) by serum from endotoxic rats required a cell exposure time of 5 h. At the highest dose of endotoxin used (1 mg/100 g), significant suppression was achieved when cells were incubated with 0.5% serum from endotoxic rats (P less than 0.05). Serum obtained 2-3 h after endotoxin injection possessed the maximal ability to suppress lipase activity, but suppressing activity was not present in serum collected 8 h after endotoxin. Rats rendered tolerant to endotoxin by 5 daily injections (0.1 mg/100 g) did not contain detectable levels of mediator in serum after endotoxin injection. The results demonstrate that the presence of lipoprotein lipase activity-suppressing mediator is transitory after in vivo exposure of naive rats to endotoxin, but does not appear in serum of endotoxin tolerant rats.


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