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2. Plasma triglycerides cosegregate with erythrocyte sodium content in F2 rats of HTG x lewis cross
- Creator:
- Zicha, J., Dobešová, Z., and Kuneš, J.
- Type:
- article, model:article, and TEXT
- Subject:
- hereditary hypertriglyceridaemic rats, genetic hypertension, plasma triglycerides, plasma cholesterol, erythrocyte Na+ content, Na+ leak, Na+-K+ cotransport, and Na+-K+ pump
- Language:
- English
- Description:
- The possible association of plasma lipids (triglycerides and cholesterol) with erythrocyte Na+ content (Na+j) and/or with alterations in red cell Na+ and K+ (Rb+) transport was studied in a population of F2 hybrids obtained by crossing hypertensive Prague hereditary hypertriglyceridaemic (HTG) rats with normotensive Lewis rats. The obtained data indicated a strong cosegregation (p<0.001) of plasma triglycerides with erythrocyte Na+ content. This was the cause for the close correlation of plasma triglycerides with the Ma+-K+ pump activity (measured as ouabain-sensitive Na+ extrusion). On the contrary, there was only marginal association (p<0.05) of erythrocyte Na+ content with plasma cholesterol which was significantly (p<0.01) related to bumetanide-sensitive Rb+ uptake mediated by the Ma+-K+ cotransport system. Na+ leak (bumetanide-resistant net Na+ uptake) correlated positively with blood pressure in female but not in male F2 rats. The close association between plasma triglycerides and erythrocyte Na+ content suggests that ion transport alterations might contribute to mechanisms responsible for the cosegregation of blood pressure with plasma triglycerides in HTG x Lewis F2 hybrids.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. The control of cholesterol metabolism and plasma lipid levels in infant rats
- Creator:
- Hahn, P. and Mahler, L.
- Type:
- article, model:article, and TEXT
- Subject:
- plasma cholesterol, plasma lipids, infant rats, plasma insulin, glucagon, and 3-hydroxy-3-glutaryl CoA reductase
- Language:
- English
- Description:
- Infant rats received an i. p. injection of insulin, anti-insulin serum, streptozotocin, antiglucagon serum or dexamethazone. All substances except the antiinsulin serum, raised the plasma triglyceride level. Both antisera decreased plasma cholesterol levels, while streptozotocin, insulin and dexametazone caused an increase. The activity of 3-hydroxy-3-glutaryl CoA reductase in liver and brown adipose tissue changed inversely to the cholesterol level. However, small intestinal enzyme activity was increased by insulin administration inspite of the rise in plasma cholesterol.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public