Biomaterial Database

The effect of portacaval shunt on plasma lipids and tissue cholesterol synthesis in the dog. 1976

J J Coyle, and M Z Schwartz, and A T Marubbio, and R L Varco, and H Buchwald

Portacaval shunt (PCS) has been proposed as a therapy for hyperlipidemia; however, its lipid-lowering mechanism is unknown. In this study PCS was performed on ten mongrel dogs to measure its effect on plasma lipids and on the cholesterol synthesizing ability of the liver and intestines, the major indodenous cholesterol synthesizing tissues. Plasma was analyzed for total cholesterol (CHOL), triglycerides (TG), and the CHOL content of three plasma lipoprotein fractions. Jejunal, ileal, and hepatic cholesterol synthetic rates were determined by 14C-acetate incorporation to CHOL in tissue slices obtained at operation before PCS and 44 +/- 4.1 (S.D.) days after PCS. Plasma CHOL decreased by 18 +/- 7 (S.E.), 34 +/- 8 (S.E.), and 57 +/- 14 (S.E.) mg. per 100 ml. by 4, 6, and 16 weeks after PCS, respectively. TG decreased by 13 +/- 5 (S.E.), 27 +/- 5 (S.E.), and 30 +/- 9 (S.E.) mg. per 100 ml. at corresponding time intervals. Paired Student's test analysis of CHOL and TG changes are significant at the p less than 0.05 level. CHOL content of the three plasma lipoprotein fractions decreased correspondingly. Intestinal tissue CHOL synthesis rates changed only slightly. Hepatic synthetic rates increased by 30 to 40%; however, no synthetic rate changes were statistically significant at the p less than 0.05 level. PCS is associated with decreased in plasma CHOL [42% (see article)] AND TG [53% (see article)] in dogs up to 16 weeks following operation. Statistically significant changes in endogenous CHOL synthesis were not demonstrated by this study. The mechanism by which PCS affects plasma lipids in the dog is unknown as yet.

UI	MeSH Term	Description	Entries
D008055	Lipids	A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed)	Lipid
D008075	Lipoproteins, HDL	A class of lipoproteins of small size (4-13 nm) and dense (greater than 1.063 g/ml) particles. HDL lipoproteins, synthesized in the liver without a lipid core, accumulate cholesterol esters from peripheral tissues and transport them to the liver for re-utilization or elimination from the body (the reverse cholesterol transport). Their major protein component is APOLIPOPROTEIN A-I. HDL also shuttle APOLIPOPROTEINS C and APOLIPOPROTEINS E to and from triglyceride-rich lipoproteins during their catabolism. HDL plasma level has been inversely correlated with the risk of cardiovascular diseases.	High Density Lipoprotein,High-Density Lipoprotein,High-Density Lipoproteins,alpha-Lipoprotein,alpha-Lipoproteins,Heavy Lipoproteins,alpha-1 Lipoprotein,Density Lipoprotein, High,HDL Lipoproteins,High Density Lipoproteins,Lipoprotein, High Density,Lipoprotein, High-Density,Lipoproteins, Heavy,Lipoproteins, High-Density,alpha Lipoprotein,alpha Lipoproteins
D008077	Lipoproteins, LDL	A class of lipoproteins of small size (18-25 nm) and light (1.019-1.063 g/ml) particles with a core composed mainly of CHOLESTEROL ESTERS and smaller amounts of TRIGLYCERIDES. The surface monolayer consists mostly of PHOSPHOLIPIDS, a single copy of APOLIPOPROTEIN B-100, and free cholesterol molecules. The main LDL function is to transport cholesterol and cholesterol esters to extrahepatic tissues.	Low-Density Lipoprotein,Low-Density Lipoproteins,beta-Lipoprotein,beta-Lipoproteins,LDL(1),LDL(2),LDL-1,LDL-2,LDL1,LDL2,Low-Density Lipoprotein 1,Low-Density Lipoprotein 2,LDL Lipoproteins,Lipoprotein, Low-Density,Lipoproteins, Low-Density,Low Density Lipoprotein,Low Density Lipoprotein 1,Low Density Lipoprotein 2,Low Density Lipoproteins,beta Lipoprotein,beta Lipoproteins
D008079	Lipoproteins, VLDL	A class of lipoproteins of very light (0.93-1.006 g/ml) large size (30-80 nm) particles with a core composed mainly of TRIGLYCERIDES and a surface monolayer of PHOSPHOLIPIDS and CHOLESTEROL into which are imbedded the apolipoproteins B, E, and C. VLDL facilitates the transport of endogenously made triglycerides to extrahepatic tissues. As triglycerides and Apo C are removed, VLDL is converted to INTERMEDIATE-DENSITY LIPOPROTEINS, then to LOW-DENSITY LIPOPROTEINS from which cholesterol is delivered to the extrahepatic tissues.	Pre-beta-Lipoprotein,Prebeta-Lipoprotein,Prebeta-Lipoproteins,Very Low Density Lipoprotein,Very-Low-Density Lipoprotein,Very-Low-Density Lipoproteins,Lipoprotein VLDL II,Lipoproteins, VLDL I,Lipoproteins, VLDL III,Lipoproteins, VLDL1,Lipoproteins, VLDL2,Lipoproteins, VLDL3,Pre-beta-Lipoproteins,Lipoprotein, Very-Low-Density,Lipoproteins, Very-Low-Density,Pre beta Lipoprotein,Pre beta Lipoproteins,Prebeta Lipoprotein,Prebeta Lipoproteins,VLDL Lipoproteins,VLDL1 Lipoproteins,VLDL2 Lipoproteins,VLDL3 Lipoproteins,Very Low Density Lipoproteins
D008099	Liver	A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.	Livers
D011167	Portacaval Shunt, Surgical	Surgical portasystemic shunt between the portal vein and inferior vena cava.	Eck Fistula,Portacaval Anastomosis,Portacaval Shunt,Shunt, Surgical Portacaval,Surgical Portacaval Shunt,Anastomoses, Portacaval,Anastomosis, Portacaval,Fistula, Eck,Portacaval Anastomoses,Portacaval Shunts,Portacaval Shunts, Surgical,Shunt, Portacaval,Shunts, Portacaval,Shunts, Surgical Portacaval,Surgical Portacaval Shunts
D002784	Cholesterol	The principal sterol of all higher animals, distributed in body tissues, especially the brain and spinal cord, and in animal fats and oils.	Epicholesterol
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia