Post-transcriptional regulation of 3-hydroxy-3-methylglutaryl coenzyme A reductase and cholesterol 7 alpha-hydroxylase in rats with subtotal nephrectomy. 1994

W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
Department of Medicine, Medical College of Virginia, Richmond.

Chronic renal failure is associated with hyperlipidemia and atherosclerosis. The mechanism responsible for the observed increase of serum cholesterol in chronic renal disease is not certain. The objective of the present study was to characterize the effect of induced renal failure on 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) and cholesterol 7 alpha-hydroxylase, the two rate determining enzymes of the cholesterol and bile acid biosynthetic pathways, respectively. Studies were carried out in rats with subtotal (75%) nephrectomy, which resulted in a marked elevation of blood urea nitrogen (371 +/- 44% of control, P < 0.001), and was accompanied by significant increases in the levels of serum cholesterol (133 +/- 7%, P < 0.005) and triglycerides (185 +/- 25, P < 0.01). In nephrectomized rats, an increase in the specific activity of HMG-CoA reductase (219 +/- 30% above control levels, P < 0.02) was observed. This increase occurred in the presence of elevated hepatic microsomal cholesterol concentrations (150 +/- 13% of controls, P < 0.01). Surprisingly, the increase in HMG-CoA reductase specific activity was not associated with parallel increases in HMG-CoA reductase steady-state mRNA levels and gene transcriptional activity. These uremic rats also exhibited a marked increase in the specific activity of cholesterol 7 alpha-hydroxylase (240 +/- 559% of controls, P < 0.05). There was no concomitant increase in cholesterol 7 alpha-hydroxylase steady-state mRNA levels or gene transcriptional activity. The factors responsible for the observed increases in HMG-CoA reductase and cholesterol 7 alpha-hydroxylase specific activity in renal failure remain to be determined.(ABSTRACT TRUNCATED AT 250 WORDS)

UI MeSH Term Description Entries
D007676 Kidney Failure, Chronic The end-stage of CHRONIC RENAL INSUFFICIENCY. It is characterized by the severe irreversible kidney damage (as measured by the level of PROTEINURIA) and the reduction in GLOMERULAR FILTRATION RATE to less than 15 ml per min (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002). These patients generally require HEMODIALYSIS or KIDNEY TRANSPLANTATION. ESRD,End-Stage Renal Disease,Renal Disease, End-Stage,Renal Failure, Chronic,Renal Failure, End-Stage,Chronic Kidney Failure,End-Stage Kidney Disease,Chronic Renal Failure,Disease, End-Stage Kidney,Disease, End-Stage Renal,End Stage Kidney Disease,End Stage Renal Disease,End-Stage Renal Failure,Kidney Disease, End-Stage,Renal Disease, End Stage,Renal Failure, End Stage
D008297 Male Males
D008862 Microsomes, Liver Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough. Liver Microsomes,Liver Microsome,Microsome, Liver
D009392 Nephrectomy Excision of kidney. Heminephrectomy,Heminephrectomies,Nephrectomies
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
D002790 Cholesterol 7-alpha-Hydroxylase A membrane-bound cytochrome P450 enzyme that catalyzes the 7-alpha-hydroxylation of CHOLESTEROL in the presence of molecular oxygen and NADPH-FERRIHEMOPROTEIN REDUCTASE. This enzyme, encoded by CYP7, converts cholesterol to 7-alpha-hydroxycholesterol which is the first and rate-limiting step in the synthesis of BILE ACIDS. CYP7,CYP7A,Cytochrome P-450 CYP7,CYP 7,CYP 7A,Cholesterol 7-alpha-Monooxygenase,Cholesterol 7alpha-Hydroxylase,Cholesterol-7-Hydroxylase,Cytochrome P450 7,Cholesterol 7 Hydroxylase,Cholesterol 7 alpha Hydroxylase,Cholesterol 7 alpha Monooxygenase,Cholesterol 7alpha Hydroxylase,Cytochrome P 450 CYP7
D006903 Hydroxymethylglutaryl CoA Reductases Enzymes that catalyze the reversible reduction of alpha-carboxyl group of 3-hydroxy-3-methylglutaryl-coenzyme A to yield MEVALONIC ACID. HMG CoA Reductases,3-Hydroxy-3-methylglutaryl CoA Reductase,HMG CoA Reductase,Hydroxymethylglutaryl CoA Reductase,3 Hydroxy 3 methylglutaryl CoA Reductase,CoA Reductase, 3-Hydroxy-3-methylglutaryl,Reductase, 3-Hydroxy-3-methylglutaryl CoA
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
D001646 Bile An emulsifying agent produced in the LIVER and secreted into the DUODENUM. Its composition includes BILE ACIDS AND SALTS; CHOLESTEROL; and ELECTROLYTES. It aids DIGESTION of fats in the duodenum. Biliary Sludge,Sludge, Biliary
D012333 RNA, Messenger RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated

Related Publications

W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
February 1995, Archives of biochemistry and biophysics,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
November 2003, Biochimica et biophysica acta,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
July 1979, Steroids,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
June 1972, The Biochemical journal,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
October 1992, Comparative biochemistry and physiology. Comparative physiology,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
May 1971, The Journal of biological chemistry,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
June 1992, The Journal of biological chemistry,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
January 1983, Molecular and cellular biochemistry,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
January 1995, Archives of biochemistry and biophysics,
W M Pandak, and Z R Vlahcevic, and D M Heuman, and R J Krieg, and J D Hanna, and J C Chan
May 1993, The Journal of biological chemistry,
Copied contents to your clipboard!