Tumor necrosis factor-alpha (TNFalpha) promotes oxidation of branched-chain amino acids (BCAA). BCAA catabolism is regulated by branched-chain alpha-keto acid dehydrogenase (BCKDH) complex, which is regulated by phosphorylation-dephosphorylation of the E1alpha subunit at Ser293. BCKDH kinase is responsible for inactivation of the complex by phosphorylation. In the present study, we examined the effects of TNFalpha administration on hepatic BCKDH complex and kinase in rats. Rats were intravenously administered with 25 or 50 microg TNFalpha/kg body weight 4 h prior to sacrifice. The TNFalpha treatment at both doses elevated the activity state (percentage of the active form) of BCKDH complex from 22% to 69% and 86%, respectively, and the amount of phospho-Ser293 on the E1alpha subunit in each group of rats corresponded inversely to the activity state of BCKDH complex. The TNFalpha treatment of rats significantly decreased the activity as well as the bound form of BCKDH kinase. These results suggest that the decrease in the bound form of kinase is involved in the mechanism responsible for TNFalpha-induced activation of the BCKDH complex.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.bbrc.2005.01.047 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comprehensive Iranian guidelines for the diagnosis and management of maple syrup urine disease: an evidence- and consensus- based approach.
Orphanet J Rare Dis
January 2025
Pediatric Endocrinologist, Metabolic Disorders Research Center, Molecular-cellular Endocrinology & Metabolism Research Institute, Tehran University of medical Sciences, Tehran, Iran.
Maple Syrup Urine Disease (MSUD) disease is a defect in the function of the Branched-chain 2-ketoacid dehydrogenase complex (BCKDH). It is caused by pathogenic biallelic variants in BCKDHA, BCKA decarboxylase, or dihydrolipoamide dehydrogenase. The brain is the major organ involved in MSUD.
View Article and Find Full Text PDFDephosphorylation of branched-chain α-keto acid dehydrogenase E1α (BCKDHA) promotes branched-chain amino acid catabolism and renders cancer cells resistant to X-rays by mitigating DNA damage.
Biochem Biophys Res Commun
January 2025
Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Japan.
Branched-chain amino acids (BCAAs) facilitate cancer cell proliferation and survival. Stresses, including X-irradiation, increase BCAA uptake. However, the role of BCAA metabolism in cancer cell survival remains unclear.
View Article and Find Full Text PDFIntegration of multi-omics layers empowers precision diagnosis through unveiling pathogenic mechanisms on maple syrup urine disease.
J Inherit Metab Dis
January 2025
Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.
Maple syrup urine disease (MSUD) is a rare inherited metabolic disorder characterized by deficient activity of the branched-chain alpha-ketoacid dehydrogenase (BCKDH) complex, required to metabolize the amino acids leucine, isoleucine, and valine. Despite its profound metabolic implications, the molecular alterations underlying this metabolic impairment had not yet been completely elucidated. We performed a comprehensive multi-omics integration analysis, including genomic, epigenomic, and transcriptomic data from fibroblasts derived from a cohort of MSUD patients and unaffected controls to genetically characterize an MSUD case and to unravel the MSUD pathophysiology.
View Article and Find Full Text PDFMaple syrup urine disease diagnosis in Brazilian patients by massive parallel sequencing.
Mol Genet Metab
October 2024
BRAIN Laboratory (Basic Research and Advanced Investigations in Neurosciences), Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Graduate Program in Genetics and Molecular Biology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Graduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Clinical Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Medical Genetics Service, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; Department of Genetics, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; InRaras, National Institute of Rare Diseases, Brazil.
Biallelic pathogenic variants cause maple syrup urine disease (MSUD) in one of the branched-chain α-keto acid dehydrogenase (BCKDH) complex genes (BCKDHA, BCKDHB, DBT, DLD, and PPM1K) leading to the accumulation of leucine, isoleucine, and valine. This study aimed to perform a molecular diagnosis of Brazilian patients with MSUD using gene panels and massive parallel sequencing. Eighteen Brazilian patients with a biochemical diagnosis of MSUD were analyzed by massive parallel sequencing in the Ion PGM Torrent Server using a gene panel with the BCKDHA, BCKDHB, and DBT genes.
View Article and Find Full Text PDFGenotypic and phenotypic spectrum of maple syrup urine disease in Zhejiang of China.
QJM
October 2024
Department of Genetics and Metabolism, Children's Hospital of Zhejiang University, School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China.
Background: Maple syrup urine disease (MSUD) is an autosomal recessive metabolic disorder originating from defects in the branched-chain α-ketoacid dehydrogenase (BCKDH) complex encoded by BCKDHA, BCKDHB and DBT. This condition presents a spectrum of symptoms and potentially fatal outcomes. Although numerous mutations in the BCKDH complex genes associated with MSUD have been identified, the relationship between specific genotypes remains to be fully elucidated.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!