Linked Life Data

21151927

Source:http://linkedlifedata.com/resource/pubmed/id/21151927

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2010-12-14
pubmed:abstractText
Disorders of mitochondrial fat metabolism lead to sudden death in infants and children. Although survival is possible, the underlying molecular mechanisms which enable this outcome have not yet been clearly identified. Here we describe a conserved genetic network linking disorders of mitochondrial fat metabolism in mice to mechanisms of fat storage and survival in Caenorhabditis elegans (C. elegans). We have previously documented a mouse model of mitochondrial very-long chain acyl-CoA dehydrogenase (VLCAD) deficiency. We originally reported that the mice survived birth, but, upon exposure to cold and fasting stresses, these mice developed cardiac dysfunction, which greatly reduced survival. We used cDNA microarrays to outline the induction of several markers of lipid metabolism in the heart at birth in surviving mice. We hypothesized that the induction of fat metabolism genes in the heart at birth is part of a regulatory feedback circuit that plays a critical role in survival. The present study uses a dual approach employing both C57BL/6 mice and the nematode, C. elegans, to focus on TMEM135, a conserved protein which we have found to be upregulated 4.3 (±0.14)-fold in VLCAD-deficient mice at birth. Our studies have demonstrated that TMEM135 is highly expressed in mitochondria and in fat-loaded tissues in the mouse. Further, when fasting and cold stresses were introduced to mice, we observed 3.25 (±0.03)- and 8.2 (±0.31)-fold increases in TMEM135 expression in the heart, respectively. Additionally, we found that deletion of the tmem135 orthologue in C. elegans caused a 41.8% (±2.8%) reduction in fat stores, a reduction in mitochondrial action potential and decreased longevity of the worm. In stark contrast, C. elegans transgenic animals overexpressing TMEM-135 exhibited increased longevity upon exposure to cold stress. Based on these results, we propose that TMEM135 integrates biological processes involving fat metabolism and energy expenditure in both the worm (invertebrates) and in mammalian organisms. The data obtained from our experiments suggest that TMEM135 is part of a regulatory circuit that plays a critical role in the survival of VLCAD-deficient mice and perhaps in other mitochondrial genetic defects of fat metabolism as well.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1932-6203
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
e14228
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:21151927-Acyl-CoA Dehydrogenase, Long-Chain, pubmed-meshheading:21151927-Adipose Tissue, pubmed-meshheading:21151927-Animals, pubmed-meshheading:21151927-Antioxidants, pubmed-meshheading:21151927-Caenorhabditis elegans, pubmed-meshheading:21151927-Caenorhabditis elegans Proteins, pubmed-meshheading:21151927-Fatty Acids, pubmed-meshheading:21151927-Gene Deletion, pubmed-meshheading:21151927-Gene Expression Regulation, pubmed-meshheading:21151927-Gene Regulatory Networks, pubmed-meshheading:21151927-Lipid Metabolism, Inborn Errors, pubmed-meshheading:21151927-Longevity, pubmed-meshheading:21151927-Membrane Proteins, pubmed-meshheading:21151927-Metabolism, Inborn Errors, pubmed-meshheading:21151927-Mice, pubmed-meshheading:21151927-Mice, Knockout, pubmed-meshheading:21151927-Mitochondrial Diseases, pubmed-meshheading:21151927-Muscular Diseases, pubmed-meshheading:21151927-Subcellular Fractions, pubmed-meshheading:21151927-Tissue Distribution
pubmed:year
2010
pubmed:articleTitle
Stressed-induced TMEM135 protein is part of a conserved genetic network involved in fat storage and longevity regulation in Caenorhabditis elegans.
pubmed:affiliation
Thomas P. Graham Division of Pediatric Cardiology, Department of Pediatrics, Monroe Carell Jr. Children's Hospital at Vanderbilt University, Nashville, Tennessee, United States of America. Vernat.exil@vanderbilt.edu
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural