RGD Reference Report - Multiphasic triacylglycerol dynamics in the intact heart during acute in vivo overexpression of CD36. - Rat Genome Database

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Multiphasic triacylglycerol dynamics in the intact heart during acute in vivo overexpression of CD36.

Authors: Carley, AN  Bi, J  Wang, X  Banke, NH  Dyck, JR  O'Donnell, JM  Lewandowski, ED 
Citation: Carley AN, etal., J Lipid Res. 2013 Jan;54(1):97-106. doi: 10.1194/jlr.M029991. Epub 2012 Oct 25.
RGD ID: 11041154
Pubmed: PMID:23099442   (View Abstract at PubMed)
PMCID: PMC3520544   (View Article at PubMed Central)
DOI: DOI:10.1194/jlr.M029991   (Journal Full-text)

Cardiac triacylglycerol (TAG) stores buffer the intracellular availability of long chain fatty acid (LCFA) that act as nuclear receptor ligands, substrate for lipotoxic derivatives, and high energy-yield fuel. The kinetic characteristics of TAG turnover and homeostatic mechanisms linking uptake and storage dynamics in hearts have until now remained elusive. This work examines TAG pool dynamics in the intact beating heart, under normal conditions and in response to acute gene expression-induced changes in CD36. Dynamic mode (13)C NMR elucidated multiple kinetic processes in (13)C-palmitate incorporation into TAG: an initial, saturable exponential component and a slower linear rate. Although previous work indicates the linear component to reflect TAG turnover, we hypothesized the saturable exponential to reflect transport of LCFA across the sarcolemma. Thus, we overexpressed the LCFA transporter CD36 through cardiac-specific adenoviral infection in vivo. Within 72 h, CD36 expression was increased 40% in intact hearts, accelerating the exponential phase relative to PBS-infused hearts. TAG turnover also increased with elevations in adipose triglyceride lipase (ATGL) and a modest increase in diacylglycerol acyltransferase 1 (DGAT1), without a significant expansion of the intracellular lipid pools. The results demonstrate a dynamic system of reciprocal gene regulation that couples saturable LCFA uptake across the sarcolemma to TAG synthesis/lipolysis rates.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
positive regulation of triglyceride metabolic process  IDA 11041154 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Cd36  (CD36 molecule)


Additional Information