Abstract

SOUTHGATE, Richard; OSORIO, Cristina; BUSTAMANTE, John  and  ALZATE, Óscar. Differential heart protein expression in diabetic type Sprague-Dawley rats. Rev. Col. Cardiol. [online]. 2006, vol.13, n.3, pp.141-148. ISSN 0120-5633.

Cardiac proteins were isolated from diabetic and wild type Sprague-Dawley rats, then fractionated by two dimensional gel electrophoresis (2D-PAGE) using isoelectric focusing and molecular weight. The resulting protein spots were stained to facilitate detection. After being converted into a digital image, the proteins on the diabetic and wild type gels were matched to each other then compared to determine levels of expression. Sixty of the one hundred and eighty proteins on the gel were removed and digested to produce peptide fragments, which were analyzed by mass spectrometry to determine their amino acid sequence. This information was entered into a protein database (http://www.ncbi.nlm.nih.gov/) to determine the identity of the corresponding proteins. The identity of proteins differentially expressed in cardiac tissue of both groups was determined: several proteins were found to be expressed at different levels than normal in the hearts of diabetic rats, including protein tyrosine phosphatase (PTP, Q60998), very low-density lipoprotein receptor (VLDL-R, P98156), glutathione peroxidase (PHGPx, O70325), serine hydroxymethyl transferase (SHMT, P50431), adenylyl cyclase-associated protein 1 (CAP1, P40124), and telethonin (TELT, O70548).

Keywords : cardiac proteins; diabetes mellitus; mouse model; proteomics.

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