Region-specific alterations of global protein expression in the remodelled rat myocardium.
We applied the novel ProteinChip technology (SELDI-MS) to investigate and identify differentially regulated proteins upon myocardial remodelling in different heart regions. Tissue samples were isolated from the atria, the interventricular septum, and the right and left ventricles three months after surgically-induced myocardial infarction (MI) in rats. Corresponding protein extracts from control versus MI hearts were analysed on two different ProteinChip surfaces. In each of the functionally distinct cardiac regions, we obtained specific protein profile alterations upon myocardial remodelling. Most alterations were observed in the non-infarcted right ventricle, where down-regulation occurred more frequently than up-regulation of protein expression. Three of the differentially regulated proteins were identified: the metabolic enzyme triosephosphate isomerase (TIM), the cell signalling protein Raf-1 kinase inhibitory protein (RKIP), also known as phosphatidylethanolamine binding protein (PEBP), and the small heat shock protein alphaB-crystallin. These proteins showed a pronounced tissue-dependent regulation. TIM was down-regulated only in the atrium and in the left ventricle, RKIP/PEBP was down-regulated only in the right ventricle and in the interventricular septum, and alphaB-crystallin was up-regulated only in the right and in the left ventricle. A simple correlation of peak intensity changes using two of the identified peaks demonstrated the diagnostic potential of SELDI-MS. We conclude that this novel proteomic method is a powerful high-throughput tool for the fast detection of region-specific cardiac protein profiles in small biopsy samples, and that SELDI-MS may become a useful complementary technique for the diagnosis and prognosis of cardiac diseases.
Melle
Christian
C
Core Unit Chip Application (CUCA), Institute of Human Genetics and Anthropology, Friedrich Schiller University Jena, 07740 Jena, Germany.
Camacho
Juan A
JA
Surber
Ralf
R
Betge
Stefan
S
Von Eggeling
Ferdinand
F
Zimmer
Thomas
T
D000818:Animals; D003459:Crystallins / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation; D006325:Heart Atria / Q000378:metabolism; D006352:Heart Ventricles / Q000378:metabolism; D006801:Humans; D013058:Mass Spectrometry; D009203:Myocardial Infarction / Q000209:etiology; D009206:Myocardium / Q000378:metabolism*; D049488:Phosphatidylethanolamine Binding Protein / Q000378:metabolism; D040081:Protein Array Analysis; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D011917:Rats, Inbred Lew; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013997:Time Factors; D014305:Triose-Phosphate Isomerase / Q000378:metabolism; D020257:Ventricular Remodeling / Q000502:physiology
D003459:Crystallins; D049488:Phosphatidylethanolamine Binding Protein; D011506:Proteins; D014305:Triose-Phosphate Isomerase