Key result
Proteomic analysis of rat MI border zones identifies 69 differential proteins during early remodeling.
Why the study?
Long-term outcome after myocardial infarction depends on the extent of post-infarct remodelling, but molecular mechanisms in the border zone remain unclear.
Proteomic analysis of the border zone in a rat MI model identified 69 differentially expressed proteins involved in early-stage remodeling, offering potential therapeutic targets.
Reveals 69 proteins with temporal patterns in post-MI border zone; leaves open therapeutic targets pending functional validation.
AIMS: Long-term outcome of patients after myocardial infarction (MI) largely depends on the extent of post-infarct remodelling. To explore the molecular mechanism of remodelling, comparative proteomic analysis was undertaken to identify differential myocardial proteome profiles expressed in the border zone of the post-MI heart. METHODS AND RESULTS: Two-dimensional gel electrophoresis and matrix-assisted laser desorption/ionization tandem time-of-flight mass spectrometry were used to identify the differential protein profiles expressed in the border zone at specific time points (Days 0, 1, 4, and 10 post-infarction) in a permanent rat MI model. We identified 96 differential protein spots, corresponding to 69 proteins. Cluster analysis exhibited five main temporal expression patterns corresponding to the three phases of early stage remodelling. The alteration in expression was supported by reverse transcription-polymerase chain reaction, western blotting, and immunohistochemical analysis of three selected proteins. Bioinformatics analysis revealed that the proteins in each pattern were functionally related to specific cell processes in remodelling, such as ischaemia, inflammation, and proliferation. CONCLUSION: A differential myocardial proteome profile was identified in the border zone during early stage post-infarct remodelling. Bioinformatics analysis indicated a possible role of these proteins in remodelling. Proteomics data provided the basis for further functional study of these proteins and for identifying potential molecular targets with therapeutic anti-remodelling effects.
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Xiang et al. (2010) studied Myocardial infarction (post-infarct remodelling). Myocardial infarction (permanent rat MI model) vs. Baseline (Day 0) or different time points was evaluated on Differential protein profiles expressed in the border zone. Proteomic analysis of the border zone in a rat myocardial infarction model identified 96 differential protein spots corresponding to 69 proteins across three phases of early stage remodelling.
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