ABSTRACT
Objective To understand the plasma protein differential expression before and after cardiopulmonary bypass (CPB)through conducting the comparative proteomics study on rats in order to find the plasma markers with potential value in the early diagnosis of CPB resulted complications.Methods 10 adult male SD rats were divided into the experiment group and the con-trol group randomly (n=5),and took food and water freely before operation.The rat models of CPB were constructed in the experi-ment group.But no any CPB operation was administered in the control group in addition to anesthesia induction,arterial and venous puncture procedure.1 mL of blood sample was extracted for separating plasma before CPB and at the end of CPB in the two groups. The total plasma protein was purified.Then the 2-dimensional electrophoresis and the scanning imaging by ImageScanner were per-formed.The protein spots verified to be differential expression were performed the cutting,enzymolysis and peptide fragment ex-traction.Finally the mass spectrometer was adopted to conduct the analysis and identification.Results The number of visualized spots was increased significantly after CPB.17 protein spots with up-regulated expression were identified as differential expression caused by CPB.5 proteins were verified by mass spectrometer analysis and database research.They were gelsolin,haptoglobin,apo-lipoprotein A-1,immunoglobulin gamma-2b and Ba1-647 respectively.Conclusion CPB can cause the differential expression of plas-ma proteins in rat model.According to the function analysis,gelsolin,haptoglobin and apolipoprotein A-1 have the potentiality of be-ing the plasma markers for studying CPB complications.