ABSTRACT
Objective To investigate the expression and significance of major histocompatibility complex classⅡgene in multiple organ dysfunction syndrome.Methods Two-hit porcine model of MODS was duplicated in 18 swine that were randomly assigned into experimental group(Group M,n=9) and control group(Group C,n=9).The Group M was given compound factors including hemorrhagic shock,reperfusion injury and endotoxemia,and the Group C only underwent anesthesia and arterious/ve- nous eannula.After seven days,the animals were killed to remove splenic tissues fro extracting total RNA by Trizol method.The primer of SLA-DQA(MHC classⅡgene of swine)was designed to construct cD- NA by reverse transcription and the quantity of SLA-DQA mRNA detected with real time fluorescent quan- titative polymerase chain reaction(real time FQ-PCR).The standard curve was described by UVP com- puter image analysis system.Results The mortality of Group M was 78%(7/9),and the incidence rate of MODS was 89%(8/9).The expressing quantity of Group M was(1.376?1.006)?10~3,signifi- cantly lower than(5.330?3.053)?10~3 of Group C(P＜0.01).Conclusion Duplication of por- cine MODS model is satisfactory.Down-regulation of MHC classⅡgene may be due to control of classⅡtransactivator(CⅡTA)and release of multiple eytokine,such as TNF-?and IL-10.