Résumé
Objective To study the protective effect and mechanism of SD rats′liver transplantation reperfusion ischemia‐reper‐fusion injury(IRI) after GW3965 activation of liver X receptor preprocessing .Methods Separated Male SD(Sprague‐Dawley) 70 rats into 3 groups which were sham operation group (SO group ,14 rats) ,orthotopic liver transplantation group (OLT group ,28 rats) ,and GW 3965 preprocessing group(GW 3965 group 28rats) .The levels of serum transaminase ,plasma inflammatory factors (TNF‐α、IL‐1) ,the changes of hepatic pathology and inflammatory factor mRNA ,and the activities as well as its expressions of NF‐κB in hepatic tissue were observed ,after the operation .Results After 6 and 24 hours perfusion ,the levels of plasma inflammatory factors was expression ,serum transaminase ,the liver pathological injury degree and the activities as well as its expressions of NF‐κB in OLT group and GW3965 group were higher than those in SO group .While after reperfusion for 6 and 24 hours ,the levels of ser‐um transaminase ,plasma inflammatory factors expression ,the liver pathological injury degree ,inflammatory factor and the activities as well as its expressions of NF‐κB in GW3965 group were much lower than those in OLT group ,there were obvious differences (P<0 .05) .Conclusion After GW3965 activation of liver X receptor preprocessing ,the activities of NF‐κB and the emerging of downstream inflammatory mediator factors are reduced effectively and protect the liver after the ischemia reperfusion .
Résumé
Objective To investigate p75 NTR expressing neurons and hyperphosphorylated tau protein containing neurons in the hippocampal CA1 subfield of Alzheimer's disease. Methods Samples of hippocampus of 10 female AD patients and 10 non-demented female controls matched with age and postmortem delay were obtained from the Netherlands Brain Bank. The main body of hippocampus was dissected, dehydrated and embedded in paraffin. Serial 6-?m coronal sections were cut, and 3 successive sections were selected. The first section was stained with 0.5% thionin, the second was processed for p75 NTR immunocytochemistry and the third was processed for p75 NTR double-labeling immunocytochemistry with Alz-50. For quantitative analysis of the total number of neurons, p75 NTR expressing neurons and neurons colocalizing p75 NTR and Alz-50 in the CA1 subfields, a MetaMorph image acquisition and processing software (Universal Imaging Corp, USA) was used.Results The total number of neurons, p75 NTR immunoreactive neurons and ratio of the latter to the former in 1 mm2 of the CA1 subfield of AD patients were 293.2?37.0, 116.0?20.4 and 39.7%?5.3%, respectively, of controls were 473.6?63.1, 136.7?24.4 and 28.9%?3.7%, respectively. There was significant decrease in the total number of neurons of the AD patients in comparison with controls (P=0.000 2). However, the ratio of p75 NTR neurons to total number of neurons was significant increase in AD patients compared with controls (P=0.001). The number of Alz-50 neurons, Alz-50 and p75 NTR double-labeling neurons and ratio of the latter to the former in 1 mm2 of the CA1 subfield of AD patients were 87.5?29.2, 76.4?26.6 and 86.6%?5.0%, respectively. Furthermore, the number of p75 NTR containing neurons was significantly correlated to the number of Alz-50 expressing neurons (r=0.79, P=0.006). Conclusion The p75 NTR may interact with hyperphosphorylated tau protein and involve in the pathogenesis of Alzheimer′s disease.