Abilities Training in PBL / 中华医学教育探索杂志

The abilities of self-study,thinking and communication are much more emphasized in the problem based learning(PBL)than in the conventional curriculum.From the view of the inherent relationship between the ability training and PBL,this paper probes into the characteristics of PBL to find the way of fitting the situation of our country.It is essential to the successful teaching and training more high quality students.

Expression of the extracellular domain of human CD7 in Escherichia coli / 免疫学杂志

Objective　To get the antigen of CD7.Methods　 The extracellular domain of human CD7 was cloned from a plasmid containing the full length of human CD7 cDNA and expressed in pinpoint-xa3 prokaryotic system. Results　 Analysis with SDS-PAGE and Western-blotting showed that the expressed protein could bind to the anti-CD7 mAb specifically and is about 30 000 u in molecular weight. Conclusion　 These results paved the way for preparing anti-CD7 engineering antibody.

Effects of lipopolysaccharide binding protein on activation of p38 signaling pathway induced by LPS in macrophages / 中国病理生理杂志

AIM: To investigate the regulatory effects of lipopolysaccharide binding protein(LBP)on activation of p38 signaling pathway induced by lipopolysaccharide(LPS)in alveolar macrophages. METHODS: The LBP from actue phase rat serum was purified by ammonium sulphate precipitation, Bio-Rex70 resin and the MonoQ column. Rat alveolar macrophages were exposed to LPS (0 01 mg/L or 1 mg/L) the various concentrations of LBP(0 mg/L, 0 01 mg/L, 0 1 mg/L,1 mg/L and 10 mg/L) Western blotting were used to detect phospho-p38 in alveolar macrophages RESULTS: SDS-PAGE analysis indicated that the purified preparation of rat LBP showed homogeneity and the molecular weight was 60 kD.The binding of lipopolysaccharide to mononuclear cells were enhanced by purified rat LBP. Stimulation of rat alveolar macrophages with LPS at concentration of 0.01 mg/L was LBP dependent. LBP at concentrations up to 1 mg/L was able to increase the activation of p38. However , when LBP concentrations were further increased to 10 mg/L, the phosphorylation levers of p38 were lower as compared with that in the presence of 1 mg/L. Stimulation of rat alveolar macrophages with LPS at concentrations of 1 mg/L was LBP-independent. CONCLUSION: The activation of p38 induced by LPS at lower concentration(0.01 mg/L ) was LBP-dependent, meanwhile, LPS at higher concentration (1 mg/L ) was LBP-independent.

The role of mast cells in responses to bacterial and viral infection / 中国病理生理杂志

Since the discovery of mast cells (MCs) in 1878, MCs have long been recognised to be the key effector cells in allergic reactions. However, little is known about their roles in defending microorganisms. In this review, the recent research progress in the roles of MCs, in the body defence against bacterial and viral infection, in pathogen recognition mechanisms and in inflammatory mediator release are discussed.