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Objective To identify a myeloid differentiation factor 88(MyD88)in Oncomelania hupensis,and characterize the role of MyD88 against Schistosoma japonicum infection. Methods The complete cDNA of MyD88 in O. hupensis was ob-tained by using rapid amplification of cDNA ends(RACE),and homologues sequences and conserved domains were aligned and the structure of MyD88 was predicted either. A phylogenetic tree of MyD88 was further constructed with other species. In ad-dition,the mRNA expression level of O. hupensis MyD88 before and after S. japonicum infection was investigated by real-time quantitative PCR(RT-qPCR). Results The cDNA of O. hupensis MyD88 consisted of 1406 bp open reading frame(ORF),en-coding 468 amino acid residues,which contained death domain and Toll/interlrukin-1 receptor(TIR)domain,the typical fea-tures of MyD88 family proteins. The predicted amino acid sequence of O. hupensis MyD88 shared 38%-52%identity with other mollusc. O. hupensis MyD88 was phylogenetically closeted to Biomphalaria glabrata MyD88. The O. hupensis MyD88 existed in all selected tissues and expressed highly in hemocyte,up-regulated after S. japonicum infection in all selected tissues except cephalopodium,especially higher in whole snail and hemocyte. Conclusion MyD88-dependent signaling pathway is present in O. hupensis and plays an important role in innate immune response against S. japonicum infection.
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Objective To investigate the expression of miRNA associated with hepatic fibrosis induced by Schistosoma ja-ponicum soluble egg antigen stimulation in mouse hepatocytes(AML12),so as to lay the foundation for clarifying the mecha-nism of schistosome infection leading to hepatic fibrosis. Methods The expressions of miR-122,miR-182,miR-23b,miR-27b and KSRP in AML12 cells treated with SEA were measured by q-PCR. KSRP protein in cell lyses was measured by Western blotting. AML12 cells were transfected with miR-27b precursor or anti-miR-27b for 24 h,then q-PCR was adopted to determine KSRP mRNA,and KSRP protein was detected by Western blotting. Results The expressions of miR-182,miR-23b and miR-27b were decreased and miR-122 was increased in AML12 cells following SEA treatment(all P<0.05). An increase of mRNA and protein of KSRP expression was also observed in AML12 cells after SEA stimulation(both P<0.05). In addition,KSRP mRNA expression was not changed significantly in AML12 cells transfected with anti-miR-27b or miR-27b precursor,and miR-27b precursor reduced KSRP protein expression as compared with the control. In contrast,the expression of KSRP protein was increased in the anti-miR-27b group and decreased in the miR-27b precursor group. Conclusions After the stimulation of SEA,the expressions of a variety of liver fibrosis-related miRNAs and KSRP change in murine hepatocytes,including miR-27b. And miR-27b can regulate the expression of KSRP. These findings might lay a foundation for further study on the molecular mechanism of fibrosis induced by schistosome infection.
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Recent studies found that B cell subsets and their factors have double effects on anti-and aiding schistosome infec-tion. This article summarizes the research progress of positive and negative immunoregulation of schistosome infection involving B lymphocytes antibody and regulatory B cells Bregs relating cytokines IL-10 IL-7 and TGF-β .
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Objective To explore the effect of ca se-teaching applied to the classes of practical training of parasitology. Methods The case-teaching was tentatively performed in a part of the undergraduates in our school during their parasitology practical training classe s.Results The effect of case-teaching was obviously superior t o the traditional one. The total scores,the theory examination and the specimen recognition scores were all higher in the class which employed the case-teachin g than in the control ones (P
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Objective To investigate the effect of chronic infection of Toxoplasma gondii on the spatial learning and memory capability in mice.Methods Toxoplasma tachyzoites(RH strain)were reanimated at 37 ℃ after 15 days' storage at-20 ℃,and injected intraperitoneally to mice of the experimental group each with 7.7?105.Normal saline was given to the control group,0.5 ml per mouse.Two months later,all mice were tested in the Morris Water Maze.Smears of the mice brain homogenate and pathological sections were examined.Results ① The density of cysts in the brain homogenate was 15/HP,and there was no evident pathological change in the hippocampus and adjacent areas of mice in the brain in the experimental mice.② Latency to platform,cumulative distance to the platform,total distance traveled in both experimental and control groups decreased significantly with the increase of training days(P