作者:
YIN JingFengTANG QingWANG FengLongWANG JinLingDING YuLinTAO XiaoYanLI HaoSONG MiaoGUO ZhenYangSHEN XinXinLIANG GuoDongCollege of Veterinary Medicine
Inner Mongolia Agricultural UniversityHuhhot010018Inner MongoliaChina Key Laboratory for Medical VirologyMinistry of HealthInstitute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention(IVDCChina CDC)Beijing 102206China State Key Laboratory for Infectious Disease Prevention and ControlInstitute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention(IVDCChina CDC)Beijing102206China
Objective We performed pathological observation and etiological identification on specimens collected from cow, cattle and dog which were suspected of rabies in Inner Mongolia, in 2011, and analyzed their etiology and...
Objective We performed pathological observation and etiological identification on specimens collected from cow, cattle and dog which were suspected of rabies in Inner Mongolia, in 2011, and analyzed their etiology and characteristics. Methods Pathological observation was conducted on the brain specimens of three infected animals with Hematoxylin-Eosin staining, followed by confirmation using immunofluorescence and nested RT-PCR methods. Finally, phylogenetic analysis was conducted using the virus N gene sequence amplified from three specimens. Results Eosinophilic and cytoplasmic inclusion bodies were seen in neuronai cells of the CNS; and rabies non-characteristic histopathological changes were also detected in the CNS. The three brain specimens were detected positive. N gene nucleotide sequence of these three isolates showed distinct sequence identity, therefore they fell into different groups in the phylogenetic analysis. N gene in the cow and dog had higher homology with that in Hebei isolate, but that in the beef cattle had higher homology with that in Mongolian lupine isolate and Russian red fox isolate. Conclusion Rabies were observed in the dairy cow, beef cattle and canine in the farm in Inner Mongolia, in 2011, which lead to a different etiology characteristics of the epidemic situation.
Neonatal rat primary myocardial cells were subjected to heat stressin vitro,as a model for investigating the distribution and expression of Hsp27 and αB-crystallin. After exposure to heat stress at 42 ℃ for differen...
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Neonatal rat primary myocardial cells were subjected to heat stressin vitro,as a model for investigating the distribution and expression of Hsp27 and αB-crystallin. After exposure to heat stress at 42 ℃ for different durations,the activities of enzymes expressed during cell damage increased in the supernatant of the heat-stressed myocardial cells from 10 min,and the pathological lsions were characterized by karyopyknosis and acute degeneration. Thus,cell damage was induced at the onset of heat stress. Immunofluorescence analysis showed stronger positive signals for both Hsp27 and αB-crystallin from 10 min to 240 min of exposure compared to the control cells. According to the Western blotting results,during the 480 min of heat stress,no significant variation was found in Hsp27 and αB-crystallin expression;however,significant differences were found in the induction of their corresponding mRNAs. The expression of these small heat shock proteins (sHsps) was probably delayed or overtaxed due to the rapid consumption of sHsps in myocardial cells at the onset of heat stress. Our findings indicate that Hsp27 and αB-crystallin do play a role in the response of cardiac cells to heat stress,but the details of their function remain to be investigated.
The 37/67-kDa laminin receptor precursor (LRP)/laminin receptor (LR) is a cell surface receptor for cellular prion proteins and misfolded pathological prions. Previous research has shown that blocking or decreasing LR...
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The 37/67-kDa laminin receptor precursor (LRP)/laminin receptor (LR) is a cell surface receptor for cellular prion proteins and misfolded pathological prions. Previous research has shown that blocking or decreasing LRP/LP levels by anti-LRP/LR antibodies or small interfering RNAs (siRNAs) can prolong the incubation phase of experimental prion infection. This study aimed to investigate potential mechanisms contributing to prion resistance/susceptibility by using the rabbit,a species unsusceptible to prion infection,as a model. We investigated the expression level and distribution of LRP/LR in rabbit tissues by real-time polymerase chain reaction and by immunochemical analysis with a monoclonal anti-67 kDa LR antibody. Our results showed LRP/LR mRNA expression in all the tissues examined. Very low LRP/LR expression levels were observed in central nervous system (CNS) tissues, whereas high expression levels were observed in reproductive and digestive tissues,which differed from the expression patterns that have been reported for prionsusceptible animals. The immunochemical staining results were generally consistent with the mRNA findings,although no LR protein was detected in CNS tissues. Our findings provide a basis for further studies on prion resistance in rabbits and other animal species.
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