Trichinella spiralis infection in rodents is a well-known model of intestinal inflammation associated with hypermotility. The aim of the study was to use this experimental model to elucidate if Thl 7 cells are involve...Trichinella spiralis infection in rodents is a well-known model of intestinal inflammation associated with hypermotility. The aim of the study was to use this experimental model to elucidate if Thl 7 cells are involved in the development of gastrointestinal hypermotility. Colonic smooth muscle contractility was investigated in response to acetylcholine. The levels of IL-17, IL-23 and TGF-β1 in colon were measured by Western blotting. Flow cytometric detection of intracellular IFN-7/IL-4/ IL- 17 cytokine production was used to analyze the proportions of CD4＋ T cells subsets in colon. Our results showed that colonic muscle contractility was increased 2 weeks post infection （PI） and stayed high 12 weeks PI when no discernible inflammation was present in the gut. The proportion of Th17 cells and the expression of IL-17 were up-regulated in colon 2 weeks PI and returned to normal 8 weeks PI. The content of IL-17 was correlated with the colonic smooth muscle hypercontracility 2 weeks PI. Meanwhile, TGF-β1 was increased 2 weeks PI, while IL-23 was normal. Our results suggest that Th17 cells affect the colonic muscle contractility in mice infected with Trichinella spiralis at intestine stage but not at muscle stage and the effect of Th17 cells on muscle contractility might be induced by TGF-β1. Other cytokines might be involved in the hypercontracility of colonic smooth muscle at muscle stage.展开更多
Urea-soluble antigens of Trichinella spiralis infected larva were preparedand the efficiency of the antigens in diagnosis of trichinosis by ELISA wasstudied.Specific IgG antibodies were detected by ELISA using urea-so...Urea-soluble antigens of Trichinella spiralis infected larva were preparedand the efficiency of the antigens in diagnosis of trichinosis by ELISA wasstudied.Specific IgG antibodies were detected by ELISA using urea-solubleantigens in 91.67% (22/24) of 24 serum samples taken from patients withtrichinosis and 91.67% (11/12) of 12 blood spots on filter paper.Specific IgMantibodies were seen in 95.24% (20/21) of 21 serum samples from patients withtrichinosis using the antigens.Sera of patients infected with Schistosoma japonicumhad some cross teactions to the antigens,but the sera of mice infected withSchistosoma japoni(?) Ancylostoma caninum larva and Plasmodium yoelti were allnegative in the test.展开更多
Five restriction endonucleases were used to digest genomic DNA from 5 isolates of Trichinella spiralis obtained from Changchun, Tianjin, Xian, Henan and Yunnan. All the isolates were secured from pigs except the Chang...Five restriction endonucleases were used to digest genomic DNA from 5 isolates of Trichinella spiralis obtained from Changchun, Tianjin, Xian, Henan and Yunnan. All the isolates were secured from pigs except the Changchun strain which came from dog. The DNA fragments digested by endonuclease were separated by agarose gel electrophoresis. The Changchun isolate had a EcoRI band at 1. 12kb and a DraI band at 1. 97kb which were unique to this isolate. A cloned specific repetitive DNA sequence (1. 12kb) from the Changchun strain was selected to prepare a probe for the Southern blotting of EcoRI restriction DNA fragments for the 5 isolates. The 1.12kb hybridizing band did not appear except in the Changchun isolate.These results seem to indicate that there are differences between the isolates obtained from hosts in different geographical regions.展开更多
Trichinella spiralis (T. spiralis), which is a cosmopolitan nematode that infects humans among other species, presents a complex host-parasite relationship that hinders the development of tools to eradicate the parasi...Trichinella spiralis (T. spiralis), which is a cosmopolitan nematode that infects humans among other species, presents a complex host-parasite relationship that hinders the development of tools to eradicate the parasitosis. The aim of this research was to analyze the host response during a primary infection with T. spiralis in five genetically different mouse lines of the CBi-IGE stock. Adult males from the CBi+, CBi−, CBi, CBi/L and CBi/C lines were infected with 1, 2 or 4 L1 larvae per g of body weight. In the chronic stage, the number of parasites per g of tissue (relative larval load, rLL) showed a significant host genotype-dose interaction, since it did not increase in the same way in the five genotypes. At the lowest dose, both CBii−and CBi/L mice were resistant while CBi+, CBi/C, and CBi were susceptible. At the highest dose, only CBi/L remained resistant, and CBi+ was the most susceptible. The reproductive capacity index of adult worms (RCI = rLL/infective dose) evinced only a genotype effect, allowing rating each line as resistant or susceptible regardless of dose. Animals receiving 2 L1 larvae were also sacrificed in the intestinal phase (6 and 13 days p-i) to determine the number of adult parasites (nAP) recovered in a small intestine segment, and female fecundity (Ff). No differences in nAP were observed among genotypes on day 6 p-i. nAP decreased between days 6 and 13 p-i, this reduction being different among genotypes and significant only in CBi/L and CBi/C. Ff decreased in CBi/L and CBi/C on day 13 p-i. At the time of infection, serum cytokine baseline values showed a Th1 orientation for genotype CBi/L (high IFN-γ and IL-2) and a Th2 for CBi+ (high IL-4 and IL-10).The variability in the response observed in this murine model suggests its potential usefulness to gain insight into the mechanisms that regulate host-parasite relationship.展开更多
The comparative studies of diagnostic efficiency of excretory-secretory antigens of Trichinella spiralis and Trichinella nativa were performed using blood sera of rats from Wistar line experimentally infected with Arc...The comparative studies of diagnostic efficiency of excretory-secretory antigens of Trichinella spiralis and Trichinella nativa were performed using blood sera of rats from Wistar line experimentally infected with Arctic trichinellae. For animal infection and antigen preparation Trichinella from muscles of wild carnivorous mammals from Arctic regions of Russia were used. When antigen from T. nativa larvae was used to analyze titers of sera of rats experimentally infected with Arctic Trichinella, a significant increase in efficacy ofELISAwas detected. E.g., sera of rats infected with trichinellae from ringed seals retained in ELISA with T. nativa antigen values higher than diagnostic level at titers of 1:6400 - 1:12800, while titer of those same sera when using T. spiralis antigen was no higher than 1:200 - 1:400.展开更多
基金supported by a grant from the National Natural Sciences Foundation of China(No.30770986)
文摘Trichinella spiralis infection in rodents is a well-known model of intestinal inflammation associated with hypermotility. The aim of the study was to use this experimental model to elucidate if Thl 7 cells are involved in the development of gastrointestinal hypermotility. Colonic smooth muscle contractility was investigated in response to acetylcholine. The levels of IL-17, IL-23 and TGF-β1 in colon were measured by Western blotting. Flow cytometric detection of intracellular IFN-7/IL-4/ IL- 17 cytokine production was used to analyze the proportions of CD4＋ T cells subsets in colon. Our results showed that colonic muscle contractility was increased 2 weeks post infection （PI） and stayed high 12 weeks PI when no discernible inflammation was present in the gut. The proportion of Th17 cells and the expression of IL-17 were up-regulated in colon 2 weeks PI and returned to normal 8 weeks PI. The content of IL-17 was correlated with the colonic smooth muscle hypercontracility 2 weeks PI. Meanwhile, TGF-β1 was increased 2 weeks PI, while IL-23 was normal. Our results suggest that Th17 cells affect the colonic muscle contractility in mice infected with Trichinella spiralis at intestine stage but not at muscle stage and the effect of Th17 cells on muscle contractility might be induced by TGF-β1. Other cytokines might be involved in the hypercontracility of colonic smooth muscle at muscle stage.
文摘Urea-soluble antigens of Trichinella spiralis infected larva were preparedand the efficiency of the antigens in diagnosis of trichinosis by ELISA wasstudied.Specific IgG antibodies were detected by ELISA using urea-solubleantigens in 91.67% (22/24) of 24 serum samples taken from patients withtrichinosis and 91.67% (11/12) of 12 blood spots on filter paper.Specific IgMantibodies were seen in 95.24% (20/21) of 21 serum samples from patients withtrichinosis using the antigens.Sera of patients infected with Schistosoma japonicumhad some cross teactions to the antigens,but the sera of mice infected withSchistosoma japoni(?) Ancylostoma caninum larva and Plasmodium yoelti were allnegative in the test.
文摘Five restriction endonucleases were used to digest genomic DNA from 5 isolates of Trichinella spiralis obtained from Changchun, Tianjin, Xian, Henan and Yunnan. All the isolates were secured from pigs except the Changchun strain which came from dog. The DNA fragments digested by endonuclease were separated by agarose gel electrophoresis. The Changchun isolate had a EcoRI band at 1. 12kb and a DraI band at 1. 97kb which were unique to this isolate. A cloned specific repetitive DNA sequence (1. 12kb) from the Changchun strain was selected to prepare a probe for the Southern blotting of EcoRI restriction DNA fragments for the 5 isolates. The 1.12kb hybridizing band did not appear except in the Changchun isolate.These results seem to indicate that there are differences between the isolates obtained from hosts in different geographical regions.
文摘Trichinella spiralis (T. spiralis), which is a cosmopolitan nematode that infects humans among other species, presents a complex host-parasite relationship that hinders the development of tools to eradicate the parasitosis. The aim of this research was to analyze the host response during a primary infection with T. spiralis in five genetically different mouse lines of the CBi-IGE stock. Adult males from the CBi+, CBi−, CBi, CBi/L and CBi/C lines were infected with 1, 2 or 4 L1 larvae per g of body weight. In the chronic stage, the number of parasites per g of tissue (relative larval load, rLL) showed a significant host genotype-dose interaction, since it did not increase in the same way in the five genotypes. At the lowest dose, both CBii−and CBi/L mice were resistant while CBi+, CBi/C, and CBi were susceptible. At the highest dose, only CBi/L remained resistant, and CBi+ was the most susceptible. The reproductive capacity index of adult worms (RCI = rLL/infective dose) evinced only a genotype effect, allowing rating each line as resistant or susceptible regardless of dose. Animals receiving 2 L1 larvae were also sacrificed in the intestinal phase (6 and 13 days p-i) to determine the number of adult parasites (nAP) recovered in a small intestine segment, and female fecundity (Ff). No differences in nAP were observed among genotypes on day 6 p-i. nAP decreased between days 6 and 13 p-i, this reduction being different among genotypes and significant only in CBi/L and CBi/C. Ff decreased in CBi/L and CBi/C on day 13 p-i. At the time of infection, serum cytokine baseline values showed a Th1 orientation for genotype CBi/L (high IFN-γ and IL-2) and a Th2 for CBi+ (high IL-4 and IL-10).The variability in the response observed in this murine model suggests its potential usefulness to gain insight into the mechanisms that regulate host-parasite relationship.
文摘The comparative studies of diagnostic efficiency of excretory-secretory antigens of Trichinella spiralis and Trichinella nativa were performed using blood sera of rats from Wistar line experimentally infected with Arctic trichinellae. For animal infection and antigen preparation Trichinella from muscles of wild carnivorous mammals from Arctic regions of Russia were used. When antigen from T. nativa larvae was used to analyze titers of sera of rats experimentally infected with Arctic Trichinella, a significant increase in efficacy ofELISAwas detected. E.g., sera of rats infected with trichinellae from ringed seals retained in ELISA with T. nativa antigen values higher than diagnostic level at titers of 1:6400 - 1:12800, while titer of those same sera when using T. spiralis antigen was no higher than 1:200 - 1:400.
