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Construction and characterization of a Streptococcus suis serotype 2 recombinant expressing enhanced green fluorescent protein.

Chen T, Huang Q, Li Z, Zhang W, Lu C, Yao H - PLoS ONE (2012)

Bottom Line: We did not find significant differences in lethality (50% lethal dose), morbidity and mortality between the two strains.Our results also showed that the Egfp-HA9801 cells grown at 37°C for 36 h displayed greater green fluorescence signals than the cells grown at 28°C for 36 h and 37°C for 24 h.Together, these results indicate that the egfp and spc(r) insertions into the Egfp-HA9801 recombinant did not significantly change the virulence when compared with HA980, and this EGFP labeled strain can be used for future S. suis 2 pathogenesis research.

View Article: PubMed Central - PubMed

Affiliation: Key Lab of Animal Bacteriology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.

ABSTRACT
Streptococcus suis serotype 2 (S. suis 2) is an important pathogen, responsible for diverse diseases in swine and humans. To obtain a S. suis 2 strain that can be tracked in vitro and in vivo, we constructed the Egfp-HA9801 recombinant S. suis 2 strain with egfp and spc(r) genes inserted via homologous recombination. To assess the effects of the egfp and spc(r) genes in HA9801, the biochemical characteristics, growth features and virulence in Balb/C mice were compared between the recombinant and the parent HA9801 strain. We detected the EGFP expression from Egfp-HA9801 by epifluorescence microscopy. The results showed that the biochemical characterization and growth features of the Egfp-HA9801 recombinant were highly similar to that of the parent HA9801. We did not find significant differences in lethality (50% lethal dose), morbidity and mortality between the two strains. Furthermore, the bacterial counts in each various tissues of Egfp-HA9801-infected mice displayed similar dynamic compared with the HA9801-infected mice. Our results also showed that the Egfp-HA9801 cells grown at 37°C for 36 h displayed greater green fluorescence signals than the cells grown at 28°C for 36 h and 37°C for 24 h. The fluorescence in the tissue cryosections of Egfp-HA9801-injected mice was also stronger than that of the HA9801 group. Together, these results indicate that the egfp and spc(r) insertions into the Egfp-HA9801 recombinant did not significantly change the virulence when compared with HA980, and this EGFP labeled strain can be used for future S. suis 2 pathogenesis research.

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Epifluorescence microscopy analysis of the cryosections of the tissues obtained from the mice infected with Egfp-HA9801 or HA9801.The cryosections of liver (A-1), lung (B-1), kidney (C-1), spleen (D-1) and brain (E-1) from the Egfp-HA9801-infected mice were detected under epifluorescent microscope and the FITC images are shown in the left column. The FITC images of the cryosections of liver (A-2), lung (B-2), kidney (C-2), spleen (D-2) and brain (E-2) from the HA9801-infected mice, are showed in the right column.
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pone-0039697-g006: Epifluorescence microscopy analysis of the cryosections of the tissues obtained from the mice infected with Egfp-HA9801 or HA9801.The cryosections of liver (A-1), lung (B-1), kidney (C-1), spleen (D-1) and brain (E-1) from the Egfp-HA9801-infected mice were detected under epifluorescent microscope and the FITC images are shown in the left column. The FITC images of the cryosections of liver (A-2), lung (B-2), kidney (C-2), spleen (D-2) and brain (E-2) from the HA9801-infected mice, are showed in the right column.

Mentions: S. suis recombinant Egfp-HA9801 cells were clearly fluorescent under the epifluorescent microscope, whereas no fluorescent signals from the HA9801 cells were observed (Fig. 5). In particular, the Egfp-HA9801 cells which were grown at 37°C for 36 h showed brighter fluorescent signals than the cells grown at 28°C for 36 h and 37°C for 24 h. Furthermore, the fluorescence of tissue cryosections of the Egfp-HA9801-injected mice was stronger than that of the HA9801 group (Fig. 6).


Construction and characterization of a Streptococcus suis serotype 2 recombinant expressing enhanced green fluorescent protein.

Chen T, Huang Q, Li Z, Zhang W, Lu C, Yao H - PLoS ONE (2012)

Epifluorescence microscopy analysis of the cryosections of the tissues obtained from the mice infected with Egfp-HA9801 or HA9801.The cryosections of liver (A-1), lung (B-1), kidney (C-1), spleen (D-1) and brain (E-1) from the Egfp-HA9801-infected mice were detected under epifluorescent microscope and the FITC images are shown in the left column. The FITC images of the cryosections of liver (A-2), lung (B-2), kidney (C-2), spleen (D-2) and brain (E-2) from the HA9801-infected mice, are showed in the right column.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3401235&req=5

pone-0039697-g006: Epifluorescence microscopy analysis of the cryosections of the tissues obtained from the mice infected with Egfp-HA9801 or HA9801.The cryosections of liver (A-1), lung (B-1), kidney (C-1), spleen (D-1) and brain (E-1) from the Egfp-HA9801-infected mice were detected under epifluorescent microscope and the FITC images are shown in the left column. The FITC images of the cryosections of liver (A-2), lung (B-2), kidney (C-2), spleen (D-2) and brain (E-2) from the HA9801-infected mice, are showed in the right column.
Mentions: S. suis recombinant Egfp-HA9801 cells were clearly fluorescent under the epifluorescent microscope, whereas no fluorescent signals from the HA9801 cells were observed (Fig. 5). In particular, the Egfp-HA9801 cells which were grown at 37°C for 36 h showed brighter fluorescent signals than the cells grown at 28°C for 36 h and 37°C for 24 h. Furthermore, the fluorescence of tissue cryosections of the Egfp-HA9801-injected mice was stronger than that of the HA9801 group (Fig. 6).

Bottom Line: We did not find significant differences in lethality (50% lethal dose), morbidity and mortality between the two strains.Our results also showed that the Egfp-HA9801 cells grown at 37°C for 36 h displayed greater green fluorescence signals than the cells grown at 28°C for 36 h and 37°C for 24 h.Together, these results indicate that the egfp and spc(r) insertions into the Egfp-HA9801 recombinant did not significantly change the virulence when compared with HA980, and this EGFP labeled strain can be used for future S. suis 2 pathogenesis research.

View Article: PubMed Central - PubMed

Affiliation: Key Lab of Animal Bacteriology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China.

ABSTRACT
Streptococcus suis serotype 2 (S. suis 2) is an important pathogen, responsible for diverse diseases in swine and humans. To obtain a S. suis 2 strain that can be tracked in vitro and in vivo, we constructed the Egfp-HA9801 recombinant S. suis 2 strain with egfp and spc(r) genes inserted via homologous recombination. To assess the effects of the egfp and spc(r) genes in HA9801, the biochemical characteristics, growth features and virulence in Balb/C mice were compared between the recombinant and the parent HA9801 strain. We detected the EGFP expression from Egfp-HA9801 by epifluorescence microscopy. The results showed that the biochemical characterization and growth features of the Egfp-HA9801 recombinant were highly similar to that of the parent HA9801. We did not find significant differences in lethality (50% lethal dose), morbidity and mortality between the two strains. Furthermore, the bacterial counts in each various tissues of Egfp-HA9801-infected mice displayed similar dynamic compared with the HA9801-infected mice. Our results also showed that the Egfp-HA9801 cells grown at 37°C for 36 h displayed greater green fluorescence signals than the cells grown at 28°C for 36 h and 37°C for 24 h. The fluorescence in the tissue cryosections of Egfp-HA9801-injected mice was also stronger than that of the HA9801 group. Together, these results indicate that the egfp and spc(r) insertions into the Egfp-HA9801 recombinant did not significantly change the virulence when compared with HA980, and this EGFP labeled strain can be used for future S. suis 2 pathogenesis research.

Show MeSH
Related in: MedlinePlus