The Yersinia enterocolitica Ysa type III secretion system is expressed during infections both in vitro and in vivo
- Univ. of California, Davis, CA (United States). Microbiology Graduate Group; Sandia National Lab. (SNL-CA), Livermore, CA (United States). Systems Biology; DOE/OSTI
- Sandia National Lab. (SNL-CA), Livermore, CA (United States). Biotechnology and Bioengineering
- Univ. of California, Davis, CA (United States). Microbiology Graduate Group; Univ. of California, Davis, CA (United States). Dept. of Food Science and Technology
Yersinia enterocolitica biovar 1B maintains two type III secretion systems (T3SS) that are involved in pathogenesis, the plasmid encoded Ysc T3SS and the chromosomally encoded Ysa T3SS. In vitro, the Ysa T3SS has been shown to be expressed only at 26°C in a high-nutrient medium containing an exceptionally high concentration of salt – an artificial condition that provides no clear insight on the nature of signal that Y. enterocolitica responds to in a host. However, previous research has indicated that the Ysa system plays a role in the colonization of gastrointestinal tissues of mice. In this study, a series of Ysa promoter fusions to green fluorescent protein gene (gƒp) were created to analyze the expression of this T3SS during infection. Using reporter strains, infections were carried out in vitro using HeLa cells and in vivo using the mouse model of yersiniosis. Expression of green fluorescent protein (GFP) was measured from the promoters of yspP (encoding a secreted effector protein) and orƒ6 (encoding a structural component of the T3SS apparatus) in vitro and in vivo. During the infection of HeLa cells GFP intensity was measured by fluorescence microscopy, while during murine infections GFP expression in tissues was measured by flow cytometry. These approaches, combined with quantification of yspP mRNA transcripts by quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR), demonstrate that the Ysa system is expressed in vitro in a contactdependent manner, and is expressed in vivo during infection of mice.
- Research Organization:
- Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- National Institutes of Health (NIH); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- NA0003525
- OSTI ID:
- 1623571
- Journal Information:
- MicrobiologyOpen, Journal Name: MicrobiologyOpen Journal Issue: 6 Vol. 2; ISSN 2045-8827
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Applications of Flow Cytometry to Characterize Bacterial Physiological Responses
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journal | January 2014 |
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