Identification of temperature regulated factors of Campylobacter jejuni and their potential roles in virulence.

Autor:	Tang Y; Animal and Plant Health Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK., Cawthraw S; Animal and Plant Health Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK., Bagnall MC; School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK., Gielbert AJ; Animal and Plant Health Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK., Woodward MJ; Food and Nutritional Sciences, University of Reading, Whiteknights, Reading RG6 6AP, UK., Petrovska L; Animal and Plant Health Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK.
Jazyk:	angličtina
Zdroj:	AIMS microbiology [AIMS Microbiol] 2017 Nov 07; Vol. 3 (4), pp. 885-898. Date of Electronic Publication: 2017 Nov 07 (Print Publication: 2017).
DOI:	10.3934/microbiol.2017.4.885
Abstrakt:	Campylobacter jejuni is the major cause of bacterial gastroenteritis in man, while it is generally regarded as a commensal of the avian gut. Consumption and handling of contaminated poultry meat products are major risk factors for human infection. The body temperature in man (37 °C) and chickens (42 °C) differ markedly, and differential gene regulation and protein expression at different temperatures may in part explain the behaviour in the two hosts. We performed proteomics analyses with C. jejuni cells grown at 37 °C and 42 °C. Time-of-flight mass spectrometry (Q-Tof) analysis was carried out after samples were digested with the Filter-Aided Sample Preparation (FASP) method and peptides were fractionated by strong anion exchanges. Differentially regulated proteins were identified by Mascot and Scaffold analyses. Triple quadrupole (QQQ) mass spectrometer analysis confirmed that a total of 33 proteins were differentially regulated between 37 °C and 42 °C. Several upregulated proteins were selected for their corresponding gene knock-out mutants to be tested for their virulence in the Galleria mellonella model. To correlate with other tissue/animal models, the GADH mutant was selected for its reduced ability to colonize chickens. At 37 °C, the mutants of outer membrane protein Omp50 and Chaperone GroEL significantly increased virulence; while at 42 °C, the mutants of YceI, Omp50, and GADH reduced virulence against Galleria mellonella compared with the wild type strains. The results of current and previous studies indicate that GADH is a virulent factor in G. mellonella and a colonization factor in chickens. The workflow of this study may prove a new way to identify stress related virulent factors. The implications of these findings are discussed for pathogenesis in the model and other hosts. Competing Interests: Conflict of Interest: All authors declare no conflicts of interest in this paper.
Databáze:	MEDLINE
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