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Mem. Inst. Oswaldo Cruz ; 113(11): e180267, 2018. graf
Article Dans Anglais | LILACS | ID: biblio-1040585

Résumé

The Bacille Calmette-Guérin (BCG) vaccine comprises a family of genetically different strains derived by the loss of genomic regions (RDs) and other mutations. In BCG Moreau, loss of RD16 inactivates rv3405c * , encoding a transcriptional repressor that negatively regulates the expression of Rv3406, an alkyl sulfatase. To evaluate the impact of this loss on the BCG and host cell viability and the cytokine profile, THP-1 cells were infected with BCG Moreau (harbouring the empty vector) and a complemented strain carrying a functional copy of rv3405c. Viability of the host cells and bacteria as well as the pattern of cytokine secretion were evaluated. Our results show that the viability of BCG Moreau is higher than that of the complemented strain in an axenic medium, suggesting a possible functional gain associated with the constitutive expression of Rv3406. Viability of the host cells did not vary significantly between recombinant strains, but differences in the profiles of the cytokine secretion (IL-1β and IL-6) were observed. Our results suggest an example of a functional gain due to gene loss contributing to the elucidation of the impact of RD16 on the physiology of BCG Moreau.


Sujets)
Humains , Transcription génétique/génétique , Vaccin BCG/pharmacologie , Survie cellulaire/génétique , Cytokines/effets des médicaments et des substances chimiques , Mutation gain de fonction/génétique , Macrophages/microbiologie , Mycobacterium bovis/génétique , Facteurs temps , Transcription génétique/effets des médicaments et des substances chimiques , Cellules cancéreuses en culture/effets des médicaments et des substances chimiques , Cellules cancéreuses en culture/microbiologie , Vaccin BCG/génétique , Survie cellulaire/effets des médicaments et des substances chimiques , Cytokines/génétique , Mutation gain de fonction/effets des médicaments et des substances chimiques , Mycobacterium bovis/physiologie
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