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Pérez Jorge G, Módolo DG, Jaimes-Florez YP, Fávaro WJ, Bispo de Jesus M, Brocchi M. p53 gene delivery via a recombinant Salmonella enterica Typhimurium leads to human bladder carcinoma cell death in vitro. Lett Appl Microbiol 2022; 75:1010-1020. [PMID: 35737820 DOI: 10.1111/lam.13777] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 06/13/2022] [Accepted: 06/17/2022] [Indexed: 11/28/2022]
Abstract
Numerous studies have attempted to restore the function of the tumour suppressor p53 as an anticancer strategy through gene delivery. However, most studies employed non-bacterial vectors to deliver p53. Various facultative and obligate anaerobic bacteria have been proposed as vectors because of their intrinsic tumour targeting ability and antitumour activity. Salmonella enterica Typhimurium is the most studied bacterial vector in anticancer therapy. We used the previously designed χ11218 strain of S. enterica Typhimurium, displaying regulated delayed lysis, as a vector for delivering p53 to human bladder carcinoma cells, restoring wild-type p53 protein function. We cloned p53 into pYA4545 (containing a eukaryotic expression system) to generate the χ11218 pYA4545p53 strain. Cloning of p53 did not affect the growth or interfere with the invasive and replicative capacity of χ11218 bacteria in tumour cells. Human bladder carcinoma cells (expressing mutated p53) transfected with pYA4545p53 showed a significant increase in the expression of p53 protein. We demonstrated that p53 supplied by χ11218 significantly decreased the viability of human bladder cancer cells in a dose-dependent manner. This study demonstrates the applicability of the attenuated χ11218 strain as a vector for DNA plasmids expressing tumour suppressor genes.
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Affiliation(s)
- Genesy Pérez Jorge
- Department of Genetics, Evolution, Microbiology, and Immunology, Tropical Disease Laboratory, Institute of Biology, University of Campinas - UNICAMP, 13083-970, Campinas, SP, Brazil
| | | | - Yessica Paola Jaimes-Florez
- Department of Genetics, Evolution, Microbiology, and Immunology, Tropical Disease Laboratory, Institute of Biology, University of Campinas - UNICAMP, 13083-970, Campinas, SP, Brazil
| | - Wagner José Fávaro
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas - UNICAMP, 13083-970, Campinas, SP, Brazil
| | - Marcelo Bispo de Jesus
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas - UNICAMP, 13083-970, Campinas, SP, Brazil
| | - Marcelo Brocchi
- Department of Genetics, Evolution, Microbiology, and Immunology, Tropical Disease Laboratory, Institute of Biology, University of Campinas - UNICAMP, 13083-970, Campinas, SP, Brazil
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Control of Francisella tularensis Virulence at Gene Level: Network of Transcription Factors. Microorganisms 2020; 8:microorganisms8101622. [PMID: 33096715 PMCID: PMC7588896 DOI: 10.3390/microorganisms8101622] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/14/2020] [Accepted: 10/18/2020] [Indexed: 02/07/2023] Open
Abstract
Regulation of gene transcription is the initial step in the complex process that controls gene expression within bacteria. Transcriptional control involves the joint effort of RNA polymerases and numerous other regulatory factors. Whether global or local, positive or negative, regulators play an essential role in the bacterial cell. For instance, some regulators specifically modify the transcription of virulence genes, thereby being indispensable to pathogenic bacteria. Here, we provide a comprehensive overview of important transcription factors and DNA-binding proteins described for the virulent bacterium Francisella tularensis, the causative agent of tularemia. This is an unexplored research area, and the poorly described networks of transcription factors merit additional experimental studies to help elucidate the molecular mechanisms of pathogenesis in this bacterium, and how they contribute to disease.
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