1
|
Delmon C, Ouk C, Casellas M, Prorot A. Evaluation of the additive effects of volatile fatty acids and moderate heat treatment for enhancing the inactivation of vegetative cells and spores of Clostridium perfringens by flow cytometry. Anaerobe 2023; 84:102802. [PMID: 38007214 DOI: 10.1016/j.anaerobe.2023.102802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 11/12/2023] [Accepted: 11/15/2023] [Indexed: 11/27/2023]
Abstract
OBJECTIVES Clostridium perfringens is a well-known spore-forming bacterium that can resist the environment. A mixture of volatile fatty acids or thermal treatments can interact with these bacteria. The aim of this study was to evaluate the effects of different volatile fatty acid concentrations and moderate heat treatment on Clostridium perfringens sporulation. METHODS A pure culture of Clostridium perfringens type A in Duncan Strong medium was treated with a mixture of volatile fatty acids at several concentrations. A thermal treatment was also tested. To evaluate the effects, a double staining method was employed, and treatments on Clostridium perfringens were analysed by flow cytometry. RESULTS Moderate heat treatment destroyed vegetative forms but had no effect on sporulating forms. Volatile fatty acids combined with moderate heat treatment inhibited Clostridium perfringens sporulation. CONCLUSIONS The use of flow cytometry as an original method for evaluating the treatment of Clostridium perfringens is of interest because of its simplicity, short time to obtain results, and the level of information provided on the microbial population (impact on metabolism). A combination of mild treatments (moderate heat treatment + volatile fatty acids) to decrease the Clostridium perfringens concentration when these bacteria sporulate is a very promising finding for inhibiting Clostridium perfringens propagation.
Collapse
Affiliation(s)
- Cedric Delmon
- E2Lim laboratory, UR 24133, University of Limoges, Limoges, France.
| | - Catherine Ouk
- UMR CNRS 7276, INSERM 1262, Faculté de Médecine, Université de Limoges, F-87025, Limoges Cedex, France.
| | - Magali Casellas
- E2Lim laboratory, UR 24133, University of Limoges, Limoges, France.
| | - Audrey Prorot
- E2Lim laboratory, UR 24133, University of Limoges, Limoges, France.
| |
Collapse
|
2
|
Miyake M, Oda Y, Owari T, Iida K, Ohnishi S, Fujii T, Nishimura N, Miyamoto T, Shimizu T, Ohnishi K, Hori S, Morizawa Y, Gotoh D, Nakai Y, Torimoto K, Tanaka N, Fujimoto K. Probiotics enhances anti-tumor immune response induced by gemcitabine plus cisplatin chemotherapy for urothelial cancer. Cancer Sci 2023; 114:1118-1130. [PMID: 36398663 PMCID: PMC9986082 DOI: 10.1111/cas.15666] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/04/2022] [Accepted: 11/15/2022] [Indexed: 11/19/2022] Open
Abstract
Chemotherapy drugs, such as gemcitabine and cisplatin (GC), are frequently administered to patients with advanced urothelial carcinoma, however the influence of the gut microbiota on their action is unclear. Thus, we investigated the effects of GC on the gut microbiome and determined whether oral supplementation with a probiotics mixture of Lactobacillus casei Shirota and Bifidobacterium breve enhanced the anti-tumor immune response. After subcutaneous inoculation with MBT2 murine bladder cancer cells, syngenic C3H mice were randomly allocated into eight groups. The gut microbiome cluster pattern was altered in both the GC and oral probiotics groups (p = 0.025). Both tumor-bearing conditions (no treatment) and GC chemotherapy influenced Pseudoclostridium, Robinsoniella, Merdimonas, and Phocea in the gut. Furthermore, comparison of the GC-treated and GC + probiotics groups revealed an association of four methyltransferase family enzymes and two short-change fatty acid-related enzymes with oral probiotics use. A significant difference in tumor volume was observed between the GC and GC + probiotics groups at week 2 of treatment. Additionally, decreased recruitment of cancer-associated fibroblasts and regulatory T cells, and activation of CD8+ T cells and dendritic cells were observed in the tumor microenvironment. Our findings reveal the positive effects of a probiotics mixture of Lactobacillus and Bifidobacterium in enhancing anti-tumor effects through the gut-tumor immune response axis. Future clinical trials are needed to evaluate the full benefits of this novel supplement with oral probiotics in patients with advanced urothelial carcinoma.
Collapse
Affiliation(s)
- Makito Miyake
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Yuki Oda
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Takuya Owari
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Kota Iida
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Sayuri Ohnishi
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Tomomi Fujii
- Diagnostic Pathology, Nara Medical University, Kashihara, Nara, Japan
| | | | - Tatsuki Miyamoto
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Takuto Shimizu
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Kenta Ohnishi
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Shunta Hori
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Yosuke Morizawa
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Daisuke Gotoh
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Yasushi Nakai
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Kazumasa Torimoto
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| | - Nobumichi Tanaka
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan.,Prostate Brachytherapy, Nara Medical University, Kashihara, Nara, Japan
| | - Kiyohide Fujimoto
- Department of Urology, Nara Medical University, Kashihara, Nara, Japan
| |
Collapse
|
3
|
ACETONE-BUTYL FERMENTATION PECULIARITIES OF THE BUTANOL STRAINS -PRODUCER. BIOTECHNOLOGIA ACTA 2022. [DOI: 10.15407/biotech15.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of this review was to generalize and analyze the features of acetone-butyl fermentation as a type of butyric acid fermentation in the process of obtaining butanol as an alternative biofuel. Methods. The methods of analysis and generalization of analytical information and literature sources were used in the review. The results were obtained using the following methods such as microbiological (morphological properties of strains), chromatographic (determination of solvent concentration), spectrophotometric (determination of bacterial concentration), and molecular genetic (phylogenetic analysis of strains). Results. The process of acetone-butyl fermentation was analyzed, the main producer strains were considered, the features of the relationship between alcohol formation and sporulation were described, the possibility of butanol obtaining from synthesis gas was shown, and the features of the industrial production of butanol were considered. Conclusions. The features of the mechanism of acetone-butyl fermentation (the relationships between alcohol formation and sporulation, the duration of the acid-forming and alcohol-forming stages during batch fermentation depending on the change in the concentration of H2, CO, partial pressure, organic acids and mineral additives) and obtaining an enrichment culture during the production of butanol as an alternative fuel were shown. The possibility of using synthesis gas as a substrate for reducing atmospheric emissions during the fermentation process was shown. The direction of increasing the productivity of butanol-producing strains to create a competitive industrial biofuel technology was proposed.
Collapse
|