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Fuochi V, Spampinato M, Distefano A, Palmigiano A, Garozzo D, Zagni C, Rescifina A, Li Volti G, Furneri PM. Soluble peptidoglycan fragments produced by Limosilactobacillus fermentum with antiproliferative activity are suitable for potential therapeutic development: A preliminary report. Front Mol Biosci 2023; 10:1082526. [PMID: 36876040 PMCID: PMC9975264 DOI: 10.3389/fmolb.2023.1082526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 01/31/2023] [Indexed: 02/17/2023] Open
Abstract
Currently, the use of probiotic strains and their products represents a promising innovative approach as an antagonist treatment against many human diseases. Previous studies showed that a strain of Limosilactobacillus fermentum (LAC92), previously defined as Lactobacillus fermentum, exhibited a suitable amensalistic property. The present study aimed to purify the active components from LAC92 to evaluate the biological properties of soluble peptidoglycan fragments (SPFs). The cell-free supernatant (CFS) and bacterial cells were separated after 48 h of growth in MRS medium broth and treated for isolation of SPFs. Antimicrobial activity and proliferation analysis on the human cell line HTC116 were performed using technologies such as xCELLigence, count and viability, and clonogenic analysis. MALDI-MS investigation and docking analysis were performed to determine the molecular structure and hypothetical mode of action, respectively. Our results showed that the antimicrobial activity was mainly due to SPFs. Moreover, the results obtained when investigating the SPF effect on the cell line HCT116 showed substantial preliminary evidence, suggesting their significant cytostatic and quite antiproliferative properties. Although MALDI was unable to identify the molecular structure, it was subsequently revealed by analysis of the bacterial genome. The amino acid structure is called peptide 92. Furthermore, we confirmed by molecular docking studies the interaction of peptide 92 with MDM2 protein, the negative regulator of p53. This study showed that SPFs from the LAC92 strain exerted anticancer effects on the human colon cancer HCT116 cell line via antiproliferation and inducing apoptosis. These findings indicated that this probiotic strain might be a potential candidate for applications in functional products in the future. Further examination is needed to understand the specific advantages of this probiotic strain and improve its functional features to confirm these data. Moreover, deeper research on peptide 92 could increase our knowledge and help us understand if it will be possible to apply to specific diseases such as CRC.
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Affiliation(s)
- Virginia Fuochi
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università di Catania, Catania, Italy.,Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
| | - Mariarita Spampinato
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università di Catania, Catania, Italy
| | - Alfio Distefano
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università di Catania, Catania, Italy
| | - Angelo Palmigiano
- CNR, Institute for Polymers, Composites and Biomaterials (IPCB), Catania, Italy
| | - Domenico Garozzo
- CNR, Institute for Polymers, Composites and Biomaterials (IPCB), Catania, Italy
| | - Chiara Zagni
- Dipartimento di Scienze del Farmaco e della Salute, Università di Catania, Catania, Italy
| | - Antonio Rescifina
- Dipartimento di Scienze del Farmaco e della Salute, Università di Catania, Catania, Italy
| | - Giovanni Li Volti
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università di Catania, Catania, Italy.,Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
| | - Pio Maria Furneri
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università di Catania, Catania, Italy.,Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
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Saadat M, Gandomkar M, Bahreinipour A, Bandehpour M, Kazemi B, Mosaffa N. Evaluation of the designed multi-epitope protein of Brucella melitensis in guinea pigs. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:833-841. [PMID: 34630961 PMCID: PMC8487608 DOI: 10.22038/ijbms.2021.54667.12267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 05/01/2021] [Indexed: 11/06/2022]
Abstract
Objectives One of the causes of human and animal zoonotic infections is Brucella melitensis, which is transmitted to humans through dairy products. It seems for prevention of human infection we might protect the livestock by an efficient protein as a vaccine candidate. For this purpose, the use of immunogenic proteins of bacteria is able to create immunity the same as the traditional vaccines. Materials and Methods In this study, by finding the immunogenic antigens of this bacterium by 2-dimensional gel electrophoresis and MALDI-TOF methods and also the proteins reported in other studies, we found the epitopes of the bacterial antigenic determinants in silico. Nineteen peptides of T and B epitopes were selected. They were ligated with linkers and after gene synthesis, the designed polypeptide was expressed in Escherichia coli BL21. The purified recombinant MEL protein mixed with chitin was injected subcutaneously into three 300 g male guinea pigs three times. Also, PBS control and Rev.1 commercial vaccine groups were considered. Results The results show that MEL polypeptide is equal to the Rev.1 vaccine in stimulating secretion of IFNγ and IL2 and specific IgG. High levels of IL-2 emphasize the activation of the cellular immunity, and in particular comparison of PI in guinea pig's spleen cells treated with recombinant MEL protein on days 0 and 5 show that it has significant proliferation compared with PBS unstimulated cells. Conclusion This recombinant protein could be a subunit protein with sufficient efficiency in stimulating the humoral and cellular-mediated immune system against B. melitansis.
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Affiliation(s)
- Mina Saadat
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Masoud Gandomkar
- Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Mojgan Bandehpour
- Department of Medical Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bahram Kazemi
- Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nariman Mosaffa
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Darbandi A, Ghanavati R, Asadi A, Mirklantari S, Hasannejad-Bibalan M, Lohrasbi V, Sadeghi Kalani B, Rohani M, Talebi M, Pourshafie MR. Prevalence of bacteriocin genes in Lactobacillus strains isolated from fecal samples of healthy individuals and their inhibitory effect against foodborne pathogens. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2021; 24:1117-1125. [PMID: 34804429 PMCID: PMC8591760 DOI: 10.22038/ijbms.2021.53299.11998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 07/14/2021] [Indexed: 12/05/2022]
Abstract
OBJECTIVES Foodborne diseases are considered as an important public health issue. The purpose of the current study was to isolate Lactobacillus spp. strains from fecal samples, investigate their antimicrobial properties, and assess the expression of genes encoding bacteriocin in co-culture of Lactobacillus with enteric pathogens. MATERIALS AND METHODS Fecal samples of healthy people were collected. Human colon adenocarcinoma cell line Caco-2 was used to examine Lactobacillus strains adherence capacity. Quantitative real-time reverse transcription PCR (qRT-PCR) was used to determine bacteriocin-encoding genes expression in co-culture of the selected Lactobacillus strain with Salmonella, Shigella, and two diarrheagenic Escherichia coli serotypes during 4, 6, and 24 hr of incubation. RESULTS The selected L. plantarum strain was able to inhibit four foodborne pathogens in both methods. L. plantarum No.14 exhibited the highest ability to adhere to Caco-2 cells. In this study, pln F, sak P, pln I, pln B, and pln J genes of L. plantarum No.14 were upregulated in co-culture of L. plantarum No.14 with diarrheagenic E. coli serotypes. In addition, acd, Lactacin F, sak P, pln J, pln EF, and pln NC8 genes as well as pln NC8 and pln A genes mRNA levels were significantly increased in co-culture of L. plantarum No.14 with Shigella dysenteriae, and Salmonella typhi, respectively, during 24 hrs of incubation. CONCLUSION Other studied genes were down-regulated during the incubation time. The selected L. plantarum strains could be served as alternative antimicrobial agents against pathogens which could contaminate foodstuffs and are responsible for human diseases.
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Affiliation(s)
- Atieh Darbandi
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran, Microbial Biotechnology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | | | - Arezoo Asadi
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran, Microbial Biotechnology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | - Shiva Mirklantari
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran, Microbial Biotechnology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | | | - Vahid Lohrasbi
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran, Microbial Biotechnology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | - Behrooz Sadeghi Kalani
- Department of Microbiology, Faculty of Medicine, Ilam University of Medical Sciences, Ilam, Iran, Clinical Microbiology Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Mahdi Rohani
- Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran
| | - Malihe Talebi
- Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran, Microbial Biotechnology Research Centre, Iran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Pourshafie
- Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran,Corresponding author: Mohammad Reza Pourshafie. Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran. Tel: +98-21-66405534;
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