- Profiling of Virulence-associated Factors in Shigella Species Isolated from Acute Pediatric Diarrheal Samples in Tehran, Iran
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Sajad Yaghoubi, Reza Ranjbar, Mohammad Mehdi Soltan Dallal, Somayeh Yasliani Fard, Mohammad Hasan Shirazi, Mahmood Mahmoudi
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Osong Public Health Res Perspect. 2017;8(3):220-226. Published online June 30, 2017
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DOI: https://doi.org/10.24171/j.phrp.2017.8.3.09
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The genus Shigella comprises the most infectious and diarrheagenic bacteria causing severe diseases, mostly in children under five years of age. This study aimed to detect nine virulence genes (ipaBCD, VirA, sen, set1A, set1B, ial, ipaH, stx, and sat) in Shigella species (spp.) using multiplex polymerase chain reaction (MPCR) and to determine the relation of Shigella spp. from pediatric diarrheal samples with hospitalization and bloody diarrhea in Tehran, Iran. MethodsShigella spp. were isolated and identified using standard microbiological and serological methods. The virulence genes were detected using MPCR. ResultsSeventy-five Shigella spp. (40 S. sonnei, 33 S. flexneri, 1 S. dysenteriae, and 1 S. boydii) were isolated in this study. The prevalence of ial, sen, sat, set1A, and set1B was 74.7%, 45.4%, 28%, 24%, and 24%, respectively. All S. flexneri isolates, while no S. sonnei, S. dysenteriae, or S. boydii isolates, contained sat, set1A, and set1B. All isolates were positive for ipaH, ipaBCD, and virA, while one (1.4%) of the isolates contained stx. The highest prevalence of virulence determinants was found in S. flexneri serotype IIa. Nineteen (57.6%) of 33 S. flexneri isolates were positive for ipaBCD, ipaH, virA, ial, and sat. The sen determinants were found to be statistically significantly associated with hospitalization and bloody diarrhea (p = 0.001). ConclusionThis study revealed a high prevalence of enterotoxin genes in S. flexneri, especially in serotype 2a, and has presented relations between a few clinical features of shigellosis and numerous virulence determinants of clinical isolates of Shigella spp.
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- The Effect of Lactobacillus acidophilus PTCC 1643 on Cultured Intestinal Epithelial Cells Infected with Salmonella enterica serovar Enteritidis
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Mona Moshiri, Mohammad Mehdi Soltan Dallal, Farhad Rezaei, Masoumeh Douraghi, Laleh Sharifi, Zahra Noroozbabaei, Mehrdad Gholami, Abbas Mirshafiey
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Osong Public Health Res Perspect. 2017;8(1):54-60. Published online February 28, 2017
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DOI: https://doi.org/10.24171/j.phrp.2017.8.1.07
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3,745
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Gastrointestinal disorders caused by Salmonella enterica serovar Enteritidis (SesE) are a significant health problem around the globe. Probiotic bacteria have been shown to have positive effects on the immune responses. Lactobacillus acidophilus was examined for its capability to influence the innate immune response of HT29 intestinal epithelial cells towards SesE. The purpose of this work was to assess the effect of L. acidophilus PTCC 1643 on cultured intestinal epithelial cells infected with SesE. MethodsHT29 cells were cultured in Roswell Park Memorial Institute medium supplemented with 10% fetal bovine serum and 1% penicillin/streptomycin. The cells were treated with L. acidophilus PTCC 1643 after or before challenge with SesE. At 2 and 4 hours post-infection, we measured changes in the expression levels of TLR2 and TLR4 via real-time polymerase chain reaction. ResultsTreatment with L. acidophilus inhibited SesE-induced increases in TLR2 and TLR4 expression in the infected HT29 cells. Moreover, the expression of TLR2 and TLR4 in cells that were pretreated with L. acidophilus and then infected with SesE was significantly higher than that in cells infected with SesE without pretreatment. Taken together, the results indicated that L. acidophilus had an anti-inflammatory effect and modulated the innate immune response to SesE by influencing TLR2 and TLR4 expression. ConclusionOur findings suggested that L. acidophilus PTCC 1643 was able to suppress inflammation caused by SesE infection in HT29 cells and reduce TLR2 and TLR4 expression. Additional in vivo and in vitro studies are required to further elucidate the mechanisms underlying this anti-inflammatory effect.
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Citations
Citations to this article as recorded by - Lactobacillus acidophilus ATCC 4356 Exopolysaccharides Suppresses Mediators of Inflammation through the Inhibition of TLR2/STAT-3/P38-MAPK Pathway in DEN-Induced Hepatocarcinogenesis in Rats
Ola M. S. Khedr, Sawsan M. El-Sonbaty, Fatma S. M. Moawed, Eman I. Kandil, Basma E. Abdel-Maksoud
Nutrition and Cancer.2022; 74(3): 1037. CrossRef - Osmoporation is a versatile technique to encapsulate fisetin using the probiotic bacteria Lactobacillus acidophilus
Eduardo Wagner Vasconcelos de Andrade, Sebastien Dupont, Laurent Beney, Roberta Targino Hoskin, Márcia Regina da Silva Pedrini
Applied Microbiology and Biotechnology.2022; 106(3): 1031. CrossRef - The Game for Three: Salmonella–Host–Microbiota Interaction Models
Krzysztof Grzymajlo
Frontiers in Microbiology.2022;[Epub] CrossRef - The Functional Roles of Lactobacillus acidophilus in Different Physiological and Pathological Processes
Huijuan Gao, Xin Li, Xiatian Chen, Deng Hai, Chuang Wei, Lei Zhang, Peifeng Li
Journal of Microbiology and Biotechnology.2022; 32(10): 1226. CrossRef - Improving bioactive properties of peach juice using Lactobacillus strains fermentation: Antagonistic and anti-adhesion effects, anti-inflammatory and antioxidant properties, and Maillard reaction inhibition
Seyed Mohammad Bagher Hashemi, Dornoush Jafarpour, Mohammad Jouki
Food Chemistry.2021; 365: 130501. CrossRef - The immune regulatory role of Lactobacillus acidophilus: An updated meta-analysis of randomized controlled trials
Wei Zhao, Yangshuo Liu, Lai-Yu Kwok, Tiequan Cai, Wenyi Zhang
Food Bioscience.2020; 36: 100656. CrossRef - Gene expression changes as predictors of the immune-modulatory effects of probiotics: Towards a better understanding of strain-disease specific interactions
Frida Gorreja
NFS Journal.2019; 14-15: 1. CrossRef - A review on anti-adhesion therapies of bacterial diseases
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