Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105559
Asmaa Ibrahim , Nancy O. kamel , Fatma Rageh , Rasha Elgamal , Mohamed A. Sakr , Eman M. Osman , Samar s. Ahmed , Hend A. Yassin , Yasmine N. Kamel , Reham F. Othman , Manar Ezzelarab Ramadan
The study assesses toxoplasmosis seroprevalence in Type 2 Diabetes Mellitus, identifies the potential risk factors, and examines IL-1β expression levels and polymorphisms in those infected with T. gondii.
One hundred healthy controls and 200 diabetic patients participated in the study. Diagnosis was made by Immunoassay to measure antibodies of T. gondii, IgM, and IgG, and molecular by targeting the 529 RE gene. Quantitative measurement of IL-1β levels was done, and genetic polymorphisms were assessed.
Among diabetic patients, 61.0 % were seropositive for T. gondii IgG, compared to 36.0 % in healthy controls. Significant associations were found with IgG and IgM (P = 0.0001, 0.022), respectively. Patients with diabetes and toxoplasmosis had significantly high levels of IL-1β (P = 0.0003). The +3954C/T variant showed a higher prevalence of CT and lower TT genotypes in T2DM patients, P = 0.017, 0.003, respectively. The CT genotype is considered a genetic risk factor for diabetic patients, and the TT genotype and T allele may increase susceptibility to infection with toxoplasmosis. The prevalence of toxoplasmosis in T2DM, levels of IL-1β, and +3954C/T polymorphism seem to be important factors for developing complications in diabetic patients infected with toxoplasmosis.
{"title":"Investigating the possible role of toxoplasmosis and Interleukin-1β variants on the immune response in Egyptian diabetic patients","authors":"Asmaa Ibrahim , Nancy O. kamel , Fatma Rageh , Rasha Elgamal , Mohamed A. Sakr , Eman M. Osman , Samar s. Ahmed , Hend A. Yassin , Yasmine N. Kamel , Reham F. Othman , Manar Ezzelarab Ramadan","doi":"10.1016/j.micinf.2025.105559","DOIUrl":"10.1016/j.micinf.2025.105559","url":null,"abstract":"<div><div>The study assesses toxoplasmosis seroprevalence in Type 2 Diabetes Mellitus, identifies the potential risk factors, and examines IL-1β expression levels and polymorphisms in those infected with <em>T. gondii</em>.</div><div>One hundred healthy controls and 200 diabetic patients participated in the study. Diagnosis was made by Immunoassay to measure antibodies of <em>T. gondii</em>, IgM, and IgG, and molecular by targeting the 529 RE gene. Quantitative measurement of IL-1β levels was done, and genetic polymorphisms were assessed.</div><div>Among diabetic patients, 61.0 % were seropositive for <em>T. gondii</em> IgG, compared to 36.0 % in healthy controls. Significant associations were found with IgG and IgM (<em>P</em> = 0.0001, 0.022), respectively. Patients with diabetes and toxoplasmosis had significantly high levels of IL-1β (<em>P</em> = 0.0003). The +3954C/T variant showed a higher prevalence of CT and lower TT genotypes in T2DM patients, <em>P</em> = 0.017, 0.003, respectively. The CT genotype is considered a genetic risk factor for diabetic patients, and the TT genotype and T allele may increase susceptibility to infection with toxoplasmosis. The prevalence of toxoplasmosis in T2DM, levels of IL-1β, and +3954C/T polymorphism seem to be important factors for developing complications in diabetic patients infected with toxoplasmosis.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105559"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105560
Min-Kyung Joo , Xiaoyang Ma , Jung-Woo Shin , Yoon-Jung Shin , Dong-Hyun Kim
Clostridioides difficile causes severe colitis, which induces neuroinflammation and psychiatric disorder. In a preliminary study, we isolated Clostridium symbiosum from the stools of patients with ulcerative colitis. Therefore, we first examined whether oral infection with C. difficile or C. symbiosum could induce colitis and depression in male mice. Orally gavaged C. difficile or C. symbiosum caused diarrhea, bodyweight loss, depression/anxiety-like behavior, and tumor necrosis factor (TNF)-α and interleukin (IL)-6 overexpression in the colon and hippocampus in the pseudo-germ-free (PGF) and specific germ-free (SPF) mice. However, healthy volunteer microbiota-derived Lactococcus lactis P22 and/or Bifidobacterium longum P26 suppressed C. difficile or C. symbiosum growth and TNF-α expression in macrophage cells. They alleviated C. difficile- or C. symbiosum-induced bodyweight loss, diarrhea, and neurobehavioral changes in PGF and SPF mice, while reducing pro-inflammatory cytokines (IL-1β, IL-6, and TNF-α) levels in the colon and in the hippocampus. These findings suggest that C. difficile or C. symbiosum can cause colitis and depression/anxiety. Oral administration of P22 and/or P26 may alleviate gut bacteria-induced gut inflammation and depression/anxiety through the inhibition of their growth and inflammatory response.
{"title":"Lactococcus lactis and Bifidobacterium longum attenuate Clostridioides difficile- or Clostridium symbiosum-induced colitis and depression/anxiety-like behavior in male mice","authors":"Min-Kyung Joo , Xiaoyang Ma , Jung-Woo Shin , Yoon-Jung Shin , Dong-Hyun Kim","doi":"10.1016/j.micinf.2025.105560","DOIUrl":"10.1016/j.micinf.2025.105560","url":null,"abstract":"<div><div><em>Clostridioides difficile</em> causes severe colitis, which induces neuroinflammation and psychiatric disorder. In a preliminary study, we isolated <em>Clostridium symbiosum</em> from the stools of patients with ulcerative colitis. Therefore, we first examined whether oral infection with <em>C. difficile</em> or <em>C. symbiosum</em> could induce colitis and depression in male mice. Orally gavaged <em>C. difficile</em> or <em>C. symbiosum</em> caused diarrhea, bodyweight loss, depression/anxiety-like behavior, and tumor necrosis factor (TNF)-α and interleukin (IL)-6 overexpression in the colon and hippocampus in the pseudo-germ-free (PGF) and specific germ-free (SPF) mice. However, healthy volunteer microbiota-derived <em>Lactococcus lactis</em> P22 and/or <em>Bifidobacterium longum</em> P26 suppressed <em>C. difficile</em> or <em>C. symbiosum</em> growth and TNF-α expression in macrophage cells. They alleviated <em>C. difficile</em>- or <em>C. symbiosum</em>-induced bodyweight loss, diarrhea, and neurobehavioral changes in PGF and SPF mice, while reducing pro-inflammatory cytokines (IL-1β, IL-6, and TNF-α) levels in the colon and in the hippocampus. These findings suggest that <em>C. difficile</em> or <em>C. symbiosum</em> can cause colitis and depression/anxiety. Oral administration of P22 and/or P26 may alleviate gut bacteria-induced gut inflammation and depression/anxiety through the inhibition of their growth and inflammatory response.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105560"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144959542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105544
Nayara I. Medeiros , Daniela Silva Oliveira , Karine S. Ferreira , Tatjana S.L. Keesen , Luiz Paulo C. Rocha , Giovane R. Sousa , Marcos P.S. Damasio , Rafaelle C.G. Fares-Gusmao , Ana T. Chaves , Fernanda F. De Araújo , Walderez O. Dutra , Rodrigo Correa-Oliveira , Manoel O.C. Rocha , Juliana A.S. Gomes
The forkhead box protein 3 (FOXP3) transcription factor is the main marker of regulatory T-cell (Treg) development and activation, a subpopulation involved in immune system regulation, self-tolerance, and protection against infections. We previously showed that Treg cells control the exacerbated immune response and morbidity in chronic Chagas disease, by modulating the cytokine environment and killing effector cells. Although FOXP3 gene polymorphisms have already been studied in several diseases, their role in Chagas disease is underreported. This study investigated FOXP3 gene polymorphism (rs3761548) in patients with Chronic Chagas disease and the association between FOXP3 polymorphisms (−3279 C/T and −3499 G/T) with clinical forms of the disease. We show that the −3499 G/T polymorphism of the heterozygous genotype (GT) is twice as prevalent in women with indeterminate clinical form (IND). Other analyses showed that the polymorphic allele (T + −3499 G/T) is high in women with IND, suggesting a protective role for this polymorphism. This pattern is associated with high frequency of FOXP3 in Treg cells in individuals with the IND form. Our results suggest that −3499 G/T polymorphism in the FOXP3 gene may play an important role in T. cruzi infection, contributing to control and the development of the IND clinical form.
{"title":"FOXP3 gene polymorphisms are associated with indeterminate clinical form of Chagas disease","authors":"Nayara I. Medeiros , Daniela Silva Oliveira , Karine S. Ferreira , Tatjana S.L. Keesen , Luiz Paulo C. Rocha , Giovane R. Sousa , Marcos P.S. Damasio , Rafaelle C.G. Fares-Gusmao , Ana T. Chaves , Fernanda F. De Araújo , Walderez O. Dutra , Rodrigo Correa-Oliveira , Manoel O.C. Rocha , Juliana A.S. Gomes","doi":"10.1016/j.micinf.2025.105544","DOIUrl":"10.1016/j.micinf.2025.105544","url":null,"abstract":"<div><div><span><span><span>The forkhead box protein<span> 3 (FOXP3) transcription factor is the main marker of regulatory T-cell (Treg) development and activation, a subpopulation involved in immune system regulation, self-tolerance, and protection against infections. We previously showed that Treg cells control the exacerbated immune response and morbidity in chronic </span></span>Chagas disease<span>, by modulating the cytokine environment and killing effector cells. Although FOXP3 </span></span>gene polymorphisms<span> have already been studied in several diseases, their role in Chagas disease<span> is underreported. This study investigated FOXP3 gene polymorphism (rs3761548) in patients with Chronic Chagas disease and the association between FOXP3 polymorphisms (−3279 C/T and −3499 G/T) with clinical forms of the disease. We show that the −3499 G/T polymorphism of the heterozygous genotype (GT) is twice as prevalent in women with indeterminate clinical form (IND). Other analyses showed that the polymorphic allele (T + −3499 G/T) is high in women with IND, suggesting a protective role for this polymorphism. This pattern is associated with high frequency of FOXP3 in Treg cells in individuals with the IND form. Our results suggest that −3499 G/T polymorphism in the FOXP3 gene may play an important role in </span></span></span><em>T. cruzi</em> infection, contributing to control and the development of the IND clinical form.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105544"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144340192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105547
Maple Goh , Peter J. Hotez
The recent termination of the U.S. Government's neglected topical diseases (NTD) mass treatment program, following similar cuts by the UK, threatens decades of progress. Without a strategic reset, NTDs may re-emerge, exacerbating poverty across Africa and beyond. We call for a broadened donor base and reframing NTD control as a shared global interest, especially as NTDs rise in G20 nations due to climate change and urbanization. This moment demands investment in sustainable tools, like NextGen vaccines and biologics, and greater leadership from G20 countries. While USAID's exit is a setback, opportunities arise for decolonizing global health and fostering new partnerships.
{"title":"Averting collapse: Reimagining the NTDs ecosystem through G20 health diplomacy and science innovation","authors":"Maple Goh , Peter J. Hotez","doi":"10.1016/j.micinf.2025.105547","DOIUrl":"10.1016/j.micinf.2025.105547","url":null,"abstract":"<div><div>The recent termination of the U.S. Government's neglected topical diseases (NTD) mass treatment program, following similar cuts by the UK, threatens decades of progress. Without a strategic reset, NTDs may re-emerge, exacerbating poverty across Africa and beyond. We call for a broadened donor base and reframing NTD control as a shared global interest, especially as NTDs rise in G20 nations due to climate change and urbanization. This moment demands investment in sustainable tools, like NextGen vaccines and biologics, and greater leadership from G20 countries. While USAID's exit is a setback, opportunities arise for decolonizing global health and fostering new partnerships.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105547"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144682786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105540
Jingyu Zhao , Wei Fang , Yangjie Gao , Zhenzong Fa , Guizhen Wang , Julin Gu
This study aims to investigate the molecular mechanisms by which Cryptococcus neoformans (C. neoformans) crosses the blood-brain barrier (BBB), focusing specifically on the role of the epidermal growth factor receptor (EGFR) and its ligand, HB-EGF. Cryptococcal meningitis, caused by C. neoformans, has a high mortality rate and poses a significant threat to global public health. Research indicates that C. neoformans employs various strategies to cross the BBB, with transcellular transport being particularly critical. We observed that C. neoformans infection significantly upregulates the expression and phosphorylation of EGFR in brain microvascular endothelial cells (BMECs). Silencing EGFR using siRNA technology resulted in a marked decrease in the ability of C. neoformans to traverse the BMEC monolayer. Furthermore, C. neoformans infection also upregulates EGFR ligands, such as HB-EGF, in BMECs, thereby activating the EGFR signaling pathway. This activation involves the engagement of ADAM family metalloproteinases and the metalloprotease Mpr1 from C. neoformans. The findings of this study underscore the critical role of the host EGFR signaling pathway in the ability of C. neoformans to cross the BBB and highlight potential targets for developing new therapies for infectious meningitis.
{"title":"Cryptococcus neoformans and the EGFR Puzzle: Uncovering a Novel mechanism for blood-brain barrier crossing","authors":"Jingyu Zhao , Wei Fang , Yangjie Gao , Zhenzong Fa , Guizhen Wang , Julin Gu","doi":"10.1016/j.micinf.2025.105540","DOIUrl":"10.1016/j.micinf.2025.105540","url":null,"abstract":"<div><div>This study aims to investigate the molecular mechanisms by which <span><span>Cryptococcus neoformans</span></span> (<em>C. neoformans</em><span>) crosses the blood-brain barrier (BBB), focusing specifically on the role of the epidermal growth factor receptor<span> (EGFR) and its ligand, HB-EGF. Cryptococcal meningitis, caused by </span></span><em>C. neoformans</em><span>, has a high mortality rate<span> and poses a significant threat to global public health. Research indicates that </span></span><em>C. neoformans</em><span> employs various strategies to cross the BBB, with transcellular transport being particularly critical. We observed that </span><em>C. neoformans</em><span><span> infection significantly upregulates the expression and phosphorylation of EGFR in brain microvascular endothelial cells (BMECs). Silencing EGFR using </span>siRNA technology resulted in a marked decrease in the ability of </span><em>C. neoformans</em> to traverse the BMEC monolayer. Furthermore, <em>C. neoformans</em><span> infection also upregulates EGFR ligands, such as HB-EGF, in BMECs, thereby activating the EGFR signaling pathway<span>. This activation involves the engagement of ADAM<span> family metalloproteinases and the metalloprotease Mpr1 from </span></span></span><em>C. neoformans</em><span>. The findings of this study underscore the critical role of the host EGFR signaling pathway in the ability of </span><em>C. neoformans</em> to cross the BBB and highlight potential targets for developing new therapies for infectious meningitis.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105540"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144248714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Neutrophils play a pivotal role in the innate immune response to bacterial infection, being one of the first immune cells to reach infectious sites. Bacterial infection may induce neutrophil degranulation, production of neutrophil extracellular traps (NETs), or pathogen phagocytosis. While LC3 is typically linked to autophagy, here we observed a non-canonical role of LC3 when peripheral neutrophils interact with bacteria both in vivo and in vitro, using Shigella spp. as a model. Upon incubation with neutrophils, extracellular bacteria became labelled by LC3 (LC3+) along with granules-localised antimicrobial components, such as lactotransferrin, defensin, elastase, and myeloperoxidase, as demonstrated by mass spectrometry. Co-localisation of LC3 and plasma membrane-specific dyes indicated that neutrophil plasma membrane-derived elongated structures covering bacteria were responsible for the labelling. This phenomenon was associated with bacterial growth restriction and bacterial cell-death induction. Testing with specific inhibitors demonstrated that this labelling was dependent on functional V-type ATP synthase. Covering bacteria with membrane-derived elongated structures enhanced the subsequent phagocytosis of bacteria by neutrophils. Finally, the LC3 labelling rate increased with higher bacterial burden. In conclusion, we propose that this defense mechanism is beneficial when the burden of bacterial infection overwhelms neutrophils' capacity for phagocytosis.
{"title":"Neutrophils display antibacterial defense via non-canonical LC3 decoration of extracellular bacteria","authors":"Jurate Skerniskyte , Marina Valente Barroso , Johana Chicher , Philippe Hammann , Valerie Demais , Kathryn Wright , Serge Mostowy , Benoit S. Marteyn","doi":"10.1016/j.micinf.2025.105545","DOIUrl":"10.1016/j.micinf.2025.105545","url":null,"abstract":"<div><div>Neutrophils play a pivotal role in the innate immune response to bacterial infection, being one of the first immune cells to reach infectious sites. Bacterial infection may induce neutrophil degranulation, production of neutrophil extracellular traps (NETs), or pathogen phagocytosis. While LC3 is typically linked to autophagy, here we observed a non-canonical role of LC3 when peripheral neutrophils interact with bacteria both <em>in vivo</em> and <em>in vitro</em>, using <em>Shigella</em> spp. as a model. Upon incubation with neutrophils, extracellular bacteria became labelled by LC3 (LC3+) along with granules-localised antimicrobial components, such as lactotransferrin, defensin, elastase, and myeloperoxidase, as demonstrated by mass spectrometry. Co-localisation of LC3 and plasma membrane-specific dyes indicated that neutrophil plasma membrane-derived elongated structures covering bacteria were responsible for the labelling. This phenomenon was associated with bacterial growth restriction and bacterial cell-death induction. Testing with specific inhibitors demonstrated that this labelling was dependent on functional V-type ATP synthase. Covering bacteria with membrane-derived elongated structures enhanced the subsequent phagocytosis of bacteria by neutrophils. Finally, the LC3 labelling rate increased with higher bacterial burden. In conclusion, we propose that this defense mechanism is beneficial when the burden of bacterial infection overwhelms neutrophils' capacity for phagocytosis.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105545"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144567633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105549
Seto C. Ogunleye, Minna Hassan, Mark L. Lawrence, Hossam Abdelhamed
Listeria monocytogenes, a significant foodborne pathogen, is known for its remarkable adaptability to diverse environments through a genomic regulatory network that coordinates metabolic activities and stress responses. However, many of these genomic elements remain poorly understood. This study investigates the role of deoRF, a previously understudied member of the DeoR-family, in oxidative tolerance, intracellular infection, and virulence. Interestingly, the F2365ΔdeoRF strain showed no significant growth defects in minimal media with glucose, fructose, or sucrose, suggesting that DeoRF does not play a critical role in the uptake or metabolism of these sugars. Results showed that DeoRF plays a significant role in the ability of L. monocytogenes to adapt to oxidative stress. Additionally, DeoRF contributed significantly to cell-to-cell spread in L2 fibroblast cells, intracellular replication in macrophage cells, and virulence in mice following both intravenous and oral infection models. Transcriptomic analysis further revealed that deletion of deoRF caused downregulation of propanediol utilization, transcription regulators, phosphotransferase systems (PTS), complex networks of transcriptional regulators, and proteases genes. Conversely, sigma B regulator genes were upregulated in the ΔdeoRF strain. This study demonstrates that L. monocytogenes DeoRF contributes to pathogenicity and stress adaptation, and it is an important contributor to the complex listerial regulatory network.
{"title":"The impact of DeoRF on Listeria monocytogenes stress tolerance and survival","authors":"Seto C. Ogunleye, Minna Hassan, Mark L. Lawrence, Hossam Abdelhamed","doi":"10.1016/j.micinf.2025.105549","DOIUrl":"10.1016/j.micinf.2025.105549","url":null,"abstract":"<div><div><em>Listeria monocytogenes,</em> a significant foodborne pathogen, is known for its remarkable adaptability to diverse environments through a genomic regulatory network that coordinates metabolic activities and stress responses. However, many of these genomic elements remain poorly understood. This study investigates the role of <em>deoRF</em>, a previously understudied member of the DeoR-family, in oxidative tolerance, intracellular infection, and virulence. Interestingly, the F2365Δ<em>deoRF</em> strain showed no significant growth defects in minimal media with glucose, fructose, or sucrose, suggesting that DeoRF does not play a critical role in the uptake or metabolism of these sugars. Results showed that DeoRF plays a significant role in the ability of <em>L. monocytogenes</em> to adapt to oxidative stress. Additionally, DeoRF contributed significantly to cell-to-cell spread in L2 fibroblast cells, intracellular replication in macrophage cells, and virulence in mice following both intravenous and oral infection models. Transcriptomic analysis further revealed that deletion of <em>deoRF</em> caused downregulation of propanediol utilization, transcription regulators, phosphotransferase systems (PTS), complex networks of transcriptional regulators, and proteases genes. Conversely, sigma B regulator genes were upregulated in the Δ<em>deoRF</em> strain. This study demonstrates that <em>L. monocytogenes</em> DeoRF contributes to pathogenicity and stress adaptation, and it is an important contributor to the complex listerial regulatory network.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105549"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144708126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105531
Marta Gliźniewicz , Barbara Dołęgowska , Adrian Augustyniak , Rafał Rakoczy , Tomasz Kędzierski , Ewa Mijowska , Bartłomiej Grygorcewicz
Polymicrobial biofilms, including inter-kingdom ones, represent another threat in the post-antibiotic era. Therefore, many alternative solutions are being investigated, including phage-antibiotic synergy (PAS), which may be more effective due to the differing mechanisms of action of drugs and phages. In this study, we evaluated how different sequences of administering a bacteriophage cocktail, ciprofloxacin, and caspofungin affect the eradication of S. aureus and C. albicans in vitro (planktonic culture and in biofilms). In liquid culture, the phage → caspofungin → ciprofloxacin treatment completely eradicated both organisms. In biofilms, the most effective regimens were either the simultaneous application of all three agents or phages + ciprofloxacin followed by caspofungin. Therefore, the sequence of administration of drugs and phages is a key factor in achieving effective therapy and revealing the most synergistic combinations.
{"title":"Effects of sequential administration of phage cocktail, ciprofloxacin, and caspofungin on Staphylococcus aureus and Candida albicans dual-species biofilms","authors":"Marta Gliźniewicz , Barbara Dołęgowska , Adrian Augustyniak , Rafał Rakoczy , Tomasz Kędzierski , Ewa Mijowska , Bartłomiej Grygorcewicz","doi":"10.1016/j.micinf.2025.105531","DOIUrl":"10.1016/j.micinf.2025.105531","url":null,"abstract":"<div><div>Polymicrobial biofilms, including inter-kingdom ones, represent another threat in the post-antibiotic era. Therefore, many alternative solutions are being investigated, including phage-antibiotic synergy (PAS), which may be more effective due to the differing mechanisms of action of drugs and phages. In this study, we evaluated how different sequences of administering a bacteriophage cocktail, ciprofloxacin, and caspofungin affect the eradication of <em>S. aureus</em> and <em>C. albicans in vitro</em> (planktonic culture and in biofilms). In liquid culture, the phage → caspofungin → ciprofloxacin treatment completely eradicated both organisms. In biofilms, the most effective regimens were either the simultaneous application of all three agents or phages + ciprofloxacin followed by caspofungin. Therefore, the sequence of administration of drugs and phages is a key factor in achieving effective therapy and revealing the most synergistic combinations.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105531"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144199603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01DOI: 10.1016/j.micinf.2025.105558
María Belén Brunner , Juan José Rosales , Marla Ladera , María Victoria Nieto Farías , Andrea Verna , Sandra Pérez
Varicellovirus bovinealpha (BoAHV) 1 and 5 are alphaherpesviruses that differ in their neuropathogenic potential. While BoAHV-5 causes necrotizing meningoencephalitis in calves, neurological cases associated with BoAHV-1 are less frequent. In this study we used differentiated the human neuroblastoma cell line (SH-SY5Y) to evaluate the mRNA expression of Toll-like receptor 3 (TLR3), its adaptor molecule TRIF and the production of interferons and pro-inflammatory cytokines during infection with both alphaherpesviruses. TLR3 was activated with polyinosinic acid: polycytidylic acid (Poly I:C) and it was genetically silenced using TLR3-targeted siRNA. BoAHV infection induced an initial upregulation of TLR3, followed by a notable decrease, particularly in BoAHV-5-infected cells. TLR3 knockdown was effective for 72 h in uninfected cells although it was reversed shortly after BoAHV infection. In the presence of activated TLR3, virus titers remained high, indicating limited antiviral activity of TLR3 signaling. TRIF was downregulated early after infection, implying viral interference with the innate immune response. In contrast, Poly I:C upregulated TLR3 and TRIF. IFN-β was upregulated following infection and IFN-α/β, TNF-α and IL-6 were induced even in TLR3-silenced cells, implicating the involvement of alternative signaling pathways. These findings demonstrate how bovine alphaherpesviruses modulate the innate immune mechanisms, highlighting differential viral strategies to evade the immune response which may contribute to neuropathogenesis.
{"title":"TLR3 regulation and cytokine response during BoAHV-1 and BoAHV-5 infection of neuronal-like cells","authors":"María Belén Brunner , Juan José Rosales , Marla Ladera , María Victoria Nieto Farías , Andrea Verna , Sandra Pérez","doi":"10.1016/j.micinf.2025.105558","DOIUrl":"10.1016/j.micinf.2025.105558","url":null,"abstract":"<div><div><em>Varicellovirus bovinealpha</em> (BoAHV) 1 and 5 are alphaherpesviruses that differ in their neuropathogenic potential. While BoAHV-5 causes necrotizing meningoencephalitis in calves, neurological cases associated with BoAHV-1 are less frequent. In this study we used differentiated the human neuroblastoma cell line (SH-SY5Y) to evaluate the mRNA expression of Toll-like receptor 3 (TLR3), its adaptor molecule TRIF and the production of interferons and pro-inflammatory cytokines during infection with both alphaherpesviruses. TLR3 was activated with polyinosinic acid: polycytidylic acid (Poly I:C) and it was genetically silenced using TLR3-targeted siRNA. BoAHV infection induced an initial upregulation of TLR3, followed by a notable decrease, particularly in BoAHV-5-infected cells. TLR3 knockdown was effective for 72 h in uninfected cells although it was reversed shortly after BoAHV infection. In the presence of activated TLR3, virus titers remained high, indicating limited antiviral activity of TLR3 signaling. TRIF was downregulated early after infection, implying viral interference with the innate immune response. In contrast, Poly I:C upregulated TLR3 and TRIF. IFN-β was upregulated following infection and IFN-α/β, TNF-α and IL-6 were induced even in TLR3-silenced cells, implicating the involvement of alternative signaling pathways. These findings demonstrate how bovine alphaherpesviruses modulate the innate immune mechanisms, highlighting differential viral strategies to evade the immune response which may contribute to neuropathogenesis.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105558"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Staphylococcus aureus infections remain a great concern in people with cystic fibrosis also after the introduction of modulator therapy. Here we describe the state of the art of traditional and novel therapeutic strategies to fight both acute and chronic infections caused by sensitive and drug resistant strains.
{"title":"Therapeutic strategies to combat Staphylococcus aureus infections in cystic fibrosis","authors":"Aygun Israyilova , Gabriele Trespidi , Viola Camilla Scoffone , Silvia Buroni","doi":"10.1016/j.micinf.2025.105546","DOIUrl":"10.1016/j.micinf.2025.105546","url":null,"abstract":"<div><div><em>Staphylococcus aureus</em> infections remain a great concern in people with cystic fibrosis also after the introduction of modulator therapy. Here we describe the state of the art of traditional and novel therapeutic strategies to fight both acute and chronic infections caused by sensitive and drug resistant strains.</div></div>","PeriodicalId":18497,"journal":{"name":"Microbes and Infection","volume":"27 7","pages":"Article 105546"},"PeriodicalIF":2.7,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144649888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}