Biology subjects

Gewirtz, A. T.

Publications and source records attributed to Gewirtz, A. T..

11 recordsLinked to original sources

bioRxiv2025

Flagellin in the human gut microbiome is a diet-adjustable adjuvant for vaccination

The intestinal microbiota is thought to modulate immune responsiveness to vaccines. Human studies on this topic, however, have yielded inconsistent results1,2. We hypothesized that the microbiome would influence innate immune responses, and thus vaccine reactogenicity, more directly than vaccine immunogenicity. To test this, we established the {micro}HEAT (Microbial-Human Ecology And Temperature) study, which longitudinally profiled the fecal microbiota, oral body temperature and serum antibody responses of 171 healthy adults (18-40 years old) before and after vaccination for SARS-CoV-2. Increased temperature after vaccination ({Delta}T) was associated with habitual diet and with baseline metabolic and immune markers. The microbiomes of {Delta}T-high ({Delta}Thi) participants were characterized by high expression of flagellin and an overabundance of the flagellated bacterium Waltera. Fecal samples from {Delta}Thi participants induced more inflammation in human cells and stronger post-vaccine temperature responses in mice compared to {Delta}Tlo samples, suggesting a causal role for the microbiome. Moreover, Waltera flagellin replicated the inflammatory phenotypes in vitro and was modulable via a dietary additive. Overall, these data suggest that flagellin from the gut microbiome stimulates innate immunity and vaccine reactogenicity, and that this axis can be manipulated via diet. These findings have implications for improving human vaccine tolerance and immunogenicity.

microbiology↗

bioRxiv2025

An animal model of coronary microvascular dysfunction (CMD) in the female spontaneously hypertensive rat: the role of diet

Coronary microvascular dysfunction (CMD) drives angina in patients with ischemia non-obstructive coronary artery disease, a condition that is more prevalent in females. Effective treatment strategies and a detailed mechanistic understanding of CMD remain limited, in part, due to scarcity of physiologically relevant animal models. Indeed, while CMD has been studied in animals with diabetes and/or fed high-fat diets, in fact, hypertension is the predominant risk factor for CMD in humans but is not captured by these models. Thus, we characterized the CMD that arose in female spontaneously hypertensive rats (SHRs). We measured coronary flow reserve, alongside basic cardiovascular function in SHRs and normotensive Wistar Kyoto rats (WKYs) fed a purified diet, as well as SHRs consuming a grain-based chow (GBC) diet. SHRs on a purified diet, but not WKYs or SHRs consuming GBC, exhibited impaired coronary flow reserve as assessed by echocardiography. Thus, SHRs develop a diet-dependent CMD, which can serve as a model to study hypertension-related CMD. Graphical Abstract O_FIG O_LINKSMALLFIG WIDTH=103 HEIGHT=200 SRC="FIGDIR/small/632950v1_ufig1.gif" ALT="Figure 1"> View larger version (21K): org.highwire.dtl.DTLVardef@678703org.highwire.dtl.DTLVardef@d10660org.highwire.dtl.DTLVardef@f9b941org.highwire.dtl.DTLVardef@f1924b_HPS_FORMAT_FIGEXP M_FIG C_FIG

physiology↗

bioRxiv2024

Efficacy of late-onset antiviral treatment in immune-compromised hosts with persistent SARS-CoV-2 infection

The immunocompromised are at high risk of prolonged SARS-CoV-2 infection and progression to severe COVID-19. However, efficacy of late-onset direct-acting antiviral (DAA) therapy with therapeutics in clinical use and experimental drugs to mitigate persistent viral replication is unclear. In this study, we employed an immunocompromised mouse model, which supports prolonged replication of SARS-CoV-2 to explore late-onset treatment options. Tandem immuno-depletion of CD4+ and CD8+ T cells in C57BL/6 mice followed by infection with SARS-CoV-2 variant of concern (VOC) beta B.1.351 resulted in prolonged infection with virus replication for five weeks after inoculation. Early-onset treatment with nirmatrelvir/ritonavir (paxlovid) or molnupiravir was only moderately efficacious, whereas the experimental therapeutic 4-fluorourdine (4-FlU, EIDD-2749) significantly reduced virus load in upper and lower respiratory compartments four days post infection (dpi). All antivirals significantly lowered virus burden in a 7-day treatment regimen initiated 14 dpi, but paxlovid-treated animals experienced rebound virus replication in the upper respiratory tract seven days after treatment end. Viral RNA was detectable 28 dpi in paxlovid-treated animals, albeit not in the molnupiravir or 4-FlU groups, when treatment was initiated 14 dpi and continued for 14 days. Low-level virus replication continued 35 dpi in animals receiving vehicle but had ceased in all treatment groups. These data indicate that late-onset DAA therapy significantly shortens the duration of persistent virus replication in an immunocompromised host, which may have implications for clinical use of antiviral therapeutics to alleviate the risk of progression to severe disease in highly vulnerable patients. ImportanceFour years after the onset of the global COVID-19 pandemic, the immunocompromised are at greatest risk of developing life-threatening severe disease. However, specific treatment plans for this most vulnerable patient group have not yet been developed. Employing a CD4+ and CD8+ T cell-depleted immunocompromised mouse model of SARS-CoV-2 infection, we explored therapeutic options of persistent infections with standard-of-care paxlovid, molnupiravir, and the experimental therapeutic 4-FlU. Late-onset treatment initiated 14 days after infection was efficacious, but only 4-FlU was rapidly sterilizing. No treatment-experienced viral variants with reduced susceptibility to the drugs emerged, albeit virus replication rebounded in animals of the paxlovid group after treatment end. This study supports the use of direct-acting antivirals for late-onset management of persistent SARS-CoV-2 infection in immunocompromised hosts. However, treatment courses likely require to be extended for maximal therapeutic benefit, calling for appropriately powered clinical trials to meet the specific needs of this patient group.

microbiology↗

bioRxiv2023

Intestinal microbiota programming of alveolar macrophages influences severity of respiratory viral infection

Susceptibility to respiratory virus infections (RVIs) varies widely across individuals. Because the gut microbiome impacts immune function, we investigated the influence of intestinal microbiota composition on RVI and determined that segmented filamentous bacteria (SFB), naturally acquired or exogenously administered, protected mice against influenza virus (IAV) infection. Such protection, which also applied to respiratory syncytial virus and SARS-CoV-2, was independent of interferon and adaptive immunity but required basally resident alveolar macrophages (AM). In SFB-negative mice, AM were quickly depleted as RVI progressed. In contrast, AM from SFB-colonized mice were intrinsically altered to resist IAV-induced depletion and inflammatory signaling. Yet, AM from SFB-colonized mice were not quiescent. Rather, they directly disabled IAV via enhanced complement production and phagocytosis. Accordingly, transfer of SFB-transformed AM into SFB-free hosts recapitulated SFB-mediated protection against IAV. These findings uncover complex interactions that mechanistically link the intestinal microbiota with AM functionality and RVI severity. One sentence summaryIntestinal segmented filamentous bacteria reprogram alveolar macrophages promoting nonphlogistic defense against respiratory viruses.

immunology↗

bioRxiv2022

PSYLLIUM FIBER PROTECTS MICE AGAINST WESTERN DIET-INDUCED METABOLIC SYNDROME VIA MICROBIOTA-DEPENDENT MECHANISM

We sought to identify semi-purified fibers that broadly promote gut and metabolic health and, moreover, identify the mechanisms by which they do so. Screening an array of purified fibers led us o appreciate that, of all fibers tested, psyllium was unique in that it strongly protected mice against both colitis and metabolic syndrome. Further investigation led us to appreciate that psylliums mechanism of action is quite distinct. Specifically, data we report in a manuscript under review indicates that low doses of psyllium protect mice against colitis via increasing serum bile acids that activate FXR. Here, we report that higher doses of psyllium protect mice against diet-induced obesity/metabolic syndrome by a FXR-independent mechanism that requires presence of at least a minimal microbiota.

microbiology↗

bioRxiv2022

Silent recognition of flagellins from human gut commensal bacteria by Toll-like receptor 5

Flagellin, the protein unit of the bacterial flagellum, stimulates the innate immune receptor Toll-like receptor (TLR)5 following pattern recognition, or evades TLR5 through lack of recognition. This binary response fails to explain the weak agonism of flagellins from commensal bacteria, raising the question of how TLR5 response is tuned. Here, we describe a novel class of flagellin-TLR5 interaction, termed silent recognition. Silent flagellins are weak agonists despite high affinity binding to TLR5. This dynamic response is tuned by TLR5-flagellin interaction distal to the site of pattern recognition. Silent flagellins are produced primarily by the abundant gut bacteria Lachnospiraceae and are enriched in non-Western populations. These findings provide a mechanism for the innate immune system to tolerate commensal-derived flagellins. One-Sentence SummaryTLR5 sensitively recognizes, but responds weakly to, flagellins from gut commensal bacteria.

microbiology↗

bioRxiv2020

Methyltransferase SMYD5 Exaggerates IBD by Downregulating Mitochondrial Functions via Post-translational Control of PGC-1α Stability

Background and AimsThe expression and role of methyltransferase SET and MYND domain-containing protein 5 (SMYD5) in inflammatory bowel diseases (IBD) is completely unknown. Here, we investigated the role and the underlying mechanism of epithelial SMYD5 in IBD pathogenesis and progression. MethodsThe expression and subcellular localization of SMYD5 and peroxisome proliferator-activated receptor gamma coactivator-1 (PGC-1) were examined by Western blot analysis, immunofluorescence staining, and immunohistochemistry in intestinal epithelial cells (IECs) and in colon tissues from human IBD patients and mice with experimental colitis. Mice with Smyd5 conditional knockout in IECs and littermate controls were subjected to DSS-induced experimental colitis and the disease severity and inflammation were assessed. SMYD5-regulated mitochondrial biogenesis was examined by RT-qPCR and transmission electron microscopy and mitochondrial oxygen consumption rate was measured in a Seahorse Analyzer system. The interaction between SMYD5 and PGC-1 was determined by co-immunoprecipitation assay. PGC-1 degradation and turnover (half-life) were analyzed by cycloheximide chase assay. SMYD5-mediated PGC-1 methylation was measured via in vitro methylation followed by mass spectrometry to identify the specific lysine residues that were methylated. ResultsUp-regulated SMYD5 and down-regulated PGC-1 were observed in IECs from IBD patients and mice with experimental colitis. However, Smyd5 depletion in IECs protected mice from DSS-induced colitis. SMYD5 was critically involved in regulating mitochondrial biology such as mitochondrial biogenesis, respiration, and apoptosis. Mechanistically, SMYD5 regulated mitochondrial functions in a PGC-1 dependent manner. Further, SMYD5 mediated lysine methylation of PGC-1 and facilitated its ubiquitination and proteasomal degradation. ConclusionSMYD5 attenuates mitochondrial functions in IECs and promotes IBD progression by enhancing the proteasome-mediated degradation of PGC-1 protein in methylation-dependent manner. Strategies to decrease SMYD5 expression and/or increase PGC-1 expression in IECs might be a promising therapeutic approach to treat patients with IBD.

cell biology↗

bioRxiv2020

Western-style diet impedes colonization and clearance of gut bacterial pathogens

BackgroundWestern-style diet (WSD), which is high in fat and low in fiber, lacks nutrients to support gut microbiota. Consequently, WSD promotes microbiota encroachment and reduces microbiota density, potentially influencing colonization resistance, immune system readiness, and, consequently host defense against pathogenic bacteria. Additionally, the low-nutrient colonic environment resulting from WSD might impact bacterial pathogens. AimsExamine impact of WSD on infection and colitis in response to gut bacterial pathogens. MethodsMice fed grain-based chow (GBC), WSD, or various versions thereof, were orally infected with Citrobacter rodentium or C. difficile. Colonization and its consequences, including inflammation and death were monitored. ResultsWSD delayed Citrobacter growth, reduced its virulence gene expression and ameliorated inflammation. However, while GBC-fed mice uniformly cleared Citrobacter and were impervious to subsequent Citrobacter challenges, most WSD-fed mice remained chronically infected with Citrobacter while those that cleared it were highly prone to re-infection. Such persistent proneness to Citrobacter infection did not reflect reduced immune responsiveness but rather reflected reduced colonization resistance likely from the low microbiota density resulting from WSD feeding. While persistent Citrobacter infection did not cause overt inflammation, it was associated with low-grade inflammation in colon and adipose tissue that was associated with insulin resistance. An analogous pattern was seen in response to C. difficile with WSD resulting in delayed colonization and mortality while enriching WSD with fiber hastened colonization but afforded clearance and survival. Altering microbiota via diet can profoundly impact the course and consequence of infection following exposure to gut bacterial pathogens. SynopsisDietary fiber results in a nutrient rich colon that is exploited by gut pathogens including C. rodentium and C. difficile, that rapidly colonize the colon. Hight-fat, low-fiber western-style diet results in a low-density gut microbiota unable to mediate clearance of pathogens from the colon. Inability to clear pathogens from the gut lumen promotes chronic low-grade inflammation and insulin resistance. Graphic summaryThe low-fiber content of WSD impedes initial colonization of pathogens. Immune system functions appropriately irrespective of diet to clear pathogens from the mucosa. Commensal microbiota of mice fed GBC but not WSD is sufficient to eliminate pathogen from the lumen of the intestine. Underlying mechanisms discussed in text. O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=72 SRC="FIGDIR/small/329144v1_ufig1.gif" ALT="Figure 1"> View larger version (28K): org.highwire.dtl.DTLVardef@111fa1org.highwire.dtl.DTLVardef@33a904org.highwire.dtl.DTLVardef@19d5b41org.highwire.dtl.DTLVardef@1d21bb1_HPS_FORMAT_FIGEXP M_FIG C_FIG

microbiology↗

bioRxiv2019

Specific targeting of intestinal Prevotella copri by a Listeria monocytogenes bacteriocin

Deciphering the specific function of every microorganism in microbial gut communities is a key issue to interrogate their role during infection. Here, we report the discovery of a Listeria bacteriocin, Lmo2776, that specifically targets the abundant gut commensal Prevotella copri and affects Listeria infection. Oral infection of conventional mice with a {Delta}lmo2776 mutant leads to a thinner intestinal mucus layer and higher Listeria loads both in the intestinal content and deeper tissues compared to WT Listeria, while no difference is observed in germ-free mice. This microbiota-dependent effect is phenocopied by precolonization of germ-free mice before Listeria infection, with P. copri, but not with other commensals. Together, these data unveil a role for Prevotella in controlling intestinal infection, highlighting that pathogens may selectively deplete microbiota to avoid excessive inflammation.

microbiology↗

bioRxiv2019

Sphingolipid production by gut Bacteroidetes regulates glucose homeostasis

Levels of Bacteroidetes in the gut microbiome are positively associated with insulin resistance (IR) in humans. Considering that IR is promoted by elevations in hepatic sphingolipids (SL), particularly ceramides, and that Bacteroidetes are the only microbiome phylum possessing genes encoding serine palmitoyltransferase (SPT), which mediates SL synthesis, we investigated a potential link between bacterial SL production, host SL metabolism, and IR. In vitro, bacterial SLs entered colonocytes and were metabolized into complex SL, including ceramides. In mice, administration of WT Bacteroides thetaiotaomicron, but not a SPT-deficient mutant, resulted in elevated levels of liver ceramides and reduced responsiveness to exogenously administered insulin. This work establishes bacterial SLs as a new class of microbiome-derived molecule capable of impacting host metabolism.\n\nOne Sentence SummarySL production by gut Bacteroidetes regulates liver ceramide levels and insulin sensitivity.

microbiology↗

bioRxiv2019

Gut microbiota influence B cell function in a TLR5-dependent manner

Toll-like receptor (TLR) 5-deficient mice display aberrantly low levels of flagellin-specific antibodies (Flic-IgA) secreted into the gut, combined with excess bacterial flagellin in the gut, and together these attributes define microbiome dysbiosis (T5-dysbiosis). How TLR5 signaling deficiency results in T5-dysbiosis is unclear. Here, we address the role of B cells in T-dysbiosis. We observed that B cells do not express TLR5, and that B cell transplantation from TLR5-/- mouse donors into B-cell deficient mice resulted in a slight reduction in Flic-IgA levels compared to B-cells from WT donors. Bone marrow transplants from WT and TLR5-/- donors into recipients of both genotypes confirmed that TLR5 signaling by non-hematopoietic cells is required for T5-dysbiosis. We observed TLR5 deficiency was associated with an expanded population of IgA+ B cells. TLR5-/- mice tended to have higher richness for the IgA gene hypervariable region (CDR3 gene) variants. Transplantation of microbiomes from TLR5-/- and WT microbiomes donors into germfree mice resulted in a higher proportion of IgA-secreting B cells, and higher overall fecal IgA and anti-Flic IgA for TLR5-/- microbiome recipients. This observation indicated that the TLR5-/- mouse microbiome elicits an anti-flagellin antibody response that requires TLR5 signaling. Together these results indicate that TLR5 signaling on epithelial cells influences B cell populations and antibody repertoire.

immunology↗