Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Microbiology

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 121 - 150 of 2229

Full-Text Articles in Entire DC Network

Internship As An In-Vivo Technician At The Institute For Antiviral Research, Ashlynn Clark Apr 2025

Internship As An In-Vivo Technician At The Institute For Antiviral Research, Ashlynn Clark

Student Research Symposium

The Institute for Antiviral Research (IAR), located at Utah State University, specializes in evaluating antiviral agents and vaccines against a wide array of human pathogenic viruses, such as influenza, enterovirus, West Nile virus, yellow fever, zika virus, polio, and SARS-CoV-2, utilizing in vivo and in vitro models.


Clinical Characteristics And Outcomes Of Pediatric Staphylococcal Scalded Skin Syndrome (Ssss) At An Inner-City Tertiary Care Center, Nina Kb Gust Md, Ashley Frei Bs, Rebecca M. Adams Bs, Elika Ridelman Phd, Christina Shanti Md, Ronald Thomas Phd, Jocelyn Y. Ang Md Apr 2025

Clinical Characteristics And Outcomes Of Pediatric Staphylococcal Scalded Skin Syndrome (Ssss) At An Inner-City Tertiary Care Center, Nina Kb Gust Md, Ashley Frei Bs, Rebecca M. Adams Bs, Elika Ridelman Phd, Christina Shanti Md, Ronald Thomas Phd, Jocelyn Y. Ang Md

Medical Student Research Symposium

Introduction

Staphylococcal Scalded Skin Syndrome (SSSS) is a blistering skin condition caused by a toxin-producing staphylococcus species. Epidemiologic studies on pediatric SSSS in the United States are limited, with a reported incidence of 7.67 cases per million children and 45.1 per million infants. Immature renal function, lack of protective antibodies, and increased exotoxin target desmoglein-1 are hypothesized to increase incidence in younger children. We aimed to determine clinical and microbiological characteristics of pediatric SSSS and factors that could help predict disease severity.

Methods

A retrospective chart review was performed for admitted patients under 18 years old diagnosed with SSSS from …


Neutrophil Inflammatory Death Regulation By Bacterial Type Iii Secreted Effectors, Arianna D. Reuven Apr 2025

Neutrophil Inflammatory Death Regulation By Bacterial Type Iii Secreted Effectors, Arianna D. Reuven

Dartmouth College Ph.D Dissertations

Yersinia and Pseudomonas use a T3SS to secrete effectors into host cells that inhibit phagocytosis and modulate immune responses, such as inflammasome activation. Inflammasomes promote the activation of the proinflammatory protease caspase-1. The activation of an inflammasome sensor in response to a signal or ligand initiates the assembly of the inflammasome leading to activation of caspase-1 which cleaves GSDMD and pro-inflammatory cytokines IL-1β and IL-18 into their mature forms. As neutrophils are recruited in large quantities to sites of infection, they are excellent candidates to drive inflammasome dependent responses. Neutrophils have been shown to produce multiple inflammasomes, like pyrin and …


Eating The Fat Of The Land: The Work Of Coxiella Burnetii To Traverse Intracellular Lipid Landscapes, Charlie Porto Apr 2025

Eating The Fat Of The Land: The Work Of Coxiella Burnetii To Traverse Intracellular Lipid Landscapes, Charlie Porto

Theses & Dissertations

Coxiella burnetii is an obligate intracellular pathogen and the causative agent of Q fever in humans. With primary hosts in livestock ruminants, C. burnetii is endemic globally, presenting significant health risks to agricultural workers and herd health at large. Numerous wild animal reservoirs exist, increasingly threatened by expanding livestock ranges. Furthermore, with a low infectious dose through aerosol transmission, the CDC considers C. burnetii a potential bioweapon, though in humans a large amount of infections persist subclinically, occasionally progressing to pneumonia and hepatitis with chronic infections leading to endocarditis.

The parasitic life cycle of C. burnetii is biphasic, a small …


Limosilactobacillus Reuteri Promotes The Expression And Secretion Of Enteroendocrine- And Enterocyte-Derived Hormones, Sara C Di Rienzi, Heather A Danhof, Micah D Forshee, Ari Roberts, Robert A Britton Mar 2025

Limosilactobacillus Reuteri Promotes The Expression And Secretion Of Enteroendocrine- And Enterocyte-Derived Hormones, Sara C Di Rienzi, Heather A Danhof, Micah D Forshee, Ari Roberts, Robert A Britton

Faculty, Staff and Students Publications

Intestinal microbes can beneficially impact host physiology, prompting investigations into the therapeutic usage of such microbes in a range of diseases. For example, human intestinal microbe Limosilactobacillus reuteri strains ATCC PTA 6475 and DSM 17938 are being considered for use for intestinal ailments, including colic, infection, and inflammation, as well as for non-intestinal ailments, including osteoporosis, wound healing, and autism spectrum disorder. While many of their beneficial properties are attributed to suppressing inflammatory responses, we postulated that L. reuteri may also regulate intestinal hormones to affect physiology within and outside of the gut. To determine if L. reuteri secreted factors …


Investigating The Proviral And Immunogenic Effects Of Sars-Cov-2 Accessory Protein 7a, Grant Michael Hawkins Mar 2025

Investigating The Proviral And Immunogenic Effects Of Sars-Cov-2 Accessory Protein 7a, Grant Michael Hawkins

Dissertations

SARS-CoV-2 and related sarbecoviruses encode a set of accessory proteins (3a, 3b, 6, 7a, 7b, 8, 9b, and 10) that control host responses to infection and promote virus growth. Of these accessory proteins, 7a is set apart by its intracellular localization near coronavirus (CoV) budding sites and its incorporation into secreted virions. Initial studies utilizing a virus-like particle (VLP) system identified significant proviral effects mediated by 7a, but the system lacked the context of an actual CoV infection. To investigate 7a functions during CoV infections, we constructed recombinant Mouse Hepatitis Viruses (rMHV strain A59) that express 7a genes. Comparative infections …


The Design, Construction, And Testing Of Mrna Vaccine Against Equine Herpes Virus, Bhawana Devkota Mar 2025

The Design, Construction, And Testing Of Mrna Vaccine Against Equine Herpes Virus, Bhawana Devkota

LSU Master's Theses

Equine Herpesvirus-1 (EHV 1) is a worldwide significant pathogen that causes respiratory illness, abortion, and neurological disorders in equine. Current vaccines, including live attenuated, inactivated, and subunit platforms, do not prevent viral latency, mucosal shedding, or cross-strain immunity, requiring alternative approaches. To address these gaps, this project explores the design, synthesis, and in vitro testing of an mRNA vaccine targeting immunogenic EHV 1 glycoprotein (gB, gC, gD, gG, and gM). Epitopes were computationally predicted using the Immune Epitope Database (IEDB), codon-optimized for Bos taurus, and cloned into pUCIDT vectors using SP6/T7 promoters. In vitro transcription (IVT) used nucleotide modifications …


The Autophagy Protein Atg14 Safeguards Against Unscheduled Pyroptosis Activation To Enable Embryo Transport During Early Pregnancy, Pooja Popli, Arin K Oestreich, Vineet K Maurya, Marina N Rowen, Yong Zhang, Michael J Holtzman, Ramya Masand, John P Lydon, Shizuo Akira, Kelle Moley, Ramakrishna Kommagani Mar 2025

The Autophagy Protein Atg14 Safeguards Against Unscheduled Pyroptosis Activation To Enable Embryo Transport During Early Pregnancy, Pooja Popli, Arin K Oestreich, Vineet K Maurya, Marina N Rowen, Yong Zhang, Michael J Holtzman, Ramya Masand, John P Lydon, Shizuo Akira, Kelle Moley, Ramakrishna Kommagani

Faculty, Staff and Students Publications

Recurrent pregnancy loss, characterized by two or more failed clinical pregnancies, poses a significant challenge to reproductive health. In addition to embryo quality and endometrial function, proper oviduct function is also essential for successful pregnancy establishment. Therefore, structural abnormalities or inflammation resulting from infection in the oviduct may impede the transport of embryos to the endometrium, thereby increasing the risk of miscarriage. However, our understanding of the biological processes that preserve the oviductal cellular structure and functional integrity is limited. Here, we report that autophagy-related protein ATG14 plays a crucial role in maintaining the cellular integrity of the oviduct by …


Emerging Clostridioides Difficile Ribotypes Have Divergent Metabolic Phenotypes, Firas S Midani, Heather A Danhof, Nathanael Mathew, Colleen K Ardis, Kevin W Garey, Jennifer K Spinler, Robert A Britton Mar 2025

Emerging Clostridioides Difficile Ribotypes Have Divergent Metabolic Phenotypes, Firas S Midani, Heather A Danhof, Nathanael Mathew, Colleen K Ardis, Kevin W Garey, Jennifer K Spinler, Robert A Britton

Faculty, Staff and Students Publications

Clostridioides difficile is a gram-positive spore-forming pathogen that commonly causes diarrheal infections in the developed world. Although C. difficile is a genetically diverse species, certain ribotypes are overrepresented in human infections, and it is unclear if metabolic adaptations are essential for the emergence of these epidemic ribotypes. To identify ribotype-specific metabolic differences, we therefore tested carbon substrate utilization by 88 C. difficile isolates and looked for differences in growth between 22 ribotypes. As expected, C. difficile was capable of growing on a variety of carbon substrates. Further, C. difficile strains clustered by phylogenetic relationship and displayed ribotype-specific and clade-specific …


Confounding Factors Of Cervical Carcinogenesis And Cervical Cancer Health Disparity, Vivek Kumar Kashyap, Namita Sinha, Nadeem Zafar, Murali M. Yallapu, Santosh Kumar, Everardo Cobos, Subhash C. Chauhan Mar 2025

Confounding Factors Of Cervical Carcinogenesis And Cervical Cancer Health Disparity, Vivek Kumar Kashyap, Namita Sinha, Nadeem Zafar, Murali M. Yallapu, Santosh Kumar, Everardo Cobos, Subhash C. Chauhan

Research Symposium

Clinical studies show that cervical cancer is the most frequently detected cancer in women living with human immunodeficiency virus (HIV), which has been defined as an acquired immunodeficiency syndrome (AIDS). Women living with HIV are 6 times more likely to develop cervical cancer compared to the general population, and an estimated 5% of all cervical cancer cases are attributable to HIV. Studies suggest that several genes are involved in different molecular pathways, which can influence the vulnerability, severity, or advancement of cervical cancer in the presence of HIV and human papillomavirus (HPV) co-infection. Clinical studies have also shown levels of …


Development Of A Multi-Epitope Peptide Vaccine Against Monkeypox Virus: Immunoinformatics Analysis For South East Asian Hla Alleles, Nelson Chandra, Mochammad Aqilah Herdiansyah, Viol Dhea Kharisma, Arif Nur Muhammad Ansori, Arli Aditya Parikesit Mar 2025

Development Of A Multi-Epitope Peptide Vaccine Against Monkeypox Virus: Immunoinformatics Analysis For South East Asian Hla Alleles, Nelson Chandra, Mochammad Aqilah Herdiansyah, Viol Dhea Kharisma, Arif Nur Muhammad Ansori, Arli Aditya Parikesit

Makara Journal of Science

The monkeypox virus (MPXV), a DNA virus causing zoonotic disease, poses major global public health challenges, with mortality rates between 3%–6%. Although smallpox vaccines provide partial cross-protection, there is a critical need for a dedicated, effective monkeypox (mpox) vaccine. This study aimed to design a multi-epitope peptide-based vaccine specifically adapted to the HLA allele profiles common in Southeast Asian populations, where MPXV cases are rising. Using immunoinformatics, we screened for and detected B and T cell epitopes from the MPXV cell surface antigen and IFN-alpha/beta receptor proteins. The vaccine design was validated through a rigorous evaluation of its antigenicity, immunogenicity, …


Antibacterial Activity Of Endophytic Actinobacteria Isolated From Ziziphus Mauritiana Against Multidrug-Resistant Strains, Hafifatunil Khairani, Jepri Agung Priyanto, Muhammad Eka Prastya, Dwi Retnowati Mar 2025

Antibacterial Activity Of Endophytic Actinobacteria Isolated From Ziziphus Mauritiana Against Multidrug-Resistant Strains, Hafifatunil Khairani, Jepri Agung Priyanto, Muhammad Eka Prastya, Dwi Retnowati

Makara Journal of Science

Increasing resistance to existing antibiotics has led to a need for new alternative sources. Among the possibilities that need to be explored is the endophytic actinobacteria associated with Ziziphus mauritiana. The present study aimed to evaluate the antibacterial activity of endophytic actinobacteria isolated from Z. mauritiana against five multidrug-resistant bacterial strains. Thirty actinobacteria isolates were obtained from the roots, stem, and leaves of the plant using the serial dilution technique. Using a double-layer agar test, we found that colonies from five of the 30 isolates (16%) exhibited antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA) and the M18 strain of Bacillus …


Cardiometabolic Benefits Of A Non-Industrialized-Type Diet Are Linked To Gut Microbiome Modulation, Fuyong Li, Anissa M. Armet, Katri Korpela, Junhong Liu, Rodrigo Margain Quevedo, Francesco Asnicar, Benjamin Seethaler, Tianna B. S. Rusnak, Janis L. Cole, Zhihong Zhang, Shuang Zhao, Adele Gagnon, Edward C. Deehan, Joao F. Mota, Jeffrey A. Bakal, Russell Greiner, Dan Knights, Nicola Segata, Stephan C. Bischoff, Laurie Mereu, Andrea M. Haqq, Catherine J. Field, Liang Li, Carla M. Prado, Jens Walter Mar 2025

Cardiometabolic Benefits Of A Non-Industrialized-Type Diet Are Linked To Gut Microbiome Modulation, Fuyong Li, Anissa M. Armet, Katri Korpela, Junhong Liu, Rodrigo Margain Quevedo, Francesco Asnicar, Benjamin Seethaler, Tianna B. S. Rusnak, Janis L. Cole, Zhihong Zhang, Shuang Zhao, Adele Gagnon, Edward C. Deehan, Joao F. Mota, Jeffrey A. Bakal, Russell Greiner, Dan Knights, Nicola Segata, Stephan C. Bischoff, Laurie Mereu, Andrea M. Haqq, Catherine J. Field, Liang Li, Carla M. Prado, Jens Walter

Department of Food Science and Technology: Faculty Publications

Industrialization adversely affects the gut microbiome and predisposes individuals to chronic non-communicable diseases. We tested a microbiome restoration strategy comprising a diet that recapitulated key characteristics of non-industrialized dietary patterns (restore diet) and a bacterium rarely found in industrialized microbiomes (Limosilactobacillus reuteri) in a randomized controlled feeding trial in healthy Canadian adults. The restore diet, despite reducing gut microbiome diversity, enhanced the persistence of L. reuteri strain from rural Papua New Guinea (PB-W1) and redressed several microbiome features altered by industrialization. The diet also beneficially altered microbiota-derived plasma metabolites implicated in the etiology of chronic non-communicable diseases. Considerable …


Exploring Oxylipins In Host–Microbe Interactions And Their Impact On Infection And Immunity, Robert J. Neff, Christopher D. Radka Mar 2025

Exploring Oxylipins In Host–Microbe Interactions And Their Impact On Infection And Immunity, Robert J. Neff, Christopher D. Radka

Markey Cancer Center Faculty Publications

Plasma lipids are essential components of biological systems, transported through interactions with proteins to maintain cellular functions. These lipids exist in various forms, such as fatty acids, glycerolipids, glycerophospholipids, sphingolipids, sterols, and prenol lipids, derived from dietary intake, adipose tissue, and biosynthesis. While the association between certain fatty acids and cardiovascular diseases has been widely recognized, polyunsaturated fatty acids (PUFAs) exhibit cardioprotective effects, reducing risks of arrhythmias and heart-related mortality. This is due to their role in the production of eicosanoids, which modulate inflammation. Chronic inflammation, particularly in obesity, is significantly influenced by fatty acids, with saturated fatty acids promoting …


Thermophilic Microbiota Of Fifth Water Hot Springs: A Genomic Perspective, Ethan Powers, Zack Galbraith, Trever Thurgood Feb 2025

Thermophilic Microbiota Of Fifth Water Hot Springs: A Genomic Perspective, Ethan Powers, Zack Galbraith, Trever Thurgood

Annual Research Symposium

Geothermal hot springs provide unique microbial habitats characterized by extreme temperatures, variable pH, and diverse geochemical conditions. This study investigates the microbial diversity of three hot spring locations in Diamond Fork Canyon, Utah—Diamond Fork Warm Springs, Fifth Water Hot Springs, and Monk’s Hollow Trailhead—using Oxford Nanopore MinION sequencing of the 16S rRNA gene. Samples were collected in triplicate and analyzed to identify the bacterial composition, with a focus on potential opportunistic pathogens. Our results revealed a diverse microbial community, including members of Pseudomonas, Comamonas, Helicobacter, and Flavobacterium, some of which are known for biofilm formation, antibiotic …


Axl Signaling In Cancer: From Molecular Insights To Targeted Therapies, Monika Yadav, Akansha Sharma, Ketki Patne, Saba Tabasum, Jyoti Suryavanshi, Laxminarayan Rawat, Marc Machaalani, Marc Eid, Rana Singh, Toni Choueiri, Soumitro Pal, Akash Sabarwal Feb 2025

Axl Signaling In Cancer: From Molecular Insights To Targeted Therapies, Monika Yadav, Akansha Sharma, Ketki Patne, Saba Tabasum, Jyoti Suryavanshi, Laxminarayan Rawat, Marc Machaalani, Marc Eid, Rana Singh, Toni Choueiri, Soumitro Pal, Akash Sabarwal

Department of Microbiology and Immunology Faculty Papers

AXL, a member of the TAM receptor family, has emerged as a potential target for advanced-stage human malignancies. It is frequently overexpressed in different cancers and plays a significant role in various tumor-promoting pathways, including cancer cell proliferation, invasion, metastasis, epithelial-mesenchymal transition (EMT), angiogenesis, stemness, DNA damage response, acquired therapeutic resistance, immunosuppression, and inflammatory responses. Beyond oncology, AXL also facilitates viral infections, including SARS-CoV-2 and Zika highlighting its importance in both cancer and virology. In preclinical models, small-molecule kinase inhibitors targeting AXL have shown promising anti-tumorigenic potential. This review primarily focuses on the induction, regulation and biological functions of AXL …


The Role Of Biofilm Matrix On The Growth, Survival, And Diagnosis In Enterobacteriaceae, Kavi Bharathi R Jan 2025

The Role Of Biofilm Matrix On The Growth, Survival, And Diagnosis In Enterobacteriaceae, Kavi Bharathi R

Theses and Dissertations

Bacteria in nature live together encased in a matrix creating community ecosystems called biofilms, this structured space protects them from hostile environments. This study aimed to understand the role of the biofilm matrix in the growth and survival of Enterobacteriaceae. Our hypothesis proposes that subgroups of individuals within a biofilm can specialize in the production of different matrix components.

Matrix expression is metabolically costly, despite its unicellular simplicity, microbes can coordinate complex behaviour like sharing of matrix between producers and non-producers as an adept evolutionary strategy. Their resilience to stress during biofilm formation was studied to assess their abilities to …


Immuno-Bioinformatics Study Of Secondary Metabolites From Watercress Nasturtium Officinale As Immunostimulant In Whiteleg Shrimp Litopenaeus Vannamei By Targeting Peroxinectin And Scavenger Receptor Class B, Qurrota A’Yunin, Muhaimin Rifa’I, Maftuch Maftuch, Yoga Dwi Jatmiko, Muhammad Hermawan Widyananda, Triyanto Triyanto, Muhammad Tegar Handrianto Jan 2025

Immuno-Bioinformatics Study Of Secondary Metabolites From Watercress Nasturtium Officinale As Immunostimulant In Whiteleg Shrimp Litopenaeus Vannamei By Targeting Peroxinectin And Scavenger Receptor Class B, Qurrota A’Yunin, Muhaimin Rifa’I, Maftuch Maftuch, Yoga Dwi Jatmiko, Muhammad Hermawan Widyananda, Triyanto Triyanto, Muhammad Tegar Handrianto

Karbala International Journal of Modern Science

The viral disease affects the whiteleg shrimp (Litopenaeus vannamei) and causes losses. Immunostimulants are recognized as a more environmentally friendly approach to disease management and antimicrobial properties of aquatic organisms. Watercress (Nasturtium officinale) is an aquatic plant species that contains antioxidant properties that can protect the organism from disease and boost the immune system. Shrimp rely heavily on innate immunity to combat infectious agents due to their absence of adaptive immunity. Peroxinectin and scavenger receptor class B (SRB) play essential roles in the shrimp defense system. This research employs a bioinformatic to assess the immunostimulatory potential …


Review Of New Treatment Options For Toxoplasmosis, Kiley Roman Jan 2025

Review Of New Treatment Options For Toxoplasmosis, Kiley Roman

D.U.Quark

Toxoplasmosis is an infectious disease caused by the parasite, Toxoplasma Gondii. The parasite is often carried in cats and contaminated food and water. Toxoplasmosis is not serious most of the time but can be harmful to immunocompromised people, pregnant women, and their fetuses or babies. Treatments are commonly given to the immunocompromised. However, there are problems with the current treatments, in which they only treat active parasites and cannot remove the cysts created by disease progression. Due to the treatments’ inability to remove cysts, an infected person may not fully recover from the infection. This review evaluated the new …


Geographic Disparities Impacting Oral Vaccine Performance: Observations And Future Directions, Rachel M Burke, Sasirekha Ramani, Julia Lynch, Laura V Cooper, Haeun Cho, Ananda S Bandyopadhyay, Carl D Kirkwood, A Duncan Steele, Gagandeep Kang Jan 2025

Geographic Disparities Impacting Oral Vaccine Performance: Observations And Future Directions, Rachel M Burke, Sasirekha Ramani, Julia Lynch, Laura V Cooper, Haeun Cho, Ananda S Bandyopadhyay, Carl D Kirkwood, A Duncan Steele, Gagandeep Kang

Faculty, Staff and Students Publications

Oral vaccines have several advantages compared with parenteral administration: they can be relatively cheap to produce in high quantities, easier to administer, and induce intestinal mucosal immunity that can protect against infection. These characteristics have led to successful use of oral vaccines against rotavirus, polio, and cholera. Unfortunately, oral vaccines for all three diseases have demonstrated lower performance in the highest-burden settings where they are most needed. Rotavirus vaccines are estimated to have >85% effectiveness against hospitalization in children < 12 months in countries with low child mortality, but only ~65% effectiveness in countries with high child mortality. Similarly, oral polio vaccines have lower immunogenicity in developing country settings compared with high-resource settings. Data are more limited for oral cholera vaccines, but suggest lower titers among children compared with adults, and, for some vaccines, lower efficacy in endemic settings compared with non-endemic settings. These disparities are likely multifactorial, and available evidence suggests a role for maternal factors (e.g. transplacental antibodies, breastmilk), host factors (e.g. genetic polymorphisms-with the best evidence for rotavirus-or previous infection), and environmental factors (e.g. gut microbiome, co-infections). Overall, these data highlight the rather ambiguous and often contradictory nature of evidence on factors affecting oral vaccine response, cautioning against broad extrapolation of outcomes based on one population or one vaccine type. Meaningful impact on performance of oral vaccines will likely only be possible with a suite of interventions, given the complex and multifactorial nature of the problem, and the degree to which contributing factors are intertwined.


Investigating The Role Of The Nsp15 Amino-Terminal Domain In Nsp15 Function, Viral Replication, And Pathogenesis, Monika Evdokimova Jan 2025

Investigating The Role Of The Nsp15 Amino-Terminal Domain In Nsp15 Function, Viral Replication, And Pathogenesis, Monika Evdokimova

Dissertations

Identifying conserved mechanisms used by viruses to delay host innate responses can reveal potential targets for antiviral therapeutics. Here, we investigated coronavirus nonstructural protein 15 (nsp15), which encodes a highly conserved endoribonuclease (EndoU). EndoU functions as an immune antagonist by limiting the accumulation of viral replication intermediates that would otherwise be sensed by the host. Despite being a promising antiviral target, it has been difficult to develop small molecule inhibitors that target the EndoU active site. We generated nsp15 mutants of SARS-CoV-2 and mouse coronavirus MHV-A59 and identified conserved residues within the amino-terminal domain that are required for EndoU activity. …


Tamm-Horsfall Protein Augments Neutrophil Netosis During Urinary Tract Infection, Vicki Mercado-Evans, Holly Branthoover, Claude Chew, Camille Serchejian, Alexander B Saltzman, Marlyd E Mejia, Jacob J Zulk, Ingrid Cornax, Victor Nizet, Kathryn A Patras Jan 2025

Tamm-Horsfall Protein Augments Neutrophil Netosis During Urinary Tract Infection, Vicki Mercado-Evans, Holly Branthoover, Claude Chew, Camille Serchejian, Alexander B Saltzman, Marlyd E Mejia, Jacob J Zulk, Ingrid Cornax, Victor Nizet, Kathryn A Patras

Faculty, Staff and Students Publications

Urinary neutrophils are a hallmark of urinary tract infection (UTI), yet the mechanisms governing their activation, function, and efficacy in controlling infection remain incompletely understood. Tamm-Horsfall glycoprotein (THP), the most abundant protein in urine, uses terminal sialic acids to bind an inhibitory receptor and dampen neutrophil inflammatory responses. We hypothesized that neutrophil modulation is an integral part of THP-mediated host protection. In a UTI model, THP-deficient mice showed elevated urinary tract bacterial burdens, increased neutrophil recruitment, and more severe tissue histopathological changes compared with WT mice. Furthermore, THP-deficient mice displayed impaired urinary NETosis during UTI. To investigate the effect of …


Characterization Of Legionella Pneumophila Effector Protein Ceg10, Emmanuella Ofoka Jan 2025

Characterization Of Legionella Pneumophila Effector Protein Ceg10, Emmanuella Ofoka

Masters Theses & Specialist Projects

Legionella pneumophila, the causative agent of Legionnaires' disease, utilizes a Type IV secretion system (T4SS) to transport effector proteins into host cells. This bacterium is said to have over 300 effector proteins. Among these, the Ceg10 effector protein had remained uncharacterized, despite evidence suggesting the importance of bacterial effector proteins in the host-pathogen interaction. This study aimed to perform a structural and functional characterization of Ceg10 through transcriptomic, bioinformatics, and molecular analyses. Transcriptomic profiling of HEK 293T cells expressing Ceg10 revealed significant differential gene expression, with approximately 20 upregulated genes, including leucine-rich repeat, as well as other downregulated genes. …


Antimicrobial-Resistant Enterococcus In Urban Communities: Insights Into Human Infection Risks, Sumit Kumar Paudel Jan 2025

Antimicrobial-Resistant Enterococcus In Urban Communities: Insights Into Human Infection Risks, Sumit Kumar Paudel

Wayne State University Dissertations

The complexity of community risk factors and transmission routes has been a major challenge to the containment of community-acquired antibiotic resistance. Possible factors range from environmental contamination, antibiotic misuse, and human exposure via animals, food, the environment, and human-to-human transmission. What has been missing from previous research is the integration of findings in animal and environmental sectors with bacteria implicated in community infections. To gain a better understanding of antibiotic resistance acquired in the community, a one health approach is clearly needed. Specifically, we aim to investigate the prevalence of antibiotic-resistant Enterococcus in wildlife, their gene profiles in comparison with …


René Dubos: An Annotated Bibliography, Carol L. Moberg Jan 2025

René Dubos: An Annotated Bibliography, Carol L. Moberg

René Dubos: An Annotated Bibliography

René Dubos (1901–1982), a prominent 20th century scientist, humanist, and philosopher, was a prolific author. Affiliated for more than 50 years with The Rockefeller Institute for Medical Research/The Rockefeller University, his studies ranged from antibiotics and the role of bacteria in human diseases to formulating broad ecological and environmental questions affecting human health and disease. His seminal writings explore a lifelong belief that a living organism—whether microbe, human being, society, or the Earth itself—could be understood only through its relationships with everything else.

This comprehensive bibliography of more than a thousand works by René Dubos includes brief annotations for each …


Novel Infection By Mucor Hiemalis Kills Caenorhabditis Hosts Through Intestinal Perforation, Jay Ni Jan 2025

Novel Infection By Mucor Hiemalis Kills Caenorhabditis Hosts Through Intestinal Perforation, Jay Ni

West Chester University Graduate Theses, Dissertations, and Final Projects

The nematode Caenorhabditis elegans has emerged as a popular model system to investigate cell biology and host-pathogen interactions. Presently, C. elegans is studied as a natural host of intracellular pathogens such as microsporidia and Orsay virus along with extracellular bacterial and fungal pathogens. The use of C. elegans as a model in host-pathogen research is limited by the number of naturally occurring pathogens to the organism. Through a sampling project to identify new pathogens of C. elegans, we identified the fungus Mucor hiemalis as a pathogen of Caenorhabditis species. We observed the fungus in the intestinal lumen of wild-caught …


Genetic Analysis Of Methionine Restriction-Associated Mitochondrial Unfolded Protein Response Signaling., Josh D. Dodge Jan 2025

Genetic Analysis Of Methionine Restriction-Associated Mitochondrial Unfolded Protein Response Signaling., Josh D. Dodge

Biology Dissertations - Archive

The lifespan of an organism is dictated by various genetic and environmental factors. One such determinant is the health of mitochondria which are organelles that mediate various critical cell functions including a significant role in generating the vast supply of cellular energy. Indeed, the gradual decline of mitochondrial function is believed to be a hallmark and possible cause of aging. Paradoxically, mild mitochondrial dysfunction early in life extends lifespan in various model organisms. Cells use diverse approaches to promote mitochondrial homeostasis, including the transcriptional reprogramming of cells by mitochondrial unfolded protein response (UPRmt) to mitigate mitochondrial stress. Consistently, UPRmt activation …


Functional Analysis Of Ligand Binding Domain 2 Of Outer Surface Protein C Of Borreliella Burgdorferi, Gavin Z. Chambers Jan 2025

Functional Analysis Of Ligand Binding Domain 2 Of Outer Surface Protein C Of Borreliella Burgdorferi, Gavin Z. Chambers

Theses and Dissertations

Lyme disease, caused by the spirochete Borreliella burgdorferi, is the most common vector-borne infection in North America. A critical determinant of early mammalian infection is outer surface protein C (OspC), a highly variable lipoprotein that is indispensable for spirochete survival but whose precise function remains unresolved. OspC has been proposed to mediate diverse roles, including complement evasion, adhesion, tissue dissemination, and antiphagocytic activity, supporting the view that it is a multifunctional virulence factor. Structural studies have identified two putative ligand-binding domains (LBD1 and LBD2), with LBD2 forming a solvent-exposed crown at the membrane-distal end of the OspC dimer.

To …


The Role Of Horizontal Gene Transfer In Antibiotic Resistance Amidst Prevalent Community And Healthcare-Associated Mrsa Rates, Gabrielle Nascimento Jan 2025

The Role Of Horizontal Gene Transfer In Antibiotic Resistance Amidst Prevalent Community And Healthcare-Associated Mrsa Rates, Gabrielle Nascimento

Honors College Theses

In recent decades, cases of community-acquired MRSA (CA-MRSA) and healthcare-associated MRSA (HA-MRSA) have been on the rise. The ability of antibiotic resistance to transfer between microorganisms greatly expands its threat to the effective treatment and containment of bacterial infections. The mecA gene is found on a mobile cassette within the Staphylococcal cell and encodes for PBP2a, an alternate version of penicillin-binding protein (PBP) with less binding affinity for β-lactam antibiotics, increasing resistance to the effects of antibiotics. The goal of this research is to investigate the horizontal transfer of the mecA gene between various Staphylococcus species as well as to …


Wasting Disease Of A Marine Foundation Species Links Community Interactions To Disease Dynamics, Lillian R. Aoki, Olivia J. Graham, Reyn M. Yoshioka, Rebecca Maher, Lindsay Alma, Eileen E. Hofmann, Colleen A. Burge, Drew Harvell, Maya L. Groner Jan 2025

Wasting Disease Of A Marine Foundation Species Links Community Interactions To Disease Dynamics, Lillian R. Aoki, Olivia J. Graham, Reyn M. Yoshioka, Rebecca Maher, Lindsay Alma, Eileen E. Hofmann, Colleen A. Burge, Drew Harvell, Maya L. Groner

CCPO Publications

Infectious disease plays a key role in shaping marine communities, including in seagrass meadows, which form biodiverse coastal habitats. Eelgrass (Zostera marina) is the most widespread seagrass species and is susceptible to seagrass wasting disease, caused by the protist Labyrinthula zosterae. As a foundation species, eelgrass strongly influences ecosystem structure, function and services; recent work has begun to explore the links between critical community interactions and seagrass wasting disease. Here, we highlight recent advances about how the eelgrass community regulates and responds to seagrass wasting disease, from the microbiome to herbivores and filter feeders. We further show …