Helen Wang

ORCID: 0000-0003-4757-1583
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About
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Research Areas
  • Yersinia bacterium, plague, ectoparasites research
  • Microscopic Colitis
  • Bacterial Genetics and Biotechnology
  • Inflammatory Bowel Disease
  • Vibrio bacteria research studies
  • Bacterial Identification and Susceptibility Testing
  • Probiotics and Fermented Foods
  • Antibiotic Resistance in Bacteria
  • Clostridium difficile and Clostridium perfringens research
  • Bacillus and Francisella bacterial research
  • Urinary Tract Infections Management
  • Animal Nutrition and Physiology
  • Estrogen and related hormone effects
  • SAS software applications and methods
  • Reproductive tract infections research
  • Mast cells and histamine
  • Polyamine Metabolism and Applications
  • Virus-based gene therapy research
  • Advanced Electron Microscopy Techniques and Applications
  • Bacterial biofilms and quorum sensing
  • Genomics and Phylogenetic Studies
  • Autoimmune and Inflammatory Disorders
  • Peptidase Inhibition and Analysis
  • Salmonella and Campylobacter epidemiology
  • Microbial Natural Products and Biosynthesis

Uppsala University
2018-2025

Pfizer (United States)
2024

University of Toronto
2023

Science for Life Laboratory
2023

Sunnybrook Health Science Centre
2023

Dana-Farber Cancer Institute
2022

Western University
2020

Frederick National Laboratory for Cancer Research
2018-2020

Karolinska Institutet
2018-2019

Beth Israel Deaconess Medical Center
1992-2019

The aim of the current study was to assess economic impact using next-generation sequencing (NGS) versus single-gene testing strategies among patients with metastatic non-small-cell lung cancer (mNSCLC) from perspective Centers for Medicare & Medicaid Services (CMS) and US commercial payers.A decision analytic model considered who were newly diagnosed mNSCLC received programmed death ligand 1 genomic alteration tests-EGFR, ALK, ROS1, BRAF, MET, HER2, RET, NTRK1-using upfront NGS (all...

10.1200/po.18.00356 article EN JCO Precision Oncology 2019-05-16

Anecdotal observations by the authors of this study, together with results a few previous smaller studies, suggest that children new-onset (previously untreated) ulcerative colitis (UC) may occasionally present discontinuous disease, relative or absolute rectal sparing, and lack histologic features ofchronicity. Therefore, objectives study were to determine clinical pathologic UC in compare initial presentation group control adults.Routinely processed colonic mucosal biopsies from 73...

10.1097/00000478-200402000-00006 article EN The American Journal of Surgical Pathology 2004-01-16

Abstract Heteroresistance is a medically relevant phenotype where small antibiotic-resistant subpopulations coexist within predominantly susceptible bacterial populations. reduces treatment efficacy across diverse species and antibiotic classes, yet its genetic physiological mechanisms remain poorly understood. Here, we investigated multi-resistant Klebsiella pneumoniae isolate identified three primary drivers of gene dosage-dependent heteroresistance for several classes: tandem...

10.1038/s41467-024-48233-0 article EN cc-by Nature Communications 2024-05-10

The foodborne pathogen Yersinia enterocolitica causes gastrointestinal infections worldwide. In the spring of 2019, Swedish Public Health Agency and Statens Serum Institut in Denmark independently identified an outbreak caused by 4/O:3 that after sequence comparison turned out to be a cross-border outbreak. A trace-back investigation suggested shipments fresh prewashed spinach from Italy as common source for Here, we determined genome sequences five Y. clinical isolates during using...

10.3389/fmicb.2021.664665 article EN cc-by Frontiers in Microbiology 2021-05-13

Abstract Chlamydia trachomatis (CT) may employ persistence to evade antimicrobial clearance, possibly residing in the gastrointestinal tract. This study assessed reliability of droplet digital PCR (ddPCR) CT detection, its functionality viability assessment, and predictions on transmission dynamics by combining (vPCR) clinical data from 52 infected women. The ddPCR showed 94% positive 100% negative agreement with Abbott Alinity STI-M for endocervical samples, 92% 87% rectal samples....

10.1038/s41598-025-85297-4 article EN cc-by Scientific Reports 2025-01-10

This challenge aims to evaluate the capabilities of audio encoders, especially in context multi-task learning and real-world applications. Participants are invited submit pre-trained encoders that map raw waveforms continuous embeddings. These will be tested across diverse tasks including speech, environmental sounds, music, with a focus on usability. The features two tracks: Track A for parameterized evaluation, B parameter-free evaluation. provides platform evaluating advancing...

10.48550/arxiv.2501.15302 preprint EN arXiv (Cornell University) 2025-01-25

Abstract Pathogenic bacteria sense and respond to environmental fluctuations, a capability essential for establishing successful infections. The YmoA/Hha protein family are conserved transcription regulators in Enterobacteriaceae, playing critical role these responses. Specifically, YmoA Yersinia adjusts the expression of virulence-associated traits upon temperature shift. Still, molecular mechanisms transducing signals through remain elusive. Our study employs nuclear magnetic resonance...

10.1038/s42003-025-07675-y article EN cc-by Communications Biology 2025-02-13

Geophila repens (L.) I.M. Johnst (Rubiaceae) is a traditional medicinal plant used in Sri Lanka for the treatment of bacterial infections. Due to its rich endophytic fungi content, it was postulated that endophytically-produced specialized metabolites may be responsible purported antibacterial effects. To test this hypothesis, eight pure fungal cultures were isolated from G. then extracted and screened activity disc diffusion assay against Staphylococcus aureus, Bacillus cereus, Escherichia...

10.1016/j.fitote.2023.105496 article EN cc-by Fitoterapia 2023-03-28

Abstract Ebselen is a well-known synthetic compound mimicking glutathione peroxidase (GPx), which catalyses some vital reactions that protect against oxidative damage. Based on large number of in vivo and vitro studies, various mechanisms have been proposed to explain its actions multiple targets. It targets thiol-related compounds, including cysteine, glutathione, thiol proteins (e.g., thioredoxin reductase). Owing this, ebselen unique multifunctional agent with important effects...

10.1017/erm.2021.14 article EN Expert Reviews in Molecular Medicine 2021-01-01

Keloid is a pathological skin scar formation with complex and unclear molecular pathology mechanism. Novel biomarkers associated mechanisms are needed to improve current therapies.To identify novel underlying of keloids.Six pairs keloid tissues corresponding normal were quantitatively analyzed by high-resolution label-free mass spectrometry-based proteomics approach. Differential protein expression data was further comprehensive bioinformatics approach mechanistic pathways for formation....

10.1002/prca.202100127 article EN cc-by PROTEOMICS - CLINICAL APPLICATIONS 2022-04-18

Campylobacter jejuni is the primary cause of bacterial gastroenteritis worldwide, infecting humans mostly through consumption contaminated poultry. C. common in gut wild birds, and shows distinct strain-specific association to particular bird species. This contrasts with farm animals, which several genotypes co-exist. It unclear if barriers restricting transmission between host species such specialist strains are related environmental factors as contact species, survival environment etc. or...

10.3389/fmicb.2018.00591 article EN cc-by Frontiers in Microbiology 2018-03-29

Ulcerative colitis (UC) is a disease that normally limited to involvement of the colon. Terminal ileitis in patients with UC only inactive or mildly active has never been investigated. The aim this prospective study was determine prevalence and significance among enrolled an endoscopic surveillance program.The consisted 72 90 healthy controls who underwent screening colonoscopy, respectively. histologic features terminal ileum (both groups) colon (UC group only) were evaluated standardized...

10.1097/mib.0000000000000911 article EN Inflammatory Bowel Diseases 2016-08-30

Pathogenic Yersinia spp. depend on the activity of a potent virulence plasmid-encoded ysc/yop type 3 secretion system (T3SS) to colonize hosts and cause disease. It was recently shown that pseudotuberculosis upregulates plasmid copy number (PCN) during infection resulting elevated gene dose T3SS genes is essential for virulence. When how this novel regulatory mechanism deployed regulates replication unknown. In present study, we applied droplet digital PCR (ddPCR) investigate dynamics Y. PCN...

10.1128/iai.00710-20 article EN cc-by Infection and Immunity 2021-01-21

Antibiotics are essential for treating infections and reducing risks during medical interventions.However, many commonly used antibiotics lack the physiochemical properties an efficient oral administration when systemic infection.Instead, we reliant on intravenous delivery, which presents complications outside of clinical settings.Developing novel formulations is a potential solution to this problem.We engineered hexosome cubosome liquid crystal nanoparticles (LCNPs) characterized by...

10.1016/j.jcis.2024.08.230 article EN cc-by Journal of Colloid and Interface Science 2024-08-31

ABSTRACT Urinary tract infections (UTIs), traditionally dominated by Gram-negative pathogens, are increasingly complicated antimicrobial-resistant Enterococcus spp. in hospital settings. This study screened urine samples from 210 ICU patients at Uppsala University Hospital (June 2020 - September 2021), identifying 39 unique PhenePlate™-RF types across E. faecium , faecalis and durans . isolates showed considerable genetic diversity, primarily within clonal complex 17 (CC17), known for its...

10.1101/2024.10.18.619042 preprint EN bioRxiv (Cold Spring Harbor Laboratory) 2024-10-18

Abstract To determine whether fine‐needle aspiration biopsy (FNAB) can differentiate between comedo (C‐DCIS) and noncomedo ductal carcinoma in situ (NC‐DCIS), we reviewed retrospectively the preoperative FNAB surgical slides of 13 cases DCIS with adequate cytologic material. Eight were NC‐DCIS 5 C‐DCIS. Three (60 percent) C‐DCIS 7 (88%) nonpalpable lesions biopsied under conventional mammographic guidance. (60%) but only 2 (25%) considered either suspicious or positive for malignancy on...

10.1002/dc.2840080606 article EN Diagnostic Cytopathology 1992-11-01

Dozens of Gram negative pathogens use one or more type III secretion systems (T3SS) to disarm host defenses occupy a beneficial niche during infection organism. While the T3SS represents an attractive drug target and dozens compounds with inhibitory activity have been identified, few inhibitors validated mode action determined. One issue is lack standardized orthogonal assays following high throughput screening. Using training set commercially available previously shown possess activity, we...

10.3389/fcimb.2018.00404 article EN cc-by Frontiers in Cellular and Infection Microbiology 2018-11-22

Age-related hearing loss (ARHL) is associated with cognitive dysfunction; however, the detailed underlying mechanisms remain unclear. The aim of this study to investigate potential mechanism a system genetics approach. A transcriptome-wide association was performed on aged (12-32 months old) BXD mice strains. hippocampus gene expression obtained from 56 strains, and acuity assessed 54 Further correlation analysis identified total 1,435 hearing-related genes in (p < 0.05). Pathway these...

10.3389/fnins.2021.745668 article EN cc-by Frontiers in Neuroscience 2021-11-17

The impermeability barrier provided by the outer membrane of enteric bacteria, a feature lacking in Gram-positive plays major role maintaining resistance to numerous antimicrobial compounds and antibiotics. Here we demonstrate that mutational inactivation spr, coding for muramyl endopeptidase, significantly sensitizes Salmonella enterica serovar Typhimurium vancomycin without any accompanying apparent growth defect or destabilization. A similar phenotype was not achieved deleting genes...

10.3389/fmicb.2018.02941 article EN cc-by Frontiers in Microbiology 2018-12-14

Mast cells are abundant in melanoma tumors, and studies suggest that they can be either detrimental or protective for growth. However, the underlying mechanisms not fully understood.Here, we adopted an established hanging-drop spheroid system to investigate how mast influence growth phenotype a 3-D context. To address mechanism, conducted transcriptomic pathway analyses.In presence of cell-conditioned medium, spheroids was profoundly reduced. Transcriptomic analysis revealed medium had...

10.21873/anticanres.16290 article EN cc-by-nc-nd Anticancer Research 2023-03-27

Microscopic ileitis and its association with pancolitis in adults ulcerative colitis (UC) have been described. The incidence of associations colonic disease pediatric UC have, however, not thoroughly investigated. This study was undertaken to examine the prevalence microscopic ileal inflammation at time initial diagnosis a cohort children UC.We reviewed colonoscopy biopsy data from 105 young treatment naïve UC; mucosal biopsies were available on all patients. Ileal examined for presence...

10.1097/mpg.0000000000002272 article EN Journal of Pediatric Gastroenterology and Nutrition 2019-02-02
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