Mast cells play a critical role in the innate immune response to bacterial infection. They internalize and kill a variety of bacteria and process antigen for presentation to T cells via MHC molecules. Although mast cell phagocytosis appears to play a significant role during bacterial infection, little is known about the proteins involved in its regulation. In this study, we demonstrate that the SNARE protein SNAP29 is involved in mast cell phagocytosis. SNAP29 is localized in the endocytic pathway and is transiently recruited to Escherichia coli (E. coli)-containing phagosomes. Interestingly, overexpression of SNAP29 significantly increases the internalization and killing of E. coli, while it does not affect mast cell exocytosis of inflammatory mediators. To our knowledge, these data are the first to demonstrate a novel function of SNAP29 in mast cell phagocytosis and have implications in protection against bacterial infection.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3503860 | PMC |
| http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0049886 | PLOS |
Publication Analysis
Top Keywords
Similar Publications
Potential implications of granzyme B in keloids and hypertrophic scars through extracellular matrix remodeling and latent TGF-β activation.
Front Immunol
January 2025
International Collaboration on Repair Discoveries (ICORD) Centre, Vancouver Coastal Health Research Institute (VCHRI), University of British Columbia (UBC), Vancouver, BC, Canada.
Keloid scars (KS) and hypertrophic scars (HS) are fibroproliferative wound healing defects characterized by excessive accumulation of extracellular matrix (ECM) in the dermis of affected individuals. Although transforming growth factor (TGF)-β is known to be involved in the formation of KS and HS, the molecular mechanisms responsible for its activation remain unclear. In this study we investigated Granzyme B (GzmB), a serine protease with established roles in fibrosis and scarring through the cleavage of ECM proteins, as a potential new mediator of TGF-β activation in KS and HS.
View Article and Find Full Text PDFEpithelial cell diversity and immune remodeling in bladder cancer progression: insights from single-cell transcriptomics.
J Transl Med
January 2025
Department of Urology, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China.
Background: The progression of bladder cancer (BC) from non-muscle-invasive bladder cancer (NMIBC) to muscle-invasive bladder cancer (MIBC) significantly increases disease severity. Although the tumor microenvironment (TME) plays a pivotal role in this process, the heterogeneity of tumor cells and TME components remains underexplored.
Methods: We characterized the transcriptomes of single cells from 11 BC samples, including 4 NMIBC, 4 MIBC, and 3 adjacent normal tissues.
Zyxin-a novel detrimental target, is inhibited by Saikosaponin A during allergic asthma.
Phytomedicine
January 2025
School of Pharmacy, Health Science Center, Xi'an Jiaotong University, 76 Yanta West Road, Xi'an 710061, China. Electronic address:
Background: Allergic asthma is a heterogeneous disease involving numerous inflammatory cells. Mast cell (MC) plays a key role during allergic asthma. Saikosaponin A (SSA) inhibits MC activation and ameliorates allergic asthma, however, its underlying mechanism remains unclear.
View Article and Find Full Text PDFScratching promotes allergic inflammation and host defense via neurogenic mast cell activation.
Science
January 2025
Department of Dermatology, University of Pittsburgh, Pittsburgh, PA, USA.
Itch is a dominant symptom in dermatitis, and scratching promotes cutaneous inflammation, thereby worsening disease. However, the mechanisms through which scratching exacerbates inflammation and whether scratching provides benefit to the host are largely unknown. We found that scratching was required for skin inflammation in mouse models dependent on FcεRI-mediated mast cell activation.
View Article and Find Full Text PDFCharacterization of patients with clonal mast cells in the bone marrow with clinical significance not otherwise specified.
EClinicalMedicine
February 2025
French Reference Center for Mastocytosis (CEREMAST), Paris Cité University, Necker - Enfants Malades University Hospital, APHP, Paris, France.
Background: Systemic mastocytosis (SM) diagnosis requires the presence of 3 minor criteria or 1 major and 1 minor criterion according to the WHO 2016 classification. The aim of this study was to characterize patients with 1 or 2 minor SM criteria including mutation and/or aberrant expression of CD2 and/or CD25 on bone marrow (BM) mast cells (MCs), but without MC activation syndrome (MCAS) criteria.
Methods: We included eligible patients from two countries diagnosed between 2011 and 2021.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!