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Kawano S, Noda C, Itoh S, Urabe A, Fujii C, Ogawa I, Suzuki R, Hida S. Staphylococcal superantigen-like protein 3 triggers murine mast cell adhesion by binding to CD43 and augments mast cell activation. Genes Cells 2024; 29:397-416. [PMID: 38454012 DOI: 10.1111/gtc.13111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 02/16/2024] [Accepted: 02/19/2024] [Indexed: 03/09/2024]
Abstract
Staphylococcus aureus is a noteworthy pathogen in allergic diseases, as four staphylococcal exotoxins activate mast cells, a significant contributor to inflammation, in an IgE-independent manner. Although the adhesion of mast cells is an essential process for their immune responses, only a small number of exotoxins have been reported to affect the process. Here, we demonstrated that staphylococcal superantigen-like (SSL) 3, previously identified as a toll-like receptor 2 agonist, induced the adhesion of murine bone marrow-derived mast cells to culture substratum. SSL3-induced adhesion was mediated by fibronectin in an Arg-Gly-Asp (RGD) sequence-dependent manner, suggesting the integrins were involved in the process. Additionally, SSL3 was found to bind to an anti-adhesive surface protein CD43. SSL3 induced the adhesion of HEK293 cells expressing exogenous CD43, suggesting that CD43 is the target molecule for adhesion induced by SSL3. Evaluation of SSL3-derived mutants showed that the C-terminal region (253-326), specifically T285 and H307, are necessary to induce adhesion. SSL3 augmented the IL-13 production of mast cells in response to immunocomplex and SSL12. These findings reveal a novel function of SSL3, triggering cell adhesion and enhancing mast cell activation. This study would clarify the correlation between S. aureus and allergic diseases such as atopic dermatitis.
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Affiliation(s)
- Sae Kawano
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
| | - Chisaki Noda
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
| | - Saotomo Itoh
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
| | - Ayaka Urabe
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
| | - Chifumi Fujii
- Department of Biotechnology, Institute for Biomedical Sciences, Shinshu University, Matsumoto, Nagano Prefecture, Japan
- Department of Molecular Pathology, Shinshu University School of Medicine, Matsumoto, Nagano Prefecture, Japan
- Center for Medical Education and Clinical Training, Shinshu University School of Medicine, Matsumoto, Nagano Prefecture, Japan
| | - Isamu Ogawa
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
| | - Ryo Suzuki
- Laboratory of Hygienic Chemistry, Faculty of Pharmaceutical Science, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Ishikawa Prefecture, Japan
| | - Shigeaki Hida
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi Prefecture, Japan
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2
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Rahman S, Das AK. Staphylococcal superantigen-like protein 10 enhances the amyloidogenic biofilm formation in Staphylococcus aureus. BMC Microbiol 2023; 23:390. [PMID: 38062361 PMCID: PMC10701973 DOI: 10.1186/s12866-023-03134-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/22/2023] [Indexed: 12/18/2023] Open
Abstract
Staphylococcus aureus is a highly infectious pathogen that represents a significant burden on the current healthcare system. Bacterial attachment to medical implants and host tissue, and the establishment of a mature biofilm, play an important role in chronic diseases such as endocarditis, osteomyelitis and wound infections. These biofilms decrease bacterial susceptibility to antibiotics and immune defences, making the infections challenging to treatment. S. aureus produces numerous exotoxins that contribute to the pathogenesis of the bacteria. In this study, we have identified a novel function of staphylococcal superantigen-like protein 10 (SSL10) in enhancing the formation of staphylococcal biofilms. Biofilm biomass is significantly increased when SSL10 is added exogenously to bacterial cultures, whereas SSL2 and SSL12 are found to be less active. Exogenously added SSL10 mask the surface charge of the bacterial cells and lowers their zeta potential, leading to the aggregation of the cells. Moreover, the biofilm formation by SSL10 is governed by amyloid aggregation, as evident from spectroscopic and microscopic studies. These findings thereby give the first overview of the SSL-mediated amyloid-based biofilm formation and further drive the future research in identifying potential molecules for developing new antibacterial therapies against Staphylococcus aureus.
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Affiliation(s)
- Shakilur Rahman
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India
| | - Amit Kumar Das
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India.
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3
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Liu R, Zhang Y, Wang Y, Huang Y, Gao J, Tian X, Ma T, Zhang T. Anti-inflammatory effect of dictamnine on allergic rhinitis via suppression of the LYN kinase-mediated molecular signaling pathway during mast cell activation. Phytother Res 2023; 37:4236-4250. [PMID: 37329155 DOI: 10.1002/ptr.7904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 04/14/2023] [Accepted: 05/19/2023] [Indexed: 06/18/2023]
Abstract
Mast cells (MCs) are important therapeutic targets for allergic diseases. High-affinity immunoglobulin E (IgE) Fc receptors (FcεRI) trigger abnormal activation of MCs. Allergic rhinitis (AR) is an IgE-mediated antigen inhalation reaction that occurs in the nasal mucosa. MC aggravation and dysfunction were observed during the early stages of AR pathogenesis. Herb-derived dictamnine exhibits anti-inflammatory effects. Here, we investigated the pharmacological effects of herb-derived dictamnine on IgE-induced activation of MCs and an ovalbumin (OVA)-induced murine AR model. The results indicated that dictamnine attenuated OVA-induced local allergic reactions and reduced body temperature in OVA-challenged mice with active systemic anaphylaxis. Additionally, dictamnine decreased the frequency of nasal rubbing and sneezing in an OVA-induced murine AR model. Moreover, dictamnine inhibited FcεRI-activated MC activation in a dose-dependent manner without causing cytotoxicity, reduced the activation of the tyrosine kinase LYN in LAD2 cells, and downregulated the phosphorylation of PLCγ1, IP3R, PKC, Erk1/2, and Akt, which are downstream of LYN. In conclusion, dictamnine suppressed the OVA-stimulated murine model of AR and activated IgE-induced MCs via the LYN kinase-mediated molecular signaling pathway, suggesting that dictamnine may be a promising treatment for AR.
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Affiliation(s)
- Rui Liu
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Yonghui Zhang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Yuejin Wang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Yihan Huang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Jiapan Gao
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
| | - Xi Tian
- Department of Nephrology, The Affiliated Hospital of Northwest University, Xi'an, China
| | - Tianyou Ma
- School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Tao Zhang
- School of Pharmacy, Xi'an Jiaotong University, Xi'an, China
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4
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Ogata A, Hayashi K, Kitano T, Onozaki K, Itoh S, Hida S. Staphylococcal γ-hemolysins induce IL-4 production in murine basophils. Biochem Biophys Res Commun 2022; 632:107-112. [DOI: 10.1016/j.bbrc.2022.09.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 09/18/2022] [Indexed: 11/02/2022]
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5
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Kim G, Itoh S, Ito Y, Ohya S, Hida S. Identification of responsible amino acid residues in Staphylococcal superantigen-like 12 for the activation of mast cells. Genes Cells 2022; 27:559-567. [PMID: 35801715 DOI: 10.1111/gtc.12973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 07/04/2022] [Accepted: 07/06/2022] [Indexed: 11/30/2022]
Abstract
Staphylococcal superantigen-like 12 (SSL12) is reported to evoke the degranulation in murine mast cells. The allelic variant of SSL12 in the genome of reference strain NCTC8325 induced the degranulation of murine mast cells, that of MRSA252 strain did not, nevertheless relatively high sequence similarity (82%). To identify responsible amino acid residues of SSL12 for mast cell activation, we created a series of domain swap mutants and amino acid substitution mutants between the active and inactive variants. The mutants that harbored oligonucleotide/oligosaccharide binding (OB)-fold domain of the active variant activated mast cells. The replacement at position 56 (L56F) in the OB-fold domain diminished the mast cell stimulatory activity, and the combinatorial substitutions L56F/K92E, L56F/D95S, and L56F/S100V abolished the stimulatory activities of the mutant that harbored OB-fold domain of the active variant and the intact active variant. These indicate that the responsive elements of SSL12 for mast cell activation are in the OB-fold of SSL12, and L56 would be an essential amino acid residue for the activation of mast cells. The findings would contribute to the understanding of the molecular mechanism of SSL12 for mast cell activation and the development of toxoids preventing allergic inflammations associated with S. aureus. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Gwangdong Kim
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan.,Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Saotomo Itoh
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Yuma Ito
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
| | - Susumu Ohya
- Department of Pharmacology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Shigeaki Hida
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
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ClearColi as a platform for untagged pneumococcal surface protein A production: cultivation strategy, bioreactor culture, and purification. Appl Microbiol Biotechnol 2022; 106:1011-1029. [PMID: 35024919 PMCID: PMC8755982 DOI: 10.1007/s00253-022-11758-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 12/24/2021] [Accepted: 12/28/2021] [Indexed: 11/27/2022]
Abstract
Abstract
Several studies have searched for new antigens to produce pneumococcal vaccines that are more effective and could provide broader coverage, given the great number of serotypes causing pneumococcal diseases. One of the promising subunit vaccine candidates is untagged recombinant pneumococcal surface protein A (PspA4Pro), obtainable in high quantities using recombinant Escherichia coli as a microbial factory. However, lipopolysaccharides (LPS) present in E. coli cell extracts must be removed, in order to obtain the target protein at the required purity, which makes the downstream process more complex and expensive. Endotoxin-free E. coli strains, which synthesize a nontoxic mutant LPS, may offer a cost-effective alternative way to produce recombinant proteins for application as therapeutics. This paper presents an investigation of PspA4Pro production employing the endotoxin-free recombinant strain ClearColi® BL21(DE3) with different media (defined, auto-induction, and other complex media), temperatures (27, 32, and 37 °C), and inducers. In comparison to conventional E. coli cells in a defined medium, ClearColi presented similar PspA4Pro yields, with lower productivities. Complex medium formulations supplemented with salts favored PspA4Pro yields, titers, and ClearColi growth rates. Induction with isopropyl-β-d-thiogalactopyranoside (0.5 mM) and lactose (2.5 g/L) together in a defined medium at 32 °C, which appeared to be a promising cultivation strategy, was reproduced in 5 L bioreactor culture, leading to a yield of 146.0 mg PspA4Pro/g dry cell weight. After purification, the cell extract generated from ClearColi led to 98% purity PspA4Pro, which maintained secondary structure and biological function. ClearColi is a potential host for industrial recombinant protein production. Key points • ClearColi can produce as much PspA4Pro as conventional E. coli BL21(DE3) cells. • 10.5 g PspA4Pro produced in ClearColi bioreactor culture using a defined medium. • Functional PspA4Pro (98% of purity) was obtained in ClearColi bioreactor culture.Graphical abstract ![]() Supplementary Information The online version contains supplementary material available at 10.1007/s00253-022-11758-9.
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Tsuji T. [Modulation of Host Immune System by Staphylococcal Superantigen-like (SSL) Proteins]. YAKUGAKU ZASSHI 2021; 141:579-589. [PMID: 33790123 DOI: 10.1248/yakushi.20-00236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Staphylococcus aureus is a common pathogen causing a wide range of infectious diseases in humans and animals. This bacterium secretes a variety of exoproteins, including toxins known as superantigens, such as toxic shock syndrome toxin-1 (TSST-1) and enterotoxins. Staphylococcal superantigen-like (SSL) proteins are a family of exoproteins showing structural similarities with superantigens but no superantigenic activity. This family is composed of 14 members (SSL1-SSL14), and recent studies have revealed that these members exhibit various immunomodulatory activities: e.g., inhibition of antibody and complement functions, impairment of leukocyte trafficking, modulation of receptor functions, inappropriate activation of immunocytes, and inhibition of blood coagulation. These activities have been proposed to contribute to immune evasion of the bacteria. The interactions between SSL proteins and their target molecules in the host immune system and the pathophysiological roles of SSL proteins in the bacterial infections are reviewed in this article.
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Affiliation(s)
- Tsutomu Tsuji
- Hoshi University School of Pharmacy and Pharmaceutical Sciences.,Faculty of Pharmaceutical Sciences, Josai University
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Natarajan S, Govender K, Shobo A, Baijnath S, Arvidsson PI, Govender T, Lin J, Maguire GE, Naicker T, Kruger HG. Potential of brain mast cells for therapeutic application in the immune response to bacterial and viral infections. Brain Res 2021; 1767:147524. [PMID: 34015358 DOI: 10.1016/j.brainres.2021.147524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/21/2021] [Accepted: 05/11/2021] [Indexed: 10/21/2022]
Abstract
A wide range of microorganisms can infect the central nervous system (CNS). The immune response of the CNS provides limited protection against microbes penetrating the blood-brain barrier. This results in a neurological deficit and sometimes leads to high morbidity and mortality rates despite advanced therapies. For the last two decades, different studies have expanded our understanding of the molecular basis of human neuroinfectious diseases, especially concerning the contributions of mast cell interactions with other central nervous system compartments. Brain mast cells are multifunctional cells derived from the bone marrow and reside in the brain. Their proximity to blood vessels, their role as "first responders" their unique receptors systems and their ability to rapidly release pathogen responsive mediators enable them to exert a crucial defensive role in the host-defense system. This review describes key biological and physiological functions of mast cells, concerning their ability to recognize pathogens via various receptor systems, followed by a coordinated and selective mediator release upon specific interactions with pathogenic stimulating factors. The goal of this review is to direct attention to the possibilities for therapeutic applications of mast cells against bacterial and viral related infections. We also focus on opportunities for future research activating mast cells via adjuvants.
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Affiliation(s)
- Satheesh Natarajan
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Kamini Govender
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Adeola Shobo
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Sooraj Baijnath
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Per I Arvidsson
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa; Science for Life Laboratory, Drug Discovery and Development, Platform and Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Sweden
| | - Thavendran Govender
- Department of Chemistry, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
| | - Johnson Lin
- School of Life Sciences, University of KwaZulu-Natal, Durban 4001, South Africa; School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa
| | - Glenn Em Maguire
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Tricia Naicker
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
| | - Hendrik G Kruger
- Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa.
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Nishiyama S, Urabe A, Morikawa A, Kobayashi M, Onozaki K, Itoh S, Hida S. Staphylococcal superantigen-like 12 induces the production of interleukin 4 in murine basophils. Biochem Biophys Res Commun 2020; 532:200-204. [PMID: 32859377 DOI: 10.1016/j.bbrc.2020.08.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Accepted: 08/11/2020] [Indexed: 10/23/2022]
Abstract
S. aureus is associated with atopic dermatitis (AD). Several staphylococcal products including cell wall components, protease, and exotoxins, are thought to be involved in allergic inflammation of AD via activating immune cells such as T cells and mast cells. None of the staphylococcal exotoxins has been reported to activate a primary IL-4 inducer, basophils, that are known to produce large amounts of IL-4 in response to allergens as well as IgE-independent stimuli such as mites and helminth proteases. In this study, we investigated the ability of staphylococcal superantigen-like (SSL) family to activate basophils. SSL12, reported its activity to activate mast cells, induced the production of IL-4 in bone marrow derived basophils. SSL12 also evoked the release of IL-4 in freshly isolated murine basophils in bone marrow cells, as the depletion of basophils by basophils-specific antibodies against high-affinity IgE receptor and CD49b diminished the responsiveness of bone marrow cells for SSL12. These results propose the novel immune regulatory activity of SSL12 by inducing IL-4 in basophils, that contributes to the development of allergic inflammation disorders and the immune evasion of the cocci.
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Affiliation(s)
- Saishi Nishiyama
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Ayaka Urabe
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Arisa Morikawa
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Masato Kobayashi
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Kikuo Onozaki
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
| | - Saotomo Itoh
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan.
| | - Shigeaki Hida
- Department of Molecular and Cellular Health Sciences, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-Dori, Mizuho-ku, Nagoya, 467-8603, Japan
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10
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Mast Cell Responses to Viruses and Pathogen Products. Int J Mol Sci 2019; 20:ijms20174241. [PMID: 31480219 PMCID: PMC6747121 DOI: 10.3390/ijms20174241] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 08/20/2019] [Accepted: 08/26/2019] [Indexed: 01/07/2023] Open
Abstract
Mast cells are well accepted as important sentinel cells for host defence against selected pathogens. Their location at mucosal surfaces and ability to mobilize multiple aspects of early immune responses makes them critical contributors to effective immunity in several experimental settings. However, the interactions of mast cells with viruses and pathogen products are complex and can have both detrimental and positive impacts. There is substantial evidence for mast cell mobilization and activation of effector cells and mobilization of dendritic cells following viral challenge. These cells are a major and under-appreciated local source of type I and III interferons following viral challenge. However, mast cells have also been implicated in inappropriate inflammatory responses, long term fibrosis, and vascular leakage associated with viral infections. Progress in combating infection and boosting effective immunity requires a better understanding of mast cell responses to viral infection and the pathogen products and receptors we can employ to modify such responses. In this review, we outline some of the key known responses of mast cells to viral infection and their major responses to pathogen products. We have placed an emphasis on data obtained from human mast cells and aim to provide a framework for considering the complex interactions between mast cells and pathogens with a view to exploiting this knowledge therapeutically. Long-lived resident mast cells and their responses to viruses and pathogen products provide excellent opportunities to modify local immune responses that remain to be fully exploited in cancer immunotherapy, vaccination, and treatment of infectious diseases.
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