Elsevier

Current Opinion in Immunology

Volume 12, Issue 6, 1 December 2000, Pages 624-631
Current Opinion in Immunology

Review
Roles of mast cells and basophils in innate and acquired immunity

https://doi.org/10.1016/S0952-7915(00)00154-0Get rights and content

Abstract

There have been several recent advances in knowledge about mast cells and basophils in immune responses, of which some are particularly important: a role has been found for heparin in the storage of certain proteases and other mediators in mast cell cytoplasmic granules; an important role for mast cells in the development of several chronic aspects of an asthma model in mice has been discovered; and a new approach has been developed, based on the generation of mast cells from embryonic stem cells in vitro, to investigate mast cell function in vitro or in vivo.

Introduction

Mast cells and basophils share a number of similarities but they also differ in many aspects of natural history and function. Both cell types express the αβγ2 form of the high-affinity receptor for IgE (FcεRI) on their surface and both mast cells and basophils can be activated to secrete diverse preformed mediators and lipid mediators (the latter are synthesized de novo), as well as cytokines, after crosslinking of FcεRI-bound IgE with bivalent or multivalent antigen. However, recent work shows that mast cells can also play a critical role in innate immunity to bacterial infection and that mast cells and basophils can be activated by viral proteins. This review will discuss recent advances in our understanding of the effector and the potential immunoregulatory functions of mast cells and basophils during innate or acquired immune responses.

Mast cells and basophils not only are important effector cells in acute IgE-associated allergic reactions but also may contribute significantly to the expression of aspects of acquired immune responses that develop over hours (e.g. late-phase reactions [LPRs]) or days to weeks (e.g. chronic allergic inflammation) [1], [2], [3], [4], [5] (Fig. 1). Mast cells and basophils may also mediate immunoregulatory functions, both through their ability to produce certain cytokines and by other mechanisms [1], [2], [3], [4], [5], [6]. Before we discuss the potential roles of mast cells and basophils in acquired or innate immunity, we will provide some background on the biology of these two cell types.

Section snippets

Basic mast cell and basophil biology

Both mast cells and basophils are derived from CD34+ hematopoietic progenitor cells, such as those present in adult bone marrow; however, mast cells and basophils differ in natural history. Whereas basophils (like other granulocytes) typically mature in the bone marrow and then circulate in the peripheral blood, from where they can then be recruited into the tissues, mature mast cells typically do not circulate in the blood but complete their differentiation in vascularized tissues [1]. Under

Genetic approaches in studies of mast cell or basophil function

A particularly useful approach to study mast cell function in vivo is to employ genetically mast-cell-deficient WBB6F1-KitW/KitW-v mice (W/Wv mice), which lack expression of a functional c-kit receptor due to spontaneous mutations in both copies of c-kit [9], [17]. The mast cell activity in these W/Wv mice can be selectively reconstituted by the adoptive transfer of genetically compatible, in-vitro-derived mast cells; such mast cells can be derived in at least two ways: firstly, from the bone

Mast cells and basophils in acquired immunity

The best-studied forms of acquired immunity involving mast cells and basophils are examples of IgE-associated immune responses. The aggregation of FcεRIs that are occupied by IgE (e.g. following binding of IgE to multivalent antigens) is sufficient for initiating downstream signaling pathways that activate the cells to degranulate and also induce the de novo synthesis and secretion of lipid mediators and cytokines [20], [21], [22].

In vitro and in vivo studies in both mice and humans have

IgE-associated immune responses

Studies in ‘mast cell knockin’ mice show that mast cells are essential for virtually all of the augmented vascular permeability and tissue swelling that are associated with IgE-dependent passive cutaneous anaphylaxis reactions [1]. Several findings indicate that mast cells are critical for the immediate phase of IgE-associated ‘Type I’ reactions in humans as well [1], [2], [3], [4], [5], [31]. However, in many allergic patients, the immediate reaction to cutaneous antigenic challenge is

Host defense against parasites

Parasite infections are often associated with increased levels of circulating basophils and eosinophils, markedly increased serum levels of IgE (and therefore enhanced expression of FcεRI on basophils and mast cells) and increased numbers of mast cells and/or basophils in the affected tissues [1], [2], [3], [4], [5].

Although it has been difficult to prove that individual components of IgE-associated immune responses to parasites are truly essential for the expression of host immunity, W/Wv mice

Mast cells and basophils in innate immunity

‘Mast cell knockin’ mice were used to show that mast cells can represent a central component of innate host defense against certain bacterial infections, that the recruitment of circulating leukocytes with bactericidal properties is dependent on mast cells and that TNF-α is one important element of this response [10], [45], [46]. Whereas certain bacterial products—including lipopolysaccharide and at least one fimbrial adhesin [47radical dot]—can directly induce the release of some mast cell products,

Additional pathways for eliciting mast cell and/or basophil function during immune responses

Human basophils have been shown to respond to stimulation with immobilized secretory IgA (sIgA) by releasing both histamine and LTC4; however, this only occurs if the cells had first been primed by pretreatment with IL-3, IL-5 or GM-CSF [49]. Since IgA is the most abundant immunoglobulin isotype in mucosal secretions, this finding suggests that sIgA may contribute to basophil activation during immune responses at mucosal sites [49].

Protein L of Pneumococcus magnus and Protein A of

Conclusions

It seems very likely that mast cells and basophils express complex—and partially overlapping—roles in acquired and innate immunity (Fig. 4); these roles include both effector cell and, potentially, immunoregulatory activities.

Studies in mast-cell-reconstituted, genetically mast-cell-deficient mice—and correlative analyses in humans—indicate that mast cells can contribute to leukocyte infiltration, tissue remodeling and long-term functional changes in the context of IgE-associated acquired

Acknowledgements

Some of the work reviewed herein was supported by United States Public Health Service grants CA 72074, AI 23990 and AI 41995 (project 1), by Deutsche Forschungsgemeinschaft grant WE 2300/1 and/or by AMGEN Inc. SJG consults for AMGEN Inc. under terms that are in accordance with Stanford University conflict-of-interest policies.

References and recommended reading

Papers of particular interest, published within the annual period of review, have been highlighted as:

  • radical dot of special interest

  • radical dotradical dot of outstanding interest

References (55)

  • Galli SJ, Lantz CS: Allergy. In Fundamental Immunology, edn 4. Edited by Paul WE. Philadelphia: Lippincott-Raven Press;...
  • Schwartz LB, Huff TF: Biology of mast cells. In Allergy: Principles and Practice, edn 5. Edited by Middleton EJ, Reed...
  • DD Metcalfe et al.

    Mast cells

    Physiol Rev

    (1997)
  • SJ Galli

    Mast cells and basophils

    Curr Opin Hematol

    (2000)
  • CS Lantz et al.

    Role for interleukin-3 in mast-cell and basophil development and in immunity to parasites

    Nature

    (1998)
  • SJ Galli et al.

    The kit ligand, stem cell factor

    Adv Immunol

    (1994)
  • T Brunner et al.

    Human peripheral blood basophils primed by interleukin 3 (IL-3) produce IL-4 in response to immunoglobulin E receptor stimulation

    J Exp Med

    (1993)
  • D Jr MacGlashan et al.

    Secretion of IL-4 from human basophils. The relationship between IL-4 mRNA and protein in resting and stimulated basophils

    J Immunol

    (1994)
  • H Li et al.

    IL-13 released by and localized in human basophils

    J Immunol

    (1996)
  • DE Humphries et al.

    Heparin is essential for the storage of specific granule proteases in mast cells

    Nature

    (1999)
  • E Forsberg et al.

    Abnormal mast cells in mice deficient in a heparin-synthesizing enzyme

    Nature

    (1999)
  • L Li et al.

    Identification of basophilic cells that express mast cell granule proteases in the peripheral blood of asthma, allergy, and drug-reactive patients

    J Immunol

    (1998)
  • K Nocka et al.

    Molecular bases of dominant negative and loss of function mutations at the murine c-kit/white spotting locus: W37, Wv, W41 and W

    EMBO J

    (1990)
  • M Tsai et al.

    In vivo immunological function of mast cells derived from embryonic stem cells: an approach for the rapid analysis of even embryonic lethal mutations in adult mice in vivo

    Proc Natl Acad Sci USA

    (2000)
  • M Maurer et al.

    The c-kit ligand, stem cell factor, can enhance innate immunity through effects on mast cells

    J Exp Med

    (1998)
  • J-P Kinet

    The high-affinity IgE receptor (FcεRI): from physiology to pathology

    Annu Rev Immunol

    (1999)
  • H Turner et al.

    Signalling through the high-affinity IgE receptor FcεRI

    Nature

    (1999)
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