Publications (56)490.91 Total impact
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Article: Inflammatory Monocytes Recruited to Allergic Skin Acquire an Anti-inflammatory M2 Phenotype via Basophil-Derived Interleukin-4.
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ABSTRACT: Monocytes and macrophages are important effectors and regulators of inflammation, and both can be divided into distinct subsets based on their phenotypes. The developmental and functional relationship between individual subsets of monocytes and those of macrophages has not been fully elucidated, although Ly-6C(+)CCR2(+) inflammatory and Ly-6C(-)CCR2(-) resident monocytes are generally thought to differentiate into M1 (classically activated) and M2 (alternatively activated) macrophages, respectively. Here we show that inflammatory monocytes recruited to allergic skin acquired an M2-like phenotype in response to basophil-derived interleukin-4 (IL-4) and exerted an anti-inflammatory function. CCR2-deficient mice unexpectedly displayed an exacerbation rather than alleviation of allergic inflammation, in spite of impaired recruitment of inflammatory monocytes to skin lesions. Adoptive transfer of inflammatory monocytes from wild-type but not IL-4 receptor-deficient mice dampened the exacerbated inflammation in CCR2-deficient mice. Thus, inflammatory monocytes can be converted from being proinflammatory to anti-inflammatory under the influence of basophils in allergic reactions.Immunity 02/2013; · 21.64 Impact Factor -
Article: A Novel Mechanism for the Autonomous Termination of Pre-B Cell Receptor Expression via Induction of Lysosome-Associated Protein Transmembrane 5.
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ABSTRACT: The expression of the pre-B cell receptor (BCR) is confined to the early stage of B cell development, and its dysregulation is associated with anomalies of B-lineage cells, including leukemogenesis. Previous studies suggested that the pre-BCR signal might trigger the autonomous termination of pre-BCR expression even before the silencing of pre-BCR gene expression to prevent sustained pre-BCR expression. However, the underlying mechanism remains ill defined. Here we demonstrate that the pre-BCR signal induces the expression of lysosome-associated protein transmembrane 5 (LAPTM5), which leads to the prompt downmodulation of the pre-BCR. While LAPTM5 induction had no significant impact on the internalization of cell surface pre-BCR, it elicited the translocation of a large pool of intracellular pre-BCR from the endoplasmic reticulum to the lysosomal compartment concomitantly with a drastic reduction of the level of intracellular pre-BCR proteins. This reduction was inhibited by lysosomal inhibitors, indicating the lysosomal degradation of the pre-BCR. Notably, the LAPTM5 deficiency in pre-B cells led to the augmented expression level of surface pre-BCR. Collectively, the pre-BCR induces the prompt downmodulation of its own expression through the induction of LAPTM5, which promotes the lysosomal transport and degradation of the intracellular pre-BCR pool and, hence, limits the supply of pre-BCR to the cell surface.Molecular and cellular biology 09/2012; 32(21):4462-71. · 6.06 Impact Factor -
Article: Melanocortin receptors 1 and 5 might mediate inhibitory effects of α-melanocyte-stimulating hormone on antigen-induced chronic allergic skin inflammation in IgE transgenic mice.
Journal of Investigative Dermatology 03/2012; 132(7):1925-7. · 6.31 Impact Factor -
Article: Th2-inducing cytokines IL-4 and IL-33 synergistically elicit the expression of transmembrane TNF-α on macrophages through the autocrine action of IL-6.
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ABSTRACT: Tumor necrosis factor-α (TNF-α) is a potent proinflammatory cytokine produced predominantly by activated macrophages, and plays a central role in the protective immunity against intracellular pathogens and the pathogenesis of autoimmune and inflammatory diseases. While both the soluble and transmembrane forms of TNF-α (sTNF-α and tmTNF-α) are biologically functional, the latter but not the former acts as a receptor besides as a ligand, and transmit a retrograde signal in a cell-to-cell contact manner. The production of TNF-α by macrophages under Th2-type (allergic) inflammatory conditions has been ill defined, compared to that under Th1-type inflammatory conditions. Here we examined the effect of representative Th2-inducing cytokines IL-4 and IL-33 on the TNF-α expression in macrophages. IL-4 induced the production of neither sTNF-α nor tmTNF-α while IL-33 promoted the production of sTNF-α with no detectable tmTNF-α. Notably, the combination of IL-4 and IL-33 elicited the tmTNF-α expression on macrophages, in addition to the enhanced production of sTNF-α and IL-6. The IL-4/IL-33-elicited tmTNF-α expression was not observed in IL-6-deficient macrophages, suggesting the involvement of macrophage-derived IL-6 in the tmTNF-α expression. Indeed, the stimulation of macrophages with the combination of IL-4 and IL-6 induced the tmTNF-α expression with no detectable production of sTNF-α. Thus, IL-4 and IL-33 synergistically elicit the tmTNF-α expression on macrophages through the autocrine action of IL-6.Biochemical and Biophysical Research Communications 03/2012; 420(1):114-8. · 2.48 Impact Factor -
Article: Role of mast cells and basophils in IgE responses and in allergic airway hyperresponsiveness.
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ABSTRACT: We established a diphtheria toxin (DT)-based conditional deletion system using Il4 enhancer elements previously shown to be specific for IL-4 production in mast cells (MCs) or basophils (Mas-TRECK and Bas-TRECK mice). DT treatment of Bas-TRECK mice resulted in specific deletion of basophils, whereas both MCs and basophils were deleted in Mas-TRECK mice. DT-treated Mas-TRECK mice had impaired passive cutaneous anaphylaxis, IgE-mediated passive systemic anaphylaxis, and IgE-mediated chronic allergic inflammation, whereas DT-treated Bas-TRECK mice had impaired IgE-mediated chronic allergic inflammation. Using these mice, we also sought to tease out the role of MCs and basophils in airway hyperresponsiveness (AHR). Although MC deletion resulted in a slight increase in basal Ag-specific IgE levels and significant increases in basal IgE levels, we found that this deletion markedly impaired the AHR effector phase and was accompanied by decreased histamine levels. By contrast, basophil deletion had no effect on the AHR effector phase or on IgE production induced by systemic OVA immunization. Our results, using these newly established Mas-TRECK and Bas-TRECK models, demonstrated an indispensable role for MCs as effector cells in AHR.The Journal of Immunology 02/2012; 188(4):1809-18. · 5.79 Impact Factor -
Article: Basophil-derived mouse mast cell protease 11 induces microvascular leakage and tissue edema in a mast cell-independent manner.
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ABSTRACT: Mouse mast cell protease 11 (mMCP-11) is the most recently identified member of the mouse mast cell tryptase family. This tryptase is preferentially produced by basophils in contrast to other members that are expressed by mast cells but not basophils. Although blood-circulating basophils have long been considered as minor and redundant relatives of tissue-resident mast cells, recent studies illustrated that basophils and mast cells play distinct roles in vivo. To explore the in vivo role of basophil-derived mMCP-11, here we prepared recombinant mMCP-11 and its protease-dead mutant. Subcutaneous injection of the wild-type mMCP-11 but not the mutant induced edematous skin swelling with increased microvascular permeability in a dose-dependent manner. No apparent infiltration of proinflammatory cells including neutrophils and eosinophils was detected in the skin lesions. The cutaneous swelling was abolished by the pretreatment of mice with indomethacin, a cyclooxygenase inhibitor, suggesting the major contribution of prostaglandins to the microvascular leakage. Of note, the cutaneous swelling was elicited even in mast cell-deficient mice, indicating that mast cells are dispensable for the mMCP-11-induced cutaneous swelling. Thus, basophil-derived mMCP-11 can induce microvascular leakage via prostaglandins in a mast cell-independent manner, and may contribute to the development of basophil-mediated inflammatory responses.Biochemical and Biophysical Research Communications 11/2011; 415(4):709-13. · 2.48 Impact Factor -
Article: NK cell-depleting anti-asialo GM1 antibody exhibits a lethal off-target effect on basophils in vivo.
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ABSTRACT: NK cells are innate immune lymphocytes and play a key role in both innate and adaptive immunity. Their pivotal functions in vivo have been illustrated in mice by means of their ablation with NK cell-depleting Abs, particularly anti-asialo GM1 (ASGM1). In this study, we show that the whole population of basophils constitutively expresses ASGM1 as well as CD49b (DX5) as does the NK cell population and was ablated in vivo by anti-ASGM1 as efficiently as by a basophil-depleting anti-FcεRIα Ab. Anti-ASGM1-mediated basophil depletion was operative as for NK cell depletion in various mouse strains, irrespective of NK1 allotype and MHC H2 haplotype, including C57BL/6, BALB/c, C3H, and A/J mice. These results identified basophils as a previously unrecognized target of anti-ASGM1-mediated cell depletion and raised concern about possible contribution of basophils, rather than or in addition to NK cells, to some of phenotypes observed in anti-ASGM1-treated mice. Indeed, regardless of the presence or absence of NK cells in mice, anti-ASGM1 treatment abolished the development of IgE-mediated chronic cutaneous allergic inflammation as efficiently as did the treatment with basophil-depleting Ab. Given the fact that basophils have recently been shown to play crucial roles in a variety of immune responses, our finding of the off-target effect on basophils issues a grave warning about the use of anti-ASGM1 and underscores the need for careful interpretation of phenotypes observed in anti-ASGM1-treated mice.The Journal of Immunology 05/2011; 186(10):5766-71. · 5.79 Impact Factor -
Article: Defective IL-10 signaling in hyper-IgE syndrome results in impaired generation of tolerogenic dendritic cells and induced regulatory T cells.
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ABSTRACT: Hyper-IgE syndrome (HIES) is a primary immunodeficiency characterized by recurrent staphylococcal infections and atopic dermatitis associated with elevated serum IgE levels. Although defective differentiation of IL-17-producing CD4(+) T cells (Th17) partly accounts for the susceptibility to staphylococcal skin abscesses and pneumonia, the pathogenesis of atopic manifestations in HIES still remains an enigma. In this study, we examined the differentiation and function of Th1, Th2, regulatory T cells (T(reg) cells), and dendritic cells (DCs) in HIES patients carrying either STAT3 or TYK2 mutations. Although the in vitro differentiation of Th1 and Th2 cells and the number and function of T(reg) cells in the peripheral blood were normal in HIES patients with STAT3 mutations, primary and monocyte-derived DCs showed defective responses to IL-10 and thus failed to become tolerogenic. When treated with IL-10, patient DCs showed impaired up-regulation of inhibitory molecules on their surface, including PD-L1 and ILT-4, compared with control DCs. Moreover, IL-10-treated DCs from patients displayed impaired ability to induce the differentiation of naive CD4(+) T cells to FOXP3(+) induced T(reg) cells (iT(reg) cells). These results suggest that the defective generation of IL-10-induced tolerogenic DCs and iT(reg) cells may contribute to inflammatory changes in HIES.Journal of Experimental Medicine 02/2011; 208(2):235-49. · 13.85 Impact Factor -
Article: Emerging roles of basophils in protective immunity against parasites.
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ABSTRACT: Basophils, the least common type of granulocyte, have long been considered as minor effector cells in allergic responses because of their ability to release allergy-inducing chemical mediators such as histamine and leukotriene C4. However, it is unlikely that many animal species evolutionarily conserve basophils to only elicit allergic responses without any host-beneficial function. The study of basophils has been hampered by their rarity and difficult identification, as well as the lack of suitable animal models. Recent studies using novel analytical tools, including basophil-depleting antibodies and genetically engineered mice deficient only in basophils, have illuminated the crucial and nonredundant roles for basophils in protective immunity against both ecto- and endoparasites.Trends in Immunology 12/2010; 32(3):125-30. · 10.40 Impact Factor -
Article: IgG-mediated systemic anaphylaxis to protein antigen can be induced even under conditions of limited amounts of antibody and antigen.
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ABSTRACT: Systemic anaphylaxis is an acute, severe, and potentially fatal allergic reaction. Two classes of antibodies, IgE and IgG, contribute to the development of anaphylaxis in mice, through different mechanisms with distinct usage of effector cells and chemical mediators. Larger quantities of antibody and antigen are reportedly required to induce IgG-mediated anaphylaxis than IgE-mediated one, suggesting that the former may not happen as frequently as the latter in real life. To readdress this issue, we established in the present study a novel mouse model of passive IgG-mediated systemic anaphylaxis to a native protein antigen, ovalbumin (OVA), rather than artificially haptenated protein antigens used in previous studies. Passive sensitization of mice with a cocktail of but not individual IgG1 mAbs specific to distinct OVA epitopes elicited systemic anaphylaxis in response to OVA challenge. Importantly, much smaller doses of antibody and antigen than previously reported were sufficient for the induction of IgG-mediated systemic anaphylaxis. Moreover, a relatively small dose of antigen could induce severe anaphylaxis through both IgE- and IgG-mediated mechanisms when mice had been passively sensitized with antigen-specific IgE and IgG. These results strongly suggest that IgG-mediated systemic anaphylaxis is not rare among antibody-mediated systemic anaphylaxis, in contrast to previous thought, and significantly contributes to active systemic anaphylaxis in real life, at least in mice.Biochemical and Biophysical Research Communications 10/2010; 402(4):742-6. · 2.48 Impact Factor -
Article: An atopic dermatitis-like skin disease with hyper-IgE-emia develops in mice carrying a spontaneous recessive point mutation in the Traf3ip2 (Act1/CIKS) gene.
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ABSTRACT: Spontaneous mutant mice that showed high levels of serum IgE and an atopic dermatitis (AD)-like skin disease were found in a colony of the KOR inbred strain that was derived from Japanese wild mice. No segregation was observed between hyper-IgE-emia and dermatitis in (BALB/c x KOR mutant) N(2) mice, suggesting that the mutation can be attributed to a single recessive locus, which we designated adjm (atopic dermatitis from Japanese mice). All four adjm congenic strains in different genetic backgrounds showed both hyper-IgE-emia and dermatitis, although the disease severity varied among strains. Linkage analysis using (BALB/c x KOR-adjm/adjm) N(2) mice restricted the potential adjm locus to the 940 kb between D10Stm216 and D10Stm238 on chromosome 10. Sequence analysis of genes located in this region revealed that the gene AI429613, which encodes the mouse homologue of the human TNFR-associated factor 3-interacting protein 2 (TRAF3IP2) protein (formerly known as NF-kappaB activator 1/connection to IkappaB kinase and stress-activated protein kinase/Jun kinase), carried a single point mutation leading to the substitution of a stop codon for glutamine at amino acid position 214. TRAF3IP2 has been shown to function as an adaptor protein in signaling pathways mediated by the TNFR superfamily members CD40 and B cell-activating factor in epithelial cells and B cells as well as in the IL-17-mediated signaling pathway. Our results suggest that malfunction of the TRAF3IP2 protein causes hyper-IgE-emia through the CD40- and B cell-activating factor-mediated pathway in B cells and causes skin inflammation through the IL-17-mediated pathway. This study demonstrates that the TRAF3IP2 protein plays an important role in AD and suggests the protein as a therapeutic target to treat AD.The Journal of Immunology 08/2010; 185(4):2340-9. · 5.79 Impact Factor -
Article: Selective ablation of basophils in mice reveals their nonredundant role in acquired immunity against ticks.
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ABSTRACT: Ticks are ectoparasitic arthropods that can transmit a variety of microorganisms to humans and animals during blood feeding, causing serious infectious disorders, including Lyme disease. Acaricides are pharmacologic agents that kill ticks. The emergence of acaricide-resistant ticks calls for alternative control strategies for ticks and tick-borne diseases. Many animals develop resistance to ticks after repeated infestations, but the nature of this acquired anti-tick immunity remains poorly understood. Here we investigated the cellular and molecular mechanisms underlying acquired resistance to Haemaphysalis longicornis ticks in mice and found that antibodies were required, as was IgFc receptor expression on basophils but not on mast cells. The infiltration of basophils at tick-feeding sites occurred during the second, but not the first, tick infestation. To assess the requirement for basophil infiltration to acquired tick resistance, mice expressing the human diphtheria toxin receptor under the control of the mast cell protease 8 (Mcpt8) promoter were generated. Diphtheria toxin administration to these mice selectively ablated basophils. Diphtheria toxin-mediated basophil depletion before the second tick infestation resulted in loss of acquired tick resistance. These data provide the first clear evidence, to our knowledge, that basophils play an essential and nonredundant role in antibody-mediated acquired immunity against ticks, which may suggest new strategies for controlling tick-borne diseases.The Journal of clinical investigation 08/2010; 120(8):2867-75. · 15.39 Impact Factor -
Article: Nonredundant roles of basophils in immunity.
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ABSTRACT: Basophils are the rarest granulocytes and represent less than 1% of peripheral blood leukocytes. They are evolutionarily conserved in many animal species, but their functional significance remained an enigma long after their discovery by Paul Ehrlich in 1879. Studies of basophils were hindered by their rarity, by difficulties in identifying them, and by the paucity of useful analytical tools. Because basophils display several characteristics shared by tissue-resident mast cells, they were often considered minor and possibly redundant relatives of mast cells or even blood-circulating precursors of mast cells. However, newly developed tools for their functional analysis, including basophil-depleting antibodies and genetically engineered mice deficient only in basophils, have fueled basophil research and defined previously unrecognized functions of basophils. We now appreciate that basophils play nonredundant roles in acquired immunity regulation, protective immunity to pathogens, and immunological disorders such as allergy and autoimmunity.Annual Review of Immunology 04/2010; 29:45-69. · 52.76 Impact Factor -
Article: Role for basophils in systemic anaphylaxis.
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ABSTRACT: For more than 100 years since the discovery of basophils by Paul Ehrlich, the functional significance of this rare leukocyte as compared to mast cells has remained an enigma. Studies on basophils have long been hampered by their rarity (less than 1% of peripheral blood leukocytes) and the lack of useful analytical tools such as model animals deficient only in basophils. Recent studies have now defined previously-unrecognized roles for basophils in both allergic responses and immune regulation, and markedly changed our image of basophils, from a neglected minority to a key player in the immune system. We have recently demonstrated that basophils and mast cells play distinct roles in systemic anaphylaxis in mice. Basophils are dispensable for IgE-mediated systemic anaphylaxis unlike mast cells. Instead, basophils play the major role in IgG-mediated systemic anaphylaxis. In vivo depletion of basophils protects mice from anaphylactic death. Upon capture of IgG-allergen complexes, basophils release platelet-activating factor that increases vascular permeability, leading to anaphylactic shock. Thus, there are two major, distinct pathways to allergen-induced systemic anaphylaxis: one mediated by basophils, IgG and platelet-activating factor, and the other 'classical' pathway mediated by mast cells, IgE and histamine.Progress in allergy 01/2010; 95:85-97. -
Article: [The roles for basophils in allergy].
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ABSTRACT: Basophils are the least common granulocytes, and account for less than 1% of peripheral blood leukocytes. Because of this minority status and their phenotypic similarity to mast cells, basophils have often been neglected in immunological studies or considered to have minor, redundant roles in immune responses in vivo. We have recently demonstrated that basophils play critical roles in IgG-mediated systemic anaphylaxis and IgE-mediated chronic allergic inflammation. Basophils also promote the Th2 differentiation and enhance the humoral memory response. Thus, basophils are a key player in both immune regulation and allergic responses. Basophils and their products seem to be promising therapeutic targets for allergic disorders.Nippon rinsho. Japanese journal of clinical medicine 11/2009; 67(11):2095-9. -
Article: The study of allergy by Japanese researchers: a historical perspective.
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ABSTRACT: It has been over a hundred years since Shibasaburo Kitasato and Emil Adolf von Boehring's finding of a serum component that neutralizes bacterial toxins and the subsequent development of antiserum therapy. Over that time, many Japanese researchers have greatly contributed to our understanding of the molecular mechanisms for allergic and inflammatory diseases. This article is aimed at introducing such individual work and how these areas have contributed to our understanding of the mechanisms of allergic reactions.International Immunology 10/2009; 21(12):1311-6. · 3.41 Impact Factor -
Article: Basophils preferentially express mouse Mast Cell Protease 11 among the mast cell tryptase family in contrast to mast cells.
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ABSTRACT: Tryptases and chymases are the major proteins stored and secreted by mast cells, and they have various biological functions. However, the nature of proteases produced by basophils has been poorly characterized, particularly in mice. mMCP-11 is the most recently discovered mast cell tryptase in mice and was originally identified as Prss34, which is transcribed in some mast cell-like cell lines and at the early stage in the culture of BMMC with IL-3. Curiously, Prss34 is preferentially expressed in the BM and spleen among normal tissues in contrast to other mast cell tryptases. Therefore, it remains elusive what types of cells express mMCP-11 in vivo. Here, we show that mMCP-11 is highly expressed by primary basophils and to a much lesser extent, by some mast cells. Prss34 transcripts were detected abundantly in primary and cultured basophils and very weakly in peritoneal mast cells or cultured BMMC. Conversely, transcripts for mMCP-6 and mMCP-7 tryptases were preferentially expressed by cultured and peritoneal mast cells but not basophils. We established a mMCP-11-specific mAb and showed that mMCP-11 proteins are indeed expressed by primary basophils and those infiltrating the affected tissues during allergic inflammation and parasitic infections. Some primary mast cells also expressed mMCP-11 proteins, albeit at a much lower level. Thus, basophils rather than mast cells are the major source of mMCP-11. This is the first study to demonstrate that mouse basophils produce a trypsin-like protease.Journal of leukocyte biology 09/2009; 86(6):1417-25. · 4.99 Impact Factor -
Article: [An exciting new era of basophil research: newly discovered roles for basophils in acute and chronic allergic reactions].
Arerugī = [Allergy] 07/2009; 58(6):635-7. -
Article: Molecular explanation for the contradiction between systemic Th17 defect and localized bacterial infection in hyper-IgE syndrome.
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ABSTRACT: Hyper-IgE syndrome (HIES) is a primary immunodeficiency characterized by atopic manifestations and susceptibility to infections with extracellular pathogens, typically Staphylococcus aureus, which preferentially affect the skin and lung. Previous studies reported the defective differentiation of T helper 17 (Th17) cells in HIES patients caused by hypomorphic STAT3 mutations. However, the apparent contradiction between the systemic Th17 deficiency and the skin/lung-restricted susceptibility to staphylococcal infections remains puzzling. We present a possible molecular explanation for this enigmatic contradiction. HIES T cells showed impaired production of Th17 cytokines but normal production of classical proinflammatory cytokines including interleukin 1beta. Normal human keratinocytes and bronchial epithelial cells were deeply dependent on the synergistic action of Th17 cytokines and classical proinflammatory cytokines for their production of antistaphylococcal factors, including neutrophil-recruiting chemokines and antimicrobial peptides. In contrast, other cell types were efficiently stimulated with the classical proinflammatory cytokines alone to produce such factors. Accordingly, keratinocytes and bronchial epithelial cells, unlike other cell types, failed to produce antistaphylococcal factors in response to HIES T cell-derived cytokines. These results appear to explain, at least in part, why HIES patients suffer from recurrent staphylococcal infections confined to the skin and lung in contrast to more systemic infections in neutrophil-deficient patients.Journal of Experimental Medicine 07/2009; 206(6):1291-301. · 13.85 Impact Factor -
Article: New insights into the roles for basophils in acute and chronic allergy.
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ABSTRACT: Basophils represent less than 1% of peripheral blood leukocytes. They are often recruited to the site of allergic inflammation, albeit in small numbers. However, it remained uncertain whether basophils play any significant role in allergic reactions or act as minor and redundant 'circulating mast cells'. We have recently demonstrated that basophils play critical roles in systemic anaphylaxis and chronic allergic inflammation, distinctively from mast cells. Basophils are one of the major players in the IgG- but not IgE-mediated systemic anaphylaxis, in contrast to mast cells. In response to the allergen-IgG immune complexes, basophils release the platelet-activating factor rather than histamine as the major chemical mediator to induce the systemic anaphylaxis. The depletion of basophils protects mice from death due to anaphylactic shock. Basophils also play a crucial role in the development of the IgE-mediated chronic allergic inflammation with massive eosinophil infiltration in the skin, independently of T cells and mast cells, even though basophils account for only approximately 2% of the infiltrates. The basophil depletion shows a therapeutic effect on on-going allergic inflammation. Accumulating evidence suggests that basophils function as initiators rather than effectors of the chronic allergic inflammation. Thus, basophils and their products seem to be promising therapeutic targets for allergic disorders.Allergology International 02/2009; 58(1):11-9.
Top co-authors
Top Journals
Institutions
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2004–2013
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Tokyo Medical and Dental University
- Department of Immune Regulation
Tokyo, Tokyo-to, Japan
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2009
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Tohoku University
- Institute of Development, Aging and Cancer
Sendai-shi, Miyagi-ken, Japan
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2008
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Tokyo University and Graduate School of Social Welfare
Tokyo, Tokyo-to, Japan
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2003–2004
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National Research Institute for Child Health and Development
Tokyo, Tokyo-to, Japan -
Tokyo Metropolitan Institute of Medical Science
Tokyo, Tokyo-to, Japan
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