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Walkovich K. Understanding neutropenia secondary to intrinsic or iatrogenic immune dysregulation. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2021; 2021:504-513. [PMID: 34889406 PMCID: PMC8791120 DOI: 10.1182/hematology.2021000285] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
As a key member of the innate and adaptive immune response, neutrophils provide insights into the hematopoietic and inflammatory manifestations of inborn errors of immunity (IEI) and the consequences of immunotherapy. The facile recognition of IEI presenting with neutropenia provides an avenue for hematologists to facilitate early diagnosis and expedite biologically rationale care. Moreover, enhancing the understanding of the molecular mechanisms driving neutropenia in IEI-decreased bone marrow reserves, diminished egress from the bone marrow, and decreased survival-offers an opportunity to further dissect the pathophysiology driving neutropenia secondary to iatrogenic immune dysregulation, eg, immune checkpoint inhibitors and chimeric antigen receptor T-cell therapy.
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Affiliation(s)
- Kelly Walkovich
- Department of Pediatrics, University of Michigan, Ann Arbor, MI
- Correspondence Kelly Walkovich, Department of Pediatrics, University of Michigan, 1540 E Medical Center Dr, Ann Arbor, MI 48109; e-mail:
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2
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Sharma P, Nicoli ER, Serra-Vinardell J, Morimoto M, Toro C, Malicdan MCV, Introne WJ. Chediak-Higashi syndrome: a review of the past, present, and future. ACTA ACUST UNITED AC 2021; 31:31-36. [PMID: 33424983 DOI: 10.1016/j.ddmod.2019.10.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Since the initial description of Chediak-Higashi syndrome (CHS), over 75 years ago, several studies have been conducted to underscore the role of the lysosomal trafficking regulator (LYST) gene in the pathogenesis of disease. CHS is a rare autosomal recessive disorder, which is caused by biallelic mutations in the highly conserved LYST gene. The disease is characterized by partial oculocutaneous albinism, prolonged bleeding, immune and neurologic dysfunction, and risk for the development of hemophagocytic lympohistiocytosis (HLH). The presence of giant secretory granules in leukocytes is the classical diagnostic feature, which distinguishes CHS from closely related Griscelli and Hermansky-Pudlak syndromes. While the exact mechanism of the formation of the giant granules in CHS patients is not understood, dysregulation of LYST function in regulating lysosomal biogenesis has been proposed to play a role. In this review, we discuss the clinical characteristics of the disease and highlight the functional consequences of enlarged lysosomes and lysosome-related organelles (LROs) in CHS.
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Affiliation(s)
- Prashant Sharma
- Undiagnosed Diseases Program, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Elena-Raluca Nicoli
- Section of Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Jenny Serra-Vinardell
- Section of Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Marie Morimoto
- Undiagnosed Diseases Program, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Camilo Toro
- Undiagnosed Diseases Program, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.,Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - May Christine V Malicdan
- Undiagnosed Diseases Program, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.,Section of Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.,Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - Wendy J Introne
- Section of Human Biochemical Genetics, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.,Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
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3
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Gavillet M, Spertini O, Blum S. Pseudo Chediak-Higashi anomaly in blasts from acute lymphoblastic leukemia. Leuk Res 2018; 70:87-90. [PMID: 29906671 DOI: 10.1016/j.leukres.2018.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/05/2018] [Accepted: 06/06/2018] [Indexed: 10/14/2022]
Affiliation(s)
- M Gavillet
- Service and Central Laboratory of Hematology, CHUV, University Hospital of Lausanne, Lausanne, Switzerland.
| | - O Spertini
- Service and Central Laboratory of Hematology, CHUV, University Hospital of Lausanne, Lausanne, Switzerland
| | - S Blum
- Service and Central Laboratory of Hematology, CHUV, University Hospital of Lausanne, Lausanne, Switzerland
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4
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Gil-Krzewska A, Saeed MB, Oszmiana A, Fischer ER, Lagrue K, Gahl WA, Introne WJ, Coligan JE, Davis DM, Krzewski K. An actin cytoskeletal barrier inhibits lytic granule release from natural killer cells in patients with Chediak-Higashi syndrome. J Allergy Clin Immunol 2017; 142:914-927.e6. [PMID: 29241728 PMCID: PMC5995607 DOI: 10.1016/j.jaci.2017.10.040] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 09/21/2017] [Accepted: 10/26/2017] [Indexed: 11/30/2022]
Abstract
Background Chediak-Higashi syndrome (CHS) is a rare disorder caused by biallelic mutations in the lysosomal trafficking regulator gene (LYST), resulting in formation of giant lysosomes or lysosome-related organelles in several cell types. The disease is characterized by immunodeficiency and a fatal hemophagocytic lymphohistiocytosis caused by impaired function of cytotoxic lymphocytes, including natural killer (NK) cells. Objective We sought to determine the underlying biochemical cause of the impaired cytotoxicity of NK cells in patients with CHS. Methods We generated a human cell model of CHS using Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) technology. We used a combination of classical techniques to evaluate lysosomal function and cell activity in the model system and super-resolution microscopy to visualize F-actin and lytic granules in normal and LYST-deficient NK cells. Results Loss of LYST function in a human NK cell line, NK92mi, resulted in inhibition of NK cell cytotoxicity and reproduced other aspects of the CHS cellular phenotype, including the presence of significantly enlarged lytic granules with defective exocytosis and impaired integrity of endolysosomal compartments. The large granules had an acidic pH and normal activity of lysosomal enzymes and were positive for the proteins essential for lytic granule exocytosis. Visualization of the actin meshwork openings at the immunologic synapse revealed that the cortical actin acts as a barrier for secretion of such large granules at the cell-cell contact site. Decreasing the cortical actin density at the immunologic synapse or decreasing the lytic granule size restored the ability of LYST-deficient NK cells to degranulate and kill target cells. Conclusion The cortical actin and granule size play significant roles in NK cell cytotoxic function. We present evidence that the periodicity of subsynaptic actin is an important factor limiting the release of large lytic granules from NK cells from patients with CHS and could be a novel target for pharmaceutical intervention.
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Affiliation(s)
- Aleksandra Gil-Krzewska
- Receptor Cell Biology Section, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD
| | - Mezida B Saeed
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester, United Kingdom
| | - Anna Oszmiana
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester, United Kingdom
| | - Elizabeth R Fischer
- Electron Microscopy Unit, Research Technologies Branch, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Mont
| | - Kathryn Lagrue
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester, United Kingdom
| | - William A Gahl
- Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD
| | - Wendy J Introne
- Office of the Clinical Director, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD
| | - John E Coligan
- Receptor Cell Biology Section, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD
| | - Daniel M Davis
- Manchester Collaborative Centre for Inflammation Research, University of Manchester, Manchester, United Kingdom
| | - Konrad Krzewski
- Receptor Cell Biology Section, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD.
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Abstract
Granules are essential for the ability of neutrophils to fulfill their role in innate immunity. Granule membranes contain proteins that react to environmental cues directing neutrophils to sites of infection and initiate generation of bactericidal oxygen species. Granules are densely packed with proteins that contribute to microbial killing when liberated to the phagosome or extracellularly. Granules are, however, highly heterogeneous and are traditionally subdivided into azurophil granules, specific granules, and gelatinase granules in addition to secretory vesicles. This review will address issues pertinent to formation of granules, which is a process intimately connected to maturation of neutrophils from their precursors in the bone marrow. We further discuss possible mechanisms by which decisions are made regarding sorting of proteins to constitutive secretion or storage in granules and how degranulation of granule subsets is regulated.
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Affiliation(s)
- Jack B Cowland
- The Granulocyte Research Laboratory, Department of Hematology, National University Hospital, Copenhagen, Denmark
| | - Niels Borregaard
- The Granulocyte Research Laboratory, Department of Hematology, National University Hospital, Copenhagen, Denmark.,The University of Copenhagen, Copenhagen, Denmark
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6
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Leliefeld PHC, Wessels CM, Leenen LPH, Koenderman L, Pillay J. The role of neutrophils in immune dysfunction during severe inflammation. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2016; 20:73. [PMID: 27005275 PMCID: PMC4804478 DOI: 10.1186/s13054-016-1250-4] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Critically ill post-surgical, post-trauma and/or septic patients are characterised by severe inflammation. This immune response consists of both a pro- and an anti-inflammatory component. The pro-inflammatory component contributes to (multiple) organ failure whereas occurrence of immune paralysis predisposes to infections. Strikingly, infectious complications arise in these patients despite the presence of a clear neutrophilia. We propose that dysfunction of neutrophils potentially increases the susceptibility to infections or can result in the inability to clear existing infections. Under homeostatic conditions these effector cells of the innate immune system circulate in a quiescent state and serve as the first line of defence against invading pathogens. In severe inflammation, however, neutrophils are rapidly activated, which affects their functional capacities, such as chemotaxis, phagocytosis, intra-cellular killing, NETosis, and their capacity to modulate adaptive immunity. This review provides an overview of the current understanding of neutrophil dysfunction in severe inflammation. We will discuss the possible mechanisms of downregulation of anti-microbial function, suppression of adaptive immunity by neutrophils and the contribution of neutrophil subsets to immune paralysis.
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Affiliation(s)
- Pieter H C Leliefeld
- Department of Surgery, University Medical Center Utrecht, Utrecht, The Netherlands. .,Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands.
| | - Catharina M Wessels
- Department of Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Luke P H Leenen
- Department of Surgery, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Leo Koenderman
- Department of Respiratory Medicine, University Medical Center Utrecht, Utrecht, The Netherlands.,Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Janesh Pillay
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands.,Department of Anesthesiology and Critical Care, University Medical Center Utrecht, Utrecht, The Netherlands
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7
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Barrett A, Hermann GJ. A Caenorhabditis elegans Homologue of LYST Functions in Endosome and Lysosome-Related Organelle Biogenesis. Traffic 2016; 17:515-35. [PMID: 26822177 DOI: 10.1111/tra.12381] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 01/25/2016] [Accepted: 01/25/2016] [Indexed: 01/20/2023]
Abstract
LYST-1 is a Caenorhabditis elegans BEACH domain containing protein (BDCP) homologous to LYST and NBEAL2, BDCPs controlling organelle biogenesis that are implicated in human disease. Unlike the three other BDCPs encoded by C. elegans, mutations in lyst-1 lead to smaller lysosome-related organelles (LROs), smaller lysosomes, increased numbers of LROs and decreased numbers of early endosomes. lyst-1(-) mutations do not obviously disrupt protein trafficking to lysosomes or LROs, however, the formation of gut granules is diminished.
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Affiliation(s)
- Alec Barrett
- Department of Biology, Lewis & Clark College, 0615 SW Palatine Hill Rd., Portland, OR, 97219, USA
| | - Greg J Hermann
- Department of Biology, Lewis & Clark College, 0615 SW Palatine Hill Rd., Portland, OR, 97219, USA
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8
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Thaysen-Andersen M, Venkatakrishnan V, Loke I, Laurini C, Diestel S, Parker BL, Packer NH. Human neutrophils secrete bioactive paucimannosidic proteins from azurophilic granules into pathogen-infected sputum. J Biol Chem 2015; 290:8789-802. [PMID: 25645918 DOI: 10.1074/jbc.m114.631622] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Indexed: 01/09/2023] Open
Abstract
Unlike plants and invertebrates, mammals reportedly lack proteins displaying asparagine (N)-linked paucimannosylation (mannose(1-3)fucose(0-1)N-acetylglucosamine(2)Asn). Enabled by technology advancements in system-wide biomolecular characterization, we document that protein paucimannosylation is a significant host-derived molecular signature of neutrophil-rich sputum from pathogen-infected human lungs and is negligible in pathogen-free sputum. Five types of paucimannosidic N-glycans were carried by compartment-specific and inflammation-associated proteins of the azurophilic granules of human neutrophils including myeloperoxidase (MPO), azurocidin, and neutrophil elastase. The timely expressed human azurophilic granule-resident β-hexosaminidase A displayed the capacity to generate paucimannosidic N-glycans by trimming hybrid/complex type N-glycan intermediates with relative broad substrate specificity. Paucimannosidic N-glycoepitopes showed significant co-localization with β-hexosaminidase A and the azurophilic marker MPO in human neutrophils using immunocytochemistry. Furthermore, promyelocyte stage-specific expression of genes coding for paucimannosidic proteins and biosynthetic enzymes indicated a novel spatio-temporal biosynthetic route in early neutrophil maturation. The absence of bacterial exoglycosidase activities and paucimannosidic N-glycans excluded exogenous origins of paucimannosylation. Paucimannosidic proteins from isolated and sputum neutrophils were preferentially secreted upon inoculation with virulent Pseudomonas aeruginosa. Finally, paucimannosidic proteins displayed affinities to mannose-binding lectin, suggesting immune-related functions of paucimannosylation in activated human neutrophils. In conclusion, we are the first to document that human neutrophils produce, store and, upon activation, selectively secrete bioactive paucimannosidic proteins into sputum of lungs undergoing pathogen-based inflammation.
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Affiliation(s)
- Morten Thaysen-Andersen
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales-2109, Australia,
| | - Vignesh Venkatakrishnan
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales-2109, Australia
| | - Ian Loke
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales-2109, Australia
| | - Christine Laurini
- the Institute of Nutrition and Food Sciences, University of Bonn, Bonn 53113, Germany, and
| | - Simone Diestel
- the Institute of Nutrition and Food Sciences, University of Bonn, Bonn 53113, Germany, and
| | - Benjamin L Parker
- the Diabetes and Obesity Program, Garvan Institute of Medical Research, Sydney, New South Wales-2010, Australia
| | - Nicolle H Packer
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales-2109, Australia
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9
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Wang L, Kantovitz KR, Cullinane AR, Nociti FH, Foster BL, Roney JC, Tran AB, Introne WJ, Somerman MJ. Skin fibroblasts from individuals with Chediak-Higashi Syndrome (CHS) exhibit hyposensitive immunogenic response. Orphanet J Rare Dis 2014; 9:212. [PMID: 25528552 PMCID: PMC4296684 DOI: 10.1186/s13023-014-0212-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 12/10/2014] [Indexed: 01/10/2023] Open
Abstract
Background Chediak-Higashi Syndrome (CHS) is a rare autosomal recessive disease characterized by immunodeficiency, oculocutaneous albinism, neurological dysfunction, and early death. Individuals with CHS present with increased susceptibility to infections of the skin, upper-respiratory tract, gastrointestinal tract, and oral tissues. Classical CHS is caused by mutations in the gene encoding lysosomal trafficking regulator (LYST). Although defects in cytotoxic T cell lytic secretory granule secretion and neutrophil phagocytosis are suggested to contribute to the immunodeficiency in CHS, the underlying molecular mechanisms are unknown. We hypothesized that skin fibroblasts from CHS subjects exhibit impaired immune response due to defective trafficking of inflammatory factors. Methods and results Primary skin fibroblasts from CHS subjects or healthy controls were assessed for genes encoding inflammatory response factors using PCR array. At baseline, we found CD14, IL1R1 and TLR-1 were down-regulated significantly (≥2 fold change) and the genes encoding TLR-3, IL-1β and IL-6 were up-regulated in CHS cells compared to control cells. When challenged with E. coli lipopolysaccharide (LPS), CHS cells were less responsive than control cells, with only 8 genes significantly up-regulated (3–68 fold change) compared to baseline values, whereas 28 genes in control cells were significantly up-regulated at a much higher magnitude (3–4,629 fold change). In addition, 50% of the genes significantly up-regulated in LPS-treated control cells were significantly lower in LPS-treated CHS cells. IL-6, a fibroblast-derived proinflammatory cytokine essential for fighting infections was significantly lower in culture media of CHS cells with or without LPS. Furthermore, Western blot and immunofluorescent staining revealed that TLR-2 and TLR-4 were diminished on cell membranes of CHS cells and dissociated from Rab11a. Conclusions For the first time, results from our study indicate defective trafficking of TLR-2 and TLR-4 contributes to the hyposensitive response of CHS skin fibroblasts to immunogenic challenge, providing a potential therapeutic target for clinical intervention in CHS.
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Affiliation(s)
- Le Wang
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA.
| | - Kamila Rosamilia Kantovitz
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA. .,University of Campinas - Piracicaba Dental School, Piracicaba, Sao Paulo, Brazil.
| | | | - Francisco Humberto Nociti
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA. .,University of Campinas - Piracicaba Dental School, Piracicaba, Sao Paulo, Brazil.
| | - Brian Lee Foster
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA.
| | | | - Anne Bich Tran
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA.
| | | | - Martha Joan Somerman
- NIH/NIAMS - National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, USA.
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10
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Abstract
Neutrophil granulocytes are key effector cells of the vertebrate immune system. They represent 50-70% of the leukocytes in the human blood and their loss by disease or drug side effect causes devastating bacterial infections. Their high turnover rate, their fine-tuned killing machinery, and their arsenal of toxic vesicles leave them particularly vulnerable to various genetic deficiencies. The aim of this review is to highlight those congenital immunodeficiencies which impede the dynamics of neutrophils, such as migration, cytoskeletal rearrangements, vesicular trafficking, and secretion.
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11
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Bouatay A, Hizem S, Tej A, Moatamri W, Boughamoura L, Kortas M. Chediak-higashi syndrome presented as accelerated phase: case report and review of the literature. Indian J Hematol Blood Transfus 2014; 30:223-6. [PMID: 25332584 DOI: 10.1007/s12288-014-0336-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 01/13/2014] [Indexed: 12/01/2022] Open
Abstract
Chediak-Higashi syndrome (CHS) is a rare autosomal recessive disease, characterized by partial oculocutaneous albinism, recurrent pyogenic infections (skin, mucosa and respiratory system), and neurologic deficit. The hallmark of this syndrome is the presence of abnormal intracytoplasmic giant granules in all granule containing cells including leukocytes in blood and bone marrow. A majority (85 %) of patients with CHS develop an accelerated phase consisting of a lymphoproliferative syndrome with hemophagocytosis and infiltration of most tissues. This phase is characterized by fever, jaundice, hepatosplenomegaly, lymphadenopathy, pancytopenia and neurological abnormalities. In this paper, we report a case of CHS presented as accelerated phase in a 9-month-old girl child.
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Affiliation(s)
- Amina Bouatay
- Haematology's Laboratory, University Hospital Farhat Hached, Avenue Ibn Jazzar, 4000 Sousse, Tunisia
| | - Sondes Hizem
- Haematology's Laboratory, University Hospital Farhat Hached, Avenue Ibn Jazzar, 4000 Sousse, Tunisia
| | - Amel Tej
- Department of Pediatric, University Hospital Farhat Hached, 4000 Sousse, Tunisia
| | - Wided Moatamri
- Haematology's Laboratory, University Hospital Farhat Hached, Avenue Ibn Jazzar, 4000 Sousse, Tunisia
| | - Lamia Boughamoura
- Department of Pediatric, University Hospital Farhat Hached, 4000 Sousse, Tunisia
| | - Mondher Kortas
- Haematology's Laboratory, University Hospital Farhat Hached, Avenue Ibn Jazzar, 4000 Sousse, Tunisia
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12
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Dotta L, Parolini S, Prandini A, Tabellini G, Antolini M, Kingsmore SF, Badolato R. Clinical, laboratory and molecular signs of immunodeficiency in patients with partial oculo-cutaneous albinism. Orphanet J Rare Dis 2013; 8:168. [PMID: 24134793 PMCID: PMC3856608 DOI: 10.1186/1750-1172-8-168] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Accepted: 10/11/2013] [Indexed: 01/04/2023] Open
Abstract
Hypopigmentation disorders that are associated with immunodeficiency feature both partial albinism of hair, skin and eyes together with leukocyte defects. These disorders include Chediak Higashi (CHS), Griscelli (GS), Hermansky-Pudlak (HPS) and MAPBP-interacting protein deficiency syndromes. These are heterogeneous autosomal recessive conditions in which the causal genes encode proteins with specific roles in the biogenesis, function and trafficking of secretory lysosomes. In certain specialized cells, these organelles serve as a storage compartment. Impaired secretion of specific effector proteins from that intracellular compartment affects biological activities. In particular, these intracellular granules are essential constituents of melanocytes, platelets, granulocytes, cytotoxic T lymphocytes (CTLs) and natural killer (NK) cells. Thus, abnormalities affect pigmentation, primary hemostasis, blood cell counts and lymphocyte cytotoxic activity against microbial pathogens. Among eight genetically distinct types of HPS, only type 2 is characterized by immunodeficiency. Recently, a new subtype, HPS9, was defined in patients presenting with immunodeficiency and oculocutaneous albinism, associated with mutations in the pallidin-encoding gene, PLDN.Hypopigmentation together with recurrent childhood bacterial or viral infections suggests syndromic albinism. T and NK cell cytotoxicity are generally impaired in patients with these disorders. Specific clinical and biochemical phenotypes can allow differential diagnoses among these disorders before molecular testing. Ocular symptoms, including nystagmus, that are usually evident at birth, are common in patients with HPS2 or CHS. Albinism with short stature is unique to MAPBP-interacting protein (MAPBPIP) deficiency, while hemophagocytic lymphohistiocytosis (HLH) mainly suggests a diagnosis of CHS or GS type 2 (GS2). Neurological disease is a long-term complication of CHS, but is uncommon in other syndromic albinism. Chronic neutropenia is a feature of HPS2 and MAPBPIP-deficiency syndrome, whereas it is usually transient in CHS and GS2. In every patient, an accurate diagnosis is required for prompt and appropriate treatment, particularly in patients who develop HLH or in whom bone marrow transplant is required. This review describes the molecular and pathogenetic mechanisms of these diseases, focusing on clinical and biochemical aspects that allow early differential diagnosis.
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Affiliation(s)
- Laura Dotta
- Department of Experimental and Clinical Sciences, Institute of Molecular Medicine “Angelo Nocivelli”, University of Brescia, Brescia, Italy
| | - Silvia Parolini
- Department of Molecular and Translational Medicine, University of Brescia, Brescia 25123, Italy
| | - Alberto Prandini
- Department of Experimental and Clinical Sciences, Institute of Molecular Medicine “Angelo Nocivelli”, University of Brescia, Brescia, Italy
| | - Giovanna Tabellini
- Department of Molecular and Translational Medicine, University of Brescia, Brescia 25123, Italy
| | - Maddalena Antolini
- Department of Experimental and Clinical Sciences, Institute of Molecular Medicine “Angelo Nocivelli”, University of Brescia, Brescia, Italy
| | - Stephen F Kingsmore
- Center for Pediatric Genomic Medicine, Children’s Mercy Hospital, Kansas City, MO 64108, USA
| | - Raffaele Badolato
- Department of Experimental and Clinical Sciences, Institute of Molecular Medicine “Angelo Nocivelli”, University of Brescia, Brescia, Italy
- Istituto di Medicina Molecolare “Angelo Nocivelli”, Universita' di Brescia, c/o Spedali Civili, Brescia 25123, Italy
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13
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Soehnlein O, Wantha S, Simsekyilmaz S, Döring Y, Megens RTA, Mause SF, Drechsler M, Smeets R, Weinandy S, Schreiber F, Gries T, Jockenhoevel S, Möller M, Vijayan S, van Zandvoort MAMJ, Agerberth B, Pham CT, Gallo RL, Hackeng TM, Liehn EA, Zernecke A, Klee D, Weber C. Neutrophil-derived cathelicidin protects from neointimal hyperplasia. Sci Transl Med 2012; 3:103ra98. [PMID: 21974936 DOI: 10.1126/scitranslmed.3002531] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Percutaneous transluminal angioplasty with stent implantation is used to dilate arteries narrowed by atherosclerotic plaques and to revascularize coronary arteries occluded by atherothrombosis in myocardial infarction. Commonly applied drug-eluting stents release antiproliferative or anti-inflammatory agents to reduce the incidence of in-stent stenosis. However, these stents may still lead to in-stent stenosis; they also show increased rates of late stent thrombosis, an obstacle to optimal revascularization possibly related to endothelial recovery. Here, we examined the contribution of neutrophils and neutrophilic granule proteins to arterial healing after injury. We found that neutrophil-borne cathelicidin (mouse CRAMP, human LL-37) promoted reendothelization and thereby limited neointima formation after stent implantation. We then translated these findings to an animal model using a neutrophil-instructing, biofunctionalized, miniaturized Nitinol stent coated with LL-37. This stent reduced in-stent stenosis in a mouse model of atherosclerosis, suggesting that LL-37 may promote vascular healing after interventional therapy.
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Affiliation(s)
- Oliver Soehnlein
- Institute for Cardiovascular Prevention, Ludwig-Maximilians University München, Munich 80336, Germany.
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14
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Ortuño FJ, Fuster JL, Jerez A. [Chediak-Higashi syndrome]. Med Clin (Barc) 2010; 135:512-8. [PMID: 20044107 DOI: 10.1016/j.medcli.2009.11.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 10/29/2009] [Accepted: 11/05/2009] [Indexed: 11/29/2022]
Affiliation(s)
- Francisco José Ortuño
- Servicio de Hematología y Oncología Médica, Hospital Universitario JM Morales Meseguer, Murcia, España.
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15
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Soehnlein O, Weber C, Lindbom L. Neutrophil granule proteins tune monocytic cell function. Trends Immunol 2009; 30:538-46. [PMID: 19699683 DOI: 10.1016/j.it.2009.06.006] [Citation(s) in RCA: 126] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 06/26/2009] [Accepted: 06/26/2009] [Indexed: 12/18/2022]
Abstract
Polymorphonuclear leukocytes (PMNs) release the contents of granules during their migration to inflammatory sites. On liberation from the first leukocyte to enter injured tissue, the granule proteins play a central role in the early inflammatory response. In particular, mononuclear phagocytes interact intimately with PMNs and their secretion products. PMN granule proteins enhance the adhesion of monocytes to the endothelium and stimulate subsequent extravasation of inflammatory monocytes. At the site of inflammation, PMN granule proteins activate macrophages to produce and release cytokines and to phagocytose IgG-opsonized bacteria. Furthermore, by direct cell-cell contacts, PMNs activate monocyte-derived dendritic cells, thereby enhancing antigen presentation. Efforts in this field might lead to the development of drugs for specific modulation of innate immune functions.
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Affiliation(s)
- Oliver Soehnlein
- Institute of Molecular Cardiovascular Research, University Hospital, RWTH Aachen University, Aachen, Germany.
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16
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Huizing M, Helip-Wooley A, Westbroek W, Gunay-Aygun M, Gahl WA. Disorders of lysosome-related organelle biogenesis: clinical and molecular genetics. Annu Rev Genomics Hum Genet 2008; 9:359-86. [PMID: 18544035 DOI: 10.1146/annurev.genom.9.081307.164303] [Citation(s) in RCA: 274] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Lysosome-related organelles (LROs) are a heterogeneous group of vesicles that share various features with lysosomes, but are distinct in function, morphology, and composition. The biogenesis of LROs employs a common machinery, and genetic defects in this machinery can affect all LROs or only an individual LRO, resulting in a variety of clinical features. In this review, we discuss the main components of LRO biogenesis. We also summarize the function, composition, and resident cell types of the major LROs. Finally, we describe the clinical characteristics of the major human LRO disorders.
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Affiliation(s)
- Marjan Huizing
- Cell Biology of Metabolic Disorders Unit, National Institutes of Health, Bethesda, Maryland 20892, USA.
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17
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Genetic heterogeneity in severe congenital neutropenia: how many aberrant pathways can kill a neutrophil? Curr Opin Allergy Clin Immunol 2008; 7:481-94. [PMID: 17989524 DOI: 10.1097/aci.0b013e3282f1d690] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE OF REVIEW Severe congenital neutropenia is a primary immunodeficiency in which lack of neutrophils causes inadequate innate immune host response to bacterial infections. Severe congenital neutropenia occurs with sporadic, autosomal dominant, autosomal recessive and X-linked recessive inheritance, as well as in a variety of multisystem syndromes. A principal stimulus for this review is the identification of novel genetic defects and pathophysiological insights into the role of neutrophil apoptosis. RECENT FINDINGS The recent findings include identification of mutations in HAX1 in autosomal recessive severe congenital neutropenia (Kostmann disease), a large epidemiological study estimating the risk of progression from severe congenital neutropenia to leukemia, a better understanding of how heterozygous mutations in neutrophil elastase (ELA2) cause severe congenital neutropenia, molecular characterization of a novel syndromic form of severe congenital neutropenia called p14 deficiency and new animal models for several syndromic forms of severe congenital neutropenia. SUMMARY We consider the numerous genes mutated in severe congenital neutropenia, the many attempts to make animal models of severe congenital neutropenia, and the results from both human and mouse studies investigating the molecular mechanisms of neutrophil apoptosis. Investigations of how severe congenital neutropenia genes and apoptosis pathways are connected should lead to a better understanding of the pathogenesis of neutropenia and apoptosis pathways relevant to many cell types.
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Abstract
Neutrophils are critical components of the innate immune response, and persistent neutropenia is associated with a marked susceptibility to infection. There are a number of inherited clinical syndromes in which neutropenia is a prominent feature. A study of these rare disorders has provided insight into the mechanisms regulating normal neutrophil homeostasis. Tremendous progress has been made at defining the genetic basis of these disorders. Herein, progress in understanding the genetic basis and molecular mechanisms of these disorders is discussed. We have focused our discussion on inherited disorders in which neutropenia is the sole or major hematopoietic defect.
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Affiliation(s)
- David S Grenda
- Division of Oncology, Washington University School of Medicine, Saint Louis, MO 63110, USA
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20
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Dhaunsi GS. Molecular mechanisms of organelle biogenesis and related metabolic diseases. Med Princ Pract 2005; 14 Suppl 1:49-57. [PMID: 16103713 DOI: 10.1159/000086184] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2004] [Accepted: 12/21/2004] [Indexed: 11/19/2022] Open
Abstract
Organelle biogenesis is regulated by transcriptional networks that modulate expression of specific genes encoding organellar proteins. Structural and functional specificity of organelles requires not only the transcription of specific genes and translation of resulting mRNAs, but also the transfer of encoded polypeptides to their site of function through signaling peptides. A defect in targeting of proteins to their subcellular site of function may not necessarily prevent biogenesis of the organelle, but would definitely lead to formation of a defective organelle with respect to that specific function. Several metabolic diseases are associated with dysfunction or defects in organelle biogenesis; among these, peroxisome biogenesis disorders, mitochondrial biogenesis defects and lysosomal storage disorders are an extensively studied group of genetic diseases where biogenesis of the organelle is compromised either due to a defect in assembly of the organelle itself or impaired import of matrix proteins into the organelle. Recent advances in biochemical and molecular aspects of biogenesis of subcellular organelles have not only unraveled the mechanisms for organization of cellular networks, but have also provided new insights into the development of metabolic diseases that are caused by disruption of organelle biogenesis. This article reviews the molecular mechanisms of biogenesis of mitochondria, lysosomes and peroxisomes in relation to the metabolic diseases of genetic or nongenetic origin.
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Affiliation(s)
- Gursev S Dhaunsi
- Department of Pediatrics, Faculty of Medicine, Kuwait University, Kuwait.
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21
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Anikster Y, Huizing M, Anderson PD, Fitzpatrick DL, Klar A, Gross-Kieselstein E, Berkun Y, Shazberg G, Gahl WA, Hurvitz H. Evidence that Griscelli syndrome with neurological involvement is caused by mutations in RAB27A, not MYO5A. Am J Hum Genet 2002; 71:407-14. [PMID: 12058346 PMCID: PMC379173 DOI: 10.1086/341606] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2002] [Accepted: 05/06/2002] [Indexed: 11/03/2022] Open
Abstract
Griscelli syndrome (GS), a rare autosomal recessive disorder, is characterized by partial albinism, along with immunologic abnormalities or severe neurological impairment or both. Mutations in one of two different genes on chromosome 15q can cause the different subtypes of GS. Most patients with GS display the hemophagocytic syndrome and have mutations in RAB27A, which codes for a small GTPase. Two patients with neurological involvement have mutations in MYO5A, which codes for an actin-based molecular motor. The RAB27A and MYO5A gene products interact with each other and function in vesicle trafficking. We report the molecular basis of GS in a Muslim Arab kindred whose members have extremely variable neurological involvement, along with the hemophagocytic syndrome and immunologic abnormalities. The patients have normal MYO5A genes but exhibit a homozygous 67.5-kb deletion that eliminates RAB27A mRNA and immunocytofluorescence-detectable protein. We also describe the molecular organization of RAB27A and a multiplex polymerase chain reaction assay for the founder deletion in this kindred. Finally, we propose that all patients with GS have RAB27A mutations and immunologic abnormalities that sometimes result in secondary neurological involvement. The two patients described elsewhere who have MYO5A mutations and neurological complications but no immunologic defects may not have GS but instead may have Elejalde syndrome, a condition characterized by mild hypopigmentation and severe, primary neurological abnormalities.
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Affiliation(s)
- Yair Anikster
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Marjan Huizing
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Paul D. Anderson
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Diana L. Fitzpatrick
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Aharon Klar
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Eva Gross-Kieselstein
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Yackov Berkun
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Gila Shazberg
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - William A. Gahl
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
| | - Haggit Hurvitz
- Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda; and Department of Pediatrics, Bikur Cholim General Hospital and Hebrew University–Hadassah Medical School, Jerusalem
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Gonçalves AS, Appelberg R. Effects of recombinant granulocyte-colony stimulating factor administration during Mycobacterium avium infection in mice. Clin Exp Immunol 2001; 124:239-47. [PMID: 11422200 PMCID: PMC1906052 DOI: 10.1046/j.1365-2249.2001.01552.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2000] [Indexed: 11/20/2022] Open
Abstract
Granulocyte colony-stimulating factor (G-CSF) administration in vivo has been shown to improve the defence mechanisms against infection by different microbes. Here we evaluated a possible protective role of this molecule in a mouse model of mycobacterial infection. The administration of recombinant G-CSF promoted an extensive blood neutrophilia but failed to improve the course of Mycobacterium avium infection in C57Bl/6 or beige mice. G-CSF administration also failed to improve the efficacy of a triple chemotherapeutic regimen (clarithromycin + ethambutol + rifabutin). G-CSF treatment did not protect interleukin-10 gene disrupted mice infected with M. avium. Spleen cells from infected mice treated with G-CSF had a decreased priming for antigen-specific production of interferon gamma compared to control infected mice. Our data do not substantiate previous reports on the protective activity of G-CSF in antimycobacterial immunity using mouse models.
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Affiliation(s)
- A S Gonçalves
- Laboratory of Microbiology and Immunology of Infection, Institute for Molecular and Cell Biology, University of Porto, Portugal
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Islam AS, Hawsawi ZM, Islam MS, Ibrahim OA. Chédiak-Higashi syndrome: an accelerated phase with hereditary elliptocytosis: case report and review of the literature. Ann Saudi Med 2001; 21:221-4. [PMID: 17264559 DOI: 10.5144/0256-4947.2001.221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- A S Islam
- Department of Pathology and Pediatrics, Maternity and Children's Hospital, Madina, Saudi Arabia
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Abstract
Rare hereditary deficiencies have been described which affect each functional stage of polymorphonuclear neutrophils. They almost invariably lead to recurrent acute infection. Among the abnormalities involving adhesion and motility, the following can be noted: the Buckley syndrome; and leucocyte type 1 and 2 adhesion deficiencies, respectively caused by a deficiency in membrane expression of beta 2 integrin CD11/CD18, and sialyl lewis X. Granulation system abnormalities include relatively non-symptomatic myeloperoxidase deficiency, specific granulation deficiency or the Chediak-Higashi syndrome with the presence of giant lysosomal granulations. Chronic or familial septic granulomatosis constitutes the main disease described due to the oxidative PMN burst connected with the functional impairment of one of the constituents of NADPH oxidase (with an incidence of one in 5.10(6) to one in 10(6) births) The transmission is X-linked, or autosomal recessive depending on the mutation. The antenatal detection of the X-linked component, gp91 phox, can be made in suspected carrier mothers. In addition to the standard treatment (Bactrim and Itraconazole), bone marrow transplantation may also be carried out, and in future gene therapy may be introduced.
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Affiliation(s)
- S Chollet-Martin
- Service d'hématologie et d'immunologie biologiques et Inserm U479, CHU Bichat-Claude-Bernard, 46, rue Henri-Huchard, 75018 Paris, France
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Abstract
Hermansky-Pudlak syndrome (HPS) consists of a group of genetically heterogeneous disorders which share the clinical findings of oculocutaneous albinism, a platelet storage pool deficiency, and some degree of ceroid lipofuscinosis. Related diseases share some of these findings and may exhibit other symptoms and signs but the underlying defect in the entire group of disorders involves defective intracellular vesicle formation, transport or fusion. Two HPS-causing genes, HPS1 and ADTB3A, have been isolated but the function of only the latter has been determined. ADTB3A codes for the beta 3A subunit of adaptor complex-3, responsible for vesicle formation from the trans-Golgi network (TGN). The many HPS patients who do not have HPS1 or ADTB3A mutations have their disease because of mutations in other genes. Candidates for these HPS-causing genes include those responsible for mouse models of HPS or for the 'granule' group of eye color genes in Drosophila. Each gene responsible for a subset of HPS or a related disorder codes for a protein which almost certainly plays a pivotal role in vesicular trafficking, inextricably linking clinical and cell biological interests in this group of diseases.
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Affiliation(s)
- M Huizing
- Section on Human Biochemical Genetics, Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
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Affiliation(s)
- Esteban C. Dell'Angelica
- Cell Biology and Metabolism BranchNational Institute of Child Health and Human DevelopmentNational Institutes of Health Bethesda Maryland 20892‐5430 USA
| | - Chris Mullins
- Cell Biology and Metabolism BranchNational Institute of Child Health and Human DevelopmentNational Institutes of Health Bethesda Maryland 20892‐5430 USA
| | - Steve Caplan
- Cell Biology and Metabolism BranchNational Institute of Child Health and Human DevelopmentNational Institutes of Health Bethesda Maryland 20892‐5430 USA
| | - Juan S. Bonifacino
- Cell Biology and Metabolism BranchNational Institute of Child Health and Human DevelopmentNational Institutes of Health Bethesda Maryland 20892‐5430 USA
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Introne W, Boissy RE, Gahl WA. Clinical, molecular, and cell biological aspects of Chediak-Higashi syndrome. Mol Genet Metab 1999; 68:283-303. [PMID: 10527680 DOI: 10.1006/mgme.1999.2927] [Citation(s) in RCA: 201] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Chediak-Higashi syndrome (CHS) is a rare autosomal recessive disorder characterized by variable degrees of oculocutaneous albinism, easy bruisability, and bleeding as a result of deficient platelet dense bodies, and recurrent infections, with neutropenia, impaired chemotaxis and bactericidal activity, and abnormal NK cell function. Neurologic involvement is variable, but often includes peripheral neuropathy. Most patients also undergo an "accelerated phase," which is a nonmalignant lymphohistiocytic infiltration of multiple organs resembling lymphoma. Death often occurs in the first decade from infection, bleeding, or development of the accelerated phase. The hallmark of CHS is the presence of huge cytoplasmic granules in circulating granulocytes and many other cell types. These granules are peroxidase-positive and contain lysosomal enzymes, suggesting that they are giant lysosomes or, in the case of melanocytes, giant melanosomes. The underlying defect in CHS remains elusive, but the disorder can be considered a model for defects in vesicle formation, fusion, or trafficking. Because the beige mouse demonstrates many characteristics similar to those of human CHS patients, including dilution of coat color, recurrent infections, and the presence of giant granules, it is considered the animal homologue of CHS. The beige gene, Lyst, was mapped and sequenced in 1996, prompting identification of the human LYST gene on chromosome 1q42. Lyst and LYST show 86.5% sequence homology. LYST encodes a 429 kDa protein with a function that remains unknown, but the source of extensive speculation among students of cell biology.
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Affiliation(s)
- W Introne
- Heritable Disorders Branch, National Institutes of Health, Bethesda, Maryland
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