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Benz C, Ali M, Krystkowiak I, Simonetti L, Sayadi A, Mihalic F, Kliche J, Andersson E, Jemth P, Davey NE, Ivarsson Y. Proteome-scale mapping of binding sites in the unstructured regions of the human proteome. Mol Syst Biol 2022; 18:e10584. [PMID: 35044719 PMCID: PMC8769072 DOI: 10.15252/msb.202110584] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 12/21/2021] [Accepted: 12/22/2021] [Indexed: 12/18/2022] Open
Abstract
Specific protein-protein interactions are central to all processes that underlie cell physiology. Numerous studies have together identified hundreds of thousands of human protein-protein interactions. However, many interactions remain to be discovered, and low affinity, conditional, and cell type-specific interactions are likely to be disproportionately underrepresented. Here, we describe an optimized proteomic peptide-phage display library that tiles all disordered regions of the human proteome and allows the screening of ~ 1,000,000 overlapping peptides in a single binding assay. We define guidelines for processing, filtering, and ranking the results and provide PepTools, a toolkit to annotate the identified hits. We uncovered >2,000 interaction pairs for 35 known short linear motif (SLiM)-binding domains and confirmed the quality of the produced data by complementary biophysical or cell-based assays. Finally, we show how the amino acid resolution-binding site information can be used to pinpoint functionally important disease mutations and phosphorylation events in intrinsically disordered regions of the proteome. The optimized human disorderome library paired with PepTools represents a powerful pipeline for unbiased proteome-wide discovery of SLiM-based interactions.
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Affiliation(s)
- Caroline Benz
- Department of Chemistry ‐ BMCUppsala UniversityUppsalaSweden
| | - Muhammad Ali
- Department of Chemistry ‐ BMCUppsala UniversityUppsalaSweden
| | | | | | - Ahmed Sayadi
- Department of Chemistry ‐ BMCUppsala UniversityUppsalaSweden
| | - Filip Mihalic
- Department of Medical Biochemistry and MicrobiologyUppsala UniversityUppsalaSweden
| | - Johanna Kliche
- Department of Chemistry ‐ BMCUppsala UniversityUppsalaSweden
| | - Eva Andersson
- Department of Medical Biochemistry and MicrobiologyUppsala UniversityUppsalaSweden
| | - Per Jemth
- Department of Medical Biochemistry and MicrobiologyUppsala UniversityUppsalaSweden
| | - Norman E Davey
- Division of Cancer BiologyThe Institute of Cancer ResearchLondonUK
| | - Ylva Ivarsson
- Department of Chemistry ‐ BMCUppsala UniversityUppsalaSweden
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2
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Schreuder WH, van der Wal JE, de Lange J, van den Berg H. Multiple versus solitary giant cell lesions of the jaw: Similar or distinct entities? Bone 2021; 149:115935. [PMID: 33771761 DOI: 10.1016/j.bone.2021.115935] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 02/27/2021] [Accepted: 03/17/2021] [Indexed: 02/06/2023]
Abstract
The majority of giant cell lesions of the jaw present as a solitary focus of disease in bones of the maxillofacial skeleton. Less frequently they occur as multifocal lesions. This raises the clinical dilemma if these should be considered distinct entities and therefore each need a specific therapeutic approach. Solitary giant cell lesions of the jaw present with a great diversity of symptoms. Recent molecular analysis revealed that these are associated with somatic gain-of-function mutations in KRAS, FGFR1 or TRPV4 in a large component of the mononuclear stromal cells which all act on the RAS/MAPK pathway. For multifocal lesions, a small group of neoplastic multifocal giant cell lesions of the jaw remain after ruling out hyperparathyroidism. Strikingly, most of these patients are diagnosed with jaw lesions before the age of 20 years, thus before the completion of dental and jaw development. These multifocal lesions are often accompanied by a diagnosis or strong clinical suspicion of a syndrome. Many of the frequently reported syndromes belong to the so-called RASopathies, with germline or mosaic mutations leading to downstream upregulation of the RAS/MAPK pathway. The other frequently reported syndrome is cherubism, with gain-of-function mutations in the SH3BP2 gene leading through assumed and unknown signaling to an autoinflammatory bone disorder with hyperactive osteoclasts and defective osteoblastogenesis. Based on this extensive literature review, a RAS/MAPK pathway activation is hypothesized in all giant cell lesions of the jaw. The different interaction between and contribution of deregulated signaling in individual cell lineages and crosstalk with other pathways among the different germline- and non-germline-based alterations causing giant cell lesions of the jaw can be explanatory for the characteristic clinical features. As such, this might also aid in the understanding of the age-dependent symptomatology of syndrome associated giant cell lesions of the jaw; hopefully guiding ideal timing when installing treatment strategies in the future.
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Affiliation(s)
- Willem H Schreuder
- Department of Oral and Maxillofacial Surgery, Amsterdam UMC and Academic Center for Dentistry Amsterdam, University of Amsterdam, Amsterdam, the Netherlands; Department of Head and Neck Surgery and Oncology, Antoni van Leeuwenhoek / Netherlands Cancer Institute, Amsterdam, the Netherlands.
| | - Jacqueline E van der Wal
- Department of Pathology, Antoni van Leeuwenhoek / Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Jan de Lange
- Department of Oral and Maxillofacial Surgery, Amsterdam UMC and Academic Center for Dentistry Amsterdam, University of Amsterdam, Amsterdam, the Netherlands
| | - Henk van den Berg
- Department of Pediatrics / Oncology, Amsterdam UMC, University of Amsterdam, Emma Children's Hospital, Amsterdam, the Netherlands
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3
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Cherubism: a systematic literature review of clinical and molecular aspects. Int J Oral Maxillofac Surg 2020; 50:43-53. [PMID: 32620450 DOI: 10.1016/j.ijom.2020.05.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 05/10/2020] [Indexed: 12/13/2022]
Abstract
The purpose of this review was to integrate the clinical, radiological, microscopic, and molecular data of published cherubism cases, in addition to therapeutic approaches, to provide more concise information about the disease. An electronic search was undertaken in September 2019. Eligibility criteria included publications having enough clinical, radiological, and histological information to confirm the diagnosis. A total of 260 publications reporting 513 cherubism cases were included. Familial history was observed in 310/458 cases (67.7%). SH3BP2 mutations were reported in 101/108 cases (93.5%) and mainly occurred at protein residues 415, 418, 419, and 420. Retrospective clinical grading was possible in 175 cases. Advanced clinical grading was associated with tooth agenesis, but not with other clinical, radiological, and genetic features. Specific amino acid substitutions of SH3BP2 mutations were not associated with the clinical grading of the disease. 'Wait and see' was the most common therapeutic approach. In a small number of cases, drugs were used in the treatment, with variable response. In conclusion, there is no clear correlation between the genotype and the phenotype of the disease, but additional genomic and gene expression regulation information is necessary for a better understanding of cherubism.
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4
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Vivelo CA, Ayyappan V, Leung AKL. Poly(ADP-ribose)-dependent ubiquitination and its clinical implications. Biochem Pharmacol 2019; 167:3-12. [PMID: 31077644 PMCID: PMC6702056 DOI: 10.1016/j.bcp.2019.05.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 05/04/2019] [Indexed: 12/11/2022]
Abstract
ADP-ribosylation-the addition of one or multiple ADP-ribose units onto proteins-is a therapeutically important post-translational modification implicated in cancer, neurodegeneration, and infectious diseases. The protein modification regulates a broad range of biological processes, including DNA repair, transcription, RNA metabolism, and the structural integrity of nonmembranous structures. The polymeric form of ADP-ribose, poly(ADP-ribose), was recently identified as a signal for triggering protein degradation through the ubiquitin-proteasome system. Using informatics analyses, we found that these ubiquitinated substrates tend to be low abundance proteins, which may serve as rate-limiting factors within signaling networks or metabolic processes. In this review, we summarize the current literature on poly(ADP-ribose)-dependent ubiquitination (PARdU) regarding its biological mechanisms, substrates, and relevance to diseases.
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Affiliation(s)
- Christina A Vivelo
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Vinay Ayyappan
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Anthony K L Leung
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA; Department of Molecular Biology and Genetics, School of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Oncology, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
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5
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Abstract
Cherubism is an uncommon hereditary benign fibro-osseous disorder characterized by bilateral enlargement of the mandible and the maxilla that presents with varying degrees of involvement and a tendency toward spontaneous remission.The first visit was in 2002. A 16-year-old female was referred to an orthodontist for correction of her dental crowding. In the radiographic examination that was taken for her treatment the first time in 2002, a jaw bone lesion was discovered accidentally. X-ray panoramic imaging revealed well-defined multilocular radiolucencies involving the posterior body of the mandible and ascending rami with displaced teeth. This lesion had no effect on inferior alveolar canal and maxilla.There was no significant past medical history, and there was no family history suggestive of a similar complaint. On extraoral examination, there was no swelling in both rami of the mandible and face. Histopathological examination of the biopsy specimen showed proliferating fibrous connective tissue interspersed by multinucleated giant cells. It was diagnosed as a case nonfamilial cherubism. An extensive long-term follow-up till 12 years was maintained. In 2014, after 12-years follow-up for this lesion, panoramic imaging examination showed progress of this lesion in mandible and maxilla.
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6
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Hershkovitz I, Spigelman M, Sarig R, Lim DS, Lee IS, Oh CS, May H, Boaretto E, Kim YS, Lee SD, Peled N, Kim MJ, Toledano T, Bar-Gal GK, Shin DH. A possible case of cherubism in a 17th-century Korean mummy. PLoS One 2014; 9:e102441. [PMID: 25093864 PMCID: PMC4122385 DOI: 10.1371/journal.pone.0102441] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 05/26/2014] [Indexed: 11/18/2022] Open
Abstract
Cherubism is a benign fibro-osseous disease of childhood limited specifically to the maxilla and mandible. The progressive replacement of the jaw bones with expansile multilocular cystic lesions causes eventual prominence of the lower face, and hence the classic “cherubic” phenotype reflecting variable extents of jaw hypertrophy. Histologically, this condition has been characterized as replacement of the normal bone matrix with multicystic pockets of fibrous stroma and osteoclastic giant cells. Because of radiographic features common to both, primarily the presence of multiloculated lucencies with heterogeneous “ground-glass” sclerosis on CT imaging, cherubism was long mistaken for a craniofacial subtype of fibrous dysplasia. In 1999, however, the distinct genetic basis for cherubism was mapped to chromosome 4p16.3 and the SH-3 binding protein SH3BP2. But while there are already three suspected cases of fibrous dysplasia amongst archaeological populations, no definitive cases of cherubism have yet been reported in historical populations. In the current study we describe micro- and macro-structural changes in the face of a 17th century Joseon Dynasty Korean mummy which may coincide with the clinic-pathologic and radiologic features of cherubism.
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Affiliation(s)
- Israel Hershkovitz
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
- * E-mail: (IH); (DHS)
| | - Mark Spigelman
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Rachel Sarig
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Do-Sun Lim
- Department of Dental Hygiene, Eulji University, Seongnam, Gyeonggi-do, Korea
| | - In Sun Lee
- Department of Diagnostic Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - Chang Seok Oh
- Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea
- Institute of Forensic Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Hila May
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Elisabetta Boaretto
- D-REAMS Radiocarbon Dating Laboratory, Weizmann Institute of Science, Rehovot, Israel
| | - Yi-Suk Kim
- Department of Anatomy, Ewha Womans University School of Medicine, Seoul, Korea
| | - Soong Deok Lee
- Institute of Forensic Medicine, Seoul National University College of Medicine, Seoul, Korea
- Department of Forensic Science, Seoul National University College of Medicine, Seoul, Korea
| | - Nathan Peled
- Department of Radiology, Carmel Medical Center, Haifa, Israel
| | - Myeung Ju Kim
- Department of Anatomy, Dankook University College of Medicine, Yongin-si, Gyeonggi-do, Korea
| | - Talya Toledano
- Department of Radiology, Maimonides Medical Center, Brooklyn, New York, United States of America
| | - Gila Kahila Bar-Gal
- Department of Virology, Koret School of Veterinary Medicine, Hebrew University of Jerusalem, Rehovot, Israel
| | - Dong Hoon Shin
- Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea
- Institute of Forensic Medicine, Seoul National University College of Medicine, Seoul, Korea
- * E-mail: (IH); (DHS)
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7
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Singh A, Singh K, Goel R, Hu Y, Reichenberger E, Kapoor S. Genetic study of an Indian family with cherubism. Indian J Pediatr 2014; 81:299-301. [PMID: 24005878 DOI: 10.1007/s12098-013-1195-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 07/18/2013] [Indexed: 11/24/2022]
Abstract
Cherubism (OMIM : 118400) is an autosomal dominant disorder affecting mainly facial bones leading to disfigurement of face needing medical and surgical attention besides impairing the self esteem of person. At present, there is no medical cure and there is limited indication for surgery in such cases. So, correct diagnosis is of paramount importance to both treating physician and family. Here, the authors report a family with two affected members (mother and daughter) who were tested positive for a known pathogenic mutation and thus offered timely treatment and adequate genetic counseling.
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Affiliation(s)
- Ankur Singh
- Division of Genetics, Department of Pediatrics, MAMC Associated Lok Nayak Hospital, New Delhi, India
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8
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Sangu N, Shimosato T, Inoda H, Shimada S, Shimojima K, Ando T, Yamamoto T. Novel nucleotide mutation leading to a recurrent amino acid alteration in SH3BP2 in a patient with cherubism. Congenit Anom (Kyoto) 2013; 53:166-9. [PMID: 24712477 DOI: 10.1111/cga.12013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 01/25/2013] [Indexed: 11/30/2022]
Abstract
Cherubism is a rare genetic disorder characterized by progressive facial deformity caused by non-neoplastic bone lesions in the mandible and/or the maxilla. Src homology-3 binding protein 2 gene (SH3BP2) has been found to be the responsible gene, with alterations in six amino acids noted in patients with this condition. Recently, mutations in this domain have been found to cause stabilization of SH3BP2 by uncoupling with tankyrase. In this study, we identified a new 2-bp mutation that led to a recurrent amino acid change in a sporadic case of cherubism. Our findings indicate that it is important to understand the pattern of progress in typical cherubism.
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Affiliation(s)
- Noriko Sangu
- Department of Oral and Maxillofacial Surgery, School of Medicine, Tokyo Women's Medical University, Tokyo; Institute for Integrated Medical Sciences, Tokyo Women's Medical University, Tokyo
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9
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Pérez-Sayáns M, Barros-Angueira F, Suárez-Peñaranda JÉ, García-García A. Variable expressivity familial cherubism: woman transmitting cherubism without suffering the disease. Head Face Med 2013; 9:33. [PMID: 24382142 PMCID: PMC3842775 DOI: 10.1186/1746-160x-9-33] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 10/31/2013] [Indexed: 11/10/2022] Open
Abstract
UNLABELLED Cherubism is classified within the group of benign osteo-fibrous lesions. Aside from facial deformities, it may account for major complications. It has been observed that the disease is caused by a mutation in the gene SH3BP2 (SH3-domain binding protein 2), which is located at chromosome 4pl6.3. Here we present two cases of familial cherubism, uncle and nephew, with variable clinical involvement ("Expressivity"), and one case of a woman (sister and mother, respectively), who transmitted cherubism without suffering the disease. In this article we have shown that, in familial cherubism cases, the mutation is inherited through an autosomal dominant transmission. Mutations affecting gene SH3BP2 cause variable clinical involvement (variable expressivity), involvement can be moderate, severe or may result merely in asymptomatic carriers. Since the possibility of transmission reaches 50% of chances, we believe that it is important to develop genetic counseling for both patients and carriers, in order to prevent or minimize new affected offspring. KEYWORDS Cherubism; SH3BP2; Expressivity.
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Abstract
This article will review current thoughts with regard to the etiology, histopathology, diagnosis, and management of giant cell lesions of the jaws. It will attempt to point out the differences between these lesions and giant cell lesions elsewhere in the body and also the current techniques for medical management of these conditions including steroid injections, calcitonin treatment, and alpha interferon treatment.
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Affiliation(s)
- Anthony M Pogrel
- Department of Oral and Maxillofacial Surgery, University of California San Francisco, San Francisco, CA, USA
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11
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Reichenberger EJ, Levine MA, Olsen BR, Papadaki ME, Lietman SA. The role of SH3BP2 in the pathophysiology of cherubism. Orphanet J Rare Dis 2012; 7 Suppl 1:S5. [PMID: 22640988 PMCID: PMC3359958 DOI: 10.1186/1750-1172-7-s1-s5] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Cherubism is a rare bone dysplasia that is characterized by symmetrical bone resorption limited to the jaws. Bone lesions are filled with soft fibrous giant cell-rich tissue that can expand and cause severe facial deformity. The disorder typically begins in children at ages of 2-5 years and the bone resorption and facial swelling continues until puberty; in most cases the lesions regress spontaneously thereafter. Most patients with cherubism have germline mutations in the gene encoding SH3BP2, an adapter protein involved in adaptive and innate immune response signaling. A mouse model carrying a Pro416Arg mutation in SH3BP2 develops osteopenia and expansile lytic lesions in bone and some soft tissue organs. In this review we discuss the genetics of cherubism, the biological functions of SH3BP2 and the analysis of the mouse model. The data suggest that the underlying cause for cherubism is a systemic autoinflammatory response to physiologic challenges despite the localized appearance of bone resorption and fibrous expansion to the jaws in humans.
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Affiliation(s)
- Ernst J Reichenberger
- Department of Reconstructive Sciences, Center for Regenerative Medicine and Skeletal Development, University of Connecticut Health Center, Farmington, CT, USA.
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12
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Mehrotra D, Kesarwani A. Cherubism: case report with review of literature. J Maxillofac Oral Surg 2012; 10:64-70. [PMID: 22379324 DOI: 10.1007/s12663-010-0164-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2007] [Accepted: 12/28/2010] [Indexed: 11/26/2022] Open
Abstract
Cherubism is a rare hereditary fibro-osseous lesion characterized by painless expansion of jaws in childhood and is known to regress without treatment after puberty. Wait and watch approach has been advocated by many authors. The disease starts early in life manifesting itself fully in the second decade of life and is almost regressed in the third decade. Here, we report two cases of cherubism with clinico-radiographic presentation of its classical features in their third and fourth decade of life respectively and review the literature.
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Reddy G, Reddy GSP, Reddy NS, Badam RK. Aggressive form of cherubism. J Clin Imaging Sci 2012; 2:8. [PMID: 22439132 PMCID: PMC3307211 DOI: 10.4103/2156-7514.93275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 02/07/2012] [Indexed: 11/24/2022] Open
Abstract
Cherubism is a rare non-neoplastic hereditary disease related to genetic mutations characterized by symmetrically swollen cheeks, particularly over the angles of the mandible, and an upward turning of the eyes. The affected mandible and maxilla begin to swell in early childhood, and gradually increase until the age of puberty. Apparently, surgical intervention is unnecessary unless significant functional, esthetic, or emotional disturbances develop. In the present paper, we report a case of cherubism, with classic features that was classified as grade 3, managed with surgery and followed up for 2-years after treatment.
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Affiliation(s)
- Gv Reddy
- Department of Oral and Maxillofacial Surgery, Panineeya Institute of Dental Sciences, Hyderabad, Andhra Pradesh, India
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14
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SH3BP2-encoding exons involved in cherubism are not associated with central giant cell granuloma. Int J Oral Maxillofac Surg 2011; 40:851-5. [PMID: 21680150 DOI: 10.1016/j.ijom.2011.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 04/03/2011] [Accepted: 04/08/2011] [Indexed: 11/21/2022]
Abstract
Central giant cell granuloma (CGCG) is a benign lesion with unpredictable biological behaviour ranging from a slow-growing asymptomatic swelling to an aggressive lesion associated with pain, bone and root resorption and also tooth displacement. The aetiology of the disease is unclear with controversies in the literature on whether it is mainly of reactional, inflammatory, infectious, neoplasic or genetic origin. To test the hypothesis that mutations in the SH3BP2 gene, as the principal cause of cherubism, are also responsible for, or at least associated with, giant cell lesions, 30 patients with CGCG were recruited for this study and subjected to analysis of germ line and/or somatic alterations. In the blood samples of nine patients, one codon alteration in exon 4 was found, but this alteration did not lead to changes at the amino acid level. In conclusion, if a primary genetic defect is the cause for CGCG it is either located in SH3BP2 gene exons not yet related to cherubism or in a different gene.
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15
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Orthognathic surgery in cherubism. J Oral Maxillofac Surg 2011; 69:541-5. [PMID: 21238849 DOI: 10.1016/j.joms.2010.07.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2010] [Revised: 07/16/2010] [Accepted: 07/27/2010] [Indexed: 11/22/2022]
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Abstract
To determine the mechanism for the increased osteoclastogenesis in the jaw of cherubism patients with SH3BP2 mutations we evaluated the effect of mutant compared to wild-type SH3BP2 on activation of osteoclast signaling pathways. Indeed mutant forms of SH3BP2 do induce greater osteoclastogenesis. Heterozygous activating mutations in exon 9 of SH3BP2 have been found in most patients with cherubism, an unusual genetic syndrome characterized by excessive remodeling of the mandible and maxilla due to spontaneous and excessive osteoclastic bone resorption. Here we have investigated the functional consequences of SH3BP2 mutations on sRANKL-induced osteoclastogenesis in RAW 264.7 pre-osteoclast cells. sRANKL-stimulated RAW 264.7 cells were transfected with wild-type or mutant SH3BP2 plasmids. NFAT-luciferase and tartrate resistant acid phosphatase (TRAP), a marker of osteoclastic differentiation, levels were evaluated. Western immunoblots were also performed to determine phosphorylation of key proteins involved in the PI-PLC pathway leading to NFATc1 translocation. Our results indicate that forced expression of mutant forms of SH3BP2, found in cherubism patients, in RAW 264.7 cells induce greater NFAT activity and greater expression of TRAP than forced expression of wild-type SH3BP2. These findings indicate that missense SH3BP2 mutations cause a gain of protein function. Moreover, over expression of SH3BP2 in RAW 264.7 cells potentiates sRANKL-stimulated phosphorylation of PLCγ1 and PLCγ2. Our studies demonstrate that cherubism is due to gain-of-function mutations in SH3BP2 that stimulate RANKL-induced activation of PLCγ. The consequent activation of calcineurin and NFAT proteins induces the excessive osteoclastic phenotype of cherubism.
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Affiliation(s)
- Steven A. Lietman
- Department of Orthopaedic Surgery, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio 44195
,Department of Biomedical Engineering, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio 44195
| | - Lihong Yin
- Department of Orthopaedic Surgery, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio 44195
,Department of Biomedical Engineering, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio 44195
| | - Michael A. Levine
- Department of Biomedical Engineering, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio 44195
,Division of Endocrinology and Diabetes, The Children’s Hospital of Philadelphia and University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
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Preda L, Dinca O, Bucur A, Dragomir C, Severin E. Identical Mutation in SH3BP2 Gene Causes Clinical Phenotypes with Different Severity in Mother and Daughter - Case Report. Mol Syndromol 2010; 1:87-90. [PMID: 21045962 DOI: 10.1159/000314268] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Cherubism is a particular form of fibrous dysplasia of the jaws. Familial occurrence was reported in most cases. The condition is a rare hereditary disorder with autosomal dominant inheritance, with complete penetrance in males and incomplete penetrance in females and variable expressivity. It is known to be caused by mutations in the gene encoding SH3-domain binding protein 2, SH3BP2 gene. Major diagnostic criteria are cherubic facial appearance, painless hard enlargement of the jaws, and frequently associated dental abnormalities. The aim of the study was to analyze clinical and genetic features of cherubism in a family with 3 daughters in which the youngest one was affected. Clinical and radiographic examinations, hematological and biochemical evaluations and biopsy were performed. Molecular genetic analysis consisted of PCR amplification and direct sequencing of selected exons of the SH3BP2 gene. Cherubism was suspected based on clinical and radiographic examinations of the 9-year-old daughter. She presented asymmetrical enlargement of the mandible, speech and swallowing problems and dental abnormalities on the lower jaw. There was no history of similar clinical findings in any of the daughters or the parents of the affected girl. Abnormal results were obtained by genetic analysis. A c.1244G>A mutation was identified in exon 9 of the SH3BP2 gene in the asymptomatic mother and her affected daughter. The identified mutation in the SH3BP2 gene is probably disease-causing. The asymptomatic mother transmitted the gene mutation to her affected daughter. Our results confirm the reduced penetrance and variable expression of the gene mutation.
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Affiliation(s)
- L Preda
- Oral Surgery Department, and 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania
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18
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Nicolae C, Olsen BR. Unexpected matrix diseases and novel therapeutic strategies. Cell Tissue Res 2009; 339:155-65. [PMID: 19813027 DOI: 10.1007/s00441-009-0874-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Accepted: 09/02/2009] [Indexed: 01/19/2023]
Abstract
Within the framework of a broad definition of the extracellular matrix (ECM), this review discusses three genetic disorders in which major pathogenetic features have been traced back to alterations in the levels/activities of matrix components. In each case, disease-associated alterations are found both intra- and extracellularly. The nature of the ECM involvement is surprising, offers an exciting therapeutic opportunity, and deepens our understanding of ECM-cell interactions. The first of these disorders, cherubism, is a case of inflammatory bone loss in the jaws of children for reasons that are surprisingly systemic in nature, considering the local nature of the disease. The primary defect involves an intracellular signaling molecule, but a major pathogenetic component and therapeutic target of the disease is the extracellular cytokine tumor necrosis factor alpha. The second disorder, Knobloch syndrome, is caused by recessive mutations in collagen XVIII. Although this protein has been classified as belonging to a group of structural macromolecules, the consequence of the mutations is impairment of cellular metabolism. The third disorder, infantile hemangioma, is a common tumor of capillary endothelial cells in infancy. The tumor appears within a few days/weeks after birth, grows rapidly over several months, and regresses over several years. The proliferative phase is the result of constitutively high levels of vascular endothelial cell growth factor (VEGF)-dependent signaling through VEGF receptor 2 (VEGFR2), but recent studies have led to the surprising conclusion that abnormalities in a cell-surface receptor complex controlling expression of the VEGF decoy receptor VEGFR1 is the underlying cause.
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Affiliation(s)
- Claudia Nicolae
- Department of Developmental Biology, Harvard School of Dental Medicine, Boston, MA 02115, USA
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Lietman SA, Yin L, Levine MA. SH3BP2 is an activator of NFAT activity and osteoclastogenesis. Biochem Biophys Res Commun 2008; 371:644-8. [PMID: 18440306 DOI: 10.1016/j.bbrc.2008.04.080] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Accepted: 04/11/2008] [Indexed: 10/22/2022]
Abstract
Heterozygous activating mutations in exon 9 of SH3BP2 have been found in most patients with cherubism, an unusual genetic syndrome characterized by excessive remodeling of the mandible and maxilla due to spontaneous and excessive osteoclastic bone resorption. Osteoclasts differentiate after binding of sRANKL to RANK induces a number of downstream signaling effects, including activation of the calcineurin/NFAT (nuclear factor of activated T cells) pathway. Here, we have investigated the functional significance of SH3BP2 protein on osteoclastogenesis in the presence of sRANKL. Our results indicate that SH3BP2 both increases nuclear NFATc1 in sRANKL treated RAW 264.7 preosteoclast cells and enhances expression of tartrate resistant acid phosphatase (TRAP), a specific marker of osteoclast differentiation. Moreover, overexpression of SH3BP2 in RAW 264.7 cells potentiates sRANKL-stimulated phosphorylation of PLCgamma1 and 2, thus providing a mechanistic pathway for the rapid translocation of NFATc1 into the nucleus and increased osteoclastogenesis in cherubism.
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Affiliation(s)
- Steven A Lietman
- Department of Orthopaedic Surgery, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
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20
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Sukov WR, Franco MF, Erickson-Johnson M, Chou MM, Unni KK, Wenger DE, Wang X, Oliveira AM. Frequency of USP6 rearrangements in myositis ossificans, brown tumor, and cherubism: molecular cytogenetic evidence that a subset of "myositis ossificans-like lesions" are the early phases in the formation of soft-tissue aneurysmal bone cyst. Skeletal Radiol 2008; 37:321-7. [PMID: 18265974 DOI: 10.1007/s00256-007-0442-z] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2007] [Revised: 12/03/2007] [Accepted: 12/06/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE USP6 rearrangements with several partner genes have been identified recently in primary but not in secondary aneurysmal bone cysts (ABCs). Several lesions show histologic features that may overlap with ABC, including myositis ossificans (MO), brown tumor, and cherubism. The objective of this study was to assess whether these lesions harbored USP6 rearrangements. MATERIALS AND METHODS Twelve patients with classic radiologic and histologic features of MO, 6 with brown tumors, and 5 with cherubism diagnosed at our institution were studied for the presence of USP6 rearrangements using fluorescence in situ hybridization with probes flanking the USP6 locus on chromosome 17p13. In addition, conventional cytogenetic analysis was performed in 2 patients with cherubism. RESULTS USP6 rearrangements were identified in 2 patients with radiologic and histologic features consistent with MO. None of the patients with brown tumor or cherubism demonstrated USP6 rearrangements. Cytogenetic analysis of the cherubism patients demonstrated normal karyotypes. CONCLUSION These findings indicate that a subset of cases with apparent classic histologic and imaging features of MO are rather better classified as being soft-tissue ABC with clonal USP6 rearrangements. In contrast, no USP6 rearrangements were found in patients with cherubism or brown tumor, supporting the prevailing view that these lesions are distinct biologic entities.
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Affiliation(s)
- William R Sukov
- Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
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Carvalho VM, Perdigão PF, Pimenta FJ, de Souza PEA, Gomez RS, De Marco L. A novel mutation of the SH3BP2 gene in an aggressive case of cherubism. Oral Oncol 2008; 44:153-5. [PMID: 17368082 DOI: 10.1016/j.oraloncology.2007.01.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2007] [Accepted: 01/09/2007] [Indexed: 11/21/2022]
Abstract
Cherubism is an autosomal dominant inherited syndrome characterized by excessive bone degradation of upper and lower jaw and its replacement with large amounts of fibrous tissue, which causes a characteristic facial swelling. A correlation with a mutation in the gene SH3BP2 has been previously demonstrated, but a model for its pathogenesis is not yet available. Here we describe a novel mutation in an aggressive case of cherubism located in the pleckstrin homology domain (PH) of the SH3BP2.
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Affiliation(s)
- Vinicius Magalhães Carvalho
- Department of Pharmacology, Universidade Federal de Minas Gerais, Avenida Antonio Carlos, 6627, Belo Horizonte, MG, Brazil
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22
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van Capelle CI, Hogeman PHG, van der Sijs-Bos CJM, Heggelman BGF, Idowu B, Slootweg PJ, Wittkampf ARM, Flanagan AM. Neurofibromatosis presenting with a cherubism phenotype. Eur J Pediatr 2007; 166:905-9. [PMID: 17120035 DOI: 10.1007/s00431-006-0334-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Accepted: 10/05/2006] [Indexed: 11/28/2022]
Abstract
We report on a child who presented clinical manifestations of both neurofibromatosis type 1 (NF1) and cherubism. With genetic testing, we found a mutation in the NF-1 gene, confirming the neurocutaneous disorder. Histology when correlated with radiological evaluation of a mandibular biopsy was consistent with cherubism. This is the first report in the literature of a child with proven neurofibromatosis type 1 and cherubism without extragnathic lesions. This emphasises that cherubism is a clinical phenotype that can be associated with a number of germline mutations involving SH3BP2, PTPN11 and NF1.
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Affiliation(s)
- C I van Capelle
- Department of Pediatrics, Meander Medisch Centrum, Amersfoort, The Netherlands
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Abstract
PURPOSE OF REVIEW This review provides an update on clinical, genetic, and immunologic aspects of the autoinflammatory bone disorders. RECENT FINDINGS Chronic noninfectious inflammation of the bone is a clinical feature of both chronic recurrent multifocal osteomyelitis and (to a lesser degree) cherubism. The genes responsible for Majeed syndrome (LPIN2), murine chronic multifocal osteomyelitis (pstpip2), and cherubism (SH3BP2 and possibly PTPN11) have been identified. Murine models of both chronic recurrent multifocal osteomyelitis and cherubism have demonstrated that the bone inflammation is mediated by hematopoietically derived cells and can occur in the absence of a functioning adaptive immune system. As the immunologic defects become better defined, the cells of the myeloid lineage are emerging as the primary players. SUMMARY Chronic multifocal osteomyelitis and cherubism are hereditary chronic inflammatory disorders in which bone is the primary inflammatory target. Recent genetic and immunologic discoveries demonstrate involvement of the innate immune system, which places these entities in the category of autoinflammatory disorders.
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Affiliation(s)
- Polly J Ferguson
- Department of Pediatrics, University of Iowa, Iowa City, Iowa 52242, USA.
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Abstract
Adaptor proteins that do not contain intrinsic enzymatic activity play a critical role in cell biology by regulating the assembly of large multimolecular signaling complexes involved in extracellular signal transduction. The increasing number of diseases associated with aberrant function or expression of adaptor proteins further illustrate their key role in cellular regulation. The adaptor 3BP2 (or SH3BP2) was originally identified more than 10 years ago as an c-Abl binding protein, and next as a partner of Syk family kinases in 1998. 3BP2 displays the typical modular organization of an adapter protein with an amino-terminal PH domain, a central proline rich region and a carboxyl-terminal SH2 domain. Although its physiological function remains unknown, studies have implicated a role for 3BP2 in immunoreceptor signaling through its interaction with a number of signaling molecules including Src and Syk families of protein tyrosine kinases, the membrane adaptor LAT, Vav exchange factors, PLC-gamma, and 14-3-3 proteins. Recently, the 3bp2/sh3bp2 locus was shown to be mutated in a rare human disease involved in cranial-facial development called cherubism, suggesting a role for 3BP2 in regulating osteoclast and hematopoietic cell function.
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Affiliation(s)
- Marcel Deckert
- Inserm U576, Régulation des réponses immune et inflammatoire, Hôpital de l'Archet, Route Saint-Antoine de Ginestière, 06202 Nice, France.
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Carvalho Silva E, Carvalho Silva GC, Vieira TC. Cherubism: Clinicoradiographic Features, Treatment, and Long-Term Follow-Up of 8 Cases. J Oral Maxillofac Surg 2007; 65:517-22. [PMID: 17307601 DOI: 10.1016/j.joms.2006.05.061] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2005] [Revised: 02/14/2006] [Accepted: 05/31/2006] [Indexed: 11/17/2022]
Affiliation(s)
- Edgard Carvalho Silva
- Department of Oral Surgery and Pathology, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
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26
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A new mutation in the SH3BP2 gene showing reduced penetrance in a family affected with cherubism. ACTA ACUST UNITED AC 2007; 103:378-81. [DOI: 10.1016/j.tripleo.2006.05.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Revised: 05/03/2006] [Accepted: 05/17/2006] [Indexed: 11/20/2022]
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Deckert M, Rottapel R. The adapter 3BP2: how it plugs into leukocyte signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2007; 584:107-14. [PMID: 16802602 DOI: 10.1007/0-387-34132-3_8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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28
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Silva GCC, Gomez RS, Vieira TC, Silva EC. Cherubism: long-term follow-up of 2 patients in whom it regressed without treatment. Br J Oral Maxillofac Surg 2006; 45:567-70. [PMID: 17030358 DOI: 10.1016/j.bjoms.2006.08.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/27/2006] [Indexed: 11/19/2022]
Abstract
Cherubism is a rare hereditary, self-limiting fibrous dysplasia characterised by painless enlargement of the jaws in childhood. Although, it is accepted that the lesions of cherubism are eventually replaced by bone, there have been few long-term follow-up reports with clinicoradiographic documentation of spontaneous remission of the disease, without treatment. We report two cases of cherubic boys who were followed for 17 and 19 years. Clinicoradiographic examination during this period showed regression of the disease without surgical correction.
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Affiliation(s)
- Guilherme Costa Carvalho Silva
- Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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29
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de la Fuente MA, Kumar L, Lu B, Geha RS. 3BP2 deficiency impairs the response of B cells, but not T cells, to antigen receptor ligation. Mol Cell Biol 2006; 26:5214-25. [PMID: 16809760 PMCID: PMC1592712 DOI: 10.1128/mcb.00087-06] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The adapter protein 3BP2 is expressed in lymphocytes; binds to Syk/ZAP-70, Vav, and phospholipase C-gamma (PLC-gamma); and is thought to be important for interleukin-2 gene transcription in T cells. To define the role of 3BP2 in lymphocyte development and function, we generated 3BP2-deficient mice. T-cell development, proliferation, cytokine secretion, and signaling in response to T-cell receptor (TCR) ligation were all normal in 3BP2(-/-) mice. 3BP2(-/-) mice had increased accumulation of pre-B cells in the bone marrow and a block in the progression of transitional B cells in the spleen from the T1 to the T2 stage, but normal numbers of mature B cells. B-cell proliferation, cell cycle progression, PLC-gamma2 phosphorylation, calcium mobilization, NF-ATp dephosphorylation, and Erk and Jnk activation in response to B-cell receptor (BCR) ligation were all impaired. These results suggest that 3BP2 is important for BCR, but not for TCR signaling.
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Affiliation(s)
- Miguel A de la Fuente
- Division of Immunology, Children's Hospital, 300 Longwood Ave., Boston, MA 02115, USA
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30
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Martínez-Tello FJ, Manjón-Luengo P, Martin-Pérez M, Montes-Moreno S. Cherubism associated with neurofibromatosis type 1, and multiple osteolytic lesions of both femurs: a previously undescribed association of findings. Skeletal Radiol 2005; 34:793-8. [PMID: 16096755 DOI: 10.1007/s00256-005-0938-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2005] [Revised: 03/30/2005] [Accepted: 03/31/2005] [Indexed: 02/08/2023]
Abstract
We present a patient with neurofibromatosis type 1, with the clinical, radiological and histological features of cherubism mandibular lesions, and multiple osteolytic, geographic lesions in both femurs, consistent with multiple non-ossifying fibromas. We have been unable to find a similar case in the world literature. We discuss our findings in relationship with a number of syndromes that present clinical, radiological or pathological similarities.
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Affiliation(s)
- Francisco J Martínez-Tello
- Departamento de Anatomía Patológica, Hospital Universitario "12 de Octubre", Carretera de Andalucía Km. 5400, 28041, Madrid, Spain.
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31
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Meng XM, Yu SF, Yu GY. Clinicopathologic study of 24 cases of cherubism. Int J Oral Maxillofac Surg 2005; 34:350-6. [PMID: 16053841 DOI: 10.1016/j.ijom.2004.09.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/06/2004] [Indexed: 12/13/2022]
Abstract
The authors reviewed 24 cases of familial or nonfamilial cherubism. The age at onset was between 6 and 10 years. It was characterized by bilateral painless swelling of jaws and eyes-to-heaven appearance was visible when the maxillae were affected as well. Radiographs showed well-defined multilocular radiolucencies and with age, thick sclerotic borders were visible. A malocclusive and abnormal dentition, worse in the mandible can be seen. Histopathologically, numerous randomly distributed multinucleated giant cells and vascular spaces within a fibrous connective tissue stroma with or without eosinophilic collagen perivascular cuffing were apparent. Multinucleated giant cells were positive for osteoclastic specific markers, tartrate-resistant acid phosphatase and human alphaV beta3 integrin, 23C6. Results after follow-up were available for 14 cases. Of these, no treatment was carried out in five cases, cherubism resolved (three cases) or grew slowly (two cases); curettage or surgical contouring was performed in seven cases, during the rapid growth of the lesions. This not only gave good immediate results, but also arrested active growth of remnant cherubic lesions and even stimulated bone regeneration. Segmental mandibulectomy followed by reconstruction was performed in two cases with extensive lesion and the risk of pathologic fracture of the mandible, and excellent results were obtained.
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Affiliation(s)
- X-M Meng
- Department of Oral Pathology, Peking University School of Stomatology, Haidian District, Beijing 100081, PR China.
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Miah SMS, Hatani T, Qu X, Yamamura H, Sada K. Point mutations of 3BP2 identified in human-inherited disease cherubism result in the loss of function. Genes Cells 2004; 9:993-1004. [PMID: 15507112 DOI: 10.1111/j.1365-2443.2004.00784.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Adaptor protein 3BP2 positively regulates the high affinity IgE receptor (FcepsilonRI)-mediated activation of degranulation in mast cells. Genetic study identified the point mutations of 3BP2 gene in human-inherited disease cherubism. The multiple cysts in cherubism lesion of jaw bones are filled with the activated osteoclasts and stromal cells, including mast cells. By over-expression study using rat basophilic leukaemia RBL-2H3 mast cells, we have analysed the effect of the point mutations on the function of 3BP2 protein, which plays a positive regulatory role on FcepsilonRI-mediated mast cell activation. Over-expression of 3BP2 mutants suppressed the antigen-induced degranulation and cytokine gene transcription. Antigen-induced phosphorylation of Vav1, activation of Rac1, extracellular signal regulated kinase (ERK), c-Jun N-terminal kinase (JNK), p38 mitogen activated protein kinase (MAPK), inhibitor of nuclear factor kappaB kinase (IKK) and nuclear factor of activated T cells (NFAT) were all impaired in the cells over-expressing the cherubism mutants of 3BP2. Furthermore, cherubism mutations of 3BP2 may abrogate the binding ability to interact with chaperone protein 14-3-3. These results demonstrate that over-expression of the mutant form of 3BP2 inhibits the antigen-induced mast cell activation. It suggests that point mutations of 3BP2 gene cause the dysfunction of 3BP2 in vivo.
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Affiliation(s)
- S M Shahjahan Miah
- Division of Proteomics, Department of Genome Sciences, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
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