1
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Wang SK, Zhang H, Wang YL, Seymen F, Koruyucu M, Simmer JP, Hu JCC. Phenotypic variability in LAMA3-associated amelogenesis imperfecta. Oral Dis 2023; 29:3514-3524. [PMID: 36326426 PMCID: PMC10154430 DOI: 10.1111/odi.14425] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/04/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Amelogenesis imperfecta (AI) is defined as inherited enamel malformations. LAMA3 (laminin alpha-3) encodes a critical protein component of the basement membrane (laminin-332). Individuals carrying heterozygous LAMA3 mutations have previously been shown to have localized enamel defects. This study aimed to define clinical phenotypes and to discern the genetic etiology for four AI kindreds. MATERIALS AND METHODS Whole-exome analyses were conducted to search for sequence variants associated with the disorder, and micro-computed tomography (μCT) to characterize the enamel defects. RESULTS The predominant enamel phenotype was generalized thin enamel with defective pits and grooves. Horizonal bands of hypoplastic enamel with chalky-white discoloration and enamel hypomineralization were also observed and demonstrated by μCT analyses of affected teeth. Four disease-causing LAMA3 mutations (NM_198129.4:c.3712dup; c.5891dup; c.7367del; c.9400G > C) were identified. Compound heterozygous MMP20 mutations (NM_004771.4:c.539A > G; c.692C > T) were also found in one proband with more severe enamel defects, suggesting a mutational synergism on disease phenotypes. Further analyses of the AI-causing mutations suggested that both α3A (short) and α3B (long) isoforms of LAMA3 are essential for enamel formation. CONCLUSIONS Heterozygous LAMA3 mutations can cause generalized enamel defects (AI1A) with variable expressivity. Laminin-332 is critical not only for appositional growth but also enamel maturation.
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Affiliation(s)
- Shih-Kai Wang
- Department of Dentistry, National Taiwan University School of Dentistry, No.1, Changde St., Taipei City 100, Taiwan
- Department of Pediatric Dentistry, National Taiwan University Children’s Hospital, No.8, Zhongshan S. Rd., Taipei City 100, Taiwan
| | - Hong Zhang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI 48108, USA
| | - Yin-Lin Wang
- Department of Dentistry, National Taiwan University School of Dentistry, No.1, Changde St., Taipei City 100, Taiwan
- Department of Pediatric Dentistry, National Taiwan University Children’s Hospital, No.8, Zhongshan S. Rd., Taipei City 100, Taiwan
| | - Figen Seymen
- Department of Pedodontics, Faculty of Dentistry, Altinbas University, Istanbul, 34147, Turkey
| | - Mine Koruyucu
- Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul, 34116, Turkey
| | - James P. Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI 48108, USA
| | - Jan C.-C. Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI 48108, USA
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Dong J, Ruan W, Duan X. Molecular-based phenotype variations in amelogenesis imperfecta. Oral Dis 2023; 29:2334-2365. [PMID: 37154292 DOI: 10.1111/odi.14599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 04/03/2023] [Accepted: 04/15/2023] [Indexed: 05/10/2023]
Abstract
Amelogenesis imperfecta (AI) is one of the typical dental genetic diseases in human. It can occur isolatedly or as part of a syndrome. Previous reports have mainly clarified the types and mechanisms of nonsyndromic AI. This review aimed to compare the phenotypic differences among the hereditary enamel defects with or without syndromes and their underlying pathogenic genes. We searched the articles in PubMed with different strategies or keywords including but not limited to amelogenesis imperfecta, enamel defects, hypoplastic/hypomaturation/hypocalcified, syndrome, or specific syndrome name. The articles with detailed clinical information about the enamel and other phenotypes and clear genetic background were used for the analysis. We totally summarized and compared enamel phenotypes of 18 nonsyndromic AI with 17 causative genes and 19 syndromic AI with 26 causative genes. According to the clinical features, radiographic or ultrastructural changes in enamel, the enamel defects were basically divided into hypoplastic and hypomineralized (hypomaturated and hypocalcified) and presented a higher heterogeneity which were closely related to the involved pathogenic genes, types of mutation, hereditary pattern, X chromosome inactivation, incomplete penetrance, and other mechanisms.The gene-specific enamel phenotypes could be an important indicator for diagnosing nonsyndromic and syndromic AI.
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Affiliation(s)
- Jing Dong
- State Key Laboratory of Military Stomatology, Shaanxi Key Laboratory of Stomatology, Department of Oral Biology & Clinic of Oral Rare Diseases and Genetic Diseases, School of Stomatology, National Clinical Research Center for Oral Disease, The Fourth Military Medical University, Xi'an, China
- College of Life Sciences, Northwest University, Xi'an, China
| | - Wenyan Ruan
- State Key Laboratory of Military Stomatology, Shaanxi Key Laboratory of Stomatology, Department of Oral Biology & Clinic of Oral Rare Diseases and Genetic Diseases, School of Stomatology, National Clinical Research Center for Oral Disease, The Fourth Military Medical University, Xi'an, China
| | - Xiaohong Duan
- State Key Laboratory of Military Stomatology, Shaanxi Key Laboratory of Stomatology, Department of Oral Biology & Clinic of Oral Rare Diseases and Genetic Diseases, School of Stomatology, National Clinical Research Center for Oral Disease, The Fourth Military Medical University, Xi'an, China
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3
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Kubanov AA, Chikin VV, Karamova AE, Monchakovskaya ES. Junctional epidermolysis bullosa: genotype-phenotype correlations. VESTNIK DERMATOLOGII I VENEROLOGII 2022. [DOI: 10.25208/vdv1391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Junctional epidermolysis bullosa most commonly results from mutations in theLAMA3, LAMB3, LAMC2, COL17A1, ITGA6 and ITGB4genes. Junctional epidermolysis bullosa is characterized by clinical heterogeneity. To date, scientific findings allow to evaluate correlations between the severity of clinical manifestations and genetic defects underlying in the development of the disease. A systematic literature search was performed using PubMed and RSCI, and keywords including junctional epidermolysis bullosa, laminin 332, collagen XVII, 64 integrin. The review includes description of clinical findings of junctional epidermolysis bullosa, mutation location and types, its impact on protein production and functions. To evaluate the impact of gene mutation on protein functions, this review explores the structure and functions of lamina lucida components, including laminin 332, collagen XVII and 64 integrin, which are frequently associated with the development of junctional epidermolysis bullosa. The correlation between severe types of junctional epidermolysis bullosa and mutations resulting in premature stop codon generation and complete absence of protein expression has been described. Although, genotype-phenotype correlations should be analyzed carefully due to mechanisms which enable to improve protein expression.
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4
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Shi L, Li X, Qian H. Anti-Laminin 332-Type Mucous Membrane Pemphigoid. Biomolecules 2022; 12:biom12101461. [PMID: 36291670 PMCID: PMC9599625 DOI: 10.3390/biom12101461] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 09/30/2022] [Accepted: 10/10/2022] [Indexed: 12/03/2022] Open
Abstract
Anti-laminin (LM) 332-type mucous membrane pemphigoid (MMP) is a rare autoimmune bullous disease and was originally discovered as anti-epiligrin cicatricial pemphigoid. Anti-LM332-type MMP has clinical manifestations similar to those of other types of MMP and can only be distinguished through the detection of circulating autoantibodies against LM332. Our group and others have established a number of immunological methods with varying sensitivity and specificity for detection of anti-LM332 autoantibodies; however, none of the established methods has been widely used for clinical diagnosis. There is currently no unified standard treatment, and it is very difficult to completely cure anti-LM332-type MMP. In addition, an increasing body of evidence suggests that there may be a strong correlation between anti-LM332-type MMP and tumors. In this article, we review the current progression of diagnosis and treatment of anti-LM332-type MMP, as well as the possible correlation between anti-LM332-type MMP and tumors.
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Affiliation(s)
- Luhuai Shi
- Dermatology Hospital of Jiangxi Province, Jiangxi Provincial Clinical Research Center for Skin Diseases, Candidate Branch of National Clinical Research Center for Skin Diseases, Dermatology Institute of Jiangxi Province, The Affiliated Dermatology Hospital of Nanchang University, Nanchang 330001, China
| | - Xiaoguang Li
- Department of Laboratory Medicine, Chronic Disease Research Center, Medical College, Dalian University, Dalian 116622, China
| | - Hua Qian
- Department of Laboratory Medicine, Chronic Disease Research Center, Medical College, Dalian University, Dalian 116622, China
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5
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Li F, Yu M, Fan Z, Wu J, Tian H, Feng H, Liu Y, Liu H, Han D. Rare compound heterozygous variants of LAMB3 and histological features of enamel and oral mucosa. Front Physiol 2022; 13:1006980. [PMID: 36299258 PMCID: PMC9589216 DOI: 10.3389/fphys.2022.1006980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/27/2022] [Indexed: 12/02/2022] Open
Abstract
Junctional epidermolysis bullosa (JEB) is a group of autosomal recessive disorders characterized by amelogenesis imperfecta (AI) and fragility of the skin and mucous membranes. The purpose of this study was to identify pathogenic gene variants and investigate the phenotypic characteristics of abnormal enamel structure and mucocutaneous lesions in a patient with JEB. Clinical examination of the patient revealed hypoplastic AI, skin lesions, and oral ulcers, whereas her parents were normal. Whole-exome sequencing (WES) and cDNA cloning identified compound heterozygous variants of LAMB3 in the proband: c.125G>C in exon 3, c.1288 + 1G>A in intron 11, and c.1348C>T in exon 12. Among these, c.125G>C was inherited from her father, and the other two variants were inherited from her mother. Functional prediction indicated that the variants might change protein structure and cause disease. Scanning electron microscopy (SEM) examination of the primary and permanent teeth revealed abnormal enamel morphology and microstructures. Hematoxylin-eosin (HE) and immunofluorescence (IF) staining showed significantly abnormal and disorganized epithelial cells in the gingival mucosa. Our results showed that this was a case of intermediate JEB1A (OMIM #226650) with autosomal recessive inheritance. The proband carried rare compound heterozygous variants of LAMB3. Our results broaden the variant spectrum of the LAMB3 gene and JEB cases. Moreover, this is the first study to identify histological malformations of the primary teeth and oral mucosa in LAMB3-related patients.
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Affiliation(s)
- Fang Li
- Third Clinical Division, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Miao Yu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Zhuangzhuang Fan
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Junyi Wu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Hua Tian
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Hailan Feng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Yang Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Haochen Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
- *Correspondence: Haochen Liu, ; Dong Han,
| | - Dong Han
- Department of Prosthodontics, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
- *Correspondence: Haochen Liu, ; Dong Han,
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6
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Shaw L, Sugden CJ, Hamill KJ. Laminin Polymerization and Inherited Disease: Lessons From Genetics. Front Genet 2021; 12:707087. [PMID: 34456976 PMCID: PMC8388930 DOI: 10.3389/fgene.2021.707087] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 07/13/2021] [Indexed: 01/13/2023] Open
Abstract
The laminins (LM) are a family of basement membranes glycoproteins with essential structural roles in supporting epithelia, endothelia, nerves and muscle adhesion, and signaling roles in regulating cell migration, proliferation, stem cell maintenance and differentiation. Laminins are obligate heterotrimers comprised of α, β and γ chains that assemble intracellularly. However, extracellularly these heterotrimers then assemble into higher-order networks via interaction between their laminin N-terminal (LN) domains. In vitro protein studies have identified assembly kinetics and the structural motifs involved in binding of adjacent LN domains. The physiological importance of these interactions has been identified through the study of pathogenic point mutations in LN domains that lead to syndromic disorders presenting with phenotypes dependent on which laminin gene is mutated. Genotype-phenotype comparison between knockout and LN domain missense mutations of the same laminin allows inferences to be drawn about the roles of laminin network assembly in terms of tissue function. In this review, we will discuss these comparisons in terms of laminin disorders, and the therapeutic options that understanding these processes have allowed. We will also discuss recent findings of non-laminin mediators of laminin network assembly and their implications in terms of basement membrane structure and function.
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Affiliation(s)
| | | | - Kevin J. Hamill
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
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7
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Castiglia D, Fortugno P, Condorelli AG, Barresi S, De Luca N, Pizzi S, Neri I, Graziano C, Trojan D, Ponzin D, Rossi S, Zambruno G, Tartaglia M. A Novel Phenotype of Junctional Epidermolysis Bullosa with Transient Skin Fragility and Predominant Ocular Involvement Responsive to Human Amniotic Membrane Eyedrops. Genes (Basel) 2021; 12:716. [PMID: 34064633 PMCID: PMC8151857 DOI: 10.3390/genes12050716] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 02/06/2023] Open
Abstract
Junctional epidermolysis bullosa (JEB) is a clinically and genetically heterogeneous skin fragility disorder frequently caused by mutations in genes encoding the epithelial laminin isoform, laminin-332. JEB patients also present mucosal involvement, including painful corneal lesions. Recurrent corneal abrasions may lead to corneal opacities and visual impairment. Current treatments are merely supportive. We report a novel JEB phenotype distinguished by the complete resolution of skin fragility in infancy and persistent ocular involvement with unremitting and painful corneal abrasions. Biallelic LAMB3 mutations c.3052-5C>G and c.3492_3493delCG were identified as the molecular basis for this phenotype, with one mutation being a hypomorphic splice variant that allows residual wild-type laminin-332 production. The reduced laminin-332 level was associated with impaired keratinocyte adhesion. Then, we also investigated the therapeutic power of a human amniotic membrane (AM) eyedrop preparation for corneal lesions. AM were isolated from placenta donors, according to a procedure preserving the AM biological characteristics as a tissue, and confirmed to contain laminin-332. We found that AM eyedrop preparation could restore keratinocyte adhesion in an in vitro assay. Of note, AM eyedrop administration to the patient resulted in long-lasting remission of her ocular manifestations. Our findings suggest that AM eyedrops could represent an effective, non-invasive, simple-to-handle treatment for corneal lesions in patients with JEB and possibly other EB forms.
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Affiliation(s)
- Daniele Castiglia
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, 00167 Rome, Italy; (P.F.); (N.D.L.)
| | - Paola Fortugno
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, 00167 Rome, Italy; (P.F.); (N.D.L.)
| | - Angelo Giuseppe Condorelli
- Genodermatosis Unit, Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (A.G.C.); (G.Z.)
| | - Sabina Barresi
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy; (S.B.); (S.P.); (M.T.)
| | - Naomi De Luca
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, 00167 Rome, Italy; (P.F.); (N.D.L.)
| | - Simone Pizzi
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy; (S.B.); (S.P.); (M.T.)
| | - Iria Neri
- Department of Experimental, Diagnostic and Specialty Medicine, Division of Dermatology, S. Orsola-Malpighi University Hospital, 40138 Bologna, Italy;
| | - Claudio Graziano
- Medical Genetics, S. Orsola-Malpighi University Hospital, 40138 Bologna, Italy;
| | | | - Diego Ponzin
- The Veneto Eye Bank Foundation, 30174 Venice, Italy;
| | - Sabrina Rossi
- Pathology Unit, Department of Laboratories, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy;
| | - Giovanna Zambruno
- Genodermatosis Unit, Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (A.G.C.); (G.Z.)
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00146 Rome, Italy; (S.B.); (S.P.); (M.T.)
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8
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Caley MP, Martins VL, Moore K, Lashari M, Nissinen L, Kähäri VM, Alexander S, Jones E, Harwood CA, Jones J, Donaldson M, Marshall JF, O'Toole EA. Loss of the laminin subunit alpha-3 induces cell invasion and macrophage infiltration in cutaneous squamous cell carcinoma. Br J Dermatol 2020; 184:923-934. [PMID: 32767748 DOI: 10.1111/bjd.19471] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 08/03/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Cutaneous squamous cell carcinoma (cSCC) is a common cancer that invades the dermis through the basement membrane. The role of the basement membrane in poorly differentiated cSCC is not well understood. OBJECTIVES To study the effect that loss of the laminin subunit alpha-3 (α3) chain from the tumour microenvironment has on tumour invasion and inflammatory cell recruitment. METHODS We examined the role of the basement membrane proteins laminin subunits α3, β3 and γ2 in SCC invasion and inflammatory cell recruitment using immunohistochemistry, short hairpin RNA knockdown, RNA-Seq, mouse xenograft models and patient tumour samples. RESULTS Analysis of SCC tumours and cell lines using antibodies specific to laminin chains α3, β3 and γ2 identified a link between poorly differentiated SCC and reduced expression of laminin α3 but not the other laminin subunits investigated. Knockdown of laminin α3 increased tumour invasion both in vitro and in vivo. Western blot and immunohistochemical staining identified increased phosphorylated myosin light chain with loss of laminin α3. Inhibition of ROCK (rho-associated protein kinase) but not Rac1 significantly reduced the invasive potential of laminin α3 knockdown cells. Knockdown of laminin subunits α3 and γ2 increased monocyte recruitment to the tumour microenvironment. However, only the loss of laminin α3 correlated with increased tumour-associated macrophages both in xenografted tumours and in patient tumour samples. CONCLUSIONS These data provide evidence that loss of the laminin α3 chain in cSCC has an effect on both the epithelial and immune components of cSCC, resulting in an aggressive tumour microenvironment.
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Affiliation(s)
- M P Caley
- Centre for Cell Biology and Cutaneous Research
| | - V L Martins
- Centre for Cell Biology and Cutaneous Research
| | - K Moore
- Barts Cancer Institute; Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - M Lashari
- Centre for Cell Biology and Cutaneous Research
| | - L Nissinen
- Department of Dermatology, University of Turku and Turku University Hospital, Turku, and MediCity Research Laboratory, University of Turku, Turku, Finland
| | - V-M Kähäri
- Department of Dermatology, University of Turku and Turku University Hospital, Turku, and MediCity Research Laboratory, University of Turku, Turku, Finland
| | - S Alexander
- Centre for Cell Biology and Cutaneous Research
| | - E Jones
- Centre for Cell Biology and Cutaneous Research
| | - C A Harwood
- Centre for Cell Biology and Cutaneous Research
| | - J Jones
- School of Molecular Biosciences, BLS 202F, Washington State University, Pullman, WA, USA
| | | | - J F Marshall
- Barts Cancer Institute; Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - E A O'Toole
- Centre for Cell Biology and Cutaneous Research
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9
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Schreurs O, Balta MG, Karatsaidis A, Schenck K. Composition of hemidesmosomes in basal keratinocytes of normal buccal mucosa and oral lichen planus. Eur J Oral Sci 2020; 128:369-378. [PMID: 32870574 DOI: 10.1111/eos.12732] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2020] [Indexed: 12/21/2022]
Abstract
Oral lichen planus (OLP) is a chronic inflammatory disease displaying ultrastructural disturbances in epithelial hemidesmosomes. The expression of several key hemidesmosomal components in OLP as well as in normal buccal mucosa is, however, unknown. The aim of the study was therefore to examine intracellular and extracellular components involved in hemidesmosomal attachment, in OLP (n = 20) and in normal buccal mucosa (n = 10), by immunofluorescence. In normal buccal mucosa, laminin-α3γ2, integrin-α6β4, CD151, collagen α-1(XVII) chain, and dystonin showed linear expression along the basal membrane, indicating the presence of type I hemidesmosomes. Plectin stained most epithelial cell membranes and remained unphosphorylated at S4642. In OLP, most hemidesmosomal molecules examined showed disturbed expression consisting of discontinuous increases, apicolateral location, and/or intracellular accumulation. Plectin showed S4642-phosphorylation at the basement membrane, and deposits of laminin-α3 and laminin-γ2 were found within the connective tissue. The disturbed expression of hemidesmosomal proteins in OLP indicates deficient attachment of the basal cell layer, which can contribute to detachment and cell death of basal keratinocytes seen in the disease.
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Affiliation(s)
- Olav Schreurs
- Institute of Oral Biology, University of Oslo, Oslo, Norway
| | - Maria G Balta
- Institute of Oral Biology, University of Oslo, Oslo, Norway
| | | | - Karl Schenck
- Institute of Oral Biology, University of Oslo, Oslo, Norway
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10
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Zhang J, Li Y, Li J, Shi Y, Hu J, Yang G. Surfce Functionalized via AdLAMA3 Multilayer Coating for Re-epithelization Around Titanium Implants. Front Bioeng Biotechnol 2020; 8:624. [PMID: 32596232 PMCID: PMC7300264 DOI: 10.3389/fbioe.2020.00624] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 05/21/2020] [Indexed: 11/29/2022] Open
Abstract
The peri-implant epithelium (PIE) forms a crucial seal between the oral environment and the implant surface. Compared with the junctional epithelium (JE), the biological sealing of PIE is fragile, which lacks hemidesmosomes (HDs) and internal basal lamina (extracellular matrix containing laminin332, IBL) on the upper part of the interface. In the study, we aim to prepare a coating with good biocompatibility and ability to immobilize the recombinant adenovirus vector of LAMA3 (AdLAMA3) for promoting the re-epithelization of PIE. The titanium surface functionalized with AdLAMA3 was established via layer-by-layer assembly technique and antibody-antigen specific binding. The biological evaluations including cell adhesion and the re-epithelization of PIE were investigated. The results in vitro demonstrated that the AdLAMA3 coating could improve epithelial cell attachment and cell spreading in the early stage. In vivo experiments indicated that the AdLAMA3 coating on the implant surface has the potential to accelerate the healing of the PIE, and could promote the expression of laminin α3 and the formation of hemidesmosomes. This study might provide a novel approach and experimental evidence for the precise attachment of LAMA3 to titanium surfaces. The process could improve the re-epithelization of PIE.
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Affiliation(s)
- Jing Zhang
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Yongzheng Li
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Jialu Li
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Yuan Shi
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Jinxing Hu
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
| | - Guoli Yang
- The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University School of Stomatology, Hangzhou, China
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11
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Chang YC, Wang JD, Chang HY, Zhou P, Hahn RA, Gordon MK, Laskin JD, Gerecke DR. Expression of Laminin γ2 Proteolytic Fragments in Murine Skin Following Exposure to Sulfur Mustard. Anat Rec (Hoboken) 2020; 303:1642-1652. [PMID: 32421930 DOI: 10.1002/ar.24405] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 09/24/2019] [Accepted: 09/29/2019] [Indexed: 12/14/2022]
Abstract
Laminin-332 is a basement membrane protein composed of three genetically distinct polypeptide chains that actively promote both skin epidermal cell adhesion and migration. Proteolytic fragments of the laminin γ2 chain stimulate migration and scattering of keratinocytes and cancer cells. Sulfur mustard (SM) is a bifunctional alkylating agent that induces separation of basal keratinocytes from the dermal-epidermal junction and invokes a strong inflammatory response leading to delayed wound repair. In the present studies, the role of laminin γ2 in SM-induced skin injury and wound repair was investigated using the mouse ear vesicant model. We found that laminin γ2 chain mRNA was preferentially upregulated in mouse ear skin exposed to SM. In situ hybridization confirmed overexpression of laminin γ2 transcript. Western blot analysis showed increased protein expression of the full-length proform of laminin γ2 and smaller processed fragments of laminin γ2 in skin exposed to SM. Dual immunofluorescence labeling indicated that laminin γ2 fragments are prevalent in suprabasal keratinocytes behind the leading edge in areas of hyperplasia in injured skin. In addition, co-expression of laminin γ2 and the senescent marker, p16-INK4a was found to overlap with the hyperplastic migratory epithelial sheet. This observation is similar to hypermotile keratinocytes reported in invasive carcinoma cells. Overall, our studies indicate that laminin γ2 is preferentially expressed in skin post SM exposure and that protein expression appears to become progressively more fragmented. The laminin γ2 fragments may play a role in regulating SM-induced skin wound repair. Anat Rec, 2020. © 2020 American Association for Anatomy.
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Affiliation(s)
- Yoke-Chen Chang
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - James D Wang
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - Hui-Ying Chang
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - Peihong Zhou
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - Rita A Hahn
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - Marion K Gordon
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
| | - Jeffrey D Laskin
- Environmental and Occupational Health, Rutgers University School of Public Health, Piscataway, New Jersey, USA
| | - Donald R Gerecke
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, USA
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12
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Rousselle P, Scoazec JY. Laminin 332 in cancer: When the extracellular matrix turns signals from cell anchorage to cell movement. Semin Cancer Biol 2020; 62:149-165. [PMID: 31639412 DOI: 10.1016/j.semcancer.2019.09.026] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Revised: 08/22/2019] [Accepted: 09/29/2019] [Indexed: 02/07/2023]
Abstract
Laminin 332 is crucial in the biology of epithelia. This large extracellular matrix protein consists of the heterotrimeric assembly of three subunits - α3, β3, and γ2 - and its multifunctionality relies on a number of extracellular proteolytic processing events. Laminin 332 is central to normal epithelium homeostasis by sustaining cell adhesion, polarity, proliferation, and differentiation. It also supports a major function in epithelial tissue formation, repair, and regeneration by buttressing cell migration and survival and basement membrane assembly. Interest in this protein increased after the discovery that its expression is perturbed in tumor cells, cancer-associated fibroblasts, and the tumor microenvironment. This review summarizes current knowledge regarding the established involvement of the laminin 332 γ2 chain in tumor invasiveness and discusses the role of its α3 and β3 subunits.
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Affiliation(s)
- Patricia Rousselle
- Laboratoire de Biologie Tissulaire et Ingénierie Thérapeutique, UMR 5305, CNRS - Université Lyon 1, Institut de Biologie et Chimie des Protéines, SFR BioSciences Gerland-Lyon Sud, 7 passage du Vercors, F-69367, France.
| | - Jean Yves Scoazec
- Gustave Roussy Cancer Campus, 114 rue Edouard Vaillant, 94805 Villejuif cedex, France; Université Paris Sud, Faculté de Médecine de Bicêtre, 94270 Le Kremlin Bicêtre, France
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13
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Fortugno P, Condorelli AG, Dellambra E, Guerra L, Cianfarani F, Tinaburri L, Proto V, De Luca N, Passarelli F, Ricci F, Zambruno G, Castiglia D. Multiple Skin Squamous Cell Carcinomas in Junctional Epidermolysis Bullosa Due to Altered Laminin-332 Function. Int J Mol Sci 2020; 21:E1426. [PMID: 32093196 PMCID: PMC7073068 DOI: 10.3390/ijms21041426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 02/12/2020] [Accepted: 02/18/2020] [Indexed: 12/31/2022] Open
Abstract
Variably reduced expression of the basement membrane component laminin-332 (α3aβ3γ2) causes junctional epidermolysis bullosa generalized intermediate (JEB-GI), a skin fragility disorder with an increased susceptibility to squamous cell carcinoma (SCC) development in adulthood. Laminin-332 is highly expressed in several types of epithelial tumors and is central to signaling pathways that promote SCC tumorigenesis. However, laminin-332 mutations and expression in individuals affected by JEB-GI and suffering from recurrent SCCs have been poorly characterized. We studied a JEB-GI patient who developed over a hundred primary cutaneous SCCs. Molecular analysis combined with gene expression studies in patient skin and primary keratinocytes revealed that the patient is a functional hemizygous for the p.Cys1171* mutant allele which is transcribed in a stable mRNA encoding for a β3 chain shortened of the last two C-terminal amino acids (Cys1171-Lys1172). The lack of the Cys1171 residue involved in the C-terminal disulphide bond to γ2 chain did not prevent assembly, secretion, and proteolytic processing of the heterotrimeric molecule. Immunohistochemistry of SCC specimens revealed accumulation of mutant laminin-332 at the epithelial-stromal interface of invasive front. We conclude that the C-terminal disulphide bond is a structural element crucial for laminin-332 adhesion function in-vivo. By saving laminin-332 amount, processing, and signaling role the p.Cys1171* mutation may allow intrinsic pro-tumorigenic properties of the protein to be conveyed, thus contributing to invasiveness and recurrence of SCCs in this patient.
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Affiliation(s)
- Paola Fortugno
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Angelo Giuseppe Condorelli
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, viale di San Paolo 15, 00146 Rome, Italy; (A.G.C.)
| | - Elena Dellambra
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Liliana Guerra
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Francesca Cianfarani
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Lavinia Tinaburri
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Vittoria Proto
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Naomi De Luca
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
| | - Francesca Passarelli
- Pathology Unit, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (F.P.); (F.R.)
| | - Francesca Ricci
- Pathology Unit, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (F.P.); (F.R.)
| | - Giovanna Zambruno
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, viale di San Paolo 15, 00146 Rome, Italy; (A.G.C.)
| | - Daniele Castiglia
- Laboratory of Molecular and Cell Biology, IDI-IRCCS, via Monti di Creta 104, 00167 Rome, Italy; (P.F.); (E.D.); (L.G.); (F.C.); (L.T.); (V.P.); (N.D.L.)
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14
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Shiokawa M, Kodama Y, Sekiguchi K, Kuwada T, Tomono T, Kuriyama K, Yamazaki H, Morita T, Marui S, Sogabe Y, Kakiuchi N, Matsumori T, Mima A, Nishikawa Y, Ueda T, Tsuda M, Yamauchi Y, Sakuma Y, Maruno T, Uza N, Tsuruyama T, Mimori T, Seno H, Chiba T. Laminin 511 is a target antigen in autoimmune pancreatitis. Sci Transl Med 2019; 10:10/453/eaaq0997. [PMID: 30089633 DOI: 10.1126/scitranslmed.aaq0997] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 02/28/2018] [Accepted: 07/09/2018] [Indexed: 12/15/2022]
Abstract
Autoimmune pancreatitis (AIP), a major manifestation of immunoglobulin G4-related disease (IgG4-RD), is an immune-mediated disorder, but the target autoantigens are still unknown. We previously reported that IgG in patients with AIP induces pancreatic injuries in mice by binding the extracellular matrix (ECM). In the current study, we identified an autoantibody against laminin 511-E8, a truncated laminin 511, one of the ECM proteins, in patients with AIP. Anti-laminin 511-E8 IgG was present in 26 of 51 AIP patients (51.0%), but only in 2 of 122 controls (1.6%), by enzyme-linked immunosorbent assay. Because truncated forms of other laminin family members in other organs have been reported, we confirmed that truncated forms of laminin 511 also exist in human and mouse pancreas. Histologic studies with patient pancreatic tissues showed colocalization of patient IgG and laminin 511. Immunization of mice with human laminin 511-E8 induced antibodies and pancreatic injury, fulfilling the pathologic criteria for human AIP. Four of 25 AIP patients without laminin 511-E8 antibodies had antibodies against integrin α6β1, a laminin 511 ligand. AIP patients with laminin 511-E8 antibodies exhibited distinctive clinical features, as the frequencies of malignancies or allergic diseases were significantly lower in patients with laminin 511-E8 antibodies than in those without. The discovery of these autoantibodies should aid in the understanding of AIP pathophysiology and possibly improve the diagnosis of AIP.
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Affiliation(s)
- Masahiro Shiokawa
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Yuzo Kodama
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan.
| | - Kiyotoshi Sekiguchi
- Laboratory of Extracellular Matrix Biochemistry, Institute for Protein Research, Osaka University, Suita 565-0871, Japan
| | - Takeshi Kuwada
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Teruko Tomono
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Katsutoshi Kuriyama
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Hajime Yamazaki
- Department of Healthcare Epidemiology, School of Public Health in the Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Toshihiro Morita
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Saiko Marui
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Yuko Sogabe
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Nobuyuki Kakiuchi
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Tomoaki Matsumori
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Atsushi Mima
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Yoshihiro Nishikawa
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Tatsuki Ueda
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Motoyuki Tsuda
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Yuki Yamauchi
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Yojiro Sakuma
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Takahisa Maruno
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Norimitsu Uza
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Tatsuaki Tsuruyama
- Department of Diagnostic Pathology, Kyoto University Hospital, Kyoto 606-8507, Japan
| | - Tsuneyo Mimori
- Department of Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hiroshi Seno
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Tsutomu Chiba
- Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan.,Kansai Electric Power Hospital, Osaka 553-0003, Japan
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15
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Smith C, Poulter J, Brookes S, Murillo G, Silva S, Brown C, Patel A, Hussain H, Kirkham J, Inglehearn C, Mighell A. Phenotype and Variant Spectrum in the LAMB3 Form of Amelogenesis Imperfecta. J Dent Res 2019; 98:698-704. [PMID: 30905256 PMCID: PMC6535922 DOI: 10.1177/0022034519835205] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Amelogenesis imperfecta (AI) is a heterogeneous group of inherited disorders characterized by abnormal formation of dental enamel, either in isolation or as part of a syndrome. Heterozygous variants in laminin subunit beta 3 ( LAMB3) cause AI with dominant inheritance in the absence of other cosegregating clinical features. In contrast, biallelic loss-of-function variants in LAMB3 cause recessive junctional epidermolysis bullosa, characterized by life-threatening skin fragility. We identified 2 families segregating autosomal dominant AI with variable degrees of a distinctive hypoplastic phenotype due to pathogenic variants in LAMB3. Whole exome sequencing revealed a nonsense variant (c.3340G>T, p.E1114*) within the final exon in family 1, while Sanger sequencing in family 2 revealed a variant (c.3383-1G>A) in the canonical splice acceptor site of the final exon. Analysis of cDNA from family 2 revealed retention of the final intron leading to a premature termination codon. Two unerupted third molar teeth from individual IV:5 in family 2 were subject to computerized tomography and scanning electron microscopy. LAMB3 molar teeth have a multitude of cusps versus matched controls. LAMB3 enamel was well mineralized but pitted. The architecture of the initially secreted enamel was abnormal, with cervical enamel appearing much less severely affected than coronal enamel. This study further defines the variations in phenotype-genotype correlation for AI due to variants in LAMB3, underlines the clustering of nonsense and frameshift variants causing AI in the absence of junctional epidermolysis bullosa, and highlights the shared AI phenotype arising from variants in genes coding for hemidesmosome proteins.
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Affiliation(s)
- C.E.L. Smith
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - J.A. Poulter
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
| | - S.J. Brookes
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - G. Murillo
- School of Dentistry, Universidad de
Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro Montes De Oca, Costa
Rica
| | - S. Silva
- Cellular and Molecular Biology Centre,
Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro Montes de
Oca, Costa Rica
| | - C.J. Brown
- Birmingham Dental Hospital and School of
Dentistry, Edgbaston, Birmingham, UK
| | - A. Patel
- Birmingham Dental Hospital and School of
Dentistry, Edgbaston, Birmingham, UK
| | - H. Hussain
- School of Medicine, University of Leeds,
Leeds, UK
| | - J. Kirkham
- Department of Oral Biology, School of
Dentistry, St James’s University Hospital, University of Leeds, Leeds, UK
| | - C.F. Inglehearn
- Division of Molecular Medicine, Leeds
Institute of Medical Research, University of Leeds, Leeds, UK
| | - A.J. Mighell
- School of Dentistry, University of
Leeds, Leeds, UK
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16
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Lincoln V, Cogan J, Hou Y, Hirsch M, Hao M, Alexeev V, De Luca M, De Rosa L, Bauer JW, Woodley DT, Chen M. Gentamicin induces LAMB3 nonsense mutation readthrough and restores functional laminin 332 in junctional epidermolysis bullosa. Proc Natl Acad Sci U S A 2018; 115:E6536-E6545. [PMID: 29946029 PMCID: PMC6048497 DOI: 10.1073/pnas.1803154115] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Herlitz junctional epidermolysis bullosa (H-JEB) is an incurable, devastating, and mostly fatal inherited skin disease for which there is only supportive care. H-JEB is caused by loss-of-function mutations in LAMA3, LAMB3, or LAMC2, leading to complete loss of laminin 332, the major component of anchoring filaments, which mediate epidermal-dermal adherence. LAMB3 (laminin β3) mutations account for 80% of patients with H-JEB, and ∼95% of H-JEB-associated LAMB3 mutations are nonsense mutations leading to premature termination codons (PTCs). In this study, we evaluated the ability of gentamicin to induce PTC readthrough in H-JEB laminin β3-null keratinocytes transfected with expression vectors encoding eight different LAMB3 nonsense mutations. We found that gentamicin induced PTC readthrough in all eight nonsense mutations tested. We next used lentiviral vectors to generate stably transduced H-JEB cells with the R635X and C290X nonsense mutations. Incubation of these cell lines with various concentrations of gentamicin resulted in the synthesis and secretion of full-length laminin β3 in a dose-dependent and sustained manner. Importantly, the gentamicin-induced laminin β3 led to the restoration of laminin 332 assembly, secretion, and deposition within the dermal/epidermal junction, as well as proper polarization of α6β4 integrin in basal keratinocytes, as assessed by immunoblot analysis, immunofluorescent microscopy, and an in vitro 3D skin equivalent model. Finally, newly restored laminin 332 corrected the abnormal cellular phenotype of H-JEB cells by reversing abnormal cell morphology, poor growth potential, poor cell-substratum adhesion, and hypermotility. Therefore, gentamicin may offer a therapy for H-JEB and other inherited skin diseases caused by PTC mutations.
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Affiliation(s)
- Vadim Lincoln
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Jon Cogan
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Yingping Hou
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Michaela Hirsch
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Michelle Hao
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Vitali Alexeev
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA 19107
| | - Michele De Luca
- Center for Regenerative Medicine "Stefano Ferrari," Department of Life Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy
| | - Laura De Rosa
- Center for Regenerative Medicine "Stefano Ferrari," Department of Life Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy
| | - Johann W Bauer
- EB House Austria and Department of Dermatology, University Hospital of the Paracelsus Medical University, 5020 Salzburg, Austria
| | - David T Woodley
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033
| | - Mei Chen
- Department of Dermatology, The Keck School of Medicine of University of Southern California, Los Angeles, CA 90033;
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17
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Substrate-mediated gene transduction of LAMA3 for promoting biological sealing between titanium surface and gingival epithelium. Colloids Surf B Biointerfaces 2018; 161:314-323. [DOI: 10.1016/j.colsurfb.2017.10.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 10/06/2017] [Accepted: 10/10/2017] [Indexed: 11/22/2022]
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18
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Sulfur mustard-stimulated proteases and their inhibitors in a cultured normal human epidermal keratinocytes model: A potential approach for anti-vesicant drug development. Toxicol Rep 2016; 3:393-400. [PMID: 28959561 PMCID: PMC5615839 DOI: 10.1016/j.toxrep.2016.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/10/2016] [Accepted: 03/11/2016] [Indexed: 11/24/2022] Open
Abstract
Protease stimulation in cultured normal human epidermal keratinocytes (NHEK) due to sulfur mustard (SM) exposure is well documented. However, the specific protease(s) stimulated by SM and the protease substrates remain to be determined. In this study, we observed that SM stimulates several proteases and the epidermal-dermal attachment protein laminin-5 is one of the substrates. We propose that following SM exposure of the skin, laminin-5 degradation causes the detachment of the epidermis from the dermis and, therefore, vesication. We utilized gelatin zymography, Western blotting, immuno-fluorescence staining, and real-time polymerase chain reaction (RT-PCR) analyses to study the SM-stimulated proteases and laminin-5 degradation in NHEK. Two major protease bands (64 kDa and 72 kDa) were observed by zymography in SM-exposed cells. Addition of serine protease inhibitor (aprotinin, 100 μM), or the metalloprotease inhibitor (amastatin, 100 μM) to NHEK cultures prior to SM exposure decreased the SM-stimulated protease bands seen by zymography. These inhibitors completely or partially prevented SM-induced laminin-5 γ2 degradation as seen by Western blotting as well as immuno-fluorescence staining. Our results from Western blotting and RT-PCR studies also indicated that the membrane-type matrix metalloproteinase-1 (MT-MM-1) may be involved in SM-induced skin blistering. To summarize, our results in the NHEK model indicate the following: (a) SM stimulates multiple proteases including serine protease(s), and metalloproteases; (b) SM decreases the level of laminin-5 γ2, which is prevented by either a serine protease inhibitor or a metalloprotease inhibitor and (c) MT-MMP-1 maybe one of the proteases that is involved in skin blistering due to SM exposure.
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19
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Fukazawa S, Shinto E, Tsuda H, Ueno H, Shikina A, Kajiwara Y, Yamamoto J, Hase K. Laminin β3 expression as a prognostic factor and a predictive marker of chemoresistance in colorectal cancer. Jpn J Clin Oncol 2015; 45:533-40. [PMID: 25770060 DOI: 10.1093/jjco/hyv037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 02/22/2015] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVE Laminin-332, a marker of epithelial-mesenchymal transition, is composed of a heterotrimer of α3, β3 and γ2 chains that regulates cell adhesion and migration. This study aimed to disclose the respective clinical significance of laminin β3 immunoexpression in colorectal cancer as a prognostic factor and a predictive marker of chemoresistance. METHODS Tissue specimens from 323 Stage II and 232 Stage III colorectal cancer patients who underwent curative resection were assessed using laminin β3 immunostaining. RESULTS Among Stage III colorectal cancer patients, comparisons of 5-year disease-free survival rates revealed a poorer prognosis for the laminin β3-high group than for the laminin β3-low group (52.3 vs. 70.7%, P = 0.038), while there was no significant difference among Stage II patients. Among laminin β3-low Stage III patients, those who received adjuvant chemotherapy showed marginally better disease-free survival than those who did not receive it (75.8 vs. 62.8%; P = 0.096). Furthermore, multivariate analysis corroborated a distinct benefit of adjuvant chemotherapy in laminin β3-low patients (P = 0.035; hazard risk ratio = 1.66). Analyses of the laminin β3-high group, however, failed to show significance. CONCLUSIONS Laminin β3 chain immunoreactivity was a poor prognostic factor for Stage III colorectal cancer patients, and laminin β3-high patients of Stage III colorectal cancer derived no survival benefit from adjuvant chemotherapy.
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Affiliation(s)
- Satomi Fukazawa
- Department of Surgery, National Defense Medical College, Saitama
| | - Eiji Shinto
- Department of Surgery, National Defense Medical College, Saitama
| | - Hitoshi Tsuda
- Department of Pathology, National Defense Medical College, Saitama, Japan
| | - Hideki Ueno
- Department of Surgery, National Defense Medical College, Saitama
| | - Atsushi Shikina
- Department of Surgery, National Defense Medical College, Saitama
| | - Yoshiki Kajiwara
- Department of Surgery, National Defense Medical College, Saitama
| | - Junji Yamamoto
- Department of Surgery, National Defense Medical College, Saitama
| | - Kazuo Hase
- Department of Surgery, National Defense Medical College, Saitama
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20
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Moon YW, Rao G, Kim JJ, Shim HS, Park KS, An SS, Kim B, Steeg PS, Sarfaraz S, Changwoo Lee L, Voeller D, Choi EY, Luo J, Palmieri D, Chung HC, Kim JH, Wang Y, Giaccone G. LAMC2 enhances the metastatic potential of lung adenocarcinoma. Cell Death Differ 2015; 22:1341-52. [PMID: 25591736 DOI: 10.1038/cdd.2014.228] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 11/18/2014] [Accepted: 11/28/2014] [Indexed: 12/14/2022] Open
Abstract
Lung cancer is the number one cancer killer, and metastasis is the main cause of high mortality in lung cancer patients. However, mechanisms underlying the development of lung cancer metastasis remain unknown. Using genome-wide transcriptional analysis in an experimental metastasis model, we identified laminin γ2 (LAMC2), an epithelial basement membrane protein, to be significantly upregulated in lung adenocarcinoma metastatic cells. Elevated LAMC2 increased traction force, migration, and invasion of lung adenocarcinoma cells accompanied by the induction of epithelial-mesenchymal transition (EMT). LAMC2 knockdown decreased traction force, migration, and invasion accompanied by EMT reduction in vitro, and attenuated metastasis in mice. LAMC2 promoted migration and invasion via EMT that was integrin β1- and ZEB1-dependent. High LAMC2 was significantly correlated with the mesenchymal marker vimentin expression in lung adenocarcinomas, and with higher risk of recurrence or death in patients with lung adenocarcinoma. We suggest that LAMC2 promotes metastasis in lung adenocarcinoma via EMT and may be a potential therapeutic target.
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Affiliation(s)
- Y W Moon
- 1] Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA [2] Division of Medical Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
| | - G Rao
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA
| | - J J Kim
- Department of Bioengineering, Johns Hopkins University, Baltimore, MD, USA
| | - H-S Shim
- Department of Pathology, Yonsei University College of Medicine, Seoul, South Korea
| | - K-S Park
- 1] Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA [2] Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA
| | - S S An
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
| | - B Kim
- Pathology Branch, National Cancer Institute, National Institutes of Health, MD, USA
| | - P S Steeg
- Women's Cancers Section, Laboratory of Molecular Pharmacology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - S Sarfaraz
- Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - L Changwoo Lee
- Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Donna Voeller
- Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - E Y Choi
- Department of Environmental Health Sciences, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
| | - Ji Luo
- Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - D Palmieri
- Women's Cancers Section, Laboratory of Molecular Pharmacology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - H C Chung
- Division of Medical Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
| | - J-H Kim
- Division of Medical Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
| | - Y Wang
- 1] Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA [2] Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA
| | - G Giaccone
- 1] Medical Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA [2] Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA
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21
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Di Zenzo G, El Hachem M, Diociaiuti A, Boldrini R, Calabresi V, Cianfarani F, Fortugno P, Piccinni E, Zambruno G, Castiglia D. A truncating mutation in the laminin-332α chain highlights the role of the LG45 proteolytic domain in regulating keratinocyte adhesion and migration. Br J Dermatol 2014; 170:1056-64. [PMID: 24387836 DOI: 10.1111/bjd.12816] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/28/2014] [Indexed: 01/21/2023]
Abstract
BACKGROUND Altered function of laminin-332 (α3β3γ2) consequent to mutations in the LAMA3, LAMB3 and LAMC2 genes causes junctional epidermolysis bullosa non-Herlitz (JEB-nH). JEB-nH patients suffer from skin blistering and have an increased risk of developing aggressive skin carcinomas in adulthood. Laminin-332 is proteolytically processed and its extracellular mature form lacks the α3 chain C-terminal globules 4 and 5 (LG45). The LG45 tandem has cell adhesion and protumorigenic properties. However, mutations that affect this domain are very rare and their functional effects in patients have not been explored to date. OBJECTIVE To characterize molecularly an adult patient with JEB-nH and altered laminin-332 expression presenting multiple skin carcinomas, and to analyse LG45-mediated biological functions using keratinocytes from the patient. METHODS A mutational search in laminin-332 genes was performed by hetero-duplex analysis. LAMA3 mRNA and laminin-332 protein levels in patient keratinocytes were investigated by real-time reverse transcriptase polymerase chain reaction and radioimmunoprecipitation assay, respectively. Keratinocyte migration was examined by scratch and Boyden chamber assays. RESULTS We identified a homozygous LAMA3 mutation, p.Leu1648TrpfsX32, which truncates the last 45 amino acids of the carboxyl terminal LG5 subdomain. Gene expression studies revealed that the mutant transcripts were stable and even increased, precursor laminin-332 molecules were retained intracellularly and the amount of mature extracellular heterotrimers was reduced to about 50%. Finally, the patient's keratinocytes migrated faster than normal keratinocytes. CONCLUSIONS Structural disruption of LG5 highlights the critical functions of the LG45 proteolytic region in precursor laminin-332 secretion and keratinocyte adhesion and migration. Perturbation of LG45 function might explain the non-aggressive behaviour of carcinomas in this patient.
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Affiliation(s)
- G Di Zenzo
- Laboratory of Molecular and Cell Biology, Istituto Dermopatico dell'Immacolata-IRCCS, via dei Monti di Creta 104, 00167, Rome, Italy
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22
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Abstract
Laminin 332, composed of the α3, β3 and γ2 chains, is an epithelial-basement membrane specific laminin variant. Its main role in normal tissues is the maintenance of epithelial-mesenchymal cohesion in tissues exposed to external forces, including skin and stratified squamous mucosa. After being secreted and deposited in the extracellular matrix, laminin 332 undergoes physiological maturation processes consisting in the proteolytic processing of domains located within the α3 and the γ2 chains. These maturation events are essential for laminin 332 integration into the basement membrane where it plays an important function in the nucleation and maintenance of anchoring structures. Studies in normal and pathological situations have revealed that laminin 332 can trigger distinct cellular events depending on the level of its proteolytic cleavages. In this review, the biological and structural characteristics of laminin 332 domains are presented and we discuss whether they trigger specific functions.
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Affiliation(s)
- Patricia Rousselle
- SFR BioSciences Gerland-Lyon Sud, Institut de Biologie et Chimie des Protéines, UMR 5305, CNRS, Université Lyon 1, Lyon, France.
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23
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Endo M, Zoltick PW, Radu A, Qiujie J, Matsui C, Marinkovich PM, McGrath J, Tamai K, Uitto J, Flake AW. Early intra-amniotic gene transfer using lentiviral vector improves skin blistering phenotype in a murine model of Herlitz junctional epidermolysis bullosa. Gene Ther 2012; 19:561-9. [PMID: 21938019 PMCID: PMC6541916 DOI: 10.1038/gt.2011.135] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Revised: 08/02/2011] [Accepted: 08/08/2011] [Indexed: 12/27/2022]
Abstract
Mutations of the LAMB3 gene cause a lethal form of junctional epidermolysis bullosa (JEB). We hypothesized that early intra-amniotic gene transfer in a severe murine model of JEB would improve or correct the skin phenotype. Time-dated fetuses from heterozygous LAMB3(IAP) breeding pairs underwent ultrasound guided intra-amniotic injection of lentiviral vector encoding the murine LAMB3 gene at embryonic day 8 (E8). Gene expression was monitored by immunohistochemistry. The transgenic laminin-β3 chain was shown to assemble with its endogenous partner chains, resulting in detectable amounts of laminin-332 in the basement membrane zone of skin and mucosa. Ultrastructually, the restoration of ∼60% of hemidesmosomal structures was also noted. Although we could correct the skin phenotype in 11.9% of homozygous LAMB3(IAP) mice, none survived beyond 48 h. However, skin transplants from treated E18 homozygous LAMB3(IAP) fetuses maintained normal appearance for 6 months with persistence of normal assembly of laminin-332. These results demonstrate for the first time long-term phenotypic correction of the skin pathology in a severe model of JEB by in vivo prenatal gene transfer. Although survival remained limited due to the limitations of this mouse model, this study supports the potential for treatment of JEB by prenatal gene transfer.
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Affiliation(s)
- M Endo
- Department of Surgery, The Children’s Center for Fetal Research, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Medicine, Abramson Research Center, Philadelphia, PA, USA
| | - PW Zoltick
- Department of Surgery, The Children’s Center for Fetal Research, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Medicine, Abramson Research Center, Philadelphia, PA, USA
| | - A Radu
- Department of Surgery, The Children’s Center for Fetal Research, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Medicine, Abramson Research Center, Philadelphia, PA, USA
| | - J Qiujie
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - C Matsui
- Department of Dermatology, University of Toyama, Toyama, Japan
| | - PM Marinkovich
- Department of Medical Dermatology, Stanford University, Redwood City, CA, USA
| | - J McGrath
- Division of Genetics and Molecular Medicine, Genetic Skin Disease Group, St John’s Institute of Dermatology, The Guy’s, King’s College, and St Thomas’ School of Medicine, London, UK
| | - K Tamai
- Division of Gene Therapy Science, Osaka University Graduate School of Medicine, Osaka, Japan
| | - J Uitto
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - AW Flake
- Department of Surgery, The Children’s Center for Fetal Research, The Children’s Hospital of Philadelphia, University of Pennsylvania School of Medicine, Abramson Research Center, Philadelphia, PA, USA
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24
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Degen M, Natarajan E, Barron P, Widlund HR, Rheinwald JG. MAPK/ERK-dependent translation factor hyperactivation and dysregulated laminin γ2 expression in oral dysplasia and squamous cell carcinoma. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 180:2462-78. [PMID: 22546478 DOI: 10.1016/j.ajpath.2012.02.028] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/02/2012] [Accepted: 02/07/2012] [Indexed: 01/13/2023]
Abstract
Lesions displaying a variety of dysplastic changes precede invasive oral and epidermal squamous cell carcinoma (SCC); however, there are no histopathological criteria for either confirming or staging premalignancy. SCCs and dysplasias frequently contain cells that abnormally express the γ2 subunit of laminin-332. We developed cell culture models to investigate γ2 dysregulation. Normal human keratinocytes displayed density-dependent repression of γ2, whereas premalignant keratinocytes and SCC cells overexpressed γ2 and secreted laminin assembly intermediates. Neoplastic cells had hyperactive EGFR/MAPK(ERK) signaling coordinate with overexpressed γ2, and EGFR and MEK inhibitors normalized γ2 expression. Keratinocytes engineered to express HPV16 E6 or activated mutant HRAS, cRAF1, or MEK1 lost density repression of γ2 and shared with neoplastic cells signaling abnormalities downstream of ERK, including increased phosphorylation of S6 and eIF4 translation factors. Notably, qPCR results revealed that γ2 overexpression was not accompanied by increased γ2 mRNA levels, consistent with ERK-dependent, eIF4B-mediated translation initiation of the stem-looped, 5'-untranslated region of γ2 mRNA in neoplastic cells. Inhibitors of MEK, but not of TORC1/2, blocked S6 and eIF4B phosphorylation and γ2 overexpression. Immunostaining of oral dysplasias identified γ2 overexpression occurring within fields of basal cells that had elevated p-S6 levels. These results reveal a causal relationship between ERK-dependent translation factor activation and laminin γ2 dysregulation and identify new markers of preinvasive neoplastic change during progression to SCC.
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Affiliation(s)
- Martin Degen
- Department of Dermatology, Brigham and Women's Hospital and Harvard Skin Disease Research Center, Boston, MA, USA
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25
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Mitsunaga S, Fujii S, Ishii G, Kinoshita T, Hasebe T, Aoyagi K, Sasaki H, Ochiai A. Nerve invasion distance is dependent on laminin gamma2 in tumors of pancreatic cancer. Int J Cancer 2010; 127:805-19. [PMID: 20013810 DOI: 10.1002/ijc.25104] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The distance of nerve invasion is an important prognostic factor in pancreatic cancer. The extracellular matrix (ECM) of nerve, mainly composed of laminin, collagen IV and anchoring fibrils, might affect nerve invasion. However, this relationship has not been demonstrated. Our study aimed at discovering the promoting factor of nerve invasion within the tumoral ECM. An animal model was established to evaluate the distance of nerve invasion in murine sciatic nerves by intraneural injection of 6 human pancreatic cancer cell lines. mRNA expression of laminins and anchoring fibrils was compared to the distance of nerve invasion for each cancer cell line. A target molecule provided the strong association between mRNA expression and the distance of nerve invasion. To evaluate the role of a target molecule in nerve invasion, protein expression and function were examined using an animal model and surgical cases. Cancer cells with high laminin gamma2 mRNA and protein expression in their basement membranes were associated with long nerve invasion. Knockdown of laminin gamma2 in cancer cells significantly shortened nerve invasion in the animal model. In 75 patients with pancreatic cancer, a large distance of nerve invasion was associated with high expression levels of laminin gamma2 mRNA and basement membranous deposition of laminin gamma2 protein. Our results indicate that laminin gamma2 plays an important role in nerve invasion. The measurement of the nerve invasion distance in our mouse nerve invasion model is useful for evaluating the molecular mechanisms of nerve invasion.
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Affiliation(s)
- Shuichi Mitsunaga
- Pathology Division, Research Center for Innovative Oncology, National Cancer Center Hospital East, Kashiwa, Japan
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26
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Liu S, Yamashita H, Weidow B, Weaver AM, Quaranta V. Laminin-332-beta1 integrin interactions negatively regulate invadopodia. J Cell Physiol 2010; 223:134-42. [PMID: 20039268 PMCID: PMC3150482 DOI: 10.1002/jcp.22018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Adhesion of epithelial cells to basement membranes (BM) occurs through two major structures: actin-associated focal contacts and keratin-associated hemidesmosomes, both of which form on laminin-332 (Ln-332). In epithelial-derived cancer cells, additional actin-linked structures with putative adhesive properties, invadopodia, are frequently present and mediate BM degradation. A recent study proposed that BM invasion requires a proper combination of focal contacts and invadopodia for invading cells to gain traction through degraded BM, and suggested that these structures may compete for common molecular components such as Src kinase. In this study, we tested the role of the Ln-332 in regulating invadopodia in 804G rat bladder carcinoma cells, a cell line that secretes Ln-332 and forms all three types of adhesions. Expression of shRNA to Ln-332 gamma2 chain (gamma2-kd) led to increased numbers of invadopodia and enhanced extracellular matrix degradation. Replating gamma2-kd cells on Ln-332 or collagen-I fully recovered cell spreading and inhibition of invadopodia. Inhibition of alpha3 or beta1, but not alpha6 or beta4, phenocopied the effect of gamma2-kd, suggesting that alpha3beta1-mediated focal contacts, rather than alpha6beta4-mediated hemidesmosome pathways, intersect with invadopodia regulation. gamma2-kd cells exhibited alterations in focal contact-type structures and in activation of focal adhesion kinase (FAK) and Src kinase. Inhibition of FAK also increased invadopodia number, which was reversible with Src inhibition. These data are consistent with a model whereby actin-based adhesions can limit the availability of active Src that is capable of invadopodia initiation and identifies Ln-332-beta1 interactions as a potent upstream regulator that limits cell invasion.
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Affiliation(s)
- Shanshan Liu
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Hironobu Yamashita
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Brandy Weidow
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Alissa M. Weaver
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Vito Quaranta
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232
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27
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Zboralski D, Warscheid B, Klein-Scory S, Malas MB, Becker H, Böckmann M, Meyer HE, Schmiegel W, Simon-Assmann P, Schwarte-Waldhoff I. Uncoupled responses of Smad4-deficient cancer cells to TNFalpha result in secretion of monomeric laminin-gamma2. Mol Cancer 2010; 9:65. [PMID: 20307265 PMCID: PMC2853515 DOI: 10.1186/1476-4598-9-65] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Accepted: 03/22/2010] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Functional loss of the tumor suppressor Smad4 is involved in pancreatic and colorectal carcinogenesis and has been associated with the acquisition of invasiveness. We have previously demonstrated that the heterotrimeric basement membrane protein laminin-332 is a Smad4 target. Namely, Smad4 functions as a positive transcriptional regulator of all three genes encoding laminin-332; its loss is thus implicated in the reduced or discontinuous deposition of the heterotrimeric basement membrane molecule as evident in carcinomas. Uncoupled expression of laminin genes, on the other hand, namely overexpression of the laminin-gamma2 chain is an impressive marker at invasive edges of carcinomas where tumor cells are maximally exposed to signals from stromal cell types like macrophages. As Smad4 is characterized as an integrator of multiple extracellular stimuli in a strongly contextual manner, we asked if loss of Smad4 may also be involved in uncoupled expression of laminin genes in response to altered environmental stimuli. Here, we address Smad4 dependent effects of the prominent inflammatory cytokine TNFalpha on tumor cells. RESULTS Smad4-reconstituted colon carcinoma cells like adenoma cells respond to TNFalpha with an increased expression of all three chains encoding laminin-332; coincubation with TGFbeta and TNFalpha leads to synergistic induction and to the secretion of large amounts of the heterotrimer. In contrast, in Smad4-deficient cells TNFalpha can induce expression of the gamma2 and beta3 but not the alpha3 chain. Surprisingly, this uncoupled induction of laminin-332 chains in Smad4-negative cells rather than causing intracellular accumulation is followed by the release of gamma2 into the medium, either in a monomeric form or in complexes with as yet unknown proteins. Soluble gamma2 is associated with increased cell migration. CONCLUSIONS Loss of Smad4 may lead to uncoupled induction of laminin-gamma2 in response to TNFalpha and may therefore represent one of the mechanisms which underlie accumulation of laminin-gamma2 at the invasive margin of a tumor. The finding, that gamma2 is secreted from tumor cells in significant amounts and is associated with increased cell migration may pave the way for further investigation to better understand its functional relevance for tumor progression.
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Affiliation(s)
- Dirk Zboralski
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
| | - Bettina Warscheid
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Susanne Klein-Scory
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
| | - M Bassel Malas
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
| | - Heiko Becker
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
| | - Miriam Böckmann
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Helmut E Meyer
- Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany
| | - Wolff Schmiegel
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
- Abtlg. Gastroenterologie und Hepatologie, Kliniken Bergmannsheil, Ruhr-Universität Bochum, Bochum, Germany
| | - Patricia Simon-Assmann
- Inserm, U682, Strasbourg, F-67200 France; Univ Strasbourg, UMR-S682, Strasbourg, F-67081 France
| | - Irmgard Schwarte-Waldhoff
- Medizinische Universitätsklinik, Knappschaftskrankenhaus, IMBL, Ruhr-Universität Bochum, Bochum, Germany
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28
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Hamill KJ, Kligys K, Hopkinson SB, Jones JCR. Laminin deposition in the extracellular matrix: a complex picture emerges. J Cell Sci 2010; 122:4409-17. [PMID: 19955338 DOI: 10.1242/jcs.041095] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Laminins are structural components of basement membranes. In addition, they are key extracellular-matrix regulators of cell adhesion, migration, differentiation and proliferation. This Commentary focuses on a relatively understudied aspect of laminin biology: how is laminin deposited into the extracellular matrix? This topic has fascinated researchers for some time, particularly considering the diversity of patterns of laminin that can be visualized in the matrix of cultured cells. We discuss current ideas of how laminin matrices are assembled, the role of matrix receptors in this process and how laminin-associated proteins modulate matrix deposition. We speculate on the role of signaling pathways that are involved in laminin-matrix deposition and on how laminin patterns might play an important role in specifying cell behaviors, especially directed migration. We conclude with a description of new developments in the way that laminin deposition is being studied, including the use of tagged laminin subunits that should allow the visualization of laminin-matrix deposition and assembly by living cells.
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Affiliation(s)
- Kevin J Hamill
- Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, IL 60611, USA
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29
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Armanet M, Wojtusciszyn A, Morel P, Parnaud G, Rousselle P, Sinigaglia C, Berney T, Bosco D. Regulated laminin-332 expression in human islets of Langerhans. FASEB J 2009; 23:4046-55. [PMID: 19667121 DOI: 10.1096/fj.08-127142] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Laminin-332 (LN-332) is a basement membrane component known to exert a beneficial effect on rat pancreatic beta cells in vitro. In this work, we analyzed the expression of LN-332 in human islets, its expression after inflammatory insults by cytokines, and the molecular mechanisms responsible for this effect. By Western blotting and RT-PCR, we showed that LN-332 was expressed in isolated human islets. By immunofluorescence on pancreas sections, we observed that labeling was confined to endocrine cells in islets. Confocal microscopy analysis on isolated islet cells revealed that labeling was granular but did not colocalize with hormone secretory granules. LN-332 was most abundant in cultured islets compared to freshly isolated islets and was found in culture medium, which suggests that it was secreted by islets. When islets were exposed to interleukin (IL)-1beta, expression and secretion of LN-332 increased as compared to control. No effect was observed with tumor necrosis factor (TNF)-alpha and interferon (IFN)-gamma. LY294002, an inhibitor of phosphatidylinositol 3-kinase (PI3-K) activity, inhibited culture- and IL-1beta-induced LN-332 expression in islets. These results show that LN-332, known to have some beneficial effect on beta cells in vitro, is produced and secreted by endocrine islet cells and is up-regulated by stressing conditions such as culture and IL-1beta-exposure.
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Affiliation(s)
- Mathieu Armanet
- Department of Surgery, Cell Isolation and Transplantation Center, Geneva University Hospitals and University of Geneva, 1211 Geneva-4, Switzerland
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30
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Guess CM, LaFleur BJ, Weidow BL, Quaranta V. A decreased ratio of laminin-332 beta3 to gamma2 subunit mRNA is associated with poor prognosis in colon cancer. Cancer Epidemiol Biomarkers Prev 2009; 18:1584-90. [PMID: 19383890 PMCID: PMC2869450 DOI: 10.1158/1055-9965.epi-08-1027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Laminin-332 (Ln-332) is a heterotrimeric glycoprotein (alpha3beta3gamma2) unique to epithelial cells with crucial roles in signaling, adhesion, and migration. Altered localization or expression levels of Ln-332, particularly its gamma2 subunit, are of prognostic value in a variety of cancers. However, the lack of standardized methodology and the limited quantification of previous study results have left unanswered questions, including the role of gamma2 transcript variants and whether differential expression of this chain represents dysregulation of the whole heterotrimer. Herein, we test the hypothesis that mRNA changes in one or more Ln-332 encoding genes can be used to distinguish between early- and advanced-stage cancer specimens and shed light on mechanistic questions raised by previous studies. Statistical analyses of human microarray data from the publicly available expression project in Oncology (expO) dataset, including examination of the distributions of Ln-332 subunit mRNA levels, identified a significant decrease in the Ln-332 beta3:gamma2 mRNA ratio between normal (n = 10) and early-stage colon cancer (n = 29) specimens. The beta3:gamma2 ratio was further decreased in metastatic colon cancer (n = 41) compared with early-stage samples. Our findings raise the possibility that Ln-332 gamma2 may be a therapeutic target against metastatic colon cancer because a lowered beta3:gamma2 ratio would reduce expression of heterotrimeric Ln-332 and increase monomeric gamma2 secretion. Further, standardized, quantitative methods for patient prognosis and therapeutic choice could be developed based upon the Ln-332 mRNA changes we uncovered.
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Affiliation(s)
- Cherise M. Guess
- Department of Microbial Pathogenesis and Immune Response, Meharry Medical College, Vanderbilt University Medical Center, Nashville, Tennessee
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Bonnie J. LaFleur
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Brandy L. Weidow
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, Tennessee
- Vanderbilt Integrative Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Vito Quaranta
- Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, Tennessee
- Vanderbilt Integrative Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee
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31
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Chang YC, Sabourin CLK, Lu SE, Sasaki T, Svoboda KKH, Gordon MK, Riley DJ, Casillas RP, Gerecke DR. Upregulation of gamma-2 laminin-332 in the mouse ear vesicant wound model. J Biochem Mol Toxicol 2009; 23:172-84. [PMID: 19526566 PMCID: PMC4465420 DOI: 10.1002/jbt.20275] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Epithelial cell migration during wound healing is regulated in part by enzymatic processing of laminin-332 (formerly LN-5), a heterodimer formed from alpha, beta, and gamma polypeptide chains. Under static conditions, laminin-332 is secreted into the extracellular matrix as a proform and has two chains processed to smaller forms, allowing it to anchor epithelial cells to the basement membrane of the dermis. During incisional wounding, laminin gamma2 chains in particular are processed to smaller sizes and function to promote epithelial sheet migration over the wound bed. The present study examines whether this same function occurs following chemical injury. The mouse ear vesicant model (MEVM) was used to follow the pathology in the ear and test whether processed laminin-332 enhances epithelial cell migration. Skin biopsies of sulfur mustard (SM) exposed ears for several time points were analyzed by histology, immunohistochemistry, real-time PCR, and Western blot analysis. SM exposure greatly increased mRNA levels for laminin-gamma2 in comparison to the other two chains. Protein production of laminin-gamma2 was upregulated, and there was an increase in the processed forms. Protein production was in excess of the amount required to form heterotrimeric laminin-332 and was associated with the migrating epithelial sheet, suggesting a potential role in wound healing for monomeric laminin-gamma2.
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Affiliation(s)
- Yoke-Chen Chang
- Department of Pharmacology & Toxicology, Ernest Mario School of Pharmacy, Rutgers University, EOHSI, 170 Frelinghuysen Road, Piscataway, NJ 08854, USA
| | | | - Shou-En Lu
- Department of Biostatistics, UMDNJ School of Public Health, 683 Hoes Lane West, Piscataway, NJ 08854, USA
| | - Takako Sasaki
- Department of Molecular Biology & Biochemistry, Oregon Health & Science University, Portland, OR 97239, USA
| | - Kathy K. H. Svoboda
- Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, TX 75246, USA
| | - Marion K. Gordon
- Department of Pharmacology & Toxicology, Ernest Mario School of Pharmacy, Rutgers University, EOHSI, 170 Frelinghuysen Road, Piscataway, NJ 08854, USA
| | - David J. Riley
- Department of Medicine, UMDNJ–Robert Wood Johnson Medical School, 675 Hoes Lane West, Piscataway, NJ 08854, USA
| | - Robert P. Casillas
- Battelle Memorial Institute, 505 King Avenue, Columbus, OH 43201-2693, USA
| | - Donald R. Gerecke
- Department of Pharmacology & Toxicology, Ernest Mario School of Pharmacy, Rutgers University, EOHSI, 170 Frelinghuysen Road, Piscataway, NJ 08854, USA
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32
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Kariya Y, Kato R, Itoh S, Fukuda T, Shibukawa Y, Sanzen N, Sekiguchi K, Wada Y, Kawasaki N, Gu J. N-Glycosylation of laminin-332 regulates its biological functions. A novel function of the bisecting GlcNAc. J Biol Chem 2008; 283:33036-45. [PMID: 18812317 PMCID: PMC2662246 DOI: 10.1074/jbc.m804526200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 09/11/2008] [Indexed: 11/06/2022] Open
Abstract
Laminin-332 (Lm332) is a large heterotrimeric glycoprotein that has been identified as a scattering factor, a regulator of cancer invasion as well as a prominent basement membrane component of the skin. Past studies have identified the functional domains of Lm332 and revealed the relationships between its activities and the processing of its subunits. However, there is little information available concerning the effects of N-glycosylation on Lm332 activities. In some cancer cells, an increase of beta1,6-GlcNAc catalyzed by N-acetylglucosaminyltransferase V (GnT-V) is related to the promotion of cancer cell motility. By contrast, bisecting GlcNAc catalyzed by N-acetylglucosaminyltransferase III (GnT-III) suppresses the further processing with branching enzymes, such as GnT-V, and the elongation of N-glycans. To examine the effects of those N-glycosylations to Lm332 on its activities, we purified Lm332s from the conditioned media of GnT-III- and GnT-V-overexpressing MKN45 cells. Lectin blotting and mass spectrometry analyses revealed that N-glycans containing the bisecting GlcNAc and beta1,6-GlcNAc structures were strongly expressed on Lm332 purified from GnT-III-overexpressing (GnT-III-Lm332) and GnT-V-overexpressing (GnT-V-Lm332) cells, respectively. Interestingly, the cell adhesion activity of GnT-III-Lm332 was apparently decreased compared with those of control Lm332 and GnT-V-Lm332. In addition, the introduction of bisecting GlcNAc to Lm332 resulted in a decrease in its cell scattering and migration activities. The weakened activities were most likely derived from the impaired alpha3beta1 integrin clustering and resultant focal adhesion formation. Taken together, our results clearly demonstrate for the first time that N-glycosylation may regulate the biological function of Lm332. This finding could introduce a new therapeutic strategy for cancer.
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Affiliation(s)
- Yoshinobu Kariya
- Division of Regulatory Glycobiology, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, Sendai, Miyagi 981-8558, Japan
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Jin X, Ray R, Ray P. An immunochromatographic assay to detect reduced level of laminin-5γ2 in sulfur mustard-exposed normal human epidermal keratinocytes. J Appl Toxicol 2008; 28:759-64. [DOI: 10.1002/jat.1335] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Phan HP, Ezure T, Ito M, Kadowaki T, Kitagawa Y, Niimi T. Expression and chain assembly of human laminin-332 in an insect cell-free translation system. Biosci Biotechnol Biochem 2008; 72:1847-52. [PMID: 18603785 DOI: 10.1271/bbb.80108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Laminins are a family of large heterotrimeric glycoproteins comprising alpha, beta, and gamma chains. To determine the molecular mechanisms underlying chain assembly in vitro, we expressed human laminin-332 subunits in an insect cell-free translation system. We successfully produced the beta3-gamma2 heterodimer and the alpha3-beta3-gamma2 heterotrimer of the laminin coiled-coil (LCC) domain following co-translation of each chain. The alpha3-beta3 and the alpha3-gamma2 heterodimer were not detected, suggesting that the alpha3 chain can assemble with only beta3-gamma2 heterodimer to form a heterotrimer via disulfide bonds. These results are consistent with those of a previous report indicating that laminin chain assembly proceeds through the beta-gamma heterodimer to the alpha-beta-gamma heterotrimer in vivo. We suggest that the cell-free translation system is a valid system with which to study the mechanisms underlying laminin chain assembly.
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Affiliation(s)
- Hoang-Phuong Phan
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Nagoya, Japan
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Hopkinson SB, DeBiase PJ, Kligys K, Hamill K, Jones JCR. Fluorescently tagged laminin subunits facilitate analyses of the properties, assembly and processing of laminins in live and fixed lung epithelial cells and keratinocytes. Matrix Biol 2008; 27:640-7. [PMID: 18617003 DOI: 10.1016/j.matbio.2008.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 06/09/2008] [Accepted: 06/10/2008] [Indexed: 01/11/2023]
Abstract
Recent analyses of collagen, elastin and fibronectin matrix assembly, organization and remodeling have been facilitated by the use of tagged proteins that can be visualized without the need for antibody labeling. Here, we report the generation of C-terminal tagged, full-length and "processed" (alpha3DeltaLG4-5) human alpha3 as well as C-terminal tagged, full-length human beta3 laminin subunits in adenoviral vectors. Human epidermal keratinocytes (HEKs) and human bronchial epithelial (BEP2D) cells, which assemble laminin-332-rich matrices, as well as primary rat lung alveolar type II (ATII) cells, which elaborate a fibrous network rich in laminin-311, were infected with adenovirus encoding the tagged human laminin subunits. In HEKs and BEP2D cells, tagged, full-length alpha3, alpha3DeltaLG4-5 and beta3 laminin subunits incorporate into arrays of matrix organized into patterns that are comparable to those observed when such cells are stained using laminin-332 subunit antibody probes. Moreover, HEKs and BEP2Ds move over these tagged, laminin-332-rich matrix arrays. We have also used the tagged beta3 laminin subunit-containing matrices to demonstrate that assembled laminin-332 arrays influence laminin matrix secretion and/or assembly. In the case of rat ATII cells, although tagged alpha3 laminin subunits are not detected in the matrix of rat ATII cells infected with virus encoding full-length human alpha3 laminin protein, processed human alpha3 laminin subunits are incorporated into an extracellular fibrous array. We discuss how these novel laminin reagents can be used to study the organization, processing and assembly of laminin matrices and how they provide new insights into the potential functional importance of laminin fragments.
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Affiliation(s)
- Susan B Hopkinson
- Division of Pulmonary and Critical Care Medicine, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA
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Takkunen M, Ainola M, Vainionpää N, Grenman R, Patarroyo M, García de Herreros A, Konttinen YT, Virtanen I. Epithelial-mesenchymal transition downregulates laminin alpha5 chain and upregulates laminin alpha4 chain in oral squamous carcinoma cells. Histochem Cell Biol 2008; 130:509-25. [PMID: 18496706 DOI: 10.1007/s00418-008-0443-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/07/2008] [Indexed: 12/19/2022]
Abstract
Basement membranes maintain the epithelial phenotype and prevent invasion and metastasis. We hypothesized that expression of basement membrane laminins might be regulated by epithelial-mesenchymal transition (EMT), hallmark of cancer progression. As EMT is mediated by transcription factor Snail, we used oral squamous carcinoma cells obtained from a primary tumor (43A), from its EMT-experienced recurrence (43B) and Snail-transfected 43A cells (43A-SNA) displaying full EMT, as a model to study laminins and their receptors. Northern blotting, immunofluorescence, and immunoprecipitation showed a gradual loss of laminin-511 and its receptor Lutheran from 43A to 43B and 43A-SNA cells. In contrast, neoexpression of laminin alpha4 mRNA was found congruent with synthesis of laminin-411. Chromatin immunoprecipitation disclosed direct binding of Snail to regions upstream of laminin alpha5 and alpha4 genes. Immunofluorescence and immunoprecipitation showed a switch from hemidesmosomal integrin alpha(6)beta(4) to alpha(6)beta(1) and neoexpression of alpha(1)beta(1) in 43A-SNA cells, and upregulation of integrin-linked kinase in both 43B and 43A-SNA cells. The cells adhered potently to laminin-511 and fibronectin, whereas adhesion to laminin-411 was minimal. In contrast, laminin-411 inhibited cell adhesion to other extracellular matrix proteins. In conclusion, EMT induces a switch from laminin-511 to laminin-411 expression, which may be directly controlled by Snail. Concomitant changes take place in laminin- and collagen-binding receptors. Laminin-411 reduces adhesion to laminin-511 and fibronectin, suggesting that tumor cells could utilize laminin-411 in their invasive behavior.
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Affiliation(s)
- Minna Takkunen
- Institute of Biomedicine/Anatomy, University of Helsinki, PO Box 63 (Haartmaninkatu 8), 00014 Helsinki, Finland.
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Igoucheva O, Kelly A, Uitto J, Alexeev V. Protein therapeutics for junctional epidermolysis bullosa: incorporation of recombinant beta3 chain into laminin 332 in beta3-/- keratinocytes in vitro. J Invest Dermatol 2007; 128:1476-86. [PMID: 18079746 DOI: 10.1038/sj.jid.5701197] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Junctional epidermolysis bullosa (JEB) is an inherited mechanobullous disease characterized by reduced adherence of the epidermal keratinocytes to the underlying dermis, and is often caused by the absence of functional laminin 332 due to the lack or dysfunction of its beta3 chain. As there are no specific therapies for JEB, we tested whether a protein replacement strategy could be applicable for the restoration of the laminin 332 assembly and reversion of the JEB phenotype in human keratinocytes that lack beta3 subunit. Here, we developed the protocol for production and purification of the biologically active recombinant beta3 chain. Next, we demonstrated that delivery of recombinant beta3 polypeptide into the endoplasmic reticulum of the immortalized beta3-null keratinocytes led to the restoration of the laminin 332 assembly, secretion, and deposition into the basement membrane zone, as confirmed by Western blot analysis, confocal immunofluorescent microscopy in vitro, and on cultured organotypic human JEB skin reconstructs. Although the amount of laminin 332 produced by protein-treated beta3-null keratinocytes is lower than that in normal human keratinocytes, our results demonstrate the applicability of the recombinant proteins for JEB treatment and open new perspectives for the development of novel therapeutics for this inherited, currently intractable, skin disorder.
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Affiliation(s)
- Olga Igoucheva
- Department of Dermatology and Cutaneous Biology, Jefferson Medical College, Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
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Sullivan SR, Underwood RA, Sigle RO, Fukano Y, Muffley LA, Usui ML, Gibran NS, Antezana MA, Carter WG, Olerud JE. Topical application of laminin-332 to diabetic mouse wounds. J Dermatol Sci 2007; 48:177-88. [PMID: 17719208 PMCID: PMC2151474 DOI: 10.1016/j.jdermsci.2007.07.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Revised: 07/02/2007] [Accepted: 07/09/2007] [Indexed: 12/22/2022]
Abstract
BACKGROUND Keratinocyte migration is essential for wound healing and diabetic wound keratinocytes migrate poorly. Keratinocyte migration and anchorage appears to be mediated by laminin-332 (LM-332). Impaired diabetic wound healing may be due to defective LM-332 mediated keratinocyte migration. OBJECTIVE To evaluate LM-332 expression in diabetic (db/db) and control (db/-) mice and to test LM-332 wound healing effects when applied to mouse wounds. METHODS LM-332 expression in mouse wounds was evaluated using immunohistochemistry. LM-332 wound healing effects were evaluated by directly applying soluble LM-332, a LM-332 biomaterial, or a control to mouse wounds. Percent wound closure and histology score, based on healing extent, were measured. RESULTS Precursor LM-332 expression was markedly reduced in db/db when compared to db/- mice. In vitro, soluble LM-332 and LM-332 biomaterial demonstrated significant keratinocyte adhesion. In vivo, soluble LM-332 treated wounds had the highest histology score, but significant differences were not found between wound treatments (p>0.05). No differences in percentage wound closure between treatment and control wounds were found (p>0.05). CONCLUSION The db/db wounds express less precursor LM-332 when compared to db/-. However, LM-332 application did not improve db/db wound healing. LM-332 purified from keratinocytes was primarily physiologically cleaved LM-332 and may not regulate keratinocyte migration. Application of precursor LM-332 rather than cleaved LM-332 may be necessary to improve wound healing, but this isoform is not currently available in quantities sufficient for testing.
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Affiliation(s)
- Stephen R. Sullivan
- Department of Surgery (Plastic and Reconstructive Surgery, University of Washington, Seattle, Washington
| | - Robert A. Underwood
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington
| | | | - Yuko Fukano
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington
| | - Lara A. Muffley
- Department of Surgery (Plastic and Reconstructive Surgery, University of Washington, Seattle, Washington
| | - Marcia L. Usui
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington
| | - Nicole S. Gibran
- Department of Surgery (Plastic and Reconstructive Surgery, University of Washington, Seattle, Washington
| | - Marcos A. Antezana
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington
| | - William G. Carter
- Department of Pathobiology, University of Washington, Seattle, Washington
- Fred Hutchinson Cancer Research Center, Seattle, Washington
| | - John E. Olerud
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington
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Wu X, Quondamatteo F, Brakebusch C. Cdc42 expression in keratinocytes is required for the maintenance of the basement membrane in skin. Matrix Biol 2006; 25:466-74. [PMID: 17049825 DOI: 10.1016/j.matbio.2006.09.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2006] [Revised: 08/01/2006] [Accepted: 09/06/2006] [Indexed: 01/16/2023]
Abstract
Cdc42 is a small GTPase, which acts as a molecular switch to regulate a wide variety of cellular functions, such as actin cytoskeleton organization, cell proliferation, apoptosis, cell migration and in particular, cell polarity. Formation and maintenance of the basement membrane is a polarized process, which requires directed secretion, deposition and organization of basement membrane components at the basal side of epithelial cells. In the current study, we analyzed the maintenance of skin basement membrane in mice with a keratinocyte-restricted deletion of the Cdc42 gene. In the absence of Cdc42, basement membrane components became aberrantly deposited and the processing of laminin 5 was impaired in parts of the dermal-epidermal junction. These impairments became more severe with age and corresponded to local defects of the basement membrane in 4.5-month-old mutant mice. However, both, structure and number of hemidesomosomes were not significantly changed in the Cdc42 mutant skin compared with the control mice and no blister formation was observed in mutant skin. These data indicate that Cdc42 in keratinocytes is important for maintenance of the basement membrane of skin.
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Affiliation(s)
- Xunwei Wu
- University of Copenhagen, Institute of Molecular Pathology, Fredrik V's Vej 11, 2100 Copenhagen, Denmark
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Sehgal BU, DeBiase PJ, Matzno S, Chew TL, Claiborne JN, Hopkinson SB, Russell A, Marinkovich MP, Jones JCR. Integrin beta4 regulates migratory behavior of keratinocytes by determining laminin-332 organization. J Biol Chem 2006; 281:35487-98. [PMID: 16973601 PMCID: PMC2820731 DOI: 10.1074/jbc.m606317200] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Whether alpha6beta4 integrin regulates migration remains controversial. beta4 integrin-deficient (JEB) keratinocytes display aberrant migration in that they move in circles, a behavior that mirrors the circular arrays of laminin (LM)-332 in their matrix. In contrast, wild-type keratinocytes and JEB keratinocytes, induced to express beta4 integrin, assemble laminin-332 in linear tracks over which they migrate. Moreover, laminin-332-dependent migration of JEB keratinocytes along linear tracks is restored when cells are plated on wild-type keratinocyte matrix, whereas wild-type keratinocytes show rotation over circular arrays of laminn-332 in JEB keratinocyte matrix. The activities of Rac1 and the actin cytoskeleton-severing protein cofilin are low in JEB keratinocytes compared with wild-type cells but are rescued following expression of wild-type beta4 integrin in JEB cells. Additionally, in wild-type keratinocytes Rac1 is complexed with alpha6beta4 integrin. Moreover, Rac1 or cofilin inactivation induces wild-type keratinocytes to move in circles over rings of laminin-332 in their matrix. Together these data indicate that laminin-332 matrix organization is determined by the alpha6beta4 integrin/actin cytoskeleton via Rac1/cofilin signaling. Furthermore, our results imply that the organizational state of laminin-332 is a key determinant of the motility behavior of keratinocytes, an essential element of skin wound healing and the successful invasion of epidermal-derived tumor cells.
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Affiliation(s)
- Bernd U. Sehgal
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Phillip J. DeBiase
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Sumio Matzno
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Teng-Leong Chew
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Jessica N. Claiborne
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Susan B. Hopkinson
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
| | - Alan Russell
- Department of Molecular and Cell Biology, Cytokinetics, Inc., South San Francisco, California 94080
| | - M. Peter Marinkovich
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California 94305
- Veterans Affairs Palo Alto Health Care System, Stanford, California 94304
| | - Jonathan C. R. Jones
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
- To whom correspondence should be addressed: Dept. of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, 303 E. Chicago Ave., Chicago, IL 60611. Tel.: 312-503-1412; Fax: 312-503-6475;
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Li J, Zhou L, Tran HT, Chen Y, Nguyen NE, Karasek MA, Marinkovich MP. Overexpression of laminin-8 in human dermal microvascular endothelial cells promotes angiogenesis-related functions. J Invest Dermatol 2006; 126:432-40. [PMID: 16374451 PMCID: PMC2535788 DOI: 10.1038/sj.jid.5700089] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study examined the effects of endogenous overexpression of laminin-8 on angiogenesis and wound healing in primary human dermal microvascular endothelial cells (HDMECs). HDMECs expressed laminin-8 and laminin-10, but no other laminins, as determined by radioimmunoprecipitation assay using a panel of antibodies to individual laminin chains. To study laminin-8 function, full-length human laminin alpha4 cDNA was retrovirally transferred to HDMEC, and specific overexpression of laminin-8 was verified by Western blot. Laminin-8 overexpression promoted endothelial cell spreading and migration in scratch assays and accelerated angiogenic tubule formation in collagen gel overlay assays. Strong inhibitory effect of beta1 integrin and weak inhibition by alphavbeta3 integrin antibodies were observed in laminin-8-stimulated cell migration, but only beta1 integrin antibodies affected tubule formation. These studies suggest that laminin-8 overexpression may prove to be a useful method to engineer HDMECs to promote angiogenesis and wound repair.
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Affiliation(s)
- Jie Li
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Lisa Zhou
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Hoang T. Tran
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Yi Chen
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Ngon E. Nguyen
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - Marvin A. Karasek
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
| | - M. Peter Marinkovich
- Dermatology Service, Palo Alto VA Health Care System, Stanford University School of Medicine, Stanford, California, USA
- Program in Epithelial Biology, Stanford University School of Medicine, Stanford, California, USA
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Kwon YJ, Pérez P, Aguilera S, Molina C, Leyton L, Alliende C, Leyton C, Brito M, Romo R, González MJ. Involvement of specific laminins and nidogens in the active remodeling of the basal lamina of labial salivary glands from patients with Sjögren's syndrome. ACTA ACUST UNITED AC 2006; 54:3465-75. [PMID: 17075843 DOI: 10.1002/art.22177] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECTIVE To investigate remodeling of the basal lamina of labial salivary glands (LSGs) from patients with Sjögren's syndrome (SS) by analyzing the expression of specific components that participate in its assembly and attachment to acinar and ductal cells. METHODS Two groups of SS patients with similar levels of remnant glandular tissue but with low and high levels of interacinar fibrosis, respectively, were studied. The expression of laminin alpha1, alpha4, and gamma2 chains and nidogens was examined at the messenger RNA (mRNA) and protein levels. Nidogens 1 and 2 were also studied in situ by immunohistochemistry. RESULTS Increases in the amount of mRNA and protein for both the processed and unprocessed laminin gamma2-chain were more pronounced in patients with low interacinar fibrosis. Increases in the protein levels of laminin alpha1 and alpha4 chains were observed in patients with low interacinar fibrosis, but not in those with high interacinar fibrosis. Nidogen mRNA and protein levels were similar in SS patients and controls. Interestingly, high levels of nidogen degradation were observed in patients with low interacinar fibrosis. Nidogens were readily detected by immunofluorescence in the basal lamina of the capillaries and stroma in SS patients, but were less apparent in the basal lamina of the acini and ducts. CONCLUSION These results suggest that the basal lamina of LSGs from patients with SS is undergoing active remodeling, such that alterations are less evident in patients who have advanced morphologic signs of the disease (high interacinar fibrosis). Nidogen proteolysis might account for the disorganization of the basal lamina that is typically observed in LSGs from SS patients, assuming that cleavage impairs their ability to crosslink type IV collagen and laminin networks.
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Abstract
The astacin family (M12A) of the metzincin subclan MA(M) of metalloproteinases has been detected in developing and mature individuals of species that range from hydra to humans. Functions of this family of metalloproteinase vary from digestive degradation of polypeptides, to biosynthetic processing of extracellular proteins, to activation of growth factors. This review will focus on a small subgroup of the astacin family; the bone morphogenetic protein 1 (BMP1)/Tolloid (TLD)-like metalloproteinases. In vertebrates, the BMP1/TLD-like metalloproteinases play key roles in regulating formation of the extracellular matrix (ECM) via biosynthetic processing of various precursor proteins into mature functional enzymes, structural proteins, and proteins involved in initiating mineralization of the ECM of hard tissues. Roles in ECM formation include: processing of the C-propeptides of procollagens types I-III, to yield the major fibrous components of vertebrate ECM; proteolytic activation of the enzyme lysyl oxidase, necessary to formation of covalent cross-links in collagen and elastic fibers; processing of NH2-terminal globular domains and C-propeptides of types V and XI procollagen chains to yield monomers that are incorporated into and control the diameters of collagen type I and II fibrils, respectively; processing of precursors for laminin 5 and collagen type VII, both of which are involved in securing epidermis to underlying dermis; and maturation of small leucine-rich proteoglycans. The BMP1/TLD-related metalloproteinases are also capable of activating the vertebrate transforming growth factor-beta (TGF-beta)-like "chalones" growth differentiation factor 8 (GDF8, also known as myostatin), and GDF11 (also known as BMP11), involved in negative feedback inhibition of muscle and neural tissue growth, respectively; by freeing them from noncovalent latent complexes with their cleaved prodomains. BMP1/TLD-like proteinases also liberate the vertebrate TGF-beta-like morphogens BMP2 and 4 and their invertebrate ortholog decapentaplegic, from latent complexes with the vertebrate extracellular antagonist chordin and its invertebrate ortholog short gastrulation (SOG), respectively. The result is formation of the BMP signaling gradients that form the dorsal-ventral axis in embryogenesis. Thus, BMP1/TLD-like proteinases appear to be key to regulating and orchestrating formation of the ECM and signaling by various TGF-beta-like proteins in morphogenetic and homeostatic events.
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Affiliation(s)
- Gaoxiang Ge
- Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison, Wisconsin 53706, USA
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Spirito F, Capt A, Del Rio M, Larcher F, Guaguere E, Danos O, Meneguzzi G. Sustained phenotypic reversion of junctional epidermolysis bullosa dog keratinocytes: Establishment of an immunocompetent animal model for cutaneous gene therapy. Biochem Biophys Res Commun 2005; 339:769-78. [PMID: 16316622 DOI: 10.1016/j.bbrc.2005.10.216] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2005] [Accepted: 10/21/2005] [Indexed: 01/13/2023]
Abstract
Gene transfer represents the unique therapeutic issue for a number of inherited skin disorders including junctional epidermolysis bullosa (JEB), an untreatable genodermatose caused by mutations in the adhesion ligand laminin 5 (alpha3beta3gamma2) that is secreted in the extracellular matrix by the epidermal basal keratinocytes. Because gene therapy protocols require validation in animal models, we have phenotypically reverted by oncoretroviral transfer of the curative gene the keratinocytes isolated from dogs with a spontaneous form of JEB associated with a genetic mutation in the alpha3 chain of laminin 5. We show that the transduced dog JEB keratinocytes: (1) display a sustained secretion of laminin 5 in the extracellular matrix; (2) recover the adhesion, proliferation, and clonogenic capacity of wild-type keratinocytes; (3) generate fully differentiated stratified epithelia that after grafting on immunocompromised mice produce phenotypically normal skin and sustain permanent expression of the transgene. We validate an animal model that appears particularly suitable to demonstrate feasibility, efficacy, and safety of genetic therapeutic strategies for cutaneous disorders before undertaking human clinical trials.
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45
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Tsubota Y, Yasuda C, Kariya Y, Ogawa T, Hirosaki T, Mizushima H, Miyazaki K. Regulation of biological activity and matrix assembly of laminin-5 by COOH-terminal, LG4-5 domain of alpha3 chain. J Biol Chem 2005; 280:14370-7. [PMID: 15695818 DOI: 10.1074/jbc.m413051200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The basement membrane protein laminin-5 (LN5; alpha3beta3gamma2) undergoes specific proteolytic processing of the 190-kDa alpha3 chain to the 160-kDa form after the secretion, releasing its COOH-terminal, LG4-5 domain. To clarify the biological significance of this processing, we tried to express a recombinant precursor LN5 with a 190-kDa alpha3 chain (pre-LN5), in which the cleavage sequence Gln-Asp was changed to Ala-Ala by point mutation. When the wild-type and mutated LN5 heterotrimers were expressed in HEK293 cells, the wild-type alpha3 chain was completely cleaved, whereas the mutated alpha3 chain was partially cleaved at the same cleavage site (Ala-Ala). pre-LN5 was preferentially deposited on the extracellular matrix, but this deposition was effectively blocked by exogenous heparin. This suggests that interaction between the LG4-5 domain and heparan sulfate proteoglycans on the cell surface and/or extracellular matrix is important in the matrix assembly of LN5. Next, we purified both pre-LN5 and the mature LN5 with the processed, 160-kDa alpha3 chain (mat-LN5) from the conditioned medium of the HEK293 cells and compared their biological activities. mat-LN5 showed higher activities to promote cell adhesion, cell scattering, cell migration, and neurite outgrowth than pre-LN5. These results indicate that the proteolytic removal of LG4-5 from the 190-kDa alpha3 chain converts the precursor LN5 from a less active form to a fully active form. Furthermore, the released LG4-5 fragment stimulated the neurite outgrowth in the presence of mat-LN5, suggesting that LG4-5 synergistically enhances integrin signaling as it is released from the precursor LN5.
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Affiliation(s)
- Yoshiaki Tsubota
- Division of Cell Biology, Kihara Institute for Biological Research, Yokohama City University, Japan
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Capt A, Spirito F, Guaguere E, Spadafora A, Ortonne JP, Meneguzzi G. Inherited junctional epidermolysis bullosa in the German Pointer: establishment of a large animal model. J Invest Dermatol 2005; 124:530-5. [PMID: 15737193 DOI: 10.1111/j.0022-202x.2004.23584.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Junctional epidermolysis bullosa (JEB) is a genodermatosis suitable for gene therapy because conventional treatments are ineffective. Here, we elucidate the genetic basis of mild JEB in a breed of dogs that display all the clinical traits observed in JEB patients. The condition is associated with reduced expression of laminin 5 caused by a homozygous insertion (4818+207ins6.5 kb) of repetitive satellite DNA within intron 35 of the gene (lama3) for the laminin alpha3 chain. The intronic mutation interferes with maturation of the alpha3 pre-messenger RNA resulting in the coexpression of a transcript with a 227 nucleotide insertion and a wild-type mRNA that encodes scant amounts of the alpha3 polypeptide. Our results show that the amino acid sequence and structure of the canine and human alpha3 chain are highly conserved and that the reduced expression of laminin 5 affects the adhesion and clonogenic potential of the JEB keratinocytes. These JEB dogs provide the opportunity to perform gene delivery in a naturally occurring genodermatosis and to evaluate host tolerance to recombinant laminin 5.
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Affiliation(s)
- Annabelle Capt
- INSERM U634, Faculty of Medicine, University Hospital, Nice Cedex, France
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Määttä M, Salo S, Tasanen K, Soini Y, Liakka A, Bruckner-Tuderman L, Autio-Harmainen H. Distribution of basement membrane anchoring molecules in normal and transformed endometrium: altered expression of laminin gamma2 chain and collagen type XVII in endometrial adenocarcinomas. J Mol Histol 2004; 35:715-22. [PMID: 15609083 DOI: 10.1007/s10735-004-1051-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Revised: 02/26/2004] [Indexed: 11/30/2022]
Abstract
Basement membranes (BMs) play an important role in anchoring epithelial cells and separating them from the adjacent stroma. Altered composition and assembly of BMs may influence carcinoma cell growth and invasion. Using immunohistochemistry and in situ hybridization, we investigated the expressions of the BMs components laminin-5 (Ln-5) subunits and collagen types IV, VII and XVII in normal endometrium and compared them to the expression pattern in hyperplastic and neoplastic endometrium. Chains of Ln-5 (alpha3beta3gamma2) and types IV, VII and XVII collagens were observed in normal endometrium. In hyperplastic endometrium, laminin gamma2 chain and type XVII collagen showed intensified expression in foci of dispersed epithelial cells. Individual carcinoma cells in adenocarcinomas of low differentiation grade displayed increased laminin gamma2 chain and type XVII collagen immunoreactivity and mRNA synthesis, whereas type VII collagen usually showed decreased expression. Laminin and type IV collagen showed BM disruptions, especially in tumors with low differentiation. Our results indicate that all the BM anchoring molecules investigated are expressed in normal endometrium, but the expression of laminin gamma2 chain and collagen type XVII is altered in endometrial adenocarcinomas, which support their role in malignant growth.
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Affiliation(s)
- Marko Määttä
- Department of Pathology, University of Oulu, Finland
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Buchroithner B, Klausegger A, Ebschner U, Anton-Lamprecht I, Pohla-Gubo G, Lanschuetzer CM, Laimer M, Hintner H, Bauer JW. Analysis of the LAMB3 gene in a junctional epidermolysis bullosa patient reveals exonic splicing and allele-specific nonsense-mediated mRNA decay. J Transl Med 2004; 84:1279-88. [PMID: 15311214 DOI: 10.1038/labinvest.3700164] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
How splicing, the process of intron removal in pre-messenger RNA (mRNA), is carried out with such fidelity in human cells is still not understood, although some general rules are being proposed mainly by in vitro experiments. These rules are currently being redefined by analysis of splicing mechanisms in patients presenting splicing defects. We analysed material of a patient suffering from junctional epidermolysis bullosa, a heritable blistering skin disease. Absence of laminin-5 protein together with hypoplastic hemidesmosomes at the dermo-epidermal junction in the patient's skin was shown by immunohistochemical analysis and immunoelectron microscopy. Subsequent DNA analysis revealed heterozygosity for the mutations R635X and 3009C-->T in the LAMB3 gene. The latter did not alter codon translation, but introduced an exonic splice site in exon 20. Interestingly, this exonic splice site, which presented a splice score of only 68.6, was preferentially used by the spliceosome over the wild-type splice site at the exon 20-intron 20 border, which showed a splice score of 92.2. LAMB3 mRNA was still detectable in RT-PCR analysis although the aberrantly spliced mRNA leads to a stop codon in exon 21, 5' of the commonly assumed 3' border for nonsense-mediated mRNA decay. These results describe an exception to the proposed rules of pre-mRNA splicing and RNA degradation.
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Affiliation(s)
- Birgit Buchroithner
- Department of Dermatology, Paracelsus Private Medical University of Salzburg, Salzburg, Austria
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Calaluce R, Bearss DJ, Barrera J, Zhao Y, Han H, Beck SK, McDaniel K, Nagle RB. Laminin-5 beta3A expression in LNCaP human prostate carcinoma cells increases cell migration and tumorigenicity. Neoplasia 2004; 6:468-79. [PMID: 15548355 PMCID: PMC1531651 DOI: 10.1593/neo.03499] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2003] [Revised: 05/24/2004] [Accepted: 06/01/2004] [Indexed: 01/13/2023]
Abstract
Interactions between extracellular matrix proteins and prostate carcinoma cells change dramatically during prostate tumor progression. We have concentrated on two key modifications that occur in the hemidesmosome in prostate carcinoma: loss of laminin-5 protein expression and altered basal cell polarity of the alpha6beta4 integrin. We previously demonstrated two cell line-specific isoforms (beta3A and beta3B) of the LAMB3 message. Cells expressing only the beta3B isoform did not translate the beta3 protein and were unable to assemble the laminin-5 trimer. One such cell line, LNCaP, was selected to determine whether restoration of the laminin-5 beta3A isoform would cause expression of a functional laminin-5 beta3 chain, assembly and secretion of the laminin-5 trimer, and reversion to a non-neoplastic phenotype. Laminin-5 beta3A cDNA was cloned and stably transfected into LNCaP cells. We observed the restoration of the beta3 protein, but a laminin-5 trimer was not secreted. Moreover, increased cell migration was demonstrated, and tumorigenicity was increased in SCID mice. A microarray analysis, performed between transfected and nontransfected LNCaP cells, showed most changing genes to be associated with signal transduction. The beta3 chain of laminin-5 may thus play an important role in signal transduction, which may enhance cell motility and tumorigenesis.
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Affiliation(s)
- Robert Calaluce
- Arizona Cancer Center, University of Arizona Health Sciences Center, Tucson, AZ, USA.
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Hintermann E, Quaranta V. Epithelial cell motility on laminin-5: regulation by matrix assembly, proteolysis, integrins and erbB receptors. Matrix Biol 2004; 23:75-85. [PMID: 15246107 DOI: 10.1016/j.matbio.2004.03.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2004] [Accepted: 03/03/2004] [Indexed: 01/10/2023]
Abstract
Cell migration plays a central role in a wide variety of biological events, including embryogenesis, inflammatory immune response, wound healing, or cancer invasion. Tight regulation of cell motility is a prerequisite for normal development and maintenance of an organism, and to avoid metastatic spread of tumor cells. An important determinant of migratory efficiency is the substrate over which a cell migrates. Laminin-5 (Ln-5) is an extracellular matrix component prominent in basement membranes and as such it is a substrate in direct contact with epithelial cells. Interestingly, Ln-5 has been shown to both stimulate and downregulate epithelial cell migration. In this article, we plan to give an overview on the different mechanisms cells employ to regulate their migratory behavior on Ln-5. We will discuss how proteolytic processing of Ln-5 acts as posttranslational modification that plays a major role in the regulation of cell migration. The different proteolytic Ln-5 species may bind to distinct cell surface receptors called integrins, which translate substrate binding into a specific cellular response that triggers cell motility. Furthermore, interaction between Ln-5-binding integrins and other transmembrane and cytoplasmic proteins increases complexity and may allow fine-tuning of cell migration in response to the cellular environment.
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Affiliation(s)
- Edith Hintermann
- Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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