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Yun HY. Leucine rich repeat LGI family member 3: Integrative analyses support its prognostic association with pancreatic adenocarcinoma. Medicine (Baltimore) 2024; 103:e37183. [PMID: 38394487 PMCID: PMC11309673 DOI: 10.1097/md.0000000000037183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 01/17/2024] [Indexed: 02/25/2024] Open
Abstract
Leucine rich repeat LGI family member 3 (LGI3) is a member of the LGI protein family. Previous studies of our group have reported that LGI3 is expressed in adipose tissue, skin and brain, and serves as a multifunctional cytokine. LGI3 may also be involved in cytokine networks in various cancers. This study aimed to analyze differentially expressed genes in pancreatic adenocarcinoma (PAC) tissues and PAC cohort data in order to evaluate the prognostic role of LGI3. The expression microarray and the PAC cohort data were analyzed by bioinformatic methods for differential expression, protein-protein interactions, functional enrichment and pathway analyses, gene co-expression network analysis, and prognostic association analysis. Results showed that LGI3 expression was significantly reduced in PAC tissues. Nineteen upregulated genes and 31 downregulated genes in PAC tissues were identified as LGI3-regulated genes. Protein-protein interaction network analysis demonstrated that 92% (46/50) of the LGI3-regulated genes that were altered in PACs belonged to a protein-protein interaction network cluster. Functional enrichment and gene co-expression network analyses demonstrated that these genes in the network cluster were associated with various processes including inflammatory and immune responses, metabolic processes, cell differentiation, and angiogenesis. PAC cohort analyses revealed that low expression levels of LGI3 were significantly associated with poor PAC prognosis. Analysis of favorable or unfavorable prognostic gene products in PAC showed that 93 LGI3-regulated genes were differentially associated with PAC prognosis. LGI3 expression was correlated with the tumor-infiltration levels of various immune cells. Taken together, these results suggested that LGI3 may be a potential prognostic marker of PAC.
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Affiliation(s)
- Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul, Republic of Korea
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2
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Marafi D, Kozar N, Duan R, Bradley S, Yokochi K, Al Mutairi F, Saadi NW, Whalen S, Brunet T, Kotzaeridou U, Choukair D, Keren B, Nava C, Kato M, Arai H, Froukh T, Faqeih EA, AlAsmari AM, Saleh MM, Pinto e Vairo F, Pichurin PN, Klee EW, Schmitz CT, Grochowski CM, Mitani T, Herman I, Calame DG, Fatih JM, Du H, Coban-Akdemir Z, Pehlivan D, Jhangiani SN, Gibbs RA, Miyatake S, Matsumoto N, Wagstaff LJ, Posey JE, Lupski JR, Meijer D, Wagner M. A reverse genetics and genomics approach to gene paralog function and disease: Myokymia and the juxtaparanode. Am J Hum Genet 2022; 109:1713-1723. [PMID: 35948005 PMCID: PMC9502070 DOI: 10.1016/j.ajhg.2022.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 07/01/2022] [Indexed: 11/16/2022] Open
Abstract
The leucine-rich glioma-inactivated (LGI) family consists of four highly conserved paralogous genes, LGI1-4, that are highly expressed in mammalian central and/or peripheral nervous systems. LGI1 antibodies are detected in subjects with autoimmune limbic encephalitis and peripheral nerve hyperexcitability syndromes (PNHSs) such as Isaacs and Morvan syndromes. Pathogenic variations of LGI1 and LGI4 are associated with neurological disorders as disease traits including familial temporal lobe epilepsy and neurogenic arthrogryposis multiplex congenita 1 with myelin defects, respectively. No human disease has been reported associated with either LGI2 or LGI3. We implemented exome sequencing and family-based genomics to identify individuals with deleterious variants in LGI3 and utilized GeneMatcher to connect practitioners and researchers worldwide to investigate the clinical and electrophysiological phenotype in affected subjects. We also generated Lgi3-null mice and performed peripheral nerve dissection and immunohistochemistry to examine the juxtaparanode LGI3 microarchitecture. As a result, we identified 16 individuals from eight unrelated families with loss-of-function (LoF) bi-allelic variants in LGI3. Deep phenotypic characterization showed LGI3 LoF causes a potentially clinically recognizable PNHS trait characterized by global developmental delay, intellectual disability, distal deformities with diminished reflexes, visible facial myokymia, and distinctive electromyographic features suggestive of motor nerve instability. Lgi3-null mice showed reduced and mis-localized Kv1 channel complexes in myelinated peripheral axons. Our data demonstrate bi-allelic LoF variants in LGI3 cause a clinically distinguishable disease trait of PNHS, most likely caused by disturbed Kv1 channel distribution in the absence of LGI3.
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Affiliation(s)
- Dana Marafi
- Department of Pediatrics, Faculty of Medicine, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Nina Kozar
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Ruizhi Duan
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Stephen Bradley
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Kenji Yokochi
- Department of Pediatrics, Toyohashi Municipal Hospital, Toyohashi, Aichi 441-8570, Japan,Department of Pediatrics, Seirei Mikatahara General Hospital, Shizuoka 433-8558, Japan
| | - Fuad Al Mutairi
- Genetics and Precision Medicine Department, King Abdullah Specialized Children’s Hospital, King Abdulaziz Medical City, Ministry of National Guard Health Affairs, P.O. Box 22490, Riyadh 11426, Kingdom of Saudi Arabia,King Abdullah International Research Center, King Saud Bin Abdulaziz University for Health Sciences, Ministry of National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Nebal Waill Saadi
- College of Medicine, University of Baghdad, Baghdad 10001, Iraq,Children Welfare Teaching Hospital, Medical City Complex, Baghdad 10001, Iraq
| | - Sandra Whalen
- UF de Génétique Clinique et Centre de Reference Anomalies du Développement et Syndromes Malformatifs, APHP, Sorbonne Université, Hôpital Trousseau, 75005 Paris, France
| | - Theresa Brunet
- Institute of Human Genetics, Faculty of Medicine, Technical University Munich, Munich, Germany,Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Urania Kotzaeridou
- Division of Child Neurology and Inherited Metabolic Diseases, Centre for Pediatrics and Adolescent Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Daniela Choukair
- Division of Pediatric Endocrinology, Centre for Pediatrics and Adolescent Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Boris Keren
- Département de Génétique, Hôpital Pitié-Salpêtrière, Assistance Publique - Hôpitaux de Paris, Paris 75013, France
| | - Caroline Nava
- Département de Génétique, Hôpital Pitié-Salpêtrière, Assistance Publique - Hôpitaux de Paris, Paris 75013, France
| | - Mitsuhiro Kato
- Department of Pediatrics, Showa University School of Medicine, Tokyo 142-8666, Japan
| | - Hiroshi Arai
- Department of Pediatric Neurology, Bobath Memorial Hospital, Osaka 536-0023, Japan
| | - Tawfiq Froukh
- Department of Biotechnology and Genetic Engineering, Philadelphia University, Amman, Jordan
| | - Eissa Ali Faqeih
- Section of Medical Genetics, King Fahad Medical City, Children’s Specialist Hospital, Riyadh, Saudi Arabia
| | - Ali M. AlAsmari
- Section of Medical Genetics, King Fahad Medical City, Children’s Specialist Hospital, Riyadh, Saudi Arabia
| | - Mohammed M. Saleh
- Section of Medical Genetics, King Fahad Medical City, Children’s Specialist Hospital, Riyadh, Saudi Arabia
| | - Filippo Pinto e Vairo
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA,Department of Clinical Genomics, Mayo Clinic, Rochester, MN, USA
| | | | - Eric W. Klee
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, USA,Department of Clinical Genomics, Mayo Clinic, Rochester, MN, USA,Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
| | | | | | - Tadahiro Mitani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Isabella Herman
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Section of Pediatric Neurology and Developmental Neuroscience, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA,Texas Children’s Hospital, Houston, TX 77030, USA
| | - Daniel G. Calame
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Section of Pediatric Neurology and Developmental Neuroscience, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA,Texas Children’s Hospital, Houston, TX 77030, USA
| | - Jawid M. Fatih
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Haowei Du
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Zeynep Coban-Akdemir
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Human Genetics Center, Department of Epidemiology, Human Genetics, and Environmental Sciences, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Davut Pehlivan
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Section of Pediatric Neurology and Developmental Neuroscience, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA,Texas Children’s Hospital, Houston, TX 77030, USA
| | - Shalini N. Jhangiani
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Richard A. Gibbs
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA
| | - Satoko Miyatake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa 236-0004, Japan,Clinical Genetics Department, Yokohama City University Hospital, Yokohama, Kanagawa 236-0004, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa 236-0004, Japan
| | - Laura J. Wagstaff
- Centre for Regenerative Medicine, Institute for Regeneration and Repair, University of Edinburgh, Edinburgh, UK
| | - Jennifer E. Posey
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - James R. Lupski
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA,Texas Children’s Hospital, Houston, TX 77030, USA,Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX 77030, USA,Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA,Corresponding author
| | - Dies Meijer
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK.
| | - Matias Wagner
- Institute for Neurogenomics, Helmholtz Zentrum München, Neuherberg, Germany,Institute of Human Genetics, Technical University Munich, Munich, Germany
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Kim HA, Baek KJ, Yun HY. Integrative proteomic network analyses support depot-specific roles for leucine rich repeat LGI family member 3 in adipose tissues. Exp Ther Med 2021; 22:837. [PMID: 34149883 PMCID: PMC8200805 DOI: 10.3892/etm.2021.10269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 05/12/2021] [Indexed: 12/14/2022] Open
Abstract
LGI family member 3 (LGI3) is a member of the LGI protein family. In our previous studies, LGI3 was determined to be expressed in adipose tissues, skin and the brain, where it served as a pleiotropic cytokine. The results indicated that LGI3 levels are increased in adipose tissues of obese individuals in comparison with control individuals and that LGI3 suppressed adipogenesis via its receptor, disintegrin and metalloproteinase domain-containing protein 23. Additionally, it was reported that LGI3 upregulates tumor necrosis factor-α and downregulated adiponectin and hypothesized that LGI3 may act as a proinflammatory adipokine involved in adipose tissue inflammation. In the present study, cytokine arrays were used to analyze cytokine levels in adipose tissues and plasma of LGI3-knockout mice and signaling protein arrays used to analyze the expression and phosphorylation of these proteins in LGI3-treated preadipocytes. The results suggested that expression levels of 129 gene products (24 cytokines and 105 signaling proteins) were altered in response to LGI3 deficiency or LGI3 treatment, respectively. Protein-protein interaction network analysis of LGI3-regulated gene products revealed that 94% of the gene products (21 cytokines and 100 signaling proteins) formed an interaction network cluster. Functional enrichment analysis for the LGI3-regulated gene products, including those from our previous studies, revealed an association with numerous biological processes, including inflammatory responses, cellular differentiation and development and metabolic regulation. Gene co-expression network analysis revealed that these LGI3-regulated gene products were involved in various biological processes in an overlapping and differential manner between subcutaneous and visceral adipose tissues. Notably, inflammatory responses were more strongly associated with the LGI3-regulated gene co-expression network in visceral adipose tissues than in subcutaneous adipose tissues. Analysis of expression quantitative trait loci identified four single nucleotide variants that affect expression of LGI3 in an adipose depot-specific manner. Taken together, the results suggested that LGI3 may serve depot-specific roles as an adipokine in adipose tissues.
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Affiliation(s)
- Hyun A Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Kwang Jin Baek
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
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8p21.3 deletions are rare causes of non-syndromic autism spectrum disorder. Neurogenetics 2021; 22:207-213. [PMID: 33683518 DOI: 10.1007/s10048-021-00635-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 02/23/2021] [Indexed: 10/22/2022]
Abstract
A de novo 0.95 Mb 8p21.3 deletion had been identified in an individual with non-syndromic autism spectrum disorder (ASD) through high-resolution copy number variant analysis. Subsequent screening of in-house and publicly available databases resulted in the identification of six additional individuals with 8p21.3 deletions. Through case-based reasoning, we conclude that 8p21.3 deletions are rare causes of non-syndromic neurodevelopmental and neuropsychiatric disorders. Based on literature data, we highlight six genes within the region of minimal overlap as potential ASD genes or genes for neuropsychiatric disorders: DMTN, EGR3, FGF17, LGI3, PHYHIP, and PPP3CC.
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Kim US, Park JW, Park ES, Bang JS, Jung TW, Kim DS, Abd El-Aty AM, Lee JH, Jeong JH. The Suppressive Effect of Leucine-Rich Glioma Inactivated 3 (LGI3) Peptide on Impaired Skin Barrier Function in a Murine Model Atopic Dermatitis. Pharmaceutics 2020; 12:pharmaceutics12080750. [PMID: 32785038 PMCID: PMC7463480 DOI: 10.3390/pharmaceutics12080750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/03/2020] [Accepted: 08/08/2020] [Indexed: 11/16/2022] Open
Abstract
This study aimed to restore the skin barrier function from atopic dermatitis (AD) via treatment with leucine-rich glioma inactivated 3 (LGI3) peptide. Male NC/Nga mice (7 weeks, 20 g) were randomly allocated into three groups (control, AD, and LGI3 group). After induction of AD skin lesions with Dermatophagoides farinae ointment, mice were treated with LGI3. The clinical score of AD was the highest and the dorsal skin thickness was the thickest in the AD group. In contrast, LGI3 treatment improved the clinical score and the dorsal skin thickness compared to the AD model. LGI3 treatment suppressed histopathological thickness of the epithelial cell layer of the dorsal skin. LGI3 treatment could indirectly reduce mast cell infiltration through restoring the barrier function of the skin. Additionally, the filaggrin expression was increased in immunohistochemical evaluation. In conclusion, the ameliorating effect and maintaining skin barrier homeostasis in the AD murine model treated with LGI3 could be attributed to complete re-epithelialization of keratinocytes. Hence, LGI3 might be considered as a new potential therapeutic target for restoring skin barrier function in AD.
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Affiliation(s)
- Ui Seok Kim
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Korea; (U.S.K.); (J.W.P.); (T.W.J.)
| | - Jin Woo Park
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Korea; (U.S.K.); (J.W.P.); (T.W.J.)
| | - Eon Sub Park
- Department of Pathology, College of Medicine, Chung-Ang University, Seoul 06974, Korea;
| | - Joon Seok Bang
- College of Pharmacy, Sookmyung Women’s University, Seoul 04310, Korea;
| | - Tae Woo Jung
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Korea; (U.S.K.); (J.W.P.); (T.W.J.)
| | - Dong-Seok Kim
- Department of Biochemistry, College of Medicine, Chung-Ang University, Seoul 06974, Korea;
| | - A. M. Abd El-Aty
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt;
| | - Jong Hyuk Lee
- Department of Pharmaceutical Engineering, College of Life and Health Science, Hoseo University, Asan 31499, Korea
- Correspondence: (J.H.L.); (J.H.J.); Tel.: +82-41-540-9814 (J.H.L.); +82-2-820-5688 (J.H.J.)
| | - Ji Hoon Jeong
- Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 06974, Korea; (U.S.K.); (J.W.P.); (T.W.J.)
- Correspondence: (J.H.L.); (J.H.J.); Tel.: +82-41-540-9814 (J.H.L.); +82-2-820-5688 (J.H.J.)
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Farag AGA, Hammam MA, Al-Sharaky DR, El-Boghdady GM. Leucine-rich glioma inactivated 3: a novel keratinocyte-derived melanogenic cytokine in vitiligo patients. An Bras Dermatol 2019; 94:434-441. [PMID: 31644616 PMCID: PMC7007044 DOI: 10.1590/abd1806-4841.20198250] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/14/2018] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND In-vitro studies showed that Leucine-rich glioma inactivated 3 (LGI3) is a keratinocyte-derived cytokine that stimulates melanin synthesis and is increased after ultra violet B (UVB) irradiation. So, we postulated that LGI3 may be involved in vitiligo aetiopathogenesis and may participate in narrow band ultra violet B (NB-UVB) induced pigmentation in vitiligo. OBJECTIVES To assess this hypothesis, lesional LGI3 immunohistochemical expression of vitiligo patients before and after NB-UVB phototherapy was studied, and its correlation with repigmentation was evaluated. METHODS Forty vitiligo patients and 20 age, sex, and skin phenotype-matched controls were enrolled. Patients were treated with NB-UVB thrice weekly for 12 weeks. VASI score was evaluated before and after NB-UVB sessions. For vitiligo patients, baseline LGI3 immunohistochemical staining was estimated, and compared to that of controls and to its post-treatment data in those patients. Results: Baseline LGI3 immunohistochemical studied parameters (expression, intensity, percentage and H score) were significantly lower in vitiligo cases than controls (p=0.003, 0.013, 0.001 and 0.001 respectively). After 12 weeks of NB-UVB phototherapy, these LGI3 immunohistochemical parameters were up-regulated and became comparable to that of controls (p >0.05 for all). There was a significant positive correlation between the improvement of both VASI score and LGI3 H score mean values (r=-0.349 , p=0.027). STUDY LIMITATIONS Small number of investigated subjects. CONCLUSIONS Decreased LGI3 protein may play an active role in vitiligo pathogenesis and its up-regulation after NB-UVB phototherapy, may actively participate in NB-UVB photo-induced melanogenesis.
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Affiliation(s)
- Azza Gaber Antar Farag
- Department of Dermatology, Department of Andrology, and STDs, Faculty of Medicine, Menoufia University, Shebin El Kom, Egypt
| | - Mostafa Ahmed Hammam
- Discipline of Dermatology, Department of Dermatology, Department of Andrology, and STDs, Faculty of Medicine, Menoufia University, Shebin El Kom, Egypt
| | | | - Ghada Mohamed El-Boghdady
- Department of Dermatology, Department of Andrology, and STDs, Faculty of Medicine, Menoufia University, Shebin El Kom, Egypt
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Lee SH, Kwon NS, Baek KJ, Yun HY, Kim DS. LGI3 is secreted and binds to ADAM22 via TRIF-dependent NF-κB pathway in response to LPS in human keratinocytes. Cytokine 2019; 126:154872. [PMID: 31627033 DOI: 10.1016/j.cyto.2019.154872] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/30/2019] [Accepted: 09/30/2019] [Indexed: 12/30/2022]
Abstract
Recently, we reported that HaCaT human keratinocytes secreted leucine-rich repeat LGI family member 3 (LGI3) protein after exposure to ultraviolet B (UVB) irradiation. In the present study, we aimed to determine whether LGI3 is also released in response to stimulation by lipopolysaccharides (LPS), membrane components of gram-negative bacteria. Our results showed that LGI3 was indeed secreted by LPS-stimulated HaCaT cells. We also found that LPS potently stimulated the induction of cycloxygenase-2 (COX-2), which is involved in the inflammatory response. In addition, LPS-induced LGI3 secretion and COX-2 expression were blocked by NS-398, a selective COX-2 inhibitor. Moreover, LPS activated nuclear factor-κB (NF-κB) via a TRIF-dependent pathway, and activated NF-κB led to LGI3 production in HaCaT cells. For the first time, we predicted the LGI3 promoter sequence and demonstrated that NF-κB bound to the LGI3 gene promoter region. LPS treatment also increased the expression of a disintegrin and metalloproteinase domain-containing protein 22 (ADAM22), a candidate LGI3 receptor. Furthermore, co-immunoprecipitation, flow cytometry, and immunocytochemistry revealed that LGI3 associated with ADAM22 in LPS-treated keratinocytes. Thus, ADAM22 may be an LGI3 receptor in human keratinocytes. Taken together, these data suggest that the TRIF-dependent pathway is a novel regulator of LGI3 secretion in response to LPS stimulation in HaCaT cells and that keratinocyte-derived LGI3 interacts with ADAM22 and mediates LPS-induced inflammation.
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Affiliation(s)
- Seung Hoon Lee
- Department of Biochemistry, Chung-Ang University College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, South Korea
| | - Nyoun Soo Kwon
- Department of Biochemistry, Chung-Ang University College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, South Korea
| | - Kwang Jin Baek
- Department of Biochemistry, Chung-Ang University College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, South Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, South Korea
| | - Dong-Seok Kim
- Department of Biochemistry, Chung-Ang University College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, South Korea.
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8
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Kim DS, Kwon NS, Yun HY. Leucine rich repeat LGI family member 3: Integrative analyses reveal its prognostic association with non-small cell lung cancer. Oncol Lett 2019; 18:3388-3398. [PMID: 31452819 PMCID: PMC6704323 DOI: 10.3892/ol.2019.10648] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 06/21/2019] [Indexed: 12/25/2022] Open
Abstract
Leucine rich repeat LGI family member 3 (LGI3) is a member of the LGI protein family. Our previous studies reported that LGI3 was expressed in adipose tissues, brain and skin, where it served roles as a multifunctional cytokine and pro-inflammatory adipokine. It was hypothesized that LGI3 may be involved in cytokine networks in cancer. The present study aimed to analyze differentially expressed genes in non-small cell lung cancer (NSCLC) tissues and NSCLC cohort data, to evaluate the prognostic role of LGI3. Expression microarray and NSCLC cohort data were statistically analyzed by bioinformatic methods, and protein-protein interactions, functional enrichment and pathway, gene coexpression network (GCN) and prognostic association analyses were performed. The results demonstrated that the expression levels of LGI3 and its receptor a disintegrin and metalloproteinase domain-containing protein 22 were significantly decreased in NSCLC tissues. A total of two upregulated genes and 11 downregulated genes in NSCLC tissues were identified as LGI3-regulated genes. Protein-protein interaction network analysis demonstrated that all LGI3-regulated genes that were altered in NSCLC were involved in a protein-protein interaction network cluster. Functional enrichment, Kyoto Encyclopedia of Genes and Genomes pathway and GCN analyses demonstrated the association of these genes with the immune and inflammatory responses, angiogenesis, the tumor necrosis factor pathway, and chemokine and peroxisome proliferator-activated receptor signaling pathways. Analysis of NSCLC cohorts revealed that low expression levels of LGI3 was significantly associated with poor prognosis of NSCLC. Analysis of the somatic mutations of the LGI3 gene in NSCLC revealed that the amino acid residues altered in NSCLC included two single nucleotide polymorphism sites and three phylogenetically coevolved amino acid residues. Taken together, these results suggest that LGI3 may be a potential prognostic marker of NSCLC.
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Affiliation(s)
- Dong-Seok Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Nyoun Soo Kwon
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
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9
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Kim IW, Jeong HS, Kwon NS, Baek KJ, Yun HY, Kim DS. LGI3 promotes human keratinocyte differentiation via the Akt pathway. Exp Dermatol 2018; 27:1224-1229. [DOI: 10.1111/exd.13766] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 07/23/2018] [Accepted: 08/06/2018] [Indexed: 01/01/2023]
Affiliation(s)
- In Wook Kim
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
| | - Hyo-Soon Jeong
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
| | - Nyoun Soo Kwon
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
| | - Kwang Jin Baek
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
| | - Hye-Young Yun
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
| | - Dong-Seok Kim
- Department of Biochemistry; Chung-Ang University College of Medicine; Seoul Korea
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Gerhardt B, Leesman L, Burra K, Snowball J, Rosenzweig R, Guzman N, Ambalavanan M, Sinner D. Notum attenuates Wnt/β-catenin signaling to promote tracheal cartilage patterning. Dev Biol 2018; 436:14-27. [PMID: 29428562 DOI: 10.1016/j.ydbio.2018.02.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 02/05/2018] [Accepted: 02/05/2018] [Indexed: 12/20/2022]
Abstract
Tracheobronchomalacia (TBM) is a common congenital disorder in which the cartilaginous rings of the trachea are weakened or missing. Despite the high prevalence and clinical issues associated with TBM, the etiology is largely unknown. Our previous studies demonstrated that Wntless (Wls) and its associated Wnt pathways are critical for patterning of the upper airways. Deletion of Wls in respiratory endoderm caused TBM and ectopic trachealis muscle. To understand mechanisms by which Wls mediates tracheal patterning, we performed RNA sequencing in prechondrogenic tracheal tissue of Wlsf/f;ShhCre/wt embryos. Chondrogenic Bmp4, and Sox9 were decreased, while expression of myogenic genes was increased. We identified Notum, a deacylase that inactivates Wnt ligands, as a target of Wls induced Wnt signaling. Notum's mesenchymal ventral expression in prechondrogenic trachea overlaps with expression of Axin2, a Wnt/β-catenin target and inhibitor. Notum is induced by Wnt/β-catenin in developing trachea. Deletion of Notum activated mesenchymal Wnt/β-catenin and caused tracheal mispatterning of trachealis muscle and cartilage as well as tracheal stenosis. Notum is required for tracheal morphogenesis, influencing mesenchymal condensations critical for patterning of tracheal cartilage and muscle. We propose that Notum influences mesenchymal cell differentiation by generating a barrier for Wnt ligands produced and secreted by airway epithelial cells to attenuate Wnt signaling.
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Affiliation(s)
- Bradley Gerhardt
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Lauren Leesman
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Kaulini Burra
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - John Snowball
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Rachel Rosenzweig
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Natalie Guzman
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Manoj Ambalavanan
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
| | - Debora Sinner
- Division of Neonatology and Pulmonary Biology, CCHMC, University of Cincinnati, College of Medicine and University Honors Program, Cincinnati, OH 45229, United States of America
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Kwon N, Baek K, Kim D, Yun H. Leucine-rich glioma inactivated 3: Integrative analyses reveal its potential prognostic role in cancer. Mol Med Rep 2017; 17:3993-4002. [DOI: 10.3892/mmr.2017.8279] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 07/25/2017] [Indexed: 11/06/2022] Open
Affiliation(s)
- Nyoun Kwon
- Department of Biochemistry, Chung‑Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Kwang Baek
- Department of Biochemistry, Chung‑Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Dong‑Seok Kim
- Department of Biochemistry, Chung‑Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Hye‑Young Yun
- Department of Biochemistry, Chung‑Ang University, College of Medicine, Seoul 06974, Republic of Korea
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Yu Y, Hasegawa D, Fujiwara-Igarashi A, Hamamoto Y, Mizoguchi S, Kuwabara T, Fujita M. Molecular cloning and characterization of the family of feline leucine-rich glioma-inactivated (LGI) genes, and mutational analysis in familial spontaneous epileptic cats. BMC Vet Res 2017; 13:389. [PMID: 29237452 PMCID: PMC5729232 DOI: 10.1186/s12917-017-1308-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 11/28/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Leucine-rich glioma-inactivated (LGI) proteins play a critical role in synaptic transmission. Dysfunction of these genes and encoded proteins is associated with neurological disorders such as genetic epilepsy or autoimmune limbic encephalitis in animals and human. Familial spontaneous epileptic cats (FSECs) are the only feline strain and animal model of familial temporal lobe epilepsy. The seizure semiology of FSECs comprises recurrent limbic seizures with or without evolution into generalized epileptic seizures, while cats with antibodies against voltage-gated potassium channel complexed/LGI1 show limbic encephalitis and recurrent limbic seizures. However, it remains unclear whether the genetics underlying FSECs are associated with LGI family genes. In the present study, we cloned and characterized the feline LGI1-4 genes and examined their association with FSECs. Conventional PCR techniques were performed for cloning and mutational analysis. Characterization was predicted using bioinformatics software. RESULTS The cDNAs of feline LGI1-4 contained 1674-bp, 1650-bp, 1647-bp, and 1617-bp open reading frames, respectively, and encoded proteins comprising 557, 549, 548, and 538 amino acid residues, respectively. The feline LGI1-4 putative protein sequences showed high homology with Homo sapiens, Canis familiaris, Bos taurus, Sus scrofa, and Equus caballus (92%-100%). Mutational analysis in 8 FSECs and 8 controls for LGI family genes revealed 3 non-synonymous and 14 synonymous single nucleotide polymorphisms in the coding region. Only one non-synonymous single nucleotide polymorphism in LGI4 was found in 3 out of 8 FSECs. Using three separate computational tools, this mutation was not predicted to be disease causing. No co-segregation of the disease was found with any variant. CONCLUSIONS We cloned the cDNAs of the four feline LGI genes, analyzed the amino acid sequences, and revealed that epilepsy in FSEC is not a monogenic disorder associated with LGI genes.
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Affiliation(s)
- Yoshihiko Yu
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan.
| | - Daisuke Hasegawa
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan.
| | - Aki Fujiwara-Igarashi
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Yuji Hamamoto
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Shunta Mizoguchi
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Takayuki Kuwabara
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Michio Fujita
- Department of Clinical Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, 180-8602, Japan
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13
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Kwon NS, Kim DS, Yun HY. Leucine-rich glioma inactivated 3: integrative analyses support its prognostic role in glioma. Onco Targets Ther 2017; 10:2721-2728. [PMID: 28579810 PMCID: PMC5449096 DOI: 10.2147/ott.s138912] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background Leucine-rich glioma inactivated 3 (LGI3) is a secreted protein member of LGI family. We previously reported that LGI3 was expressed in brain, adipose tissues and skin, where it played roles as a multifunctional cytokine. We postulated that LGI3 may be involved in cytokine network in cancers. Aim This study aimed to analyze differentially expressed genes in glioma tissues and glioma cohort data to investigate the prognostic role of LGI3 and its receptors. Materials and methods Expression microarray data from Gene Expression Omnibus and glioma cohort data were analyzed using bioinformatic tools for statistical analysis, protein–protein interactions, functional enrichment and pathway analyses and prognostic association analysis. Results We found that LGI3 and its receptors, ADAM22 and ADAM23, were significantly downregulated in glioma tissues. Eleven upregulated genes and two downregulated genes in glioma tissues were found to be the previously reported LGI3-regulated genes. Protein–protein interaction network analysis showed that 85% of the LGI3-regulated and glioma-altered genes formed a cluster of interaction network. Functional enrichment and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses revealed the association of these genes with hypoxia responses, p53 and Akt signaling and various cancer-related pathways including glioma. Analysis of expression microarray data of glioma cohorts demonstrated that low expression levels of LGI3, ADAM22 and ADAM23 were significantly associated with poor prognosis of glioma. Conclusion These results propose that LGI3 and its receptors may play a prognostic role in glioma.
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Affiliation(s)
- Nyoun Soo Kwon
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul, Republic of Korea
| | - Dong-Seok Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul, Republic of Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul, Republic of Korea
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Kim HA, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-rich glioma inactivated 3: Integrative analyses support its role in the cytokine network. Int J Mol Med 2017; 40:251-259. [PMID: 28534931 DOI: 10.3892/ijmm.2017.2988] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 05/08/2017] [Indexed: 11/05/2022] Open
Abstract
Leucine-rich glioma inactivated (LGI)3 is a secreted protein member of LGI family. We previously repo-rted that LGI3 was upregulated in adipose tissues from obese mice and suppressed adipogenesis through its receptor, a disintegrin and metalloproteinase domain-containing protein 23 (ADAM23). We demonstrated that LGI3 regulated tumor necrosis factor-α and adiponectin, and proposed that LGI3 may be a pro-inflammatory adipokine involved in adipose tissue inflammation. In this study, we analyzed adipokine and cytokine profiles in LGI3 knockout mice and demonstrated that multiple factors were increased or decreased in the adipose tissues and plasma of the LGI3 knockout mice. Phosphoprotein array analysis revealed increases in the phosphorylation levels of Akt, AMP-activated protein kinase (AMPK), Bad, extracellular signal-regulated kinase (Erk)1/2, glycogen synthase kinase 3α (GSK3α), phosphatase and tensin homolog (PTEN) and eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) in the LGI3-treated 3T3-L1 pre-adipocytes. Treatment with LGI3 increased the expression of various inflammatory genes in pre-adipocytes, adipocytes and macrophages. Integrative functional enrichment analysis for all LGI3-regulated gene products suggested their involvement in a number of biological processes, including cancer, inflammatory response, response to wounding, as well as cell proliferation and differentiation. Protein interaction network analysis of LGI3‑regulated gene products revealed that 94% of the gene products formed a cluster of interaction networks. Taken together, these results support the critical involvement of LGI3 in the cytokine network by interplaying with multiple adipokines, cytokines and signaling proteins.
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Affiliation(s)
- Hyun A Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Nyoun Soo Kwon
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Kwang Jin Baek
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Dong-Seok Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, Seoul 06974, Republic of Korea
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15
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Kim HA, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-rich glioma inactivated 3 and tumor necrosis factor-α regulate mutually through NF-κB. Cytokine 2015; 72:220-3. [PMID: 25648289 DOI: 10.1016/j.cyto.2014.12.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 12/17/2014] [Accepted: 12/23/2014] [Indexed: 10/24/2022]
Abstract
Leucine-rich glioma inactivated 3 (LGI3) is a secreted protein member of LGI family. We previously reported that LGI3 increased in obese adipose tissues and suppressed adipogenesis through its receptor, ADAM23. We proposed that LGI3 may be a pro-inflammatory adipokine secreted predominantly by preadipocytes and macrophages. In this study, we showed that LGI3 and tumor necrosis factor-α (TNF-α) upregulated each other in 3T3-L1 cells. Treatment of 3T3-L1 preadipocytes with LGI3 protein increased TNF-α mRNA and protein. LGI3 treatment led to NF-κB activation and binding to an NF-κB binding site (-523 to -514) in TNF-α promoter. TNF-α treatment increased mRNA and protein expression of LGI3 and ADAM23. TNF-α increased NF-κB binding to a predicted binding site (-40 to -31) in LGI3 promoter. High fat diet-fed mice showed that LGI3 and TNF-α were increased and colocalized in adipose tissue inflammation. Taken together, these results suggested that mutual upregulation of LGI3 and TNF-α may play a role in adipose tissue inflammation in obesity.
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Affiliation(s)
- Hyun A Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea
| | - Nyoun Soo Kwon
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea
| | - Kwang Jin Baek
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea
| | - Dong-Seok Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea
| | - Hye-Young Yun
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea.
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16
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Jeong YM, Park WJ, Kim MK, Baek KJ, Kwon NS, Yun HY, Kim DS. Leucine-rich glioma inactivated 3 promotes HaCaT keratinocyte migration. Wound Repair Regen 2014; 21:634-40. [PMID: 23815230 DOI: 10.1111/wrr.12066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 04/30/2013] [Indexed: 12/24/2022]
Abstract
Our finding that human skin expresses leucine-rich glioma inactivated 3 (LGI3) raises the question of the function of this cytokine in keratinocytes. We have shown that LGI3 stimulates human HaCaT keratinocyte migration without affecting viability or proliferation. Western blot analysis showed that LGI3 induced focal adhesion kinase activation, Akt phosphorylation, and glycogen synthase kinase 3β (GSK3β) phosphorylation in these cells. Using the scratch wound assay and a modified Boyden chamber, we found that LY294002, a selective phosphatidylinositol 3-kinase inhibitor, and LiCl, a selective GSK3β inhibitor, abolished LGI3-induced cell migration. We tested β-catenin levels after LGI3 treatment because the Akt-GSK3β pathway regulates β-catenin accumulation, and β-catenin promotes cell migration. LGI3 treatment increased β-catenin protein and nuclear localization, whereas LY294002 prevented LGI3-induced focal adhesion kinase and Akt activation as well as β-catenin accumulation. Overall, these data suggest that LGI3 stimulates HaCaT cell migration following β-catenin accumulation through the Akt pathway.
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Affiliation(s)
- Yun-Mi Jeong
- Department of Biochemistry, Chung-Ang University College of Medicine, Seoul, Korea
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Abstract
The development and function of the vertebrate nervous system depend on specific interactions between different cell types. Two examples of such interactions are synaptic transmission and myelination. LGI1-4 (leucine-rich glioma inactivated proteins) play important roles in these processes. They are secreted proteins consisting of an LRR (leucine-rich repeat) domain and a so-called epilepsy-associated or EPTP (epitempin) domain. Both domains are thought to function in protein–protein interactions. The first LGI gene to be identified, LGI1, was found at a chromosomal translocation breakpoint in a glioma cell line. It was subsequently found mutated in ADLTE (autosomal dominant lateral temporal (lobe) epilepsy) also referred to as ADPEAF (autosomal dominant partial epilepsy with auditory features). LGI1 protein appears to act at synapses and antibodies against LGI1 may cause the autoimmune disorder limbic encephalitis. A similar function in synaptic remodelling has been suggested for LGI2, which is mutated in canine Benign Familial Juvenile Epilepsy. LGI4 is required for proliferation of glia in the peripheral nervous system and binds to a neuronal receptor, ADAM22, to foster ensheathment and myelination of axons by Schwann cells. Thus, LGI proteins play crucial roles in nervous system development and function and their study is highly important, both to understand their biological functions and for their therapeutic potential. Here, we review our current knowledge about this important family of proteins, and the progress made towards understanding their functions.
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Kim HA, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-rich glioma inactivated 3 associates negatively with adiponectin. Cytokine 2013; 62:206-9. [PMID: 23548727 DOI: 10.1016/j.cyto.2013.03.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 03/03/2013] [Accepted: 03/08/2013] [Indexed: 01/25/2023]
Abstract
Leucine-rich glioma inactivated 3 (LGI3) is a secreted protein member of LGI/epitempin family. We previously reported that LGI3 was expressed in adipose tissues and suppressed adipogenesis through its receptor, ADAM23. We proposed that LGI3 may be a candidate adipokine with pro-inflammatory activity. To investigate the role of LGI3 in adipose tissues, we analyzed cytokine profile in LGI3 knockout mice. Protein array analysis showed that adiponectin was significantly increased in adipose tissues and plasma of LGI3 knockout mice. SiRNA-mediated knockdown of LGI3 increased adiponectin in 3T3-L1 preadipocytes. Treatment of differentiating 3T3-L1 cells with LGI3 protein decreased adiponectin in a dose-dependent manner. High fat diet (HFD)-fed mice showed expression of LGI3 in adipose tissue macrophages in addition to adipocytes that expressed LGI3 in both normal chow-fed and HFD-fed mice. The 60-kDa LGI3 was selectively increased in adipose tissues of HFD mice in which adiponectin was downregulated. Taken together, these results suggested that LGI3 may participate in adipose tissue homeostasis by negatively regulating adiponectin.
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Affiliation(s)
- Hyun A Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Dongjak-gu, Seoul 156-861, Republic of Korea
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Lee SH, Jeong YM, Kim SY, Jeong HS, Park KC, Baek KJ, Kwon NS, Yun HY, Kim DS. Ultraviolet B-induced LGI3 secretion protects human keratinocytes. Exp Dermatol 2012; 21:716-8. [PMID: 22741557 DOI: 10.1111/j.1600-0625.2012.01550.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/04/2012] [Indexed: 01/02/2023]
Abstract
Leucine-rich glioma inactivated 3 (LGI3) is known to be expressed mainly in the brain. However, the expression and physiological roles of LGI3 in skin cells remain unknown. In this study, it was found for the first time that LGI3 is expressed mostly by normal human keratinocytes. Furthermore, ELISA analysis showed that HaCaT human keratinocytes increased LGI3 secretion after exposure to ultraviolet B (UVB) in a time- and dose-dependent manner. We next investigated the possible role of LGI3 in keratinocytes. LGI3 (50 ng/ml) increased survival of HaCaT cells by 20% after UVB irradiation (150 mJ/cm(2) ). It was also found that LGI3 stimulates the phosphorylation of Akt, which is involved in the cell survival-signalling cascade. Furthermore, LGI3 led to the phosphorylation of MDM2 and subsequent p53 degradation. Taken together, the data suggest that LGI3 may regulate p53 levels and that keratinocyte-derived LGI3 may act as a novel cytokine for skin homoeostasis.
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Affiliation(s)
- Seung Hoon Lee
- Department of Biochemistry, Chung-Ang University College of Medicine, Dongjak-gu, Seoul, Republic of Korea
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Kim HA, Park WJ, Jeong HS, Lee HE, Lee SH, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-rich glioma inactivated 3 regulates adipogenesis through ADAM23. Biochim Biophys Acta Mol Cell Biol Lipids 2012; 1821:914-22. [PMID: 22405860 DOI: 10.1016/j.bbalip.2012.02.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 02/10/2012] [Accepted: 02/15/2012] [Indexed: 12/19/2022]
Abstract
Leucine-rich glioma inactivated 3 (LGI3) is a secreted protein and a member of LGI/epitempin family. We previously showed that LGI3 was highly expressed in brain and played regulatory roles in neuronal exocytosis and differentiation. Besides the nervous system, LGI3 was shown to be expressed in diverse tissues. In this study, we found that LGI3 and its receptor candidate ADAM23 were expressed in adipose tissues and 3T3-L1 cells. 3T3-L1 preadipocytes secreted a 60-kDa protein, a major secreted form of LGI3, which declined with adipocyte differentiation. LGI3 was also expressed in adipose tissue macrophages in the ob/ob mice and in macrophage cell line. The 60-kDa LGI3 protein was selectively increased in the ob/ob adipose tissues comparing with the lean mice. Pull-down experiments, coimmunoprecipitation and immunocytochemistry indicated that LGI3 associated with ADAM23 in adipose tissues and 3T3-L1 cells. Knockdown of LGI3 or ADAM23 by siRNA increased adipogenesis in 3T3-L1 cells. Treatment with LGI3 protein did not affect preadipocyte proliferation but attenuated adipogenesis and this effect was reversed by siRNA-mediated knockdown of ADAM23. Taken together, we propose that LGI3 may be a candidate adipokine that is perturbed in obesity and suppresses adipogenesis through its receptor, ADAM23.
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Affiliation(s)
- Hyun A Kim
- Department of Biochemistry, Chung-Ang University, College of Medicine, 84 Heukseok-ro, Seoul 156-861, Republic of Korea
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Seppälä EH, Jokinen TS, Fukata M, Fukata Y, Webster MT, Karlsson EK, Kilpinen SK, Steffen F, Dietschi E, Leeb T, Eklund R, Zhao X, Rilstone JJ, Lindblad-Toh K, Minassian BA, Lohi H. LGI2 truncation causes a remitting focal epilepsy in dogs. PLoS Genet 2011; 7:e1002194. [PMID: 21829378 PMCID: PMC3145619 DOI: 10.1371/journal.pgen.1002194] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Accepted: 06/05/2011] [Indexed: 12/17/2022] Open
Abstract
One quadrillion synapses are laid in the first two years of postnatal construction of the human brain, which are then pruned until age 10 to 500 trillion synapses composing the final network. Genetic epilepsies are the most common neurological diseases with onset during pruning, affecting 0.5% of 2–10-year-old children, and these epilepsies are often characterized by spontaneous remission. We previously described a remitting epilepsy in the Lagotto romagnolo canine breed. Here, we identify the gene defect and affected neurochemical pathway. We reconstructed a large Lagotto pedigree of around 34 affected animals. Using genome-wide association in 11 discordant sib-pairs from this pedigree, we mapped the disease locus to a 1.7 Mb region of homozygosity in chromosome 3 where we identified a protein-truncating mutation in the Lgi2 gene, a homologue of the human epilepsy gene LGI1. We show that LGI2, like LGI1, is neuronally secreted and acts on metalloproteinase-lacking members of the ADAM family of neuronal receptors, which function in synapse remodeling, and that LGI2 truncation, like LGI1 truncations, prevents secretion and ADAM interaction. The resulting epilepsy onsets at around seven weeks (equivalent to human two years), and remits by four months (human eight years), versus onset after age eight in the majority of human patients with LGI1 mutations. Finally, we show that Lgi2 is expressed highly in the immediate post-natal period until halfway through pruning, unlike Lgi1, which is expressed in the latter part of pruning and beyond. LGI2 acts at least in part through the same ADAM receptors as LGI1, but earlier, ensuring electrical stability (absence of epilepsy) during pruning years, preceding this same function performed by LGI1 in later years. LGI2 should be considered a candidate gene for common remitting childhood epilepsies, and LGI2-to-LGI1 transition for mechanisms of childhood epilepsy remission. Major remodeling of the neuronal synaptic network occurs during childhood. The quadrillion synapses formed till the end of age two are trimmed to 500 trillion by age 10 through a selective process of strengthening of ideal connections, removal of redundant ones, and formation of new contacts. Very little is known about the basic mechanisms that direct this massive reorganization that leads to the adult brain. The most common epilepsies of humans occur in childhood and are characterized by remission prior to adulthood. Not much is known about their genetics and basic remission mechanisms. We describe here a canine equivalent disease and identify the defective gene, Lgi2. We show that the gene product is a secreted protein and interacts with neuronal ADAM receptors known to be involved in the regulation of synaptic remodeling in the developing brain. Our work sheds important light on the basic mechanisms of the most common neurological disease of children and discloses processes of epilepsy remission. The identification of the first focal epilepsy gene in dogs has also enabled the development of a genetic test to identify carriers for breeding purposes.
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Affiliation(s)
- Eija H. Seppälä
- Department of Veterinary Biosciences, Department of Medical Genetics, Research Programs Unit, Molecular Medicine, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Research Center, Helsinki, Finland
| | - Tarja S. Jokinen
- Department of Clinical Veterinary Sciences, University of Helsinki, Helsinki, Finland
| | - Masaki Fukata
- Division of Membrane Physiology, Department of Cell Physiology, National Institute for Physiological Sciences and National Institutes of Natural Sciences, Okazaki, Japan
| | - Yuko Fukata
- Division of Membrane Physiology, Department of Cell Physiology, National Institute for Physiological Sciences and National Institutes of Natural Sciences, Okazaki, Japan
- PRESTO, Japan Science and Technology Agency, Tokyo, Japan
| | - Matthew T. Webster
- Science for Life Laboratory, Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Elinor K. Karlsson
- Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
- FAS Center for Systems Biology, Harvard University, Cambridge, Massachusetts, United States of America
| | - Sami K. Kilpinen
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
| | - Frank Steffen
- Department for Small Animals, Neurology Services, University of Zurich, Zurich, Switzerland
| | - Elisabeth Dietschi
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Department of Clinical Veterinary Medicine, Division of Small Animal Orthopedics and Surgery, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Ranja Eklund
- Department of Veterinary Biosciences, Department of Medical Genetics, Research Programs Unit, Molecular Medicine, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Research Center, Helsinki, Finland
| | - Xiaochu Zhao
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, Canada
| | - Jennifer J. Rilstone
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, Canada
| | - Kerstin Lindblad-Toh
- Science for Life Laboratory, Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Broad Institute of Harvard and MIT, Cambridge, Massachusetts, United States of America
| | - Berge A. Minassian
- Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, Canada
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, Toronto, Canada
| | - Hannes Lohi
- Department of Veterinary Biosciences, Department of Medical Genetics, Research Programs Unit, Molecular Medicine, University of Helsinki, Helsinki, Finland
- Department of Molecular Genetics, Folkhälsan Research Center, Helsinki, Finland
- * E-mail:
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Limviphuvadh V, Chua LL, Rahim RAAB, Eisenhaber F, Maurer-Stroh S, Adhikari S. Similarity of molecular phenotype between known epilepsy gene LGI1 and disease candidate gene LGI2. BMC BIOCHEMISTRY 2010; 11:39. [PMID: 20863412 PMCID: PMC2949613 DOI: 10.1186/1471-2091-11-39] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Accepted: 09/24/2010] [Indexed: 11/20/2022]
Abstract
Background The LGI2 (leucine-rich, glioma inactivated 2) gene, a prime candidate for partial epilepsy with pericentral spikes, belongs to a family encoding secreted, beta-propeller domain proteins with EPTP/EAR epilepsy-associated repeats. In another family member, LGI1 (leucine-rich, glioma inactivated 1) mutations are responsible for autosomal dominant lateral temporal epilepsy (ADLTE). Because a few LGI1 disease mutations described in the literature cause secretion failure, we experimentally analyzed the secretion efficiency and subcellular localization of several LGI1 and LGI2 mutant proteins corresponding to observed non-synonymous single nucleotide polymorphisms (nsSNPs) affecting the signal peptide, the leucine-rich repeats and the EAR propeller. Results Mapping of disease-causing mutations in the EAR domain region onto a 3D-structure model shows that many of these mutations co-localize at an evolutionary conserved surface region of the propeller. We find that wild-type LGI2 is secreted to the extracellular medium in glycosylated form similarly to LGI1, whereas several mutant proteins tested in this study are secretion-deficient and accumulate in the endoplasmic reticulum. Interestingly, mutations at structurally homologous positions in the EAR domain have the same effect on secretion in LGI1 and LGI2. Conclusions This similarity of experimental mislocalization phenotypes for mutations at homologous positions of LGI2 and the established epilepsy gene LGI1 suggests that both genes share a potentially common molecular pathogenesis mechanism that might be the reason for genotypically distinct but phenotypically related forms of epilepsy.
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Affiliation(s)
- Vachiranee Limviphuvadh
- Bioinformatics Institute, Agency for Science, Technology and Research, 30 Biopolis Street, #07-01 Matrix, 138671 Singapore.
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Park WJ, Lim YY, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-Rich Glioma Inactivated 3 Induces Neurite Outgrowth Through Akt and Focal Adhesion Kinase. Neurochem Res 2010; 35:789-96. [DOI: 10.1007/s11064-010-0136-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/04/2010] [Indexed: 01/14/2023]
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Regional distribution of the leucine-rich glioma inactivated (LGI) gene family transcripts in the adult mouse brain. Brain Res 2010; 1307:177-94. [DOI: 10.1016/j.brainres.2009.10.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 10/02/2009] [Accepted: 10/03/2009] [Indexed: 01/12/2023]
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Nobile C, Michelucci R, Andreazza S, Pasini E, Tosatto SCE, Striano P. LGI1 mutations in autosomal dominant and sporadic lateral temporal epilepsy. Hum Mutat 2009; 30:530-6. [PMID: 19191227 DOI: 10.1002/humu.20925] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Autosomal dominant lateral temporal epilepsy (ADLTE) or autosomal dominant partial epilepsy with auditory features (ADPEAF) is an inherited epileptic syndrome with onset in childhood/adolescence and benign evolution. The hallmark of the syndrome consists of typical auditory auras or ictal aphasia in most affected family members. ADTLE/ADPEAF is associated in about half of the families with mutations of the leucine-rich, glioma-inactivated 1 (LGI1) gene. In addition, de novo LGI1 mutations are found in about 2% of sporadic cases with idiopathic partial epilepsy with auditory features, who are clinically similar to the majority of patients with ADLTE/ADPEAF but have no family history. Twenty-five LGI1 mutations have been described in familial and sporadic lateral temporal epilepsy patients. The mutations are distributed throughout the gene and are mostly missense mutations occurring in both the N-terminal leucine rich repeat (LRR) and C-terminal EPTP (beta propeller) protein domains. We show a tridimensional model of the LRR protein region that allows missense mutations of this region to be divided into two distinct groups: structural and functional mutations. Frameshift, nonsense and splice site point mutations have also been reported that result in protein truncation or internal deletion. The various types of mutations are associated with a rather homogeneous phenotype, and no obvious genotype-phenotype correlation can be identified. Both truncating and missense mutations appear to prevent secretion of mutant proteins, suggesting a loss of function effect of mutations. The function of LGI1 is unclear. Several molecular mechanisms possibly leading to lateral temporal epilepsy are illustrated and briefly discussed.
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Affiliation(s)
- Carlo Nobile
- Istituto di Neuroscienze del CNR, Sezione di Padova, Dipartimento di Scienze Biomediche Sperimentali, Università di Padova, Padova, Italy.
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Abstract
Individuals with epilepsy are at increased risk of having psychotic symptoms that resemble those of schizophrenia. More controversial and less searched is if schizophrenia is a risk factor for epilepsy. Here we review overlapping epidemiological, clinical, neuropathological and neuroimaging features of these two diseases. We discuss the role of temporal and other brain areas in the development of schizophrenia-like psychosis of epilepsy. We underline the importance of ventricular enlargement in both conditions as a phenotypic manifestation of a shared biologic liability that might relate to abnormalities in neurodevelopment. We suggest that genes implicated in neurodevelopment may play a common role in both conditions and speculate that recently identified causative genes for partial complex seizures with auditory features might help explain the pathophysiology of schizophrenia. These particularly include the leucine-rich glioma inactivated (LGI) family gene loci overlap with genes of interest for psychiatric diseases like schizophrenia. Finally, we conclude that LGI genes associated with partial epilepsy with auditory features might also represent genes of interest for schizophrenia, especially among patients with prominent auditory hallucinations and formal thought disorder.
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Park WJ, Lee SE, Kwon NS, Baek KJ, Kim DS, Yun HY. Leucine-rich glioma inactivated 3 associates with syntaxin 1. Neurosci Lett 2008; 444:240-4. [PMID: 18760330 DOI: 10.1016/j.neulet.2008.08.044] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Revised: 08/06/2008] [Accepted: 08/08/2008] [Indexed: 10/21/2022]
Abstract
Leucine-rich glioma inactivated 3 (LGI3) is a member of LGI/epitempin (EPTP) family. The biological function of LGI3 and its association with disease are not known. We previously reported that mouse LGI3 was highly expressed in brain in a developmentally and transcriptionally regulated manner. In this study, we identified syntaxin 1, a SNARE component in exocytosis, as a candidate functional target of LGI3. Western blot analysis of mouse brain extract with LGI3 antibodies detected multiple protein forms (75-, 60-, 35- and 25-kDa). Proteomic analysis, pull-down and coimmunoprecipitation experiments identified syntaxin 1 as an LGI3-associated protein. LGI3 colocalized with syntaxin 1 in processes of cortical neurons with punctate synaptic pattern and was enriched in synaptosomal fraction. Coimmunoprecipitation showed that LGI3-syntaxin 1 complex did not contain other SNARE components, SNAP25 and VAMP2. Recombinant LGI3 attenuated Ca(2+)-evoked glutamate release from digitonin-permeabilized synaptosomes and transfection of PC12 cells with LGI3 decreased K(+)-induced secretion of human growth hormone. Thus, LGI3 may play a regulatory role in neuronal exocytosis via its interaction with syntaxin 1.
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Affiliation(s)
- Woo-Jae Park
- Department of Biochemistry, College of Medicine, Chung-Ang University, 221 Heuksuk-dong, Dongjak-koo, Seoul 156-756, Republic of Korea
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