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Cipriani V, Vestito L, Magavern EF, Jacobsen JO, Arno G, Behr ER, Benson KA, Bertoli M, Bockenhauer D, Bowl MR, Burley K, Chan LF, Chinnery P, Conlon P, Costa M, Davidson AE, Dawson SJ, Elhassan E, Flanagan SE, Futema M, Gale DP, García-Ruiz S, Corcia CG, Griffin HR, Hambleton S, Hicks AR, Houlden H, Houlston RS, Howles SA, Kleta R, Lekkerkerker I, Lin S, Liskova P, Mitchison H, Morsy H, Mumford AD, Newman WG, Neatu R, O'Toole EA, Ong AC, Pagnamenta AT, Rahman S, Rajan N, Robinson PN, Ryten M, Sadeghi-Alavijeh O, Sayer JA, Shovlin CL, Taylor JC, Teltsh O, Tomlinson I, Tucci A, Turnbull C, van Eerde AM, Ware JS, Watts LM, Webster AR, Westbury SK, Zheng SL, Caulfield M, Smedley D. Rare disease gene association discovery from burden analysis of the 100,000 Genomes Project data. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.12.20.23300294. [PMID: 38196618 PMCID: PMC10775325 DOI: 10.1101/2023.12.20.23300294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
To discover rare disease-gene associations, we developed a gene burden analytical framework and applied it to rare, protein-coding variants from whole genome sequencing of 35,008 cases with rare diseases and their family members recruited to the 100,000 Genomes Project (100KGP). Following in silico triaging of the results, 88 novel associations were identified including 38 with existing experimental evidence. We have published the confirmation of one of these associations, hereditary ataxia with UCHL1 , and independent confirmatory evidence has recently been published for four more. We highlight a further seven compelling associations: hypertrophic cardiomyopathy with DYSF and SLC4A3 where both genes show high/specific heart expression and existing associations to skeletal dystrophies or short QT syndrome respectively; monogenic diabetes with UNC13A with a known role in the regulation of β cells and a mouse model with impaired glucose tolerance; epilepsy with KCNQ1 where a mouse model shows seizures and the existing long QT syndrome association may be linked; early onset Parkinson's disease with RYR1 with existing links to tremor pathophysiology and a mouse model with neurological phenotypes; anterior segment ocular abnormalities associated with POMK showing expression in corneal cells and with a zebrafish model with developmental ocular abnormalities; and cystic kidney disease with COL4A3 showing high renal expression and prior evidence for a digenic or modifying role in renal disease. Confirmation of all 88 associations would lead to potential diagnoses in 456 molecularly undiagnosed cases within the 100KGP, as well as other rare disease patients worldwide, highlighting the clinical impact of a large-scale statistical approach to rare disease gene discovery.
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Yue SY, Niu D, Liu XH, Li WY, Ding K, Fang HY, Wu XD, Li C, Guan Y, Du HX. BLCA prognostic model creation and validation based on immune gene-metabolic gene combination. Discov Oncol 2023; 14:232. [PMID: 38103068 PMCID: PMC10725402 DOI: 10.1007/s12672-023-00853-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 12/14/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND Bladder cancer (BLCA) is a prevalent urinary system malignancy. Understanding the interplay of immunological and metabolic genes in BLCA is crucial for prognosis and treatment. METHODS Immune/metabolism genes were extracted, their expression profiles analyzed. NMF clustering found prognostic genes. Immunocyte infiltration and tumor microenvironment were examined. Risk prognostic signature using Cox/LASSO methods was developed. Immunological Microenvironment and functional enrichment analysis explored. Immunotherapy response and somatic mutations evaluated. RT-qPCR validated gene expression. RESULTS We investigated these genes in 614 BLCA samples, identifying relevant prognostic genes. We developed a predictive feature and signature comprising 7 genes (POLE2, AHNAK, SHMT2, NR2F1, TFRC, OAS1, CHKB). This immune and metabolism-related gene (IMRG) signature showed superior predictive performance across multiple datasets and was independent of clinical indicators. Immunotherapy response and immune cell infiltration correlated with the risk score. Functional enrichment analysis revealed distinct biological pathways between low- and high-risk groups. The signature demonstrated higher prediction accuracy than other signatures. qRT-PCR confirmed differential gene expression and immunotherapy response. CONCLUSIONS The model in our work is a novel assessment tool to measure immunotherapy's effectiveness and anticipate BLCA patients' prognosis, offering new avenues for immunological biomarkers and targeted treatments.
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Affiliation(s)
- Shao-Yu Yue
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Di Niu
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Xian-Hong Liu
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Wei-Yi Li
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Ke Ding
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Hong-Ye Fang
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Xin-Dong Wu
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Chun Li
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China.
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China.
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China.
| | - Yu Guan
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China.
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China.
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China.
| | - He-Xi Du
- Department of Urology, the First Affiliated Hospital of Anhui Medical University, Anhui Medical University, No. 218 Jixi Road, Hefei, 230022, Anhui, People's Republic of China.
- Institute of Urology, Anhui Medical University, Hefei, Anhui, People's Republic of China.
- Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, People's Republic of China.
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Zhang S, Cai Z, Li H. AHNAKs roles in physiology and malignant tumors. Front Oncol 2023; 13:1258951. [PMID: 38033502 PMCID: PMC10682155 DOI: 10.3389/fonc.2023.1258951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/30/2023] [Indexed: 12/02/2023] Open
Abstract
The AHNAK family currently consists of two members, namely AHNAK and AHNAK2, both of which have a molecular weight exceeding 600 kDa. Homologous sequences account for approximately 90% of their composition, indicating a certain degree of similarity in terms of molecular structure and biological functions. AHNAK family members are involved in the regulation of various biological functions, such as calcium channel modulation and membrane repair. Furthermore, with advancements in biological and bioinformatics technologies, research on the relationship between the AHNAK family and tumors has rapidly increased in recent years, and its regulatory role in tumor progression has gradually been discovered. This article briefly describes the physiological functions of the AHNAK family, and reviews and analyzes the expression and molecular regulatory mechanisms of the AHNAK family in malignant tumors using Pubmed and TCGA databases. In summary, AHNAK participates in various physiological and pathological processes in the human body. In multiple types of cancers, abnormal expression of AHNAK and AHNAK2 is associated with prognosis, and they play a key regulatory role in tumor progression by activating signaling pathways such as ERK, MAPK, Wnt, and MEK, as well as promoting epithelial-mesenchymal transition.
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Affiliation(s)
- Shusen Zhang
- Hebei Province Xingtai People’s Hospital Postdoctoral Workstation, Xingtai, China
- Postdoctoral Mobile Station, Hebei Medical University, Shijiazhuang, China
- Department of Pulmonary and Critical Care Medicine, Affiliated Xing Tai People Hospital of Hebei Medical University, Xingtai, China
- The First Department of Pulmonary and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Zhigang Cai
- Postdoctoral Mobile Station, Hebei Medical University, Shijiazhuang, China
- The First Department of Pulmonary and Critical Care Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Hui Li
- Department of surgery, Affiliated Xing Tai People Hospital of Hebei Medical University, Xingtai, China
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Liu H, Qiu B, Yang H, Zheng W, Luo Y, Zhong Y, Lu P, Chen J, Luo Y, Liu J, Yang B. AHNAK, regulated by the OSM/OSMR signaling, involved in the development of primary localized cutaneous amyloidosis. J Dermatol Sci 2023:S0923-1811(23)00111-1. [PMID: 37100691 DOI: 10.1016/j.jdermsci.2023.04.004] [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: 01/12/2023] [Revised: 04/09/2023] [Accepted: 04/13/2023] [Indexed: 04/28/2023]
Abstract
BACKGROUND Primary localized cutaneous amyloidosis (PLCA) is a chronic skin disease characterized by aberrant keratinocyte differentiation, epidermal hyperproliferation, and amyloid deposits. Previously, we demonstrated OSMR loss-function mutants enhanced basal keratinocyte differentiation through the OSMR/STAT5/KLF7 signaling in PLCA patients. OBJECTIVE To investigate the underlying mechanisms involved in basal keratinocyte proliferation in PLCA patients that remain unclear. METHODS Patients with pathologically confirmed PLCA visiting the dermatologic outpatient clinic were involved in the study. Laser capture microdissection and mass spectrometry analysis, gene-edited mice, 3D human epidermis culture, flow cytometry, western blot, qRT-PCR and RNA sequencing were used to explore the underlying molecular mechanisms. RESULTS In this study, we found that AHNAK peptide fragments were enriched in the lesions of PLCA patients, as detected by laser capture microdissection and mass spectrometry analysis. The upregulated expression of AHNAK was further confirmed using immunohistochemical staining. qRT-PCR and flow cytometry revealed that pre-treatment with OSM can inhibit AHNAK expression in HaCaT cells, NHEKs, and 3D human skin models, but OSMR knockout or OSMR mutations abolished this down-regulation trend. Similar results were obtained in wild-type and OSMR knockout mice. More importantly, EdU incorporation and FACS assays demonstrated the knockdown of AHNAK could induce G1 phase cell cycle arrest and inhibit keratinocyte proliferation. Furthermore, RNA sequencing revealed that AHNAK knockdown regulated keratinocyte differentiation. CONCLUSION Taken together, these data indicated that the elevated expression of AHNAK by OSMR mutations led to hyperproliferation and overdifferentiation of keratinocytes, and the discovered mechanism might provide insights into potential therapeutic targets for PLCA.
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Affiliation(s)
- Huiting Liu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Biying Qiu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Huan Yang
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Wen Zheng
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Yingying Luo
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Yadan Zhong
- Department of Dermatology, The First People's Hospital of Foshan, Foshan 528010, China
| | - Ping Lu
- Department of Science & Education, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Junyi Chen
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Ying Luo
- Department of Dermatology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Jun Liu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China; Joint Laboratory of Dermatology Hospital, Southern Medical University and China Resources Sanjiu Medical & Pharmaceutical Co., Ltd, Guangzhou 510091, China.
| | - Bin Yang
- Department of Dermatology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China; Joint Laboratory of Dermatology Hospital, Southern Medical University and China Resources Sanjiu Medical & Pharmaceutical Co., Ltd, Guangzhou 510091, China; Guangdong-Hong Kong Joint Laboratory of Dermatology Research, Guangzhou 510091, China.
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Zardab M, Stasinos K, Grose RP, Kocher HM. The Obscure Potential of AHNAK2. Cancers (Basel) 2022; 14:cancers14030528. [PMID: 35158796 PMCID: PMC8833689 DOI: 10.3390/cancers14030528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 12/17/2022] Open
Abstract
Simple Summary AHNAK2 is a relatively newly discovered protein. It can interact with many other proteins. This protein is increased in cells of variety of different cancers. AHNAK2 may play a vital role in cancer formation. AHNAK2 may have a role in early detection of cancer. This obscure potential of AHNAK2 is being studied. Abstract AHNAK2 is a protein discovered in 2004, with a strong association with oncogenesis in various epithelial cancers. It has a large 616 kDa tripartite structure and is thought to take part in the formation of large multi-protein complexes. High expression is found in clear cell renal carcinoma, pancreatic ductal adenocarcinoma, uveal melanoma, and lung adenocarcinoma, with a relation to poor prognosis. Little work has been done in exploring the function and relation AHNAK2 has with cancer, with early studies showing promising potential as a future biomarker and therapeutic target.
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Jin J, Bhatti DL, Lee KW, Medrihan L, Cheng J, Wei J, Zhong P, Yan Z, Kooiker C, Song C, Ahn JH, Obermair GJ, Lee A, Gresack J, Greengard P, Kim Y. Ahnak scaffolds p11/Anxa2 complex and L-type voltage-gated calcium channel and modulates depressive behavior. Mol Psychiatry 2020; 25:1035-1049. [PMID: 30760886 PMCID: PMC6692256 DOI: 10.1038/s41380-019-0371-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 12/14/2018] [Accepted: 01/11/2019] [Indexed: 01/05/2023]
Abstract
Genetic polymorphisms of the L-type voltage-gated calcium channel (VGCC) are associated with psychiatric disorders including major depressive disorder. Alterations of S100A10 (p11) level are also implicated in the etiology of major depressive disorder. However, the existence of an endogenous regulator in the brain regulating p11, L-type VGCC, and depressive behavior has not been known. Here we report that Ahnak, whose function in the brain has been obscure, stabilizes p11 and Anxa2 proteins in the hippocampus and prefrontal cortex in the rodent brain. Protein levels of Ahnak, p11, and Anxa2 are highly and positively correlated in the brain. Together these data suggest the existence of an Ahnak/p11/Anxa2 protein complex. Ahnak is expressed in p11-positive as well as p11-negative neurons. Ahnak, through its N-terminal region, scaffolds the L-type pore-forming α1 subunit and, through its C-terminal region, scaffolds the β subunit of VGCC and the p11/Anxa2 complex. Cell surface expression of the α1 subunits and L-type calcium current are significantly reduced in primary cultures of Ahnak knockout (KO) neurons compared to wild-type controls. A decrease in the L-type calcium influx is observed in both glutamatergic neurons and parvalbumin (PV) GABAergic interneurons of Ahnak KO mice. Constitutive Ahnak KO mice or forebrain glutamatergic neuron-selective Ahnak KO mice display a depression-like behavioral phenotype similar to that of constitutive p11 KO mice. In contrast, PV interneuron-selective Ahnak KO mice display an antidepressant-like behavioral phenotype. Our results demonstrate L-type VGCC as an effector of the Ahnak/p11/Anxa2 complex, revealing a novel molecular connection involved in the control of depressive behavior.
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Affiliation(s)
- Junghee Jin
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Dionnet L. Bhatti
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Ko-Woon Lee
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Lucian Medrihan
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Jia Cheng
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Jing Wei
- 0000 0004 1936 9887grid.273335.3Department of Physiology and Biophysics, School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY USA
| | - Ping Zhong
- 0000 0004 1936 9887grid.273335.3Department of Physiology and Biophysics, School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY USA
| | - Zhen Yan
- 0000 0004 1936 9887grid.273335.3Department of Physiology and Biophysics, School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY USA
| | - Cassandra Kooiker
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Claire Song
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Jung-Hyuck Ahn
- 0000 0001 2171 7754grid.255649.9Department of Biochemistry, Ewha Womans University, Seoul, South Korea
| | - Gerald J. Obermair
- 0000 0000 8853 2677grid.5361.1Division of Physiology, Medical University Innsbruck, 6020 Innsbruck, Austria
| | - Amy Lee
- 0000 0004 1936 8294grid.214572.7Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA USA
| | - Jodi Gresack
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Paul Greengard
- 0000 0001 2166 1519grid.134907.8Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY 10065 USA
| | - Yong Kim
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.
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Bhattacharya S, Duverger O, Brooks SR, Morasso MI. Homeobox transcription factor DLX4 is not necessary for skin development and homeostasis. Exp Dermatol 2019; 27:289-292. [PMID: 29380438 DOI: 10.1111/exd.13503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/16/2018] [Indexed: 12/18/2022]
Abstract
Dlx4 is a member of a family of homeobox genes with homology to Drosophila distal-less (dll) gene. We show that Dlx4 expression pattern partially overlaps with its cis-linked gene Dlx3 during mouse development as well as in neonatal and adult skin. In mice, Dlx4 is expressed in the branchial arches, embryonic limbs, digits, nose, hair follicle and in the basal and suprabasal layers of mouse interfollicular epidermis. We show that inactivation of Dlx4 in mice did not result in any overtly gross pathology. Skin development, homeostasis and response to TPA treatment were similar in mice with loss of Dlx4 compared to wild-type counterparts.
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Affiliation(s)
- Shreya Bhattacharya
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Olivier Duverger
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Stephen R Brooks
- Biodata Mining and Discovery Section, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
| | - Maria I Morasso
- Laboratory of Skin Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD, USA
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Silva TA, Smuczek B, Valadão IC, Dzik LM, Iglesia RP, Cruz MC, Zelanis A, de Siqueira AS, Serrano SMT, Goldberg GS, Jaeger RG, Freitas VM. AHNAK enables mammary carcinoma cells to produce extracellular vesicles that increase neighboring fibroblast cell motility. Oncotarget 2018; 7:49998-50016. [PMID: 27374178 PMCID: PMC5226564 DOI: 10.18632/oncotarget.10307] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 06/12/2016] [Indexed: 12/31/2022] Open
Abstract
Extracellular vesicles play important roles in tumor development. Many components of these structures, including microvesicles and exosomes, have been defined. However, mechanisms by which extracellular vesicles affect tumor progression are not fully understood. Here, we investigated vesicular communication between mammary carcinoma cells and neighboring nontransformed mammary fibroblasts. Nonbiased proteomic analysis found that over 1% of the entire proteome is represented in these vesicles, with the neuroblast differentiation associated protein AHNAK and annexin A2 being the most abundant. In particular, AHNAK was found to be the most prominent component of these vesicles based on peptide number, and appeared necessary for their formation. In addition, we report here that carcinoma cells produce vesicles that promote the migration of recipient fibroblasts. These data suggest that AHNAK enables mammary carcinoma cells to produce and release extracellular vesicles that cause disruption of the stroma by surrounding fibroblasts. This paradigm reveals fundamental mechanisms by which vesicular communication between carcinoma cells and stromal cells can promote cancer progression in the tumor microenvironment.
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Affiliation(s)
- Thaiomara A Silva
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Basílio Smuczek
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Iuri C Valadão
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Luciana M Dzik
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Rebeca P Iglesia
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Mário C Cruz
- Center of Facilities and Support Research, Institute of Biomedical Sciences (ICB), Sao Paulo, Brazil
| | - André Zelanis
- Department of Science and Technology, Institute of Science and Technology, Federal University of Sao Paulo (ICT-UNIFESP), Sao Jose dos Campos, Brazil.,Special Laboratory of Applied Toxinology, Center of Toxins, Immune-Response and Cell Signaling, Butantan Institute, Sao Paulo, Brazil
| | - Adriane S de Siqueira
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Solange M T Serrano
- Special Laboratory of Applied Toxinology, Center of Toxins, Immune-Response and Cell Signaling, Butantan Institute, Sao Paulo, Brazil
| | - Gary S Goldberg
- Department of Molecular Biology, School of Osteopathic Medicine, Rowan University, Stratford, New Jersey, USA
| | - Ruy G Jaeger
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
| | - Vanessa M Freitas
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences (ICB), University of Sao Paulo, Sao Paulo, Brazil
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Haase N, Rüder C, Haase H, Kamann S, Kouno M, Morano I, Dechend R, Zohlnhöfer D, Haase T. Protective Function of Ahnak1 in Vascular Healing after Wire Injury. J Vasc Res 2017; 54:131-142. [PMID: 28468000 DOI: 10.1159/000464287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 02/13/2017] [Indexed: 01/17/2023] Open
Abstract
AIM Vascular remodeling following injury substantially accounts for restenosis and adverse clinical outcomes. In this study, we investigated the role of the giant scaffold protein Ahnak1 in vascular healing after endothelial denudation of the murine femoral artery. METHODS The spatiotemporal expression pattern of Ahnak1 and Ahnak2 was examined using specific antibodies and real-time quantitative PCR. Following wire-mediated endothelial injury of Ahnak1-deficient mice and wild-type (WT) littermates, the processes of vascular healing were analyzed. RESULTS Ahnak1 and Ahnak2 showed a mutually exclusive vascular expression pattern, with Ahnak1 being expressed in the endothelium and Ahnak2 in the medial cells in naïve WT arteries. After injury, a marked increase of Ahnak1- and Ahnak2-positive cells at the lesion site became evident. Both proteins showed a strong upregulation in neointimal cells 14 days after injury. Ahnak1-deficient mice showed delayed vascular healing and dramatically impaired re-endothelialization that resulted in prolonged adverse vascular remodeling, when compared to the WT littermates. CONCLUSION The large scaffold and adaptor proteins Ahnak1 and Ahnak2 exhibit differential expression patterns and functions in naïve and injured arteries. Ahnak1 plays a nonredundant protective role in vascular healing.
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Affiliation(s)
- Nadine Haase
- Experimental and Clinical Research Center (a joint cooperation of the MDC and the Charité Medical Faculty), Berlin, Germany
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Kirov A, Kacer D, Conley BA, Vary CPH, Prudovsky I. AHNAK2 Participates in the Stress-Induced Nonclassical FGF1 Secretion Pathway. J Cell Biochem 2016; 116:1522-31. [PMID: 25560297 DOI: 10.1002/jcb.25047] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 12/16/2014] [Indexed: 12/22/2022]
Abstract
FGF1 is a nonclassically released growth factor that regulates carcinogenesis, angiogenesis, and inflammation. In vitro and in vivo, FGF1 export is stimulated by cell stress. Upon stress, FGF1 is transported to the plasma membrane where it localizes prior to transmembrane translocation. To determine which proteins participate in the submembrane localization of FGF1 and its export, we used immunoprecipitation mass spectrometry to identify novel proteins that associate with FGF1 during heat shock. The heat shock-dependent association of FGF1 with the large protein AHNAK2 was observed. Heat shock induced the translocation of FGF1 and AHNAK2 to the cytoskeletal fraction. In heat-shocked cells, FGF1 and the C-terminal fragment of AHNAK2 colocalized with F-actin in the vicinity of the cell membrane. Depletion of AHNAK2 resulted in a drastic decrease of stress-induced FGF1 export but did not affect spontaneous FGF2 export and FGF1 release induced by the inhibition of Notch signaling. Thus, AHNAK2 is an important element of the FGF1 nonclassical export pathway.
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Affiliation(s)
- Aleksandr Kirov
- Center for Molecular Medicine, Maine Medical Center Research Institute, Maine Medical Center, Scarborough, 04074, Maine
| | - Doreen Kacer
- Center for Molecular Medicine, Maine Medical Center Research Institute, Maine Medical Center, Scarborough, 04074, Maine
| | - Barbara A Conley
- Center for Molecular Medicine, Maine Medical Center Research Institute, Maine Medical Center, Scarborough, 04074, Maine
| | - Calvin P H Vary
- Center for Molecular Medicine, Maine Medical Center Research Institute, Maine Medical Center, Scarborough, 04074, Maine
| | - Igor Prudovsky
- Center for Molecular Medicine, Maine Medical Center Research Institute, Maine Medical Center, Scarborough, 04074, Maine
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11
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Shin JH, Kim YN, Kim IY, Choi DH, Yi SS, Seong JK. Increased Cell Proliferations and Neurogenesis in the Hippocampal Dentate Gyrus of Ahnak Deficient Mice. Neurochem Res 2015; 40:1457-62. [DOI: 10.1007/s11064-015-1615-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/06/2015] [Accepted: 05/12/2015] [Indexed: 10/23/2022]
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12
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Davis TA, Loos B, Engelbrecht AM. AHNAK: the giant jack of all trades. Cell Signal 2014; 26:2683-93. [PMID: 25172424 DOI: 10.1016/j.cellsig.2014.08.017] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/08/2014] [Accepted: 08/18/2014] [Indexed: 12/19/2022]
Abstract
The nucleoprotein AHNAK is an unusual and somewhat mysterious scaffolding protein characterised by its large size of approximately 700 kDa. Several aspects of this protein remain uncertain, including its exact molecular function and regulation on both the gene and protein levels. Various studies have attempted to annotate AHNAK and, notably, protein interaction and expression analyses have contributed greatly to our current understanding of the protein. The implicated biological processes are, however, very diverse, ranging from a role in the formation of the blood-brain barrier, cell architecture and migration, to the regulation of cardiac calcium channels and muscle membrane repair. In addition, recent evidence suggests that AHNAK might be yet another accomplice in the development of tumour metastasis. This review will discuss the different functional roles of AHNAK, highlighting recent advancements that have added foundation to the proposed roles while identifying ties between them. Implications for related fields of research are noted and suggestions for future research that will assist in unravelling the function of AHNAK are offered.
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Affiliation(s)
- T A Davis
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa.
| | - B Loos
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa
| | - A-M Engelbrecht
- Department of Physiological Sciences, University of Stellenbosch, Mike de Vries Building, c/o Merriman Avenue and Bosman Street, Stellenbosch 7600, South Africa
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13
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von Boxberg Y, Soares S, Féréol S, Fodil R, Bartolami S, Taxi J, Tricaud N, Nothias F. Giant scaffolding protein AHNAK1 interacts with β-dystroglycan and controls motility and mechanical properties of Schwann cells. Glia 2014; 62:1392-406. [PMID: 24796807 DOI: 10.1002/glia.22685] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 04/11/2014] [Accepted: 04/17/2014] [Indexed: 01/02/2023]
Abstract
The profound morphofunctional changes that Schwann cells (SCs) undergo during their migration and elongation on axons, as well as during axon sorting, ensheathment, and myelination, require their close interaction with the surrounding laminin-rich basal lamina. In contrast to myelinating central nervous system glia, SCs strongly and constitutively express the giant scaffolding protein AHNAK1, localized essentially underneath the outer, abaxonal plasma membrane. Using electron microscopy, we show here that in the sciatic nerve of ahnak1(-) (/) (-) mice the ultrastructure of myelinated, and unmyelinated (Remak) fibers is affected. The major SC laminin receptor β-dystroglycan co-immunoprecipitates with AHNAK1 shows reduced expression in ahnak1(-) (/) (-) SCs, and is no longer detectable in Cajal bands on myelinated fibers in ahnak1(-) (/) (-) sciatic nerve. Reduced migration velocity in a scratch wound assay of purified ahnak1(-) (/) (-) primary SCs cultured on a laminin substrate indicated a function of AHNAK1 in SC motility. This was corroborated by atomic force microscopy measurements, which revealed a greater mechanical rigidity of shaft and leading tip of ahnak1(-) (/) (-) SC processes. Internodal lengths of large fibers are decreased in ahnak1(-) (/) (-) sciatic nerve, and longitudinal extension of myelin segments is even more strongly reduced after acute knockdown of AHNAK1 in SCs of developing sciatic nerve. Together, our results suggest that by interfering in the cross-talk between the transmembrane form of the laminin receptor dystroglycan and F-actin, AHNAK1 influences the cytoskeleton organization of SCs, and thus plays a role in the regulation of their morphology and motility and lastly, the myelination process.
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Affiliation(s)
- Ysander von Boxberg
- Sorbonne Universités, UPMC CR18 (NPS), Paris, France; Neuroscience Paris Seine (NPS), CNRS UMR 8246, Paris, France; Neuroscience Paris Seine (NPS), INSERM U1130, Paris, France
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14
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Báez A, Martín-Antonio B, Piruat JI, Barbado MV, Prats C, Álvarez-Laderas I, Carmona M, Pérez-Simón JA, Urbano-Ispizua Á. Gene and miRNA expression profiles of hematopoietic progenitor cells vary depending on their origin. Biol Blood Marrow Transplant 2014; 20:630-9. [PMID: 24462744 DOI: 10.1016/j.bbmt.2014.01.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Accepted: 01/21/2014] [Indexed: 01/28/2023]
Abstract
Hematopoietic progenitor cells (HPCs) from granulocyte colony-stimulating factor (G-CSF)-mobilized peripheral blood (G-PB), bone marrow (BM), or umbilical cord blood (CB) have differing biological properties and differing kinetics of engraftment post-transplantation, which might be explained, at least in part, by differing gene and miRNA expression patterns. To assess the differences in gene and miRNA expression, we analyzed whole genome expression profiles as well as the expression of 384 miRNAs in CD34(+) cells isolated from 18 healthy individuals (6 individuals per subtype of HPC source). We identified 43 genes and 36 miRNAs differentially expressed in the various CD34(+) cell sources. We observed that CD34(+) cells from CB and BM showed similar gene and miRNA expression profiles, whereas CD34(+) cells from G-PB had a very different expression pattern. Remarkably, 20 of the differentially expressed genes are targets of the differentially expressed miRNAs. Of note, the majority of genes differentially expressed in CD34(+) cells from G-PB are involved in cell cycle regulation, promoting the process of proliferation, survival, hematopoiesis, and cell signaling, and are targets of overexpressed and underexpressed miRNAs in CD34(+) cells from the same source. These data suggest significant differences in gene and miRNA expression among the various HPC sources used in transplantation. We hypothesize that the differentially expressed genes and miRNAs involved in cell cycle and proliferation might explain the differing kinetics of engraftment observed after transplantation of hematopoietic stem cells obtained from these different sources.
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Affiliation(s)
- Alicia Báez
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville.
| | - Beatriz Martín-Antonio
- Department of Hematology/Hospital Clinic/IDIBAPS and Institute of Research Josep Carreras/University of Barcelona
| | - José I Piruat
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - Maria Victoria Barbado
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - Concepción Prats
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - Isabel Álvarez-Laderas
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - Magdalena Carmona
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - José Antonio Pérez-Simón
- Department of Hematology, University Hospital Virgen del Rocio/Institute of Biomedicine of Seville (IBIS)/CSIC/University of Seville
| | - Álvaro Urbano-Ispizua
- Department of Hematology/Hospital Clinic/IDIBAPS and Institute of Research Josep Carreras/University of Barcelona
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15
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Hashimoto T, Ishii N, Ohata C, Furumura M. Pathogenesis of epidermolysis bullosa acquisita, an autoimmune subepidermal bullous disease. J Pathol 2012; 228:1-7. [PMID: 22692770 DOI: 10.1002/path.4062] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Revised: 05/08/2012] [Accepted: 05/28/2012] [Indexed: 12/23/2022]
Abstract
Autoimmune bullous diseases (ABDs) are organ-specific autoimmune diseases, in which blisters on the skin and mucous membranes develop through binding of pathogenic autoantibodies to target antigens. There are two major ABD groups: the pemphigus group, showing autoantibodies to desmosomal components; and the subepidermal ABD group, showing autoantibodies to hemidesmosomal components in the epidermal basement membrane zone. Recent immunological, biochemical and molecular biological studies revealed many new autoantigens, including desmocollins, various plakin family proteins and integrins. A revised ABD classification includes new disease entities such as paraneoplastic pemphigus, IgA pemphigus and anti-laminin γ1 pemphigoid. In addition to systemic corticosteroids and various immunosuppressive agents, various adjuvant therapies for ABDs have developed. Among them, intravenous immunoglobulin (IVIG) is a promising therapy, although the therapeutic mechanisms are still unknown. Various disease models for ABDs have developed, particularly for pemphigus vulgaris, bullous pemphigoid and epidermolysis bullosa acquisita (EBA), and these have provided insights into the pathogenesis of various ADBs that suggest possible new treatment strategies. However, the fundamental mechanisms in disruption of immune-tolerance are still unknown. EBA shows autoimmunity to type VII collagen, the major component of anchoring fibrils, and EBA pathogenesis has been studied in various disease models. Previous studies suggested that, following binding of autoantibodies to type VII collagen, activation of complement, cytokine release, neutrophil migration, Fcγ receptors (FcgRs) and metalloproteinases play important roles in induction of subepidermal blisters. In this issue of the Journal of Pathology, Kasperkiewicz and colleagues reveal important roles of activating FcgRIV and inhibitory FcgRIIB in EBA pathogenesis that were recognized by conducting elegant studies using both genetic analysis and functional animal model methods. The expression equilibrium of the activating and inhibitory FcgRs can be modulated towards the inhibitory FcgRIIB by IVIG therapy, resulting in beneficial clinical effects of IVIG in EBA and other autoimmune skin-blistering diseases.
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Affiliation(s)
- Takashi Hashimoto
- Department of Dermatology, Kurume University School of Medicine, Fukuoka, Japan.
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16
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Pankonien I, Alvarez JL, Doller A, Köhncke C, Rotte D, Regitz-Zagrosek V, Morano I, Haase H. Ahnak1 is a tuneable modulator of cardiac Ca(v)1.2 calcium channel activity. J Muscle Res Cell Motil 2011; 32:281-90. [PMID: 22038483 DOI: 10.1007/s10974-011-9269-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Accepted: 10/13/2011] [Indexed: 11/29/2022]
Abstract
Ahnak1 has been implicated in the beta-adrenergic regulation of the cardiac L-type Ca(2+) channel current (I (CaL)) by its binding to the regulatory Cavβ(2) subunit. In this study, we addressed the question whether ahnak1/Cavβ(2) interactions are essential or redundant for beta-adrenergic stimulation of I (CaL). Three naturally occurring ahnak1 variants (V5075 M, G5242R, and T5796 M) identified by genetic screening of cardiomyopathy patients did essentially not influence the in vitro Cavβ(2) interaction as assessed by recombinant proteins. But, we observed a robust increase in Cavβ(2) binding by mutating Ala at position 4984 to Pro which creates a PxxP consensus motif in the ahnak1 protein fragment. Surface plasmon resonance measurements revealed that this mutation introduced an additional Cavβ(2) binding site. The functionality of A4984P was supported by the specific action of the Pro-containing ahnak1-derived peptide (P4984) in beta-adrenergic regulation of I (CaL). Patch clamp recordings on cardiomyocytes showed that intracellular perfusion of P4984 markedly reduced I (CaL) response to the beta-adrenergic agonist, isoprenaline, while the Ala-containing counterpart failed to affect I (CaL). Interestingly, I (CaL) of ahnak1-deficient cardiomyocytes was not affected by peptide application. Moreover, I (CaL) of ahnak1-deficient cardiomyocytes showed intact beta-adrenergic responsiveness. Similarly isolated ahnak1-deficient mouse hearts responded normally to adrenergic challenge. Our results indicate that ahnak1 is not essential for beta-adrenergic up-regulation of I (CaL) and cardiac contractility in mice. But, tuning ahnak1/Cavβ(2) interaction provides a tool for modulating the beta-adrenergic response of I (CaL).
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Affiliation(s)
- Ines Pankonien
- Max Delbrück Center for Molecular Medicine, Robert-Rössle-Str.10, 13125, Berlin, Germany
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17
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Rezvanpour A, Santamaria-Kisiel L, Shaw GS. The S100A10-annexin A2 complex provides a novel asymmetric platform for membrane repair. J Biol Chem 2011; 286:40174-83. [PMID: 21949189 PMCID: PMC3220529 DOI: 10.1074/jbc.m111.244038] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Membrane repair is mediated by multiprotein complexes, such as that formed between the dimeric EF-hand protein S100A10, the calcium- and phospholipid-binding protein annexin A2, the enlargeosome protein AHNAK, and members of the transmembrane ferlin family. Although interactions between these proteins have been shown, little is known about their structural arrangement and mechanisms of formation. In this work, we used a non-covalent complex between S100A10 and the N terminus of annexin A2 (residues 1-15) and a designed hybrid protein (A10A2), where S100A10 is linked in tandem to the N-terminal region of annexin A2, to explore the binding region, stoichiometry, and affinity with a synthetic peptide from the C terminus of AHNAK. Using multiple biophysical methods, we identified a novel asymmetric arrangement between a single AHNAK peptide and the A10A2 dimer. The AHNAK peptide was shown to require the annexin A2 N terminus, indicating that the AHNAK binding site comprises regions on both S100A10 and annexin proteins. NMR spectroscopy was used to show that the AHNAK binding surface comprised residues from helix IV in S100A10 and the C-terminal portion from the annexin A2 peptide. This novel surface maps to the exposed side of helices IV and IV' of the S100 dimeric structure, a region not identified in any previous S100 target protein structures. The results provide the first structural details of the ternary S100A10 protein complex required for membrane repair.
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Affiliation(s)
- Atoosa Rezvanpour
- Department of Biochemistry, University of Western Ontario, London, Ontario N6A 5C1, Canada
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18
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Sandjeu Y, Callejon S, Vincent C, Haftek M. Human epidermal desmosome-enriched tissue fractions for analytical and prospective studies. Exp Dermatol 2011; 20:357-60. [PMID: 21375588 DOI: 10.1111/j.1600-0625.2011.01252.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Here, we report a method, adapted to the human epidermis, allowing isolation of desmosomes in small tissue fractions. The methods previously developed for animal skin did not work efficiently with human tissue. Enrichment of desmosomes was performed by the association of two incubation steps in acidic solutions containing detergent NP-40 at two different concentrations followed by a sonication step. The suspension was centrifuged twice: first to remove the heavy cell fragments and then at 16000 g on a discontinuous sucrose gradient. A desmosome-enriched fraction (DsF) was collected at the 30-50% sucrose interface. We demonstrate by immunoelectron microscopy and by western blotting that the central part of the desmosome structure is preserved as well as the antigenicity of its components. Our approach, allowing a significant enrichment of the cell fractions containing desmosomes, can be used to immunize animals and create new antibodies directed against desmosomal components. Using this strategy, new and so far poorly studied molecules incorporated into the desmosome cores could be targeted more easily.
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Affiliation(s)
- Yongoua Sandjeu
- EA4169/Normal and pathological functions of skin barrier, Edouard Herriot Hospital, University Lyon 1, Lyon, France.
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19
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1H NMR-based metabolomic study on resistance to diet-induced obesity in AHNAK knock-out mice. Biochem Biophys Res Commun 2010; 403:428-34. [DOI: 10.1016/j.bbrc.2010.11.048] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Accepted: 11/14/2010] [Indexed: 11/18/2022]
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20
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Marg A, Haase H, Neumann T, Kouno M, Morano I. AHNAK1 and AHNAK2 are costameric proteins: AHNAK1 affects transverse skeletal muscle fiber stiffness. Biochem Biophys Res Commun 2010; 401:143-8. [PMID: 20833135 DOI: 10.1016/j.bbrc.2010.09.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 09/04/2010] [Indexed: 11/30/2022]
Abstract
The AHNAK scaffold PDZ-protein family is implicated in various cellular processes including membrane repair; however, AHNAK function and subcellular localization in skeletal muscle are unclear. We used specific AHNAK1 and AHNAK2 antibodies to analyzed the detailed localization of both proteins in mouse skeletal muscle. Co-localization of AHNAK1 and AHNAK2 with vinculin clearly demonstrates that both proteins are components of the costameric network. In contrast, no AHNAK expression was detected in the T-tubule system. A laser wounding assay with AHNAK1-deficient fibers suggests that AHNAK1 is not involved in membrane repair. Using atomic force microscopy (AFM), we observed a significantly higher transverse stiffness of AHNAK1⁻/⁻ fibers. These findings suggest novel functions of AHNAK proteins in skeletal muscle.
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Affiliation(s)
- Andreas Marg
- Max-Delbrück-Centrum für Molekulare Medizin, D-13092 Berlin, Germany.
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21
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Alvarez JL, Petzhold D, Pankonien I, Behlke J, Kouno M, Vassort G, Morano I, Haase H. Ahnak1 modulates L-type Ca2+ channel inactivation of rodent cardiomyocytes. Pflugers Arch 2010; 460:719-30. [DOI: 10.1007/s00424-010-0853-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 05/28/2010] [Accepted: 06/02/2010] [Indexed: 01/21/2023]
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22
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Okusa H, Kodera Y, Oh-Ishi M, Minamida Y, Tsuchida M, Kavoussi N, Matsumoto K, Sato T, Iwamura M, Maeda T, Baba S. Searching for new biomarkers of bladder cancer based on proteomic analysis. ACTA ACUST UNITED AC 2008. [DOI: 10.2198/jelectroph.52.19] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Holthöfer B, Windoffer R, Troyanovsky S, Leube RE. Structure and function of desmosomes. ACTA ACUST UNITED AC 2007; 264:65-163. [PMID: 17964922 DOI: 10.1016/s0074-7696(07)64003-0] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Desmosomes are prominent adhesion sites that are tightly associated with the cytoplasmic intermediate filament cytoskeleton providing mechanical stability in epithelia and also in several nonepithelial tissues such as cardiac muscle and meninges. They are unique in terms of ultrastructural appearance and molecular composition with cell type-specific variations. The dynamic assembly properties of desmosomes are important prerequisites for the acquisition and maintenance of tissue homeostasis. Disturbance of this equilibrium therefore not only compromises mechanical resilience but also affects many other tissue functions as becomes evident in various experimental scenarios and multiple diseases.
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Affiliation(s)
- Bastian Holthöfer
- Department of Anatomy and Cell Biology, Johannes Gutenberg University, 55128 Mainz, Germany
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24
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von Boxberg Y, Salim C, Soares S, Baloui H, Alterio J, Ravaille-Veron M, Nothias F. Spinal cord injury-induced up-regulation of AHNAK, expressed in cells delineating cystic cavities, and associated with neoangiogenesis. Eur J Neurosci 2006; 24:1031-41. [PMID: 16930430 DOI: 10.1111/j.1460-9568.2006.04994.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
To investigate the molecular basis for the poor regenerative capacity of the mammalian central nervous system (CNS) after injury, we searched for genes whose expression was affected by an adult rat spinal cord hemi-section. Differential screening of a rat spinal cord expression library was performed using polyclonal antibodies raised against lesioned spinal cord tissue. A striking overexpression was found for ahnak, encoding a 700-kDa protein, in normal CNS present only in the blood-brain barrier (BBB) forming vascular endothelial cells. Indeed, very early after spinal cord injury (SCI), high levels of membrane-associated AHNAK are observed on non-neuronal cells invading the lesion site. With time, AHNAK distribution spreads rostrally and caudally concomitant with the process of tissue inflammation and axon degeneration, delineating the interior surface of cystic cavities, mainly in front of barrier-forming astrocytes. Strong overexpression is also observed on vascular endothelial cells reacting to BBB breakdown. Based on our detailed analysis of its spatiotemporal and cellular expression, and its previously described function in BBB, we suggest that AHNAK expression is associated with cell types displaying tissue-protective barrier properties. Our study may thus contribute to the elucidation of the precise molecular and cellular events that eventually render traumatic spinal cord tissue non-permissive for regeneration.
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Affiliation(s)
- Ysander von Boxberg
- Neurobiology of Intercellular Signaling, CNRS UMR 7101, université Paris VI Pierre et Marie Curie, 7 quai Saint Bernard, 75005 Paris, France.
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25
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Nonnenmacher M, Salmon J, Jacob Y, Orth G, Breitburd F. Cottontail rabbit papillomavirus E8 protein is essential for wart formation and provides new insights into viral pathogenesis. J Virol 2006; 80:4890-900. [PMID: 16641280 PMCID: PMC1472083 DOI: 10.1128/jvi.80.10.4890-4900.2006] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The cottontail rabbit papillomavirus (CRPV) a and b subtypes display a conserved E8 open reading frame encoding a 50-amino-acid hydrophobic protein, with structural similarities to the E5 transmembrane oncoprotein of genital human PVs (HPVs). CRPV E8 has been reported to play a role in papilloma growth but not to be essential in papilloma formation. Here we report that the knockout of E8 start codon almost prevented wart induction upon biobalistic inoculation of viral DNA onto rabbit skin. The scarce warts induced showed very slow growth, despite sustained expression of E6 and E7 oncogenes. This points to an essential role of E8 in disturbing epidermal homeostasis. Using a yeast two-hybrid screen, we found that E8 interacted with the zinc transporter ZnT1, protocadherin 1 (PCDH1), and AHNAK/desmoyokin, three proteins as yet unrelated to viral pathogenesis or cell transformation. HPV16 E5 also interacted with these proteins in two-hybrid assay. CRPV E8 mainly localized to the Golgi apparatus and the early endosomes of transfected keratinocytes and colocalized with ZnT1, PCDH1, and AHNAK. We showed that ZnT1 and PCDH1 formed a complex and that E8 disrupted this complex. CRPV E8, like HPV16 E5, increased epidermal growth factor (EGF)-dependent extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation and both the EGF-dependent and the EGF-independent activity of activating protein-1 (AP-1). Competition experiments with a nonfunctional truncated ZnT1 protein showed that E8-ZnT1 interaction was required for AP-1 activation. Our data identify CRPV E8 as a key player in papilloma induction and unravel novel cellular targets for inducing the proliferation of keratinocytes.
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Affiliation(s)
- Masayuki Amagai
- Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
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