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Xu C, Zhu M, Zhao S, Zhang X, Wang Y, Liu M. Mutation of S461, in the GOLGA3 phosphorylation site, does not affect mouse spermatogenesis. PeerJ 2023; 11:e15133. [PMID: 37090114 PMCID: PMC10117384 DOI: 10.7717/peerj.15133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 03/06/2023] [Indexed: 04/25/2023] Open
Abstract
Background Golgin subfamily A member 3 (Golga3), a member of the golgin subfamily A, is highly expressed in mouse testis. The GOLGA3 protein, which contains eight phosphorylation sites, is involved in protein transport, cell apoptosis, Golgi localization, and spermatogenesis. Although it has been previously reported that nonsense mutations in Golga3 cause multiple defects in spermatogenesis, the role of Golga3 in the testis is yet to be clarified. Methods Immunofluorescence co-localization in cells and protein dephosphorylation experiments were performed. Golga3 S461L/S461Lmice were generated using cytosine base editors. Fertility tests as well as computer-assisted sperm analysis (CASA) were then performed to investigate sperm motility within caudal epididymis. Histological and immunofluorescence staining were used to analyze testis and epididymis phenotypes and TUNEL assays were used to measure germ cell apoptosis in spermatogenic tubules. Results Immunofluorescence co-localization showed reduced Golgi localization of GOLGA3S465L with some protein scattered in the cytoplasm of HeLa cells .In addition, protein dephosphorylation experiments indicated a reduced band shift of the dephosphorylated GOLGA3S465L, confirming S461 as the phosphorylation site. Golga3 is an evolutionarily conserved gene and Golga3 S461L/S461Lmice were successfully generated using cytosine base editors. These mice had normal fertility and spermatozoa, and did not differ significantly from wild-type mice in terms of spermatogenesis and apoptotic cells in tubules. Conclusions Golga3 was found to be highly conserved in the testis, and GOLGA3 was shown to be involved in spermatogenesis, especially in apoptosis and Golgi complex-mediated effects. Infertility was also observed in Golga3 KO male mice. Although GOLGA3S465Lshowed reduced localization in the Golgi with some expression in the cytoplasm, this abnormal localization did not adversely affect fertility or spermatogenesis in male C57BL/6 mice. Therefore, mutation of the S461 GOLGA3 phosphorylation site did not affect mouse spermatogenesis.
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Affiliation(s)
- Changtong Xu
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Mingcong Zhu
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Shuqin Zhao
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Xin Zhang
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Ying Wang
- State Key Laboratory of Reproductive Medicine, Department of Reproduction, Women’s Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
| | - Mingxi Liu
- State Key Laboratory of Reproductive Medicine, The Affiliated Taizhou People’s Hospital of Nanjing Medical University, Taizhou School of Clinical Medicine, Nanjing Medical University, Nanjing, China
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2
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Asada-Utsugi M, Uemura K, Ayaki T, T Uemura M, Minamiyama S, Hikiami R, Morimura T, Shodai A, Ueki T, Takahashi R, Kinoshita A, Urushitani M. Failure of DNA double-strand break repair by tau mediates Alzheimer's disease pathology in vitro. Commun Biol 2022; 5:358. [PMID: 35418705 DOI: 10.1038/s42003-022-03312-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 03/24/2022] [Indexed: 12/26/2022] Open
Abstract
DNA double-strand break (DSB) is the most severe form of DNA damage and accumulates with age, in which cytoskeletal proteins are polymerized to repair DSB in dividing cells. Since tau is a microtubule-associated protein, we investigate whether DSB is involved in tau pathologies in Alzheimer's disease (AD). First, immunohistochemistry reveals the frequent coexistence of DSB and phosphorylated tau in the cortex of AD patients. In vitro studies using primary mouse cortical neurons show that non-p-tau accumulates perinuclearly together with the tubulin after DSB induction with etoposide, followed by the accumulation of phosphorylated tau. Moreover, the knockdown of endogenous tau exacerbates DSB in neurons, suggesting the protective role of tau on DNA repair. Interestingly, synergistic exposure of neurons to microtubule disassembly and the DSB strikingly augments aberrant p-tau aggregation and apoptosis. These data suggest that DSB plays a pivotal role in AD-tau pathology and that the failure of DSB repair leads to tauopathy.
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3
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Flores-Rodríguez P, Harrington CR, Wischik CM, Ibarra-Bracamontes V, Zarco N, Navarrete A, Martínez-Maldonado A, Guadarrama-Ortíz P, Villanueva-Fierro I, Ontiveros-Torres MA, Perry G, Alonso AD, Floran-Garduño B, Segovia J, Luna-Muñoz J. Phospho-Tau Protein Expression in the Cell Cycle of SH-SY5Y Neuroblastoma Cells: A Morphological Study. J Alzheimers Dis 2020; 71:631-645. [PMID: 31424392 DOI: 10.3233/jad-190155] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
It has been reported that the main function of tau protein is to stabilize microtubules and promote the movement of organelles through the axon in neurons. In Alzheimer's disease, tau protein is the major constituent of the paired helical filament, and it undergoes post-translational modifications including hyperphosphorylation and truncation. Whether other functions of tau protein are involved in Alzheimer's disease is less clear. We used SH-SY5Y human neuroblastoma cells as an in vitro model to further study the functions of tau protein. We detected phosphorylated tau protein as small dense dots in the cell nucleus, which strongly colocalize with intranuclear speckle structures that were also labelled with an antibody to SC35, a protein involved in nuclear RNA splicing. We have shown further that tau protein, phosphorylated at the sites recognized by pT231, TG-3, and AD2 antibodies, is closely associated with cell division. Different functions may be characteristic of phosphorylation at specific sites. Our findings suggest that the presence of tau protein is involved in separation of sister chromatids in anaphase, and that tau protein also participates in maintaining the integrity of the DNA (pT231, prophase) and chromosomes during cell division (TG-3).
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Affiliation(s)
- Paola Flores-Rodríguez
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México.,Brain Bank, Laboratorio Nacional de Servicios Experimentales, LaNSE-CINVESTAV, CDMX, México.,CIIDIR Durango, Instituto Politécnico Nacional, Becario COFAA, Durango, México
| | - Charles R Harrington
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - Claude M Wischik
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - Vanessa Ibarra-Bracamontes
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México.,Brain Bank, Laboratorio Nacional de Servicios Experimentales, LaNSE-CINVESTAV, CDMX, México
| | - Natanael Zarco
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México
| | - Araceli Navarrete
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México
| | - Alejandra Martínez-Maldonado
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México.,Anahuac University North Mexico, CDMX, México
| | | | | | | | - George Perry
- College of Sciences, University of Texas at San Antonio, TX, USA
| | - Alejandra D Alonso
- Biology Department and Center for Developmental Neuroscience, College of Staten Island, The City University of New York, Staten Island, NY, USA
| | | | - José Segovia
- Deparment of Physiology, Biophysics and Neuroscience, CINVESTAV, CDMX, México
| | - José Luna-Muñoz
- Brain Bank, Laboratorio Nacional de Servicios Experimentales, LaNSE-CINVESTAV, CDMX, México
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4
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Luna-Viramontes NI, Campa-Córdoba BB, Ontiveros-Torres MÁ, Harrington CR, Villanueva-Fierro I, Guadarrama-Ortíz P, Garcés-Ramírez L, de la Cruz F, Hernandes-Alejandro M, Martínez-Robles S, González-Ballesteros E, Pacheco-Herrero M, Luna-Muñoz J. PHF-Core Tau as the Potential Initiating Event for Tau Pathology in Alzheimer's Disease. Front Cell Neurosci 2020; 14:247. [PMID: 33132840 PMCID: PMC7511711 DOI: 10.3389/fncel.2020.00247] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/15/2020] [Indexed: 11/13/2022] Open
Abstract
Worldwide, around 50 million people have dementia. Alzheimer's disease (AD) is the most common type of dementia and one of the major causes of disability and dependency among the elderly worldwide. Clinically, AD is characterized by impaired memory accompanied by other deficiencies in the cognitive domain. Neuritic plaques (NPs) and neurofibrillary tangles (NFTs) are histopathological lesions that define brains with AD. NFTs consist of abundant intracellular paired helical filaments (PHFs) whose main constituent is tau protein. Tau undergoes posttranslational changes including hyperphosphorylation and truncation, both of which favor conformational changes in the protein. The sequential pathological processing of tau is illustrated with the following specific markers: pT231, TG3, AT8, AT100, and Alz50. Two proteolysis sites for tau have been described-truncation at glutamate 391 and at aspartate 421-and which can be demonstrated by reactivity with the antibodies 423 and TauC-3, respectively. In this review, we describe the molecular changes in tau protein as pre-NFTs progress to extracellular NFTs and during which the formation of a minimal nucleus of the filament, as the PHF core, occurs. We also analyzed the PHF core as the initiator of PHFs and tau phosphorylation as a protective neuronal mechanism against the assembly of the PHF core.
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Affiliation(s)
- Nabil Itzi Luna-Viramontes
- National Dementia BioBank, Departamento de Ciencias Biológicas, Facultad de Estudios Superiores, Universidad Nacional Autónoma de México, Mexico City, Mexico.,Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - B Berenice Campa-Córdoba
- National Dementia BioBank, Departamento de Ciencias Biológicas, Facultad de Estudios Superiores, Universidad Nacional Autónoma de México, Mexico City, Mexico.,Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | | | - Charles R Harrington
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, United Kingdom
| | | | - Parménides Guadarrama-Ortíz
- Departamento de Neurocirugía, Centro Especializado en Neurocirugía y Neurociencias México, CENNM, CDMX, Mexico City, Mexico
| | - Linda Garcés-Ramírez
- Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Fidel de la Cruz
- Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Mario Hernandes-Alejandro
- Departamento de Bioingeniería, Unidad Profesional Interdisciplinaria de Biotecnología del Instituto Politécnico Nacional (UPIBI-IPN), Mexico City, México
| | - Sandra Martínez-Robles
- National Dementia BioBank, Departamento de Ciencias Biológicas, Facultad de Estudios Superiores, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Erik González-Ballesteros
- National Dementia BioBank, Departamento de Ciencias Biológicas, Facultad de Estudios Superiores, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Mar Pacheco-Herrero
- Neuroscience Research Laboratory, Faculty of Health Sciences, Pontificia Universidad Catolica Madre y Maestra, Santiago de los Caballeros, Dominican Republic
| | - José Luna-Muñoz
- National Dementia BioBank, Departamento de Ciencias Biológicas, Facultad de Estudios Superiores, Universidad Nacional Autónoma de México, Mexico City, Mexico
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5
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Zhang Z, Mu S, Chen T, Sun Z, Shu Z, Li Y, Kang X. H4S1ph, an alternative epigenetic marker for sperm maturity. Andrologia 2019; 52:e13352. [PMID: 31746491 DOI: 10.1111/and.13352] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 03/31/2019] [Accepted: 05/16/2019] [Indexed: 12/11/2022] Open
Abstract
Histone phosphorylation, an epigenetic post-translational modification, plays essential roles in male gamete chromatin compaction during spermatogenesis and sperm maturity. Previously, we studied the epigenetic marker of phosphorylated serine 1 of histone H2A and H4 (HS1ph) during spermatogenesis in mice and crabs, which was shown to be closely related to the sperm maturity. To further investigate the correlation between phosphorylated serine 1 of histone H4 (H4S1ph) and sperm maturation, a comparison study was conducted in this work between the healthy and the precocious crabs. It was discovered that the distribution of H4S1ph was similar for the two groups of crabs during spermatogenesis before maturity, but totally different in the sperm nuclei. H4S1ph vanished in the nuclei of healthy crab spermatozoa mostly, while retained in the precocious crabs just like what it was in elongated spermatid of both kinds of crabs. The results showed that a high level of H4S1ph conservation was closely associated with immaturity and might indicate inefficient fertility of male precocious crabs. Thus, H4S1ph was suggested to be an epigenetic marker of sperm maturity.
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Affiliation(s)
- Zhaohui Zhang
- College of Life Sciences, Hebei University, Baoding, China.,Department of Reproductive Medicine, Baoding First Central Hospital, Baoding, China
| | - Shumei Mu
- College of Life Sciences, Hebei University, Baoding, China
| | - Tingrong Chen
- College of Life Sciences, Hebei University, Baoding, China
| | - Zhe Sun
- College of Life Sciences, Hebei University, Baoding, China
| | - Zhiquan Shu
- School of Mechanical and Materials Engineering, Washington State University, Everett, Washington
| | - Yanqin Li
- College of Life Sciences, Hebei University, Baoding, China
| | - Xianjiang Kang
- College of Life Sciences, Hebei University, Baoding, China
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6
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Alqaeisoom N, Qian C, Arachchige D, Colvin RA, Holub JM. Inhibiting Phosphorylation of Tau (τ) Proteins at Ser262 Using Peptide-Based R1 Domain Mimetics. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9689-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Abstract
Cilia are microtubule-based structures that protrude from the apical surface of cells to mediate motility, transport, intracellular signaling, and environmental sensing. Tau tubulin kinases (TTBKs) destabilize microtubules by phosphorylating microtubule-associated proteins (MAPs) of the MAP2/Tau family, but also contribute to the assembly of primary cilia during embryogenesis. Expression of TTBKs is enriched in testicular tissue, but their relevance to reproductive processes is unknown. We identified six TTBK homologues in the genome of the planarian Schmidtea mediterranea (Smed-TTBK-a, -b, -c, -d, -e, and -f), all of which are preferentially expressed in testes. Inhibition of TTBK paralogues by RNA interference (RNAi) revealed a specific requirement for Smed-TTBK-d in postmeiotic regulation of spermatogenesis. Disrupting expression of Smed-TTBK-d results in loss of spermatozoa, but not spermatids. In the soma, Smed-TTBK-d RNAi impaired the function of multiciliated epidermal cells in propelling planarian movement, as well as the osmoregulatory function of protonephridia. Decreased density and structural defects of motile cilia were observed in the epidermis of Smed-TTBK-d(RNAi) by phase contrast, immunofluorescence, and transmission electron microscopy. Altogether, these results demonstrate that members of the TTBK family of proteins are postmeiotic regulators of sperm development and also contribute to the formation of motile cilia in the soma.
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Affiliation(s)
- Robert Alan Magley
- Department of Biological Sciences, Wright State University, Dayton, OH 45435
| | - Labib Rouhana
- Department of Biological Sciences, Wright State University, Dayton, OH 45435
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8
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Halldorsson BV, Palsson G, Stefansson OA, Jonsson H, Hardarson MT, Eggertsson HP, Gunnarsson B, Oddsson A, Halldorsson GH, Zink F, Gudjonsson SA, Frigge ML, Thorleifsson G, Sigurdsson A, Stacey SN, Sulem P, Masson G, Helgason A, Gudbjartsson DF, Thorsteinsdottir U, Stefansson K. Characterizing mutagenic effects of recombination through a sequence-level genetic map. Science 2019; 363:363/6425/eaau1043. [DOI: 10.1126/science.aau1043] [Citation(s) in RCA: 156] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 05/16/2018] [Accepted: 12/07/2018] [Indexed: 12/14/2022]
Abstract
Genetic diversity arises from recombination and de novo mutation (DNM). Using a combination of microarray genotype and whole-genome sequence data on parent-child pairs, we identified 4,531,535 crossover recombinations and 200,435 DNMs. The resulting genetic map has a resolution of 682 base pairs. Crossovers exhibit a mutagenic effect, with overrepresentation of DNMs within 1 kilobase of crossovers in males and females. In females, a higher mutation rate is observed up to 40 kilobases from crossovers, particularly for complex crossovers, which increase with maternal age. We identified 35 loci associated with the recombination rate or the location of crossovers, demonstrating extensive genetic control of meiotic recombination, and our results highlight genes linked to the formation of the synaptonemal complex as determinants of crossovers.
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9
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Liu XJ, Wei J, Shang YH, Huang HC, Lao FX. Modulation of AβPP and GSK3β by Endoplasmic Reticulum Stress and Involvement in Alzheimer's Disease. J Alzheimers Dis 2018; 57:1157-1170. [PMID: 28339396 DOI: 10.3233/jad-161111] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Alzheimer's disease (AD) is a dementia disease with neuronal loss and synaptic impairment. This impairment is caused, at least partly, by the generation of two main AD hallmarks, namely the hyperphosphorylated tau protein comprising neurofibrillary tangles and senile plaques containing amyloid-β (Aβ) peptides. The amyloid-β protein precursor (AβPP) and glycogen synthase kinase-3β (GSK3β) are two main proteins associated with AD and are closely correlated with these hallmarks. Recently, both of the proteins were reported to be modulated by endoplasmic reticulum stress (ERS) and are involved in the pathogenesis of AD. The mechanism of ERS plus the modulation of AβPP processing and GSK3β activity by ERS in AD are summarized and explored in this review.
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Affiliation(s)
- Xin-Jun Liu
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, P.R. China.,College of Arts and Science of Beijing Union University, Beijing, P.R. China
| | - Jun Wei
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, P.R. China.,College of Arts and Science of Beijing Union University, Beijing, P.R. China
| | - Ying-Hui Shang
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, P.R. China.,College of Arts and Science of Beijing Union University, Beijing, P.R. China
| | - Han-Chang Huang
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, P.R. China.,College of Arts and Science of Beijing Union University, Beijing, P.R. China
| | - Feng-Xue Lao
- Beijing Key Laboratory of Bioactive Substances and Functional Foods, Beijing Union University, Beijing, P.R. China.,College of Arts and Science of Beijing Union University, Beijing, P.R. China
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10
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Sotiropoulos I, Galas MC, Silva JM, Skoulakis E, Wegmann S, Maina MB, Blum D, Sayas CL, Mandelkow EM, Mandelkow E, Spillantini MG, Sousa N, Avila J, Medina M, Mudher A, Buee L. Atypical, non-standard functions of the microtubule associated Tau protein. Acta Neuropathol Commun 2017; 5:91. [PMID: 29187252 PMCID: PMC5707803 DOI: 10.1186/s40478-017-0489-6] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 10/30/2017] [Indexed: 12/21/2022] Open
Abstract
Since the discovery of the microtubule-associated protein Tau (MAPT) over 40 years ago, most studies have focused on Tau’s role in microtubule stability and regulation, as well as on the neuropathological consequences of Tau hyperphosphorylation and aggregation in Alzheimer’s disease (AD) brains. In recent years, however, research efforts identified new interaction partners and different sub-cellular localizations for Tau suggesting additional roles beyond its standard function as microtubule regulating protein. Moreover, despite the increasing research focus on AD over the last decades, Tau was only recently considered as a promising therapeutic target for the treatment and prevention of AD as well as for neurological pathologies beyond AD e.g. epilepsy, excitotoxicity, and environmental stress. This review will focus on atypical, non-standard roles of Tau on neuronal function and dysfunction in AD and other neurological pathologies providing novel insights about neuroplastic and neuropathological implications of Tau in both the central and the peripheral nervous system.
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11
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Shimizu T, Uchida C, Shimizu R, Motohashi H, Uchida T. Prolyl isomerase Pin1 promotes proplatelet formation of megakaryocytes via tau. Biochem Biophys Res Commun 2017; 493:946-951. [PMID: 28943044 DOI: 10.1016/j.bbrc.2017.09.115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 09/20/2017] [Indexed: 12/26/2022]
Abstract
Here we show that Pin1, a peptidyl-prolyl cis/trans isomerase which catalyzes the isomerization of phosphorylated Ser/Thr-Pro, is a regulatory molecule of thrombopoiesis. We found that mice lacking the Pin1 gene (Pin1-⁄- mice) formed more megakaryocytes (MKs) than wild type mice (WT mice), and that the proplatelet formation of MKs was poorer in Pin1-⁄- mice than WT mice. Treatment of Meg-01 cells, a megakaryoblastic floating cell line, with shRNA against Pin1 suppressed the proplatelet formation. Expression of tau, a microtubule associated protein was induced in MKs during proplatelet formation. Pin1 bound tau and promoted microtubule polymerization. Our results show that Pin1 serves as a positive regulatory molecule of proplatelet formation of MKs by enhancing the function of phosphorylated tau.
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Affiliation(s)
- Taiki Shimizu
- Molecular Enzymology, Department of Molecular Cell Science, Tohoku University, 468-1 Aoba, Aramaki, Aoba, Sendai, Miyagi 980-0845, Japan
| | - Chiyoko Uchida
- Department of Human Development and Culture, Fukushima University, 1 Kanayagawa, Fukushima, Fukushima 960-1296, Japan
| | - Ritsuko Shimizu
- Department of Molecular Hematology, Graduate School of Medicine, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Hozumi Motohashi
- Department of Gene Expression Regulation, IDAC, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Takafumi Uchida
- Molecular Enzymology, Department of Molecular Cell Science, Tohoku University, 468-1 Aoba, Aramaki, Aoba, Sendai, Miyagi 980-0845, Japan.
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12
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Sigala J, Jumeau F, Buée L, Sergeant N, Mitchell V. [The testicular microtubule-associated protein Tau: Where, when during spermatogenesis?]. Morphologie 2015; 99:141-148. [PMID: 25908520 DOI: 10.1016/j.morpho.2015.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 03/05/2015] [Accepted: 03/16/2015] [Indexed: 06/04/2023]
Abstract
The Tau protein (Tubulin Associated Unit) is a phosphoprotein of the microtubule-associated protein family (MAPs). Its role is the regulation of the microtubule polymerization. The Tau protein is naturally present in brain, heart, muscle, lung, kidney, pancreas and liver. An expression of Tau protein and RNA messengers was also highlighted in the testis that is an organ rich in microtubules. The role of microtubules is essential in the stabilization of the cellular shape and in cell divisions. In the testis, Tau protein could be involved in the division process of the spermatogenesis by acting on the microtubular dynamics in the arrangement of the spermatozoon polarity. This review synthesizes the current knowledge, the localization and the main functions of the Tau protein focused on the testis. The localization and the potential roles of the Tau protein during the spermatogenesis are discussed by emphasizing the link with the microtubular structures of seminiferous tubules.
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Affiliation(s)
- J Sigala
- Institut de biologie de la reproduction-spermiologie, CECOS, hôpital Jeanne-de-Flandre, centre hospitalier régional universitaire de Lille, avenue Eugène-Avinée, 59037 Lille cedex, France; EA 4308 gamétogenèse et qualité du gamète, France; Inserm UMR-S 1172 Alzheimer et tauopathies, place de Verdun, 59045 Lille cedex, France
| | - F Jumeau
- EA 4308 gamétogenèse et qualité du gamète, France; Inserm UMR-S 1172 Alzheimer et tauopathies, place de Verdun, 59045 Lille cedex, France; Laboratoire de biologie de la reproduction, CECOS, centre hospitalier universitaire de Rouen, 1, rue de Germont, 76031 Rouen cedex, France
| | - L Buée
- Inserm UMR-S 1172 Alzheimer et tauopathies, place de Verdun, 59045 Lille cedex, France
| | - N Sergeant
- Inserm UMR-S 1172 Alzheimer et tauopathies, place de Verdun, 59045 Lille cedex, France
| | - V Mitchell
- Institut de biologie de la reproduction-spermiologie, CECOS, hôpital Jeanne-de-Flandre, centre hospitalier régional universitaire de Lille, avenue Eugène-Avinée, 59037 Lille cedex, France; EA 4308 gamétogenèse et qualité du gamète, France.
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