1
|
Li S, Qi Y, Yu J, Hao Y, Xu L, Ding X, Zhang M, Geng J. Aurora kinase A regulates cancer-associated RNA aberrant splicing in breast cancer. Heliyon 2023; 9:e17386. [PMID: 37415951 PMCID: PMC10320321 DOI: 10.1016/j.heliyon.2023.e17386] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 06/03/2023] [Accepted: 06/15/2023] [Indexed: 07/08/2023] Open
Abstract
The contribution of oncogenes to tumor-associated RNA splicing and the relevant molecular mechanisms therein require further elaboration. Here, we show that oncogenic Aurora kinase A (AURKA) promotes breast cancer-related RNA aberrant splicing in a context-dependent manner. AURKA regulated pan-breast cancer-associated RNA splicing events including GOLGA4, RBM4 and UBQLN1. Aberrant splicing of GOLGA4 and RBM4 was closely related to breast cancer development. Mechanistically, AURKA interacted with the splicing factor YBX1 and promoted AURKA-YBX1 complex-mediated GOLGA4 exon inclusion. AURKA binding to the splicing factor hnRNPK promoted AURKA-hnRNPK complex-mediated RBM4 exon skipping. Analysis of clinical data identified an association between the AURKA-YBX1/hnRNPK complex and poor prognosis in breast cancer. Blocking AURKA nuclear translocation with small molecule drugs partially reversed the oncogenic splicing of RBM4 and GOLGA4 in breast cancer cells. In summary, oncogenic AURKA executes its function on modulating breast cancer-related RNA splicing, and nuclear AURKA is distinguished as a hopeful target in the case of treating breast cancer.
Collapse
Affiliation(s)
- Sisi Li
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, China
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian, China
| | - Yangfan Qi
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian, China
| | - Jiachuan Yu
- Department of Anesthesiology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yuchao Hao
- Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, Dalian, China
| | - Lingzhi Xu
- Department of Oncology, The Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Xudong Ding
- Department of Pathology, The Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Minghui Zhang
- Department of Oncology, Chifeng City Hospital, Chifeng, China
| | - Jingshu Geng
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, China
| |
Collapse
|
2
|
Nozawa K, Fujihara Y, Devlin DJ, Deras RE, Kent K, Larina IV, Umezu K, Yu Z, Sutton CM, Ye Q, Dean LK, Emori C, Ikawa M, Garcia TX, Matzuk MM. The testis-specific E3 ubiquitin ligase RNF133 is required for fecundity in mice. BMC Biol 2022; 20:161. [PMID: 35831855 PMCID: PMC9277888 DOI: 10.1186/s12915-022-01368-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 07/05/2022] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Ubiquitination is a post-translational modification required for a number of physiological functions regulating protein homeostasis, such as protein degradation. The endoplasmic reticulum (ER) quality control system recognizes and degrades proteins no longer needed in the ER through the ubiquitin-proteasome pathway. E2 and E3 enzymes containing a transmembrane domain have been shown to function in ER quality control. The ER transmembrane protein UBE2J1 is a E2 ubiquitin-conjugating enzyme reported to be essential for spermiogenesis at the elongating spermatid stage. Spermatids from Ube2j1 KO male mice are believed to have defects in the dislocation step of ER quality control. However, associated E3 ubiquitin-protein ligases that function during spermatogenesis remain unknown. RESULTS We identified four evolutionarily conserved testis-specific E3 ubiquitin-protein ligases [RING finger protein 133 (Rnf133); RING finger protein 148 (Rnf148); RING finger protein 151 (Rnf151); and Zinc finger SWIM-type containing 2 (Zswim2)]. Using the CRISPR/Cas9 system, we generated and analyzed the fertility of mutant mice with null alleles for each of these E3-encoding genes, as well as double and triple knockout (KO) mice. Male fertility, male reproductive organ, and sperm-associated parameters were analyzed in detail. Fecundity remained largely unaffected in Rnf148, Rnf151, and Zswim2 KO males; however, Rnf133 KO males displayed severe subfertility. Additionally, Rnf133 KO sperm exhibited abnormal morphology and reduced motility. Ultrastructural analysis demonstrated that cytoplasmic droplets were retained in Rnf133 KO spermatozoa. Although Rnf133 and Rnf148 encode paralogous genes that are chromosomally linked and encode putative ER transmembrane E3 ubiquitin-protein ligases based on their protein structures, there was limited functional redundancy of these proteins. In addition, we identified UBE2J1 as an E2 ubiquitin-conjugating protein that interacts with RNF133. CONCLUSIONS Our studies reveal that RNF133 is a testis-expressed E3 ubiquitin-protein ligase that plays a critical role for sperm function during spermiogenesis. Based on the presence of a transmembrane domain in RNF133 and its interaction with the ER containing E2 protein UBE2J1, we hypothesize that these ubiquitin-regulatory proteins function together in ER quality control during spermatogenesis.
Collapse
Affiliation(s)
- Kaori Nozawa
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Yoshitaka Fujihara
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Bioscience and Genetics, National Cerebral and Cardiovascular Center, Suita, Osaka, 564-8565, Japan
| | - Darius J Devlin
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Ricardo E Deras
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Katarzyna Kent
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Irina V Larina
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Kohei Umezu
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Zhifeng Yu
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Courtney M Sutton
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Qiuji Ye
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Laura K Dean
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Chihiro Emori
- Department of Experimental Genome Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Masahito Ikawa
- Department of Experimental Genome Research, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
| | - Thomas X Garcia
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Martin M Matzuk
- Center for Drug Discovery, Baylor College of Medicine, Houston, TX, 77030, USA.
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, 77030, USA.
| |
Collapse
|
3
|
Ding Y, Wang J, Lu J. miR-337-5p promotes the development of cardiac hypertrophy by targeting Ubiquilin-1 (UBQLN1). Bioengineered 2021; 12:6771-6781. [PMID: 34515612 PMCID: PMC8806775 DOI: 10.1080/21655979.2021.1964892] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Cardiac hypertrophy is an adaptive response of the myocardium to the pressure overload of the heart. MicroRNAs (miRNAs/miRs) are shown to be directly involved in the development of cardiac hypertrophy. However, the function of miR-337-5p and its potential contribution to the serine/threonine-protein kinase, a mammalian target of rapamycin (mTOR) signaling in cardiac hypertrophy remains unknown. In the present study, miR-337-5p expression was examined in cardiomyocytes treated with angiotensin II (Ang II). An adenovirus vector system was employed to knockdown miR-337-5p expression to investigate its functions in cardiac hypertrophy. The results revealed a significant increase in the expression of miR-337-5p in cardiomyocytes treated with Ang II as compared with controls. In addition, downregulation of miR-337-5p expression inhibited cardiac hypertrophy both in vitro and in vivo. Dual-luciferase reporter assays demonstrated Ubiquilin-1 (UBQLN1) as the direct target of miR-337-5p, and revealed its function in the modulation of mTOR signaling. Rescue experiments indicated that UBQLN1 overexpression reversed the effects of miR-337-5p, and further verified this interaction. In summary, the results of the present study show that miR-337-5p silencing attenuates cardiac hypertrophy by targeting UBQLN1. Therefore, miR-337-5p plays a critical role in cardiac hypertrophy and may serve as a new therapeutic target.
Collapse
Affiliation(s)
- Ying Ding
- Electrocardiographic Function Department, Xiangyang Central Hospital, Affiliated Hospital Of Hubei University Of Arts And Science, Xiangyang, Hubei, China
| | - Jingyu Wang
- Electrocardiographic Function Department, Xiangyang Central Hospital, Affiliated Hospital Of Hubei University Of Arts And Science, Xiangyang, Hubei, China
| | - Jun Lu
- Electrocardiographic Function Department, Xiangyang Central Hospital, Affiliated Hospital Of Hubei University Of Arts And Science, Xiangyang, Hubei, China
| |
Collapse
|
4
|
Chen X, Ebelle DL, Wright BJ, Sridharan V, Hooper E, Walters KJ. Structure of hRpn10 Bound to UBQLN2 UBL Illustrates Basis for Complementarity between Shuttle Factors and Substrates at the Proteasome. J Mol Biol 2019; 431:939-955. [PMID: 30664872 PMCID: PMC6389388 DOI: 10.1016/j.jmb.2019.01.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/07/2018] [Accepted: 01/11/2019] [Indexed: 12/14/2022]
Abstract
The 26S proteasome is a highly complex 2.5-MDa molecular machine responsible for regulated protein degradation. Proteasome substrates are typically marked by ubiquitination for recognition at receptor sites contributed by Rpn1/S2/PSMD2, Rpn10/S5a, and Rpn13/Adrm1. Each receptor site can bind substrates directly by engaging conjugated ubiquitin chains or indirectly by binding to shuttle factors Rad23/HR23, Dsk2/PLIC/UBQLN, or Ddi1, which contain a ubiquitin-like domain (UBL) that adopts the ubiquitin fold. Previous structural studies have defined how each of the proteasome receptor sites binds to ubiquitin chains as well as some of the interactions that occur with the shuttle factors. Here, we define how hRpn10 binds to the UBQLN2 UBL domain, solving the structure of this complex by NMR, and determine affinities for each UIM region by a titration experiment. UBQLN2 UBL exhibits 25-fold stronger affinity for the N-terminal UIM-1 over UIM-2 of hRpn10. Moreover, we discover that UBQLN2 UBL is fine-tuned for the hRpn10 UIM-1 site over the UIM-2 site by taking advantage of the additional contacts made available through the longer UIM-1 helix. We also test hRpn10 versatility for the various ubiquitin chains to find less specificity for any particular linkage type compared to hRpn1 and hRpn13, as expected from the flexible linker region that connects the two UIMs; nonetheless, hRpn10 does exhibit some preference for K48 and K11 linkages. Altogether, these results provide new insights into the highly complex and complementary roles of the proteasome receptor sites and shuttle factors.
Collapse
Affiliation(s)
- Xiang Chen
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Danielle L Ebelle
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Brandon J Wright
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Vinidhra Sridharan
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Evan Hooper
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA; Linganore High School, Frederick, MD 21701, USA
| | - Kylie J Walters
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.
| |
Collapse
|
5
|
Collins DW, Gudiseva HV, Chavali VRM, Trachtman B, Ramakrishnan M, Merritt WT, Pistilli M, Rossi RA, Blachon S, Sankar PS, Miller-Ellis E, Lehman A, Addis V, O'Brien JM. The MT-CO1 V83I Polymorphism is a Risk Factor for Primary Open-Angle Glaucoma in African American Men. Invest Ophthalmol Vis Sci 2018; 59:1751-1759. [PMID: 29610859 PMCID: PMC5886029 DOI: 10.1167/iovs.17-23277] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 02/23/2018] [Indexed: 01/05/2023] Open
Abstract
Purpose We investigate the function of the V83I polymorphism (m.6150G>A, rs879053914) in the mitochondrial cytochrome c oxidase subunit 1 (MT-CO1) gene and its role in African American (AA) primary open-angle glaucoma (POAG). Methods This study used Sanger sequencing (1339 cases, 850 controls), phenotypic characterization of Primary Open-Angle African American Glaucoma Genetics study (POAAGG) cases, a masked chart review of CO1 missense cases (V83I plus M117T, n = 29) versus wild type cases (n = 29), a yeast 2-hybrid (Y2H) cDNA library screen, and quantification of protein-protein interactions by Y2H and ELISA. Results The association of V83I with POAG in AA was highly significant for men (odds ratio [OR] 6.5; 95% confidence interval [CI] 2.0-21.3, P = 0.0001), but not for women (OR 1.1; 95% CI, 0.62-2.00, P = 0.78). POAG cases having CO1 double missense mutation (V83I + M117T, L1c2 haplogroup) had a higher cup-to-disc ratio (0.77 vs. 0.71, P = 0.04) and significantly worse visual function (average pattern standard deviation, 6.5 vs. 4.3, P = 0.009; average mean deviation -10.4 vs. -4.5, P = 0.006) when compared to matched wild type cases (L1b haplogroup). Interaction of the V83I region of CO1 with amyloid beta peptide (Aβ) was confirmed by ELISA assay, and this interaction was abrogated by V83I. A Y2H screen of an adult human brain cDNA library with the V83 region of CO1 as bait retrieved the UBQLN1 gene. Conclusions The V83I polymorphism was associated strongly with POAG in AA men and disrupts Aβ-binding to CO1. This region also interacts with a neuroprotective protein, UBQLN1.
Collapse
Affiliation(s)
- David W. Collins
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Harini V. Gudiseva
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Venkata R. M. Chavali
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Benjamin Trachtman
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Meera Ramakrishnan
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - William T. Merritt
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Maxwell Pistilli
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Rebecca A. Rossi
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | | | - Prithvi S. Sankar
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Eydie Miller-Ellis
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Amanda Lehman
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Victoria Addis
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Joan M. O'Brien
- Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| |
Collapse
|
6
|
Abstract
Ubiquilin 1 (UBQLN1) plays an essential role in the regulation of protein degradations which is involved in the pathophysiology of neurodegenerative diseases and cancer. This study aimed to investigate the expression level of UBQLN1 in gastric cancer and evaluated the relationship between its expression and clinicopathological characteristics, as well as prognostic of patients with gastric cancer. Immunohistochemistry (IHC) was used to detect the expression levels of UBQLN1 in 179 pairs of gastric cancer and adjacent normal tissues. The UBQLN1 was significantly upregulated in gastric cancer tissue. High UBQLN1 expression was associated with high histological grade, invasion, lymph node metastasis, and tumor node metastasis (TNM) stage III (P < .001). Multivariate Cox analysis showed that larger tumor size (HR = 3.125, 95%CI: 2.031-4.808, P < .001), histological grade 3 (HR = 15.313, 95%,CI: 8.075-29.041, P < .001), pT3 + pT4 (HR = 3.224, 95%CI: 1.389-7.483, P = .006), LNM (HR = 4.467, 95%CI: 2.404-8.302, P < .001), TNM stage III (HR = 2.152, 95%CI: 1.289-3.594, P = .003), and high UBQLN1 expression (HR = 2.547, 95%CI: 1.511-4.292, P < .001) were significantly associated with worse prognosis of patients with gastric cancer. In conclusion, high UBQLN1 expression was an independent worse prognostic factor for patients with gastric cancer.
Collapse
Affiliation(s)
- Jingjing Bao
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Xiaoqin Jiang
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Xiaowei Zhu
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Guihong Dai
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Rongrong Dou
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Xinyun Liu
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| | - Haihui Sheng
- Shanghai Engineering Center for Molecular Medicine, National Engineering Center for Biochip at Shanghai, Shanghai
| | - Zongmin Liang
- Intensive Care Unit, Taizhou People's Hospital, Taizhou, Jiangsu Province, China
| | - Hong Yu
- Department of Pathology, Taizhou People's Hospital, Taizhou, Jiangsu Province
| |
Collapse
|
7
|
Kurlawala Z, Shah PP, Shah C, Beverly LJ. The STI and UBA Domains of UBQLN1 Are Critical Determinants of Substrate Interaction and Proteostasis. J Cell Biochem 2017; 118:2261-2270. [PMID: 28075048 DOI: 10.1002/jcb.25880] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/10/2017] [Indexed: 01/24/2023]
Abstract
There are five Ubiquilin proteins (UBQLN1-4, UBQLN-L), which are evolutionarily conserved and structurally similar. UBQLN proteins have three functional domains: N-terminal ubiquitin-like domain (UBL), C-terminal ubiquitin-associated domain (UBA), and STI chaperone-like regions in the middle. Alterations in UBQLN1 gene have been detected in a variety of disorders ranging from Alzheimer's disease to cancer. UBQLN1 has been largely studied in neurodegenerative disorders in the context of protein quality control. Several studies have hypothesized that the UBA domain of UBQLN1 binds to poly-ubiquitin chains of substrate and shuttles it to the proteasome via its UBL domain for degradation. UBQLN1 either facilitates degradation (Ataxin3, EPS15) or stabilizes (PSEN1/2, BCLb) substrates it binds to. The signal that determines this fate is unknown and there is conflicting data to support the existing working model of UBQLN1. Using BCLb as a model substrate, we characterized UBQLN1-substrate interaction. We identified the first two STI domains of UBQLN1 as critical for binding to BCLb. Interaction of UBQLN1 with BCLb is independent of ubiquitination of BCLb, but interaction with ubiquitin via UBA domain is required for stabilization of BCLb. Similarly, we showed that UBQLN1 interacts with IGF1R and ESYT2 through the STI domains and stabilizes these proteins through its UBA domain. Interactions that are not dependent on STI domains, for example, UBL mediated interaction with PSMD4 and BAG6, do not appear to be stabilized by UBQLN1. We conclude that fate of substrates that UBQLN1 associates with, is interaction domain specific. J. Cell. Biochem. 118: 2261-2270, 2017. © 2017 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Zimple Kurlawala
- James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky.,Department of Pharmacology and Toxicology, School of Medicine, University of Louisville, Louisville, Kentucky
| | - Parag P Shah
- James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky
| | - Charmi Shah
- James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky
| | - Levi J Beverly
- James Graham Brown Cancer Center, University of Louisville, Louisville, Kentucky.,Department of Pharmacology and Toxicology, School of Medicine, University of Louisville, Louisville, Kentucky.,Division of Hematology and Oncology, School of Medicine, University of Louisville, Louisville, Kentucky
| |
Collapse
|
8
|
Yadav S, Singh N, Shah PP, Rowbotham DA, Malik D, Srivastav A, Shankar J, Lam WL, Lockwood WW, Beverly LJ. MIR155 Regulation of Ubiquilin1 and Ubiquilin2: Implications in Cellular Protection and Tumorigenesis. Neoplasia 2017; 19:321-332. [PMID: 28315615 PMCID: PMC5361868 DOI: 10.1016/j.neo.2017.02.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 01/31/2017] [Accepted: 02/06/2017] [Indexed: 12/15/2022] Open
Abstract
Ubiquilin (UBQLN) proteins are adaptors thought to link ubiquitinated proteins to the proteasome. However, our lab has recently reported a previously unappreciated role for loss of UBQLN in lung cancer progression. In fact, UBQLN genes are lost in over 50% of lung cancer samples examined. However, a reason for the loss of UBQLN has not been proposed, nor has a selective pressure that could lead to deletion of UBQLN been reported. Diesel Exhaust Particles (DEP) are a major concern in the large cities of developing nations and DEP exposed populations are at an increased risk of developing a number of illnesses, including lung cancer. A connection between DEP and UBQLN has never been examined. In the present study, we determined the effect of DEP on lung cell lines and were interested to determine if UBQLN proteins could potentially play a protective role following treatment with DEP. Interestingly, we found that DEP treated cells have increased expression of UBQLN proteins. In fact, over-expression of UBQLN was capable of protecting cells from DEP toxicity. To investigate the mechanism by which DEP leads to increased UBQLN protein levels, we identified and interrogated microRNAs that were predicted to regulate UBQLN mRNA. We found that DEP decreases the oncogenic microRNA, MIR155. Further, we showed that MIR155 regulates the mRNA of UBQLN1 and UBQLN2 in cells, such that increased MIR155 expression increased cell invasion, migration, wound formation and clonogenicity in UBQLN-loss dependent manner. This is the first report of an environmental carcinogen regulating expression of UBQLN proteins. We show that exposure of cells to DEP causes an increase in UBQLN levels and that MIR155 regulates mRNA of UBQLN. Thus, we propose that DEP-induced repression of MIR155 leads to increased UBQLN levels, which in turn may be a selective pressure on lung cells to lose UBQLN1.
Collapse
Affiliation(s)
- Sanjay Yadav
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202; CSIR-Indian Institute of Toxicology Research, Lucknow, UP 226001, India.
| | - Nishant Singh
- CSIR-Indian Institute of Toxicology Research, Lucknow, UP 226001, India.
| | - Parag P Shah
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202.
| | - David A Rowbotham
- Integrative Oncology, British Columbia Cancer Agency, Vancouver, B.C., Canada V5Z 1L3.
| | - Danial Malik
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202.
| | - Ankita Srivastav
- CSIR-Indian Institute of Toxicology Research, Lucknow, UP 226001, India.
| | - Jai Shankar
- CSIR-Indian Institute of Toxicology Research, Lucknow, UP 226001, India.
| | - Wan L Lam
- Integrative Oncology, British Columbia Cancer Agency, Vancouver, B.C., Canada V5Z 1L3; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, B.C., Canada V6T 2B5.
| | - William W Lockwood
- Integrative Oncology, British Columbia Cancer Agency, Vancouver, B.C., Canada V5Z 1L3; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, B.C., Canada V6T 2B5.
| | - Levi J Beverly
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202; Department of Medicine, Division of Hematology and Oncology, University of Louisville School of Medicine, Louisville, KY 40202; Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40202.
| |
Collapse
|
9
|
Chen X, Randles L, Shi K, Tarasov SG, Aihara H, Walters KJ. Structures of Rpn1 T1:Rad23 and hRpn13:hPLIC2 Reveal Distinct Binding Mechanisms between Substrate Receptors and Shuttle Factors of the Proteasome. Structure 2016; 24:1257-1270. [PMID: 27396824 DOI: 10.1016/j.str.2016.05.018] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/10/2016] [Accepted: 05/25/2016] [Indexed: 12/14/2022]
Abstract
Three receptors (Rpn1/S2/PSMD2, Rpn10/S5a, Rpn13/Adrm1) in the proteasome bind substrates by interacting with conjugated ubiquitin chains and/or shuttle factors (Rad23/HR23, Dsk2/PLIC/ubiquilin, Ddi1) that carry ubiquitinated substrates to proteasomes. We solved the structure of two such receptors with their preferred shuttle factor, namely hRpn13(Pru):hPLIC2(UBL) and scRpn1 T1:scRad23(UBL). We find that ubiquitin folds in Rad23 and Dsk2 are fine-tuned by residue substitutions to achieve high affinity for Rpn1 and Rpn13, respectively. A single substitution in hPLIC2 yields enhanced interactions with the Rpn13 ubiquitin contact surface and sterically blocks hRpn13 binding to its preferred ubiquitin chain type, K48-linked chains. Rpn1 T1 binds two ubiquitins in tandem and we find that Rad23 binds exclusively to the higher-affinity Helix28/Helix30 site. Rad23 contacts at Helix28/Helix30 are optimized compared to ubiquitin by multiple conservative amino acid substitutions. Thus, shuttle factors deliver substrates to proteasomes through fine-tuned ubiquitin-like surfaces.
Collapse
Affiliation(s)
- Xiang Chen
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Leah Randles
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Ke Shi
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Sergey G Tarasov
- Biophysics Resource, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Hideki Aihara
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Kylie J Walters
- Protein Processing Section, Structural Biophysics Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.
| |
Collapse
|
10
|
Natunen T, Takalo M, Kemppainen S, Leskelä S, Marttinen M, Kurkinen KMA, Pursiheimo JP, Sarajärvi T, Viswanathan J, Gabbouj S, Solje E, Tahvanainen E, Pirttimäki T, Kurki M, Paananen J, Rauramaa T, Miettinen P, Mäkinen P, Leinonen V, Soininen H, Airenne K, Tanzi RE, Tanila H, Haapasalo A, Hiltunen M. Relationship between ubiquilin-1 and BACE1 in human Alzheimer's disease and APdE9 transgenic mouse brain and cell-based models. Neurobiol Dis 2015; 85:187-205. [PMID: 26563932 DOI: 10.1016/j.nbd.2015.11.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 09/13/2015] [Accepted: 11/07/2015] [Indexed: 11/16/2022] Open
Abstract
Accumulation of β-amyloid (Aβ) and phosphorylated tau in the brain are central events underlying Alzheimer's disease (AD) pathogenesis. Aβ is generated from amyloid precursor protein (APP) by β-site APP-cleaving enzyme 1 (BACE1) and γ-secretase-mediated cleavages. Ubiquilin-1, a ubiquitin-like protein, genetically associates with AD and affects APP trafficking, processing and degradation. Here, we have investigated ubiquilin-1 expression in human brain in relation to AD-related neurofibrillary pathology and the effects of ubiquilin-1 overexpression on BACE1, tau, neuroinflammation, and neuronal viability in vitro in co-cultures of mouse embryonic primary cortical neurons and microglial cells under acute neuroinflammation as well as neuronal cell lines, and in vivo in the brain of APdE9 transgenic mice at the early phase of the development of Aβ pathology. Ubiquilin-1 expression was decreased in human temporal cortex in relation to the early stages of AD-related neurofibrillary pathology (Braak stages 0-II vs. III-IV). There was a trend towards a positive correlation between ubiquilin-1 and BACE1 protein levels. Consistent with this, ubiquilin-1 overexpression in the neuron-microglia co-cultures with or without the induction of neuroinflammation resulted in a significant increase in endogenously expressed BACE1 levels. Sustained ubiquilin-1 overexpression in the brain of APdE9 mice resulted in a moderate, but insignificant increase in endogenous BACE1 levels and activity, coinciding with increased levels of soluble Aβ40 and Aβ42. BACE1 levels were also significantly increased in neuronal cells co-overexpressing ubiquilin-1 and BACE1. Ubiquilin-1 overexpression led to the stabilization of BACE1 protein levels, potentially through a mechanism involving decreased degradation in the lysosomal compartment. Ubiquilin-1 overexpression did not significantly affect the neuroinflammation response, but decreased neuronal viability in the neuron-microglia co-cultures under neuroinflammation. Taken together, these results suggest that ubiquilin-1 may mechanistically participate in AD molecular pathogenesis by affecting BACE1 and thereby APP processing and Aβ accumulation.
Collapse
Affiliation(s)
- Teemu Natunen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Mari Takalo
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland; Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Susanna Kemppainen
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Stina Leskelä
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Mikael Marttinen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Kaisa M A Kurkinen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Juha-Pekka Pursiheimo
- Department of Medical Biochemistry and Genetics, Institute of Biomedicine, Turku, Finland
| | - Timo Sarajärvi
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Jayashree Viswanathan
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland
| | - Sami Gabbouj
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Eino Solje
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland
| | - Eveliina Tahvanainen
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland
| | - Tiina Pirttimäki
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Mitja Kurki
- Neurosurgery sIA Group, Kuopio University Hospital, Kuopio, Finland
| | - Jussi Paananen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Tuomas Rauramaa
- Department of Pathology, Kuopio University Hospital, Kuopio, Finland; Institute of Clinical Medicine - Pathology, University of Eastern Finland, Kuopio, Finland
| | - Pasi Miettinen
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Petra Mäkinen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Ville Leinonen
- Neurosurgery of NeuroCenter, Kuopio University Hospital, Kuopio, Finland; Neurosurgery of NeuroCenter, University of Eastern Finland, Kuopio, Finland
| | - Hilkka Soininen
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland; Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Kari Airenne
- The Department of Biotechnology and Molecular Medicine, University of Eastern Finland, Kuopio, Finland
| | - Rudolph E Tanzi
- Genetics and Aging Research Unit, Massachusetts General Hospital, Charlestown, Boston, MA 02129, United States; Harvard Medical School, Boston, MA 02129, United States
| | - Heikki Tanila
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Annakaisa Haapasalo
- Department of Neurobiology, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland; Department of Neurology, Kuopio University Hospital, Kuopio, Finland.
| | - Mikko Hiltunen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland; Department of Neurology, Kuopio University Hospital, Kuopio, Finland.
| |
Collapse
|
11
|
Haapasalo A, Viswanathan J, Kurkinen KM, Bertram L, Soininen H, Dantuma NP, Tanzi RE, Hiltunen M. Involvement of ubiquilin-1 transcript variants in protein degradation and accumulation. Commun Integr Biol 2014. [DOI: 10.4161/cib.15283] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
|
12
|
Shah PP, Lockwood WW, Saurabh K, Kurlawala Z, Shannon SP, Waigel S, Zacharias W, Beverly LJ. Ubiquilin1 represses migration and epithelial-to-mesenchymal transition of human non-small cell lung cancer cells. Oncogene 2014; 34:1709-17. [PMID: 24747970 PMCID: PMC4205225 DOI: 10.1038/onc.2014.97] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 03/10/2014] [Accepted: 03/10/2014] [Indexed: 02/06/2023]
Abstract
Ubiquilin1 (UBQLN1) is a ubiquitin-like domain and a ubiquitin-associated domain containing protein that has been reported to be involved in shuttling proteins to the proteasome, especially during endoplasmic reticulum-associated protein degradation (ERAD). Thus, UBQLN1 function has been shown to be critical for combating a number of neurological disorders caused by protein aggregation, such as Amyotrophic lateral sclerosis (ALS), Alzheimer’s disease and Huntington’s disease. A role for UBQLN1 in regulating processes involved in tumorigenesis has not been demonstrated. Herein, we show that loss of UBQLN1 causes increased cell migration and invasion, actin cytoskeleton reorganization and induction of epithelial mesenchymal transition (EMT). Loss of UBQLN1 results in a significant decrease in the expression of epithelial markers including E-cadherin and claudin1, whereas expression of mesenchymal markers including Vimentin, Snail and ZEB1 are significantly elevated. Interestingly, we found that ZEB1 is required for induction of mesenchymal-like properties following loss of UBQLN1 and ZEB1 is capable of repressing expression of UBQLN1, suggesting a physiological, reciprocal regulation of EMT by UBQLN1 and ZEB1. Further, we find evidence for a role for UBQLN2 in also regulating EMT and cell migration. These observations have potential clinical relevance because the UBQLN1 gene is lost and under-expressed in a large percentage of human cancer cell lines and primary human lung cancer samples and recurrent mutations in both all five Ubiquilin family members have been identified in human lung cancers. Taken together, our results suggest for the first time a role for Ubiquilin family members in cancer biology.
Collapse
Affiliation(s)
- P P Shah
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA
| | - W W Lockwood
- Cancer Biology and Genetics Section, Cancer Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA
| | - K Saurabh
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA
| | - Z Kurlawala
- 1] James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA [2] Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY, USA
| | - S P Shannon
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA
| | - S Waigel
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA
| | - W Zacharias
- 1] James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA [2] Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY, USA [3] Division of Hematology and Oncology, Department of Medicine, University of Louisville School of Medicine, Louisville, KY, USA
| | - L J Beverly
- 1] James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA [2] Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY, USA [3] Division of Hematology and Oncology, Department of Medicine, University of Louisville School of Medicine, Louisville, KY, USA
| |
Collapse
|
13
|
Viswanathan J, Haapasalo A, Kurkinen KMA, Natunen T, Mäkinen P, Bertram L, Soininen H, Tanzi RE, Hiltunen M. Ubiquilin-1 Modulates γ-Secretase-Mediated ε-Site Cleavage in Neuronal Cells. Biochemistry 2013; 52:3899-912. [DOI: 10.1021/bi400138p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jayashree Viswanathan
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Annakaisa Haapasalo
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Kaisa M. A. Kurkinen
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Teemu Natunen
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Petra Mäkinen
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Lars Bertram
- Department of Vertebrate Genomics, Max-Planck-Institute for Molecular Genetics, Berlin,
Germany
| | - Hilkka Soininen
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | - Rudolph E. Tanzi
- Genetics and Aging
Research Unit, Massachusetts General Hospital/Harvard Medical School, Charlestown, Massachusetts 02129, United
States
| | - Mikko Hiltunen
- Institute of Clinical Medicine-Neurology, University of Eastern Finland, and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| |
Collapse
|
14
|
Takalo M, Haapasalo A, Natunen T, Viswanathan J, Kurkinen KM, Tanzi RE, Soininen H, Hiltunen M. Targeting ubiquilin-1 in Alzheimer's disease. Expert Opin Ther Targets 2013; 17:795-810. [PMID: 23600477 DOI: 10.1517/14728222.2013.791284] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
INTRODUCTION Alzheimer's disease (AD) is a common neurodegenerative disorder affecting an increasing number of people worldwide as the population ages. Currently, there are no drugs available that could prevent AD pathogenesis or slow down its progression. Increasing evidence links ubiquilin-1, an ubiquitin-like protein, into the pathogenic mechanisms of AD and other neurodegenerative diseases. Ubiquilin-1 has been shown to play a key role in the regulation of the levels, subcellular targeting, aggregation and degradation of various neurodegenerative disease-associated proteins. These include the amyloid precursor protein and presenilins that are intimately involved in the mechanisms of AD. AREAS COVERED Here, the properties and diverse functions of ubiquilin-1 protein in the context of the pathogenesis of AD and other neurodegenerative disorders are discussed. This review recapitulates the available knowledge on the involvement of ubiquilin-1 in the genetic and molecular mechanisms in AD. Furthermore, the association of ubiquilin-1 with specific proteins and mechanisms involved in the pathogenesis of neurodegenerative diseases is described and the known ubiquilin-1-interacting proteins summarized. EXPERT OPINION The variety of ubiquilin-1-interacting proteins and its central role in the regulation of protein levels and degradation provides a number of novel candidates and approaches for future research and drug discovery.
Collapse
Affiliation(s)
- Mari Takalo
- Institute of Clinical Medicine-Neurology, University of Eastern Finland and Department of Neurology, Kuopio University Hospital, Kuopio, Finland
| | | | | | | | | | | | | | | |
Collapse
|
15
|
Ubiquitination, localization, and stability of an anti-apoptotic BCL2-like protein, BCL2L10/BCLb, are regulated by Ubiquilin1. Proc Natl Acad Sci U S A 2012; 109:E119-26. [PMID: 22233804 DOI: 10.1073/pnas.1119167109] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We have previously shown that all six members of the anti-apoptotic BCL2 gene family can cooperate with (myelocytomatosis oncogene) MYC in a mouse model of leukemia, but three of them are significantly less potent contributors to leukemogenicity than the other three. The protein encoded by one of these less potent genes, BCL2L10/BCLb, was recently shown to vary dramatically in many primary human cancers by immunohistochemistry, and the protein levels were inversely correlated with survival in patients with several cancer types. We examined BCLb mRNA in a panel of human cancer cell lines and did not observe the extensive variation in mRNA that would be required to explain the vast differences in protein levels. We found that the levels of BCLb protein diminish quickly after inhibition of protein synthesis with cycloheximide, so we searched for interacting proteins that might affect posttranslational stability of BCLb. Using a variety of approaches, including immunoaffinity and mass spectrometry, we identified a protein, Ubiquilin1 (Ubqln), that specifically interacts with BCLb, and not with other anti-apoptotic BCL2-like proteins. Ubqln stabilizes BCLb protein, while also promoting monoubiquitination on multiple lysine residues and relocation to the cytosol. Furthermore, primary lung adencarcinomas have more Ubqln mRNA than normal adjacent lung tissue, and higher Ubqln mRNA levels are associated with shorter survival of lung cancer patients, suggesting that potentiation of the anti-apoptotic potential of BCLb through regulation of its stability by Ubqln may be an important factor in tumor progression.
Collapse
|
16
|
Haapasalo A, Viswanathan J, Kurkinen KM, Bertram L, Soininen H, Dantuma NP, Tanzi RE, Hiltunen M. Involvement of ubiquilin-1 transcript variants in protein degradation and accumulation. Commun Integr Biol 2011; 4:428-32. [PMID: 21966562 DOI: 10.4161/cib.4.4.15283] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Accepted: 02/24/2011] [Indexed: 11/19/2022] Open
Abstract
Controlled management of protein levels and quality is essential for normal cellular function. Specific molecular chaperones and foldases monitor the levels and assist correct folding of proteins. The ubiquitin-proteasome system recognizes and degrades misfolded proteins that can otherwise be harmful to cells. However, when misfolded or aggregated proteins excessively accumulate, they may be sequestered to the microtubule-organizing center to form aggresomes. These may then be removed from cells by autophagocytosis. Abnormal protein accumulation and aggregation is a common hallmark of many neurodegenerative diseases. In a recent study, we provide evidence that specific transcript variants (TVs) of ubiquilin-1, which are genetically and functionally associated to Alzheimer's disease (AD), regulate proteasomal and aggresomal targeting of presenilin-1 (PS1), a key player in AD pathogenesis. Our study together with current data provide interesting implications for ubiquilin-1 and its TVs in the pathogenesis of AD and other neurodegenerative diseases involving abnormal protein aggregation.
Collapse
Affiliation(s)
- Annakaisa Haapasalo
- Institute of Clinical Medicine - Neurology; University of Eastern Finland; Kuopio, Finland
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Viswanathan J, Haapasalo A, Böttcher C, Miettinen R, Kurkinen KMA, Lu A, Thomas A, Maynard CJ, Romano D, Hyman BT, Berezovska O, Bertram L, Soininen H, Dantuma NP, Tanzi RE, Hiltunen M. Alzheimer's disease-associated ubiquilin-1 regulates presenilin-1 accumulation and aggresome formation. Traffic 2011; 12:330-48. [PMID: 21143716 DOI: 10.1111/j.1600-0854.2010.01149.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Alzheimer's disease (AD)-associated ubiquilin-1 regulates proteasomal degradation of proteins, including presenilin (PS). PS-dependent γ-secretase generates β-amyloid (Aβ) peptides, which excessively accumulate in AD brain. Here, we have characterized the effects of naturally occurring ubiquilin-1 transcript variants (TVs) on the levels and subcellular localization of PS1 and other γ-secretase complex components and subsequent γ-secretase function in human embryonic kidney 293, human neuroblastoma SH-SY5Y and mouse primary cortical cells. Full-length ubiquilin-1 TV1 and TV3 that lacks the proteasome-interaction domain increased full-length PS1 levels as well as induced accumulation of high-molecular-weight PS1 and aggresome formation. Accumulated PS1 colocalized with TV1 or TV3 in the aggresomes. Electron microscopy indicated that aggresomes containing TV1 or TV3 were targeted to autophagosomes. TV1- and TV3-expressing cells did not accumulate other unrelated proteasome substrates, suggesting that the increase in PS1 levels was not because of a general impairment of the ubiquitin-proteasome system. Furthermore, PS1 accumulation and aggresome formation coincided with alterations in Aβ levels, particularly in cells overexpressing TV3. These effects were not related to altered γ-secretase activity or PS1 binding to TV3. Collectively, our results indicate that specific ubiquilin-1 TVs can cause PS1 accumulation and aggresome formation, which may impact AD pathogenesis or susceptibility.
Collapse
Affiliation(s)
- Jayashree Viswanathan
- Institute of Clinical Medicine-Department of Neurology, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Abdel Rassoul R, Alves S, Pantesco V, De Vos J, Michel B, Perret M, Mestre-Francés N, Verdier JM, Devau G. Distinct transcriptome expression of the temporal cortex of the primate Microcebus murinus during brain aging versus Alzheimer's disease-like pathology. PLoS One 2010; 5. [PMID: 20862281 PMCID: PMC2940844 DOI: 10.1371/journal.pone.0012770] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Accepted: 08/01/2010] [Indexed: 11/24/2022] Open
Abstract
Aging is the primary risk factor of neurodegenerative disorders such as Alzheimer's disease (AD). However, the molecular events occurring during brain aging are extremely complex and still largely unknown. For a better understanding of these age-associated modifications, animal models as close as possible to humans are needed. We thus analyzed the transcriptome of the temporal cortex of the primate Microcebus murinus using human oligonucleotide microarrays (Affymetrix). Gene expression profiles were assessed in the temporal cortex of 6 young adults, 10 healthy old animals and 2 old, “AD-like” animals that presented ß-amyloid plaques and cortical atrophy, which are pathognomonic signs of AD in humans. Gene expression data of the 14,911 genes that were detected in at least 3 samples were analyzed. By SAM (significance analysis of microarrays), we identified 47 genes that discriminated young from healthy old and “AD-like” animals. These findings were confirmed by principal component analysis (PCA). ANOVA of the expression data from the three groups identified 695 genes (including the 47 genes previously identified by SAM and PCA) with significant changes of expression in old and “AD-like” in comparison to young animals. About one third of these genes showed similar changes of expression in healthy aging and in “AD-like” animals, whereas more than two thirds showed opposite changes in these two groups in comparison to young animals. Hierarchical clustering analysis of the 695 markers indicated that each group had distinct expression profiles which characterized each group, especially the “AD-like” group. Functional categorization showed that most of the genes that were up-regulated in healthy old animals and down-regulated in “AD-like” animals belonged to metabolic pathways, particularly protein synthesis. These data suggest the existence of compensatory mechanisms during physiological brain aging that disappear in “AD-like” animals. These results open the way to new exploration of physiological and “AD-like” aging in primates.
Collapse
Affiliation(s)
- Ronza Abdel Rassoul
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
| | - Sabine Alves
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
| | - Véronique Pantesco
- CHU Montpellier, Institute for Research in Biotherapy, Hôpital Saint-Eloi, Montpellier, France
| | - John De Vos
- CHU Montpellier, Institute for Research in Biotherapy, Hôpital Saint-Eloi, Montpellier, France
| | - Bernard Michel
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
- Service de Neurologie, Hôpital Ste Marguerite, Marseille, France
| | | | - Nadine Mestre-Francés
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
| | - Jean-Michel Verdier
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
| | - Gina Devau
- Université Montpellier 2, Montpellier, France; Inserm U710, Montpellier, France; EPHE, Paris, France
- * E-mail:
| |
Collapse
|
19
|
Emerging role of Alzheimer's disease-associated ubiquilin-1 in protein aggregation. Biochem Soc Trans 2010; 38:150-5. [PMID: 20074050 DOI: 10.1042/bst0380150] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Abnormal protein aggregation and intracellular or extracellular accumulation of misfolded and aggregated proteins are key events in the pathogenesis of different neurodegenerative diseases. Furthermore, endoplasmic reticulum stress and impairment of the ubiquitin-proteasome system probably contribute to neurodegeneration in these diseases. A characteristic feature of AD (Alzheimer's disease) is the abnormal accumulation of Abeta (amyloid beta-peptide) in the brain. Evidence shows that the AD-associated PS (presenilin) also forms aggregates under certain conditions and that another AD-associated protein, ubiquilin-1, controls protein aggregation and deposition of aggregated proteins. Here, we review the current knowledge of ubiquilin-1 and PS in protein aggregation and related events that potentially influence neurodegeneration.
Collapse
|
20
|
Caccamo A, Majumder S, Deng JJ, Bai Y, Thornton FB, Oddo S. Rapamycin rescues TDP-43 mislocalization and the associated low molecular mass neurofilament instability. J Biol Chem 2009; 284:27416-24. [PMID: 19651785 DOI: 10.1074/jbc.m109.031278] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
TDP-43 is a nuclear protein involved in exon skipping and alternative splicing. Recently, TDP-43 has been identified as the pathological signature protein in frontotemporal lobar degeneration with ubiquitin-positive inclusions and in amyotrophic lateral sclerosis. In addition, TDP-43-positive inclusions are present in Parkinson disease, dementia with Lewy bodies, and 30% of Alzheimer disease cases. Pathological TDP-43 is redistributed from the nucleus to the cytoplasm, where it accumulates. An approximately 25-kDa C-terminal fragment of TDP-43 accumulates in affected brain regions, suggesting that it may be involved in the disease pathogenesis. Here, we show that overexpression of the 25-kDa C-terminal fragment is sufficient to cause the mislocalization and cytoplasmic accumulation of endogenous full-length TDP-43 in two different cell lines, thus recapitulating a key biochemical characteristic of TDP-43 proteinopathies. We also found that TDP-43 mislocalization is associated with a reduction in the low molecular mass neurofilament mRNA levels. Notably, we show that the autophagic system plays a role in TDP-43 metabolism. Specifically, we found that autophagy inhibition increases the accumulation of the C-terminal fragments of TDP-43, whereas inhibition of mTOR, a key protein kinase involved in autophagy regulation, reduces the 25-kDa C-terminal fragment accumulation and restores TDP-43 localization. Our results suggest that autophagy induction may be a valid therapeutic target for TDP-43 proteinopathies.
Collapse
Affiliation(s)
- Antonella Caccamo
- Department of Physiology, University of Texas Health Science Center, San Antonio, Texas 78229, USA
| | | | | | | | | | | |
Collapse
|
21
|
Jellinger KA. Recent advances in our understanding of neurodegeneration. J Neural Transm (Vienna) 2009; 116:1111-62. [DOI: 10.1007/s00702-009-0240-y] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Accepted: 05/05/2009] [Indexed: 12/12/2022]
|
22
|
Ubiquitin-like and ubiquitin-associated domain proteins: significance in proteasomal degradation. Cell Mol Life Sci 2009; 66:2819-33. [PMID: 19468686 DOI: 10.1007/s00018-009-0048-9] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Revised: 04/14/2009] [Accepted: 04/29/2009] [Indexed: 10/20/2022]
Abstract
The ubiquitin-proteasome pathway of protein degradation is one of the major mechanisms that are involved in the maintenance of the proper levels of cellular proteins. The regulation of proteasomal degradation thus ensures proper cell functions. The family of proteins containing ubiquitin-like (UbL) and ubiquitin-associated (UBA) domains has been implicated in proteasomal degradation. UbL-UBA domain containing proteins associate with substrates destined for degradation as well as with subunits of the proteasome, thus regulating the proper turnover of proteins.
Collapse
|