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Eroglu B, Jin X, Deane S, Öztürk B, Ross OA, Moskophidis D, Mivechi NF. Dusp26 phosphatase regulates mitochondrial respiration and oxidative stress and protects neuronal cell death. Cell Mol Life Sci 2022; 79:198. [PMID: 35313355 PMCID: PMC10601927 DOI: 10.1007/s00018-022-04162-z] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 01/04/2022] [Accepted: 01/21/2022] [Indexed: 11/29/2022]
Abstract
The dual specificity protein phosphatases (Dusps) control dephosphorylation of mitogen-activated protein kinases (MAPKs) as well as other substrates. Here, we report that Dusp26, which is highly expressed in neuroblastoma cells and primary neurons is targeted to the mitochondrial outer membrane via its NH2-terminal mitochondrial targeting sequence. Loss of Dusp26 has a significant impact on mitochondrial function that is associated with increased levels of reactive oxygen species (ROS), reduction in ATP generation, reduction in mitochondria motility and release of mitochondrial HtrA2 protease into the cytoplasm. The mitochondrial dysregulation in dusp26-deficient neuroblastoma cells leads to the inhibition of cell proliferation and cell death. In vivo, Dusp26 is highly expressed in neurons in different brain regions, including cortex and midbrain (MB). Ablation of Dusp26 in mouse model leads to dopaminergic (DA) neuronal cell loss in the substantia nigra par compacta (SNpc), inflammatory response in MB and striatum, and phenotypes that are normally associated with Neurodegenerative diseases. Consistent with the data from our mouse model, Dusp26 expressing cells are significantly reduced in the SNpc of Parkinson's Disease patients. The underlying mechanism of DA neuronal death is that loss of Dusp26 in neurons increases mitochondrial ROS and concurrent activation of MAPK/p38 signaling pathway and inflammatory response. Our results suggest that regulation of mitochondrial-associated protein phosphorylation is essential for the maintenance of mitochondrial homeostasis and dysregulation of this process may contribute to the initiation and development of neurodegenerative diseases.
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Affiliation(s)
- Binnur Eroglu
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA
| | - Xiongjie Jin
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA
| | - Sadiki Deane
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Bahadır Öztürk
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA
- Medical Biochemistry Department, Selcuk University Medical Faculty, Konya, Turkey
| | - Owen A Ross
- Mayo Clinic, 4500 San Pablo Rd., Jacksonville, FL, 32224, USA
| | - Demetrius Moskophidis
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA.
- Department of Medicine, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA.
| | - Nahid F Mivechi
- Molecular Chaperone Biology, Georgia Cancer Center, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA.
- Departments of Radiation Oncology, Medical College of Georgia at Augusta University, 1120 15th St., CN3153, Augusta, GA, 30912, USA.
- Charlie Norwood VAMC, One Freedom Way, Augusta, GA, 30904, USA.
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Xu R, Yu H, Wang J, Duan P, Zhang B, Li J, Li Y, Xu J, Lyu J, Li N, Chai T, Li Y. A mitogen-activated protein kinase phosphatase influences grain size and weight in rice. Plant J 2018; 95:937-946. [PMID: 29775492 DOI: 10.1111/tpj.13971] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/08/2018] [Accepted: 05/09/2018] [Indexed: 05/05/2023]
Abstract
Grain size and weight are directly associated with grain yield in crops. However, the molecular mechanisms that set final grain size and weight remain largely unknown. Here, we characterize two large grain mutants, large grain8-1 (large8-1) and large grain8-2 (large8-2). LARGE8 encodes the mitogen-activated protein kinase phosphatase1 (OsMKP1). Loss of function mutations in OsMKP1 results in large grains, while overexpression of OsMKP1 leads to small grains. OsMKP1 determines grain size by restricting cell proliferation in grain hulls. OsMKP1 directly interacts with and deactivates the mitogen-activated protein kinase 6 (OsMAPK6). Taken together, we identify OsMKP1 as a crucial factor that influences grain size by deactivating OsMAPK6, indicating that the reversible phosphorylation of OsMAPK6 plays important roles in determining grain size in rice.
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Affiliation(s)
- Ran Xu
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Haiyue Yu
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Junmin Wang
- Institute of Crop Science and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Penggen Duan
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Baolan Zhang
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jing Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Yu Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Jinsong Xu
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jia Lyu
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Na Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Tuanyao Chai
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Yunhai Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
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Umbrasaite J, Schweighofer A, Kazanaviciute V, Magyar Z, Ayatollahi Z, Unterwurzacher V, Choopayak C, Boniecka J, Murray JAH, Bogre L, Meskiene I. MAPK phosphatase AP2C3 induces ectopic proliferation of epidermal cells leading to stomata development in Arabidopsis. PLoS One 2010; 5:e15357. [PMID: 21203456 PMCID: PMC3009721 DOI: 10.1371/journal.pone.0015357] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Accepted: 11/15/2010] [Indexed: 12/21/2022] Open
Abstract
In plant post-embryonic epidermis mitogen-activated protein kinase (MAPK) signaling promotes differentiation of pavement cells and inhibits initiation of stomata. Stomata are cells specialized to modulate gas exchange and water loss. Arabidopsis MAPKs MPK3 and MPK6 are at the core of the signaling cascade; however, it is not well understood how the activity of these pleiotropic MAPKs is constrained spatially so that pavement cell differentiation is promoted only outside the stomata lineage. Here we identified a PP2C-type phosphatase termed AP2C3 (Arabidopsis protein phosphatase 2C) that is expressed distinctively during stomata development as well as interacts and inactivates MPK3, MPK4 and MPK6. AP2C3 co-localizes with MAPKs within the nucleus and this localization depends on its N-terminal extension. We show that other closely related phosphatases AP2C2 and AP2C4 are also MAPK phosphatases acting on MPK6, but have a distinct expression pattern from AP2C3. In accordance with this, only AP2C3 ectopic expression is able to stimulate cell proliferation leading to excess stomata development. This function of AP2C3 relies on the domains required for MAPK docking and intracellular localization. Concomitantly, the constitutive and inducible AP2C3 expression deregulates E2F-RB pathway, promotes the abundance and activity of CDKA, as well as changes of CDKB1;1 forms. We suggest that AP2C3 downregulates the MAPK signaling activity to help maintain the balance between differentiation of stomata and pavement cells.
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Affiliation(s)
- Julija Umbrasaite
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
| | - Alois Schweighofer
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
- Max-Planck-Institute of Molecular Plant Physiology, Potsdam, Germany
| | - Vaiva Kazanaviciute
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
- Institute of Biotechnology, University of Vilnius, Vilnius, Lithuania
| | - Zoltan Magyar
- School of Biological Sciences, Royal Holloway University of London, Egham, United Kingdom
- Biological Research Centre, Institute of Plant Biology, Szeged, Hungary
| | - Zahra Ayatollahi
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
| | | | - Chonnanit Choopayak
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
| | - Justyna Boniecka
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
| | - James A. H. Murray
- Cardiff School of Biosciences, Cardiff University, Cardiff, United Kingdom
| | - Laszlo Bogre
- School of Biological Sciences, Royal Holloway University of London, Egham, United Kingdom
| | - Irute Meskiene
- Max F. Perutz Laboratories, Vienna Biocenter, University of Vienna, Vienna, Austria
- Institute of Biotechnology, University of Vilnius, Vilnius, Lithuania
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Abstract
The mitogen-activated protein kinase (MAPK) phosphatases (MKPs) are a family of dual-specificity protein phosphatases that dephosphorylate both phospho-threonine and phospho-tyrosine residues in MAP kinases, including the c-Jun N-terminal protein kinase (JNK)/stress-activated protein kinase (SAPK), the p38 MAPK, and the extracellular signal-related kinase (ERK). Since phosphorylation is required for the activation of MAP kinases, dephosphorylation by MKPs inhibits MAPK activity, thereby negatively regulating MAPK signaling. It is known that deregulation of MAPK signaling is the most common alteration in human cancers. Recent studies have suggested that MKPs play an important role not only in the development of cancers, but also in the response of cancer cells to chemotherapy. Thus, understanding the roles of MKPs in the development of cancer and their impact on chemotherapy can be exploited for therapeutic benefits for the treatment of human cancer.
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Affiliation(s)
- Gen Sheng Wu
- Program in Molecular Biology and Genetics, Department of Pathology, Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA.
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