1
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Syahirah R, Hsu AY, Deng Q. A curious case of cyclin‐dependent kinases in neutrophils. J Leukoc Biol 2022; 111:1057-1068. [PMID: 35188696 PMCID: PMC9035055 DOI: 10.1002/jlb.2ru1021-573r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 01/21/2022] [Accepted: 01/31/2022] [Indexed: 12/11/2022] Open
Abstract
Neutrophils are terminally differentiated, short-lived white blood cells critical for innate immunity. Although cyclin-dependent kinases (CDKs) are typically related to cell cycle progression, increasing evidence has shown that they regulate essential functions of neutrophils. This review highlights the roles of CDKs and their partners, cyclins, in neutrophils, outside of cell cycle regulation. CDK1-10 and several cyclins are expressed in neutrophils, albeit at different levels. Observed phenotypes associated with specific inhibition or genetic loss of CDK2 indicate its role in modulating neutrophil migration. CDK4 and 6 regulate neutrophil extracellular traps (NETs) formation, while CDK5 regulates neutrophil degranulation. CDK7 and 9 are critical in neutrophil apoptosis, contributing to inflammation resolution. In addition to the CDKs that regulate mature neutrophil functions, cyclins are essential in hematopoiesis and granulopoiesis. The pivotal roles of CDKs in neutrophils present an untapped potential in targeting CDKs for treating neutrophil-dominant inflammatory diseases and understanding the regulation of the neutrophil life cycle.
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Affiliation(s)
- Ramizah Syahirah
- Department of Biological Sciences Purdue University West Lafayette Indiana USA
| | - Alan Y. Hsu
- Department of Biological Sciences Purdue University West Lafayette Indiana USA
- Department of Pathology Harvard Medical School Boston Massachusetts USA
- Department of Laboratory Medicine The Stem Cell Program, Boston Children's Hospital Boston Massachusetts USA
| | - Qing Deng
- Department of Biological Sciences Purdue University West Lafayette Indiana USA
- Purdue Institute of Inflammation Immunology and Infectious Disease, Purdue University West Lafayette Indiana USA
- Purdue University Center for Cancer Research, Purdue University West Lafayette Indiana USA
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2
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Calpain Inhibitors as Potential Therapeutic Modulators in Neurodegenerative Diseases. Neurochem Res 2022; 47:1125-1149. [PMID: 34982393 DOI: 10.1007/s11064-021-03521-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 02/07/2023]
Abstract
It is considered a significant challenge to understand the neuronal cell death mechanisms with a suitable cure for neurodegenerative disorders in the coming years. Calpains are one of the best-considered "cysteine proteases activated" in brain disorders. Calpain is an important marker and mediator in the pathophysiology of neurodegeneration. Calpain activation being the essential neurodegenerative factor causing apoptotic machinery activation, it is crucial to develop reliable and effective approaches to prevent calpain-mediated apoptosis in degenerating neurons. It has been recently seen that the "inhibition of calpain activation" has appeared as a possible therapeutic target for managing neurodegenerative diseases. A systematic literature review of PubMed, Medline, Bentham, Scopus, and EMBASE (Elsevier) databases was conducted. The present article reviews the basic pathobiology and role of selective calpain inhibitors used in various neurodegenerative diseases as a therapeutic target.
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3
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Liu B, Li L, Yang G, Geng C, Luo Y, Wu W, Manyam GC, Korentzelos D, Park S, Tang Z, Wu C, Dong Z, Sigouros M, Sboner A, Beltran H, Chen Y, Corn PG, Tetzlaff MT, Troncoso P, Broom B, Thompson TC. PARP Inhibition Suppresses GR-MYCN-CDK5-RB1-E2F1 Signaling and Neuroendocrine Differentiation in Castration-Resistant Prostate Cancer. Clin Cancer Res 2019; 25:6839-6851. [PMID: 31439587 DOI: 10.1158/1078-0432.ccr-19-0317] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/25/2019] [Accepted: 08/15/2019] [Indexed: 12/14/2022]
Abstract
PURPOSE In this study, we addressed the underlying mechanisms for the association between enzalutamide (ENZ) treatment and neuroendocrine prostate cancer (NEPC), and the critical involvement of MYCN, and loss of RB1 function in neuroendocrine differentiation (NED) of prostatic epithelial cells, and the development of NEPC. We further sought to determine whether PARP inhibition could suppress NEPC, and to identify molecular determinants of this therapeutic activity. EXPERIMENTAL DESIGN We used a novel prostate cancer patient-derived xenograft (PDX) treatment model, prostatic adenocarcinoma and NEPC cell lines, an NEPC organoid line, and NEPC xenograft models to address the mechanistic basis of ENZ-induced NED, and to analyze suppression of NED and NEPC growth by PARP inhibition. RESULTS We identified an ENZ treatment-associated glucocorticoid receptor (GR)-MYCN-CDK5-RB1-E2F1 signaling pathway that drives NED in prostatic adenocarcinoma PDX and cell line models. Mechanistically, long-term ENZ treatment transcriptionally upregulates signaling of the GR-MYCN axis, leading to CDK5R1 and CDK5R2 upregulation, Rb1 phosphorylation, and N-Myc-mediated and E2F1-mediated NED gene expression. Importantly, olaparib (OLA) or talazoparib (TALA) suppressed these activities, and the combination of OLA and dinaciclib (DINA), an inhibitor of CDK2 and CDK5, which also inhibits Rb1 phosphorylation, suppressed NED and significantly improved therapeutic efficiency in NEPC cells in vitro and in NEPC tumors in vivo. CONCLUSIONS The results of our study indicate an important role of GR-MYCN-CDK5R1/2-RB1-NED signaling in ENZ-induced and PARP inhibitor-suppressed NEPC. We also demonstrated efficacy for OLA+DINA combination therapy in NEPC xenograft models.
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Affiliation(s)
- Bo Liu
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Likun Li
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Guang Yang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Chuandong Geng
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Yong Luo
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Wenhui Wu
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ganiraju C Manyam
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Dimitrios Korentzelos
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Sanghee Park
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Zhe Tang
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Cheng Wu
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Zhenyang Dong
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Michael Sigouros
- Department of Medicine, Weill Cornell Medical College, New York, New York
| | - Andrea Sboner
- Englander Institute for Precision Medicine, Weill Cornell Medical College and New York Presbyterian Hospital, New York, New York.,Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, New York.,Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | - Himisha Beltran
- Department of Medical Oncology, Dana Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts
| | - Yu Chen
- Department of Medicine, Weill Cornell Medical College, New York, New York.,Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, New York.,Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Paul G Corn
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Michael T Tetzlaff
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Patricia Troncoso
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Bradley Broom
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Timothy C Thompson
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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4
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Zhang M, Liu Y, Liu M, Liu B, Li N, Dong X, Hong Z, Chai Y. UHPLC-QTOF/MS-based metabolomics investigation for the protective mechanism of Danshen in Alzheimer's disease cell model induced by Aβ 1-42. Metabolomics 2019; 15:13. [PMID: 30830431 DOI: 10.1007/s11306-019-1473-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/09/2019] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Alzheimer's disease (AD) is a chronic neurodegenerative disorder with neither definitive pathogenesis nor effective therapy so far. Danshen, the dried root and rhizome of Salvia miltiorrhiza Bunge, is used extensively in Alzheimer's disease treatment to ameliorate the symptoms, but the underlying mechanism remains to be clarified. OBJECTIVES To investigate potential biomarkers for AD and elucidate the protective mechanism of Danshen on AD cell model. METHODS An ultra high performance liquid chromatography-quadrupole time of flight mass spectrometry (UHPLC-QTOF/MS)-based approach combined with partial least squares discriminant analysis (PLS-DA) has been developed to discriminate the metabolic modifications between human brain microvascular endothelial cell (hBMEC) and AD cell model induced by amyloid-β protein (Aβ1-42). To further elucidate the pathophysiology of AD, related metabolic pathways have been studied. RESULTS Thirty-three distinct potential biomarkers were screened out and considered as potential biomarkers corresponding to AD, which were mostly improved and partially restored back to normalcy in Danshen pre-protection group. It was found that AD was closely related to disturbed arginine and proline metabolism, glutathione metabolism, alanine aspartate and glutamate metabolism, histidine metabolism, pantothenate and CoA biosynthesis, phenylalanine tyrosine and tryptophan biosynthesis, citrate cycle and glycerophospholipid metabolism, and the protective mechanism of Danshen in AD cell model may be related to partially regulating the perturbed pathways. CONCLUSIONS These outcomes provide valuable evidences for therapeutic mechanism investigation of Danshen in AD treatment, and such an approach could be transferred to unravel the mechanism of other traditional Chinese medicine (TCM) and diseases.
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Affiliation(s)
- Mingyong Zhang
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai, 200433, China
| | - Yue Liu
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai, 200433, China
| | - Min Liu
- Department of Pharmacy, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China
| | - Biying Liu
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
| | - Na Li
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
| | - Xin Dong
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
| | - Zhanying Hong
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China.
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Shanghai, 200433, China.
| | - Yifeng Chai
- School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai, 200433, China
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5
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Sundaram JR, Poore CP, Sulaimee NHB, Pareek T, Cheong WF, Wenk MR, Pant HC, Frautschy SA, Low CM, Kesavapany S. Curcumin Ameliorates Neuroinflammation, Neurodegeneration, and Memory Deficits in p25 Transgenic Mouse Model that Bears Hallmarks of Alzheimer's Disease. J Alzheimers Dis 2018; 60:1429-1442. [PMID: 29036814 DOI: 10.3233/jad-170093] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Several studies have indicated that neuroinflammation is indeed associated with neurodegenerative disease pathology. However, failures of recent clinical trials of anti-inflammatory agents in neurodegenerative disorders have emphasized the need to better understand the complexity of the neuroinflammatory process in order to unravel its link with neurodegeneration. Deregulation of Cyclin-dependent kinase 5 (Cdk5) activity by production of its hyperactivator p25 is involved in the formation of tau and amyloid pathology reminiscent of Alzheimer's disease (AD). Recent studies show an association between p25/Cdk5 hyperactivation and robust neuroinflammation. In addition, we recently reported the novel link between the p25/Cdk5 hyperactivation-induced inflammatory responses and neurodegenerative changes using a transgenic mouse that overexpresses p25 (p25Tg). In this study, we aimed to understand the effects of early intervention with a potent natural anti-inflammatory agent, curcumin, on p25-mediated neuroinflammation and the progression of neurodegeneration in p25Tg mice. The results from this study showed that curcumin effectively counteracted the p25-mediated glial activation and pro-inflammatory chemokines/cytokines production in p25Tg mice. Moreover, this curcumin-mediated suppression of neuroinflammation reduced the progression of p25-induced tau/amyloid pathology and in turn ameliorated the p25-induced cognitive impairments. It is widely acknowledged that to treat AD, one must target the early-stage of pathological changes to protect neurons from irreversible damage. In line with this, our results demonstrated that early intervention of inflammation could reduce the progression of AD-like pathological outcomes. Moreover, our data provide a rationale for the potential use of curcuminoids in the treatment of inflammation associated neurodegenerative diseases.
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Affiliation(s)
- Jeyapriya Raja Sundaram
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Charlene Priscilla Poore
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Noor Hazim Bin Sulaimee
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Tej Pareek
- Department of Pediatrics, Case Western Reserve University, Cleveland, OH, USA
| | - Wei Fun Cheong
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Markus R Wenk
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Harish C Pant
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Sally A Frautschy
- Department of Neurology, University of California, Los Angeles, CA, USA.,Geriatric Research Education and Clinical Center, Veterans Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Chian-Ming Low
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Anaesthesia, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Sashi Kesavapany
- Neurobiology and Ageing Program, Centre for Life Sciences, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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6
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Yan D, Yao J, Liu Y, Zhang X, Wang Y, Chen X, Liu L, Shi N, Yan H. Tau hyperphosphorylation and P-CREB reduction are involved in acrylamide-induced spatial memory impairment: Suppression by curcumin. Brain Behav Immun 2018; 71:66-80. [PMID: 29704550 DOI: 10.1016/j.bbi.2018.04.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/16/2018] [Accepted: 04/25/2018] [Indexed: 01/24/2023] Open
Abstract
Acrylamide (ACR) is an axonal toxicant that produces peripheral neuropathy in laboratory animals and humans. Epidemiological study found that diet ACR exposure was associated with a mild cognitive decline in men. However, limited information is available as regards its potential and underlying mechanism to cause memory alterations. Curcumin is a polyphenol with neuroprotective and cognitive-enhancing properties. In this study, we aimed to investigate the mechanism of ACR-induced spatial memory impairment and the beneficial effect of curcumin. ACR exposure at 10 mg/kg/d for 7 weeks caused slight gait abnormality and spatial memory deficits, which was associated with an activation of glial cells, a reduction of phosphorylated cAMP response elements binding protein (P-CREB) and an aggregation of hyperphosphorylated tau including p-tau (Ser262), AT8 (p-tau Ser202/Thr205) and PHF1 (p-tau Ser396/404) in the hippocampus and cortex. ACR markedly regulate the expression of glycogen synthase kinase-3β (GSK-3β) and cyclin-dependent kinase-5 (cdk5) to accelerate tau hyperphosphorylation. ACR inhibited the protein phosphatase 2A (PP2A) and lysosomal protease cathepsin D to decrease the p-tau dephosphorylation and degradation. The P-CREB and brain derived neurotrophic factor (BDNF) were significantly decreased by ACR. The upstream signalings of P-CREB, extracellular signal-related kinase (ERK) and Akt were markedly inhibited. The protein kinase RNA-like endoplasmic reticulum kinase (PERK) -eukaryotic initiation factor-2α (eIF2α) - activating transcription factor 4 (ATF4) signaling which negatively regulate memory processes by suppressing CREB was activated by ACR. Curcumin alleviated ACR-induced spatial memory impairment through reversing tau abnormalities and P-CREB reduction in the hippocampus. These results offered deeper insight into the mechanisms of and presented a potential new treatment for ACR-induced neurotoxicity.
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Affiliation(s)
- Dandan Yan
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Jianling Yao
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Ying Liu
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Xing Zhang
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Yiqi Wang
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Xiaoyi Chen
- School of Public Health, Guangzhou Medical University, Xinzao, Panyu District, Guangzhou 511436, PR China
| | - Liegang Liu
- Department of Nutrition and Food Hygiene, MOE Key Lab of Environment and Health, Hubei Key Laboratory of Food Nutrition and Safety, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Nian Shi
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China
| | - Hong Yan
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong-Road, Wuhan 430030, PR China.
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7
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Cai Z, Liu Q. Cell Cycle Regulation in Treatment of Breast Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1026:251-270. [PMID: 29282688 DOI: 10.1007/978-981-10-6020-5_12] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cell cycle progression and cell proliferation are under precise and orchestrated control in normal cells. However, uncontrolled cell proliferation caused by aberrant cell cycle progression is a crucial characteristic of cancer. Understanding cell cycle progression and its regulation sheds light on cancer treatment. Agents targeting cell cycle regulators (such as CDKs) have been considered as promising candidates in cancer treatment. Although the first-generation pan-CDK inhibitors failed in clinical trials because of their adverse events and low efficacy, new selective CDK 4/6 inhibitors showed potent efficacy with tolerable safety in preclinical and clinical studies. Here we will review the mechanisms of cell cycle regulation and targeting key cell cycle regulators (such as CDKs) in breast cancer treatment. Particularly, we will discuss the mechanism of CDK inhibitors in disrupting cell cycle progression, the use of selective CDK4/6 inhibitors in treatment of advanced, hormone receptor (HR)-positive postmenopausal breast cancer patients, and other clinical trials that aim to extend the utilization of these agents.
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Affiliation(s)
- Zijie Cai
- Breast Tumor Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, Guangdong, China
| | - Qiang Liu
- Breast Tumor Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou, 510120, Guangdong, China.
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8
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Shukla V, Seo J, Binukumar B, Amin ND, Reddy P, Grant P, Kuntz S, Kesavapany S, Steiner J, Mishra SK, Tsai LH, Pant HC. TFP5, a Peptide Inhibitor of Aberrant and Hyperactive Cdk5/p25, Attenuates Pathological Phenotypes and Restores Synaptic Function in CK-p25Tg Mice. J Alzheimers Dis 2017; 56:335-349. [PMID: 28085018 PMCID: PMC10020940 DOI: 10.3233/jad-160916] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
It has been reported that cyclin-dependent kinase 5 (cdk5), a critical neuronal kinase, is hyperactivated in Alzheimer's disease (AD) and may be, in part, responsible for the hallmark pathology of amyloid plaques and neurofibrillary tangles (NFTs). It has been proposed by several laboratories that hyperactive cdk5 results from the overexpression of p25 (a truncated fragment of p35, the normal cdk5 regulator), which, when complexed to cdk5, induces hyperactivity, hyperphosphorylated tau/NFTs, amyloid-β plaques, and neuronal death. It has previously been shown that intraperitoneal (i.p.) injections of a modified truncated 24-aa peptide (TFP5), derived from the cdk5 activator p35, penetrated the blood-brain barrier and significantly rescued AD-like pathology in 5XFAD model mice. The principal pathology in the 5XFAD mutant, however, is extensive amyloid plaques; hence, as a proof of concept, we believe it is essential to demonstrate the peptide's efficacy in a mouse model expressing high levels of p25, such as the inducible CK-p25Tg model mouse that overexpresses p25 in CamKII positive neurons. Using a modified TFP5 treatment, here we show that peptide i.p. injections in these mice decrease cdk5 hyperactivity, tau, neurofilament-M/H hyperphosphorylation, and restore synaptic function and behavior (i.e., spatial working memory, motor deficit using Rota-rod). It is noteworthy that TFP5 does not inhibit endogenous cdk5/p35 activity, nor other cdks in vivo suggesting it might have no toxic side effects, and may serve as an excellent therapeutic candidate for neurodegenerative disorders expressing abnormally high brain levels of p25 and hyperactive cdk5.
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Affiliation(s)
- Varsha Shukla
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Jinsoo Seo
- Department of Brain and Cognitive Sciences, The Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - B.K. Binukumar
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Niranjana D. Amin
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Preethi Reddy
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Philip Grant
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Susan Kuntz
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | | | - Joseph Steiner
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Santosh K. Mishra
- National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MA, USA
| | - Li-Huei Tsai
- Department of Brain and Cognitive Sciences, The Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Harish C. Pant
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
- Correspondence to: Dr. Harish C. Pant, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
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9
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Binukumar B, Pelech SL, Sutter C, Shukla V, Amin ND, Grant P, Bhaskar M, Skuntz S, Steiner J, Pant HC. Profiling of p5, a 24 Amino Acid Inhibitory Peptide Derived from the CDK5 Activator, p35 CDKR1 Against 70 Protein Kinases. J Alzheimers Dis 2016; 54:525-33. [DOI: 10.3233/jad-160458] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- B.K. Binukumar
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Steven L. Pelech
- Kinexus Bioinformatics Corporation; Division of Neurology, Department of Medicine, University of British Columbia, BC, Canada
| | - Catherine Sutter
- Kinexus Bioinformatics Corporation; Division of Neurology, Department of Medicine, University of British Columbia, BC, Canada
| | - Varsha Shukla
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Niranjana D. Amin
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Philip Grant
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Manju Bhaskar
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Suzanne Skuntz
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Joseph Steiner
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
| | - Harish C. Pant
- National Institute of Neurological Disorders and Strokes, National Institutes of Health, Bethesda, MD, USA
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10
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Saturno G, Pesenti M, Cavazzoli C, Rossi A, Giusti AM, Gierke B, Pawlak M, Venturi M. Expression of Serine/Threonine Protein-Kinases and Related Factors in Normal Monkey and Human Retinas: The Mechanistic Understanding of a CDK2 Inhibitor Induced Retinal Toxicity. Toxicol Pathol 2016; 35:972-83. [DOI: 10.1080/01926230701748271] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Protein-kinase inhibitors are among the most advanced compounds in development using the new drug discovery paradigm of developing small-molecule drugs against specific molecular targets in cancer. After treatment with a cyclin dependent kinase CDK2 inhibitor in monkey, histopathological analysis of the eye showed specific cellular damage in the photoreceptor layer. Since this CDK2 inhibitor showed activity also on other CDKs, in order to investigate the mechanism of toxicity of this compound, we isolated cones and rods from the retina of normal monkey and humans by Laser Capture Microdissection. Using Real-Time PCR we first measured the expression of cyclin dependent protein-kinases (CDK)1, 2, 4, 5, Glycogen synthase kinase 3β (GSK3β) and microtubule associated protein TAU. We additionally verified the presence of these proteins in monkey eye sections by immunohistochemistry and immunofluorescence analysis and afterwards quantified GSK3β , phospho-GSK3β and TAU by Reverse Phase Protein Microarrays. With this work we demonstrate how complementary gene expression and protein-based technologies constitute a powerful tool for the understanding of the molecular mechanism of a CDK2 inhibitor induced toxicity. Moreover, this investigative approach is helpful to better understand and characterize the mechanism of species-specific toxicities and further support a rational, molecular mechanism-based safety assessment in humans.
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Affiliation(s)
- Grazia Saturno
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
| | - Manuela Pesenti
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
| | - Cristiano Cavazzoli
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
| | - Anna Rossi
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
| | - Anna M. Giusti
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
| | - Berthold Gierke
- Natural and Medical Sciences Institute (NMI), at the University of Tuebingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany
| | - Michael Pawlak
- Natural and Medical Sciences Institute (NMI), at the University of Tuebingen, Markwiesenstrasse 55, 72770 Reutlingen, Germany
| | - Miro Venturi
- Nerviano Medical Sciences (NMS), Accelera, v.le Pasteur 10, 20014 Nerviano MI, Italy
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11
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Kurakin A, Bredesen DE. Dynamic self-guiding analysis of Alzheimer's disease. Oncotarget 2016; 6:14092-122. [PMID: 26041885 PMCID: PMC4546454 DOI: 10.18632/oncotarget.4221] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 04/08/2015] [Indexed: 01/25/2023] Open
Abstract
We applied a self-guiding evolutionary algorithm to initiate the synthesis of the Alzheimer's disease-related data and literature. A protein interaction network associated with amyloid-beta precursor protein (APP) and a seed model that treats Alzheimer's disease as progressive dysregulation of APP-associated signaling were used as dynamic “guides” and structural “filters” in the recursive search, analysis, and assimilation of data to drive the evolution of the seed model in size, detail, and complexity. Analysis of data and literature across sub-disciplines and system-scale discovery platforms suggests a key role of dynamic cytoskeletal connectivity in the stability, plasticity, and performance of multicellular networks and architectures. Chronic impairment and/or dysregulation of cell adhesions/synapses, cytoskeletal networks, and/or reversible epithelial-to-mesenchymal-like transitions, which enable and mediate the stable and coherent yet dynamic and reconfigurable multicellular architectures, may lead to the emergence and persistence of the disordered, wound-like pockets/microenvironments of chronically disconnected cells. Such wound-like microenvironments support and are supported by pro-inflammatory, pro-secretion, de-differentiated cellular phenotypes with altered metabolism and signaling. The co-evolution of wound-like microenvironments and their inhabitants may lead to the selection and stabilization of degenerated cellular phenotypes, via acquisition of epigenetic modifications and mutations, which eventually result in degenerative disorders such as cancer and Alzheimer's disease.
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Affiliation(s)
- Alexei Kurakin
- Mary S. Easton Center for Alzheimer's Disease Research, Department of Neurology, University of California, Los Angeles, CA, USA
| | - Dale E Bredesen
- Mary S. Easton Center for Alzheimer's Disease Research, Department of Neurology, University of California, Los Angeles, CA, USA.,Buck Institute for Research on Aging, Novato, CA, USA
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12
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Liu J, Du J, Yang Y, Wang Y. Phosphorylation of TRPV1 by cyclin-dependent kinase 5 promotes TRPV1 surface localization, leading to inflammatory thermal hyperalgesia. Exp Neurol 2015; 273:253-62. [DOI: 10.1016/j.expneurol.2015.09.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 09/02/2015] [Accepted: 09/10/2015] [Indexed: 12/14/2022]
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13
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Acute and chronic stress differentially regulate cyclin-dependent kinase 5 in mouse brain: implications to glucocorticoid actions and major depression. Transl Psychiatry 2015; 5:e578. [PMID: 26057048 PMCID: PMC4490283 DOI: 10.1038/tp.2015.72] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 04/23/2015] [Indexed: 12/19/2022] Open
Abstract
Stress activates the hypothalamic-pituitary-adrenal axis, which in turn increases circulating glucocorticoid concentrations and stimulates the glucocorticoid receptor (GR). Chronically elevated glucocorticoids by repetitive exposure to stress are implicated in major depression and anxiety disorders. Cyclin-dependent kinase 5 (CDK5), a molecule essential for nervous system development, function and pathogenesis of neurodegenerative disorders, can modulate GR activity through phosphorylation. We examined potential contribution of CDK5 to stress response and pathophysiology of major depression. In mice, acute immobilized stress (AS) caused a biphasic effect on CDK5 activity, initially reducing but increasing afterwards in prefrontal cortex (PFC) and hippocampus (HIPPO), whereas chronic unpredictable stress (CS) strongly increased it in these brain areas, indicating that AS and CS differentially regulate this kinase activity in a brain region-specific fashion. GR phosphorylation contemporaneously followed the observed changes of CDK5 activity after AS, thus CDK5 may in part alter GR phosphorylation upon this stress. In the postmortem brains of subjects with major depression, CDK5 activity was elevated in Brodmann's area 25, but not in entire PFC and HIPPO. Messenger RNA expression of glucocorticoid-regulated/stress-related genes showed distinct expression profiles in several brain areas of these stressed mice or depressive subjects in which CDK5-mediated changes in GR phosphorylation may have some regulatory roles. Taken together, these results indicate that CDK5 is an integral component of stress response and major depression with regulatory means specific to different stressors, brain areas and diseases in part through changing phosphorylation of GR.
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14
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Li MH, Arndt K, Das S, Weiss EM, Wu Y, Gwal K, Shekdar KV, Zackai EH. Compound heterozygoteCDK5RAP2mutations in a Guatemalan/Honduran child with autosomal recessive primary microcephaly, failure to thrive and speech delay. Am J Med Genet A 2015; 167:1414-7. [DOI: 10.1002/ajmg.a.36975] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 12/11/2014] [Indexed: 01/23/2023]
Affiliation(s)
- Mindy H Li
- Division of Human Genetics; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Pediatrics; University of Pennsylvania Perelman School of Medicine; Philadelphia Pennsylvania
| | - Kelly Arndt
- Department of Human Genetics; The University of Chicago; Chicago Illinois
| | - Soma Das
- Department of Human Genetics; The University of Chicago; Chicago Illinois
| | - Elliott M Weiss
- Department of Pediatrics; University of Pennsylvania Perelman School of Medicine; Philadelphia Pennsylvania
- Division of Neonatology; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Medical Ethics and Health Policy; University of Pennsylvania; Philadelphia Pennsylvania
| | - Yaning Wu
- Division of Human Genetics; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Kriti Gwal
- Department of Radiology; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Karuna V Shekdar
- Department of Radiology; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Elaine H Zackai
- Division of Human Genetics; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Pediatrics; University of Pennsylvania Perelman School of Medicine; Philadelphia Pennsylvania
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15
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Li S, Zhang Y, Zhu F, Zhang B, Lin J, Xu C, Yang W, Hao W, Zhang R. A new treatment for cognitive disorders related to in utero exposure to alcohol. Neural Regen Res 2014; 8:1702-13. [PMID: 25206467 PMCID: PMC4145914 DOI: 10.3969/j.issn.1673-5374.2013.18.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Accepted: 04/23/2013] [Indexed: 01/13/2023] Open
Abstract
Maternal alcohol consumption during pregnancy has detrimental effects on fetal central nervous system development. Maternal alcohol consumption prior to and during pregnancy significantly affects cognitive functions in offspring, which may be related to changes in cyclin-dependent kinase 5 because it is associated with modulation of synaptic plasticity and impaired learning and memory. In this study, we examined adult offspring in a maternal alcohol consumption model in rats. Y-maze test results showed that in utero exposure to alcohol impairs learning and memory capacities. Cyclin-dependent kinase 5 mRNA and protein expressions in the hippocampus of the offspring were significantly elevated, as assayed by quantitative real-time PCR and reverse transcription-PCR, immunofluorescence, and immuno-precipitation. Our experimental findings strongly suggest that altered cyclin-dependent kinase 5 may mediate impaired learning and memory in adult rats that were exposed to alcohol by maternal consumption while in utero.
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Affiliation(s)
- Shuang Li
- Second Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China ; Department of Physiology, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Yan Zhang
- Second Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China ; Department of Physiology, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Feng Zhu
- First Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Bin Zhang
- First Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Jianying Lin
- First Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Chunyang Xu
- Department of Immunology, Xinxiang Medical University, Xinxiang 453003, Henan Province, China ; Henan Key Laboratory of Biological Psychiatry, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Wancai Yang
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Wei Hao
- Second Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China ; Henan Key Laboratory of Biological Psychiatry, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
| | - Ruiling Zhang
- Second Affiliated Hospital, Xinxiang Medical University, Xinxiang 453003, Henan Province, China ; Henan Key Laboratory of Biological Psychiatry, Xinxiang Medical University, Xinxiang 453003, Henan Province, China
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16
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Lu J, Miao J, Su T, Liu Y, He R. Formaldehyde induces hyperphosphorylation and polymerization of Tau protein both in vitro and in vivo. Biochim Biophys Acta Gen Subj 2013; 1830:4102-16. [DOI: 10.1016/j.bbagen.2013.04.028] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 04/07/2013] [Accepted: 04/18/2013] [Indexed: 12/29/2022]
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Nagano T, Hashimoto T, Nakashima A, Hisanaga SI, Kikkawa U, Kamada S. Cyclin I is involved in the regulation of cell cycle progression. Cell Cycle 2013; 12:2617-24. [PMID: 23907122 DOI: 10.4161/cc.25623] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Cyclins control cell cycle progression by regulating the activity of cyclin-dependent kinases (Cdks). Cyclin I is a member of the cyclin family because of the presence of a cyclin box motif. It has been suggested that Cyclin I is involved in various biological processes, such as cell survival, angiogenesis, and cell differentiation. However, whether or not Cyclin I has a role in regulating the cell cycle similarly to other cyclins has yet to be clarified. Therefore, we investigated the role for Cyclin I in cell cycle progression. We showed that the protein level of Cyclin I oscillated during the cell cycle, and that Cyclin I was subjected to ubiquitination and degradation in cells. The interaction between Cyclin I and Cdk5 was detected in cells overexpressed with both proteins. Furthermore, depletion of Cyclin I by siRNAs prevented cell proliferation, suggesting the positive role of Cyclin I for the cell cycle progression. In addition, flow cytometric analysis revealed that cells depleted of Cyclin I were accumulated at G₂/M phases. By using HeLa.S-Fucci (fluorescent ubiquitination-based cell cycle indicator) cells, we further confirmed that knockdown of Cyclin I induced cell cycle arrest at S/G₂/M phases. These results strongly suggest that Cyclin I has the role in the regulation of cell cycle progression.
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Affiliation(s)
- Taiki Nagano
- Biosignal Research Center, Kobe University, Kobe, Japan
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18
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Binukumar BK, Shukla V, Amin ND, Reddy P, Skuntz S, Grant P, Pant HC. Topographic regulation of neuronal intermediate filaments by phosphorylation, role of peptidyl-prolyl isomerase 1: significance in neurodegeneration. Histochem Cell Biol 2013; 140:23-32. [PMID: 23793952 DOI: 10.1007/s00418-013-1108-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2013] [Indexed: 11/30/2022]
Abstract
The neuronal cytoskeleton is tightly regulated by phosphorylation and dephosphorylation reactions mediated by numerous associated kinases, phosphatases and their regulators. Defects in the relative kinase and phosphatase activities and/or deregulation of compartment-specific phosphorylation result in neurodegenerative disorders. The largest family of cytoskeletal proteins in mammalian cells is the superfamily of intermediate filaments (IFs). The neurofilament (NF) proteins are the major IFs. Aggregated forms of hyperphosphorylated tau and phosphorylated NFs are found in pathological cell body accumulations in the central nervous system of patients suffering from Alzheimer's disease, Parkinson's disease, and Amyotrophic Lateral Sclerosis. The precise mechanisms for this compartment-specific phosphorylation of cytoskeletal proteins are not completely understood. In this review, we focus on the mechanisms of neurofilament phosphorylation in normal physiology and neurodegenerative diseases. We also address the recent breakthroughs in our understanding the role of different kinases and phosphatases involved in regulating the phosphorylation status of the NFs. In addition, special emphasis has been given to describe the role of phosphatases and Pin1 in phosphorylation of NFs.
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Affiliation(s)
- B K Binukumar
- Laboratory of Neuronal Cytoskeletal Protein Regulation Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
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19
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Im SK, Yeo M, Lee KJ. Proteomic identification of proteins suggestive of immune-mediated response or neuronal degeneration in serum of achalasia patients. Gut Liver 2013; 7:411-6. [PMID: 23898380 PMCID: PMC3724028 DOI: 10.5009/gnl.2013.7.4.411] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 10/19/2012] [Accepted: 10/26/2012] [Indexed: 12/18/2022] Open
Abstract
Background/Aims The primary pathophysiologic abnormality in achalasia is known to be a loss of inhibitory myenteric ganglion cells, which may result from an immune-mediated response or neuronal degeneration. The aim of this study was to identify proteins suggestive of an immune-mediated response or neuronal degeneration in the serum of achalasia patients using a proteomic analysis. Methods Blood samples were collected from five symptomatic achalasia patients and five sex- and age-matched healthy controls. Serum proteomic analysis was conducted, and the protein spots were identified using matrix-assisted laser desorption ionization/time-of-flight and a proteomics analyzer. The serum level of C3 was measured by enzyme-linked immunosorbent assay in nine patients with achalasia and 18 sex- and age-matched healthy controls. Results Of the 658 matched protein spots, 28 spots were up-regulated over 2-fold in the serum from achalasia patients compared with that from controls. The up-regulated proteins included complement C4B5, complement C3, cyclin-dependent kinase 5, transthyretin, and alpha 2 macroglobulin. The serum levels of C3 in achalasia patients were significantly higher than those of controls. Conclusions The serum proteomic analysis of achalasia patients suggests an immune-mediated response or neuronal degeneration. Further validation studies in larger samples and the esophageal tissue of achalasia patients are required.
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Affiliation(s)
- Seon Kyo Im
- Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea
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20
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Specific inhibition of p25/Cdk5 activity by the Cdk5 inhibitory peptide reduces neurodegeneration in vivo. J Neurosci 2013; 33:334-43. [PMID: 23283346 DOI: 10.1523/jneurosci.3593-12.2013] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The aberrant hyperactivation of Cyclin-dependent kinase 5 (Cdk5), by the production of its truncated activator p25, results in the formation of hyperphosphorylated tau, neuroinflammation, amyloid deposition, and neuronal death in vitro and in vivo. Mechanistically, this occurs as a result of a neurotoxic insult that invokes the intracellular elevation of calcium to activate calpain, which cleaves the Cdk5 activator p35 into p25. It has been shown previously that the p25 transgenic mouse as a model to investigate the mechanistic implications of p25 production in the brain, which recapitulates deregulated Cdk5-mediated neuropathological changes, such as hyperphosphorylated tau and neuronal death. To date, strategies to inhibit Cdk5 activity have not been successful in targeting selectively aberrant activity without affecting normal Cdk5 activity. Here we show that the selective inhibition of p25/Cdk5 hyperactivation in vivo, through overexpression of the Cdk5 inhibitory peptide (CIP), rescues against the neurodegenerative pathologies caused by p25/Cdk5 hyperactivation without affecting normal neurodevelopment afforded by normal p35/Cdk5 activity. Tau and amyloid pathologies as well as neuroinflammation are significantly reduced in the CIP-p25 tetra transgenic mice, whereas brain atrophy and subsequent cognitive decline are reversed in these mice. The findings reported here represent an important breakthrough in elucidating approaches to selectively inhibit the p25/Cdk5 hyperactivation as a potential therapeutic target to reduce neurodegeneration.
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21
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Cdk5/p25-induced cytosolic PLA2-mediated lysophosphatidylcholine production regulates neuroinflammation and triggers neurodegeneration. J Neurosci 2012; 32:1020-34. [PMID: 22262900 DOI: 10.1523/jneurosci.5177-11.2012] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The deregulation of cyclin-dependent kinase 5 (Cdk5) by p25 has been shown to contribute to the pathogenesis in a number of neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS), Parkinson's disease (PD) and Alzheimer's disease (AD). In particular, p25/Cdk5 has been shown to produce hyperphosphorylated tau, neurofibrillary tangles as well as aberrant amyloid precursor protein processing found in AD. Neuroinflammation has been observed alongside the pathogenic process in these neurodegenerative diseases, however the precise mechanism behind the induction of neuroinflammation and the significance in the AD pathogenesis has not been fully elucidated. In this report, we uncover a novel pathway for p25-induced neuroinflammation where p25 expression induces an early trigger of neuroinflammation in vivo in mice. Lipidomic mass spectrometry, in vitro coculture and conditioned media transfer experiments show that the soluble lipid mediator lysophosphatidylcholine (LPC) is released by p25 overexpressing neurons to initiate astrogliosis, neuroinflammation and subsequent neurodegeneration. Reverse transcriptase PCR and gene silencing experiments show that cytosolic phospholipase 2 (cPLA2) is the key enzyme mediating the p25-induced LPC production and cPLA2 upregulation is critical in triggering the p25-mediated inflammatory and neurodegenerative process. Together, our findings delineate a potential therapeutic target for the reduction of neuroinflammation in neurodegenerative diseases including AD.
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22
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Keeney JTR, Swomley AM, Harris JL, Fiorini A, Mitov MI, Perluigi M, Sultana R, Butterfield DA. Cell cycle proteins in brain in mild cognitive impairment: insights into progression to Alzheimer disease. Neurotox Res 2011; 22:220-30. [PMID: 22083458 DOI: 10.1007/s12640-011-9287-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 10/20/2011] [Accepted: 10/20/2011] [Indexed: 01/24/2023]
Abstract
Recent studies have demonstrated the re-emergence of cell cycle proteins in brain as patients progress from the early stages of mild cognitive impairment (MCI) into Alzheimer's disease (AD). Oxidative stress markers present in AD have also been shown to be present in MCI brain suggesting that these events occur in early stages of the disease. The levels of key cell cycle proteins, such as CDK2, CDK5, cyclin G1, and BRAC1 have all been found to be elevated in MCI brain compared to age-matched control. Further, peptidyl prolyl cis-trans isomerase (Pin1), a protein that plays an important role in regulating the activity of key proteins, such as CDK5, GSK3-β, and PP2A that are involved in both the phosphorylation state of Tau and in the cell cycle, has been found to be oxidatively modified and downregulated in both AD and MCI brain. Hyperphosphorylation of Tau then results in synapse loss and the characteristic Tau aggregation as neurofibrillary tangles, an AD hallmark. In this review, we summarized the role of cell cycle dysregulation in the progression of disease from MCI to AD. Based on the current literature, it is tempting to speculate that a combination of oxidative stress and cell cycle dysfunction conceivably leads to neurodegeneration.
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Affiliation(s)
- Jeriel T R Keeney
- Department of Chemistry, Center for Membrane Sciences, Sanders Brown Center on Aging, University of Kentucky, Lexington, KY 40506, USA
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23
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Simpkins JW, Perez E, Wang X, Yang S, Wen Y, Singh M. The potential for estrogens in preventing Alzheimer's disease and vascular dementia. Ther Adv Neurol Disord 2011; 2:31-49. [PMID: 19890493 DOI: 10.1177/1756285608100427] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Estrogens are the best-studied class of drugs for potential use in the prevention of Alzheimer's disease (AD). These steroids have been shown to be potent neuroprotectants both in vitro and in vivo, and to exert effects that are consistent with their potential use in prevention of AD. These include the prevention of the processing of amyloid precursor protein (APP) into beta-amyloid (Aß), the reduction in tau hyperphosphorylation, and the elimination of catastrophic attempts at neuronal mitosis. Further, epidemiological data support the efficacy of early postmenopausal use of estrogens for the delay or prevention of AD. Collectively, this evidence supports the further development of estrogen-like compounds for prevention of AD. Several approaches to enhance brain specificity of estrogen action are now underway in an attempt to reduce the side effects of chronic estrogen therapy in AD.
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Affiliation(s)
- James W Simpkins
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, Center FOR HER (Focused On Resources for her Health, Education and Research), University of North Texas Health Science Center, Fort Worth, TX, USA
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24
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Hisanaga SI, Endo R. Regulation and role of cyclin-dependent kinase activity in neuronal survival and death. J Neurochem 2010; 115:1309-21. [PMID: 21044075 DOI: 10.1111/j.1471-4159.2010.07050.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cyclin-dependent kinase (Cdk)5 is a proline-directed Ser/Thr protein kinase that functions mainly in neurons and is activated by binding to a regulatory subunit, p35 or p39. Kinase activity is mainly determined by the amount of p35 available, which is controlled by a balance between synthesis and degradation. Kinase activity is also regulated by Cdk5 phosphorylation, but the activity of phosphorylated Cdk5 is in contrast to that of cycling Cdks. Cdk5 is a versatile protein kinase that regulates multiple neuronal activities including neuronal migration and synaptic signaling. Further, Cdk5 plays a role in both survival and death of neurons. Long-term inactivation of Cdk5 triggers cell death, and the survival activity of Cdk5 is apparent when neurons suffer from stress. In contrast, hyper-activation of Cdk5 by p25 promotes cell death, probably by reactivating cell-cycle machinery in the nucleus. The pro-death activity is suppressed by membrane association of Cdk5 via myristoylation of p35. Appropriate activity, localization, and regulation of Cdk5 may be critical for long-term survival of neurons, which is more than 80 years in the case of humans.
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Affiliation(s)
- Shin-ichi Hisanaga
- Molecular Neuroscience, Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo, Japan.
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25
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Schneider A, Falkai P, Papassotiropoulos A. [Molecular principles of tau-induced toxicity: new experimental therapy strategies for treatment of Alzheimer's disease]. DER NERVENARZT 2010; 81:1289-90, 1292, 1294, passim. [PMID: 20842339 DOI: 10.1007/s00115-010-3052-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Neurofibrillary tangles are the hallmark of Alzheimer's disease together with amyloid plaques. They are composed of hyperphosphorylated and aggregated Tau proteins. Consequently, experimental disease modifying approaches include kinase and aggregation inhibitors as well as substances which increase degradation of Tau proteins.
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Affiliation(s)
- A Schneider
- Klinik für Psychiatrie und Psychotherapie, Gedächtnisambulanz, Universitätsmedizin Göttingen, Göttingen, Deutschland.
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26
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Zheng YL, Li BS, Rudrabhatla P, Shukla V, Amin ND, Maric D, Kesavapany S, Kanungo J, Pareek TK, Takahashi S, Grant P, Kulkarni AB, Pant HC. Phosphorylation of p27Kip1 at Thr187 by cyclin-dependent kinase 5 modulates neural stem cell differentiation. Mol Biol Cell 2010; 21:3601-14. [PMID: 20810788 PMCID: PMC2954124 DOI: 10.1091/mbc.e10-01-0054] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Cdk5 plays a role in nervous system development; its role in the initial stages of neural differentiation is poorly understood. We isolated neural stem cells from E13 Cdk5 WT and KO mouse and observed them as they switched from proliferating stage to neural differentiation. We show that Cdk5 phosphorylation of p27kip1 at Thr187 is crucial to neural differentiation. Cyclin-dependent kinase 5 (Cdk5) plays a key role in the development of the mammalian nervous system; it phosphorylates a number of targeted proteins involved in neuronal migration during development to synaptic activity in the mature nervous system. Its role in the initial stages of neuronal commitment and differentiation of neural stem cells (NSCs), however, is poorly understood. In this study, we show that Cdk5 phosphorylation of p27Kip1 at Thr187 is crucial to neural differentiation because 1) neurogenesis is specifically suppressed by transfection of p27Kip1 siRNA into Cdk5+/+ NSCs; 2) reduced neuronal differentiation in Cdk5−/− compared with Cdk5+/+ NSCs; 3) Cdk5+/+ NSCs, whose differentiation is inhibited by a nonphosphorylatable mutant, p27/Thr187A, are rescued by cotransfection of a phosphorylation-mimicking mutant, p27/Thr187D; and 4) transfection of mutant p27Kip1 (p27/187A) into Cdk5+/+ NSCs inhibits differentiation. These data suggest that Cdk5 regulates the neural differentiation of NSCs by phosphorylation of p27Kip1 at theThr187 site. Additional experiments exploring the role of Ser10 phosphorylation by Cdk5 suggest that together with Thr187 phosphorylation, Ser10 phosphorylation by Cdk5 promotes neurite outgrowth as neurons differentiate. Cdk5 phosphorylation of p27Kip1, a modular molecule, may regulate the progress of neuronal differentiation from cell cycle arrest through differentiation, neurite outgrowth, and migration.
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Affiliation(s)
- Ya-Li Zheng
- Laboratory of Neurochemistry, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892-4130, USA
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27
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Zheng YL, Amin ND, Hu YF, Rudrabhatla P, Shukla V, Kanungo J, Kesavapany S, Grant P, Albers W, Pant HC. A 24-residue peptide (p5), derived from p35, the Cdk5 neuronal activator, specifically inhibits Cdk5-p25 hyperactivity and tau hyperphosphorylation. J Biol Chem 2010; 285:34202-12. [PMID: 20720012 DOI: 10.1074/jbc.m110.134643] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The activity of Cdk5-p35 is tightly regulated in the developing and mature nervous system. Stress-induced cleavage of the activator p35 to p25 and a p10 N-terminal domain induces deregulated Cdk5 hyperactivity and perikaryal aggregations of hyperphosphorylated Tau and neurofilaments, pathogenic hallmarks in neurodegenerative diseases, such as Alzheimer disease and amyotrophic lateral sclerosis, respectively. Previously, we identified a 125-residue truncated fragment of p35 called CIP that effectively and specifically inhibited Cdk5-p25 activity and Tau hyperphosphorylation induced by Aβ peptides in vitro, in HEK293 cells, and in neuronal cells. Although these results offer a possible therapeutic approach to those neurodegenerative diseases assumed to derive from Cdk5-p25 hyperactivity and/or Aβ induced pathology, CIP is too large for successful therapeutic regimens. To identify a smaller, more effective peptide, in this study we prepared a 24-residue peptide, p5, spanning CIP residues Lys(245)-Ala(277). p5 more effectively inhibited Cdk5-p25 activity than did CIP in vitro. In neuron cells, p5 inhibited deregulated Cdk5-p25 activity but had no effect on the activity of endogenous Cdk5-p35 or on any related endogenous cyclin-dependent kinases in HEK293 cells. Specificity of p5 inhibition in cortical neurons may depend on the p10 domain in p35, which is absent in p25. Furthermore, we have demonstrated that p5 reduced Aβ(1-42)-induced Tau hyperphosphorylation and apoptosis in cortical neurons. These results suggest that p5 peptide may be a unique and useful candidate for therapeutic studies of certain neurodegenerative diseases.
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Affiliation(s)
- Ya-Li Zheng
- Laboratory of Neurochemistry, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
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Cell-Penetrating Fragments of the Cdk5 Regulatory Subunit Are Protective in Models of Neurodegeneration. Pharmaceuticals (Basel) 2010; 3:1232-1240. [PMID: 27713298 PMCID: PMC4034031 DOI: 10.3390/ph3041232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 04/16/2010] [Accepted: 04/21/2010] [Indexed: 11/29/2022] Open
Abstract
Cdk5 is essential for neuronal differentiation processes in the brain. Activation of Cdk5 requires the association with the mostly neuron-specific p35 or p39. Overactivation of CDK5 by cleavage of p35 into p25 is thought to be involved in neurodegenerative processes. Here, we have tested an approach to inhibit pathological Cdk5 activation with a Tat-linked dominant-negative fragment of p25. It reduced cell death induced by staurosporine and showed a tendency to alleviate manganese-induced cell death, while it did not protect against 6-OHDA toxicity. Our results suggest that the Tat technique is a suitable tool to inhibit dysregulated CDK5.
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Sarachana T, Zhou R, Chen G, Manji HK, Hu VW. Investigation of post-transcriptional gene regulatory networks associated with autism spectrum disorders by microRNA expression profiling of lymphoblastoid cell lines. Genome Med 2010; 2:23. [PMID: 20374639 PMCID: PMC2873801 DOI: 10.1186/gm144] [Citation(s) in RCA: 166] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Revised: 02/19/2010] [Accepted: 04/07/2010] [Indexed: 12/12/2022] Open
Abstract
Background Autism spectrum disorders (ASD) are neurodevelopmental disorders characterized by abnormalities in reciprocal social interactions and language development and/or usage, and by restricted interests and repetitive behaviors. Differential gene expression of neurologically relevant genes in lymphoblastoid cell lines from monozygotic twins discordant in diagnosis or severity of autism suggested that epigenetic factors such as DNA methylation or microRNAs (miRNAs) may be involved in ASD. Methods Global miRNA expression profiling using lymphoblasts derived from these autistic twins and unaffected sibling controls was therefore performed using high-throughput miRNA microarray analysis. Selected differentially expressed miRNAs were confirmed by quantitative reverse transcription-polymerase chain reaction (qRT-PCR) analysis, and the putative target genes of two of the confirmed miRNA were validated by knockdown and overexpression of the respective miRNAs. Results Differentially expressed miRNAs were found to target genes highly involved in neurological functions and disorders in addition to genes involved in gastrointestinal diseases, circadian rhythm signaling, as well as steroid hormone metabolism and receptor signaling. Novel network analyses of the putative target genes that were inversely expressed relative to the relevant miRNA in these same samples further revealed an association with ASD and other co-morbid disorders, including muscle and gastrointestinal diseases, as well as with biological functions implicated in ASD, such as memory and synaptic plasticity. Putative gene targets (ID3 and PLK2) of two RT-PCR-confirmed brain-specific miRNAs (hsa-miR-29b and hsa-miR-219-5p) were validated by miRNA overexpression or knockdown assays, respectively. Comparisons of these mRNA and miRNA expression levels between discordant twins and between case-control sib pairs show an inverse relationship, further suggesting that ID3 and PLK2 are in vivo targets of the respective miRNA. Interestingly, the up-regulation of miR-23a and down-regulation of miR-106b in this study reflected miRNA changes previously reported in post-mortem autistic cerebellum by Abu-Elneel et al. in 2008. This finding validates these differentially expressed miRNAs in neurological tissue from a different cohort as well as supports the use of the lymphoblasts as a surrogate to study miRNA expression in ASD. Conclusions Findings from this study strongly suggest that dysregulation of miRNA expression contributes to the observed alterations in gene expression and, in turn, may lead to the pathophysiological conditions underlying autism.
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Affiliation(s)
- Tewarit Sarachana
- Department of Biochemistry and Molecular Biology, The George Washington University Medical Center, 2300 Eye St NW, Washington, DC 20037, USA.
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Kino T, Jaffe H, Amin ND, Chakrabarti M, Zheng YL, Chrousos GP, Pant HC. Cyclin-dependent kinase 5 modulates the transcriptional activity of the mineralocorticoid receptor and regulates expression of brain-derived neurotrophic factor. Mol Endocrinol 2010; 24:941-52. [PMID: 20357208 DOI: 10.1210/me.2009-0395] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Glucocorticoids, major end effectors of the stress response, play an essential role in the homeostasis of the central nervous system (CNS) and contribute to memory consolidation and emotional control through their intracellular receptors, the glucocorticoid and mineralocorticoid receptors. Cyclin-dependent kinase 5 (CDK5), on the other hand, plays important roles in the morphogenesis and functions of the central nervous system, and its aberrant activation has been associated with development of neurodegenerative disorders. We previously reported that CDK5 phosphorylated the glucocorticoid receptor and modulated its transcriptional activity. Here we found that CDK5 also regulated mineralocorticoid receptor-induced transcriptional activity by phosphorylating multiple serine and threonine residues located in its N-terminal domain through physical interaction. Aldosterone and dexamethasone, respectively, increased and suppressed mRNA/protein expression of brain-derived neurotrophic factor (BDNF) in rat cortical neuronal cells, whereas the endogenous glucocorticoid corticosterone showed a biphasic effect. CDK5 enhanced the effect of aldosterone and dexamethasone on BDNF expression. Because this neurotrophic factor plays critical roles in neuronal viability, synaptic plasticity, consolidation of memory, and emotional changes, we suggest that aberrant activation of CDK5 might influence these functions through corticosteroid receptors/BDNF.
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Affiliation(s)
- Tomoshige Kino
- Unit on Molecular Hormone Action, Program in Reproductive and Adult Endocrinology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-1109, USA.
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Qi Z, Miller GW, Voit EO. The internal state of medium spiny neurons varies in response to different input signals. BMC SYSTEMS BIOLOGY 2010; 4:26. [PMID: 20236543 PMCID: PMC2848196 DOI: 10.1186/1752-0509-4-26] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Accepted: 03/17/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND Parkinson's disease, schizophrenia, Huntington's chorea and drug addiction are manifestations of malfunctioning neurons within the striatum region at the base of the human forebrain. A key component of these neurons is the protein DARPP-32, which receives and processes various types of dopamine and glutamate inputs and translates them into specific biochemical, cellular, physiological, and behavioral responses. DARPP-32's unique capacity of faithfully converting distinct neurotransmitter signals into appropriate responses is achieved through a complex phosphorylation-dephosphorylation system that evades intuition and predictability. RESULTS To gain deeper insights into the functioning of the DARPP-32 signal transduction system, we developed a dynamic model that is robust and consistent with available clinical, pharmacological, and biological observations. Upon validation, the model was first used to explore how different input signal scenarios are processed by DARPP-32 and translated into distinct static and dynamic responses. Secondly, a comprehensive perturbation analysis identified the specific role of each component on the system's signal transduction ability. CONCLUSIONS Our study investigated the effects of various patterns of neurotransmission on signal integration and interpretation by DARPP-32 and showed that the DARPP-32 system has the capability of discerning surprisingly many neurotransmission scenarios. We also screened out potential mechanisms underlying this capability of the DARPP-32 system. This type of insight deepens our understanding of neuronal signal transduction in normal medium spiny neurons, sheds light on neurological disorders associated with the striatum, and might aid the search for intervention targets in neurological diseases and drug addiction.
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Affiliation(s)
- Zhen Qi
- Department of Biomedical Engineering, Georgia Institute of Technology and Emory University Medical School, Atlanta, GA 30332, USA
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Hosokawa T, Saito T, Asada A, Fukunaga K, Hisanaga SI. Quantitative measurement of in vivo phosphorylation states of Cdk5 activator p35 by Phos-tag SDS-PAGE. Mol Cell Proteomics 2010; 9:1133-43. [PMID: 20097924 DOI: 10.1074/mcp.m900578-mcp200] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Phosphorylation is a major post-translational modification widely used in the regulation of many cellular processes. Cyclin-dependent kinase 5 (Cdk5) is a proline-directed serine/threonine kinase activated by activation subunit p35. Cdk5-p35 regulates various neuronal activities such as neuronal migration, spine formation, synaptic activity, and cell death. The kinase activity of Cdk5 is regulated by proteolysis of p35: proteasomal degradation causes down-regulation of Cdk5, whereas cleavage of p35 by calpain causes overactivation of Cdk5. Phosphorylation of p35 determines the proteolytic pathway. We have previously identified Ser(8) and Thr(138) as major phosphorylation sites using metabolic labeling of cultured cells followed by two-dimensional phosphopeptide mapping and phosphospecific antibodies. However, these approaches cannot determine the extent of p35 phosphorylation in vivo. Here we report the use of Phos-tag SDS-PAGE to reveal the phosphorylation states of p35 in neuronal culture and brain. Using Phos-tag acrylamide, the electrophoretic mobility of phosphorylated p35 was delayed because it is trapped at Phos-tag sites. We found a novel phosphorylation site at Ser(91), which was phosphorylated by Ca(2+)-calmodulin-dependent protein kinase II in vitro. We constructed phosphorylation-dependent banding profiles of p35 and Ala substitution mutants at phosphorylation sites co-expressed with Cdk5 in COS-7 cells. Using the standard banding profiles, we assigned respective bands of endogenous p35 with combinations of phosphorylation states and quantified Ser(8), Ser(91), and Thr(138) phosphorylation. The highest level of p35 phosphorylation was observed in embryonic brain; Ser(8) was phosphorylated in all p35 molecules, whereas Ser(91) was phosphorylated in 60% and Thr(138) was phosphorylated in approximately 12% of p35 molecules. These are the first quantitative and site-specific measurements of phosphorylation of p35, demonstrating the usefulness of Phos-tag SDS-PAGE for analysis of phosphorylation states of in vivo proteins.
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Affiliation(s)
- Tomohisa Hosokawa
- Department of Biological Sciences, Graduate School of Science and Technology, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
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Simpkins JW, Gatson JW, Wigginton JG. Commentary on "a roadmap for the prevention of dementia II. Leon Thal Symposium 2008." Rationale and recommendations for first evaluating anti-Alzheimer's disease medications in acute brain injury patients. Alzheimers Dement 2009; 5:143-6. [PMID: 19328446 PMCID: PMC5008237 DOI: 10.1016/j.jalz.2009.01.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- James W Simpkins
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX, USA.
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Chambery A, Colucci-D’Amato L, Vissers JPC, Scarpella S, Langridge JI, Parente A. Proteomic Profiling of Proliferating and Differentiated Neural mes-c-myc A1 Cell Line from Mouse Embryonic Mesencephalon by LC−MS. J Proteome Res 2008; 8:227-38. [DOI: 10.1021/pr800454n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Angela Chambery
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
| | - Luca Colucci-D’Amato
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
| | - Johannes P. C. Vissers
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
| | - Simona Scarpella
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
| | - James I. Langridge
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
| | - Augusto Parente
- Dipartimento di Scienze della Vita, Seconda Università di Napoli, I-81100 Caserta, Italy, Istituto di Genetica e Biofisica “A. Buzzati-Traverso”, Consiglio Nazionale delle Ricerche, 80131-Napoli, Italy, and Waters Corporation, MS Technologies Center, M22 5PP Manchester, United Kingdom
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Yang G, Wang L, Zhu M, Xu D. Identification of non-Alzheimer's disease tauopathies-related proteins by proteomic analysis. Neurol Res 2008; 30:613-22. [PMID: 18647502 DOI: 10.1179/174313208x284124] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVES To identify differentially expressed proteins between tauopathies cases and controls and to explore molecular mechanisms of tauopathies. METHOD Two-dimensional gel electrophoresis (2DE) was applied to separate the total proteins of temporal lobe obtained at autopsy from four tauopathies cases and four aged subjects without clinical or pathologic involvement of nervous system. The silver or Coomassie brilliant blue stained gels were analysed by 2-DE software Image Master 2D Elite. Selected differential protein spots were identified with MALDI-TOF/TOF tandem mass spectrometry. RESULTS Glyceraldehyde 3-phosphate dehydrogenase, uracil DNA glycosylase, human superoxide dismutase, isocitrate dehydrogenase subunit, synaptotagmin I, thioredoxin peroxidase 1, glial fibrillary acidic protein, P25 alpha, enoyl coenzyme A hydratase short chain 1, pyridoxine-5'-phosphate oxidase, Mn-superoxide dismutase and alpha enolase were significantly upregulated in tauopathies brains, whereas antioxidant protein 2, ferritin heavy chain, glutamate dehydrogenase precursor, peptidyl-prolyl cis-trans isomerase A, serum albumin precursor and dihydropyrimidinase-related protein 2 were lowly expressed in tauopathies brains. CONCLUSIONS We identified a number of tauopathy-related proteins that might be useful for discovering the molecular mechanisms of tauopathies, which could also be helpful for diagnosing and treating these disorders.
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Affiliation(s)
- Guofeng Yang
- Department of Geriatric Neurology, Chinese PLA General Hospital, Beijing 100853, China
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Liang WS, Dunckley T, Beach TG, Grover A, Mastroeni D, Ramsey K, Caselli RJ, Kukull WA, McKeel D, Morris JC, Hulette CM, Schmechel D, Reiman EM, Rogers J, Stephan DA. Altered neuronal gene expression in brain regions differentially affected by Alzheimer's disease: a reference data set. Physiol Genomics 2008; 33:240-56. [PMID: 18270320 DOI: 10.1152/physiolgenomics.00242.2007] [Citation(s) in RCA: 213] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Alzheimer's Disease (AD) is the most widespread form of dementia during the later stages of life. If improved therapeutics are not developed, the prevalence of AD will drastically increase in the coming years as the world's population ages. By identifying differences in neuronal gene expression profiles between healthy elderly persons and individuals diagnosed with AD, we may be able to better understand the molecular mechanisms that drive AD pathogenesis, including the formation of amyloid plaques and neurofibrillary tangles. In this study, we expression profiled histopathologically normal cortical neurons collected with laser capture microdissection (LCM) from six anatomically and functionally discrete postmortem brain regions in 34 AD-afflicted individuals, using Affymetrix Human Genome U133 Plus 2.0 microarrays. These regions include the entorhinal cortex, hippocampus, middle temporal gyrus, posterior cingulate cortex, superior frontal gyrus, and primary visual cortex. This study is predicated on previous parallel research on the postmortem brains of the same six regions in 14 healthy elderly individuals, for which LCM neurons were similarly processed for expression analysis. We identified significant regional differential expression in AD brains compared with control brains including expression changes of genes previously implicated in AD pathogenesis, particularly with regard to tangle and plaque formation. Pinpointing the expression of factors that may play a role in AD pathogenesis provides a foundation for future identification of new targets for improved AD therapeutics. We provide this carefully phenotyped, laser capture microdissected intraindividual brain region expression data set to the community as a public resource.
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Affiliation(s)
- Winnie S Liang
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, Arizona 85004, USA
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Hassan MJ, Khurshid M, Azeem Z, John P, Ali G, Chishti MS, Ahmad W. Previously described sequence variant in CDK5RAP2 gene in a Pakistani family with autosomal recessive primary microcephaly. BMC MEDICAL GENETICS 2007; 8:58. [PMID: 17764569 PMCID: PMC2072945 DOI: 10.1186/1471-2350-8-58] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2007] [Accepted: 09/01/2007] [Indexed: 11/10/2022]
Abstract
Background Autosomal Recessive Primary Microcephaly (MCPH) is a disorder of neurogenic mitosis. MCPH leads to reduced cerebral cortical volume and hence, reduced head circumference associated with mental retardation of variable degree. Genetic heterogeneity is well documented in patients with MCPH with six loci known, while pathogenic sequence variants in four respective genes have been identified so far. Mutations in CDK5RAP2 gene at MCPH3 locus have been least involved in causing MCPH phenotype. Methods All coding exons and exon/intron splice junctions of CDK5RAP2 gene were sequenced in affected and normal individuals of Pakistani MCPH family of Kashmiri origin, which showed linkage to MCPH3 locus on chromosome 9q33.2. Results A previously described nonsense mutation [243 T>A (S81X)] in exon 4 of CDK5RAP2 gene has been identified in the Pakistani family, presented here, with MCPH Phenotype. Genomic and cDNA sequence comparison revealed that the exact nomenclature for this mutation is 246 T>A (Y82X). Conclusion Recurrent observation of Y82X mutation in CDK5RAP2 gene in this Pakistani family may be a sign of confinement of a rare ancestral haplotype carrying this pathogenic variant within Northern Pakistani population, as this has not been reported in any other population.
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Affiliation(s)
- Muhammad Jawad Hassan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Maryam Khurshid
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Zahid Azeem
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Peter John
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Ghazanfar Ali
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Muhammad Salman Chishti
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Wasim Ahmad
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
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Anne SL, Saudou F, Humbert S. Phosphorylation of huntingtin by cyclin-dependent kinase 5 is induced by DNA damage and regulates wild-type and mutant huntingtin toxicity in neurons. J Neurosci 2007; 27:7318-28. [PMID: 17611284 PMCID: PMC6794597 DOI: 10.1523/jneurosci.1831-07.2007] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Huntingtin is an antiapoptotic protein that becomes toxic when its polyglutamine stretch is expanded, resulting in Huntington's disease (HD). Protein context and posttranslational modifications regulate huntingtin toxicity. Identifying signaling pathways that act on huntingtin is, therefore, key to understanding huntingtin function in normal and pathological conditions. We show here that huntingtin is phosphorylated by the cyclin-dependent kinase 5 (Cdk5) at serines 1181 and 1201. Phosphorylation can be induced by DNA damage in vitro and in vivo. The state of huntingtin phosphorylation is a crucial regulator of neuronal cell death. Absence of phosphorylation of huntingtin at serines 1181 and 1201 confers toxic properties to wild-type huntingtin in a p53-dependent manner in striatal neurons and accelerates neuronal death induced by DNA damage. In contrast, phosphorylation at serines 1181 and 1201 protects against polyQ-induced toxicity. Finally, we show in late stages of HD a sustained DNA damage that is associated with a decrease in Cdk5/p35 levels. We propose that wild-type huntingtin is a component of the DNA damage response signal in neurons and that the Cdk5/DNA damage pathway is dysregulated in HD.
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Affiliation(s)
- Sandrine L. Anne
- Institut Curie and
- Centre National de la Recherche Scientifique Unité Mixte de Recherche 146, F-91405 Orsay, France
| | - Frédéric Saudou
- Institut Curie and
- Centre National de la Recherche Scientifique Unité Mixte de Recherche 146, F-91405 Orsay, France
| | - Sandrine Humbert
- Institut Curie and
- Centre National de la Recherche Scientifique Unité Mixte de Recherche 146, F-91405 Orsay, France
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Mazanetz MP, Fischer PM. Untangling tau hyperphosphorylation in drug design for neurodegenerative diseases. Nat Rev Drug Discov 2007; 6:464-79. [PMID: 17541419 DOI: 10.1038/nrd2111] [Citation(s) in RCA: 311] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Aggregation of hyperphosphorylated tau is one of the characteristic neuropathological lesions of Alzheimer's disease and other neurodegenerative disorders. Pharmacological modulation of tau hyperphosphorylation might represent a valid and feasible therapeutic strategy for such disorders. Here, we consider recent evidence supporting the validity of the three most relevant kinases affecting tau hyperphosphorylation - GSK3beta, CDK5 and ERK2 - as drug targets and describe progress in the design of inhibitors for these kinases.
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Affiliation(s)
- Michael P Mazanetz
- Centre for Biomolecular Sciences and School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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Tomomura M, Morita N, Yoshikawa F, Konishi A, Akiyama H, Furuichi T, Kamiguchi H. Structural and functional analysis of the apoptosis-associated tyrosine kinase (AATYK) family. Neuroscience 2007; 148:510-21. [PMID: 17651901 DOI: 10.1016/j.neuroscience.2007.05.048] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2007] [Revised: 05/25/2007] [Accepted: 05/30/2007] [Indexed: 10/23/2022]
Abstract
Apoptosis-associated tyrosine kinase (AATYK) is a protein kinase that is predominantly expressed in the nervous system and is involved in apoptosis and neurite growth of cerebellar granule cells. In this study, we cloned three new members of the mouse AATYK family, AATYK1B, AATYK2 and AATYK3. AATYK1B is a splicing variant of the previously reported AATYK1 (referred to as AATYK1A hereafter). In comparison with AATYK1A, these three AATYK members were characterized by having an extra N-terminal region that consists of a signal peptide-like sequence and a predicted transmembrane (TM) region, which is followed by a kinase domain and a long C-terminal domain. Both TM-containing AATYK isoforms (AATYK(+)TM: AATYK1B, 2, and 3) and TM-lacking isoform (AATYK(-)TM: AATYK1A) were recovered in membrane fractions, suggesting that AATYK(+)TM and AATYK(-)TM are transmembrane- and peripheral-membrane protein kinases, respectively. AATYK1A was recovered in the soluble fraction when the cells were treated with 2-bromo palmitate, suggesting that AATYK1A associates with membrane via palmitoylation. The kinase domain was highly conserved among all AATYK members and was shown to be catalytically active. Three AATYK family members were predominantly expressed in adult mouse brains with almost similar expression profiles: widespread distribution over the various brain regions, especially in the cerebellum and hippocampus, and up-regulated expression during development of the cerebellum. In cultured cerebellar granule cells, AATYK1 was abundantly localized in both soma and axons, AATYK2 distribution was restricted to soma, and AATYK3 was punctately present over the cells. AATYK1 was concentrated in the central domain of growth cones of dorsal root ganglion neurons. Our results indicate that AATYK family members are brain-dominant and membrane-associated kinases with slightly different distribution patterns in the developing and adult mouse brain, which may be involved in fine regulation of neuronal functions including neurite extension and apoptosis.
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Affiliation(s)
- M Tomomura
- Laboratory for Molecular Neurogenesis, Laboratory for Neuronal Growth Mechanisms, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
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Liang ZQ, Wang X, Li LY, Wang Y, Chen RW, Chuang DM, Chase TN, Qin ZH. Nuclear factor-kappaB-dependent cyclin D1 induction and DNA replication associated with N-methyl-D-aspartate receptor-mediated apoptosis in rat striatum. J Neurosci Res 2007; 85:1295-309. [PMID: 17385714 DOI: 10.1002/jnr.21248] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cell cycle reentry has been found during apoptosis of postmitotic neurons under certain pathological conditions. To evaluate whether nuclear factor-kappaB (NF-kappaB) activation promotes cell cycle entry and neuronal apoptosis, we studied the relation among NF-kappaB-mediated cyclin induction, bromodeoxyuridine (BrdU) incorporation, and apoptosis initiation in rat striatal neurons following excitotoxic insult. Intrastriatally injected N-methyl-D-aspartate receptor agonist quinolinic acid (QA, 60 nmol) elicited a rise in cyclin D1 mRNA and protein levels (P<0.05). QA-induced NF-kappaB activation occurred in striatal neurons and nonneuronal cells and partially colocalized with elevated cyclin D1 immunoreactivity and TUNEL-positive nuclei. QA triggered DNA replication as evidenced by BrdU incorporation; some striatal BrdU-positive cells were identified as neurons by colocalization with NeuN. Blockade of NF-kappaB nuclear translocation with the recombinant peptide NF-kappaB SN50 attenuated the QA-induced elevation in cyclin D1 and BrdU incorporation. QA-induced internucleosomal DNA fragmentation was blunted by G(1)/S-phase cell cycle inhibitors. These findings suggest that NF-kappaB activation stimulates cyclin D1 expression and triggers DNA replication in striatal neurons. Excitotoxin-induced neuronal apoptosis may thus result from, at least partially, a failed cell cycle attempt.
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Affiliation(s)
- Zhong-Qin Liang
- Department of Pharmacology, Soochow University School of Medicine, Suzhou, China
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42
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Mitsios N, Pennucci R, Krupinski J, Sanfeliu C, Gaffney J, Kumar P, Kumar S, Juan‐Babot O, Slevin M. Expression of cyclin-dependent kinase 5 mRNA and protein in the human brain following acute ischemic stroke. Brain Pathol 2007; 17:11-23. [PMID: 17493033 PMCID: PMC8095526 DOI: 10.1111/j.1750-3639.2006.00031.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Neuronal cell death after brain ischemia may be regulated by activation of cyclin-dependent kinase 5 (Cdk5). In this study, expression of Cdk5 and its activator p35/p25 was examined in human post-mortem stroke tissue and in human cerebral cortical fetal neurons and human brain microvascular endothelial cells exposed to oxygen-glucose deficiency and reperfusion. The majority of patients demonstrated increased expression of Cdk5 and p-Cdk5 in stroke-affected tissue, with about a third showing increased p35 and p25 cleaved fragment as determined by Western blotting. An increase in Cdk5-, p-Cdk5- and p35-positive neurons and microvessels occurred in stroke-affected regions of patients. Staining of neurons became irregular and clumped in the cytoplasm, and nuclear translocation occurred, with colocalization of p35 and Cdk5. Association of Cdk5 with nuclear damage was demonstrated by coexpression of nuclear Cdk5 in TUNEL-positive neurons and microvessels in peri-infarcted regions. In vitro studies showed up-regulation and/or nuclear translocation of Cdk5, p-Cdk5 and p35 in neurons and endothelial cells subjected to oxygen-glucose deficiency, and strong staining was associated with propidium iodide positive nuclei, an indicator of cellular damage. These results provide new evidence for a role of Cdk5 in the events associated with response to ischemic injury in humans.
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Affiliation(s)
- Nicholas Mitsios
- School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester, UK
| | - Roberta Pennucci
- School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester, UK
| | - Jerzy Krupinski
- Servicio de Neurologia, Hospital Universitari de Bellvitge, Barcelona, Spain
| | - Coral Sanfeliu
- Department de Farmacologia i Toxicologia, IIBB, Barcelona, Spain
| | - John Gaffney
- School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester, UK
| | - Pat Kumar
- School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester, UK
| | - Shant Kumar
- Department of Pathology, Manchester University, Manchester, UK
| | | | - Mark Slevin
- School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester, UK
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43
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Bogush A, Pedrini S, Pelta-Heller J, Chan T, Yang Q, Mao Z, Sluzas E, Gieringer T, Ehrlich ME. AKT and CDK5/p35 Mediate Brain-derived Neurotrophic Factor Induction of DARPP-32 in Medium Size Spiny Neurons in Vitro. J Biol Chem 2007; 282:7352-9. [PMID: 17209049 DOI: 10.1074/jbc.m606508200] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Mature striatal medium size spiny neurons express the dopamine and cyclic AMP-regulated phosphoprotein, 32 kDa (DARPP-32), but little is known about the mechanisms regulating its levels or the specification of fully differentiated neuronal subtypes. Cell extrinsic molecules that increase DARPP-32 mRNA and/or protein levels include brain-derived neurotrophic factor (BDNF), retinoic acid, and estrogen. DARPP-32 induction by BDNF in vitro requires phosphatidylinositide 3-kinase (PI3K), but inhibition of phosphorylation of protein kinase B/Akt does not entirely abolish expression of DARPP-32. Moreover, the requirement for Akt has not been established. Using pharmacologic inhibitors of PI3K, Akt, and cyclin-dependent kinase 5 (cdk5) and constitutively active and dominant negative PI3K, Akt, cdk5, and p35 viruses in cultured striatal neurons, we measured BDNF-induced levels of DARPP-32 protein and/or mRNA. We demonstrated that both the PI3K/Akt/mammalian target of rapamycin and the cdk5/p35 signal transduction pathways contribute to the induction of DARPP-32 protein levels by BDNF and that the effects are on both the transcriptional and translational levels. It also appears that PI3K is upstream of cdk5/p35, and its activation can lead to an increase in p35 protein levels. These data support the presence of multiple signal transduction pathways mediating expression of DARPP-32 in vitro, including a novel, important pathway via by which PI3K regulates the contribution of cdk5/p35.
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Affiliation(s)
- Alexey Bogush
- Farber Institute for Neurosciences and Department of Neurology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA
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44
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Sultana R, Butterfield DA. Regional expression of key cell cycle proteins in brain from subjects with amnestic mild cognitive impairment. Neurochem Res 2006; 32:655-62. [PMID: 17006763 DOI: 10.1007/s11064-006-9123-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2006] [Indexed: 01/28/2023]
Abstract
Mild cognitive impairment (MCI) is regarded as a transition stage between the cognitive changes of normal aging and the more serious problems caused by Alzheimer's disease (AD). Previous studies had demonstrated increased expression of cell cycle proteins in AD brain. In the present study, we have analyzed the expression of the cell cycle proteins, CDK2, CDK5 and cyclin G1 in hippocampus and inferior parietal lobule (IPL) in subjects with amnestic mild cognitive impairment and control using Western blot analysis. The expression of CDK2, CDK5 and cyclin G1 were found to be significantly increased in MCI hippocampus as well as in IPL compared to control brain. These results suggest that some cells may have re-entered the cell cycle. However, the expression of CDK2 and CDK5 is greater in MCI hippocampus compared to those of MCI IPL, and hippocampus is a region that is severely affected by AD pathology. Since these proteins are involved directly or indirectly in microtubule destabilization and hyperphosphorylation of tau, and also in APP processing we hypothesize that cell cycle disturbance may be important contributor in the pathogenesis of AD.
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Affiliation(s)
- Rukhsana Sultana
- Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA
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45
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Camins A, Verdaguer E, Folch J, Pallàs M. Involvement of calpain activation in neurodegenerative processes. CNS DRUG REVIEWS 2006; 12:135-48. [PMID: 16958987 PMCID: PMC6494133 DOI: 10.1111/j.1527-3458.2006.00135.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
One of the challenges in the coming years will be to better understand the mechanisms of neuronal cell death with the objective of developing adequate drugs for the treatment of neurodegenerative disorders. Caspases and calpains are among the best-characterized cysteine proteases activated in brain disorders. Likewise, during the last decade, extensive research revealed that the deregulation of calpains activity is a key cytotoxic event in a variety of neurodegenerative disorders. Moreover, interest in the role of calpain in neurodegenerative processes is growing due to implication of the involvement of cdk5 in neurodegenerative diseases. Since calpain inhibitors appear to not only protect brain tissue from ischemia, but also to prevent neurotoxicity caused by such neurotoxins as beta-amyloid or 3-nitropropionic acid, the currently available data suggest that calpain and cdk5 play a key role in neuronal cell death. It seems clear that the inappropriate activation of cysteine proteases occurs not only during neuronal cell death, but may also contribute to brain pathology in ischemia and traumatic brain disorders. Pharmacological modulation of calpain activation may, therefore, be useful in the treatment of neurodegenerative disorders. It is possible, although difficult, to develop synthetic inhibitors of cysteine proteases, specifically calpains. The inhibition of calpain activation has recently emerged as a potential therapeutic target for the treatment of neurodegenerative diseases.
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Affiliation(s)
- Antoni Camins
- Unitat de Farmacologia i Farmacognòsia, Facultat de Farmàcia. Universitat de Barcelona, Nucli Universitari de Pedralbes, Barcelona, Spain
| | - Ester Verdaguer
- Departament de Farmacologia i Toxicologia, IIBB‐CSIC, IDIBAPS, Barcelona, Spain
| | - Jaume Folch
- Unitat de Bioquímica, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili. Reus (Tarragona), Spain
| | - Mercè Pallàs
- Unitat de Farmacologia i Farmacognòsia, Facultat de Farmàcia. Universitat de Barcelona, Nucli Universitari de Pedralbes, Barcelona, Spain
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Otyepka M, Bártová I, Kríz Z, Koca J. Different Mechanisms of CDK5 and CDK2 Activation as Revealed by CDK5/p25 and CDK2/Cyclin A Dynamics. J Biol Chem 2006; 281:7271-81. [PMID: 16407256 DOI: 10.1074/jbc.m509699200] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A detailed analysis is presented of the dynamics of human CDK5 in complexes with the protein activator p25 and the purine-like inhibitor roscovitine. These and other findings related to the activation of CDK5 are critically reviewed from a molecular perspective. In addition, the results obtained on the behavior of CDK5 are compared with data on CDK2 to assess the differences and similarities between the two kinases in terms of (i) roscovitine binding, (ii) regulatory subunit association, (iii) conformational changes in the T-loop following CDK/regulatory subunit complex formation, and (iv) specificity in CDK/regulatory subunit recognition. An energy decomposition analysis, used for these purposes, revealed why the binding of p25 alone is sufficient to stabilize the extended active T-loop conformation of CDK5, whereas the equivalent conformational change in CDK2 requires both the binding of cyclin A and phosphorylation of the Thr(160) residue. The interaction energy of the CDK5 T-loop with p25 is about 26 kcal.mol(-1) greater than that of the CDK2 T-loop with cyclin A. The binding pattern between CDK5 and p25 was compared with that of CDK2/cyclin A to find specific regions involved in CDK/regulatory subunit recognition. The analyses performed revealed that the alphaNT-helix of cyclin A interacts with the alpha6-alpha7 loop and the alpha7 helix of CDK2, but these regions do not interact in the CDK5/p25 complex. Further differences between the CDK5/p25 and CDK2/cyclin A systems studied are discussed with respect to their specific functionality.
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Affiliation(s)
- Michal Otyepka
- Department of Physical Chemistry and Center for Biomolecules and Complex Molecular Systems, Palacký University, tr. Svobody 26, 771 46 Olomouc, Czech Republic.
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Abstract
The cyclin-dependent kinase-5 (Cdk5) is critical to normal mammalian development and has been implicated in synaptic plasticity, learning, and memory in the adult brain. But Cdk-5 activity has also been linked to neurodegenerative diseases. Could a single protein have opposing effects? A new study shows that production of a neuronal protein capable of regulating Cdk-5 activity can turn Cdk-5 from "good" to "bad." The findings may have implications for the development and treatment of conditions like Alzheimer's disease.
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Affiliation(s)
- Qing Guo
- Department of Physiology, University of Oklahoma Health Sciences Center, College of Medicine, Oklahoma City, OK 73104, USA.
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48
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Bond J, Woods CG. Cytoskeletal genes regulating brain size. Curr Opin Cell Biol 2006; 18:95-101. [PMID: 16337370 DOI: 10.1016/j.ceb.2005.11.004] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Accepted: 11/24/2005] [Indexed: 11/22/2022]
Abstract
One of the most notable trends in human evolution is the dramatic increase in brain size that has occurred in the great ape clade, culminating in humans. Of particular interest is the vast expanse of the cerebral cortex, which is believed to have resulted in our ability to perform higher cognitive functions. Recent investigations of congenital microcephaly in humans have resulted in the identification of several genes that non-redundantly and specifically influence mammalian brain size. These genes appear to affect neural progenitor cell number through microtubular organisation at the centrosome.
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Affiliation(s)
- Jacquelyn Bond
- Molecular Medicine Unit, University of Leeds, Clinical Sciences Building, St James's University Hospital, Beckett St., Leeds, West Yorkshire, LS9 7TF, UK.
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49
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Venturin M, Moncini S, Villa V, Russo S, Bonati MT, Larizza L, Riva P. Mutations and novel polymorphisms in coding regions and UTRs of CDK5R1 and OMG genes in patients with non-syndromic mental retardation. Neurogenetics 2006; 7:59-66. [PMID: 16425041 DOI: 10.1007/s10048-005-0026-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2005] [Accepted: 11/29/2005] [Indexed: 11/25/2022]
Abstract
Mental retardation (MR) is displayed by 57% of NF1 patients with microdeletion syndrome as a result of 17q11.2 region haploinsufficiency. We considered the cyclin-dependent kinase 5 regulatory subunit 1 (CDK5R1) and oligodendrocyte-myelin glycoprotein (OMG) genes, mapping in the NF1 microdeleted region, as candidate genes for MR susceptibility. CDK5R1 encodes for a neurone-specific activator of cyclin-dependent kinase 5 (CDK5) involved in neuronal migration during central nervous system development. OMG encodes for an inhibitor of neurite outgrowth by the binding to the Nogo-66 receptor (RTN4R). CDK5R1 and OMG genes are characterized by large 3' and 5' untranslated regions (UTRs), where we predict the presence of several transcription/translation regulatory elements. We screened 100 unrelated Italian patients affected by unspecific MR for mutations in CDK5R1 and OMG coding regions and in their 3' or 5' UTRs. Four novel mutations and two novel polymorphisms for CDK5R1 and three novel mutations for OMG were detected, including two missense changes (c.323C>T; A108V in CDK5R1 and c.1222A>G; T408A in OMG), one synonymous codon variant (c.532C>T; L178L in CDK5R1), four variants in CDK5R1 3'UTR and two changes in OMG 5'UTR. All the mutations were absent in 370 chromosomes from normal subjects. The allelic frequencies of the two novel polymorphisms in CDK5R1 3'UTR were established in both 185 normal and 100 mentally retarded subjects. Prediction of mRNA and protein secondary structures revealed that two changes lead to putative structural alterations in the mutated c.2254C>G CDK5R1 3'UTR and in OMG T408A gene product.
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Affiliation(s)
- Marco Venturin
- Department of Biology and Genetics, Medical Faculty, University of Milan, Via Viotti 3/5, 20133, Milan, Italy
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50
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Malumbres M, Barbacid M. Mammalian cyclin-dependent kinases. Trends Biochem Sci 2005; 30:630-41. [PMID: 16236519 DOI: 10.1016/j.tibs.2005.09.005] [Citation(s) in RCA: 869] [Impact Index Per Article: 45.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2005] [Revised: 08/11/2005] [Accepted: 09/15/2005] [Indexed: 02/02/2023]
Abstract
Cyclin-dependent kinases (Cdks) are the catalytic subunits of a family of mammalian heterodimeric serine/threonine kinases that have been implicated in the control of cell-cycle progression, transcription and neuronal function. Recent genetic evidence obtained with gene-targeted mice has shown that Cdk4 and Cdk6 are not needed for entry into the cell cycle after mitogenic stimuli and organogenesis; however, they are essential for the proliferation of some endocrine and hematopoietic cells. Cdk2 is also dispensable for the mitotic cell cycle. Indeed, mice without Cdk2 are normal except for their complete sterility: unexpectedly, Cdk2 is crucial for the first meiotic division of male and female germ cells. These findings have important implications both for our current understanding of the role of Cdks in regulating the mammalian cell cycle and for their potential use as therapeutic targets in cancer.
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Affiliation(s)
- Marcos Malumbres
- Molecular Oncology Programme, Centro Nacional de Investigaciones Oncológicas, Melchor Fernández Almagro 3, E-28029 Madrid, Spain.
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