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Pandey AK, Trivedi V. Hemin competitively inhibits HSPA8 ATPase activity mitigating its foldase function. Arch Biochem Biophys 2024; 752:109889. [PMID: 38215959 DOI: 10.1016/j.abb.2024.109889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 12/19/2023] [Accepted: 01/09/2024] [Indexed: 01/14/2024]
Abstract
Hemolysis in red blood cells followed by hemoglobin degradation results in high hemin levels in the systemic circulation. Such a level of hemin is disastrous for cells and tissues and is considerably responsible for the pathologies of diseases like severe malaria. Hemin's hydrophobic chemical nature and structure allow it to bind several proteins leading to their functional modification. Such modifications in physiologically relevant proteins can have a high impact on various cellular processes. HSPA8 is a chaperone that has a protective role in oxidative stress by aiding protein refolding. Through ATPase activity assays we found that hemin can competitively inhibit ATP hydrolysis by the chaperone HSPA8. Hemin as such does not affect the structural integrity of the protein which is inferred from CD spectroscopy and Gel filtration but it hinders the ATP-dependent foldase function of the chaperone. HSPA8 was not able to cause the refolding of the model protein lysozyme in the presence of hemin. The loss in HSPA8 function was due to competition between hemin and ATP as the chaperone was able to regain the foldase function when the concentration of ATP was gradually increased with hemin present at the inhibitory concentration. In-silico studies to establish the competition for the specific binding site revealed that ATP was unable to replace hemin from the ATP binding pocket of HSPA8 and was forced to form a non-specific and unstable complex. In-vitro isothermal calorimetry revealed that the affinity of ATP for binding to HSPA8 was reduced 22 folds in the presence of hemin. The prevention of HSPA8's cytoprotective function by hemin can be a major factor contributing to the overall cellular damage during hemin accumulation in the case of severe malaria and other hemolytic diseases.
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Affiliation(s)
- Alok Kumar Pandey
- Malaria Research Group, Department of Bioscience and Bioengineering, Indian Institute of Technology-Guwahati, Guwahati, 781039, Assam, India
| | - Vishal Trivedi
- Malaria Research Group, Department of Bioscience and Bioengineering, Indian Institute of Technology-Guwahati, Guwahati, 781039, Assam, India.
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Xu W, Sun Y, Zhao S, Zhao J, Zhang J. Identification and validation of autophagy-related genes in primary open-angle glaucoma. BMC Med Genomics 2023; 16:287. [PMID: 37968618 PMCID: PMC10648356 DOI: 10.1186/s12920-023-01722-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 10/31/2023] [Indexed: 11/17/2023] Open
Abstract
BACKGROUND As the most common type of glaucoma, the etiology of primary open-angle glaucoma (POAG) has not been unified. Autophagy may affect the occurrence and development of POAG, while the specific mechanism and target need to be further explored. METHODS The GSE27276 dataset from the Gene Expression Omnibus (GEO) database and the autophagy gene set from the GeneCards database were selected to screen differentially expressed autophagy-related genes (DEARGs) of POAG. Hub DEARGs were selected by constructing protein-protein interaction (PPI) networks and utilizing GSE138125 dataset. Subsequently, immune cell infiltration analysis, genome-wide association study (GWAS) analysis, gene set enrichment analysis (GSEA) and other analyses were performed on the hub genes. Eventually, animal experiments were performed to verify the mRNA levels of the hub genes by quantitative real time polymerase chain reaction (qRT-PCR). RESULTS A total of 67 DEARGs and 2 hub DEARGs, HSPA8 and RPL15, were selected. The hub genes were closely related to the level of immune cell infiltration. GWAS analysis confirmed that the causative regions of the 2 hub genes in glaucoma were on chromosome 11 and chromosome 3, respectively. GSEA illustrated that pathways enriched for highly expressed HSPA8 and RPL15 contained immunity, autophagy, gene expression and energy metabolism-related pathways. qRT-PCR confirmed that the expression of Hspa8 and Rpl15 in the rat POAG model was consistent with the results of bioinformatics analysis. CONCLUSIONS This study indicated that HSPA8 and RPL15 may affect the progression of POAG by regulating autophagy and provided new ideas for the pathogenesis and treatment of POAG.
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Affiliation(s)
- Wanjing Xu
- Ophthalmology Department of QingPu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China.
| | - Yuhao Sun
- Otolaryngology Department of QingPu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China
| | - Shuang Zhao
- Graduate School of Shandong First Medical University, Jinan, China
| | - Jun Zhao
- Ophthalmology Department of Linyi People's Hospital, Linyi, China
| | - Juanmei Zhang
- Ophthalmology Department of Linyi People's Hospital, Linyi, China
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3
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Bednarczyk M, Muc-Wierzgoń M, Dzięgielewska-Gęsiak S, Waniczek D. Relationship between the Ubiquitin-Proteasome System and Autophagy in Colorectal Cancer Tissue. Biomedicines 2023; 11:3011. [PMID: 38002011 PMCID: PMC10669458 DOI: 10.3390/biomedicines11113011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 10/04/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
BACKGROUND Dysregulation of the autophagy process via ubiquitin is associated with the occurrence of a number of diseases, including cancer. The present study analyzed the changes in the transcriptional activity of autophagy-related genes and the ubiquitination process (UPS) in colorectal cancer tissue. (2) Methods: The process of measuring the transcriptional activity of autophagy-related genes was analyzed by comparing colorectal cancer samples from four clinical stages I-IV (CS I-IV) of adenocarcinoma to the control (C). The transcriptional activity of genes associated with the UPS pathway was determined via the microarray technique (HG-U133A, Affymetrix). (3) Results: Of the selected genes, only PTEN-induced kinase 1 (PINK1) indicated statistical significance for all groups of colon cancer tissue transcriptome compared to the control. The transcriptional activity of the protein tyrosine phosphatase non-receptor type 22 (PTPN22) gene increased in all stages of the cancer, but the p-value was only less than 0.05 in CSIV vs. C. Forkhead box O1 (FOXO 1) and ubiquitin B (UBB) are statistically overexpressed in CSI. (4) Conclusions: The pathological expression changes in the studied proteins observed especially in the early stages of colorectal cancer suggest that the dysregulation of ubiquitination and autophagy processes occur during early neoplastic transformation. Stopping or slowing down the processes of removal of damaged proteins and their accumulation may contribute to tumor progression and poor prognosis.
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Affiliation(s)
- Martyna Bednarczyk
- Department of Hematology and Cancer Prevention, Medical University of Silesia in Katowice, 40-055 Katowice, Poland;
| | - Małgorzata Muc-Wierzgoń
- Department of Preventive Medicine, Medical University of Silesia in Katowice, 40-055 Katowice, Poland;
| | | | - Dariusz Waniczek
- Department of Surgical Nursing and Propaedeutics of Surgery, Medical University of Silesia in Katowice, 40-055 Katowice, Poland;
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Green R, Mayilsamy K, McGill AR, Martinez TE, Chandran B, Blair LJ, Bickford PC, Mohapatra SS, Mohapatra S. SARS-CoV-2 infection increases the gene expression profile for Alzheimer's disease risk. Mol Ther Methods Clin Dev 2022; 27:217-229. [PMID: 36187720 PMCID: PMC9508696 DOI: 10.1016/j.omtm.2022.09.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/21/2022] [Indexed: 02/02/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has caused over 600,000,000 infections globally thus far. Up to 30% of individuals with mild to severe disease develop long COVID, exhibiting diverse neurologic symptoms including dementias. However, there is a paucity of knowledge of molecular brain markers and whether these can precipitate the onset of Alzheimer's disease (AD). Herein, we report the brain gene expression profiles of severe COVID-19 patients showing increased expression of innate immune response genes and genes implicated in AD pathogenesis. The use of a mouse-adapted strain of SARS-CoV-2 (MA10) in an aged mouse model shows evidence of viral neurotropism, prolonged viral infection, increased expression of tau aggregator FKBP51, interferon-inducible gene Ifi204, and complement genes C4 and C5AR1. Brain histopathology shows AD signatures including increased tau-phosphorylation, tau-oligomerization, and α-synuclein expression in aged MA10 infected mice. The results of gene expression profiling of SARS-CoV-2-infected and AD brains and studies in the MA10 aged mouse model taken together, for the first time provide evidence suggesting that SARS-CoV-2 infection alters expression of genes in the brain associated with the development of AD. Future studies of common molecular markers in SARS-CoV-2 infection and AD could be useful for developing novel therapies targeting AD.
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Affiliation(s)
- Ryan Green
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- Department of Internal Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Karthick Mayilsamy
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Andrew R. McGill
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- Department of Internal Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Taylor E. Martinez
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Bala Chandran
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
| | - Laura J. Blair
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- Byrd Alzheimer’s Research Institute, University of South Florida, Tampa, FL 33613, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Paula C. Bickford
- Center of Excellence for Aging and Brain Repair, Departments of Neurosurgery and Brain Repair, and Molecular Pharmacology and Physiology, Morsani College of Medicine, Tampa, FL 33613, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Shyam S. Mohapatra
- Department of Internal Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
| | - Subhra Mohapatra
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
- James A Haley VA Hospital, Tampa, FL 33612, USA
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Zhang Y, Qiao X, Liu L, Han W, Liu Q, Wang Y, Xie T, Tang Y, Wang T, Meng J, Ye A, He S, Chen R, Chen C. Long noncoding RNA MAGI2-AS3 regulates the H2O2 level and cell senescence via HSPA8. Redox Biol 2022; 54:102383. [PMID: 35797800 PMCID: PMC9287730 DOI: 10.1016/j.redox.2022.102383] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/16/2022] [Accepted: 06/21/2022] [Indexed: 11/16/2022] Open
Affiliation(s)
- Yingmin Zhang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xinhua Qiao
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Lihui Liu
- Key Laboratory of RNA Biology, Center for Big Data Research in Health, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Wensheng Han
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qinghua Liu
- Key Laboratory of RNA Biology, Center for Big Data Research in Health, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yuanyuan Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ting Xie
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yiheng Tang
- University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of RNA Biology, Center for Big Data Research in Health, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Tiepeng Wang
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jiao Meng
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Aojun Ye
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shunmin He
- University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of RNA Biology, Center for Big Data Research in Health, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Runsheng Chen
- University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of RNA Biology, Center for Big Data Research in Health, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Chang Chen
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
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Iwasa N, Matsui TK, Iguchi N, Kinugawa K, Morikawa N, Sakaguchi YM, Shiota T, Kobashigawa S, Nakanishi M, Matsubayashi M, Nagata R, Kikuchi S, Tanaka T, Eura N, Kiriyama T, Izumi T, Saito K, Kataoka H, Saito Y, Kimura W, Wanaka A, Nishimura Y, Mori E, Sugie K. Gene Expression Profiles of Human Cerebral Organoids Identify PPAR Pathway and PKM2 as Key Markers for Oxygen-Glucose Deprivation and Reoxygenation. Front Cell Neurosci 2021; 15:605030. [PMID: 34168538 PMCID: PMC8217463 DOI: 10.3389/fncel.2021.605030] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 05/10/2021] [Indexed: 12/13/2022] Open
Abstract
Ischemic stroke is one of the most common neurological diseases. However, the impact of ischemic stroke on human cerebral tissue remains largely unknown due to a lack of ischemic human brain samples. In this study, we applied cerebral organoids derived from human induced pluripotent stem cells to evaluate the effect of oxygen-glucose deprivation/reoxygenation (OGD/R). Pathway analysis showed the relationships between vitamin digestion and absorption, fat digestion and absorption, peroxisome proliferator-activated receptor (PPAR) signaling pathway, and complement and coagulation cascades. Combinational verification with transcriptome and gene expression analysis of different cell types revealed fatty acids-related PPAR signaling pathway and pyruvate kinase isoform M2 (PKM2) as key markers of neuronal cells in response to OGD/R. These findings suggest that, although there remain some limitations to be improved, our ischemic stroke model using human cerebral organoids would be a potentially useful tool when combined with other conventional two-dimensional (2D) mono-culture systems.
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Affiliation(s)
- Naoki Iwasa
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Takeshi K Matsui
- Department of Neurology, Nara Medical University, Kashihara, Japan.,Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Naohiko Iguchi
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Kaoru Kinugawa
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Naritaka Morikawa
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | | | - Tomo Shiota
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Shinko Kobashigawa
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Mari Nakanishi
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Masaya Matsubayashi
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Riko Nagata
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Sotaro Kikuchi
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan
| | - Tatsuhide Tanaka
- Department of Anatomy and Neuroscience, Nara Medical University, Kashihara, Japan
| | - Nobuyuki Eura
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Takao Kiriyama
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Tesseki Izumi
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Kozue Saito
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Hiroshi Kataoka
- Department of Neurology, Nara Medical University, Kashihara, Japan
| | - Yuichi Saito
- Laboratory for Heart Regeneration, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Wataru Kimura
- Laboratory for Heart Regeneration, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Akio Wanaka
- Department of Anatomy and Neuroscience, Nara Medical University, Kashihara, Japan
| | - Yuhei Nishimura
- Department of Integrative Pharmacology, Mie University Graduate School of Medicine, Tsu, Japan
| | - Eiichiro Mori
- Department of Future Basic Medicine, Nara Medical University, Kashihara, Japan.,V-iCliniX Laboratory, Nara Medical University, Kashihara, Japan
| | - Kazuma Sugie
- Department of Neurology, Nara Medical University, Kashihara, Japan
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Auzmendi-Iriarte J, Matheu A. Impact of Chaperone-Mediated Autophagy in Brain Aging: Neurodegenerative Diseases and Glioblastoma. Front Aging Neurosci 2021; 12:630743. [PMID: 33633561 PMCID: PMC7901968 DOI: 10.3389/fnagi.2020.630743] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 12/21/2020] [Indexed: 12/11/2022] Open
Abstract
Brain aging is characterized by a time-dependent decline of tissue integrity and function, and it is a major risk for neurodegenerative diseases and brain cancer. Chaperone-mediated autophagy (CMA) is a selective form of autophagy specialized in protein degradation, which is based on the individual translocation of a cargo protein through the lysosomal membrane. Regulation of processes such as proteostasis, cellular energetics, or immune system activity has been associated with CMA, indicating its pivotal role in tissue homeostasis. Since first studies associating Parkinson’s disease (PD) to CMA dysfunction, increasing evidence points out that CMA is altered in both physiological and pathological brain aging. In this review article, we summarize the current knowledge regarding the impact of CMA during aging in brain physiopathology, highlighting the role of CMA in neurodegenerative diseases and glioblastoma, the most common and aggressive brain tumor in adults.
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Affiliation(s)
| | - Ander Matheu
- Cellular Oncology Group, Biodonostia Health Research Institute, San Sebastian, Spain.,CIBER de Fragilidad y Envejecimiento Saludable (CIBERfes), Madrid, Spain.,IKERBASQUE, Basque Foundation, Bilbao, Spain
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8
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Aasly JO. Inflammatory Diseases Among Norwegian LRRK2 Mutation Carriers. A 15-Years Follow-Up of a Cohort. Front Neurosci 2021; 15:634666. [PMID: 33584195 PMCID: PMC7876287 DOI: 10.3389/fnins.2021.634666] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 01/06/2021] [Indexed: 12/29/2022] Open
Abstract
The first families with LRRK2 related Parkinson’s disease (PD) were presented around 15 years ago and numerous papers have described the characteristics of the LRRK2 phenotype. The prevalence of autosomal dominant PD varies around the world mainly depending on local founder effects. The highest prevalence of LRRK2 G2019S PD in Norway is located to the central part of the country and most families could be traced back to common ancestors. The typical Norwegian LRRK2 phenotype is not different from classical PD and similar to that seen in most other LRRK2 families. The discovery of LRRK2 PD has allowed us to follow-up multi-incident families and to study their phenotype longitudinally. In the Norwegian LRRK2 families there has been a significantly higher incidence of inflammatory diseases like multiple sclerosis and rheumatoid arthritis that seen in other PD populations. Recent studies in LRRK2 mechanisms have indicated that this protein may be crucial in initiating disease processes. In this short survey of 100 Norwegian mutation carriers followed through more than 15 years are presented. The prevalence of inflammatory diseases among these cases is highlighted. The role of LRRK2 in the conversion process from carrier status to PD phenotype is still unknown and disease generating mechanisms important for initiating LRRK2 PD are still to be identified.
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Affiliation(s)
- Jan O Aasly
- Department of Neurology, St. Olavs Hospital, Trondheim, Norway.,Department of Neuromedicine and Movement Science (INB), Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
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Expression of HSPA8 in Nucleus Pulposus of Lumbar Intervertebral Disc and Its Effect on Degree of Degeneration. Adv Ther 2020; 37:390-401. [PMID: 31755037 DOI: 10.1007/s12325-019-01136-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Indexed: 12/22/2022]
Abstract
INTRODUCTION This study aimed to investigate the expression of a 70-kDa heat shock protein [heat shock 70-kDa protein 8 (HSPA8)/heat shock protein 70 (Hsc70)] in human degenerative lumbar intervertebral discs and its relationship with the degree of degeneration of human intervertebral discs. METHODS A total of 72 cases of lumbar intervertebral disc nucleus pulposus tissues were collected. Among these, 18 cases of nucleus pulposus tissue were assigned to the control group, while 54 cases of nucleus pulposus tissues were assigned to the experimental group. According to the preoperative MRI, cases in the experimental group were further divided into three groups: protrusion group (n = 18), extrusion group (n = 18), and sequestration group (n = 18). Western blot was performed to determine the relative expression of HSPA8 in the nucleus pulposus in each group. Hematoxylin and eosin staining was performed to determine the number of nucleus pulposus cells, morphological differences, and cell densities of the degenerated intervertebral discs and normal intervertebral discs. Immunohistochemistry was performed to determine the expression of HSPA8 in nucleus pulposus tissues in each group. RESULTS Hematoxylin and eosin staining results: There were significant differences in cell morphology and number between the control group and the experimental group. Furthermore, there were significant differences in cell density (F = 936.80, P < 0.01). Immunohistochemistry results: HSPA8 was expressed in lumbar intervertebral disc nucleus pulposus tissues, and its expression of gradually decreased with the severity of the disease, and the differences were significant (F = 2110.43, P < 0.01). Western blot results: The expression of HSPA8 in human degenerative nucleus pulposus tissues gradually decreased, and the differences were significant (F = 1841.72, P < 0.01). CONCLUSION HSPA8 is stably expressed in human intervertebral disc nucleus pulposus tissues, and its expression is associated with the degree of intervertebral disc degeneration.
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Duggan M, Torkzaban B, Ahooyi TM, Khalili K, Gordon J. Age-related neurodegenerative diseases. J Cell Physiol 2019; 235:3131-3141. [PMID: 31556109 DOI: 10.1002/jcp.29248] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 09/03/2019] [Indexed: 12/12/2022]
Abstract
Converging evidence indicates the dysregulation of unique cytosolic compartments called stress granules (SGs) might facilitate the accumulation of toxic protein aggregates that underlie many age-related neurodegenerative pathologies (ANPs). SG dynamics are particularly susceptible to the cellular conditions that are commonly induced by aging, including the elevation in reactive oxygen species and increased concentration of aggregate-prone proteins. In turn, the persistent formation of these compartments is hypothesized to serve as a seed for subsequent protein aggregation. Notably, the protein quality control (PQC) machinery responsible for inhibiting persistent SGs (e.g., Hsc70-BAG3) can become compromised with age, suggesting that the modulation of such PQC mechanisms could reliably inhibit pathological processes of ANPs. As exemplified in the context of accelerated aging syndromes (i.e., Hutchinson-Gilford progeria), PQC enhancement is emerging as a potential therapeutic strategy, indicating similar techniques might be applied to ANPs. Collectively, these recent findings advance our understanding of how the processes that might facilitate protein aggregation are particularly susceptible to aging conditions, and present investigators with an opportunity to develop novel targets for ANPs.
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Affiliation(s)
- Michael Duggan
- Department of Neuroscience, Center for Neurovirology, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Bahareh Torkzaban
- Department of Neuroscience, Center for Neurovirology, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Taha Mohseni Ahooyi
- Department of Neuroscience, Center for Neurovirology, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Kamel Khalili
- Department of Neuroscience, Center for Neurovirology, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
| | - Jennifer Gordon
- Department of Neuroscience, Center for Neurovirology, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
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11
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Martyna B, Małgorzata MW, Nikola Z, Beniamin G, Urszula M, Grażyna J. Expression Profile of Genes Associated with the Proteins Degradation Pathways in Colorectal adenocarcinoma. Curr Pharm Biotechnol 2019; 20:551-561. [DOI: 10.2174/1389201020666190516090744] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 01/01/2019] [Accepted: 05/02/2019] [Indexed: 11/22/2022]
Abstract
Background:Changes in expression of genes associated with proteins or organelles degradation system in the cell may be a cause or signal to carcinogenesis. Thus, the aim of this study was to assess the profile of gene expression linked to the degradation systems of proteins or organelles in histo-pathologically confirmed colorectal adenocarcinoma in relation to normal colon tissue.Methods:Using oligonucleotide microarrays and GeneSpring 13.0, and PANTHER 13.1 software’s we characterized 1095 mRNAs linked to the degradation system of proteins and organelles in sections of colorectal cancer from patients at various clinical stages of disease. Subsequent analyses with restrictive assumptions narrowed down the number of genes differentiating cancer, assuming a P-value of less than 0.05.Results:We found that most of the significant genes were silenced in the development of colorectal cancer. The FOXO1 had the lowest fold change value in the first clinical stage (CSI) comparing to the control. The HSPA8 was up-regulated in the two early clinical stages (CSI and CSII), and UBB only in the CSI. Only little-known PTPN22 showed increasing expression at all stages.Conclusion:In summary, the examined colorectal adenocarcinoma samples were characterized by almost complete silencing of the significant genes associated with the degradation of proteins and mitochondria in transcriptomic level. The FOXO1, HSPA8 and UBB genes may become potential diagnostic and/or therapeutic targets in the early stage of this cancer.
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Affiliation(s)
- Bednarczyk Martyna
- Department and Clinic of Internal Diseases, School of Public Health, Medical University of Silesia, Katowice, Poland
| | - Muc-Wierzgoń Małgorzata
- Department and Clinic of Internal Diseases, School of Public Health, Medical University of Silesia, Katowice, Poland
| | - Zmarzły Nikola
- Department of Molecular Biology, School of Pharmacy and the Division of Laboratory Medicine, Medical University of Silesia, Katowice, Poland
| | - Grabarek Beniamin
- Department of Molecular Biology, School of Pharmacy and the Division of Laboratory Medicine, Medical University of Silesia, Katowice, Poland
| | - Mazurek Urszula
- Department of Molecular Biology, School of Pharmacy and the Division of Laboratory Medicine, Medical University of Silesia, Katowice, Poland
| | - Janikowska Grażyna
- Department of Analytical Chemistry, School of Pharmacy and the Division of Laboratory Medicine, Medical University of Silesia, Katowice, Poland
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12
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Loeffler DA. Influence of Normal Aging on Brain Autophagy: A Complex Scenario. Front Aging Neurosci 2019; 11:49. [PMID: 30914945 PMCID: PMC6421305 DOI: 10.3389/fnagi.2019.00049] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 02/19/2019] [Indexed: 12/12/2022] Open
Abstract
Misfolded proteins are pathological findings in some chronic neurodegenerative disorders including Alzheimer's, Parkinson's, and Huntington's diseases. Aging is a major risk factor for these disorders, suggesting that the mechanisms responsible for clearing misfolded proteins from the brain, the ubiquitin-proteasome system and the autophagy-lysosomal pathway, may decline with age. Although autophagic mechanisms have been found to decrease with age in many experimental models, whether they do so in the brain is unclear. This review examines the literature with regard to age-associated changes in macroautophagy and chaperone-mediated autophagy (CMA) in the central nervous system (CNS). Beclin 1, LC3-II, and the LC3-II/LC3-I ratio have frequently been used to examine changes in macroautophagic activity, while lamp2a and HSPA8 (also known as hsc70) have been used to measure CMA activity. Three gene expression analyses found evidence for an age-related downregulation of macroautophagy in human brain, but no published studies were found of age-related changes in CMA in human brain, although cerebrospinal fluid concentrations of HSPA8 were reported to decrease with age. Most studies of age-related changes in brain autophagy in experimental animals have found age-related declines in macroautophagy, and macroautophagy is necessary for normal lifespan in Caenorhabditis elegans, Drosophila, and mice. However, the few studies of age-related changes in brain CMA in experimental animals have produced conflicting results. Investigations of the influence of aging on macroautophagy in experimental animals in systems other than the CNS have generally found an age-related decrease in Beclin 1, but conflicting results for LC3-II and the LC3-II/LC3-I ratio, while CMA decreases with age in most models. CONCLUSION: while indirect evidence suggests that brain autophagy may decrease with normal aging, this issue has not been investigated sufficiently, particularly in human brain. Measuring autophagic activity in the brain can be challenging because of differences in basal autophagic activity between experimental models, and the inability to include lysosomal inhibitors when measuring the LC3-II/LC3-I ratio in postmortem specimens. If autophagy does decrease in the brain with aging, then pharmacological interventions and/or lifestyle alterations to slow this decline could reduce the risk of developing age-related neurodegenerative disorders.
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Affiliation(s)
- David A Loeffler
- Beaumont Research Institute, Department of Neurology, Beaumont Health, Royal Oak, MI, United States
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13
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Loeffler DA, Klaver AC, Coffey MP, Aasly JO. Cerebrospinal Fluid Concentration of Key Autophagy Protein Lamp2 Changes Little During Normal Aging. Front Aging Neurosci 2018; 10:130. [PMID: 29867441 PMCID: PMC5952035 DOI: 10.3389/fnagi.2018.00130] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 04/17/2018] [Indexed: 12/27/2022] Open
Abstract
Autophagy removes both functional and damaged intracellular macromolecules from cells via lysosomal degradation. Three autophagic mechanisms, namely macroautophagy, chaperone-mediated autophagy (CMA), and microautophagy, have been described in mammals. Studies in experimental systems have found macroautophagy and CMA to decrease with normal aging, despite the fact that oxidative stress, which can activate both processes, increases with normal aging. Whether autophagic mechanisms decrease in the human brain during normal aging is unclear. The primary objective of this study was to examine the association of a major autophagy protein, lysosome-associated membrane glycoprotein (lamp2), with age in cerebrospinal fluid (CSF) samples from healthy subjects. Lamp2 consists of three isoforms, lamp2a, 2b and 2c, all of which participate in autophagy. Lamp2's CSF concentration decreases in Parkinson's disease (PD) and increases in Alzheimer's disease (AD), but whether its CSF concentration changes during normal aging has not been investigated. Our secondary objectives were to examine the associations of lamp2's CSF concentration with CSF levels of the molecular chaperone heat shock 70-kDa protein (HSPA8), which interacts with lamp2a in CMA, and oxidative stress markers 8-hydroxy-2'-deoxyguanosine (8-OHdG), 8-isoprostane (8-ISO) and Total Antioxidant Capacity (TAC) in healthy subjects. We found lamp2's observed associations with these variables to be weak, with all Kendall's tau-b absolute values ≤0.20. These results suggest that CSF lamp2 concentration changes little during normal aging and does not appear to be associated with HSPA8 or oxidative stress. Further studies are indicated to determine the relationship between CSF lamp2 concentration and brain autophagic processes.
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Affiliation(s)
- David A Loeffler
- Department of Neurology, Beaumont Hospital-Royal Oak, Beaumont Health, Royal Oak, MI, United States
| | - Andrea C Klaver
- Department of Neurology, Beaumont Hospital-Royal Oak, Beaumont Health, Royal Oak, MI, United States
| | - Mary P Coffey
- Department of Biostatistics, Beaumont Hospital-Royal Oak, Beaumont Health, Royal Oak, MI, United States
| | - Jan O Aasly
- Department of Neurology, St. Olav's Hospital, Trondheim, Norway
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14
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Bingol B. Autophagy and lysosomal pathways in nervous system disorders. Mol Cell Neurosci 2018; 91:167-208. [PMID: 29729319 DOI: 10.1016/j.mcn.2018.04.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 04/26/2018] [Accepted: 04/28/2018] [Indexed: 12/12/2022] Open
Abstract
Autophagy is an evolutionarily conserved pathway for delivering cytoplasmic cargo to lysosomes for degradation. In its classically studied form, autophagy is a stress response induced by starvation to recycle building blocks for essential cellular processes. In addition, autophagy maintains basal cellular homeostasis by degrading endogenous substrates such as cytoplasmic proteins, protein aggregates, damaged organelles, as well as exogenous substrates such as bacteria and viruses. Given their important role in homeostasis, autophagy and lysosomal machinery are genetically linked to multiple human disorders such as chronic inflammatory diseases, cardiomyopathies, cancer, and neurodegenerative diseases. Multiple targets within the autophagy and lysosomal pathways offer therapeutic opportunities to benefit patients with these disorders. Here, I will summarize the mechanisms of autophagy pathways, the evidence supporting a pathogenic role for disturbed autophagy and lysosomal degradation in nervous system disorders, and the therapeutic potential of autophagy modulators in the clinic.
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Affiliation(s)
- Baris Bingol
- Genentech, Inc., Department of Neuroscience, 1 DNA Way, South San Francisco 94080, United States.
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