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Orellana AM, Mazucanti CH, Dos Anjos LP, de Sá Lima L, Kawamoto EM, Scavone C. Klotho increases antioxidant defenses in astrocytes and ubiquitin-proteasome activity in neurons. Sci Rep 2023; 13:15080. [PMID: 37699938 PMCID: PMC10497516 DOI: 10.1038/s41598-023-41166-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 08/23/2023] [Indexed: 09/14/2023] Open
Abstract
Klotho is an antiaging protein, and its levels decline with age and chronic stress. The exogenous administration of Klotho can enhance cognitive performance in mice and negatively modulate the Insulin/IGF1/PI3K/AKT pathway in terms of metabolism. In humans, insulin sensitivity is a hallmark of healthy longevity. Therefore, this study aimed to determine if exogenous Klotho, when added to neuronal and astrocytic cell cultures, could reduce the phosphorylation levels of certain insulin signaling effectors and enhance antioxidant strategies in these cells. Primary cell cultures of cortical astrocytes and neurons from mice were exposed to 1 nM Klotho for 24 h, with or without glucose. Klotho decreased pAKT and mTOR levels. However, in astrocytes, Klotho increased FOXO-3a activity and catalase levels, shielding them from intermediate oxidative stress. In neurons, Klotho did not alter FOXO-3 phosphorylation levels but increased proteasome activity, maintaining lower levels of PFKFB3. This study offers new insights into the roles of Klotho in regulating energy metabolism and the redox state in the brain.
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Affiliation(s)
- Ana Maria Orellana
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology, Institute of Biomedical Sciences ICB-1, University of São Paulo, Avenida Professor Lineu Prestes, 1524, São Paulo, São Paulo, 05508-900, Brazil
| | - Caio Henrique Mazucanti
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology, Institute of Biomedical Sciences ICB-1, University of São Paulo, Avenida Professor Lineu Prestes, 1524, São Paulo, São Paulo, 05508-900, Brazil
- Laboratory of Clinical Investigation, Diabetes Section, National Institute on Aging (NIH/NIA), Baltimore, MD, USA
| | - Leticia Pavan Dos Anjos
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology, Institute of Biomedical Sciences ICB-1, University of São Paulo, Avenida Professor Lineu Prestes, 1524, São Paulo, São Paulo, 05508-900, Brazil
| | - Larissa de Sá Lima
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology, Institute of Biomedical Sciences ICB-1, University of São Paulo, Avenida Professor Lineu Prestes, 1524, São Paulo, São Paulo, 05508-900, Brazil
| | - Elisa Mitiko Kawamoto
- Laboratory of Molecular and Functional Neurobiology, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
| | - Cristoforo Scavone
- Laboratory of Molecular Neuropharmacology, Department of Pharmacology, Institute of Biomedical Sciences ICB-1, University of São Paulo, Avenida Professor Lineu Prestes, 1524, São Paulo, São Paulo, 05508-900, Brazil.
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Bella YF, Oliveira CR, Mateus-Silva JR, Brandao-Rangel MAR, Silva-Reis A, Santos JDMB, Albertini R, Lopes-Martins RAB, de Oliveira LVF, Vieira RP. A phytotherapic blend immunity-6™ inhibits myeloid leukemic cells 2 activation involving purinergic signaling. Biomed Pharmacother 2023; 159:114263. [PMID: 36652732 DOI: 10.1016/j.biopha.2023.114263] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/04/2023] [Accepted: 01/14/2023] [Indexed: 01/17/2023] Open
Abstract
Leukemia is among the most common types of hematological cancers and the use of herbal medicines to prevent and treat leukemia are under quick development. Among several molecular pathways involved in leukemia pathogenesis and exacerbations, purinergic signaling is revealed as a key component. In the present study, the effects of two doses (5 ug/mL and 10 ug/mL) of Immunity-6™, a phytocomplex composed by beta-glucan, green tea (Camelia sinensis), chamomile (Matricaria chamomilla), and ascorbic acid (vitamin C) was tested in vitro, using chronic myelogenous leukemia cell line (K-562; 5 ×104/mL/well), which were challenged with lipopolysaccharide (LPS; 1 ug/mL) for 24 h. The results demonstrated that both doses of Immunity-6™ inhibited ATP release (p < 0.001) and P2×7 receptor at mRNA levels expression (p < 0.001). Purinergic inhibition by Immunity-6™ was followed by reduced release of proinflammatory cytokines IL-1beta (p < 0.001) and IL-6 (p < 0.001), while only 5 ug/mL of Immunity-6™ reduced the release of TNF-alpha (p < 0.001). Beyond to inhibit the release of pro-inflammatory cytokines, both doses of Immunity-6™ induced the release of anti-inflammatory cytokine IL-10 (p < 0.001), while only the higher dose (10 ug/mL) of Immunity-6™ induced the release of anti-inflammatory IL-1ra (p < 0.05) and klotho (p < 0.001). Thus, Immunity-6™ may be a promising adjuvant in the treatment of leukemia and further clinical trials are guaranteed.
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Affiliation(s)
- Yanesko Fernandes Bella
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil
| | - Carlos Rocha Oliveira
- Federal University of São Paulo (UNIFESP), Department of Biomedical Engineering, Rua Talim 330, São José dos Campos, SP 12231-280, Brazil
| | - José Roberto Mateus-Silva
- Federal University of São Paulo (UNIFESP), Department of Biomedical Engineering, Rua Talim 330, São José dos Campos, SP 12231-280, Brazil
| | - Maysa Alves Rodrigues Brandao-Rangel
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil
| | - Anamei Silva-Reis
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil
| | - Juliana de Melo Batista Santos
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil
| | - Regiane Albertini
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil
| | - Rodrigo Alvaro Brandao Lopes-Martins
- Unievangelica, Post-graduate Program in Human Movement and Rehabilitation and in Pharmaceutical Sciences, Avenida Universitária Km 3,5, Anápolis, GP 75083-515, Brazil
| | - Luis Vicente Franco de Oliveira
- Unievangelica, Post-graduate Program in Human Movement and Rehabilitation and in Pharmaceutical Sciences, Avenida Universitária Km 3,5, Anápolis, GP 75083-515, Brazil
| | - Rodolfo P Vieira
- Federal University of Sao Paulo (UNIFESP), Post-graduate Program in Sciences of Human Movement and Rehabilitation, Avenida Ana Costa 95, Santos- SP 11060-001, Brazil; Unievangelica, Post-graduate Program in Human Movement and Rehabilitation and in Pharmaceutical Sciences, Avenida Universitária Km 3,5, Anápolis, GP 75083-515, Brazil; Brazilian Institute of Teaching and Research in Pulmonary and Exercise Immunology, Rua Pedro Ernesto 240, São José dos Campos, SP 12245-520, Brazil; Universidade Brasil, Post-graduate Program in Bioengineering and Biomedical Engineering, Rua Carolina Fonseca 235, São Paulo, SP 08230-030, Brazil.
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3
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Klotho Ameliorates Vascular Calcification via Promoting Autophagy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:7192507. [PMID: 36338347 PMCID: PMC9629936 DOI: 10.1155/2022/7192507] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 09/01/2022] [Accepted: 09/07/2022] [Indexed: 02/05/2023]
Abstract
Vascular calcification (VC) is regarded as a common feature of vascular aging. Klotho deficiency reportedly contributes to VC, which can be ameliorated by restoration of Klotho expression. However, the specific mechanisms involved remain unclear. Here, we investigated the role of autophagy in the process of Klotho-inhibiting VC. The clinical study results indicated that, based on Agatston score, serum Klotho level was negatively associated with aortic calcification. Then, Klotho-deficient mice exhibited aortic VC, which could be alleviated with the supplementation of Klotho protein. Moreover, autophagy increased in the aorta of Klotho-deficient mice and protected against VC. Finally, we found that Klotho ameliorated calcification by promoting autophagy both in the aorta of Klotho-deficient mice and in mouse vascular smooth muscle cells (MOVAS) under calcifying conditions. These findings indicate that Klotho deficiency induces increased autophagy to protect against VC and that Klotho expression further enhances autophagy to ameliorate calcification. This study is beneficial to exploring the underlying mechanisms of Klotho regulating VC, which has important guiding significance for future clinical studies in the treatment of VC.
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The potential therapeutic effect of klotho on cell viability in human colorectal adenocarcinoma HT-29 cells. MEDICAL ONCOLOGY (NORTHWOOD, LONDON, ENGLAND) 2022; 39:191. [PMID: 36071274 DOI: 10.1007/s12032-022-01793-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 07/07/2022] [Indexed: 10/14/2022]
Abstract
Klotho is an anti-aging, anti-inflammator, and anti-oxidative protein and has been shown to important role in tumorigenesis, proliferation, survival, autophagy, and resistance to tumor suppressor effects in several types of human cancers. In this study, we aimed to investigate possible anti-tümör and apoptotic effects of exogen klotho in human colorectal adenocarcinoma cells (HT-29) and healthy colon cells (CCD 841 CoN). The WST-8 test was used to determine the half-maximum inhibitory concentration (IC50) of the klotho protein. AO-PI fluorescent staining techniques and Annexin V-PI flow cytometry was utilized to observe and detect the apoptosis of cancer cells induced by klotho. Our results demonstrated that klotho had a cytotoxic effect against colorectal adenocarcinoma cells in a dose-dependent manner. Our Annexin V-PI flow cytometric and AO-PI fluorescent analyses showed that klotho induced quantitative and morphological changes that indicate apoptotic induction in the human colorectal adenocarcinoma. This study results proved for the first time that klotho may be an effective potential therapeutic agent that may be used in adjuvant therapy in human colorectal adenocarcinoma it does not affect selectively healthy colon cells and but leading cancer cells to apoptosis.
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The role of α-klotho in human cancer: molecular and clinical aspects. Oncogene 2022; 41:4487-4497. [PMID: 36038662 DOI: 10.1038/s41388-022-02440-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 07/14/2022] [Accepted: 08/10/2022] [Indexed: 11/08/2022]
Abstract
Klotho is a well-established longevity hormone. Its most prominent function is the regulation of phosphate homeostasis. However, klotho possesses multiple pleiotropic activities, including inhibition of major signaling pathways, reducing oxidative stress and suppressing inflammation. These activities are tightly associated with cancer, and klotho was discovered as a universal tumor suppressor. We review here novel molecular aspects of klotho activity in cancer, focusing on its structure-function relationships and clinical aspects regarding its expression, blood levels, clinical risk, and prognostic value in the clinical setting. In addition, the potential benefit of klotho treatment combined with chemotherapy, biological therapy, or immunotherapy, are discussed. Finally, as klotho was shown in preclinical models to inhibit cancer development and growth, we discuss various approaches to developing klotho-based therapies.
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Borges BC, Do Amaral PA, Soldi LR, Costa Silva VL, Carvalho De Souza F, Cordeiro Da Luz FA, Agenor De Araújo R, Barbosa Silva MJ. Undetected αKlotho in serum is associated with the most aggressive phenotype of breast cancer. Mol Clin Oncol 2022; 16:93. [PMID: 35350405 PMCID: PMC8943645 DOI: 10.3892/mco.2022.2526] [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: 05/18/2021] [Accepted: 12/09/2021] [Indexed: 11/06/2022] Open
Abstract
Klotho, a cellular anti-senescence protein, is related to antitumor actions, growth regulation, proliferation and invasiveness in several types of tumor, including breast cancer. The present study aimed to analyze the serum levels of αKlotho in patients with breast cancer according to histopathological and immunohistochemical variables. A total of 74 patients and 60 healthy controls were recruited. Peripheral blood samples were collected and serum levels were assessed by sandwich ELISA. Clinical and diagnostic data were obtained from medical records and databases of the Clinical Hospital of the Federal University of Uberlândia (Uberlândia, Brazil). The results indicated no difference in the levels of αKlotho between patients and controls (P=0.068); however, the number of patients with breast cancer with undetectable αKlotho was high (n=52). Thus, the variables that were associated with the lowest survival rates were analyzed, relating them to undetectable αKlotho. Among cases of metastatic tumors or tumors with poor differentiation, positive lymph node status and triple-negative status, patients with undetectable αKlotho predominated and had unfavorable overall survival. Due to the significant results obtained in triple-negative patients, an in vitro analysis was performed to determine whether estrogen receptors (ERs) have a role in αKlotho production. Treatment of MCF-7 cells with ER agonists, estradiol (E2) and diarylpropionitrile (DPN), resulted in increases in αKlotho expression and supernatant levels of both agonists, demonstrating a direct association between the ER and Klotho production; of note, the ERβ-specific agonist DPN tripled αKlotho expression when compared to E2 (P=0.078). These data suggested that undetectable αKlotho in the serum of patients with breast cancer is related to unfavorable histopathological variables and poor prognosis and ERs possibly have an important role in maintaining adequate quantities of αKlotho.
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Affiliation(s)
- Bruna Cristina Borges
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
| | - Pedro Augusto Do Amaral
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
| | - Luiz Ricardo Soldi
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
| | - Victor Luigi Costa Silva
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
| | - Fernanda Carvalho De Souza
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
| | - Felipe Andrés Cordeiro Da Luz
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
- Núcleo de Prevenção, Pesquisa e Projeto de Câncer, Hospital do Câncer, Uberlândia, MG 38400-902, Brazil
| | - Rogério Agenor De Araújo
- Núcleo de Prevenção, Pesquisa e Projeto de Câncer, Hospital do Câncer, Uberlândia, MG 38400-902, Brazil
| | - Marcelo José Barbosa Silva
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, MG 38400-902, Brazil
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Investigation of the Role of Induced Overexpression of the Isolated Secreted Klotho on the A-172 Human Glioblastoma Cells. J Mol Neurosci 2022; 72:401-409. [PMID: 35112226 DOI: 10.1007/s12031-021-01960-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 12/19/2021] [Indexed: 10/19/2022]
Abstract
Klotho gene, identified in 1997 as an anti-aging gene, can manufacture two protein products: transmembrane and secreted forms. The later research revealed the involvement of klotho in carcinogenesis. However, little is known about the action of different Klotho forms on antitumor effects is still. The purpose of this article is to evaluate the effect of isolated secreted Klotho overexpression on the growth features of human glioblastoma cell line A-172.A-172 was transfected by a plasmid vector incorporating secreted Klotho sequence by the liposomal method. Overexpression assay was carried out quantitatively on both mRNA and protein using RT-qPCR and ELISA, correspondingly. It was shown that the relative expression of secreted Klotho in the experimental group was significantly higher than in the untransfected group by both methods (p < 0.001). At the same time, the growth curves and MTT proliferation assay demonstrated significantly decreased values under induced overexpression (p < 0.01). The increased amount of cells with activated caspases and annexin V (p < 0.001) corresponded with the expression of secreted Klotho. This mechanism, as suggested, maybe causative of the observed effects.
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Franco ML, Beyerstedt S, Rangel ÉB. Klotho and Mesenchymal Stem Cells: A Review on Cell and Gene Therapy for Chronic Kidney Disease and Acute Kidney Disease. Pharmaceutics 2021; 14:pharmaceutics14010011. [PMID: 35056905 PMCID: PMC8778857 DOI: 10.3390/pharmaceutics14010011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 02/07/2023] Open
Abstract
Chronic kidney disease (CKD) and acute kidney injury (AKI) are public health problems, and their prevalence rates have increased with the aging of the population. They are associated with the presence of comorbidities, in particular diabetes mellitus and hypertension, resulting in a high financial burden for the health system. Studies have indicated Klotho as a promising therapeutic approach for these conditions. Klotho reduces inflammation, oxidative stress and fibrosis and counter-regulates the renin-angiotensin-aldosterone system. In CKD and AKI, Klotho expression is downregulated from early stages and correlates with disease progression. Therefore, the restoration of its levels, through exogenous or endogenous pathways, has renoprotective effects. An important strategy for administering Klotho is through mesenchymal stem cells (MSCs). In summary, this review comprises in vitro and in vivo studies on the therapeutic potential of Klotho for the treatment of CKD and AKI through the administration of MSCs.
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Affiliation(s)
- Marcella Liciani Franco
- Albert Einstein Research and Education Institute, Hospital Israelita Albert Einstein, Sao Paulo 05652-900, Brazil; (M.L.F.); (S.B.)
| | - Stephany Beyerstedt
- Albert Einstein Research and Education Institute, Hospital Israelita Albert Einstein, Sao Paulo 05652-900, Brazil; (M.L.F.); (S.B.)
| | - Érika Bevilaqua Rangel
- Albert Einstein Research and Education Institute, Hospital Israelita Albert Einstein, Sao Paulo 05652-900, Brazil; (M.L.F.); (S.B.)
- Nephrology Division, Federal University of São Paulo, Sao Paulo 04038-901, Brazil
- Correspondence: ; Tel.: +55-11-2151-2148
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Zhou H, Pu S, Zhou H, Guo Y. Klotho as Potential Autophagy Regulator and Therapeutic Target. Front Pharmacol 2021; 12:755366. [PMID: 34737707 PMCID: PMC8560683 DOI: 10.3389/fphar.2021.755366] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 10/07/2021] [Indexed: 12/22/2022] Open
Abstract
The protein Klotho can significantly delay aging, so it has attracted widespread attention. Abnormal downregulation of Klotho has been detected in several aging-related diseases, such as Alzheimer’s disease, kidney injury, cancer, chronic obstructive pulmonary disease (COPD), vascular disease, muscular dystrophy and diabetes. Conversely, many exogenous and endogenous factors, several drugs, lifestyle changes and genetic manipulations were reported to exert therapeutic effects through increasing Klotho expression. In recent years, Klotho has been identified as a potential autophagy regulator. How Klotho may contribute to reversing the effects of aging and disease became clearer when it was linked to autophagy, the process in which eukaryotic cells clear away dysfunctional proteins and damaged organelles: the abovementioned diseases involve abnormal autophagy. Interestingly, growing evidence indicates that Klotho plays a dual role as inducer or inhibitor of autophagy in different physiological or pathological conditions through its influence on IGF-1/PI3K/Akt/mTOR signaling pathway, Beclin 1 expression and activity, as well as aldosterone level, which can help restore autophagy to beneficial levels. The present review examines the role of Klotho in regulating autophagy in Alzheimer’s disease, kidney injury, cancer, COPD, vascular disease, muscular dystrophy and diabetes. Targeting Klotho may provide a new perspective for preventing and treating aging-related diseases.
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Affiliation(s)
- Hongjing Zhou
- Department of Pharmacy, Chengdu Fifth People's Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Shiyun Pu
- Department of Pharmacy, Chengdu Fifth People's Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Houfeng Zhou
- Department of Pharmacy, Chengdu Fifth People's Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yuanxin Guo
- Department of Pharmacy, Chengdu Fifth People's Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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Enhancement of Apo2L/TRAIL signaling pathway receptors by the activation of Klotho gene with CRISPR/Cas9 in Caco-2 colon cancer cells. Med Oncol 2021; 38:146. [PMID: 34687379 DOI: 10.1007/s12032-021-01595-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 09/29/2021] [Indexed: 12/13/2022]
Abstract
Human Klotho gene has many known functions such as anti-aging and anti-tumor, and decreased expression of this gene causes malignant formations in most types of cancer, including colon cancer. Interacting with TRAIL death receptors (DR4 and DR5) induces an apoptotic effect in cancer treatments by reducing the proliferation of cancer cells. The present study aimed to investigate downstream effect of overexpression of Klotho gene, which is known to have an antitumor effect on resistant human colon cancer cells, by examining its action on TRAIL death and decoy (DcR1 and DcR2) receptors for the first time. For this purpose, upregulation of human Klotho gene was achieved with CRISPR/Cas9-mediated system in resistant human colon cancer Caco-2 cells. To determine the effect of upregulation of Klotho gene on cancer cells evaluations with flow cytometry, WST-8, qRT-PCR, ELISA, and immunohistochemical analysis were performed. Then, Klotho gene was knocked out and its apoptotic effect was tested to find out whether it is due to overexpression of Klotho gene or not. Our results indicate that overexpression of Klotho gene in Caco-2 cells via CRISPR/Cas9-sensitized TRAIL death receptor DR4 suppresses the proliferation of cells by leading to apoptosis. Thus, this study conducted on apoptosis-resistant colon cancer cells may bring new insights about the role of Klotho gene in colon cancer.
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Ewendt F, Feger M, Föller M. Role of Fibroblast Growth Factor 23 (FGF23) and αKlotho in Cancer. Front Cell Dev Biol 2021; 8:601006. [PMID: 33520985 PMCID: PMC7841205 DOI: 10.3389/fcell.2020.601006] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 10/15/2020] [Indexed: 12/16/2022] Open
Abstract
Together with fibroblast growth factors (FGFs) 19 and 21, FGF23 is an endocrine member of the family of FGFs. Mainly secreted by bone cells, FGF23 acts as a hormone on the kidney, stimulating phosphate excretion and suppressing formation of 1,25(OH)2D3, active vitamin D. These effects are dependent on transmembrane protein αKlotho, which enhances the binding affinity of FGF23 for FGF receptors (FGFR). Locally produced FGF23 in other tissues including liver or heart exerts further paracrine effects without involvement of αKlotho. Soluble Klotho (sKL) is an endocrine factor that is cleaved off of transmembrane Klotho or generated by alternative splicing and regulates membrane channels, transporters, and intracellular signaling including insulin growth factor 1 (IGF-1) and Wnt pathways, signaling cascades highly relevant for tumor progression. In mice, lack of FGF23 or αKlotho results in derangement of phosphate metabolism and a syndrome of rapid aging with abnormalities affecting most organs and a very short life span. Conversely, overexpression of anti-aging factor αKlotho results in a profound elongation of life span. Accumulating evidence suggests a major role of αKlotho as a tumor suppressor, at least in part by inhibiting IGF-1 and Wnt/β-catenin signaling. Hence, in many malignancies, higher αKlotho expression or activity is associated with a more favorable outcome. Moreover, also FGF23 and phosphate have been revealed to be factors relevant in cancer. FGF23 is particularly significant for those forms of cancer primarily affecting bone (e.g., multiple myeloma) or characterized by bone metastasis. This review summarizes the current knowledge of the significance of FGF23 and αKlotho for tumor cell signaling, biology, and clinically relevant parameters in different forms of cancer.
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Affiliation(s)
- Franz Ewendt
- Department of Nutritional Physiology, Institute of Agricultural and Nutritional Sciences, Martin-Luther University Halle-Wittenberg, Halle, Germany
| | - Martina Feger
- Department of Physiology, University of Hohenheim, Stuttgart, Germany
| | - Michael Föller
- Department of Physiology, University of Hohenheim, Stuttgart, Germany
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Sphingomyelinases and Liver Diseases. Biomolecules 2020; 10:biom10111497. [PMID: 33143193 PMCID: PMC7692672 DOI: 10.3390/biom10111497] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 02/06/2023] Open
Abstract
Sphingolipids (SLs) are critical components of membrane bilayers that play a crucial role in their physico-chemical properties. Ceramide is the prototype and most studied SL due to its role as a second messenger in the regulation of multiple signaling pathways and cellular processes. Ceramide is a heterogeneous lipid entity determined by the length of the fatty acyl chain linked to its carbon backbone sphingosine, which can be generated either by de novo synthesis from serine and palmitoyl-CoA in the endoplasmic reticulum or via sphingomyelin (SM) hydrolysis by sphingomyelinases (SMases). Unlike de novo synthesis, SMase-induced SM hydrolysis represents a rapid and transient mechanism of ceramide generation in specific intracellular sites that accounts for the diverse biological effects of ceramide. Several SMases have been described at the molecular level, which exhibit different pH requirements for activity: neutral, acid or alkaline. Among the SMases, the neutral (NSMase) and acid (ASMase) are the best characterized for their contribution to signaling pathways and role in diverse pathologies, including liver diseases. As part of a Special Issue (Phospholipases: From Structure to Biological Function), the present invited review summarizes the physiological functions of NSMase and ASMase and their role in chronic and metabolic liver diseases, of which the most relevant is nonalcoholic steatohepatitis and its progression to hepatocellular carcinoma, due to the association with the obesity and type 2 diabetes epidemic. A better understanding of the regulation and role of SMases in liver pathology may offer the opportunity for novel treatments of liver diseases.
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Klotho Exerts an Emerging Role in Cytokinesis. Genes (Basel) 2020; 11:genes11091048. [PMID: 32899868 PMCID: PMC7565453 DOI: 10.3390/genes11091048] [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: 08/19/2020] [Revised: 08/31/2020] [Accepted: 09/01/2020] [Indexed: 11/23/2022] Open
Abstract
The Klotho gene functions as an anti-aging gene. A previous klotho-knockout mice study indicated that neither male nor female gametocytes could accomplish the first meiotic division. It suggested that Klotho might regulate cell division. In this study, we determined the roles of Klotho in cytokinesis in cultural human cells (HEK293 and HeLa) and in zebrafish embryos. Immunoprecipitation, mass spectrometry analysis, and a zebrafish model were used in this study. The results showed that Klotho is located in the midbody, which correlated with cytokinesis related kinases, Aurora kinase B and citron kinases, in the late stage of cytokinesis. There was a spatial correlation between the abscission site and the location of Klotho in the cytokinesis bridge. A three-dimensional structural reconstruction study demonstrated there was a spatial correlation among Klotho, Aurora kinase B, and citron kinases in the midbody. In addition, Klotho depletion inactivated Aurora kinases; it was also indicated that Klotho depletion caused aberrant cell cycle and delayed cytokinesis in a cell model. The study with zebrafish embryos suggested that klotho knockdown caused early embryo development abnormality due to dysregulated cytokinesis. In conclusion, Klotho might have a critical role in cytokinesis regulation by interacting with the cytokinesis related kinases.
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14
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Kamal A, Salama M, Kamal A, Mohsen A, Siam I. Klotho (rs1207568 and rs564481) gene variants and colorectal cancer risk. TURKISH JOURNAL OF GASTROENTEROLOGY 2020; 31:497-502. [PMID: 32897222 DOI: 10.5152/tjg.2020.19235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND/AIMS Whereas colorectal cancer (CRC) is the third most common cancer worldwide, klotho gene has been reported as a tumor suppressor gene. Therefore, the aim of this study was to investigate the association between klotho (rs1207568 and rs564481) variants and CRC in Egyptian patients. MATERIALS AND METHODS A case-control study comprising 100 patients with CRC and 100 age- and sex-matched healthy controls was conducted. Genotyping of klotho was performed by polymerase chain reaction with confronting two-pair primers. RESULTS The frequencies of the A allele of rs1207568 and the AC haplotype were significantly higher in patients with CRC than in the controls (p=0.019 and p=0.005, respectively). CONCLUSION We propose that klotho (rs1207568 and rs564481) variants play a significant role in colorectal carcinogenesis and that the klotho protein could be a target for oncotherapy.
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Affiliation(s)
- Asmaa Kamal
- Department of Clinical - Chemical Pathology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Mohamed Salama
- Department of Surgical Oncology, National Cancer Institute, Cairo Univeristy, Cairo, Egypt
| | - Amr Kamal
- Department of Surgical Oncology, National Cancer Institute, Cairo Univeristy, Cairo, Egypt
| | - Ahmed Mohsen
- General Surgery Researcher, National Research Centre, Cairo, Egypt
| | - Ibrahem Siam
- Department of Internal Medicine, National Research Centre, Cairo, Egypt
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15
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Yang L, Wu Y, He H, Hu F, Li M, Mo L, Xiao Y, Wang X, Xie B. Delivery of BR2‐SOX17 fusion protein can inhibit cell survival, proliferation, and invasion in gastric cancer cells through regulating Klotho gene expression. Cell Biol Int 2020; 44:2011-2020. [PMID: 32544287 DOI: 10.1002/cbin.11407] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 05/30/2020] [Accepted: 06/13/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Lixia Yang
- Department of Cancer The First Affiliated Hospital of Changsha Medical School Changsha Hunan China
| | - Yue Wu
- Department of Cancer The First Affiliated Hospital of Changsha Medical School Changsha Hunan China
| | - Heli He
- Department of Cancer The First Affiliated Hospital of Changsha Medical School Changsha Hunan China
| | - Fan Hu
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
| | - Mei Li
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
| | - Li Mo
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
| | - You Xiao
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
| | - Xiaoyan Wang
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
| | - Biao Xie
- Department of Cancer The First Affiliated Hospital of Changsha Medical School Changsha Hunan China
- Department One of Anorectal Surgery The Second Affiliated Hospital of Hunan University of Chinese Medicine Changsha Hunan China
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16
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Xie B, Hu F, Li M, Mo L, Xu C, Xiao Y, Wang X, Nie J, Yang L, He Y. FLI-1 mediates tumor suppressor function via Klotho signaling in regulating CRC. Cell Biol Int 2020; 44:1514-1522. [PMID: 32196848 DOI: 10.1002/cbin.11347] [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: 10/21/2019] [Revised: 03/11/2020] [Accepted: 03/19/2020] [Indexed: 12/24/2022]
Abstract
Colorectal cancer (CRC) is an aggressive malignancy with a high incidence and mortality rate. Although a targeting therapy has been developed, the 5-year survival rate is still very low in CRC patients with distant metastasis. Thus, the identification of new targets is still significant for improving CRC treatment. Klotho is a tumor suppressor, and its expression is aberrant in CRC. In this study, the roles of the FLI-1 gene in regulating Klotho gene expression and Klotho-associated signaling, as well as the effects of FLI-1 on colony formation, invasion, and apoptosis were investigated in CRC cell lines. The methylation of the FLI-1 gene was analyzed using a commercial methylation kit. Results showed that FLI-1 messenger RNA and protein expression were downregulated in six CRC cell lines when compared with the normal colon mucosal epithelial cell line, which negatively correlated with the level of DNA methylation. Silencing of FLI-1 gene expression decreased Klotho protein expression and phosphorylation of β-catenin protein at Thr41 /Ser45 , but increased Wnt3a and β-catenin protein expression and IGF-1R phosphorylation in HT29 cells. In contrast to silencing FLI-1, overexpressing FLI-1 significantly increased Klotho protein expression and phosphorylation of β-catenin protein at Thr41 /Ser45 , but decreased Wnt3a and β-catenin protein expression and IGF-1R phosphorylation in Caco-2 cells. Silencing of FLI-1 gene expression significantly increased colony formation and invasion, but decreased apoptosis in HT29 cells. In contrast, overexpressing the FLI-1 gene significantly decreased colony formation and invasion, but increased apoptosis in Caco-2 cells. These findings suggest that FLI-1 functions as a tumor suppressor in CRC cells and positively regulates Klotho signaling. Hypermethylation may be one of the causes of the loss of FLI-1 gene expression in CRC cells.
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Affiliation(s)
- Biao Xie
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Fan Hu
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Mei Li
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Li Mo
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Chongsi Xu
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - You Xiao
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Xiaoyan Wang
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
| | - Jing Nie
- Hunan Slack King Laboratory Animal Co., Ltd., Changsha, 410125, Hunan, China
| | - Lixia Yang
- Department of Cancer, The First Affiliated Hospital of Changsha Medical School, Changsha, 410219, Hunan, China
| | - Yongheng He
- Department One of Anorectal Surgery, The Second Affiliated Hospital of Hunan University of Chinese Medicine, Changsha, 410005, Hunan, China
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17
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Omede F, Zhang S, Johnson C, Daniel E, Zhang Y, Fields TA, Boulanger J, Liu S, Ahmed I, Umar S, Wallace DP, Stubbs JR. Dietary phosphate restriction attenuates polycystic kidney disease in mice. Am J Physiol Renal Physiol 2020; 318:F35-F42. [DOI: 10.1152/ajprenal.00282.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Studies in rodents with reduced nephron mass have suggested a strong positive correlation between dietary phosphate consumption and CKD progression. Prior work by our group demonstrated that dietary phosphate restriction can prevent tubular injury and microcyst formation in rodents with glomerulonephritis. Tubular injury and cystic dilation of tubules are key contributors to kidney function decline in polycystic kidney disease (PKD). Here, we determined whether dietary phosphate restriction slows renal cyst growth and fibrosis in a mouse model of PKD. Pcy/pcy mice received a normal phosphate (0.54%) or a phosphate-restricted (0.02%) diet ( n = 10/group) from 7 to 20 wk of age. All of the other major dietary constituents, including protein source and content, were comparable between the two diets. At 20 wk, body weight, kidney weight-to-body weight ratio (KW/BW), cystic area, cyst number, and kidney fibrosis were quantified. Pcy/pcy mice fed a phosphate-restricted diet had lower serum phosphate, fibroblast growth factor 23, and parathyroid hormone levels, along with elevated serum calcium levels and increased kidney Klotho gene expression compared with mice that consumed the control diet. Dietary phosphate restriction resulted in a 25% lower KW/BW ratio and reduced the cyst number, cystic index, and gene expression for the tubular injury markers neutrophil gelatinase-associated lipocalin and interleukin-18. Mice fed the phosphate-restricted diet exhibited lower kidney expression for pathways involved in collagen deposition and myofibroblast activation (collagen type I-α1, phosphorylated SMAD3, and α-smooth muscle actin); however, histological differences in kidney fibrosis were not appreciated. Dietary phosphate restriction slows cystogenesis and inhibits the activation of key pathways in the generation of kidney fibrosis in PKD mice.
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Affiliation(s)
- Faith Omede
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Shiqin Zhang
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Cassandra Johnson
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Emily Daniel
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Yan Zhang
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Timothy A. Fields
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
- Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, Kansas
| | | | | | - Ishfaq Ahmed
- Department of Surgery, University of Kansas Medical Center, Kansas City, Kansas
| | - Shahid Umar
- Department of Surgery, University of Kansas Medical Center, Kansas City, Kansas
| | - Darren Paul Wallace
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, Kansas
| | - Jason R. Stubbs
- The Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, Kansas
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18
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Rao Z, Zheng L, Huang H, Feng Y, Shi R. α-Klotho Expression in Mouse Tissues Following Acute Exhaustive Exercise. Front Physiol 2019; 10:1498. [PMID: 31920703 PMCID: PMC6919267 DOI: 10.3389/fphys.2019.01498] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/25/2019] [Indexed: 12/22/2022] Open
Abstract
α-Klotho, a multifunctional protein, has been demonstrated to protect tissues from injury via anti-oxidation and anti-inflammatory effects. The expression of α-klotho is regulated by several physiological and pathological factors, including acute inflammatory stress, oxidative stress, hypertension, and chronic renal failure. Exhaustive exercise has been reported to result in tissue damage, which is induced by inflammation, oxidative stress, and energy metabolism disturbance. However, little is known about the effects of exhaustive exercise on the expression of α-klotho in various tissues. To determine the effects, the treadmill exhaustion test in mice was performed and the mice were sacrificed at different time points following exhaustive exercise. Our results confirmed that the full-length (130 kDa) and shorter-form (65 kDa) α-klotho were primarily expressed in the kidneys. Moreover, we found that, except for the kidneys and brain, other tissues primarily expressed the shorter-form α-klotho, including liver, which was in contrast to previous reports. Furthermore, the shorter-form α-klotho was decreased immediately following the acute exhaustive exercise and was then restored to the pre-exercise level or even higher levels in the next few days. Our results indicate that α-klotho may play a key role in the body exhaustion and recovery following exhaustive exercise.
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Affiliation(s)
- Zhijian Rao
- College of Physical Education, Shanghai Normal University, Shanghai, China.,School of Kinesiology, Shanghai University of Sport, Shanghai, China.,Department of Kinesiology and Physiology, East Carolina University, Greenville, NC, United States
| | - Lifang Zheng
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | - Hu Huang
- Department of Kinesiology and Physiology, East Carolina University, Greenville, NC, United States
| | - Yu Feng
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | - Rengfei Shi
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
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19
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Su J, Ma Q, Long W, Tang H, Wu C, Luo M, Wang X, Xiao K, Li Y, Xiao Q, Zhang C, Li H, Liu Q. LCTL Is a Prognostic Biomarker and Correlates With Stromal and Immune Infiltration in Gliomas. Front Oncol 2019; 9:1083. [PMID: 31681612 PMCID: PMC6803540 DOI: 10.3389/fonc.2019.01083] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/01/2019] [Indexed: 01/08/2023] Open
Abstract
Immune evasion in glioma strongly correlates with clinical outcomes; however, the molecular mechanisms driving the maintenance of immunosuppression remain largely unknown. Recently studies demonstrate that Klothos are aberrantly expressed in several cancers and are potential therapeutic targets in cancers. However, their roles are still unclear in glioma. Here, we show that LCTL is highly expressed in gliomas and that its expression is regulated by DNA methylation status at the promoter. LCTL expression is also found to be significantly associated with high tumor aggressiveness and poor outcomes for glioma patients. Mechanistically, results suggested that LCTL might play an important immunosuppressive role by recruiting immunosuppressive cells and regulating tumor-associated macrophages polarization, T cell exhaustion, and epithelial–mesenchymal transition through FGF signaling in glioma. Our results establish LCTL as a key biomarker for prognosis that could be considered a potential epigenetic and immunotherapeutic target for treatment.
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Affiliation(s)
- Jun Su
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Qianquan Ma
- Department of Neurosurgery, Peking University Third Hospital, Peking University, Beijing, China
| | - Wenyong Long
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Hailin Tang
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Changwu Wu
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Mei Luo
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Xiangyu Wang
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Kai Xiao
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Yang Li
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Qun Xiao
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Chi Zhang
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Haoyu Li
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China
| | - Qing Liu
- Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China.,Institute of Skull Base Surgery & Neuro-oncology at Hunan, Changsha, China
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20
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Peshes-Yeloz N, Ungar L, Wohl A, Jacoby E, Fisher T, Leitner M, Nass D, Rubinek T, Wolf I, Cohen ZR. Role of Klotho Protein in Tumor Genesis, Cancer Progression, and Prognosis in Patients with High-Grade Glioma. World Neurosurg 2019; 130:e324-e332. [PMID: 31228703 DOI: 10.1016/j.wneu.2019.06.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 06/10/2019] [Accepted: 06/11/2019] [Indexed: 01/31/2023]
Abstract
BACKGROUND Klotho, a single-pass transmembrane protein associated with premature aging, acts as a tumor suppressor gene by inhibiting insulin/insulin-like growth factor-1 and fibroblast growth factor pathways. Downregulated Klotho expression is reported in melanoma, mesothelioma, bladder, breast, gastric, cervix, lung, and kidney cancers and is associated with a poor prognosis. Klotho expression and Klotho promoter hypermethylation are predictive factors for patient prognosis. METHODS To investigate the potential role of Klotho in glioblastoma-multiforme (GBM), 22 GBM samples were collected from the Sheba Tumor Bank and examined. RESULTS We found that increased Klotho messenger ribonucleic acid (RNA) expression predicted longer survival (P = 0.03) of GBM patients. Methylation analysis was performed on bisulfite-treated deoxyribonucleic acid from the GBM patient samples using ionization time-of-flight mass spectrometry according to the Sequenom EpiTYPER protocols. Klotho promoter hypermethylation was detected in 65% of the GBM samples and correlated significantly with improved survival (P < 0.04). We found 3 major Klotho promotor hypermethylation sites located 585-579 bp, 540-533 bp, and 537-534 bp upstream of the transcription start site. Methylated deoxyribonucleic acid immunoprecipitation studies confirmed these results. Notably, the messenger RNA expression in these GBM samples revealed an unexpected linear correlation with methylation of these 3 hypermethylation sites identified in the Klotho promotor. Thus Klotho expression and methylation could predict prognosis in patients with GBM. CONCLUSIONS Epigenetic regulation in GBM appears to be complicated. Specific CpG islands affect genes or micro RNAs that interact to control Klotho expression. The diverse effects of these islands may be due to unique factors of GBM.
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Affiliation(s)
- Naama Peshes-Yeloz
- Department of Neurosurgery, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Lior Ungar
- Department of Neurosurgery, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Anton Wohl
- Department of Neurosurgery, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Elad Jacoby
- Cancer Research Center, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Tamar Fisher
- Cancer Research Center, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Moshe Leitner
- Cancer Research Center, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Dvora Nass
- Institute of Pathology, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Tamar Rubinek
- Institute of Oncology, Tel-Aviv Medical Center, Tel-Aviv; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Ido Wolf
- Institute of Oncology, Tel-Aviv Medical Center, Tel-Aviv; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Zvi R Cohen
- Department of Neurosurgery, Sheba Medical Center, Ramat Gan; Affiliated with the Sackler School of Medicine, Tel Aviv, Israel.
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21
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Abolghasemi M, Yousefi T, Maniati M, Qujeq D. The interplay of Klotho with signaling pathway and microRNAs in cancers. J Cell Biochem 2019; 120:14306-14317. [DOI: 10.1002/jcb.29022] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 04/16/2019] [Accepted: 04/18/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Maryam Abolghasemi
- Cellular and Molecular Biology Research Center, Health Research Institute Babol University of Medical Sciences Babol Iran
- Department of Clinical Biochemistry, School of Medicine Babol University of Medical Sciences Babol Iran
- Student Research Committee Babol University of Medical Sciences Babol Iran
| | - Tooba Yousefi
- Cellular and Molecular Biology Research Center, Health Research Institute Babol University of Medical Sciences Babol Iran
- Department of Clinical Biochemistry, School of Medicine Babol University of Medical Sciences Babol Iran
- Student Research Committee Babol University of Medical Sciences Babol Iran
| | - Mahmood Maniati
- Assistant Professor of the English Department Ahvaz Jundishapur University of Medical Sciences Ahvaz Iran
| | - Durdi Qujeq
- Cellular and Molecular Biology Research Center, Health Research Institute Babol University of Medical Sciences Babol Iran
- Department of Clinical Biochemistry, School of Medicine Babol University of Medical Sciences Babol Iran
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22
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Zhu Y, Cao X, Zhang X, Chen Q, Wen L, Wang P. DNA methylation-mediated Klotho silencing is an independent prognostic biomarker of head and neck squamous carcinoma. Cancer Manag Res 2019; 11:1383-1390. [PMID: 30863149 PMCID: PMC6388988 DOI: 10.2147/cmar.s188415] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Purpose To study the prognostic value of klotho (KL) and its promoter DNA methylation in head and neck squamous cell carcinoma (HNSCC) and to assess their associations with the autophagy gene LC3 and the RNA transferase gene NSUN2. Materials and methods Upper quartile normalized RNA-seq V2 RSEM values of KL mRNA and beta value for KL methylation were retrieved from The Cancer Genome Atlas HNSCC dataset. Kaplan–Meier survival curves were used to assess the associations of KL expression and methylation with patient survival; multivariate Cox proportional hazards regression models were used to estimate the HRs and their 95% CIs. Results There is a negative relationship between KL gene expression and its promoter DNA methylation in HNSCC. KL gene expression was positively correlated with overall survival, while KL methylation was inversely correlated with the overall survival of HNSCC patients. Furthermore, KL methylation was significantly associated with gender (P=0.012), tumor grade (P=0.0009) and tumor site (P<0.0001). Finally, HNSCC patients with high KL gene expression or low KL DNA methylation had high LC3 but low NSUN2. Conclusion KL methylation silenced its gene expression in HNSCC. Low KL expression and high KL methylation can be potential biomarkers for worse prognosis in HNSCC. As the downstream targets, LC3 and NSUN2 could be responsible for the KL expression in HNSCC.
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Affiliation(s)
- Yun Zhu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | - Xuehong Cao
- Department of Traditional Chinese Medicine, Medical College, Xiamen University, Xiamen, Fujian Province 361102, China
| | - Xiaomeng Zhang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | - Quan Chen
- Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China
| | - Lei Wen
- Department of Traditional Chinese Medicine, Medical College, Xiamen University, Xiamen, Fujian Province 361102, China
| | - Ping Wang
- Department of Pediatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China,
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23
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Zhu Z, Xia W, Cui Y, Zeng F, Li Y, Yang Z, Hequn C. Klotho gene polymorphisms are associated with healthy aging and longevity: Evidence from a meta-analysis. Mech Ageing Dev 2019; 178:33-40. [PMID: 30633899 DOI: 10.1016/j.mad.2018.12.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/10/2018] [Accepted: 12/30/2018] [Indexed: 01/11/2023]
Abstract
Klotho gene polymorphisms have been implicated in healthy aging, but inconsistences in findings from previous case-control studies have raised concerns regarding the associations between KLOTHO gene polymorphisms and susceptibility to aging-related diseases and longevity. Hence, this meta-analysis was performed. We assessed the associations between two polymorphisms (G-395 A/rs1207568 and F352 V/rs9536314) and five parameters (urolithiasis, cognitive impairment, cardiovascular disease, cancer, and longevity) by calculating pooled odds ratios with 95% confidence intervals. According to the pooled results, the G allele of the G-395 A polymorphism conferred a significantly higher risk of urolithiasis; G-395 A was related to the susceptibility to cardiovascular disease under allele, dominant, and recessive models. There was no significant association between the G-395 A polymorphism and cognitive impairment among the elderly. The F allele of the F352 V polymorphism protected against breast and ovarian cancer susceptibility. Interestingly, based on the results of the subgroup analysis, the F352 V polymorphism was associated with the overall risk of neoplasms in BRCA1 mutation carriers but not in BRCA2 mutation carriers. Moreover, the F allele played a protective role in determining human longevity. In conclusion, Klotho G-395 A polymorphisms were associated with urolithiasis and cardiovascular disease but not with cognitive impairment. Additionally, Klotho F352 V polymorphisms were associated with cancers and longevity.
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Affiliation(s)
- Zewu Zhu
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Weiping Xia
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Yu Cui
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Feng Zeng
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Yang Li
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Zhongqing Yang
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Chen Hequn
- Department of Urology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
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24
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The Involvement of NF-κB/Klotho Signaling in Colorectal Cancer Cell Survival and Invasion. Pathol Oncol Res 2019; 25:1553-1565. [PMID: 30612312 DOI: 10.1007/s12253-018-0493-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 10/10/2018] [Indexed: 12/22/2022]
Abstract
Lipopolysaccharide significantly increased invasion, cell proliferation, and phospho-NF-κB p65 and phospho-IGF-1R protein, but decreased klotho protein expression, cell apoptosis, and the percentage of sub G0/G1 cells in SW480 and HT29 colorectal cancer cells. In contrast, NF-κB inhibitor exhibited a counteract effect of lipopolysaccharide. Transfection of Toll-like receptor 4 shRNA significantly decreased phospho-NF-κB p65 and phospho-IGF-1R protein levels, invasion, but significantly increased klotho protein expression, cell apoptosis, and the percentage of sub G0/G1 in SW480 and HT29 cells. In conclusion, inflammation inhibits klotho gene expression in colorectal cancer cells through activation of Toll-like receptor 4 /NF-κB signal pathway.
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25
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Ning Y, Shi Y, Chen J, Song N, Cai J, Fang Y, Yu X, Ji J, Ding X. Necrostatin-1 Attenuates Cisplatin-Induced Nephrotoxicity Through Suppression of Apoptosis and Oxidative Stress and Retains Klotho Expression. Front Pharmacol 2018; 9:384. [PMID: 29725301 PMCID: PMC5917042 DOI: 10.3389/fphar.2018.00384] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 04/04/2018] [Indexed: 01/16/2023] Open
Abstract
Aim: Cisplatin is an effective chemotherapeutic drug, but the application in clinical is greatly limited by its nephrotoxicity. Necrostatin-1 (Nec-1), an inhibitor of RIP1 kinase, has been reported to inhibit RIP-mediated necroptosis. The aim of this study is to detect the protective effects of Nec-1 on the nephrotoxicity of cisplatin and to investigate its renoprotection mechanism. Methods: 8-week-old male C57BL/6 mice were randomly assigned into four groups: Control, Nec-1, Cisplatin, and Cisplatin+Nec-1. Mice were treated with cisplatin with or without Nec-1 pre-treatment. Renal function, histological changes, necroptosis, and apoptotic markers were investigated. NFκB pathway related proteins, proinflammatory cytokines, oxidative stress markers, renal Klotho, and autophagy-related proteins levels were also examined. Results: Renal function and histological data displayed that the treatment with Nec-1 significantly attenuates cisplatin-induced renal damage. The expression of RIPK1/RIPK3/MLKL were significantly enhanced in cisplatin group as compared to the control group (p < 0.05) and was significantly reduced by pre-treatment of Nec-1 (p < 0.05). The level of stress and apoptosis-related protein, including p-JNK, p-c-Jun, p-p38, Bax/Bcl-2 ratio, and caspase-3 showed the similar trend. Pre-treatment with Nec-1 inhibit NFκB signaling, reduced proinflammatory cytokines and oxidative stress, up-regulated renal Klotho, and autophagy-related proteins levels. Conclusion: Our results suggest that Nec-1 could be a potential therapeutic drug against the cisplatin-induced nephrotoxicity through its anti-necroptosis, anti-apoptotic, anti-inflammatory anti-oxidant and retain Klotho expression and activate autophagy effects in the kidney.
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Affiliation(s)
- Yichun Ning
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China.,Shanghai Institute of Kidney and Dialysis, Shanghai, China
| | - Yiqin Shi
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China
| | - Jing Chen
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China
| | - Nana Song
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China
| | - Jieru Cai
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China
| | - Yi Fang
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China.,Shanghai Institute of Kidney and Dialysis, Shanghai, China
| | - Xiaofang Yu
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China.,Shanghai Institute of Kidney and Dialysis, Shanghai, China
| | - Jun Ji
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Institute of Kidney and Dialysis, Shanghai, China
| | - Xiaoqiang Ding
- Department of Nephrology, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Medical Center for Kidney, Shanghai, China.,Shanghai Key Laboratory of Kidney and Blood Purification, Shanghai, China.,Shanghai Institute of Kidney and Dialysis, Shanghai, China
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Xie B, Cao K, Li J, Chen J, Tang J, Chen X, Xia K, Zhou X, Cheng Y, Zhou J, Xie H. Hmgb1 inhibits Klotho expression and malignant phenotype in melanoma cells by activating NF-κB. Oncotarget 2018; 7:80765-80782. [PMID: 27779100 PMCID: PMC5348353 DOI: 10.18632/oncotarget.12623] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 09/26/2016] [Indexed: 12/26/2022] Open
Abstract
The molecular and cellular mechanisms behind the involvement of inflammation in melanoma have not been fully elucidated. In this study, knockdown of Hmgb1 expression increased apoptosis, reduced invasion and p-NF-κB expression, but increased Klotho protein level in melanoma tumor cells. The effect of Hmgb1 knockdown was overcome by LPS. Introduction of exogenous Hmgb1 significantly decreased apoptosis, increased invasion, elevated p-NF-κB, but lowered Klotho protein level in melanoma cells. The effect of exogenous Hmgb1 was agonized by NF-κB inhibitor CAPE. Hmgb1 knockdown activated, but exogenous Hmgb1 inactivated, p-IGF1R/p-PI3K p-85/p-Akt/p-mTOR signaling. Knockdown of Klotho gene expression significantly decreased apoptosis, increased invasion in melanoma cells, and inhibited xenograft A375 tumor growth. A significantly high percentage of cells stained positive for p-NF-κB, but negative for Klotho, in melanoma tissues compared to normal and benign skin tissues. The positive p-NF-κB and negative Klotho protein expression correlated with poor prognosis in melanoma patients. Multivariate analysis revealed an independent association between p-NF-κB / Klotho protein level and overall survival. In conclusion, Hmgb1 can inhibit Klotho gene expression and malignant phenotype in melanoma cells through activation of NF-κB signaling.
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Affiliation(s)
- Biao Xie
- Deptment of Plastic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China.,Department of Colorectal Surgery, Second Affiliated Hospital, Hunan University of Chinese Medicine, Changsha, Hunan 410005, China
| | - Ke Cao
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Jinjin Li
- Department of Oncology, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Jia Chen
- Deptment of Plastic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Jintian Tang
- Institute of Medical Physics and Engineering, Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
| | - Xiang Chen
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Kun Xia
- State Key Laboratory, Medical Genetic, Central South University, Changsha, Hunan 410008, China
| | - Xiao Zhou
- Department of Oncoplast & Reconstructure Surgery, Affiliated Tumor Hospital, Central South University, Changsha, Hunan 410013, China
| | - Yan Cheng
- School of Pharmacy, Central South University, Changsha, Hunan 410013, China
| | - Jianda Zhou
- Deptment of Plastic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Huiqing Xie
- Department of Rehabilitation, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
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27
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Chen X, Tong H, Chen Y, Chen C, Ye J, Mo Q, Zhao G, Hong G, Zheng C, Lu Z. Klotho ameliorates sepsis-induced acute kidney injury but is irrelevant to autophagy. Onco Targets Ther 2018; 11:867-881. [PMID: 29497318 PMCID: PMC5823070 DOI: 10.2147/ott.s156891] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Background The role of Klotho (KL) in sepsis-induced acute kidney injury (AKI) and the potential relationship between KL and autophagy in septic AKI were investigated. Materials and methods A murine model of sepsis-induced AKI was established by cecal ligation and puncture (CLP). Mice undergoing CLP and immortalized proximal tubular epithelial human HK-2 cells that were exposed to lipopolysaccharide (LPS) were treated with recombinant KL, autophagy stimulator rapamycin (Rap), and autophagy suppressor 3-methyladenine (3-MA). Results Autophagy activation and KL reduction reached maximum levels in mice 24 hours after CLP. Recombinant KL and/or Rap significantly attenuated CLP-induced renal dysfunction (P<0.05) and partially restored endogenous renal KL expression (P<0.05). Recombinant KL had no impact on CLP-induced autophagy and apoptosis, whereas Rap significantly stimulated autophagy and reduced apoptosis in mice. 3-MA significantly exacerbated renal dysfunction, increased apoptosis, and inhibited autophagy in mice with CLP-induced AKI (all P<0.05). In LPS-treated HK-2 cells, Rap significantly enhanced autophagy and reduced apoptosis (all P<0.05), whereas recombinant KL had no impact, and 3-MA inhibited autophagy and significantly increased apoptosis (P<0.05). Conclusion Recombinant KL alleviates renal dysfunction and restores renal KL expression in mice with sepsis-induced AKI, but the underlying mechanism may not be related to autophagy induction.
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Affiliation(s)
- Xinxin Chen
- Department of Nephrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Huan Tong
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yu Chen
- Department of Nephrology, Wenzhou Hospital of Traditional Chinese Medicine Affiliated with Zhejiang Chinese Medical University, Wenzhou, Zhejiang, China
| | - Chaosheng Chen
- Department of Nephrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jingjing Ye
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Qingfei Mo
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Guangju Zhao
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Guangliang Hong
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Chenfei Zheng
- Department of Nephrology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhongqiu Lu
- Emergency Department, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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28
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Wu WKK, Zhang L, Chan MTV. Autophagy, NAFLD and NAFLD-Related HCC. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1061:127-138. [PMID: 29956211 DOI: 10.1007/978-981-10-8684-7_10] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) will become a dominant cause of hepatocellular carcinoma (HCC) in the coming decade. Whereas the exact molecular mechanisms underlying the progression from simple steatosis, through steatohepatitis, to HCC remains largely unclear, emerging evidence has supported a central role of defective autophagy in the pathogenesis of NAFLD and its complications. Autophagy not only regulates lipid metabolism and insulin resistance, but also protects hepatocytes from injury and cell death. Nevertheless, in inflammation and tumorigenesis, the role of autophagy is more paradoxical. In NAFLD, defective hepatic autophagy occurs at multiple levels through numerous mechanisms and is causally linked to NAFLD-related HCC. In this chapter, we summarize the regulation and function of autophagy in NAFLD and highlight recent identification of potential pharmacological agents for restoring autophagic flux in NAFLD.
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Affiliation(s)
- William K K Wu
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong. .,State Key Laboratory of Digestive Diseases, Department of Medicine & Therapeutics and LKS Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong.
| | - Lin Zhang
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong.,State Key Laboratory of Digestive Diseases, Department of Medicine & Therapeutics and LKS Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Matthew T V Chan
- Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong
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29
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Baluchnejadmojarad T, Eftekhari SM, Jamali-Raeufy N, Haghani S, Zeinali H, Roghani M. The anti-aging protein klotho alleviates injury of nigrostriatal dopaminergic pathway in 6-hydroxydopamine rat model of Parkinson's disease: Involvement of PKA/CaMKII/CREB signaling. Exp Gerontol 2017; 100:70-76. [DOI: 10.1016/j.exger.2017.10.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/01/2017] [Accepted: 10/23/2017] [Indexed: 02/09/2023]
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30
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Mencke R, Olauson H, Hillebrands JL. Effects of Klotho on fibrosis and cancer: A renal focus on mechanisms and therapeutic strategies. Adv Drug Deliv Rev 2017; 121:85-100. [PMID: 28709936 DOI: 10.1016/j.addr.2017.07.009] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 06/28/2017] [Accepted: 07/07/2017] [Indexed: 12/21/2022]
Abstract
Klotho is a membrane-bound protein predominantly expressed in the kidney, where it acts as a permissive co-receptor for Fibroblast Growth Factor 23. In its shed form, Klotho exerts anti-fibrotic effects in several tissues. Klotho-deficient mice spontaneously develop fibrosis and Klotho deficiency exacerbates the disease progression in fibrotic animal models. Furthermore, Klotho overexpression or supplementation protects against fibrosis in various models of renal and cardiac fibrotic disease. These effects are mediated at least partially by the direct inhibitory effects of soluble Klotho on TGFβ1 signaling, Wnt signaling, and FGF2 signaling. Soluble Klotho, as present in the circulation, appears to be the primary mediator of anti-fibrotic effects. Similarly, through inhibition of the TGFβ1, Wnt, FGF2, and IGF1 signaling pathways, Klotho also inhibits tumorigenesis. The Klotho promoter gene is generally hypermethylated in cancer, and overexpression or supplementation of Klotho has been found to inhibit tumor growth in various animal models. This review focuses on the protective effects of soluble Klotho in inhibiting renal fibrosis and fibrosis in distant organs secondary to renal Klotho deficiency. We also discuss the structure-function relationships of Klotho domains and biological effects in the context of potential targeted treatment strategies.
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Affiliation(s)
- Rik Mencke
- Department of Pathology and Medical Biology (Division of Pathology), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Hannes Olauson
- Department of Clinical Science, Intervention and Technology (Division of Renal Medicine), Karolinska Institutet, Stockholm, Sweden
| | - Jan-Luuk Hillebrands
- Department of Pathology and Medical Biology (Division of Pathology), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
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31
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Chen J, Zhang H, Hu J, Gu Y, Shen Z, Xu L, Jia X, Zhang X, Ding X. Hydrogen-Rich Saline Alleviates Kidney Fibrosis Following AKI and Retains Klotho Expression. Front Pharmacol 2017; 8:499. [PMID: 28848432 PMCID: PMC5554490 DOI: 10.3389/fphar.2017.00499] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 07/13/2017] [Indexed: 01/16/2023] Open
Abstract
Purpose: Acute kidney injury (AKI) is a prominent risk factor for the development of chronic kidney disease (CKD). To date, the related mechanism and effective therapy have not been rigorously explored. The present study aims to investigate the reno-protection of hydrogen-rich saline (HRS) against ischemia/reperfusion (IR)-induced AKI. Methods: Adult male C57 mice were randomly allocated into three groups: Sham, IR, IR+HRS. Renal IR injury model was generated via 35 min occlusion of bilateral kidney pedicles, and then, mice were administered with different treatments intraperitoneally in various groups. After 14- or 28-day treatment, mice were perfused and the kidneys were collected following reperfusion. Many proteins were detected by western blots, including renal fibrotic proteins [a-smooth muscle actin (a-SMA), collagen I (Col I)], Klotho, the methylation of Klotho, damage-regulated autophagy modulator (Beclin-1), and microtubule-associated protein light 3-II (LC3-II). Finally, the levels of serum blood urea nitrogen (BUN) and creatinine (Cr) were measured to investigate the renal function. Results: Histological data showed that the HRS treatment significantly decreased the fibrosis in renal tissues when compared with the IR group, and both of BUN and Cr were lower in the HRS group than IR group (8.9 ± 0.6 vs. 9.9 ± 0.1 mmol/l, 51 ± 6.5 vs. 60 ± 5.8 μmol/l) (P < 0.05). The expression of fibrotic markers, a-SMA and Col I, showed a robust increase in IR injury models than the Sham group, which was consistent with the result of Trichrome staining. However, the levels of a-SMA and Col I expression were sharply decreased in the IR+HRS group (P < 0.05). IR injury also enhanced LC3-II and Beclin-1 expression, but decreased Klotho level. The Klotho level was alleviated by HRS, but LC3-II and Beclin-1 were starkly enhanced in HRS group (P < 0.05). Conclusion: HRS showed a protective effect in the prevention of renal injury and could inhibit renal fibrosis after IR injury in mice. This role of HRS might be exerted via retaining Klotho expression and activating autophagy in the kidney.
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Affiliation(s)
- Jing Chen
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China.,Kidney and Dialysis Institute of ShanghaiShanghai, China.,Kidney and Blood Purification Laboratory of ShanghaiShanghai, China
| | - Han Zhang
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China.,Kidney and Dialysis Institute of ShanghaiShanghai, China.,Kidney and Blood Purification Laboratory of ShanghaiShanghai, China
| | - Jiachang Hu
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China.,Kidney and Dialysis Institute of ShanghaiShanghai, China.,Kidney and Blood Purification Laboratory of ShanghaiShanghai, China
| | - Yulu Gu
- Kidney and Dialysis Institute of ShanghaiShanghai, China
| | - Ziyan Shen
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China
| | - Linghan Xu
- Kidney and Dialysis Institute of ShanghaiShanghai, China
| | - Xueqi Jia
- Kidney and Dialysis Institute of ShanghaiShanghai, China
| | - Xiaoyan Zhang
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China.,Kidney and Dialysis Institute of ShanghaiShanghai, China.,Kidney and Blood Purification Laboratory of ShanghaiShanghai, China
| | - Xiaoqiang Ding
- Department of Nephrology, Zhongshan Hospital, Fudan UniversityShanghai, China.,Kidney and Dialysis Institute of ShanghaiShanghai, China.,Kidney and Blood Purification Laboratory of ShanghaiShanghai, China
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32
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Olauson H, Mencke R, Hillebrands JL, Larsson TE. Tissue expression and source of circulating αKlotho. Bone 2017; 100:19-35. [PMID: 28323144 DOI: 10.1016/j.bone.2017.03.043] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 03/15/2017] [Accepted: 03/16/2017] [Indexed: 12/16/2022]
Abstract
αKlotho (Klotho), a type I transmembrane protein and a coreceptor for Fibroblast Growth Factor-23, was initially thought to be expressed only in a limited number of tissues, most importantly the kidney, parathyroid gland and choroid plexus. Emerging data may suggest a more ubiquitous Klotho expression pattern which has prompted reevaluation of the restricted Klotho paradigm. Herein we systematically review the evidence for Klotho expression in various tissues and cell types in humans and other mammals, and discuss potential reasons behind existing conflicting data. Based on current literature and tissue expression atlases, we propose a classification of tissues into high, intermediate and low/absent Klotho expression. The functional relevance of Klotho in organs with low expression levels remain uncertain and there is currently limited data on a role for membrane-bound Klotho outside the kidney. Finally, we review the evidence for the tissue source of soluble Klotho, and conclude that the kidney is likely to be the principal source of circulating Klotho in physiology.
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Affiliation(s)
- Hannes Olauson
- Division of Renal Medicine, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.
| | - Rik Mencke
- Division of Pathology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Jan-Luuk Hillebrands
- Division of Pathology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Tobias E Larsson
- Division of Renal Medicine, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
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33
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Dalton GD, Xie J, An SW, Huang CL. New Insights into the Mechanism of Action of Soluble Klotho. Front Endocrinol (Lausanne) 2017; 8:323. [PMID: 29250031 PMCID: PMC5715364 DOI: 10.3389/fendo.2017.00323] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 11/02/2017] [Indexed: 12/31/2022] Open
Abstract
The klotho gene encodes a type I single-pass transmembrane protein that contains a large extracellular domain, a membrane spanning segment, and a short intracellular domain. Klotho protein exists in several forms including the full-length membrane form (mKl) and a soluble circulating form [soluble klotho (sKl)]. mKl complexes with fibroblast growth factor receptors to form coreceptors for FGF23, which allows it to participate in FGF23-mediated signal transduction and regulation of phosphate and calcium homeostasis. sKl is present in the blood, urine, and cerebrospinal fluid where it performs a multitude of functions including regulation of ion channels/transporters and growth factor signaling. How sKl exerts these pleiotropic functions is poorly understood. One hurdle in understanding sKl's mechanism of action as a "hormone" has been the inability to identify a receptor that mediates its effects. In the body, the kidneys are a major source of sKl and sKl levels decline during renal disease. sKl deficiency in chronic kidney disease makes the heart susceptible to stress-induced injury. Here, we summarize the current knowledge of mKl's mechanism of action, the mechanistic basis of sKl's protective, FGF23-independent effects on the heart, and provide new insights into the mechanism of action of sKl focusing on recent findings that sKl binds sialogangliosides in membrane lipid rafts to regulate growth factor signaling.
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Affiliation(s)
- George D. Dalton
- Department of Medicine, Division of Gastroenterology, Duke University Medical Center, Durham, NC, United States
| | - Jian Xie
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Iowa Carver College of Medicine, Iowa City, IA, United States
| | - Sung-Wan An
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Iowa Carver College of Medicine, Iowa City, IA, United States
| | - Chou-Long Huang
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Iowa Carver College of Medicine, Iowa City, IA, United States
- *Correspondence: Chou-Long Huang,
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34
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Prystupa A, Dąbrowska A, Sak JJ, Tarach J, Toruń-Jurkowska A, Lachowska-Kotowska P, Dzida G. Concentrations of fetuin-A, osteoprotegerin and α-Klotho in patients with alcoholic liver cirrhosis. Exp Ther Med 2016; 12:3464-3470. [PMID: 27882180 PMCID: PMC5103841 DOI: 10.3892/etm.2016.3754] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Accepted: 07/26/2016] [Indexed: 12/15/2022] Open
Abstract
The aim of the present study was to evaluate the concentrations of fetuin-A, osteoprotegerin (OPG) and α-Klotho protein in patients with alcoholic cirrhosis at different stages of the disease, and to demonstrate that fetuin-A, osteoprotegin and α-Klotho may be used as markers of the severity of cirrhosis. A total of 54 patients with alcoholic liver cirrhosis treated in various hospitals in the Lublin region of Poland were randomly enrolled. The control group consisted of 18 healthy individuals without liver disease, who did not drink alcohol. Serum levels of fetuin-A, OPG and α-Klotho were measured by ELISA kits. Levels of fetuin-A were significantly reduced in patients with alcoholic liver cirrhosis compared with the control group. OPG levels were higher in patients with alcoholic liver cirrhosis than in the controls, whereas the levels of α-Klotho were comparable in the cirrhosis and control groups. No statistically significant differences in the concentrations of fetuin-A, OPG and α-Klotho protein were demonstrated according to type of liver cirrhosis. The findings of the present study revealed a significant negative correlation between the level of α-Klotho protein and C-reactive protein in the patients with alcoholic liver cirrhosis. Concentrations of fetuin-A were lower, whereas those of OPG were higher, in the alcoholic liver cirrhosis group compared with the control group. Fetuin-A, OPG and α-Klotho may not be good indicators of liver cirrhosis severity. In conclusion, fetuin-A and OPG may be used in the diagnosis of liver cirrhosis.
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Affiliation(s)
- Andrzej Prystupa
- Department of Internal Medicine, Medical University of Lublin, 20-059 Lublin, Poland
| | - Anna Dąbrowska
- Department of Endocrinology, Medical University of Lublin, 20-059 Lublin, Poland
| | - Jarosław Jerzy Sak
- Department of Nephrology, Medical University of Lublin, 20-059 Lublin, Poland; Department of Ethics and Human Philosophy, Medical University of Lublin, 20-059 Lublin, Poland
| | - Jerzy Tarach
- Department of Endocrinology, Medical University of Lublin, 20-059 Lublin, Poland
| | - Anna Toruń-Jurkowska
- Department of Mathematics and Medical Biostatistics, Medical University of Lublin, 20-059 Lublin, Poland
| | | | - Grzegorz Dzida
- Department of Internal Medicine, Medical University of Lublin, 20-059 Lublin, Poland
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35
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Shi M, Flores B, Gillings N, Bian A, Cho HJ, Yan S, Liu Y, Levine B, Moe OW, Hu MC. αKlotho Mitigates Progression of AKI to CKD through Activation of Autophagy. J Am Soc Nephrol 2016; 27:2331-45. [PMID: 26701976 PMCID: PMC4978045 DOI: 10.1681/asn.2015060613] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 11/01/2015] [Indexed: 12/15/2022] Open
Abstract
AKI confers increased risk of progression to CKD. αKlotho is a cytoprotective protein, the expression of which is reduced in AKI, but the relationship of αKlotho expression level to AKI progression to CKD has not been studied. We altered systemic αKlotho levels by genetic manipulation, phosphate loading, or aging and examined the effect on long-term outcome after AKI in two models: bilateral ischemia-reperfusion injury and unilateral nephrectomy plus contralateral ischemia-reperfusion injury. Despite apparent initial complete recovery of renal function, both types of AKI eventually progressed to CKD, with decreased creatinine clearance, hyperphosphatemia, and renal fibrosis. Compared with wild-type mice, heterozygous αKlotho-hypomorphic mice (αKlotho haploinsufficiency) progressed to CKD much faster, whereas αKlotho-overexpressing mice had better preserved renal function after AKI. High phosphate diet exacerbated αKlotho deficiency after AKI, dramatically increased renal fibrosis, and accelerated CKD progression. Recombinant αKlotho administration after AKI accelerated renal recovery and reduced renal fibrosis. Compared with wild-type conditions, αKlotho deficiency and overexpression are associated with lower and higher autophagic flux in the kidney, respectively. Upregulation of autophagy protected kidney cells in culture from oxidative stress and reduced collagen 1 accumulation. We propose that αKlotho upregulates autophagy, attenuates ischemic injury, mitigates renal fibrosis, and retards AKI progression to CKD.
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Affiliation(s)
- Mingjun Shi
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research
| | - Brianna Flores
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research
| | - Nancy Gillings
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research
| | - Ao Bian
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research
| | - Han Jun Cho
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research
| | | | - Yang Liu
- Internal Medicine, Center for Autophagy Research, and
| | - Beth Levine
- Internal Medicine, Center for Autophagy Research, and Microbiology, and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Orson W Moe
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, Internal Medicine, Physiology,
| | - Ming Chang Hu
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, Internal Medicine,
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Zhou J, Yao W, Liu K, Wen Q, Wu W, Liu H, Li Q. MicroRNA let-7g regulates mouse granulosa cell autophagy by targeting insulin-like growth factor 1 receptor. Int J Biochem Cell Biol 2016; 78:130-140. [PMID: 27417237 DOI: 10.1016/j.biocel.2016.07.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 07/05/2016] [Accepted: 07/11/2016] [Indexed: 01/07/2023]
Abstract
As an important type of somatic cell, granulosa cells play a major role in deciding the fate of follicles. Therefore, analyses of granulosa cell apoptosis and follicular atresia have become hotspots of animal research. Autophagy is a cellular catabolic mechanism that protects cells from stress conditions, including starvation, hypoxia, and accumulation of misfolded proteins. However, the relationship between autophagy and apoptosis in granulosa cells is not well known. Here, we demonstrate that let-7g regulates the mouse granulosa cell autophagy signaling pathway by inhibiting insulin-like growth factor 1 receptor expression and affecting the phosphorylation of protein kinase B/mammalian target of rapamycin. Small interference-mediated knockdown of insulin-like growth factor 1 receptor significantly promoted autophagy signaling of mouse granulosa cells. In contrast, overexpression of insulin-like growth factor 1 receptor in mouse granulosa cells attenuated autophagy activity in the presence of let-7g. In addition, overexpression of let-7g increased the apoptosis rate, as indicated by an increased number of terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling-positive cells. Finally, 3-methyladenine as well as the lysosomal enzyme inhibitor chloroquine partially blocked apoptosis. In summary, this study demonstrates that let-7g regulates autophagy in mouse granulosa cells by targeting insulin-like growth factor 1 receptor and downregulating protein kinase B/mammalian target of rapamycin signaling, and that mouse granulosa cell autophagy induced by let-7g participates in apoptosis.
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Affiliation(s)
- Jilong Zhou
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Wang Yao
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Kaiqing Liu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Qiannan Wen
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Wangjun Wu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Honglin Liu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
| | - Qifa Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
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A Homogeneous Polysaccharide from Fructus Schisandra chinensis (Turz.) Baill Induces Mitochondrial Apoptosis through the Hsp90/AKT Signalling Pathway in HepG2 Cells. Int J Mol Sci 2016; 17:ijms17071015. [PMID: 27367669 PMCID: PMC4964391 DOI: 10.3390/ijms17071015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/10/2016] [Accepted: 06/17/2016] [Indexed: 02/07/2023] Open
Abstract
According to the potential anti-hepatoma therapeutic effect of Schisandra chinensis polysaccharides presented in previous studies, a bioactive constituent, homogeneous Schisandra chinensis polysaccharide-0-1 (SCP-0-1), molecular weight (MW) circa 69.980 kDa, was isolated and purified. We assessed the efficacy of SCP-0-1 against human hepatocellular liver carcinoma (HepG2) cells to investigate the effects of its antitumour activity and molecular mechanisms. Anticancer activity was evaluated using microscopy, 3-[4,5-dimethyl-2-thiazolyl]-2,5-diphenyltetrazolium bromide (MTT) assay, Hoechst 33258 staining, acridine orange (AO) staining, flow cytometry (FCM), and cell-cycle analysis. SCP-0-1 inhibited the HepG2 cells’ growth via inducing apoptosis and second gap/mitosis (G2/M) arrest dose-dependently, with a half maximal inhibitory concentration (IC50) value of 479.63 µg/mL. Western blotting of key proteins revealed the apoptotic and autophagic potential of SCP-0-1. Besides, SCP-0-1 upregulated Bcl-2 Associated X Protein (Bax) and downregulated B-cell leukemia/lymphoma 2 (Bcl-2) in the HepG2 cells. The expression of caspase-3, -8, and -9; poly (ADP-ribose) polymerase (PARP); cytochrome c (Cyt C); tumor protein 53 (p53); survivin; sequestosome 1 (p62); microtubule-associated protein 1 light chain-3B (LC3B); mitogen-activated protein kinase p38 (p38); extracellular regulated protein kinases (ERK); c-Jun N-terminal kinase (JNK); protein kinase B (AKT); and heat shock protein 90 (Hsp90) were evaluated using Western blotting. Our findings demonstrate a novel mechanism through which SCP-0-1 exerts its antiproliferative activity and induces mitochondrial apoptosis rather than autophagy. The induction of mitochondrial apoptosis was attributed to the inhibition of the Hsp90/AKT signalling pathway in an extracellular signal-regulated kinase-independent manner. The results also provide initial evidence on a molecular basis that SCP-0-1 can be used as an anti-hepatocellular carcinoma therapeutic agent in the future.
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Rubinek T, Wolf I. The Role of Alpha-Klotho as a Universal Tumor Suppressor. VITAMINS AND HORMONES 2016; 101:197-214. [PMID: 27125743 DOI: 10.1016/bs.vh.2016.03.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The klotho gene is implicated in many physiological activities, among them aging, glucose metabolism, and phosphate and calcium metabolism. Many cellular activities of klotho were implicated in promoting these activities. Two of them, inhibition of the insulin-like growth factor-1 pathway and of the Wnt signaling pathway, are also major pathways associated with cancer development and progression. These discoveries prompted a surge of research aiming to elucidate the role of klotho in cancer. Studies show that klotho is universally silenced in a wide array of malignancies, including breast, pancreatic, ovarian, lung, colorectal, and melanoma, and that klotho's expression can serve as an invaluable prognostic marker. Epigenetic mechanisms, ie, promoter hypermethylation and histone deacetylation, are mainly associated with klotho's silencing; however, different micro-RNAs were also demonstrated to be involved in the process. The activity of klotho on cancer cells growth was also widely investigated, and accumulating data suggest that klotho forced expression or treatment with the soluble protein can inhibit cancer development and progression. Moreover, studies now aim to reveal the specific region in klotho protein that underlies this anticancer activity in order to develop efficient and safe klotho-based medications.
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Affiliation(s)
- T Rubinek
- Institute of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.
| | - I Wolf
- Institute of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Tang X, Wang Y, Fan Z, Ji G, Wang M, Lin J, Huang S, Meltzer SJ. Klotho: a tumor suppressor and modulator of the Wnt/β-catenin pathway in human hepatocellular carcinoma. J Transl Med 2016; 96:197-205. [PMID: 26237271 PMCID: PMC4731258 DOI: 10.1038/labinvest.2015.86] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 05/15/2015] [Accepted: 05/19/2015] [Indexed: 02/08/2023] Open
Abstract
Klotho, an anti-aging gene, has recently been shown to contribute to human hepatic tumorigenesis. In addition, it is known that Wnt signaling is antagonized by the protein klotho. Because augmented Wnt signaling has an important role in tumorigenesis of human hepatocellular carcinoma (HCC), we studied the relationship of klotho expression and activity to the Wnt pathway in this malignancy. Immunohistochemical analysis performed on tissue arrays revealed that klotho expression levels were significantly lower in HCC than in adjacent noncancerous tissues, while klotho staining was inversely correlated with clinical stage and histologic grade. Patients with klotho-expressing tumors had longer survival periods than did those with klotho-negative tumors. Overexpression of klotho as well as treatment with soluble klotho protein reduced hepatoma cell growth in vitro and in vivo, whereas klotho silencing enhanced cellular proliferation. Moreover, forced expression of klotho inhibited Wnt/β-catenin signaling, as confirmed by reduced expression of β-catenin, inhibition of translocation of β-catenin from the cytoplasm to the nucleus, and reduced expression of c-myc and cyclin D1, two known target genes of the Wnt/β-catenin pathway. In contrast, activation of the Wnt/β-catenin pathway was enhanced when klotho was silenced by inhibitory RNAs. Furthermore, serum levels of soluble klotho in patients with malignant tumors were studied, and results suggested a significant increase in these levels in HCC patients. These data suggest that klotho acts as a tumor suppressor and an inhibitor of the Wnt/β-catenin pathway in HCC, and moreover, that soluble klotho is a potential serum biomarker for HCC.
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Affiliation(s)
- Xiaowei Tang
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China,Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yun Wang
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Zhining Fan
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Guozhong Ji
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Min Wang
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Jie Lin
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Shu Huang
- Medical Center for Digestive Diseases, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | - Stephen J Meltzer
- Departments of Medicine (Gastroenterology Division) and Oncology, Johns Hopkins University School of Medicine and Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD, USA
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Lim K, Groen A, Molostvov G, Lu T, Lilley KS, Snead D, James S, Wilkinson IB, Ting S, Hsiao LL, Hiemstra TF, Zehnder D. α-Klotho Expression in Human Tissues. J Clin Endocrinol Metab 2015; 100:E1308-18. [PMID: 26280509 PMCID: PMC4596032 DOI: 10.1210/jc.2015-1800] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT α-Klotho has emerged as a powerful regulator of the aging process. To date, the expression profile of α-Klotho in human tissues is unknown, and its existence in some human tissue types is subject to much controversy. OBJECTIVE This is the first study to characterize systemwide tissue expression of transmembrane α-Klotho in humans. We have employed next-generation targeted proteomic analysis using parallel reaction monitoring in parallel with conventional antibody-based methods to determine the expression and spatial distribution of human α-Klotho expression in health. RESULTS The distribution of α-Klotho in human tissues from various organ systems, including arterial, epithelial, endocrine, reproductive, and neuronal tissues, was first identified by immunohistochemistry. Kidney tissues showed strong α-Klotho expression, whereas liver did not reveal a detectable signal. These results were next confirmed by Western blotting of both whole tissues and primary cells. To validate our antibody-based results, α-Klotho-expressing tissues were subjected to parallel reaction monitoring mass spectrometry (data deposited at ProteomeXchange, PXD002775) identifying peptides specific for the full-length, transmembrane α-Klotho isoform. CONCLUSIONS The data presented confirm α-Klotho expression in the kidney tubule and in the artery and provide evidence of α-Klotho expression across organ systems and cell types that has not previously been described in humans.
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Abstract
Aging is an inevitable and progressive biological process involving dysfunction and eventually destruction of every tissue and organ. This process is driven by a tightly regulated and complex interplay between genetic and acquired factors. Klotho is an antiaging gene encoding a single-pass transmembrane protein, klotho, which serves as an aging suppressor through a wide variety of mechanisms, such as antioxidation, antisenescence, antiautophagy, and modulation of many signaling pathways, including insulin-like growth factor and Wnt. Klotho deficiency activates Wnt expression and activity contributing to senescence and depletion of stem cells, which consequently triggers tissue atrophy and fibrosis. In contrast, the klotho protein was shown to suppress Wnt-signaling transduction, and inhibit cell senescence and preserve stem cells. A better understanding of the potential effects of klotho on stem cells could offer novel insights into the cellular and molecular mechanisms of klotho deficiency-related aging and disease. The klotho protein may be a promising therapeutic agent for aging and aging-related disorders.
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Affiliation(s)
- Ao Bian
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX, USA ; Department of Nephrology, First Affiliated Hospital of Nanjing Medical University, Nanjing, People's Republic of China
| | - Javier A Neyra
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, USA
| | - Ming Zhan
- Methodist Hospital Research Institute, Weill Cornell Medical College, Houston, TX, USA
| | - Ming Chang Hu
- Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, University of Texas Southwestern Medical Center, Dallas, TX, USA ; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, USA
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Zhang Y, Lu H, Xu G. [Effect of PI3K/AKT pathway on cisplatin resistance in non-small cell lung cancer]. ZHONGGUO FEI AI ZA ZHI = CHINESE JOURNAL OF LUNG CANCER 2014; 17:635-42. [PMID: 25130971 PMCID: PMC6000368 DOI: 10.3779/j.issn.1009-3419.2014.08.09] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Accumulating evidences indicate that aberrant activation of PI3K/AKT pathway in non-small cell lung cancer plays a vital role in tumor cell proliferation,apoptosis, and survival including drug resistance. Cisplatin as first-line chemotherapy are in widespread clinical use in patients with non-small cell lung cancer, however, the development of cisplatin resistance significantly impedes its clinic efficacy. Cisplatin resistance is a complicated process that various mechanisms participating in to interact, of which PI3K/AKT pathway keeping sustained activated is one of the most important reasons. This article reviewed the progress of research on the relationship between PI3K/AKT pathway and cisplatin resistance.
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Affiliation(s)
- Yu Zhang
- Departmen of Cardiothoracic Surgery, Affiliated Hospital of Zunyi Medical College, Zunyi 563099, China
| | - Hongling Lu
- Department of Biochemistry, Zunyi Medical College, Zunyi 563099, China
| | - Gang Xu
- Departmen of Cardiothoracic Surgery, Affiliated Hospital of Zunyi Medical College, Zunyi 563099, China
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Zhou X, Wang X. Klotho: a novel biomarker for cancer. J Cancer Res Clin Oncol 2014; 141:961-9. [PMID: 25086986 DOI: 10.1007/s00432-014-1788-y] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 07/23/2014] [Indexed: 12/15/2022]
Abstract
BACKGROUND The Klotho gene was originally identified as an anti-aging gene in 1997. Recent studies have demonstrated aberrant expression of Klotho in a number of cancers, including breast cancer, lung cancer, hepatocellular carcinoma (HCC), and so on. METHODS A literature search focusing on dysregulation of Klotho and its possible mechanisms in cancer was performed. RESULTS AND CONCLUSIONS Downregulation of Klotho was found in several cancers, such as pancreatic cancer, HCC, and other tumors. Epigenetic modulation, such as promoter methylation and histone deacetylation, also contributed to the dysregulation of Klotho in cancers. Downregulation of Klotho resulted in promoted proliferation and reduced apoptosis of cancer cells. The relevant mechanisms include the fibroblast growth factor signaling, the insulin-like growth factor 1 receptor pathway, and the Wnt/β-catenin signaling pathway. Furthermore, the Klotho protein hopefully provides new insights into cancer target treatment.
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Affiliation(s)
- Xiangxiang Zhou
- Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong University, No. 324, Jingwu Road, Jinan, 250021, Shandong, People's Republic of China
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The anti-aging and tumor suppressor protein Klotho enhances differentiation of a human oligodendrocytic hybrid cell line. J Mol Neurosci 2014; 55:76-90. [PMID: 24907942 DOI: 10.1007/s12031-014-0336-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 05/16/2014] [Indexed: 12/12/2022]
Abstract
Klotho functions as an aging suppressor, which, in mice, extends lifespan when overexpressed and accelerates development of aging-like phenotypes when disrupted. Klotho is mainly expressed in brain and kidney and is secreted into the serum and CSF. We have previously shown that Klotho is reduced in brains of old monkeys, rats, and mice. We further reported the ability of Klotho to enhance oligodendrocyte differentiation and myelination. Here, we examined the signaling pathways induced by Klotho in MO3.13, a human oligodendrocytic hybrid cell line. We show that exogenous Klotho affects the ERK and Akt signaling pathways, decreases the proliferative abilities and enhances differentiation of MO3.13 cells. Furthermore, microarray analysis of Klotho-treated MO3.13 cells reveals a massive change in gene expression with 80 % of the differentially expressed genes being downregulated. Using gene set enrichment analysis, we predicted potential transcription factors involved in regulating Klotho-treated MO3.13 cells and found that these cells are highly enriched in the gene sets, that are similarly observed in cancer, cardiovascular disease, stress, aging, and hormone-related chemical and genetic perturbations. Since Klotho is downregulated in all brain tumors tested to date, enhancing Klotho has therapeutic potential for treating brain and other malignancies.
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Zhang L, Wang H, Xu J, Zhu J, Ding K. Inhibition of cathepsin S induces autophagy and apoptosis in human glioblastoma cell lines through ROS-mediated PI3K/AKT/mTOR/p70S6K and JNK signaling pathways. Toxicol Lett 2014; 228:248-59. [PMID: 24875536 DOI: 10.1016/j.toxlet.2014.05.015] [Citation(s) in RCA: 115] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 05/08/2014] [Accepted: 05/15/2014] [Indexed: 02/07/2023]
Abstract
Cathepsin S is a lysosomal cysteine protease that is overexpressed in various cancer models and plays important role in tumorigenesis, however the mechanisms are unclear. In the present study, we found that inhibition of cathepsin S induced autophagy and mitochondrial apoptosis in human glioblastoma cells. Blockade of autophagy by either a chemical inhibitor or RNA interference attenuated cathespin S inhibition-induced apoptosis. Furthermore, autophagy and apoptosis induction was dependent on the suppression of phosphatidylinositide 3-kinases/protein kinase B/mammalian target of rapamycin/p70S6 kinase (PI3K/AKT/mTOR/p70S6K) signaling pathway and activation of c-Jun N-terminal kinase (JNK) signaling pathway. In addition, reactive oxygen species (ROS) served as an upstream of PI3K/AKT/mTOR/p70S6K and JNK signaling pathways. In conclusion, the current study revealed that cathepsin S played an important role in the regulation of autophagy and apoptosis in human glioblastoma cells.
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Affiliation(s)
- Li Zhang
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China
| | - Handong Wang
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China.
| | - Jianguo Xu
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China
| | - Jianhong Zhu
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China
| | - Ke Ding
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China
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Li XX, Huang LY, Peng JJ, Liang L, Shi DB, Zheng HT, Cai SJ. Klotho suppresses growth and invasion of colon cancer cells through inhibition of IGF1R-mediated PI3K/AKT pathway. Int J Oncol 2014; 45:611-8. [PMID: 24818842 DOI: 10.3892/ijo.2014.2430] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 04/11/2014] [Indexed: 11/05/2022] Open
Abstract
Klotho (KL) was originally characterized as an aging suppressor gene, and has been identified as a tumor suppressor gene in a variety of cancers including colon cancer. However, the potential role and molecular events for KL in colon cancer remain unclear. The present study aimed to investigate the expression of KL in human colon cancer by immunohistochemistry, and to analyze the correlation between KL expression and clinicopathological characteristics of patients with colon cancer. Functional analysis after lentivirus-mediated gain of KL expression was used to assess the tumor growth and invasion in colon cancer cells in vitro and in vivo. The rate of KL expression was significantly decreased in cancer tissues compared with that in adjacent non-cancer tissues (ANCT) (60.3 vs.77.9%, P=0.022), and KL expression was negatively associated with Dukes staging (P=0.034) and depth of tumor invasion (P=0.008). Overexpression of KL in vitro inhibited cell proliferative activities and invasive potential in colon cancer cells, companied with decreased expression of p-IGF1R, p-PI3K, p-AKT, PCNA and MMP-2. In addition, the tumor volumes in the HT-29 subcutaneous tumor model treated with lentivirus‑mediated KL vector (Lv-KL) was significantly smaller than those of the negative control (NC) group (P<0.01). Taken together, our findings indicate that the expression of KL is downregulated in human colon caner and correlates with tumor invasion and Dukes staging, while overexpression of KL suppresses growth and invasion through inhibition of IGF1R-mediated PI3K/AKT pathway in colon cancer cells, suggesting that KL may serve as a potential therapeutic target for the treatment of colon cancer.
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Affiliation(s)
- Xin-Xiang Li
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - Li-Yong Huang
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - Jun-Jie Peng
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - Lei Liang
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - De-Bing Shi
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - Hong-Tu Zheng
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
| | - San-Jun Cai
- Department of Colorectal Surgery, Fudan University Shanghai Cancer Center and Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, P.R. China
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Abstract
The klotho gene is a classical "aging suppressor" gene. Its roles in the pathology of chronic kidney diseases have been well documented. However, the role of Klotho in tumorigenesis, cancer progression, and prognosis is attracting more and more attention. Recent studies have shown that Klotho participates in the progression of several types of human cancers. Klotho functions as a tumor suppressor by inhibiting insulin/IGF1, p53/p21, and Wnt signaling. Silencing klotho gene expression is mainly mediated through promoter hypermethylation and histone deacetylation in cancer. Klotho has been proposed to take part in cell proliferation, survival, autophagy, and resistance to anti-cancer therapies.
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48
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Alisi A, Ceccarelli S, Panera N, Prono F, Petrini S, De Stefanis C, Pezzullo M, Tozzi A, Villani A, Bedogni G, Nobili V. Association between Serum Atypical Fibroblast Growth Factors 21 and 19 and Pediatric Nonalcoholic Fatty Liver Disease. PLoS One 2013; 8:e67160. [PMID: 23840612 PMCID: PMC3694051 DOI: 10.1371/journal.pone.0067160] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 05/14/2013] [Indexed: 01/09/2023] Open
Abstract
Atypical fibroblast growth factors (FGF) 21 and 19 play a central role in energy metabolism through the mediation of Klotho coreceptor. Contradictory findings are available about the association of FGF21 and FGF19 with nonalcoholic fatty liver disease (NAFLD) in humans. We investigated the association of serum FGF21, FGF19 and liver Klotho coreceptor with non-alcoholic steatohepatitis (NASH) and fibrosis in children with NAFLD. Serum FGF21 and FGF19 were measured in 84 children with biopsy-proven NAFLD and 23 controls (CTRL). The hepatic expression of Klotho coreceptor was measured in 7 CTRL, 9 patients with NASH (NASH+) and 11 patients without NASH (NASH−). FGF21 and FGF19 showed a tendency to decrease from CTRL (median FGF21 = 196 pg/mL; median FGF19 = 201 pg/mL) to NASH− (FGF21 = 89 pg/mL; FGF19 = 81 pg/mL) to NASH+ patients (FGF21 = 54 pg/mL; FGF19 = 41 pg/mL) (p<0.001 for all comparisons) and were inversely associated with the probability of NASH and fibrosis in children with NAFLD. The hepatic expression of Klotho coreceptor was inversely associated with NASH (R2 = 0.87, p<0.0001) and directly associated with serum FGF21 (R2 = 0.57, p<0.0001) and FGF19 (R2 = 0.67, p<0.0001). In conclusion, serum FGF19 and FGF21 and hepatic Klotho expression are inversely associated with hepatic damage in children with NAFLD and these findings may have important implications for understanding the mechanisms of NAFLD progression.
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Affiliation(s)
- Anna Alisi
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
- * E-mail:
| | - Sara Ceccarelli
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Nadia Panera
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Federica Prono
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Stefania Petrini
- Microscopy Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Cristiano De Stefanis
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Marco Pezzullo
- Core Facilities, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Alberto Tozzi
- Epidemiology Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Alberto Villani
- Pediatrics and Infectious Disease Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Giorgio Bedogni
- Clinical Epidemiology Unit, Liver Research Center, Trieste, Italy
| | - Valerio Nobili
- Hepato-Metabolic Disease Unit and Liver Research Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
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