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Emili M, Stagni F, Russo C, Angelozzi L, Guidi S, Bartesaghi R. Reversal of neurodevelopmental impairment and cognitive enhancement by pharmacological intervention with the polyphenol polydatin in a Down syndrome model. Neuropharmacology 2024; 261:110170. [PMID: 39341334 DOI: 10.1016/j.neuropharm.2024.110170] [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: 04/23/2024] [Revised: 09/16/2024] [Accepted: 09/25/2024] [Indexed: 10/01/2024]
Abstract
Intellectual disability (ID) is the unavoidable hallmark of Down syndrome (DS), a genetic condition due to triplication of chromosome 21. ID in DS is largely attributable to neurogenesis and dendritogenesis alterations taking place in the prenatal/neonatal period, the most critical time window for brain development. There are currently no treatments for ID in DS. Considering the timeline of brain development, treatment aimed at improving the neurological phenotypes of DS should be initiated as early as possible and use safe agents. The goal of this study was to establish whether it is possible to improve DS-linked neurodevelopmental defects through early treatment with polydatin, a natural polyphenol. We used the Ts65Dn mouse model of DS and focused on the hippocampus, a brain region fundamental for long-term memory. We found that in Ts65Dn mice of both sexes treated with polydatin from postnatal (P) day 3 to P15 there was full restoration of neurogenesis, neuron number, and dendritic development. These effects were accompanied by normalization of Cyclin D1 and DSCAM levels, which may account for the rescue of neurogenesis and dendritogenesis, respectively. Importantly, in Ts65Dn mice treated with polydatin from P3 to adolescence (∼P50) there was full restoration of hippocampus-dependent memory, indicating a pro-cognitive outcome of treatment. No adverse effects were observed on the body and brain weight. The efficacy and safety of polydatin in a model of DS prospect the possibility of its use during early life stages for amelioration of DS-linked neurodevelopmental alterations.
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Affiliation(s)
- Marco Emili
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Fiorenza Stagni
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Carla Russo
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Laura Angelozzi
- Department for Life Quality Studies, University of Bologna, Rimini, Italy
| | - Sandra Guidi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Renata Bartesaghi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy.
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2
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Yang Y, Yuan K, Liu Y, Wang Q, Lin Y, Yang S, Huang K, Kan T, Zhang Y, Xu M, Yu Z, Fan Q, Wang Y, Li H, Tang T. Constitutively activated AMPKα1 protects against skeletal aging in mice by promoting bone-derived IGF-1 secretion. Cell Prolif 2023; 56:e13476. [PMID: 37042047 PMCID: PMC10542616 DOI: 10.1111/cpr.13476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 04/13/2023] Open
Abstract
Senile osteoporosis is characterized by age-related bone loss and bone microarchitecture deterioration. However, little is known to date about the mechanism that maintains bone homeostasis during aging. In this study, we identify adenosine monophosphate-activated protein kinase alpha 1 (AMPKα1) as a critical factor regulating the senescence and lineage commitment of mesenchymal stem cells (MSCs). A phospho-mutant mouse model shows that constitutive AMPKα1 activation prevents age-related bone loss and promoted MSC osteogenic commitment with increased bone-derived insulin-like growth factor 1 (IGF-1) secretion. Mechanistically, upregulation of IGF-1 signalling by AMPKα1 depends on cAMP-response element binding protein (CREB)-mediated transcriptional regulation. Furthermore, the essential role of the AMPKα1/IGF-1/CREB axis in promoting aged MSC osteogenic potential is confirmed using three-dimensional (3D) culture systems. Taken together, these results can provide mechanistic insight into the protective effect of AMPKα1 against skeletal aging by promoting bone-derived IGF-1 secretion.
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Affiliation(s)
- Yiqi Yang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Kai Yuan
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Yihao Liu
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Qishan Wang
- School of PharmacyShanghai Jiao Tong UniversityShanghaiChina
| | - Yixuan Lin
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Shengbing Yang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Kai Huang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Tianyou Kan
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Yuxin Zhang
- Department of Rehabilitation Medicine, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Mingming Xu
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Zhifeng Yu
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Qiming Fan
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Yugang Wang
- Department of Trauma Surgery, Department of Orthopedics, Renji Hospital, School of MedicineShanghai Jiao Tong UniversityShanghaiChina
| | - Hanjun Li
- Clinical Stem Cell Research Center, Renji HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Tingting Tang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
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Jiang Y, Zhu L, Wu D, Ni Y, Huang C, Ye H, Yang Y, Liu R, Li Y. Type IIB PKA is highly expressed in β cells and controls cell proliferation via regulating Cyclin D1 expression. FEBS J 2021; 289:2865-2876. [PMID: 34839588 DOI: 10.1111/febs.16302] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 11/09/2021] [Accepted: 11/26/2021] [Indexed: 12/01/2022]
Abstract
β cell number is maintained mainly by cell proliferation and cell apoptosis. Protein kinase A (PKA) pathway is an important intracellular signalling-mediating β cell proliferation. However, the precise roles of PKA isoforms are not well-defined. We found that the RIIB subunit of PKA is expressed specifically by β cells of mouse and human islets. Sixty percent pancreatectomy caused increased β cell proliferation. Deletion of type IIB PKA by disruption of RIIB expression further promoted β cell proliferation, leading to enhanced β cell mass expansion. RIIB KO mice also showed increased insulin levels and improved glucose tolerance. Mechanistically, activation of type IIB PKA decreased Cyclin D1 levels and inhibition of RIIB expression increased Cyclin D1 levels. Consistently, activation of type IIB PKA inhibited cell cycle entry. These results suggest that type IIB PKA plays a pivotal role in β cell proliferation via regulating Cyclin D1 expression.
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Affiliation(s)
- Yaojing Jiang
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Lu Zhu
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Di Wu
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Yunzhi Ni
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Chuxin Huang
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Hongying Ye
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Yehong Yang
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Rui Liu
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
| | - Yiming Li
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, Shanghai, China
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4
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Koch LM, Birkeland ES, Battaglioni S, Helle X, Meerang M, Hiltbrunner S, Ibáñez AJ, Peter M, Curioni-Fontecedro A, Opitz I, Dechant R. Cytosolic pH regulates proliferation and tumour growth by promoting expression of cyclin D1. Nat Metab 2020; 2:1212-1222. [PMID: 33077976 DOI: 10.1038/s42255-020-00297-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 09/10/2020] [Indexed: 01/03/2023]
Abstract
Enhanced growth and proliferation of cancer cells are accompanied by profound changes in cellular metabolism. These metabolic changes are also common under physiological conditions, and include increased glucose fermentation accompanied by elevated cytosolic pH (pHc)1,2. However, how these changes contribute to enhanced cell growth and proliferation is unclear. Here, we show that elevated pHc specifically orchestrates an E2F-dependent transcriptional programme to drive cell proliferation by promoting cyclin D1 expression. pHc-dependent transcription of cyclin D1 requires the transcription factors CREB1, ATF1 and ETS1, and the histone acetyltransferases p300 and CBP. Biochemical characterization revealed that the CREB1-p300/CBP interaction acts as a pH sensor and coincidence detector, integrating different mitotic signals to regulate cyclin D1 transcription. We also show that elevated pHc contributes to increased cyclin D1 expression in malignant pleural mesotheliomas (MPMs), and renders these cells hypersensitive to pharmacological reduction of pHc. Taken together, these data demonstrate that elevated pHc is a critical cellular signal regulating G1 progression, and provide a mechanism linking elevated pHc to oncogenic activation of cyclin D1 in MPMs, and possibly other cyclin D1~dependent tumours. Thus, an increase of pHc may represent a functionally important, early event in the aetiology of cancer that is amenable to therapeutic intervention.
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Affiliation(s)
- Lisa Maria Koch
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland
- Life science Zürich, PhD program for Molecular Life Sciences, Zurich, Switzerland
| | - Eivind Salmorin Birkeland
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland
- Life science Zürich, PhD program for Molecular Life Sciences, Zurich, Switzerland
| | - Stefania Battaglioni
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland
- Biozentrum, University of Basel, Basel, Switzerland
| | - Xiao Helle
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Mayura Meerang
- Department of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Stefanie Hiltbrunner
- Department of Medical Oncology and Hematology, University Hospital Zurich, Comprehensive Cancer Center Zurich, University of Zurich, Zurich, Switzerland
| | - Alfredo J Ibáñez
- Core facility for Omics Research and Applied Biotechnology (ICOBA), Pontificia Universidad Católica del Perú, Lima, Peru
| | - Matthias Peter
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland
| | - Alessandra Curioni-Fontecedro
- Department of Medical Oncology and Hematology, University Hospital Zurich, Comprehensive Cancer Center Zurich, University of Zurich, Zurich, Switzerland
| | - Isabelle Opitz
- Department of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Reinhard Dechant
- Institute of Biochemistry, Department of Biology, ETH Zurich, Zurich, Switzerland.
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5
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Jacques FJ, Silva TM, da Silva FE, Ornelas IM, Ventura ALM. Nucleotide P2Y13-stimulated phosphorylation of CREB is required for ADP-induced proliferation of late developing retinal glial progenitors in culture. Cell Signal 2017; 35:95-106. [PMID: 28347874 DOI: 10.1016/j.cellsig.2017.03.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 02/23/2017] [Accepted: 03/24/2017] [Indexed: 12/28/2022]
Abstract
Nucleotides stimulate phosphorylation of CREB to induce cell proliferation and survival in diverse cell types. We report here that ADP induces the phosphorylation of CREB in a time- and concentration-dependent manner in chick embryo retinal progenitors in culture. ADP-induced increase in phospho-CREB is mediated by P2 receptors as it is blocked by PPADS but not by the adenosine antagonists DPCPX or ZM241385. Incubation of the cultures with the CREB inhibitor KG-501 prevents ADP-induced incorporation of [3H]-thymidine, indicating that CREB is involved in retinal cell proliferation. No effect of this compound is observed on the viability of retinal progenitors. While no significant increase in CREB phosphorylation is observed with the P2Y1 receptor agonist MRS2365, ADP-induced phosphorylation of CREB is blocked by the P2Y13 receptor selective antagonist MRS2211, but not by MRS2179 or PSB0739, two antagonists of the P2Y1 and P2Y12 receptors, respectively, suggesting that ADP-induced CREB phosphorylation is mediated by P2Y13 receptors. ADP-induced increase in phospho-CREB is attenuated by the PI3K inhibitor LY294002 and completely prevented by the MEK inhibitor U0126, suggesting that at least ERK is involved in ADP-induced CREB phosphorylation. A pharmacological profile similar to the activation and inhibition of CREB phosphorylation is observed in the phosphorylation of ERK, suggesting that P2Y13 receptors mediate ADP induced ERK/CREB pathway in the cultures. While no increase in [3H]-thymidine incorporation is observed with the P2Y1 receptor agonist MRS2365, both MRS2179 and MRS2211 prevent ADP-mediated increase in [3H]-thymidine incorporation, but not progenitor's survival, suggesting that both P2Y1 and P2Y13 receptor subtypes are involved in ADP-induced cell proliferation. P2Y1 receptor-mediated increase in [Ca2+]i is observed in glial cells only when cultures maintained for 9days are used. In glia from cultures cultivated for only 2days, no increase in [Ca2+]i is detected with MRS2365 and no inhibition of ADP-mediated calcium response is observed with MRS2179. In contrast, MRS2211 attenuates ADP-mediated increase in [Ca2+]i in glial cells from cultures at both stages, suggesting the presence of P2Y13 receptors coupled to calcium mobilization in proliferating retinal glial progenitors in culture.
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Affiliation(s)
- Flavia Jesus Jacques
- Department of Neurobiology, Neuroscience Program, Fluminense Federal University, Outeiro de São João Batista s/n, Centro, Niterói, Rio de Janeiro CEP 24020-141, Brazil
| | - Thayane Martins Silva
- Department of Neurobiology, Neuroscience Program, Fluminense Federal University, Outeiro de São João Batista s/n, Centro, Niterói, Rio de Janeiro CEP 24020-141, Brazil
| | - Flavia Emenegilda da Silva
- Department of Neurobiology, Neuroscience Program, Fluminense Federal University, Outeiro de São João Batista s/n, Centro, Niterói, Rio de Janeiro CEP 24020-141, Brazil
| | - Isis Moraes Ornelas
- Department of Neurobiology, Neuroscience Program, Fluminense Federal University, Outeiro de São João Batista s/n, Centro, Niterói, Rio de Janeiro CEP 24020-141, Brazil
| | - Ana Lucia Marques Ventura
- Department of Neurobiology, Neuroscience Program, Fluminense Federal University, Outeiro de São João Batista s/n, Centro, Niterói, Rio de Janeiro CEP 24020-141, Brazil.
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6
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Xu H, Zhang J, Lei Y, Han Z, Rong D, Yu Q, Zhao M, Tian J. Low frequency pulsed electromagnetic field promotes C2C12 myoblasts proliferation via activation of MAPK/ERK pathway. Biochem Biophys Res Commun 2016; 479:97-102. [PMID: 27629357 DOI: 10.1016/j.bbrc.2016.09.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 09/09/2016] [Indexed: 01/16/2023]
Abstract
Low frequency pulsed electromagnetic field (PEMF) has been shown to affect the activity of various cell types and promote them proliferation. However, its effect on skeletal muscle cells remains to be determined. In our study, we confirmed that PEMF (100 Hz, 1 mT) could promote C2C12 myoblasts proliferation by using Cell Counting Kit-8 (CCK-8) and 5-Ethynyl-2'-deoxyuridine (EdU) assays, yet hardly any distinction was found in the rate of cell apoptosis between PEMF and control groups by flow cytometry (Annexin V-FITC/PI double staining method). To further study the mechanism of action of PEMF, Western blot was utilized to detect the mitogen-activated protein kinase (MAPK) signaling pathways. After exposing C2C12 myoblasts to PEMF, we found the phosphorylation level of extracellular signal-regulated kinase (ERK) was significantly increased, while p38 MAPK and c-Jun N-terminal kinase (JNK) pathways were not affected. Pretreating the cells with the ERK kinase1/2 (MEK1/2) inhibitor U0126 obviously inhibited the proliferation of C2C12 cells. Taken together, our research for the first time demonstrated that PEMF promoted C2C12 myoblasts proliferation via activating MAPK/ERK pathway.
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Affiliation(s)
- Haixia Xu
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Jie Zhang
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Yutian Lei
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Zhongyu Han
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Dongming Rong
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Qiang Yu
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China
| | - Ming Zhao
- Department of Pathophysiology, Basic Medical College, Southern Medical University, Baiyun, Guangzhou 510515, China
| | - Jing Tian
- Department of Orthopaedics, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Haizhu, Guangzhou 510280, China.
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7
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Nascimento AR, Macheroni C, Lucas TFG, Porto CS, Lazari MFM. Crosstalk between FSH and relaxin at the end of the proliferative stage of rat Sertoli cells. Reproduction 2016; 152:613-628. [PMID: 27601715 DOI: 10.1530/rep-16-0330] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Accepted: 09/05/2016] [Indexed: 12/31/2022]
Abstract
Follicle-stimulating hormone (FSH) stimulates the proliferation of immature Sertoli cells through the activation of PI3K/AKT/mTORC1 and MEK/ERK1/2 pathways. Mature Sertoli cells stop proliferating and respond to FSH by stimulating cAMP production. To gain insight into possible mechanisms involved in this switch as well as the impact of paracrine factors that stimulate cell proliferation, we analyzed the effects of FSH and relaxin on intracellular signaling pathways involved with proliferation and differentiation in Sertoli cells from 15-day-old rats, which are close to the transition between the two stages. FSH stimulated 3H-thymidine incorporation and cyclin D1 expression, changes associated with proliferation. In contrast, FSH inhibited AKT and ERK1/2 phosphorylation, activated cAMP production and induced changes in several cell cycle genes that were compatible with differentiation. Relaxin also stimulated 3H-thymidine incorporation but increased phosphorylation of ERK1/2 and AKT. When both hormones were added simultaneously, relaxin attenuated FSH-mediated inhibition of ERK1/2 and AKT phosphorylation and FSH-mediated activation of cAMP production. FSH but not relaxin increased CREB phosphorylation, and relaxin but not FSH shifted NF-κB expression from the cytoplasm to the nucleus. Relaxin did not inhibit the effects of FSH on inhibin α and Bcl2 expression. We propose that at this time of Sertoli cell development, FSH starts to direct cells to differentiation through activation of cAMP/CREB and inhibition of ERK1/2 and AKT pathways. Relaxin counteracts FSH signaling through the inhibition of cAMP and activation of ERK1/2, AKT and NF-κB, but does not block the differentiation process triggered by FSH.
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Affiliation(s)
- Aline R Nascimento
- Section of Experimental EndocrinologyDepartment of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - Carla Macheroni
- Section of Experimental EndocrinologyDepartment of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - Thais F G Lucas
- Section of Experimental EndocrinologyDepartment of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - Catarina S Porto
- Section of Experimental EndocrinologyDepartment of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - Maria F M Lazari
- Section of Experimental EndocrinologyDepartment of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
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8
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Li X, Kover KL, Heruth DP, Watkins DJ, Moore WV, Jackson K, Zang M, Clements MA, Yan Y. New Insight Into Metformin Action: Regulation of ChREBP and FOXO1 Activities in Endothelial Cells. Mol Endocrinol 2015; 29:1184-94. [PMID: 26147751 DOI: 10.1210/me.2015-1090] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Metformin has been considered a potential adjunctive therapy in treating poorly controlled type 1 diabetes with obesity and insulin resistance, owing to its potent effects on improving insulin sensitivity. However, the underlying mechanism of metformin's vascular protective effects remains obscure. Thioredoxin-interacting protein (TXNIP), a key regulator of cellular redox state induced by high-glucose concentration, decreases thioredoxin reductase activity and mediates apoptosis induced by oxidative stress. Here we report that high glucose-induced endothelial dysfunction is associated with induction of TXNIP expression in primary human aortic endothelial cells exposed to high-glucose conditions, whereas the metformin treatment suppresses high-glucose-induced TXNIP expression at mRNA and protein levels. We further show that metformin decreases the high-glucose-stimulated nuclear entry rate of two transcription factors, carbohydrate response element-binding protein (ChREBP) and forkhead box O1 (FOXO1), as well as their recruitment on the TXNIP promoter. An AMP-activated protein kinase inhibitor partially compromised these metformin effects. Our data suggest that endothelial dysfunction resulting from high-glucose concentrations is associated with TXNIP expression. Metformin down-regulates high-glucose-induced TXNIP transcription by inactivating ChREBP and FOXO1 in endothelial cells, partially through AMP-activated protein kinase activation.
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Affiliation(s)
- Xiaoyu Li
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Karen L Kover
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Daniel P Heruth
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Dara J Watkins
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Wayne V Moore
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Kathyrin Jackson
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Mengwei Zang
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Mark A Clements
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
| | - Yun Yan
- Division of Endocrinology (X.L., K.L.K., D.J.W., W.V.M., K.J., M.A.C., Y.Y.), Department of Pediatrics, and Division of Experimental and Translational Genetics (D.P.H.), Department of Pediatrics, Children's Mercy Hospital and University of Missouri-Kansas City, Kansas City, Missouri 64108; and Department of Medicine (M.Z.), Vascular Biology Section, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts 02481
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9
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Kranz K, Warnecke A, Lenarz T, Durisin M, Scheper V. Phosphodiesterase type 4 inhibitor rolipram improves survival of spiral ganglion neurons in vitro. PLoS One 2014; 9:e92157. [PMID: 24642701 PMCID: PMC3958480 DOI: 10.1371/journal.pone.0092157] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 02/17/2014] [Indexed: 12/11/2022] Open
Abstract
Sensorineural deafness is caused by damage of hair cells followed by degeneration of the spiral ganglion neurons and can be moderated by cochlear implants. However, the benefit of the cochlear implant depends on the excitability of the spiral ganglion neurons. Therefore, current research focuses on the identification of agents that will preserve their degeneration. In this project we investigated the neuroprotective effect of Rolipram as a promising agent to improve the viability of the auditory neurons. It is a pharmaceutical agent that acts by selective inhibition of the phosphodiesterase 4 leading to an increase in cyclic AMP. Different studies reported a neuroprotective effect of Rolipram. However, its significance for the survival of SGN has not been reported so far. Thus, we isolated spiral ganglion cells of neonatal rats for cultivation with different Rolipram concentrations and determined the neuronal survival rate. Furthermore, we examined immunocytologically distinct proteins that might be involved in the neuroprotective signalling pathway of Rolipram and determined endogenous BDNF by ELISA. When applied at a concentration of 0.1 nM, Rolipram improved the survival of SGN in vitro. According to previous studies, our immunocytological data showed that Rolipram application induces the phosphorylation and thereby activation of the transcription factor CREB. This activation can be mediated by the cAMP-PKA-signalling pathway as well as via ERK as a part of the MAP-kinase pathway. However, only in cultures pre-treated with BDNF, an endogenous increase of BDNF was detected. We conclude that Rolipram has the potential to improve the vitality of neonatal auditory nerve cells in vitro. Further investigations are necessary to prove the effect of Rolipram in vivo in the adult organism after lesion of the hair cells and insertion of cochlear implants.
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Affiliation(s)
- Katharina Kranz
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Athanasia Warnecke
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Thomas Lenarz
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Martin Durisin
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
| | - Verena Scheper
- Department of Otolaryngology, Hannover Medical School, Hannover, Germany
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