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Zhang B, Chen X, Wang Z, Guo F, Zhang X, Huang B, Ma S, Xia S, Shang D. Identifying endoplasmic reticulum stress-related molecular subtypes and prognostic model for predicting the immune landscape and therapy response in pancreatic cancer. Aging (Albany NY) 2023; 15:10549-10579. [PMID: 37815881 PMCID: PMC10599750 DOI: 10.18632/aging.205094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 09/09/2023] [Indexed: 10/12/2023]
Abstract
Endoplasmic reticulum stress (ERS) is caused by the accumulation of intracellular misfolded or unfolded proteins and is associated with cancer development. In this study, pan-cancer analysis revealed complex genetic variations, including copy number variation, methylation, and somatic mutations for ERS-related genes (ERGs) in 33 kinds of cancer. Consensus clustering divided pancreatic cancer (PC) patients from TCGA and GEO databases into two ERS-related subtypes: ERGcluster A and B. Compared with ERGcluster A, ERGcluster B had a more active ERS state and worse prognosis. Subsequently, the ERS-related prognostic model was established to quantify the ERS score for a single sample. The patient with a low ERS score had remarkably longer survival times. ssGSEA and CIBERSORT algorithms revealed that activated B cells and CD8+ T cells had higher infiltration in the low ERS score group, but higher infiltration of activated CD4+ T cells, activated dendritic cells, macrophages, and neutrophils in the high ERS score group. Drug sensitivity analysis indicated the low ERS score group had a better response to gemcitabine, paclitaxel, 5-fluorouracil, oxaliplatin, and irinotecan. RT-qPCR validated that MET, MUC16, and KRT7 in the model had higher expression levels in pancreatic tumour tissues. Single-cell analysis further revealed that MET, MUC16, and KRT7 were mainly expressed in cancer cells in PC tumour microenvironment. In all, we first constructed the ERS-related molecular subtypes and prognostic model in PC. Our research highlighted the vital role of ERS in PC and contributed to further research on molecular mechanisms and novel therapeutic strategies for PC in the future.
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Affiliation(s)
- Biao Zhang
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Xu Chen
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhizhou Wang
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Fangyue Guo
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Xiaonan Zhang
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Bingqian Huang
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Shurong Ma
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Shilin Xia
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Dong Shang
- Department of General Surgery, Clinical Laboratory of Integrative Medicine, The First Affiliated Hospital of Dalian Medical University, Dalian, China
- Institute (College) of Integrative Medicine, Dalian Medical University, Dalian, China
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Jiménez JA, Ptacek TS, Tuttle AH, Schmid RS, Moy SS, Simon JM, Zylka MJ. Chd8 haploinsufficiency impairs early brain development and protein homeostasis later in life. Mol Autism 2020; 11:74. [PMID: 33023670 PMCID: PMC7537101 DOI: 10.1186/s13229-020-00369-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 08/07/2020] [Indexed: 12/26/2022] Open
Abstract
Background Chromodomain helicase DNA-binding protein 8 (Chd8) is a high-confidence risk gene for autism spectrum disorder (ASD). However, how Chd8 haploinsufficiency impairs gene expression in the brain and impacts behavior at different stages of life is unknown. Methods We generated a mutant mouse line with an ASD-linked loss-of-function mutation in Chd8 (V986*; stop codon mutation). We examined the behavior of Chd8 mutant mice along with transcriptional changes in the cerebral cortex as a function of age, with a focus on one embryonic (E14.5) and three postnatal ages (1, 6, and 12 months). Results Chd8V986*/+ mutant mice displayed macrocephaly, reduced rearing responses and reduced center time in the open field, and enhanced social novelty preference. Behavioral phenotypes were more evident in Chd8V986*/+ mutant mice at 1 year of age. Pup survival was reduced in wild-type x Chd8V986*/+ crosses when the mutant parent was female. Transcriptomic analyses indicated that pathways associated with synaptic and neuronal projections and sodium channel activity were reduced in the cortex of embryonic Chd8V986*/+ mice and then equalized relative to wild-type mice in the postnatal period. At 12 months of age, expression of genes associated with endoplasmic reticulum (ER) stress, chaperone-mediated protein folding, and the unfolded protein response (UPR) were reduced in Chd8V986*/+ mice, whereas genes associated with the c-MET signaling pathway were increased in expression. Limitations It is unclear whether the transcriptional changes observed with age in Chd8V986*/+ mice reflect a direct effect of CHD8-regulated gene expression, or if CHD8 indirectly affects the expression of UPR/ER stress genes in adult mice as a consequence of neurodevelopmental abnormalities. Conclusions Collectively, these data suggest that UPR/ER stress pathways are reduced in the cerebral cortex of aged Chd8V986*/+ mice. Our study uncovers neurodevelopmental and age-related phenotypes in Chd8V986*/+ mice and highlights the importance of controlling for age when studying Chd8 haploinsufficient mice.
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Affiliation(s)
- Jessica A Jiménez
- Curriculum in Toxicology & Environmental Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Travis S Ptacek
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Alex H Tuttle
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Ralf S Schmid
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Sheryl S Moy
- Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Department of Psychiatry, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Jeremy M Simon
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Department of Genetics, The University of North Carolina at Chapel Hill, Campus Box #7264, Chapel Hill, NC, 27599, USA
| | - Mark J Zylka
- UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA. .,Carolina Institute for Developmental Disabilities, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA. .,Department of Cell Biology and Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
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TBHQ Alleviated Endoplasmic Reticulum Stress-Apoptosis and Oxidative Stress by PERK-Nrf2 Crosstalk in Methamphetamine-Induced Chronic Pulmonary Toxicity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4310475. [PMID: 28303170 PMCID: PMC5337881 DOI: 10.1155/2017/4310475] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/06/2017] [Accepted: 01/17/2017] [Indexed: 01/22/2023]
Abstract
Methamphetamine (MA) leads to cardiac and pulmonary toxicity expressed as increases in inflammatory responses and oxidative stress. However, some interactions may exist between oxidative stress and endoplasmic reticulum stress (ERS). The current study is designed to investigate if both oxidative stress and ERS are involved in MA-induced chronic pulmonary toxicity and if antioxidant tertiary butylhydroquinone (TBHQ) alleviated ERS-apoptosis and oxidative stress by PERK-Nrf2 crosstalk. In this study, the rats were randomly divided into control group, MA-treated group (MA), and MA plus TBHQ-treated group (MA + TBHQ). Chronic exposure to MA resulted in slower growth of weight and pulmonary toxicity of the rats by increasing the pulmonary arterial pressure, promoting the hypertrophy of right ventricle and the remodeling of pulmonary arteries. MA inhibited the Nrf2-mediated antioxidative stress by downregulation of Nrf2, GCS, and HO-1 and upregulation of SOD2. MA increased GRP78 to induce ERS. Overexpression and phosphorylation of PERK rapidly phosphorylated eIF2α, increased ATF4, CHOP, bax, caspase 3, and caspase 12, and decreased bcl-2. These changes can be reversed by antioxidant TBHQ through upregulating expression of Nrf2. The above results indicated that TBHQ can alleviate MA-induced oxidative stress which can accelerate ERS to initiate PERK-dependent apoptosis and that PERK/Nrf2 is likely to be the key crosstalk between oxidative stress and ERS in MA-induced chronic pulmonary toxicity.
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Roles of Grp78 in Female Mammalian Reproduction. ADVANCES IN ANATOMY, EMBRYOLOGY, AND CELL BIOLOGY 2017; 222:129-155. [PMID: 28389754 DOI: 10.1007/978-3-319-51409-3_7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The glucose-regulated protein (GRP78) also referred to as immunoglobulin heavy chain binding protein (Bip) is one of the best characterized endoplasmic reticulum (ER) chaperone proteins, which belongs to the heat-shock protein (HSP) family. GRP78 as a central regulator of ER stress (ERS) plays many important roles in cell survival and apoptosis through controlling the activation of transmembrane ERS sensors: PKR-like ER-associated kinase (PERK), inositol requiring kinase 1 (IRE1), and activating transcription factor 6 (ATF6). Many studies have reported that GRP78 is involved in the physiological and pathological process in female reproduction, including follicular development, corpus luteum (CL), oviduct, uterus, embryo, preimplantation development, implantation/decidualization, and the placenta. The present review summarizes the biological or pathological roles and signaling mechanisms of GRP78 during the reproductive processes. Further study on the functions and mechanisms of GRP78 may provide new insight into mammalian reproduction, which not only enhance the understanding of the physiological roles but also support therapy target against infertility.
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Sargis RM, Salgia R. Multiple Endocrine Disruption by the MET/ALK Inhibitor Crizotinib in Patients With Non-small Cell Lung Cancer. Am J Clin Oncol 2016; 38:442-7. [PMID: 23934135 DOI: 10.1097/coc.0b013e3182a46896] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVES Non-small cell lung cancer (NSCLC) is a heterogenous group of disorders that can be subclassified based upon molecular characterization. Anaplastic lymphoma kinase translocation and MET aberrations occur in a subset of NSCLC. Anaplastic lymphoma kinase/MET have been shown to be inhibited by the small molecule tyrosine kinase inhibitor crizotinib. Recently, crizotinib was shown to decrease testosterone in males. Herein, we describe the effects of crizotinib on multiple hormonal axes. MATERIALS AND METHODS Seven consecutive patients with NSCLC who were receiving crizotinib as part of their standard care were evaluated for hormonal disruptions. RESULTS Primary hypogonadism was detected in 4/5 of males, whereas mildly elevated prolactin was observed in 4/7 patients. Hypocalcemia was observed in 3/7 patients. Interestingly, 5/7 patients had elevated levels of insulin-like growth factor-1 (IGF-1) levels, and the remaining 2 individuals had levels that were near the upper limits of the normal range. CONCLUSIONS Because of cellular cross-talk between MET and IGF-1 signaling, elevated IGF-1 levels induced by crizotinib treatment may have implications for long-term drug efficacy. Furthermore, this finding suggests a potential avenue of therapeutic synergy, namely coordinate inhibition of the MET and IGF-1 signaling pathways. Finally, as crizotinib has been recently approved, it is prudent to check hormone and calcium biomarkers and correct noted deficiencies for improved outcomes and quality of life.
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Affiliation(s)
- Robert M Sargis
- *Section of Endocrinology, Diabetes, and Metabolism †Section of Hematology and Oncology, Department of Medicine, University of Chicago, Chicago, IL
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Hu J, Yin B. Advances in biomarkers of biliary tract cancers. Biomed Pharmacother 2016; 81:128-135. [PMID: 27261586 DOI: 10.1016/j.biopha.2016.02.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 02/16/2016] [Accepted: 02/16/2016] [Indexed: 12/14/2022] Open
Abstract
Tumor biomarkers can be applied for early diagnosis or precise treatment, thereby leading to personalized treatment and better outcomes. Biliary tract cancers (BTCs) are a group of cancers that occurs in different locations and have different clinical or genetic properties. Though the incidence of BTCs is rare, BTCs are among the most lethal cancers in the world and all have very low 5-year survivals. Lack of efficient early diagnostic approaches or adjuvant therapies for BTCs are main reasons. These urge us to broaden the researches into BTC biomarkers. Although few progresses of diagnostic biomarkers for BTCs have been achieved, there are still some advances in prognostic, predictive and therapeutic areas. In this review, we will focus on these achievements.
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Affiliation(s)
- Jun Hu
- Department of General Surgery, Huashan Hosptial, Fudan University, Shanghai 200040, PR China.
| | - Baobing Yin
- Department of General Surgery, Huashan Hosptial, Fudan University, Shanghai 200040, PR China; Department of General Surgery, Jing'an Branch of Huashan Hospital, Fudan University (Jing'an District Centre Hospital of Shanghai), Shanghai 200040, PR China.
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Zhang J, Babic A. Regulation of the MET oncogene: molecular mechanisms. Carcinogenesis 2016; 37:345-55. [PMID: 26905592 DOI: 10.1093/carcin/bgw015] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 01/29/2016] [Indexed: 12/26/2022] Open
Abstract
The MET oncogene is a predictive biomarker and an attractive therapeutic target for various cancers. Its expression is regulated at multiple layers via various mechanisms. It is subject to epigenetic modifications, i.e. DNA methylation and histone acetylation. Hypomethylation and acetylation of the MET gene have been associated with its high expression in some cancers. Multiple transcription factors including Sp1 and Ets-1 govern its transcription. After its transcription, METmRNA is spliced into multiple species in the nucleus before being transported to the cytoplasm where its translation is modulated by at least 30 microRNAs and translation initiation factors, e.g. eIF4E and eIF4B. METmRNA produces a single chain pro-Met protein of 170 kDa which is cleaved into α and β chains. These two chains are bound together through disulfide bonds to form a heterodimer which undergoes either N-linked or O-linked glycosylation in the Golgi apparatus before it is properly localized in the membrane. Upon interactions with its ligand, i.e. hepatocyte growth factor (HGF), the activity of Met kinase is boosted through various phosphorylation mechanisms and the Met signal is relayed to downstream pathways. The phosphorylated Met is then internalized for subsequent degradation or recycle via proteasome, lysosome or endosome pathways. Moreover, the Met expression is subject to autoregulation and activation by other EGFRs and G-protein coupled receptors. Since deregulation of the MET gene leads to cancer and other pathological conditions, a better understanding of the MET regulation is critical for Met-targeted therapeutics.
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Affiliation(s)
- Jack Zhang
- Research and Development, Ventana Medical Systems, Inc., a Member of the Roche Group, Oro Valley, AZ 85755, USA
| | - Andy Babic
- Research and Development, Ventana Medical Systems, Inc., a Member of the Roche Group, Oro Valley, AZ 85755, USA
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The roles of endoplasmic reticulum stress response in female mammalian reproduction. Cell Tissue Res 2015; 363:589-97. [PMID: 26022337 DOI: 10.1007/s00441-015-2212-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Accepted: 05/01/2015] [Indexed: 01/06/2023]
Abstract
Endoplasmic reticulum stress (ERS) activates a protective pathway, called the unfold protein response, for maintaining cellular homeostasis, but cellular apoptosis is triggered by excessive or persistent ERS. Several recent studies imply that the ERS response might have broader physiological roles in the various reproductive processes of female mammals, including embryo implantation, decidualization, preimplantation embryonic development, follicle atresia, and the development of the placenta. This review summarizes the existing data concerning the molecular and biological roles of the ERS response. The study of the functions of the ERS response in mammalian reproduction might provide novel insights into and an understanding of reproductive cell survival and apoptosis under physiological and pathological conditions. The ERS response is a novel signaling pathway for reproductive cell survival and apoptosis. Infertility might be a result of disturbing the ERS response during the process of female reproduction.
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Duan CY, Chen SK, Zhang CY, Feng CH, Liu YP, Xia XM, Yu WJ, Dai RY, Li H. Effect of N-linked glycosylation modification of pro-Met on function of c-Met. Shijie Huaren Xiaohua Zazhi 2014; 22:2826-2838. [DOI: 10.11569/wcjd.v22.i20.2826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
AIM: To investigate the effect of N-linked glycosylation modification of pro-Met on the function of c-Met in human hepatocellular carcinoma (HCC) cell line MHCC-97H and human cholangiocarcinoma cell line RBE.
METHODS: Tunicamycin (Tun), an inhibitor of N-glycosylation, MG132, a proteasome inhibitor, cycloheximide (CHX), a protein synthesis inhibitor, and PF-2341066, a c-Met inhibitor, were used in this study. The effect of N-linked glycosylation modification of pro-Met on c-Met function in MHCC-97H and RBE cells were determined by Western blot, immunofluorescence and confocal microscopy.
RESULTS: We found that both phosphatidylinositol 3 kinase/Akt (PI3K/Akt) and mitogen-activated protein kinase /extracellular signal-regulated kinase (MEK/ERK) were downstream to c-Met. Furthermore, c-Met was an N-linked glycosylated protein. N-glycosylation modification of p145Met was from pro-Met, but not due to the further modification of pro-Met. Importantly, blocking the N-glycosylation of pro-Met targeted pro-Met to the cytoplasm and initiated its phosphorylation independent of hepatocyte growth factor (HGF) engagement. Nonglycosylated pro-Met, which was phosphorylated, only in part activated c-Met downstream signals.
CONCLUSION: N-glycosylation is required for c-Met function.
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Feng C, He K, Zhang C, Su S, Li B, Li Y, Duan CY, Chen S, Chen R, Liu Y, Li H, Wei M, Xia X, Dai R. JNK contributes to the tumorigenic potential of human cholangiocarcinoma cells through the mTOR pathway regulated GRP78 induction. PLoS One 2014; 9:e90388. [PMID: 24587347 PMCID: PMC3938720 DOI: 10.1371/journal.pone.0090388] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 01/28/2014] [Indexed: 12/14/2022] Open
Abstract
Less is known about the roles of c-Jun N-terminal kinase (JNK) in cholangiocarcinoma (CCA). Here, we report that JNK exerts its oncogenic action in human CCA cells, partially due to the mammalian target of rapamycin (mTOR) pathway regulated glucose-regulated protein 78 (GRP78) induction. In human CCA cells, the phosphorylation of eukaryotic initiation factor alpha (eIF2α) results in the accumulation of activating transcription factor 4 (ATF4) and GRP78 independent of unfolded protein response (UPR). Suppression of GRP78 expression decreases the proliferation and invasion of human CCA cells. It's notable that mTOR is required for eIF2α phosphorylation-induced ATF4 and GRP78 expression. Importantly, JNK promotes eIF2α/ATF4-mediated GRP78 induction through regulating the activity of mTOR. Thus, our study implicates JNK/mTOR signaling plays an important role in cholangiocarcinogenesis, partially through promoting the eIF2α/ATF4/GRP78 pathway.
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Affiliation(s)
- Chunhong Feng
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
| | - Kai He
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
| | - Chunyan Zhang
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Song Su
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
| | - Bo Li
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
| | - Yuxiao Li
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Chun-Yan Duan
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Shaokun Chen
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Run Chen
- Department of Public Health, Luzhou Medical College, Luzhou, Sichuan, China
| | - Youping Liu
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Hong Li
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
| | - Mei Wei
- Affiliated Hospital of Chinese Traditional Medicine, Luzhou Medical College, Luzhou, Sichuan, China
| | - Xianming Xia
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
- * E-mail: (XMX); (RYD)
| | - Rongyang Dai
- Department of Hepatobiliary Surgery of the Affiliated Hospital, Luzhou Medical College, Luzhou, Sichuan, China
- Department of Biochemistry and Molecular Biology, Luzhou Medical College, Luzhou, Sichuan, China
- * E-mail: (XMX); (RYD)
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Chen R, Duan CY, Chen SK, Zhang CY, He T, Li H, Liu YP, Dai RY. The suppressive role of p38 MAPK in cellular vacuole formation. J Cell Biochem 2013; 114:1789-99. [PMID: 23444236 DOI: 10.1002/jcb.24522] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 02/12/2013] [Indexed: 12/25/2022]
Abstract
Vacuolization of the cytoplasm is one of the dramatic and frequently observed phenomena in various cell types. Cellular vacuoles occur spontaneously or via a wide range of inductive stimuli, but the molecular mechanism involved in this process remains largely unknown. In this study, we investigated the role of the p38 and JNK pathways in the formation of cytoplasmic vacuoles. We found that p38 and JNK agonist anisomycin abolishes spontaneous cytoplasmic vacuolization of HepG2 cells through p38 activation, but not through JNK activation. Importantly, blocking the activity of p38 or suppression the expression of p38 elicits cytoplasmic vacuoles formation in various cancer cells. Furthermore, cytoplasmic vacuoles induced by p38 blocking are derived from the perinuclear region. These observations provide direct evidence for a role of p38 signaling in regulating the formation of cytoplasmic vacuoles.
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Affiliation(s)
- Run Chen
- Department of Public Health of Luzhou Medical College, Luzhou, Sichuan, China
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Implication of transcriptional repression in compound C-induced apoptosis in cancer cells. Cell Death Dis 2013; 4:e883. [PMID: 24157877 PMCID: PMC3920957 DOI: 10.1038/cddis.2013.419] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/14/2013] [Accepted: 09/17/2013] [Indexed: 12/25/2022]
Abstract
Compound C, a well-known inhibitor of AMP-activated protein kinase (AMPK), has been reported to induce apoptosis in some types of cells. However, the underlying mechanisms remain largely unclear. Using a DNA microarray analysis, we found that the expression of many genes was downregulated upon treatment with compound C. Importantly, compound C caused transcriptional repression with the induction of p53, a well-known marker of transcriptional stress response, in several cancer cell lines. Compound C did not induce the phosphorylation of p53 but dramatically increased the protein level of p53 similar to some other transcriptional inhibitors, including 5,6-dichloro-1-β-D-ribobenzimidazole (DRB). Consistent with previous reports, we found that compound C initiated apoptotic death of cancer cells in an AMPK-independent manner. Similar to DRB and actinomycin D (ActD), two classic transcription inhibitors, compound C not only resulted in the loss of Bcl-2 and Bcl-xl protein but also induced the phosphorylation of eukaryotic initiation factor-alpha (eIF2α) on Ser51. Hence, the phosphorylation of eIF2α might be a novel marker of transcriptional inhibition. It is noteworthy that compound C-mediated apoptosis of cancer cells is correlated with decreased expression of Bcl-2 and Bcl-xl and the phosphorylation of eIF2α on Ser51. Remarkably, compound C exhibits potent anticancer activities in vivo. Taken together, our data suggest that compound C may be an attractive candidate for anticancer drug development.
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Stamou M, Streifel KM, Goines PE, Lein PJ. Neuronal connectivity as a convergent target of gene × environment interactions that confer risk for Autism Spectrum Disorders. Neurotoxicol Teratol 2013; 36:3-16. [PMID: 23269408 PMCID: PMC3610799 DOI: 10.1016/j.ntt.2012.12.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 11/12/2012] [Accepted: 12/17/2012] [Indexed: 11/21/2022]
Abstract
Evidence implicates environmental factors in the pathogenesis of Autism Spectrum Disorders (ASD). However, the identity of specific environmental chemicals that influence ASD risk, severity or treatment outcome remains elusive. The impact of any given environmental exposure likely varies across a population according to individual genetic substrates, and this increases the difficulty of identifying clear associations between exposure and ASD diagnoses. Heritable genetic vulnerabilities may amplify adverse effects triggered by environmental exposures if genetic and environmental factors converge to dysregulate the same signaling systems at critical times of development. Thus, one strategy for identifying environmental risk factors for ASD is to screen for environmental factors that modulate the same signaling pathways as ASD susceptibility genes. Recent advances in defining the molecular and cellular pathology of ASD point to altered patterns of neuronal connectivity in the developing brain as the neurobiological basis of these disorders. Studies of syndromic ASD and rare highly penetrant mutations or CNVs in ASD suggest that ASD risk genes converge on several major signaling pathways linked to altered neuronal connectivity in the developing brain. This review briefly summarizes the evidence implicating dysfunctional signaling via Ca(2+)-dependent mechanisms, extracellular signal-regulated kinases (ERK)/phosphatidylinositol-3-kinases (PI3K) and neuroligin-neurexin-SHANK as convergent molecular mechanisms in ASD, and then discusses examples of environmental chemicals for which there is emerging evidence of their potential to interfere with normal neuronal connectivity via perturbation of these signaling pathways.
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Affiliation(s)
- Marianna Stamou
- Department of Molecular Biosciences, University of California at Davis School of Veterinary Medicine, Davis CA, 95616, United States
| | - Karin M. Streifel
- Department of Molecular Biosciences, University of California at Davis School of Veterinary Medicine, Davis CA, 95616, United States
| | - Paula E. Goines
- Department of Molecular Biosciences, University of California at Davis School of Veterinary Medicine, Davis CA, 95616, United States
| | - Pamela J. Lein
- Department of Molecular Biosciences, University of California at Davis School of Veterinary Medicine, Davis CA, 95616, United States
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Chen R, Li J, Feng CH, Chen SK, Liu YP, Duan CY, Li H, Xia XM, He T, Wei M, Dai RY. c-Met function requires n-linked glycosylation modification of pro-Met. J Cell Biochem 2013; 114:816-22. [DOI: 10.1002/jcb.24420] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 10/01/2012] [Indexed: 12/22/2022]
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Dai R, Li J, Fu J, Chen Y, Wang R, Zhao X, Luo T, Zhu J, Ren Y, Cao J, Qian Y, Li N, Wang H. The tyrosine kinase c-Met contributes to the pro-tumorigenic function of the p38 kinase in human bile duct cholangiocarcinoma cells. J Biol Chem 2012; 287:39812-23. [PMID: 23024367 DOI: 10.1074/jbc.m112.406520] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Pro-tumorigenic function of the p38 kinase plays a critical role in human cholangiocarcinogenesis. However, the underlying mechanism remains incompletely understood. Here, we report that c-Met, the tyrosine kinase receptor for hepatocyte growth factor (HGF), contributes to the pro-tumorigenic ability of p38 in human cholangiocarcinoma cells. Both p38 and c-Met promote the proliferation and invasion of human cholangiocarcinoma cells. Importantly, inhibition or knockdown of p38 decreased the basal activation of c-Met. Tyrosine phosphatase inhibitor studies revealed that p38 promotes the activity of c-Met, at least in part, by inhibiting dephosphorylation of the receptor. Moreover, density enhanced phosphatase-1 (DEP-1) is involved in p38-mediated inhibiting dephosphorylation of c-Met. Furthermore, p38 inhibits the degradation of c-Met. Taken together, these data provide a potential mechanism to explain how p38 promotes human cholangiocarcinoma cell proliferation and invasion. We propose that the link between p38 and c-Met is implicated in the progression of human cholangiocarcinoma.
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Affiliation(s)
- Rongyang Dai
- International Cooperation Laboratory on Signal Transduction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai 200438
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