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Li M, Yu J, Deng H, Xie S, Li Q, Zhao Y, Yin S, Ji YF. Upregulation of glutamate transporter 1 by mTOR/Akt pathway in astrocyte culture during oxygen-glucose deprivation and reoxygenation. Exp Brain Res 2023; 241:201-209. [PMID: 36436003 DOI: 10.1007/s00221-022-06514-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 11/16/2022] [Indexed: 11/28/2022]
Abstract
Astrocyte-specific glutamate transporter subtype 1 (GLT-1) plays an important role in influencing glutamate excitatory toxicity and preventing the death of excitatory toxic neurons. Although the mammalian target of rapamycin (mTOR)/protein kinase B(Akt)/nuclear factor kappa B signaling cascade is involved in the upregulation of astrocytic GLT-1 in oxygen-glucose deprivation (OGD), it is unclear whether the mTOR/Akt pathway is involved in astrocytic GLT-1 upregulation in OGD and reoxygenation (OGD/R). In this study, we found that the treatment of cultured astrocytes with rapamycin and triciribine led to the decreased astrocytes' protrusions, smaller nuclei, and an increased apoptotic rate. The inhibitors of mTOR complex 1 significantly increased the expression levels of phosphorylated Akt-Ser473 (p-Akt), phosphorylated Akt-Thr308(p-Akt), and GLT-1, while Akt-specific inhibitors blocked GLT-1 expression, suggesting that the mTOR/Akt pathway is involved in GLT-1 upregulation. We further demonstrated that astrocytes under OGD/R adapted to environmental changes through the mTOR/Akt pathway, mainly by altering cell morphology and apoptosis and upregulating the expression levels of p-Akt and GLT-1. Our results suggested that astrocytes may adapt to short-term ischemic-reperfusion injury by regulating cell morphology, apoptosis and GLT-1 upregulation.
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Affiliation(s)
- Mi Li
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
- Department of Neurology, Yilong County People's Hospital, Nanchong, Sichuan, People's Republic of China
| | - Jingmei Yu
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Huan Deng
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Shansha Xie
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Qiuling Li
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Yuping Zhao
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Shubin Yin
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
| | - Yi-Fei Ji
- Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China.
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Wu T, Qian TY, Lin RJ, Jin DD, Xu XB, Huang MX, Ji J, Jiang F, Pan LL, Luo L, Ji YF, Chen QL, Xiao MB. Construction and validation of a m6A RNA methylation and ferroptosis-related prognostic model for pancreatic cancer by integrated bioinformatics analysis. J Gastrointest Oncol 2022; 13:2553-2564. [PMID: 36388690 PMCID: PMC9660081 DOI: 10.21037/jgo-22-941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022] Open
Abstract
Background Both N6-methyladenosine (m6A) ribonucleic acid (RNA) methylation and ferroptosis regulators are demonstrated to have significant effects on the malignant clinicopathological characteristics of pancreatic adenocarcinoma (PAAD) patients. However, the currently available clinical indexes are not sufficient to predict precise prognostic outcomes pf PAAD patients accurately. This study aims to examine the clinicopathologic features of m6A RNA methylation and ferroptosis regulators in predicting the outcomes of different types of cancer. Methods As the foundation for this research, the differentially expressed genes (DEGs) between PAAD tissues and adjacent normal tissues were first identified. Next, dimensional reduction analysis (DCA) based on m6A RNA methylation regulators and ferroptosis regulators were performed and DEGs between good/poor prognosis PAAD patient clusters were identified. DEGs were then screened by Cox analysis, and finally a risk signature was established by least absolute shrinkage and selection operator (LASSO) analyses. The prediction model based on risk score was further evaluated by a validation set from Gene Expression Omnibus (GEO) database. Results In total, 4 m6A RNA methylation regulator genes and 29 ferroptosis regulator genes were found to have close causal relationships with the prognosis of PAAD, and a risk score with 3 m6A methylation regulators (i.e., IGF2BP2, IGF2BP3, and METTL16) and 4 ferroptosis regulators (i.e., ENPP2, ATP6V1G2, ITGB4, and PROM2) was constructed and showed to be highly involved in PAAD progression and could serve as effective markers for prognosis with AUC value equaled 0.753 in training set and 0.803 in validation set. Conclusions The combined prediction model, composed of seven regulators of m6A methylation and ferroptosis, in this study more effectively reflects the progression and prognosis of PAAD than previous single genome or epigenetic analysis. Our study provides a broader perspective for the subsequent establishment of prognostic models and the patients may benefit from more precision management.
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Affiliation(s)
- Tong Wu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Tian-Yang Qian
- First School of Clinical Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Ren-Jie Lin
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Dan-Dan Jin
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Xue-Bin Xu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Meng-Xiang Huang
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Jie Ji
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Feng Jiang
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Ling-Ling Pan
- Department of Science and Technology, Affiliated Hospital of Nantong University, Nantong, China
| | - Lan Luo
- Department of Geriatrics, Affiliated Hospital of Nantong University, Nantong, China
| | - Yi-Fei Ji
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Qiao-Lan Chen
- Department of Science and Education, Affiliated Dongtai People’s Hospital of Nantong University, Yancheng, China
| | - Ming-Bing Xiao
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
- Department of Science and Technology, Affiliated Hospital of Nantong University, Nantong, China
- Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong, China
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Zhou W, Li SY, Li J, Kong XY, Zhao B, Ji YF, Jin ZD, Wang KX. Comparison of full-field optical coherence tomography imaging for pancreatic tissue sample obtained by EUS-fine-needle biopsy and conventional histological examination: A study protocol for a prospective trial. Endosc Ultrasound 2020; 9:380-384. [PMID: 32952130 PMCID: PMC7811711 DOI: 10.4103/eus.eus_27_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
For a definitive diagnosis of fine-needle aspiration (FNA)/biopsy, one of the reliable techniques to determine the adequacy and accuracy rapid on-site evaluation (ROSE) of cytological samples is preferable. Because of the lack of trained pathologists, alternatives have to be explored. This study is primarily conducted to determine the diagnostic sensitivity and specificity of full-field optical coherence tomography (FF-OCT) and secondarily to evaluate the possibility of FF-OCT differentiating different types of pancreatic diseases. The diagnostic coherence of FF-OCT by a trained assistant (endoscopist) and trained pathologist is also compared. This is a single-center, prospective, observation trial. Eighty patients would be enrolled in the study. The tissue samples acquired by endoscopic ultrasound fine-needle biopsy (EUS-FNB) would be imaged by the FF-OCT system, interpreted by a trained endoscopist and a pathologist. The results of the image interpretation would be verified with histological findings. This study determines the diagnostic capability of FF-OCT as a ROSE technique while performing EUS-FNB, and whether endoscopists can implement the assessment.
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Affiliation(s)
- Wei Zhou
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Shi-Yu Li
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Jun Li
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Xiang-Yu Kong
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Bo Zhao
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Yi-Fei Ji
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, Nantong, Jiangsu, China
| | - Zhen-Dong Jin
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
| | - Kai-Xuan Wang
- Department of Gastroenterology, Changhai Hospital, Second Military Medical University/Naval Medical University, Shanghai, China
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Yang JJ, Huang H, Xiao MB, Jiang F, Ni WK, Ji YF, Lu CH, Ni RZ. Sex comb on midleg like-2 is a novel specific marker for the diagnosis of gastroenteropancreatic neuroendocrine tumors. Exp Ther Med 2017; 14:1749-1755. [PMID: 28810646 DOI: 10.3892/etm.2017.4677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 04/21/2017] [Indexed: 12/14/2022] Open
Abstract
Sex comb on midleg like-2 (SCML2) is a polycomb-group protein that encodes transcriptional repressors essential for appropriate development in the fly and in mammals. On the basis of previous findings, the present study aimed to explore the possibility of developing SCML2 into a new diagnostic marker for gastroenteropancreatic neuroendocrine tumors (GEP-NETs). A total of 64 paired GEP-NET tissues and adjacent non-tumorous tissues were obtained from patients who had undergone surgical resection between January 2009 and January 2014, and the expression of SCML2 and two neuroendocrine markers, namely synaptophysin (Syn) and chromogranin A (CgA), in the tissues was assessed by immunohistochemistry. Strong SCML2 staining was observed predominantly in the cell nuclei of GEP-NET tissues, and the overall expression rate and staining intensity of SCML2 were higher than those of Syn or CgA, respectively. Spearman rank correlation analysis demonstrated that SCML2 was not correlated with either Syn or CgA, while the combined detection of SCML2 with Syn or with CgA increased the diagnostic sensitivity to 100%. SCML2 expression in GEP-NETs was associated with several clinicopathological parameters, such as histological type, tumor grade, depth of invasion and clinical stage. Kaplan-Meier survival curves revealed that patients with higher SCML2 expression had lower survival rates than those with lower expression levels, while Cox proportional hazards regression analysis revealed that SCML2 was not an independent prognostic factor for GEP-NET patients. Therefore, SCML2 may have potential as a specific marker for joint use with other markers to improve the diagnostic efficiency of GEP-NETs.
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Affiliation(s)
- Jiao-Jiao Yang
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Hua Huang
- Department of Pathology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Ming-Bing Xiao
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Feng Jiang
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Wen-Kai Ni
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Yi-Fei Ji
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Cui-Hua Lu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Run-Zhou Ni
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
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Ji YF, Liu J, Yin RR, Chen X, Jin DL. [Arytenoid dislocation after trachea foreign body surgery: one case report]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:811-812. [PMID: 29771053 DOI: 10.13201/j.issn.1001-1781.2017.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Indexed: 11/12/2022]
Abstract
One case of arytenoids dislocation after removal of a foreign body from the trachea was reported. After operation, throat pain, hoarseness and laborious speech, arytenoids dislocation was revealed by electronic laryngoscopy.
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Ji YF, Huang H, Jiang F, Ni RZ, Xiao MB. S100 family signaling network and related proteins in pancreatic cancer (Review). Int J Mol Med 2014; 33:769-76. [PMID: 24481067 DOI: 10.3892/ijmm.2014.1633] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 01/20/2014] [Indexed: 11/06/2022] Open
Abstract
The occurrence and development of pancreatic cancer is a complex process convoluted by multi-pathogenies, multi-stages and multi-factors. S100 proteins are members of the S100 family that regulate multiple cellular pathways related to pancreatic cancer progression and metastasis. S100 proteins have a broad range of intracellular and extracellular functions, including the regulation of protein phosphorylation and enzyme activity, calcium homeostasis and the regulation of cytoskeletal components and transcriptional factors. S100 proteins interact with receptor for advanced glycation end-products (RAGE), p53 and p21, which play a role in the degradation of the extracellular matrix (ECM) and metastasis, and also interact with cytoskeletal proteins and the plasma membrane in pancreatic cancer progression and metastasis. S100A11 and S100P are significant tumor markers for pancreatic cancer and unfavorable predictors for the prognosis of patients who have undergone surgical resection. Recently, S100A2 has been suggested to be a negative prognostic biomarker in pancreatic cancer, and the expression of S100A6 may be an independent prognostic impact factor. The expression of S100A4 and S100P is associated with drug resistance, differentiation, metastasis and clinical outcome. This review summarizes the role and significance of the S100 family signaling network and related proteins in pancreatic cancer.
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Affiliation(s)
- Yi-Fei Ji
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Hua Huang
- Department of Pathology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Feng Jiang
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Run-Zhou Ni
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
| | - Ming-Bing Xiao
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
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Li JF, Huang ZT, Zhang RQ, Zeng FX, Jiang M, Ji YF. Superposed pulse amplitude modulation for visible light communication. Opt Express 2013; 21:31006-31011. [PMID: 24514674 DOI: 10.1364/oe.21.031006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We propose and experimentally demonstrate a novel modulation scheme called superposed pulse amplitude modulation (SPAM) which is low-cost, insensitive to non-linearity of light emitting diode (LED). Multiple optical pulses transmit parallelly from different spatial position in the LED array and overlap linearly in free space to realize SPAM. With LED arrangement, the experimental results show that using the modulation we proposed the data rate of 120 Mbit/s with BER 1 × 10(-3) can be achieved with an optical blue filter and RC post-equalization.
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Ji YF, Zhou L, Xie YJ, Xu SM, Zhu J, Teng P, Shao CY, Wang Y, Luo JH, Shen Y. Upregulation of glutamate transporter GLT-1 by mTOR-Akt-NF-кB cascade in astrocytic oxygen-glucose deprivation. Glia 2013; 61:1959-75. [PMID: 24108520 DOI: 10.1002/glia.22566] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 07/24/2013] [Accepted: 07/30/2013] [Indexed: 01/13/2023]
Abstract
Excessive extracellular glutamate leads to neuronal death in central nervous system. Excitatory glutamate transporter subtype 2 (GLT-1) carries bulk of glutamate reuptake in cerebral ischemia. Although GLT-1 expression fluctuates during the period of ischemia, little is known about its regulatory mechanism. Here we show an up-regulation of GLT-1 via mammalian target of rapamycin (mTOR)-Akt-nuclear factor-кB (NF-кB) signaling cascade in oxygen glucose deprivation (OGD). We found that brief rapamycin treatment significantly increased GLT-1 expression in cultured astrocytes. Rapamycin increased phosphorylation of raptor at Ser792 and decreased phosphorylation of rictor at Thr1135, suggesting that both mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2) are involved in GLT-1 expression. This conclusion was further confirmed by raptor and rictor disruption experiments. Akt was activated by mTORC1 inhibition and required for GLT-1 expression because triciribine, a specific inhibitor of Akt, blocked the increase of GLT-1 expression. mTOR-Akt cascade then activated NF-кB and increased кB-motif-binding phosphoprotein (KBBP) expression and GLT-1 transcription. We next demonstrated that mTOR-Akt-NF-кB cascade was activated in OGD and subsequently caused the upregulation of GLT-1. Supporting evidence included: (1) inhibition of Akt or NF-кB occluded OGD-induced GLT-1 upregulation; (2) Raptor knock-down plus OGD did not add to the increase of GLT-1 expression; (3) Intact mTORC2 was required for GLT-1 enhancement. In summary, our data first showed that mTOR-Akt-NF-кB cascade played critical roles to up-regulate GLT-1 in OGD. This signaling cascade may work to promote glutamate uptake in brain ischemia and neurodegenerative diseases.
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Affiliation(s)
- Yi-Fei Ji
- Department of Neurobiology, Key Laboratory of Medical Neurobiology of Ministry of Health of China, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang, People's Republic of China; Department of Neurology, Second Clinical College, North Sichuan Medical College, Nanchong, Sichuan, People's Republic of China
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