1
|
Kong S, Chen TX, Jia XL, Cheng XL, Zeng ML, Liang JY, He XH, Yin J, Han S, Liu WH, Fan YT, Zhou T, Liu YM, Peng BW. Cell-specific NFIA upregulation promotes epileptogenesis by TRPV4-mediated astrocyte reactivity. J Neuroinflammation 2023; 20:247. [PMID: 37880726 PMCID: PMC10601220 DOI: 10.1186/s12974-023-02909-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Accepted: 09/26/2023] [Indexed: 10/27/2023] Open
Abstract
BACKGROUND The astrocytes in the central nervous system (CNS) exhibit morphological and functional diversity in brain region-specific pattern. Functional alterations of reactive astrocytes are commonly present in human temporal lobe epilepsy (TLE) cases, meanwhile the neuroinflammation mediated by reactive astrocytes may advance the development of hippocampal epilepsy in animal models. Nuclear factor I-A (NFIA) may regulate astrocyte diversity in the adult brain. However, whether NFIA endows the astrocytes with regional specificity to be involved in epileptogenesis remains elusive. METHODS Here, we utilize an interference RNA targeting NFIA to explore the characteristics of NFIA expression and its role in astrocyte reactivity in a 4-aminopyridine (4-AP)-induced seizure model in vivo and in vitro. Combined with the employment of a HA-tagged plasmid overexpressing NFIA, we further investigate the precise mechanisms how NIFA facilitates epileptogenesis. RESULTS 4-AP-induced NFIA upregulation in hippocampal region is astrocyte-specific, and primarily promotes detrimental actions of reactive astrocyte. In line with this phenomenon, both NFIA and vanilloid transient receptor potential 4 (TRPV4) are upregulated in hippocampal astrocytes in human samples from the TLE surgical patients and mouse samples with intraperitoneal 4-AP. NFIA directly regulates mouse astrocytic TRPV4 expression while the quantity and the functional activity of TRPV4 are required for 4-AP-induced astrocyte reactivity and release of proinflammatory cytokines in the charge of NFIA upregulation. NFIA deficiency efficiently inhibits 4-AP-induced TRPV4 upregulation, weakens astrocytic calcium activity and specific astrocyte reactivity, thereby mitigating aberrant neuronal discharges and neuronal damage, and suppressing epileptic seizure. CONCLUSIONS Our results uncover the critical role of NFIA in astrocyte reactivity and illustrate how epileptogenic brain injury initiates cell-specific signaling pathway to dictate the astrocyte responses.
Collapse
Affiliation(s)
- Shuo Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xiang-Lei Jia
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xue-Lei Cheng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jing-Yi Liang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xiao-Hua He
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jun Yin
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Song Han
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Wan-Hong Liu
- Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Yuan-Teng Fan
- Department of Neurology, Zhongnan Hospital, Wuhan University, Donghu Road 169#, Wuhan, 430071, China
| | - Ting Zhou
- Department of Neurology, People's Hospital of Dongxihu District, Wuhan, 430040, Hubei, China
| | - Yu-Min Liu
- Department of Neurology, Zhongnan Hospital, Wuhan University, Donghu Road 169#, Wuhan, 430071, China.
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China.
| |
Collapse
|
2
|
Sibener LJ, Mosberger AC, Chen TX, Athalye VR, Murray JM, Costa RM. Dissociable roles of thalamic nuclei in the refinement of reaches to spatial targets. bioRxiv 2023:2023.09.20.558560. [PMID: 37790555 PMCID: PMC10542479 DOI: 10.1101/2023.09.20.558560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Reaches are complex movements that are critical for survival, and encompass the control of different aspects such as direction, speed, and endpoint precision. Complex movements have been postulated to be learned and controlled through distributed motor networks, of which the thalamus is a highly connected node. Still, the role of different thalamic circuits in learning and controlling specific aspects of reaches has not been investigated. We report dissociable roles of two distinct thalamic nuclei - the parafascicular (Pf) and ventroanterior/ventrolateral (VAL) nuclei - in the refinement of spatial target reaches in mice. Using 2-photon calcium imaging in a head-fixed joystick task where mice learned to reach to a target in space, we found that glutamatergic neurons in both areas were most active during reaches early in learning. Reach-related activity in both areas decreased late in learning, as movement direction was refined and reaches increased in accuracy. Furthermore, the population dynamics of Pf, but not VAL, covaried in different subspaces in early and late learning, but eventually stabilized in late learning. The neural activity in Pf, but not VAL, encoded the direction of reaches in early but not late learning. Accordingly, bilateral lesions of Pf before, but not after learning, strongly and specifically impaired the refinement of reach direction. VAL lesions did not impact direction refinement, but instead resulted in increased speed and target overshoot. Our findings provide new evidence that the thalamus is a critical motor node in the learning and control of reaching movements, with specific subnuclei controlling distinct aspects of the reach early in learning.
Collapse
|
3
|
Tang J, Hu JZ, Chen YL, Zhao TT, Chen TX, Hu CG. Two new dihydro- β-agarofuran sesquiterpenes from the roots of Celastrus angulatus. J Asian Nat Prod Res 2023; 25:748-755. [PMID: 36355831 DOI: 10.1080/10286020.2022.2144261] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/01/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
Two new dihydro-β-agarofuran sesquiterpenes chiapen T (1) and chiapen U (2), along with chiapen A (3), 1β-hydroxy-2β,6α,12-triacetoxy-8β-(β-nicotinoyloxy)-9β-(benzoyloxy)-β-dihydroagarofuran (4), wilforlide B (5), 3-hydroxy-2-oxo-3-friedelen-29-oic acid (6), epikatonic acid (7), 22-epi-maytenfolic acid (8), maytenoic acid (9), wilforic acid F (10), wilforic acid B (11), were reported for the first time from the Celastrus angulatus. The structures of all the compounds were elucidated by HR-ESI-MS, 1 D and 2 D NMR spectra, as well as single-crystal X-ray diffraction analyses. Compounds 1 and 2 were examined for anti-inflammatory activity, respectively. None of them showed potent activity.
Collapse
Affiliation(s)
- Juan Tang
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Jia-Zhen Hu
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Yan-Ling Chen
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
- Guizhou Institute of Prataculture, Guizhou Academy of Agricultural Sciences, Guiyang 550025, China
| | - Ting-Ting Zhao
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Tao-Xiang Chen
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Cheng-Gang Hu
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| |
Collapse
|
4
|
Mosberger AC, Sibener LJ, Chen TX, Rodrigues H, Hormigo R, Ingram JN, Athalye VR, Tabachnik T, Wolpert DM, Murray JM, Costa RM. Exploration biases how forelimb reaches to a spatial target are learned. bioRxiv 2023:2023.05.08.539291. [PMID: 37214823 PMCID: PMC10197595 DOI: 10.1101/2023.05.08.539291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The brain can learn to generate actions, such as reaching to a target, using different movement strategies. Understanding how different variables bias which strategies are learned to produce such a reach is important for our understanding of the neural bases of movement. Here we introduce a novel spatial forelimb target task in which perched head-fixed mice learn to reach to a circular target area from a set start position using a joystick. These reaches can be achieved by learning to move into a specific direction or to a specific endpoint location. We find that mice gradually learn to successfully reach the covert target. With time, they refine their initially exploratory complex joystick trajectories into controlled targeted reaches. The execution of these controlled reaches depends on the sensorimotor cortex. Using a probe test with shifting start positions, we show that individual mice learned to use strategies biased to either direction or endpoint-based movements. The degree of endpoint learning bias was correlated with the spatial directional variability with which the workspace was explored early in training. Furthermore, we demonstrate that reinforcement learning model agents exhibit a similar correlation between directional variability during training and learned strategy. These results provide evidence that individual exploratory behavior during training biases the control strategies that mice use to perform forelimb covert target reaches.
Collapse
|
5
|
Zeng ML, Kong S, Chen TX, Peng BW. Transient Receptor Potential Vanilloid 4: a Double-Edged Sword in the Central Nervous System. Mol Neurobiol 2023; 60:1232-1249. [PMID: 36434370 DOI: 10.1007/s12035-022-03141-6] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 11/17/2022] [Indexed: 11/26/2022]
Abstract
Transient receptor potential vanilloid 4 (TRPV4) is a nonselective cation channel that can be activated by diverse stimuli, such as heat, mechanical force, hypo-osmolarity, and arachidonic acid metabolites. TRPV4 is widely expressed in the central nervous system (CNS) and participates in many significant physiological processes. However, accumulative evidence has suggested that deficiency, abnormal expression or distribution, and overactivation of TRPV4 are involved in pathological processes of multiple neurological diseases. Here, we review the latest studies concerning the known features of this channel, including its expression, structure, and its physiological and pathological roles in the CNS, proposing an emerging therapeutic strategy for CNS diseases.
Collapse
Affiliation(s)
- Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, Taikang Medical School (School of Basic Medical Sciences), Wuhan University, Donghu Rd185#, Wuhan, 430071, Hubei, China.,Medical Science Research Center, Zhongnan Hospital of Wuhan University, Wuhan, 430071, China
| | - Shuo Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, Taikang Medical School (School of Basic Medical Sciences), Wuhan University, Donghu Rd185#, Wuhan, 430071, Hubei, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, Taikang Medical School (School of Basic Medical Sciences), Wuhan University, Donghu Rd185#, Wuhan, 430071, Hubei, China
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, Taikang Medical School (School of Basic Medical Sciences), Wuhan University, Donghu Rd185#, Wuhan, 430071, Hubei, China.
| |
Collapse
|
6
|
Chen TX, Fan YT, Peng BW. Distinct mechanisms underlying therapeutic potentials of CD20 in neurological and neuromuscular disease. Pharmacol Ther 2022; 238:108180. [DOI: 10.1016/j.pharmthera.2022.108180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/16/2022] [Accepted: 03/28/2022] [Indexed: 10/18/2022]
|
7
|
Affiliation(s)
- W R Wei
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Sciences, China West Normal University, Nanchong, China
| | - H L Yue
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Sciences, China West Normal University, Nanchong, China
| | - Y X Nie
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Sciences, China West Normal University, Nanchong, China
| | - T X Chen
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), College of Life Sciences, China West Normal University, Nanchong, China
| |
Collapse
|
8
|
Chen TX, Pinharanda A, Steinemann NA, Yasuma-Mitobe K, Lee E, Hahn J, Wu L, Fanourakis S, Peterka DS, Hillman EMC. Evaluation of at-home methods for N95 filtering facepiece respirator decontamination. Sci Rep 2021; 11:19750. [PMID: 34611228 PMCID: PMC8492771 DOI: 10.1038/s41598-021-99129-8] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 09/14/2021] [Indexed: 11/17/2022] Open
Abstract
N95 filtering facepiece respirators (FFRs) are essential for the protection of healthcare professionals and other high-risk groups against Coronavirus Disease of 2019 (COVID-19). In response to shortages in FFRs during the ongoing COVID-19 pandemic, the Food and Drug Administration issued an Emergency Use Authorization permitting FFR decontamination and reuse. However, although industrial decontamination services are available at some large institutions, FFR decontamination is not widely accessible. To be effective, FFR decontamination must (1) inactivate the virus; (2) preserve FFR integrity, specifically fit and filtering capability; and (3) be non-toxic and safe. Here we identify and test at-home heat-based methods for FFR decontamination that meet these requirements using common household appliances. Our results identify potential protocols for simple and accessible FFR decontamination, while also highlighting unsuitable methods that may jeopardize FFR integrity.
Collapse
Affiliation(s)
- T X Chen
- Mortimer B. Zuckerman Mind Brain Behavior Institute, New York, NY, 10027, USA
| | - A Pinharanda
- Department of Biological Sciences, Columbia University, New York, NY, 10027, USA
| | - N A Steinemann
- Mortimer B. Zuckerman Mind Brain Behavior Institute, New York, NY, 10027, USA
| | - K Yasuma-Mitobe
- Department of Microbiology and Immunology, Columbia University, New York, NY, 10032, USA
| | - E Lee
- Columbia College, Columbia University, New York, NY, 10032, USA
| | - J Hahn
- Department of Biomedical Engineering, Columbia University, New York, NY, 10027, USA
| | - L Wu
- Columbia College, Columbia University, New York, NY, 10032, USA
| | - S Fanourakis
- Environmental Health and Safety, Columbia University, New York, NY, 10032, USA
| | - D S Peterka
- Mortimer B. Zuckerman Mind Brain Behavior Institute, New York, NY, 10027, USA.
| | - E M C Hillman
- Mortimer B. Zuckerman Mind Brain Behavior Institute, New York, NY, 10027, USA.
- Department of Biomedical Engineering, Columbia University, New York, NY, 10027, USA.
- Department of Radiology, Columbia University, New York, NY, 10027, USA.
| |
Collapse
|
9
|
Jiang GT, Shao L, Kong S, Zeng ML, Cheng JJ, Chen TX, Han S, Yin J, Liu WH, He XH, Liu YM, Gongga L, Peng BW. Complement C3 Aggravates Post-epileptic Neuronal Injury Via Activation of TRPV1. Neurosci Bull 2021; 37:1427-1440. [PMID: 34309810 DOI: 10.1007/s12264-021-00750-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 10/08/2020] [Accepted: 04/07/2021] [Indexed: 02/05/2023] Open
Abstract
Epilepsy is a brain condition characterized by the recurrence of unprovoked seizures. Recent studies have shown that complement component 3 (C3) aggravate the neuronal injury in epilepsy. And our previous studies revealed that TRPV1 (transient receptor potential vanilloid type 1) is involved in epilepsy. Whether complement C3 regulation of neuronal injury is related to the activation of TRPV1 during epilepsy is not fully understood. We found that in a mouse model of status epilepticus (SE), complement C3 derived from astrocytes was increased and aggravated neuronal injury, and that TRPV1-knockout rescued neurons from the injury induced by complement C3. Circular RNAs are abundant in the brain, and the reduction of circRad52 caused by complement C3 promoted the expression of TRPV1 and exacerbated neuronal injury. Mechanistically, disorders of neuron-glia interaction mediated by the C3-TRPV1 signaling pathway may be important for the induction of neuronal injury. This study provides support for the hypothesis that the C3-TRPV1 pathway is involved in the prevention and treatment of neuronal injury and cognitive disorders.
Collapse
Affiliation(s)
- Guang-Tong Jiang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Lin Shao
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Shuo Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Jing-Jing Cheng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Song Han
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Jun Yin
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Wan-Hong Liu
- Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Xiao-Hua He
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Yu-Min Liu
- Department of Neurology, Zhongnan Hospital, Wuhan University, Wuhan, 430071, China
| | - Lanzi Gongga
- Medical College, Tibet University, Lhasa, 850013, China
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China.
| |
Collapse
|
10
|
Shao L, Jiang GT, Yang XL, Zeng ML, Cheng JJ, Kong S, Dong X, Chen TX, Han S, Yin J, Liu WH, He XH, He C, Peng BW. Silencing of circIgf1r plays a protective role in neuronal injury via regulating astrocyte polarization during epilepsy. FASEB J 2021; 35:e21330. [PMID: 33417289 DOI: 10.1096/fj.202001737rr] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [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: 07/13/2020] [Revised: 12/02/2020] [Accepted: 12/14/2020] [Indexed: 01/09/2023]
Abstract
Epilepsy is a common brain disorder, repeated seizures of epilepsy may lead to a series of brain pathological changes such as neuronal or glial damage. However, whether circular RNAs are involved in neuronal injury during epilepsy is not fully understood. Here, we screened circIgf1r in the status epilepticus model through circRNA sequencing, and found that it was upregulated after the status epilepticus model through QPCR analysis. Astrocytes polarizing toward neurotoxic A1 phenotype and neurons loss were observed after status epilepticus. Through injecting circIgf1r siRNA into the lateral ventricle, it was found that knocking down circIgf1r in vivo would induce the polarization of astrocytes to phenotype A2 and reduce neuronal loss. The results in vitro further confirmed that inhibiting the expression of circIgf1r in astrocytes could protect neurons by converting reactive astrocytes from A1 to the protective A2. In addition, knocking down circIgf1r in astrocytes could functionally promote astrocyte autophagy and relieve the destruction of 4-AP-induced autophagy flux. In terms of mechanism, circIgf1r promoted the polarization of astrocytes to phenotype A1 by inhibiting autophagy. Taken together, our results reveal circIgf1r may serve as a potential target for the prevention and treatment of neuron damage after epilepsy.
Collapse
Affiliation(s)
- Lin Shao
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Guang-Tong Jiang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xing-Liang Yang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jing-Jing Cheng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Shuo Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xin Dong
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Song Han
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jun Yin
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Wan-Hong Liu
- Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xiao-Hua He
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Chunjiang He
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China.,College of Biomedicine and Health, Huazhong Agricultural University, Wuhan, China
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| |
Collapse
|
11
|
Yang XL, Zeng ML, Shao L, Jiang GT, Cheng JJ, Chen TX, Han S, Yin J, Liu WH, He XH, Peng BW. NFAT5 and HIF-1α Coordinate to Regulate NKCC1 Expression in Hippocampal Neurons After Hypoxia-Ischemia. Front Cell Dev Biol 2019; 7:339. [PMID: 31921851 PMCID: PMC6923656 DOI: 10.3389/fcell.2019.00339] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 11/29/2019] [Indexed: 12/22/2022] Open
Abstract
Hypoxic-ischemic encephalopathy (HIE) is a serious birth complication with severe long-term sequelae such as cerebral palsy, epilepsy and cognitive disabilities. Na+-K+-2Cl– cotransporters 1 (NKCC1) is dramatically upregulated after hypoxia-ischemia (HI), which aggravates brain edema and brain damage. Clinically, an NKCC1-specific inhibitor, bumetanide, is used to treat diseases related to aberrant NKCC1 expression, but the underlying mechanism of aberrant NKCC1 expression has rarely been studied in HIE. In this study, the cooperative effect of hypoxia-inducible factor-1α (HIF-1α) and nuclear factor of activated T cells 5 (NFAT5) on NKCC1 expression was explored in hippocampal neurons under hypoxic conditions. HI increased HIF-1α nuclear localization and transcriptional activity, and pharmacological inhibition of the HIF-1α transcription activity or mutation of hypoxia responsive element (HRE) motifs recovered the hypoxia-induced aberrant expression and promoter activity of NKCC1. In contrast, oxygen–glucose deprivation (OGD)-induced downregulation of NFAT5 expression was reversed by treating with hypertonic saline, which ameliorated aberrant NKCC1 expression. More importantly, knocking down NFAT5 or mutation of the tonicity enhancer element (TonE) stimulated NKCC1 expression and promoter activity under normal physiological conditions. The positive regulation of NKCC1 by HIF-1α and the negative regulation of NKCC1 by NFAT5 may serve to maintain NKCC1 expression levels, which may shed light on the transcription regulation of NKCC1 in hippocampal neurons after hypoxia.
Collapse
Affiliation(s)
- Xing-Liang Yang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Lin Shao
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Guang-Tong Jiang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jing-Jing Cheng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Song Han
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Jun Yin
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Wan-Hong Liu
- Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Xiao-Hua He
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| |
Collapse
|
12
|
Wang X, Yang XL, Kong WL, Zeng ML, Shao L, Jiang GT, Cheng JJ, Kong S, He XH, Liu WH, Chen TX, Peng BW. TRPV1 translocated to astrocytic membrane to promote migration and inflammatory infiltration thus promotes epilepsy after hypoxic ischemia in immature brain. J Neuroinflammation 2019; 16:214. [PMID: 31722723 PMCID: PMC6852893 DOI: 10.1186/s12974-019-1618-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 10/16/2019] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Neonatal hypoxic-ischemic brain damage (HIBD), a leading cause of neonatal mortality, has intractable sequela such as epilepsy that seriously affected the life quality of HIBD survivors. We have previously shown that ion channel dysfunction in the central nervous system played an important role in the process of HIBD-induced epilepsy. Therefore, we continued to validate the underlying mechanisms of TRPV1 as a potential target for epilepsy. METHODS Neonatal hypoxic ischemia and oxygen-glucose deprivation (OGD) were used to simulate HIBD in vivo and in vitro. Primarily cultured astrocytes were used to assess the expression of TRPV1, glial fibrillary acidic protein (GFAP), cytoskeletal rearrangement, and inflammatory cytokines by using Western blot, q-PCR, and immunofluorescence. Furthermore, brain electrical activity in freely moving mice was recorded by electroencephalography (EEG). TRPV1 current and neuronal excitability were detected by whole-cell patch clamp. RESULTS Astrocytic TRPV1 translocated to the membrane after OGD. Mechanistically, astrocytic TRPV1 activation increased the inflow of Ca2+, which promoted G-actin polymerized to F-actin, thus promoted astrocyte migration after OGD. Moreover, astrocytic TRPV1 deficiency decreased the production and release of pro-inflammatory cytokines (TNF, IL-6, IL-1β, and iNOS) after OGD. It could also dramatically attenuate neuronal excitability after OGD and brain electrical activity in HIBD mice. Behavioral testing for seizures after HIBD revealed that TRPV1 knockout mice demonstrated prolonged onset latency, shortened duration, and decreased seizure severity when compared with wild-type mice. CONCLUSIONS Collectively, TRPV1 promoted astrocyte migration thus helped the infiltration of pro-inflammatory cytokines (TNF, IL-1β, IL-6, and iNOS) from astrocytes into the vicinity of neurons to promote epilepsy. Our study provides a strong rationale for astrocytic TRPV1 to be a therapeutic target for anti-epileptogenesis after HIBD.
Collapse
Affiliation(s)
- Xin Wang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Xing-Liang Yang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Wei-Lin Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Meng-Liu Zeng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Lin Shao
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Guang-Tong Jiang
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Jing-Jing Cheng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Shuo Kong
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Xiao-Hua He
- Department of Pathophysiology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Wan-Hong Liu
- Department of Immunology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Tao-Xiang Chen
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China
| | - Bi-Wen Peng
- Department of Physiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, 430071, China.
| |
Collapse
|
13
|
Li XC, Chen D, Chen TX, Lu FL, Ma J, Zhao CM. [Langerhans cell histiocytosis with periodontal lesions as the initial manifestation: a case report]. Zhonghua Kou Qiang Yi Xue Za Zhi 2018; 53:187-190. [PMID: 29972977 DOI: 10.3760/cma.j.issn.1002-0098.2018.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- X C Li
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - D Chen
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - T X Chen
- Cimplant Dental Clinic, Zhengzhou 450000, China
| | - F L Lu
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - J Ma
- Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - C M Zhao
- Department of Radiology, The Second People's Hospital of Zhengzhou, Zhengzhou 450006, China
| |
Collapse
|
14
|
Chen TX, Xu XY, Zhao Z, Zhao FY, Gao YM, Yan XH, Wan Y. Hydrogen peroxide is a critical regulator of the hypoxia-induced alterations of store-operated Ca2+ entry into rat pulmonary arterial smooth muscle cells. Am J Physiol Lung Cell Mol Physiol 2017; 312:L477-L487. [DOI: 10.1152/ajplung.00138.2016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 01/23/2017] [Accepted: 01/23/2017] [Indexed: 12/28/2022] Open
Abstract
To investigate the association between store-operated Ca2+ entry (SOCE) and reactive oxygen species (ROS) during hypoxia, this study determined the changes of transient receptor potential canonical 1 (TRPC1) and Orai1, two candidate proteins for store-operated Ca2+ (SOC) channels and their gate regulator, stromal interaction molecule 1 (STIM1), in a hypoxic environment and their relationship with ROS in pulmonary arterial smooth muscle cells (PASMCs). Exposure to hypoxia caused a transient Ca2+ spike and subsequent Ca2+ plateau of SOCE to be intensified in PASMCs when TRPC1, STIM1, and Orai1 were upregulated. SOCE in cells transfected with specific short hairpin RNA (shRNA) constructs was almost completely eliminated by the knockdown of TRPC1, STIM1, or Orai1 alone and was no longer affected by hypoxia exposure. Hypoxia-induced SOCE enhancement was further strengthened by PEG-SOD but was attenuated by PEG-catalase, with correlated changes to intracellular hydrogen peroxide (H2O2) levels and protein levels of TRPC1, STIM1, and Orai1. Exogenous H2O2 could mimic alterations of the interactions of STIM1 with TRPC1 and Orai1 in hypoxic cells. These findings suggest that TRPC1, STIM1, and Orai1 are essential for the initiation of SOCE in PASMCs. Hypoxia-induced ROS promoted the expression and interaction of the SOC channel molecules and their gate regulator via their converted product, H2O2.
Collapse
Affiliation(s)
- Tao-Xiang Chen
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Xiao-Ya Xu
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Zhao Zhao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Fang-Yu Zhao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Yi-Mei Gao
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Xiao-Hong Yan
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| | - Yu Wan
- Department of Physiology, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China
| |
Collapse
|
15
|
Shi X, Yang GL, Chen Y, Guo J, Yang WL, Yuan P, Gong SG, Jiang R, Zhao QH, Wang L, He J, Chen TX, Liu JM. [End tidal PCO(2) for evaluation of severity of disease in idiopathic pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension]. Zhonghua Jie He He Hu Xi Za Zhi 2017; 40:34-39. [PMID: 28100360 DOI: 10.3760/cma.j.issn.1001-0939.2017.01.008] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Objective: To explore the difference in end tidal PCO(2) (P(ET)CO(2)) between idiopathic pulmonary arterial hypertension (IPAH) and chronic thromboembolic pulmonary hypertension (CTEPH), and to analyze the correlation between P(ET)CO(2) and the indexes of disease severity in IPAH and CTEPH patients. Methods: Data were retrieved from 68 IPAH patients and 52 CTEPH patients who all had received right-heart catheterization, pulmonary function test and cardiopulmonary exercise testing at Shanghai Pulmonary Hospital from October 2011 to October 2014. In addition, other clinical parameters were also collected. Results: The IPAH group had a significantly higher mPAP, PVR [(60±16) mmHg (1 mmHg=0.133 kPa), (13±6) Wood U ] than the CTEPH group [(46±12) mmHg, (9±4) Wood U, t=4.90, 4.83, all P<0.01]. Meanwhile, the IPAH group had a lower percentage of predicted peakVO(2), oxygen pulse [(45±15)%, (60±22)%] compared with the CTEPH group [(53±16)%, (68±21)%, t=-2.42, -1.96, all P<0.05]. The value of P(ET)CO(2) at rest, AT, peak in the IPAH patients [(27±5), (28±7), (25±7) mmHg] were higher than those in the CTEPH patients [(24±4) mmHg, (23±6) mmHg, (21±6) mmHg, t=3.22-4.54, all P<0.01]. There was a significantly difference in P(ET)CO(2) at AT and peak between WHO-FC Ⅰ-Ⅱ and Ⅲ-Ⅳ subgroups in IPAH (t=2.55, 2.60, all P<0.05) and CTEPH (t=2.39, P<0.05), except for P(ET)CO(2) at peak in the CTEPH patients (t=1.71, P>0.05). A moderately inverse correlation was found between P(ET)CO(2) at AT and NT-proBNP in the IPAH group (r=-0.58, P<0.01), meanwhile P(ET)CO(2) at AT in the CTEPH group was weakly correlated with NT-proBNP (r=-0.34, P<0.05). Conclusions: Compared with the CTEPH patients, the IPAH patients had significantly decreased exercise capacity and increased P(ET)CO(2). P(ET)CO(2) could reflect the disease severity in both IPAH and CTEPH patients, being superior in IPAH than in CTEPH. Furthermore, P(ET)CO(2) at AT might be better than P(ET)CO(2) at peak in reflecting the ventilatory efficiency.
Collapse
Affiliation(s)
- X Shi
- Tongji University School of Medicine, Shanghai 200092, China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Yao XF, Xiong YY, Liu L, Chen TX, Li L. [Expression of multidrug resistance-associated gene in non-small cell lung cancer and its correlations with telomerase reverse transcriptase and genes related to apoptosis]. Zhonghua Bing Li Xue Za Zhi 2005; 34:110-1. [PMID: 15842809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
|
17
|
Li L, Xiong YY, Liu L, Chen TX, Yao XF, Wang YW. [Relationships among expressions of hTERT, MDR1, MRP mRNA, and C-myc protein in non-small cell lung cancer]. Ai Zheng 2005; 24:53-7. [PMID: 15642200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
BACKGROUND & OBJECTIVE The latest researches showed that myc protein could up-regulate the expression of human telomerase reverse transcriptase (hTERT), multidrug resistance gene 1(MDR1), multidrug resistance-related protein (MRP) in some kinds of tumors, and hTERT is correlated with efficiency of anti-tumor chemotherapy. This study was to investigate relations among expressions of hTERT, MDR1, MRP mRNA, and C-myc protein in non-small cell lung cancer (NSCLC). METHODS Expressions of hTERT, MDR1, MRP mRNA in 113 cases of NSCLC tissues were detected by in situ hybridization, expression of C-myc protein was detected by SP immunohistochemistry, their correlations with clinicopathologic features of NSCLC were statistically analyzed. RESULTS Positive rates of hTERT, MDR1, MRP mRNA, and C-myc protein in NSCLC tissues were 80.5%, 51.3%, 80.5% and 68.1%, respectively. Expressions of MDR1, MRP mRNA, and C-myc protein were significantly related to that of hTERT mRNA (P<0.05). Expression of C-myc protein did not correlate with expression of MDR1 or MRP mRNA. All 4 factors have no correlation with clinicopathologic features of NSCLC (P>0.05). CONCLUSION Expression of hTERT mRNA may be related to those of MDR1, MRP mRNA, and C-myc in NSCLC. Overexpression of C-myc protein may be one of the molecular regulatory mechanisms of hTERT mRNA.
Collapse
MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/biosynthesis
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- Adenocarcinoma/genetics
- Adenocarcinoma/metabolism
- Adenocarcinoma/pathology
- Adult
- Aged
- Carcinoma, Non-Small-Cell Lung/genetics
- Carcinoma, Non-Small-Cell Lung/metabolism
- Carcinoma, Non-Small-Cell Lung/pathology
- DNA-Binding Proteins/biosynthesis
- DNA-Binding Proteins/genetics
- Female
- Genes, MDR
- Humans
- Lung Neoplasms/genetics
- Lung Neoplasms/metabolism
- Lung Neoplasms/pathology
- Lymphatic Metastasis
- Male
- Middle Aged
- Multidrug Resistance-Associated Proteins/biosynthesis
- Multidrug Resistance-Associated Proteins/genetics
- Neoplasm Staging
- Proto-Oncogene Proteins c-myc/biosynthesis
- Proto-Oncogene Proteins c-myc/genetics
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Telomerase/biosynthesis
- Telomerase/genetics
Collapse
Affiliation(s)
- Li Li
- Department of Pathology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei 430-071, P.R. China.
| | | | | | | | | | | |
Collapse
|
18
|
Chen TX, Xiong YY, Liu L. [Expression and significance of telomerase reverse transcriptase and its regulators in non-small cell lung carcinoma]. Ai Zheng 2004; 23:273-7. [PMID: 15025956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
BACKGROUND & OBJECTIVE Telomerase is a ribonucleoprotein complex, which is silent in normal human somatic cells but may be reactivated by a series of regulators, and cause tumorigenesis. As a critical factor of telomerase activity, much progression has been achieved in the study of regulation of human telomerase reverse transcriptase, but the detail mechanism is still not clear. This study was designed to investigate the relationship of expression of human telomerase reverse transcriptase mRNA (hTERT mRNA) and its regulators including c-myc, mutant p53, protein kinase C alpha (PKCalpha) with clinicopathological significance of expression of the four markers in non-small cell lung carcinoma (NSCLC). METHODS The expression of hTERT mRNA in 113 NSCLC specimens were detected by in situ hybridization, and the expression of c-myc, mutant p53, and PKCalpha in the same specimens were detected by immunohistochemistry. RESULTS The positive rates of 113 NSCLC samples for hTERT mRNA, c-myc, mutant p53, and PKCalpha were 80.5%, 68.1%, 61.9%, and 85.0%, respectively. The differences were statistically significant among the expression of hTERT mRNA, c-myc, and PKCalpha (P< 0.05 or P< 0.01), but was not significant between the expression of mutant p53 and hTERT mRNA, c-myc as well as PKCalpha. The expression of mutant p53 was associated with carcinoma cell differentiation (P< 0.05), and its positive rate gradually increased with the extend of differentiation of carcinoma cell. The expression of hTERT mRNA, c-myc, and PKCalpha were not associated with carcinoma cell differentiation. There was no relationship of expression of the four markers with histological types, TNM stages, and lymph node metastasis status. CONCLUSION C-myc and PKCalphawere associated with the expression of telomerase.
Collapse
Affiliation(s)
- Tao-Xiang Chen
- Department of Pathology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, PR China.
| | | | | |
Collapse
|
19
|
Shen L, Chen TX, Wang YP, Lin Z, Zhao HJ, Zu YZ, Wu G, Ying DM. As2O3 induces apoptosis of the human B lymphoma cell line MBC-1. J BIOL REG HOMEOS AG 2000; 14:116-9. [PMID: 10841286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To see how arsenic trioxide (As2O3) affects proliferation of the human B lymphoma cell line MBC-1. METHODS We studied the effect of As2O3 on MBC-1 cells and its mechanism by morphological observation, flow cytometry assay and DNA gel electrophoresis. RESULTS As2O3 could upregulate p53 gene expression at protein level, inducing cell apoptosis and inhibiting the proliferation of MBC-1 cells. Upregulation of p53 expression appears to be important in the apoptosis of MBC-1 cells. CONCLUSIONS As2O3 can inhibit the proliferation of MBC-1 cells by upregulating p53 gene expression, thus inducing apoptosis.
Collapse
Affiliation(s)
- L Shen
- Department of Oncology, Shanghai Institute for Pediatric Research, China
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Chen TX, Wanibuchi H, Wei M, Morimura K, Yamamoto S, Hayashi S, Fukushima S. Concentration dependent promoting effects of sodium L-ascorbate with the same total dose in a rat two-stage urinary bladder carcinogenesis. Cancer Lett 1999; 146:67-71. [PMID: 10656611 DOI: 10.1016/s0304-3835(99)00232-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Sodium L-ascorbate (Na-AsA) has been demonstrated to be a strong promoter of rat urinary bladder tumor development initiated by N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN). In the present study, we investigated variation in its promoting activity when the same total dose was given with different concentrations and exposure times. After 4 weeks administration of 0.05% BBN, group 1 served as a control without any post-initiation treatment. The rats in groups 2-4 received 1.25% Na-AsA diet for 36 weeks, 2.5% Na-AsA for 18 weeks and 5% Na-AsA for 8 weeks, respectively. Tumor number (papillomas and carcinomas) was greatest in group 3, and area in group 4 (P < 0.05). However, no enhancement was noted in group 2, although preneoplastic lesions were significantly increased. These results suggest that with the same total administration dose, high concentration of Na-AsA has the strongest promoting effects on tumor development in urinary bladder carcinogenesis.
Collapse
Affiliation(s)
- T X Chen
- Department of Pathology, Osaka City University Medical School, Osaka, Japan.
| | | | | | | | | | | | | |
Collapse
|
21
|
Cai Q, Liu HJ, Chen YC, Ji GY, Chen TX. Expression of HSP70 gene in rat brain after exposures to repeated +Gz. Space Med Med Eng (Beijing) 1999; 12:313-7. [PMID: 12022172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
OBJECTIVE To study the changes of mRNA expression of heat shock protein 70 (HSP70) in the rat brain exposed to repeated +Gz. METHOD The mRNA expression levels of HSP70 in rat brain were measured by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR). RESULT The HSP70 mRNA expression levels in rat brains taken 30 min and 6 h after repeated +Gz exposures were significantly higher than those in control group, while the difference between the levels of control group and those of experimental rat brains taken 24 h after +Gz exposure was not significant. CONCLUSION It is suggested that HSP70 mRNA expression in rat brain can be induced by repeated +Gz exposures and the increased HSP70 mRNA expression may play an important role in self-protection against brain damage induced by +Gz exposures.
Collapse
Affiliation(s)
- Q Cai
- Molecular Biology Research Center, General Hospital of The Air Force, Beijing
| | | | | | | | | |
Collapse
|
22
|
Morimura K, Yamamoto S, Murai T, Mori S, Chen TX, Wanibuchi H, Fukushima S. LOH and mutational analysis of p53 alleles in mouse urinary bladder carcinomas induced by N-butyl-N-(4-hydroxybutyl) nitrosamine. Carcinogenesis 1999; 20:715-8. [PMID: 10223204 DOI: 10.1093/carcin/20.4.715] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In human urinary bladder carcinogenesis, alterations in the p53 tumor suppressor gene are common events. We have previously reported that they are also frequent in invasive urinary bladder carcinomas induced by N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) in NON/Shi mice. To further investigate the significance of the p53 gene status for mouse urinary bladder carcinogenesis, we examined both allele loss and mutational alterations in urinary bladder cancers of (NON/Shi x C3H/He/Shi) F1 hybrid mice exposed to the carcinogen for 12 weeks and then maintained for a further 9 weeks without treatment. An intragenic silent polymorphism within exon 7 of the p53 gene between NON/Shi and C3H/He/Shi mice allows assessment of allele loss of the p53 gene and determination of the parental origin of mutated and/or lost alleles. A tissue microdissection method was employed to obtain carcinoma samples without excessive contamination with normal tissue. Allele losses were detected in one of 14 tumors (7.1%) and nine mutations in eight of 14 (57%) tumors were found in exons 5-8 by polymerase chain reaction-single strand conformation polymorphism followed by DNA direct sequencing analysis. All mutations involved one base substitution with an amino acid change, although the types of base substitution were random. In conclusion, the high incidence of p53 alterations suggests a significant role in the genesis of invasive urinary bladder tumors in BBN-treated mice.
Collapse
Affiliation(s)
- K Morimura
- First Department of Pathology, Osaka City University Medical School, Osaka, Japan.
| | | | | | | | | | | | | |
Collapse
|
23
|
Chen TX, Wanibuchi H, Murai T, Kitano M, Yamamoto S, Fukushima S. Promotion by sodium L-ascorbate in rat two-stage urinary bladder carcinogenesis is dependent on the interval of administration. Jpn J Cancer Res 1999; 90:16-22. [PMID: 10076560 PMCID: PMC5925984 DOI: 10.1111/j.1349-7006.1999.tb00660.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
In our two-stage model of rat urinary bladder carcinogenesis employing N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) as the initiator, sodium L-ascorbate (Na-AsA) exhibits dose-dependent promotion. In the present study, in order to assess the possible reversibility of the promoting effects, we investigated how different administration periods of Na-AsA influence its promoting activity. In experiment 1, rats were treated with 5% Na-AsA for different administration periods with or without withdrawal and injected with 5-bromo-2'-deoxyuridine (BrdU) to allow determination of the cell proliferation status. Replicative DNA synthesis in the urinary bladder epithelium was shown to return to normal after removal of the promoting stimulus. In experiment 2, rats were initially given BBN for 4 weeks and subsequently received 16 weeks of Na-AsA, alternating with basal diet, at intervals of 4, 8 or 16 weeks, within a total 32-week period. The longer the continuous exposure to Na-AsA, the greater the yield of papillomas and carcinomas in the urinary bladder. In experiment 3, Na-AsA was given for 4 or 8 weeks after BBN initiation and the animals were killed at weeks 8 and 12. Both promotion of lesion development and increase of DNA synthesis in the urinary bladder epithelium were dependent on the length of exposure to Na-AsA and the total period of exposure. The results indicate that the promoting effects of Na-AsA in urinary bladder carcinogenesis are reversible to a certain extent after its withdrawal, and the existence of a cumulative exposure time threshold seems likely.
Collapse
Affiliation(s)
- T X Chen
- First Department of Pathology, Osaka City University Medical School
| | | | | | | | | | | |
Collapse
|
24
|
Zhang XL, Komada Y, Zhou YW, Chen TX, Sakai H, Azuma E, Ido M, Sakurai M. Inhibition of interleukin-2 receptor (CD25) expression induced on T cells from children with acute lymphoblastic leukemia. Cancer Immunol Immunother 1997; 44:41-7. [PMID: 9111583 PMCID: PMC11037694 DOI: 10.1007/s002620050353] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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] [Indexed: 02/04/2023]
Abstract
Peripheral blood lymphocytes obtained from children with acute lymphoblastic leukemia (ALL) at onset were studied for the expression of interleukin-2 (IL-2) receptor alpha-chain (CD25) by two-color flow-cytometric analysis. Stimulated with anti-CD3 monoclonal antibody (mAb) alone. CD25 expression was significantly suppressed in CD4+ T cells from 27 of 48 (56.3%) cases and in CD8+ T cells from 29 of 48 (60.4%) cases. When stimulated with anti-CD3 mAb plus phorbol 12-myristate 13-acetate (PMA), CD25 expression was clearly restored in certain cases of ALL. When PMA plus ionomycin were used for stimulation of T cells. CD25 was inducible in a majority of cases. Interestingly CD25 expression upon anti-CD3 mAb stimulation was recovered after complete remission had been achieved. These observations suggest the presence in ALL children at onset of an in vitro defect in the signal transduction pathway of the T-cell-receptor/CD3 complex, resulting in inefficient CD25 expression. However, immune-staining analysis indicated that protein kinase C was normally translocated from the cytosol fraction to the cell membrane fraction. The mobilization of cytoplasmic free calcium is also normal.
Collapse
Affiliation(s)
- X L Zhang
- Department of Pediatrics, Mie University School of Medicine, Japan
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Komada Y, Zhou YW, Zhang XL, Chen TX, Tanaka S, Azuma E, Sakurai M. Fas/APO-1 (CD95)-mediated cytotoxicity is responsible for the apoptotic cell death of leukaemic cells induced by interleukin-2-activated T cells. Br J Haematol 1997; 96:147-57. [PMID: 9012700 DOI: 10.1046/j.1365-2141.1997.8742505.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Apoptotic cell death is induced by the cross-linking of Fas/APO-1 receptor (CD95) in acute myelogenous leukaemia (AML) cells. Since CD95 ligand (CD95L) is expressed on interleukin-2 (IL-2)-activated T cells, we investigated the involvement of CD95-CD95L pathway in T cell-mediated cytotoxicity against AML cells. Activated CD8+ T cells could efficiently kill a parental CD95-sensitive AML cell line, MML-1 and, to a lesser extent, a CD95-resistant clone, MML-1R. Neither MML-1 nor MML-1R cells were killed by activated CD4+ T cells. The blocking monoclonal antibody (MoAb) against CD95, ZB4, caused a significant inhibition of T-cell-mediated cytotoxicity against MML-1 cells but not against MML-1R cells. Interestingly, MML-1 cells underwent the classic nuclear morphologic changes and DNA fragmentation characteristic of apoptosis when cultured with activated T cells. Enumeration of apoptotic and necrotic nuclei showed that both apoptosis and necrosis were induced in MML-1 cells, whereas necrosis was exclusively observed in MML-1R cells. Apoptosis of MML-1 cells was completely blocked in the presence of ZB4 MoAb. Similarly, blocking by ZB4 MoAb significantly inhibited T-cell-mediated lysis of fresh AML cells in a CD95-sensitive group, but not in a CD95-refractory group. In addition CD8+ T cells expressed CD95L mRNA more abundantly than CD4+ T cells upon activation by IL-2. These findings suggest that T-cell-mediated cytotoxicity against AML cells requires participation of CD95-CD95L pathway for cytotoxic signal transduction leading to target apoptosis.
Collapse
MESH Headings
- Apoptosis/immunology
- Cell Nucleus/pathology
- Child
- Child, Preschool
- Cytotoxicity, Immunologic
- DNA Fragmentation
- Humans
- Interleukin-2/immunology
- Killer Cells, Lymphokine-Activated/immunology
- Leukemia, Myeloid, Acute/immunology
- Leukemia, Myeloid, Acute/pathology
- RNA, Messenger/metabolism
- Signal Transduction
- T-Lymphocytes, Cytotoxic/immunology
- Tumor Cells, Cultured
- fas Receptor/immunology
- fas Receptor/metabolism
Collapse
Affiliation(s)
- Y Komada
- Department of Paediatrics, Mie University School of Medicine, Japan
| | | | | | | | | | | | | |
Collapse
|
26
|
Chen TX, Sun HX, Oktia K, Takemoto T. Effects of epidermal growth factor, glucagon and insulin on the hepatocytes after experimental liver cell necrosis. In vivo studies with monoclonal anti-bromo-deoxyuridine staining. Chin Med J (Engl) 1988; 101:837-40. [PMID: 3150726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
27
|
Chen TX. [Effects of epidermal growth factor on the regeneration of hepatocytes after hepatic necrosis in rats]. Zhonghua Yi Xue Za Zhi 1988; 68:371-3, 26. [PMID: 3067830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
28
|
Liu QY, Zhu CG, Deng DZ, Lu JH, Zhu JX, Chen TX, Wu ZJ, Hu DS. Synaptic connections in the spinal ganglia of the rat. Acta Acad Med Wuhan 1985; 5:1-4. [PMID: 4000585 DOI: 10.1007/bf02856901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|