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Mo L, Li S, Cheng S, Li Y, Xu F, Zhang D. Emotion regulation of social pain: double dissociation of lateral prefrontal cortices supporting reappraisal and distraction. Soc Cogn Affect Neurosci 2023; 18:nsad043. [PMID: 37676260 PMCID: PMC10484058 DOI: 10.1093/scan/nsad043] [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: 12/31/2022] [Revised: 07/06/2023] [Accepted: 08/30/2023] [Indexed: 09/08/2023] Open
Abstract
The dorsolateral prefrontal cortex (DLPFC) and ventrolateral prefrontal cortex (VLPFC) are both crucial regions involved in voluntary emotion regulation. However, it remains unclear whether the two regions show functional specificity for reappraisal and distraction. This study employed transcranial magnetic stimulation (TMS) to explore, in a real social interactive scenario, whether different lateral prefrontal regions play relatively specific roles in downregulating social pain via reappraisal and distraction. Participants initially took part in a social interactive game, followed by receiving either active (the DLPFC- or VLPFC-activated group, n = 100 per group) or control (the vertex-activated group, n = 100) TMS session. They were then instructed to use both distraction and reappraisal strategies to downregulate any negative emotions evoked by the social evaluation given by their peers who interacted with them previously. Results demonstrated that the TMS-activated DLPFC has a greater beneficial effect during distraction, whereas the activated VLPFC has a greater beneficial effect during reappraisal. This result investigated the direct experience of social pain and extended previous findings on empathy-related responses to affective pictures while also controlling for confounding factors such as empathic concern. Therefore, we are now confident in the double dissociation proposal of the DLPFC and VLPFC in distraction and reappraisal.
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Affiliation(s)
- Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Sijin Li
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Si Cheng
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Yiwei Li
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Feng Xu
- Shenzhen Yingchi Technology Co., Ltd, Shenzhen 518057, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu 610066, China
- China Center for Behavioral Economics and Finance, School of Economics, Southwestern University of Finance and Economics, Chengdu 611130, China
- Shenzhen-Hong Kong Institute of Brain Science, Shenzhen 518060, China
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2
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He Z, Li S, Mo L, Zheng Z, Li Y, Li H, Zhang D. The VLPFC-Engaged Voluntary Emotion Regulation: Combined TMS-fMRI Evidence for the Neural Circuit of Cognitive Reappraisal. J Neurosci 2023; 43:6046-6060. [PMID: 37507228 PMCID: PMC10451149 DOI: 10.1523/jneurosci.1337-22.2023] [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: 07/07/2022] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 07/30/2023] Open
Abstract
A clear understanding of the neural circuit underlying emotion regulation (ER) is important for both basic and translational research. However, a lack of evidence based on combined neuroimaging and neuromodulation techniques calls into question (1) whether the change of prefrontal-subcortical activity intrinsically and causally contributes to the ER effect; and (2) whether the prefrontal control system directly modulates the subcortical affective system. Accordingly, we combined fMRI recordings with transcranial magnetic stimulation (TMS) to map the causal connections between the PFC and subcortical affective structures (amygdala and insula). A total of 117 human adult participants (57 males and 60 females) were included in the study. The results revealed that TMS-induced ventrolateral PFC (VLPFC) facilitation led to enhanced activity in the VLPFC and ventromedial PFC (VMPFC) as well as attenuated activity in the amygdala and insula during reappraisal but not during nonreappraisal (i.e., baseline). Moreover, the activated VLPFC intensified the prefrontal-subcortical couplings via the VMPFC during reappraisal only. This study provides combined TMS-fMRI evidence that downregulating negative emotion involves the prefrontal control system suppressing the subcortical affective system, with the VMPFC serving as a crucial hub within the VLPFC-subcortical network, suggesting an indirect pathway model of the ER circuit. Our findings outline potential protocols for improving ER ability by intensifying the VLPFC-VMPFC coupling in patients with mood and anxiety disorders.SIGNIFICANCE STATEMENT Using fMRI to examine the TMS effect, we uncovered that the opposite neural changes in prefrontal (enhanced) and subcortical (attenuated) regions are not a byproduct of emotion regulation (ER); instead, this prefrontal-subcortical activity per se causally contributes to the ER effect. Furthermore, using TMS to amplify the neural changes within the ER circuit, the "bridge" role of the VMPFC is highlighted under the reappraisal versus nonreappraisal contrast. This "perturb-and-measure" approach overcomes the correlational nature of fMRI data, helping us to identify brain regions that causally support reappraisal (the VLPFC and VMPFC) and those that are modulated by reappraisal (the amygdala and insula). The uncovered ER circuit is important for understanding the neural systems underlying reappraisal and valuable for translational research.
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Affiliation(s)
- Zhenhong He
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, 610066, China
- School of Psychology, Shenzhen University, Shenzhen, 518060, China
| | - Sijin Li
- School of Psychology, Shenzhen University, Shenzhen, 518060, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen, 518060, China
| | - Zixin Zheng
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, 610066, China
| | - Yiwei Li
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, 610066, China
| | - Hong Li
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, 610066, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, 610066, China
- Shenzhen-Hong Kong Institute of Brain Science, Shenzhen, 518055, China
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3
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Yu W, Li Y, Cao X, Mo L, Chen Y, Zhang D. The role of ventrolateral prefrontal cortex on voluntary emotion regulation of social pain. Hum Brain Mapp 2023. [PMID: 37376719 PMCID: PMC10400789 DOI: 10.1002/hbm.26411] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 05/25/2023] [Accepted: 06/11/2023] [Indexed: 06/29/2023] Open
Abstract
The right ventrolateral prefrontal cortex (rVLPFC) is highly engaged in emotion regulation of social pain. However, there is still lack of both inhibition and excitement evidence to prove the causal relationship between this brain region and voluntary emotion regulation. This study used high-frequency (10 Hz) and low-frequency (1 Hz) repetitive transcranial magnetic stimulation (rTMS) to separately activate or inhibit the rVLPFC in two groups of participants. We recorded participants' emotion ratings as well as their social attitude and prosocial behaviors following emotion regulation. Also, we used eye tracker to record the changes of pupil diameter to measure emotional feelings objectively. A total of 108 healthy participants were randomly assigned to the activated, inhibitory or sham rTMS groups. They were required to accomplish three sequential tasks: the emotion regulation (cognitive reappraisal) task, the favorability rating task, and the donation task. Results show that the rVLPFC-inhibitory group reported more negative emotions and showed larger pupil diameter while the rVLPFC-activated group showed less negative emotions and reduced pupil diameter during emotion regulation (both compared with the sham rTMS group). In addition, the activated group gave more positive social evaluation to peers and donated more money to a public welfare activity than the rVLPFC-inhibitory group, among which the change of social attitude was mediated by regulated emotion. Taken together, these findings reveal that the rVLPFC plays a causal role in voluntary emotion regulation of social pain and can be a potential brain target in treating deficits of emotion regulation in psychiatric disorders.
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Affiliation(s)
- Wenwen Yu
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Yiwei Li
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China
| | - Xueying Cao
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Yuming Chen
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China
- Shenzhen-Hong Kong Institute of Brain Science, Shenzhen, China
- Magnetic Resonance Imaging Center, Shenzhen University, Shenzhen, China
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Cheng S, Qiu X, Li S, Mo L, Xu F, Zhang D. Different Roles of the Left and Right Ventrolateral Prefrontal Cortex in Cognitive Reappraisal: An Online Transcranial Magnetic Stimulation Study. Front Hum Neurosci 2022; 16:928077. [PMID: 35754771 PMCID: PMC9226322 DOI: 10.3389/fnhum.2022.928077] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/17/2022] [Indexed: 11/13/2022] Open
Abstract
The ventrolateral prefrontal cortex (VLPFC) plays a pivotal role in cognitive reappraisal. Previous studies suggested a functional asymmetry of the bilateral VLPFC, but the evidence is still insufficient during cognitive reappraisal. In this study, we conducted an online single-pulse transcranial magnetic stimulation (spTMS) to investigate the causal and distinct roles of the left and right VLPFC in reappraisal. Participants were instructed to reappraise (down-regulate) or attend to pictures depicting social exclusion scenarios while the spTMS was applied over the left or right VLPFC of the participants’ brains. The results showed that spTMS of either the left or the right VLPFC would increase reappraisal difficulty. Meanwhile, the outcome of reappraisal (measured by self-reported negative feelings) significantly deteriorated when the right (but not the left) VLPFC was temporally interrupted by spTMS, while the verbal fluency during oral reporting of the reappraisal strategy was significantly reduced when the left VLPFC was interrupted by spTMS. Taken together, these findings provide causal evidence for the involvement of left and right VLPFC with distinct roles: while the left VLPFC is responsible for the linguistic especially semantic process of generating and selecting appraisals according to the goal of emotion regulation, the right VLPFC plays a critical role in inhibiting inappropriate negative emotions and thoughts generated by the effective scenarios. These findings deepen our understanding of the neurocognitive mechanism of emotion regulation.
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Affiliation(s)
- Si Cheng
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,School of Psychology, Shenzhen University, Shenzhen, China
| | - Xiufu Qiu
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Sijin Li
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Feng Xu
- Shenzhen Yingchi Technology Co., Ltd., Shenzhen, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,Shenzhen-Hong Kong Institute of Brain Science, Shenzhen, China
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5
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Gu R, Ao X, Mo L, Zhang D. Neural correlates of negative expectancy and impaired social feedback processing in social anxiety. Soc Cogn Affect Neurosci 2021; 15:285-291. [PMID: 32232371 PMCID: PMC7236026 DOI: 10.1093/scan/nsaa038] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 02/29/2020] [Accepted: 03/23/2020] [Indexed: 02/07/2023] Open
Abstract
Social anxiety has been associated with abnormalities in cognitive processing in the literature, manifesting as various cognitive biases. To what extent these biases interrupt social interactions remains largely unclear. This study used the Social Judgment Paradigm that could separate the expectation and experience stages of social feedback processing. Event-related potentials (ERPs) in these two stages were recorded to detect the effect of social anxiety that might not be reflected by behavioral data. Participants were divided into two groups according to their social anxiety level. Participants in the high social anxiety (HSA) group were more likely to predict that they would be socially rejected by peers than did their low social anxiety (LSA) counterparts (i.e. the control group). Compared to the ERP data of the LSA group, the HSA group showed: (a) a larger P1 component to social cues (peer faces) prior to social feedback presentation, possibly indicating an attention bias; (b) a difference in feedback-related negativity amplitude between unexpected social acceptance and unexpected social rejection, possibly indicating an expectancy bias; and (c) a diminished sensitivity of the P3 amplitude to social feedback valence (be accepted/be rejected), possibly indicating an experience bias. These results could help understand the cognitive mechanisms that comprise and maintain social anxiety.
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Affiliation(s)
- Ruolei Gu
- CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing 100101, China.,Department of Psychology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiang Ao
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen 518060, China
| | - Dandan Zhang
- School of Psychology, Shenzhen University, Shenzhen 518060, China.,Shenzhen Institute of Neuroscience, Shenzhen 518060, China
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6
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Xie H, Hu X, Mo L, Zhang D. Forgetting positive social feedback is difficult: ERP evidence in a directed forgetting paradigm. Psychophysiology 2021; 58:e13790. [PMID: 33569800 DOI: 10.1111/psyp.13790] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 08/15/2020] [Revised: 01/16/2021] [Accepted: 01/29/2021] [Indexed: 11/28/2022]
Abstract
Voluntary forgetting of unwanted memories is an adaptive cognitive function. However, it remains unknown how voluntary forgetting of unwanted social feedback may influence subsequent memories and evaluations, and what the underlying neurocognitive processes are. Here, we presented participants with peer photos together with feedback indicating social acceptance or rejection, followed by "remember" or "forget" instructive cues, while electroencephalograms were recorded during the experiment. We examined the Directed Forgetting (DF) effect in a recognition memory test, and tested participants' explicit and implicit attitudes toward the peers using a social evaluation task and an affect misattribution procedure (AMP). Both the memory test and the AMP were examined immediately and 3 days after the DF task so to estimate both the instant and the long-term effects of memory control. Behaviorally, immediate memory test showed smaller DF effect for positive than negative social feedback, which suggests that forgetting positive social feedback was more difficult than forgetting negative social feedback. Regarding the ERP results, although participants showed comparable frontal N2 amplitudes (reflecting inhibitory control efforts) following the instruction of forgetting positive and negative social feedback, positive feedback elicited larger late positive potential (LPP) amplitudes than negative feedback during initial encoding phase, suggesting an encoding bias for positive self-relevant information. Intriguingly, voluntary efforts to forget negative social feedback enhanced people's explicit and implicit evaluations toward the feedback senders. These findings provide new evidence for the adaptive function of memory control, which broadens the influence of voluntary forgetting in the context of social interaction and social evaluation.
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Affiliation(s)
- Hui Xie
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,Department of Psychology, The University of Hong Kong, Hong Kong, China
| | - Xiaoqing Hu
- Department of Psychology, The University of Hong Kong, Hong Kong, China.,The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, China.,HKU, Shenzhen Institute of Research and Innovation, Shenzhen, China
| | - Licheng Mo
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,College of Psychology, Shenzhen University, Shenzhen, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,College of Psychology, Shenzhen University, Shenzhen, China
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7
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Ao X, Mo L, Wei Z, Yu W, Zhou F, Zhang D. Negative Bias During Early Attentional Engagement in Major Depressive Disorder as Examined Using a Two-Stage Model: High Sensitivity to Sad but Bluntness to Happy Cues. Front Hum Neurosci 2020; 14:593010. [PMID: 33328939 PMCID: PMC7717997 DOI: 10.3389/fnhum.2020.593010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 08/09/2020] [Accepted: 10/21/2020] [Indexed: 11/13/2022] Open
Abstract
Negative attentional bias has been well established in depression. However, there is very limited knowledge about whether this depression-relevant negative bias exits during initial attentional allocation, as compared with the converging evidence for the negative bias during sustained attention engagement. This study used both behavioral and electrophysiological measures to examine the initial attention engagement in depressed patients influenced by mood-congruent and mood-incongruent emotions. The dot-probe task was performed with a 100-ms exposure time of the emotional cues (emotional and neutral face pairs). The behavioral results showed that the patients responded faster following valid compared with invalid sad facial cues. Electrophysiological indexes in the frame of the two-stage model of attentional modulation by emotions provided cognitive mechanisms in distinct attention engagement stages: (1) the patients exhibited reduced P1 amplitudes following validly than invalidly happy cues than did the healthy controls, indicating a positive attenuation at an early stage of automatic attention orientation; and (2) the patients exhibited enhanced whereas the controls showed reduced P3 amplitudes following validly than invalidly sad cues, suggesting a mood-congruent negative potentiation in depression at the later stage of top-down voluntary control of attention. Depressed patients show a negative bias in early attentional allocation, reflected by preferred engagement with mood-congruent and diminished engagement with positive emotional cues/stimuli.
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Affiliation(s)
- Xiang Ao
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,School of Psychology, Shenzhen University, Shenzhen, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Zhaoguo Wei
- Department of Clinical Psychology, Shenzhen Kangning Hospital, Shenzhen, China
| | - Wenwen Yu
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Fang Zhou
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Dandan Zhang
- Institute of Brain and Psychological Sciences, Sichuan Normal University, Chengdu, China.,School of Psychology, Shenzhen University, Shenzhen, China.,Shenzhen Institute of Neuroscience, Shenzhen, China.,Shenzhen-Hong Kong Institute of Brain Science, Shenzhen, China
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8
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Ma N, Lin Y, Mo L. 0281 Sleep Deprivation Impairs Cooperative Behavior Selectively: Evidence from Prisoner’s and Chicken Dilemmas. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.279] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Cooperation, the cornerstone of human interaction, has attracted much attention since it was indispensable in the contemporary world. However, little research has been done on whether sleep deprivation altered human cooperative behavior. In the present work, we investigated cooperation and sleep deprivation directly, aiming to evaluate the influences of acute sleep deprivation on cooperation with two classical social dilemmas, the Prisoner’s dilemma (PD) and the chicken dilemma (CD).
Methods
All participants (N=24) were required to come for the experiments twice, one time for normal sleep condition, the other time for sleep deprivation condition, with a counter-balanced sequence. In the following afternoon, participants completed the psychomotor vigilance task (PVT) and two social dilemmas tasks, as well as the Karolinska Sleepiness Scale (KSS), the Risk Orientation Questionnaire (ROQ) and the Positive and Negative Affect Schedule (PANAS).
Results
Our results demonstrated that sleep deprivation significantly impaired cooperative behaviors in the CD but not in the PD. In addition, this detrimental effect was not related with the alteration in the risk-seeking, objective alertness, subjective sleepiness, and mood.
Conclusion
The current findings revealed that sleep deprivation impairs human cooperative behaviors selectively. However, the underlying mechanism remains to further explore with neuroimaging studies and focus on the mediating role of general trust and sensitivity of loss.
Support
This research was supported by the National Natural Science Foundation of China (31500906), Guangdong Natural Science Funding - General Program (2019A1515012182).
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Affiliation(s)
- N Ma
- South China Normal University, Guangzhou, CHINA
| | - Y Lin
- South China Normal University, Guangzhou, CHINA
| | - L Mo
- South China Normal University, Guangzhou, CHINA
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9
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Xia L, Mo L, Wang J, Zhang W, Zhang D. Trait Anxiety Attenuates Response Inhibition: Evidence From an ERP Study Using the Go/NoGo Task. Front Behav Neurosci 2020; 14:28. [PMID: 32218724 PMCID: PMC7078641 DOI: 10.3389/fnbeh.2020.00028] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 12/01/2019] [Accepted: 02/07/2020] [Indexed: 12/25/2022] Open
Abstract
Neuropsychology and cognitive neuroscience have shown that anxious individuals have deficits in response inhibition. However, existing knowledge about the influence of trait anxiety on response inhibition is still inconsistent. The aim of this study was to investigate response inhibition between groups with high trait anxiety (HTA) and low trait anxiety (LTA). Here, we used event-related potential (ERP) indexes as biomarkers to examine the effect of trait anxiety on response inhibition using the Go/NoGo task. Behavioral results indicated that the HTA group made significantly lower accuracy than did the LTA group in the NoGo condition but not the Go condition. Meanwhile, the HTA group needed significantly longer overall response time (RT) than the LTA group did. ERP analyses revealed that the HTA group had smaller and later frontal NoGo-N2 as well as larger and later parietal NoGo-P3 compared to the LTA group. The two response inhibition-related ERP components are distinct neurophysiological indexes that, first, the NoGo-N2 is a component involved in the motor plan prior to the motor execution inhibitory process. Second, the NoGo-P3 reflects later monitoring and evaluation of the inhibition process. Accordingly, the current ERP findings suggest that HTA individuals’ response inhibition deficits are the consequence of abnormal premotor inhibition control and inefficient evaluation and monitoring. In addition, we also found that the peak amplitude of NoGo-N2 and NoGo-P3 were significantly correlated with the State–Trait Anxiety Inventory (STAI) scores after correction for multiple comparisons. To sum up, these results support the notion that trait anxious individuals have response inhibition deficits in the Go/NoGo task.
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Affiliation(s)
- Lisheng Xia
- School of Psychology, Guizhou Normal University, Guiyang, China
| | - Licheng Mo
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Jian Wang
- School of Electronics and Communication, Shenzhen Institute of Information Technology, Shenzhen, China
| | - Weifeng Zhang
- School of Electronics and Communication, Shenzhen Institute of Information Technology, Shenzhen, China
| | - Dandan Zhang
- School of Psychology, Shenzhen University, Shenzhen, China.,Shenzhen Institute of Neuroscience, Shenzhen, China
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Myers R, Mayo J, Tammemägi M, Atkar-Khattra S, Yuan R, Yee J, English J, Grant K, Lee A, Mcguire A, Mcwilliams A, Brims F, Mo L, Lam S. MA10.09 Evaluation of the Clinical Utility of the PanCan, EU-NELSON and Lung-RADS Protocols for Management of Screen Detected Lung Nodules at Baseline. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.580] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Crowther TW, van den Hoogen J, Wan J, Mayes MA, Keiser AD, Mo L, Averill C, Maynard DS. The global soil community and its influence on biogeochemistry. Science 2019; 365:365/6455/eaav0550. [DOI: 10.1126/science.aav0550] [Citation(s) in RCA: 316] [Impact Index Per Article: 63.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/18/2019] [Indexed: 12/17/2022]
Abstract
Soil organisms represent the most biologically diverse community on land and govern the turnover of the largest organic matter pool in the terrestrial biosphere. The highly complex nature of these communities at local scales has traditionally obscured efforts to identify unifying patterns in global soil biodiversity and biogeochemistry. As a result, environmental covariates have generally been used as a proxy to represent the variation in soil community activity in global biogeochemical models. Yet over the past decade, broad-scale studies have begun to see past this local heterogeneity to identify unifying patterns in the biomass, diversity, and composition of certain soil groups across the globe. These unifying patterns provide new insights into the fundamental distribution and dynamics of organic matter on land.
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O'Hanlan K, Sten M, Mo L, Halliday D, Struck D, O'Holleran M, Cuff J. The Safety of Incidental Appendectomy at the Time of Total Laparoscopic Hysterectomy. J Minim Invasive Gynecol 2018. [DOI: 10.1016/j.jmig.2018.09.481] [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] [Indexed: 11/28/2022]
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Liao D, Yu H, Han L, Zhong C, Ran X, Wang D, Mo L. Association of PON1 gene polymorphisms with polycystic ovarian syndrome risk: a meta-analysis of case-control studies. J Endocrinol Invest 2018; 41:1289-1300. [PMID: 29546656 DOI: 10.1007/s40618-018-0866-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 03/08/2018] [Indexed: 12/13/2022]
Abstract
PURPOSE Evidences showed that paraoxonase 1 (PON1) gene polymorphism has an impact on women's susceptibility to polycystic ovarian syndrome (PCOS) by influencing the expression and activity of PON1. However, the effects of three PON1 polymorphisms (- 108 C>T, L55M and Q192R) on the incidence of PCOS have generated inconsistent results. Here, we conducted a meta-analysis to investigate the association between PON1 polymorphisms and PCOS risk. METHODS All eligible trials were identified via systematic searches of multiple literature databases. Outcome data were synthesized by using crude odds ratio with 95% confidence interval. Heterogeneity was assessed with the I2 test. Publication bias and subgroup analyses were also performed. RESULTS A total of 2449 cases and 1977 controls from nine studies were selected for analysis. The pooled results showed a significant association between PCOS risk and PON1 - 108 C/T polymorphism in the following genetic models [allelic, 0.72 (0.56-0.92); homozygote, 0.51 (0.32-0.82); heterozygote, 0.44 (0.25-0.78); and dominant 0.47 (0.29-0.77)]. For the PON1 192 Q/R polymorphism, a significant relationship was found in the allelic model [0.62 (0.41-0.93)] and recessive model [0.61 (0.37-0.98)]. PCOS risk was also linked to PON1 L55M polymorphism in the heterozygote model [0.62 (0.39-0.98)] and dominant model [0.63 (0.41-0.96)]. CONCLUSIONS Our study has shown that PON1 - 108 C/T polymorphism might be associated with increased risk of PCOS under the allelic, homozygote, heterozygote, and dominant models. Additionally, PON1 192 Q/R and L55M polymorphisms were significantly related only in the allelic and recessive model, and in the heterozygote and dominant model, respectively.
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Affiliation(s)
- D Liao
- Department of Gynaecology and Obstetrics, Dongguan Third People's Hospital, Affiliated Dongguan Shilong People's Hospital of Southern Medical University, No. 1, Huangzhou Xianglong Road of Shilong Town, Dongguan, 523326, Guangdong, China
| | - H Yu
- Department of Gynaecology and Obstetrics, Dongguan Maternal and Child Health Hospital, Dongguan, China
| | - L Han
- Department of Gynaecology, Dongguan Changan Hospital, Dongguan, 523560, Guangdong, China
| | - C Zhong
- Department of Gynaecology and Obstetrics, Dongguan Third People's Hospital, Affiliated Dongguan Shilong People's Hospital of Southern Medical University, No. 1, Huangzhou Xianglong Road of Shilong Town, Dongguan, 523326, Guangdong, China
| | - X Ran
- Department of Gynaecology and Obstetrics, Dongguan Third People's Hospital, Affiliated Dongguan Shilong People's Hospital of Southern Medical University, No. 1, Huangzhou Xianglong Road of Shilong Town, Dongguan, 523326, Guangdong, China
| | - D Wang
- Department of Gynaecology and Obstetrics, Dongguan Third People's Hospital, Affiliated Dongguan Shilong People's Hospital of Southern Medical University, No. 1, Huangzhou Xianglong Road of Shilong Town, Dongguan, 523326, Guangdong, China
| | - L Mo
- Department of Gynaecology and Obstetrics, Dongguan Third People's Hospital, Affiliated Dongguan Shilong People's Hospital of Southern Medical University, No. 1, Huangzhou Xianglong Road of Shilong Town, Dongguan, 523326, Guangdong, China.
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Jia X, Jia L, Mo L, Yuan S, Zheng X, He J, Chen V, Guo Q, Zheng L, Yuan Q, Xu X, Zhou X. Berberine Ameliorates Periodontal Bone Loss by Regulating Gut Microbiota. J Dent Res 2018; 98:107-116. [PMID: 30199654 DOI: 10.1177/0022034518797275] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Postmenopausal osteoporosis (PMO) is a risk factor for periodontitis, and current therapeutics against PMO prevent the aggravated alveolar bone loss of periodontitis in estrogen-deficient women. Gut microbiota is recognized as a promising therapeutic target for PMO. Berberine extracted from Chinese medicinal plants has shown its effectiveness in the treatment of metabolic diseases such as obesity and diabetes via regulating gut microbiota. Here, we hypothesize that berberine ameliorates periodontal bone loss by improving the intestinal barriers by regulating gut microbiota under an estrogen-deficient condition. Experimental periodontitis was established in ovariectomized (OVX) rats, and the OVX-periodontitis rats were treated with berberine for 7 wk before sacrifice for analyses. Micro–computed tomography and histologic analyses showed that berberine treatment significantly reduced alveolar bone loss and improved bone metabolism of OVX-periodontitis rats as compared with the vehicle-treated OVX-periodontitis rats. In parallel, berberine-treated OVX-periodontitis rats harbored a higher abundance of butyrate-producing gut microbiota with elevated butyrate generation, as demonstrated by 16S rRNA sequencing and high-performance liquid chromatography analysis. Berberine-treated OVX-periodontitis rats consistently showed improved intestinal barrier integrity and decreased intestinal paracellular permeability with a lower level of serum endotoxin. In parallel, IL-17A-related immune responses were attenuated in berberine-treated OVX-periodontitis rats with a lower serum level of proinflammatory cytokines and reduced IL-17A+ cells in alveolar bone as compared with vehicle-treated OVX-periodontitis rats. Our data indicate that gut microbiota is a potential target for the treatment of estrogen deficiency–aggravated periodontal bone loss, and berberine represents a promising adjuvant therapeutic by modulating gut microbiota.
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Affiliation(s)
- X. Jia
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - L. Jia
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - L. Mo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - S. Yuan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X. Zheng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - J. He
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - V. Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Columbia University, New York, NY, USA
| | - Q. Guo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - L. Zheng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Q. Yuan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Dental Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X. Xu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X. Zhou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Operative Dentistry and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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15
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Gupta V, Mo L, Modi R, Munnur K, Nerlekar N, Cameron J, Seneviratne S, Joosten S, Hamilton G, Wong D. Apnoea–Hypopnoea Index is a Better Predictor than Measures of Hypoxemic Burden for Significant Coronary Artery Plaque Burden in Obstructive Sleep Apnoea. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.393] [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] [Indexed: 11/28/2022]
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16
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Kathiraser Y, Wang Z, Ang M, Mo L, Li Z, Oemar U, Kawi S. Highly active and coke resistant Ni/SiO 2 catalysts for oxidative reforming of model biogas: Effect of low ceria loading. J CO2 UTIL 2017. [DOI: 10.1016/j.jcou.2017.03.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Chen Y, Li Z, Mo L, Feng Z, Li R, Shi W, Liang X. Eosinophilia in Peritoneal Effluent Due To a Levonorgestrel-Releasing Intrauterine System in a Woman on Peritoneal Dialysis. Perit Dial Int 2017; 37:349-350. [PMID: 28512169 DOI: 10.3747/pdi.2016.00154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Y Chen
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
| | - Z Li
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
| | - L Mo
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China.,Department of Nephrology, Dongguan People's Hospital, Guangdong Province, China
| | - Z Feng
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
| | - R Li
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
| | - W Shi
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
| | - X Liang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academic of Medical Sciences, Guangzhou, China
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18
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Kang XW, Tong H, Cao KQ, Mo QF, Li LW, Hong GL, Mo L, Li D, Zhao GJ, Lu ZQ. [Value of base excess in predicting the prognosis of patients with paraquat poisoning]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2017; 35:25-29. [PMID: 28241698 DOI: 10.3760/cma.j.issn.1001-9391.2017.01.006] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore prognostic factors of acute paraquat poisoning (APP) , analyze the correlation between base excess (BE) and plasma concentration of paraquat (C-PQ) and discuss BE level in evalua-tion of prognosis of acute paraquat poisoning patients. Methods: We retrospectively selected 84 APP patients who admitted to Emergency Intensive Care Unit (EICU) of our hospital from 2009.9.1 to 2015.8.31.Clinical data from 84 APP patients were analyzed. BE、C-PQ、time of gastric lavagesince ingestion、time of hemoperfusion since ingestion、severity index of paraquat poisoning (SIPP) 、white blood cell (WBC) 、percentage of neutrophils (N%) 、hemoglobin (HB) 、creatinine (Cr) 、alanine aminotransferase (ALT) 、aspartate aminotransferase (AST) 、partial pressure of oxygen (PaO(2)) 、partial pressure of carbon dioxide (PaCO(2)) and other laboratory parameters were measured. A total of 41 patients in non-survivors died during the 30 days after admission and 43 patients in survivors survived during the 30 days. The factors of prognosis in paraquat poisoining and the role of BE in evalu-ating prognosis was analyzed, as well as the correlation between BE and C-PQ. Results: 1.Logistic regression analyses showed BE、C-PQ、ALT、AST、Cr was of prognostic significance[odds ratio (OR) of BE: 0.511, 95%CI 0.267, 0.978; C-PQ:-=0.999, 95%CI 0.999, 1.000; both P<0.05] ; 2.The area under the receiver operating characteristic curve (ROC curve) of BE、C-PQ and prognosis were 0.775、0.927 respectively, BE≤-1.7 mmol/L was the best cut-off value, the sensitivity、specificity for predicting were 82.9%、62.8%, the evaluation value was lower to C-PQ>3 273.935 ng/ml (AUC 0.927, 78.0%、95.3%) ; 3.BE negative correlated with C-PQ[-1.100 (-4.100, -0.200) , -5.900(-8.650, -2.500) , both P<0.05]. (r=-0.4, P<0.01). Conclusion: These results suggest that BE may be useful for the prediction of prognosis in PQ poisoning and BE negative correlated with C-PQ.
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Affiliation(s)
- X W Kang
- Emergency Department of the First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
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19
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Mo L, Liang DL, Madden A, Aung AK. A case of delayed onset pyroglutamic acidosis in the sub-acute setting. Intern Med J 2016; 46:747-9. [DOI: 10.1111/imj.13104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/03/2015] [Indexed: 11/29/2022]
Affiliation(s)
- L. Mo
- Department of General Medicine; Alfred Health; Melbourne Victoria Australia
| | - D. L. Liang
- Department of Medicine; Melbourne Health; Melbourne Victoria Australia
| | - A. Madden
- Department of General Medicine; Alfred Health; Melbourne Victoria Australia
| | - A. K. Aung
- Department of General Medicine; Alfred Health; Melbourne Victoria Australia
- Faculty of Medicine, Nursing and Health Sciences; Monash University; Melbourne Victoria Australia
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Oemar U, Kathiraser Y, Mo L, Ho XK, Kawi S. CO2reforming of methane over highly active La-promoted Ni supported on SBA-15 catalysts: mechanism and kinetic modelling. Catal Sci Technol 2016. [DOI: 10.1039/c5cy00906e] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Various Ni catalysts were synthesized by combining a high surface area SBA-15 support, a novel preparation method using an oleic acid precursor to obtain highly dispersed and small Ni particles, and the basic property of La.
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Affiliation(s)
- U. Oemar
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
| | - Y. Kathiraser
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
| | - L. Mo
- Department of Chemistry
- Institute of Catalysis
- Zhejiang University
- 310028 China
| | - X. K. Ho
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
| | - S. Kawi
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
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Ang ML, Miller JT, Cui Y, Mo L, Kawi S. Bimetallic Ni–Cu alloy nanoparticles supported on silica for the water-gas shift reaction: activating surface hydroxyls via enhanced CO adsorption. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01885d] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong CO adsorption activates surface OH for enhanced WGS activity.
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Affiliation(s)
- M. L. Ang
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
| | - J. T. Miller
- School of Chemical Engineering
- Purdue University
- West Lafayette
- USA
| | - Y. Cui
- School of Chemical Engineering
- Purdue University
- West Lafayette
- USA
| | - L. Mo
- Institute of Catalysis
- Department of Catalysis
- Zhejiang University
- Hangzhou
- 310028 China
| | - S. Kawi
- Department of Chemical and Biomolecular Engineering
- National University of Singapore
- 119260 Singapore
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22
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Bates JM, Flanagan K, Mo L, Ota N, Ding J, Ho S, Liu S, Roose-Girma M, Warming S, Diehl L. Dendritic cell CD83 homotypic interactions regulate inflammation and promote mucosal homeostasis. Mucosal Immunol 2015; 8:414-28. [PMID: 25204675 PMCID: PMC4326976 DOI: 10.1038/mi.2014.79] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 07/26/2014] [Indexed: 02/04/2023]
Abstract
Dendritic cells (DCs) form an extensive network in the intestinal lamina propria, which orchestrates the mucosal immune response. Alterations in DC function can predispose to inflammatory bowel disease, although by unknown mechanisms. We show that CD83, a highly regulated DC cell surface protein, modulates the immune response to prevent colitis. Mice with a conditional knockout of CD83 in DCs develop exacerbated colitis following dextran sodium sulfate challenge, whereas mucosal overexpression of CD83 inhibits DC inflammatory response and protects against colitis. These CD83 perturbations can be modeled in vitro where we show that CD83 homotypic interaction occurs via cell-cell contact and inhibits pro-inflammatory responses. CD83 knockdown or cytoplasmic truncation abrogates the effects of homotypic binding. We demonstrate that CD83 homotypic interaction regulates DC activation via the mitogen-activated protein kinase pathway by inhibiting p38α phosphorylation. Our findings indicate that CD83 homotypic interactions regulate DC activation and promote mucosal homeostasis.
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Affiliation(s)
- J M Bates
- Department of Pathology, Genetech, South San Francisco, California, USA
| | - K Flanagan
- Department of Pathology, Genetech, South San Francisco, California, USA
| | - L Mo
- Department of Pathology, Genetech, South San Francisco, California, USA
| | - N Ota
- Department of Immunology, Genetech, South San Francisco, California, USA
| | - J Ding
- Department of Immunology, Genetech, South San Francisco, California, USA
| | - S Ho
- Department of Pathology, Genetech, South San Francisco, California, USA
| | - S Liu
- Department of Pathology, Genetech, South San Francisco, California, USA
| | - M Roose-Girma
- Department of Molecular Biology, Genentech, South San Francisco, California, USA
| | - S Warming
- Department of Molecular Biology, Genentech, South San Francisco, California, USA
| | - L Diehl
- Department of Pathology, Genetech, South San Francisco, California, USA
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23
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Mo L, He J, Yue Q, Dong B, Huang X. Increased dosage of cyclosporine induces myopathy with increased seru creatine kinase in an elderly patient on chronic statin therapy. J Clin Pharm Ther 2014; 40:245-8. [PMID: 25512016 DOI: 10.1111/jcpt.12240] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 06/08/2014] [Accepted: 11/10/2014] [Indexed: 02/05/2023]
Abstract
WHAT IS KNOWN AND OBJECTIVE The concomitant administration of atorvastatin and cyclosporine has been shown to increase the serum concentration of 3-hydroxy-3-methylglutaryl coenzyme A, which may be associated with the elevation of creatine kinase and an increased risk of myopathy. Our objective is to report on a case of statin-induced myopathy associated with concomitant use of cyclosporine and other contributing factors. CASE SUMMARY An 88-year-old Chinese male patient with comorbidities received polypharmacy treatment, including atorvastatin and cyclosporine. After the dosage of cyclosporine was increased to 300 mg every day for 8 months, the patient developed body pain and leg weakness, with a serum creatine kinase increase and evidence on magnetic resonance imaging of muscle oedema. WHAT IS NEW AND CONCLUSION Cyclosporine is a moderate inhibitor of the cytochrome P450 CYP3A4 isoenzyme, which is known to increase the serum level of atorvastatin. We hypothesized that the pharmacological and pharmacokinetic properties of atorvastatin-induced myopathy are the result of its interaction with high dosage of cyclosporine.
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Affiliation(s)
- L Mo
- The Center of Gerontology and Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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24
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Ang ML, Oemar U, Saw ET, Mo L, Kathiraser Y, Chia BH, Kawi S. Highly Active Ni/xNa/CeO2 Catalyst for the Water–Gas Shift Reaction: Effect of Sodium on Methane Suppression. ACS Catal 2014. [DOI: 10.1021/cs500915p] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- M. L. Ang
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
| | - U. Oemar
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
| | - E. T. Saw
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
| | - L. Mo
- Institute
of Catalysis, Department of Chemistry, Zhejiang University, Tianmushan
Road 148, Hangzhou, Zhejiang 310028, PR China
| | - Y. Kathiraser
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
| | - B. H. Chia
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
| | - S. Kawi
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, Singapore 117576
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25
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Mo L, Myrstad M, Sangnes I, Henriksen A, Ranhoff A. Maintaince of physical capacity in elderly cross-country skiers. Longitudinal observations from the Birkebeiner Ageing Study. Eur Geriatr Med 2013. [DOI: 10.1016/j.eurger.2013.07.408] [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] [Indexed: 11/27/2022]
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26
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Zhou J, Yang H, Deng Q, Gu X, He P, Lin Y, Zhao M, Jiang J, Chen H, Lin Y, Yin W, Mo L, He J. Oncogenic driver mutations in patients with non-small-cell lung cancer at various clinical stages. Ann Oncol 2013; 24:1319-25. [DOI: 10.1093/annonc/mds626] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Wu H, Xia T, Wei X, Chen L, Mo L, Yu B, Xia X, Jiang X. Relationship between diffusion-weighted imaging and Bcl-2 expression in rabbit models of hepatic VX2 tumors after radiotherapy. J BIOL REG HOMEOS AG 2013; 27:487-495. [PMID: 23830398] [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: 06/02/2023]
Abstract
The paper aims to study diffusion-weighted imaging (DWI) and Bcl-2 gene expression in hepatic VX2 tumors after three-dimensional conformal radiotherapy (3D-CRT), we successfully developed 40 rabbit models with hepatic VX2 tumors. 3D-CRT was performed on 28 rabbit hepatic VX2 tumors, which were then randomly and evenly divided into four groups. The remaining 12 controls did not receive radiotherapy. Conventional and DWI was performed at 1, 5, 10, and 15 days following radiation therapy. We measured apparent diffusion coefficients (ADCs) in both a region of interest (ROI) of the VX2 tumor tissue and normal liver tissue and then calculated the ratio between them. RT-PCR was performed to detect the expression of the anti-apoptotic gene Bcl-2. On days 5 and 10, the ADC ratios of the radiotherapy groups were 1.322+-0.270 and 0.964+-0.341, respectively. On days 5, 10, and 15, Bcl-2 gene expression in the radiotherapy group was 0.563+-0.284, 0.421+-0.242, and 0.314+-0.152, respectively. For all three days, the gene expression values from the radiotherapy group were significantly lower than that in the control group (P less than 0.01). Statistical analysis revealed that ADC ratio and Bcl-2 gene expression were significantly negatively correlated (r=-0.493, P less than 0.01). Our results demonstrated that DWI sequence can reflect molecular changes at different time points for hepatic VX2 tumors following radiotherapy.
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Affiliation(s)
- H Wu
- Department of Medical Imaging, Guangzhou First People's Hospital, Guangzhou, China
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Liao M, Ye F, Zhang B, Huang L, Xiao Q, Qin M, Mo L, Tan A, Gao Y, Lu Z, Wu C, Zhang Y, Zhang H, Qin X, Hu Y, Yang X, Mo Z. Erratum: Genome-wide association study identifies common variants at TNFRSF13B associated with IgG level in a healthy Chinese male population. Genes Immun 2012. [DOI: 10.1038/gene.2012.31] [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] [Indexed: 11/09/2022]
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He X, Mo L, Li ZY, Tan ZR, Chen Y, Ouyang DS. Effects of curcumin on the pharmacokinetics of talinolol in human withABCB1polymorphism. Xenobiotica 2012; 42:1248-54. [DOI: 10.3109/00498254.2012.697590] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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30
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Liao M, Ye F, Zhang B, Huang L, Xiao Q, Qin M, Mo L, Tan A, Gao Y, Lu Z, Wu C, Zhang Y, Zhang H, Qin X, Hu Y, Yang X, Mo Z. Genome-wide association study identifies common variants at TNFRSF13B associated with IgG level in a healthy Chinese male population. Genes Immun 2012; 13:509-13. [DOI: 10.1038/gene.2012.26] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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31
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Ye Y, Hou R, Chen J, Mo L, Zhang J, Huang Y, Mo Z. Formononetin-induced apoptosis of human prostate cancer cells through ERK1/2 mitogen-activated protein kinase inactivation. Horm Metab Res 2012; 44:263-7. [PMID: 22328166 DOI: 10.1055/s-0032-1301922] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Formononetin is a main active component of red clover plants (Trifolium pratense L.), and is considered as a phytoestrogen. Our previous studies demonstrated that formononetin caused cell cycle arrest at the G0/G1 phase by inactivating insulin-like growth factor 1(IGF1)/IGF1R-phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) pathway in MCF-7 cells. In the present study, we investigated the molecular mechanisms involved in the effect of formononetin on prostate cancer cells. Our results suggested that higher concentrations of formononetin inhibited the proliferation of prostate cancer cells (LNCaP and PC-3), while the most striking effect was observed in LNCaP cells. We further found that formononetin inactivated extracellular signal-regulated kinase1/2 (ERK1/2) mitogen-activated protein kinase (MAPK) signaling pathway in a dose-dependent manner, which resulted in increased the expression levels of BCL2-associated X (Bax) mRNA and protein, and induced apoptosis in LNCaP cells. Thus, we concluded that the induced apoptosis effect of formononetin on human prostate cancer cells was related to ERK1/2 MAPK-Bax pathway. Considering that red clover plants were widely used clinically, our results provided the foundation for future development of different concentrations formononetin for treatment of prostate cancer.
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Affiliation(s)
- Y Ye
- Department of Emergency, First Affiliated Hospital of Guangxi Medical University, Nanning, China
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32
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Mo L, Bignell L, Steele T, Alexiev D. Activity measurements of 3H using the TDCR method and observation of source stability. Appl Radiat Isot 2010; 68:1540-2. [DOI: 10.1016/j.apradiso.2009.11.059] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bignell L, Mo L, Alexiev D, Hashemi-Nezhad S. Sensitivity and uncertainty analysis of the simulation of 123I and 54Mn gamma and X-ray emissions in a liquid scintillation vial. Appl Radiat Isot 2010; 68:1495-502. [DOI: 10.1016/j.apradiso.2009.11.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mo L, Neff NH, Hadjiconstantinou M. Regulation of JNK signalling pathway by GM1. J Neurochem 2008. [DOI: 10.1046/j.1471-4159.81.s1.38_5.x] [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] [Indexed: 11/20/2022]
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Mo L, Reinhard MI, Davies JB, Alexiev D, Baldock C. Calibration of the Capintec CRC-712M dose calibrator for 18F. Appl Radiat Isot 2006; 64:485-9. [PMID: 16293417 DOI: 10.1016/j.apradiso.2005.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [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: 01/06/2005] [Revised: 07/26/2005] [Accepted: 09/28/2005] [Indexed: 10/25/2022]
Abstract
Primary standardisation was performed on a solution of (18)F using the 4pibeta-gamma coincidence counting efficiency-tracing extrapolation method with (60)Co used as a tracer nuclide. The result was used to calibrate the ANSTO secondary standard ionisation chamber which is used to disseminate Australian activity standards for gamma emitters. Using the secondary activity standard for (18)F, the Capintec CRC-712M dose calibrator at the Australian National Medical Cyclotron (NMC) Positron Emission Tomography (PET) Quality Control (QC) Section was calibrated. The dial setting number recommended by the manufacturer for the measurement of the activity of (18)F is 439. In this work, the dial setting numbers for the activity measurement of the solution of (18)F in Wheaton vials were experimentally determined to be 443+/-12, 446+/-12, 459+/-11, 473+/-15 for 0.1, 1, 4.5 and 9ml solution volumes, respectively. The uncertainties given above are expanded uncertainties (k=2) giving an estimated level of confidence of 95%. The activities determined using the manufacturer recommended setting number 439 are 0.8%, 1.4%, 4.0% and 6.5% higher than the standardised activities, respectively. It is recommended that a single dial setting number of 459 determined for 4.5ml is used for 0.1-9ml solution in Wheaton vials in order to simplify the operation procedure. With this setting the expended uncertainty (k=2) in the activity readout from the Capintec dose calibrator would be less than 6.2%.
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Affiliation(s)
- L Mo
- Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW 2234, Australia.
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Mo L, Cheng J, Lee E, Sun T, Wu X. Gene Deletion in Urothelium by Specific Expression of Cre Recombinase. J Urol 2006. [DOI: 10.1016/s0022-5347(05)00869-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- L. Mo
- Department of Urology, New York University Cancer Institute, New York University School of Medicine, New York, New York
| | - J. Cheng
- Department of Urology, New York University Cancer Institute, New York University School of Medicine, New York, New York
| | - E.Y. Lee
- Department of Urology, New York University Cancer Institute, New York University School of Medicine, New York, New York
| | - T.T. Sun
- Department of Urology, New York University Cancer Institute, New York University School of Medicine, New York, New York
| | - X.R. Wu
- Department of Urology, New York University Cancer Institute, New York University School of Medicine, New York, New York
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Mo L, Huang HY, Zhu XH, Shapiro E, Hasty D, Wu XR. Tamm-Horsfall Protein is a Critical Renal Defense Factor Protecting Against Calcium Oxalate Crystal Formation. J Urol 2006. [DOI: 10.1016/s0022-5347(05)00093-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- L. Mo
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
| | - H.-Y. Huang
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
| | - X.-H. Zhu
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
| | - E. Shapiro
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
| | - D.L. Hasty
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
| | - X.-R. Wu
- Departments of Urology and Microbiology, Kaplan Comprehensive Cancer Center, New York University School of Medicine, and Veterans Affairs Medical Center, New York, New York, and Department of Anatomy and Neurobiology, University of Tennessee and Veterans Affairs Medical Center, Memphis, Tennessee
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Davies JB, Mo L, Alexiev D. Development of an Australian secondary standard for the reference air kerma rate measurement of125I seeds. Australas Phys Eng Sci Med 2005; 28:196-9. [PMID: 16250476 DOI: 10.1007/bf03178716] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Calibration of a High-Dose-Rate 1000 Plus ionisation chamber and associated electrometer for the determination of reference air kerma rate for 125I brachytherapy seeds has been developed. Traceability was established from ionisation chamber measurements of an Amersham model 6711 125I seed for which a primary standard measurement of reference air kerma rate has been made by the National Institute of Standards and Technology. The status of an Australian secondary standard is to be realised by establishing legal verifying authority from the National Measurement Institute. The calibrated chamber thus provides a measurement from which similar chambers in hospitals may be calibrated. For quality assurance this result was compared with the calibration certificate supplied by the Accredited Dosimetry Calibration Laboratory of the University of Wisconsin, USA.
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Affiliation(s)
- J B Davies
- Safety & Radiation Science, Australian Nuclear Science & Technology Organisation, Menai, Australia.
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Mo L, Avci B, James D, Simpson B, Van Wyngaardt WM, Cessna JT, Baldock C. Development of activity standard for 90Y microspheres. Appl Radiat Isot 2005; 63:193-9. [PMID: 15963429 DOI: 10.1016/j.apradiso.2005.02.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 11/28/2004] [Revised: 01/26/2005] [Accepted: 02/14/2005] [Indexed: 10/25/2022]
Abstract
(90)Y microspheres are important therapeutic radiopharmaceuticals used in the treatment of liver cancer through a process known as selective internal radiation therapy. SIR-spheres is a radiopharmaceutical product that is comprised of (90)Y microspheres suspended in sterile, pyrogen-free water for injection into patients. It is necessary to establish for the SIR-spheres production the capability of accurately measuring the activity of this product to a traceable national measurement standard. An activity standard for SIR-spheres was developed from a standard for (90)Y solution, employing a highly quantifiable chemical digestion process. Calibration factors for the manufacturer's ionisation chambers were determined for 1 and 5 ml of the SIR-spheres product placed in Wheaton vials, for both 34% and 44% of (90)Y microsphere concentration.
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Affiliation(s)
- L Mo
- Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia.
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Abstract
ClC-5 chloride channels and epithelial sodium channels (ENaC) are present in many cell types including airway and retinal epithelia. Since ENaC activity is known to be affected by chloride transport, we co-injected Xenopus oocytes with cRNAs encoding ENaC and ClC-5 to investigate whether channel currents are impacted by heterologous co-expression of these proteins. ClC-5 currents were not detectably affected by co-expression with ENaC, whereas amiloride-sensitive ENaC currents were significantly lower compared to control oocytes expressing ENaC alone. Co-expression of ENaC with cRNA sequences encoding non-conducting fragments of ClC-5 revealed that the amino acid sequence region between positions 347 and 647 was sufficient for inhibition of ENaC currents. Co-expression of ENaC and another transport protein, the sodium dicarboxylate co-transporter (NaDC-1), did not affect ENaC currents. To test whether the inhibitory effects of ClC-5 were specific for ENaC, ClC-5 was also co-expressed with CFTR. CFTR currents were also inhibited by co-expression with ClC-5, whereas ClC-5 currents were unaffected. Western blot analysis of biotinylated oocyte surface membranes revealed that the co-expression of ClC-5 with ENaC, CFTR, or NaDC-1 decreased the abundance of these proteins at the surface membrane. We conclude that overexpression of ClC-5, specifically amino acids 347-647, can alter the normal translation or trafficking of ENaC and other ion transport proteins by a mechanism that is independent of the chloride conductance of ClC-5.
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Affiliation(s)
- L Mo
- Department of Neuroscience, University of Texas Medical Branch, Galveston, TX 77555, USA
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Mo L, Zhang W, Wang J, Weng X, Chen S, Shao L, Pang M, Chen Z. Three-dimensional model and molecular mechanism of Mycobacterium tuberculosis catalase-peroxidase (KatG) and isoniazid-resistant KatG mutants. Microb Drug Resist 2005; 10:269-79. [PMID: 15650370 PMCID: PMC2865223 DOI: 10.1089/mdr.2004.10.269] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mycobacterium tuberculosis KatG enzyme functions both as catalase for removing hydrogen peroxide (H(2)O(2)) and as peroxidase for oxidating isoniazid (INH) to active form of anti-tuberculosis drug. Although mutations in M. tuberculosis KatG confer INH resistance in tuberculous patients, structural bases for INH-resistant mutations in the KatG gene remains poorly understood. Here, three M. tuberculosis KatG mutants bearing Arg418--> Gln, Ser315 --> Thr, or Trp321 --> Gly replacement were assessed for changes in catalase-peroxidase activities and possible structure bases relevant to such changes. These three M. tuberculosis KatG mutants exhibited a marked impairment or loss of catalase-peroxidase activities. The possible structural bases for the mutant-induced loss of enzyme activities were then analyzed using a three-dimensional model of M. tuberculosis KatG protein constructed on the basis of the crystal structure of the catalase-peroxidase from Burkholderia pseudomallei. The model suggests that three M. tuberculosis KatG mutants bearing Arg418 --> Gln, Ser315 -->Thr, or Trp321--> Gly replacement affect enzyme activities by different mechanisms, although each of them impacts consequently on a heme-associated structure, the putative oxidative site. Moreover, in addition to the widely accepted substrate-binding site, M. tuberculosis KatG may bear another H(2)O(2) binding site. This H(2)O(2) binding site appears to interact with the catalytic site by a possible electron-transfer chain, a Met255-Tyr229-Trp107 triad conserved in many catalase-peroxidases. The Ser315 --> Thr mutant may have direct effect on the catalytic site by interfering with electron transfer in addition to the previously proposed mechanism of steric constraint.
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Affiliation(s)
- L. Mo
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
| | - W. Zhang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
- Harvard Medical School, Boston MA 02215, and University of Illinois, Chicago, IL 60612
| | - J. Wang
- Institute of Biochemistry and Cell Biology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - X.H. Weng
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
| | - S. Chen
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
| | - L.Y. Shao
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
| | - M.Y. Pang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, and Huashan Hospital, Fudan University, Shanghai, China 200433
| | - Z.W. Chen
- Harvard Medical School, Boston MA 02215, and University of Illinois, Chicago, IL 60612
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Mo L, Xiong W, Qian T, Sun H, Wills NK. Coexpression of complementary fragments of ClC-5 and restoration of chloride channel function in a Dent's disease mutation. Am J Physiol Cell Physiol 2004; 286:C79-89. [PMID: 13679301 DOI: 10.1152/ajpcell.00009.2003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The human hereditary disorder Dent's disease is linked to loss-of-function mutations of the chloride channel ClC-5. Many of these mutations involve insertion of premature stop codons, resulting in truncation of the protein. We determined whether the functional activity of ClC-5 could be restored by coexpression of the truncated protein (containing the NH2-terminal region) with its complementary “missing” COOH-terminal region. Split channel constructs for ClC-5, consisting of complementary N and C protein regions, were created at an arbitrary site in the COOH-terminal region (V655) and at four Dent's disease mutation sites (R347, Y617, R648, and R704). Coexpression of complementary fragments for the split channel at V655 produced currents with anion and pH sensitivity similar to those of wild-type ClC-5. Channel activity was similarly restored when complementary split channel constructs made for Dent's mutation R648 were coexpressed, but no ClC-5 currents were found when split channels for mutations R347, Y617, or R704 were coexpressed. Immunoblot and immunofluorescence studies of COS-7 cells revealed that N or C protein fragments could be transiently expressed and detected in the plasma membrane, even in split channels that failed to show functional activity. The results suggest that ClC-5 channel activity can be restored for specific Dent's mutations by expression of the missing portion of the ClC-5 molecule.
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Affiliation(s)
- L Mo
- Departments of Physiology & Biophysics, University of Texas Medical Branch, Galveston, TX 77555-0641, USA
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Abstract
DNA repair has an essential role in protecting the genome from damage by endogenous and environmental agents. Polymorphisms in DNA repair genes and differences in repair capacity between individuals have been widely documented. For colorectal cancer, the loss of mismatch repair gene activity is a key genetic determinant. Nucleotide excision repair (NER), recombination repair (RR) and base excision repair (BER) pathways have critical roles in protection against other cancers, and we wished to investigate their role in colorectal cancer. We have compared the frequency of polymorphisms in the NER genes, XPD, XPF, XPG, ERCC1; in the BER gene, XRCC1; and in the RR gene, XRCC3; in colorectal cancer patients and in a control group. No significant associations were found for any of the NER gene polymorphisms or for the XRCC1 polymorphism. The C allele (position 18067) of the XRCC3 gene was weakly but significantly associated with colorectal cancer (odds ratio 1.52, 95% confidence interval 1.04-2.22, P=0.03). For all patients who were heterozygous for any of the repair genes studied, tumour tissue was investigated for loss of heterozygosity (LOH). Only one example of LOH was found for all the genes examined. From the association and LOH data, we conclude that these genes do not have an important role in protection against colorectal carcinogenesis.
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Affiliation(s)
- R Mort
- Sir Alastair Currie Cancer Research UK Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
| | - L Mo
- Sir Alastair Currie Cancer Research UK Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
| | - C McEwan
- Sir Alastair Currie Cancer Research UK Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
| | - D W Melton
- Sir Alastair Currie Cancer Research UK Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
- Sir Alastair Currie Cancer Research UK Laboratories, Molecular Medicine Centre, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK. E-mail:
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Abstract
A review is given of the use of germanium detectors for gamma spectroscopy. The advantages, principles of operation, and fabrication processes of semiconductor radiation detectors are described.
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Affiliation(s)
- D Alexiev
- Australian Nuclear Science and Technology Organisation, NSW.
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Abstract
Genetic mutations of the Cl(-) channel ClC-5 cause Dent's disease in humans. We recently cloned an amphibian ortholog of Xenopus ClC-5 (xClC-5) from the A6 cell line. We now compare the properties and regulation of ClC-5 currents expressed in mammalian (COS-7) cells and Xenopus oocytes. Whole cell currents in COS-7 cells transfected with xClC-5 cDNA had strong outward rectification, Cl(-) > I(-) anion sensitivity, and were inhibited at low pH, similar to previous results in oocytes. In oocytes, antisense xClC-5 cRNA injection had no effect on endogenous membrane currents or the heterologous expression of human ClC-5. Activators of cAMP and protein kinase C inhibitors had no significant effects on ClC-5 currents expressed in either COS-7 cells or oocytes, whereas H-89, a cAMP-dependent protein kinase (PKA) inhibitor, and hydrogen peroxide decreased the currents. We conclude that the basic properties of ClC-5 currents were independent of the host cell type used for expression. In addition, ClC-5 channels may be modulated by PKA and reactive oxygen species.
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Affiliation(s)
- T X Weng
- Department of Physiology and Biophysics, University of Texas Medical Branch, Galveston, TX 77555, USA
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Affiliation(s)
- L Mo
- Hospital for Special Surgery, Cornell University, New York, NY, USA
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Mo L, Leu SJ, Berry C, Liu F, Olee T, Yang YY, Beardsley DS, McMillan R, Woods VL, Chen PP. The frequency of homozygous deletion of a developmentally regulated Vh gene (Humhv3005) is increased in patients with chronic idiopathic thrombocytopenic purpura. Autoimmunity 2001; 24:257-63. [PMID: 9147584 DOI: 10.3109/08916939608994718] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Little is known of the genetic factors that may contribute to the development of chronic idiopathic thrombocytopenic purpura (cITP). We have previously shown that a developmentally regulated Vh gene (Humhv3005) is absent in 10/41 (24%) of patients with systemic lupus erythematosus while it is absent in only 7/88 (8%) of normal controls. This finding suggests that a homozygous deletion of an Ig variable (V) gene may alter the immune system and thus predispose the host to an autoimmune disorder. We have analyzed the same gene in 44 patients with cITP and found that Humhv3005 and like genes were absent in a higher percentage of patients (14 of 44, 31.8%) than they were absent in either normals (7/88, 8%, p = 0.002) or thrombocytopenic patients without cITP (6/53, 11.3%, p = 0.042); the hv3005 deletion frequency in the latter group did not differ from that in normals (P = 0.74). These data suggest that deletions of Humhv3005 and/or highly homologous Vh genes may predispose individuals to the development of cITP, and may contribute toward production of pathogenic antiplatelet antibodies.
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Affiliation(s)
- L Mo
- Department of Medicine, University of California, San Diego, La Jolla 92093-0663, USA
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Hörkkö S, Olee T, Mo L, Branch DW, Woods VL, Palinski W, Chen PP, Witztum JL. Anticardiolipin antibodies from patients with the antiphospholipid antibody syndrome recognize epitopes in both beta(2)-glycoprotein 1 and oxidized low-density lipoprotein. Circulation 2001; 103:941-6. [PMID: 11181467 DOI: 10.1161/01.cir.103.7.941] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND We recently suggested that many anticardiolipin antibodies bind only to oxidized cardiolipin (OxCL) and/or to OxCL-beta(2)-glycoprotein 1 (beta(2)GP1) adducts but not to a "reduced" cardiolipin that is unable to undergo oxidation. To test this hypothesis, we investigated 24 sera, 4 protein A-purified IgG fractions, and 3 human monoclonal antibodies that were all isolated from patients with antiphospholipid antibody syndrome (APS); testing was also performed in 7 controls. Two monoclonal antibodies (IS3 and IS4) were selected for binding to CL and one was selected for binding to beta(2)GP1 (LJB8). METHODS AND RESULTS By chemiluminescent immunoassay, all APS sera samples bound only to OxCL and not to reduced CL, and the binding was inhibited >95% by OxCL but not reduced CL. All purified IgG fractions bound to beta(2)GP1 but only when the beta(2)GP1 was plated on microtiter wells coated with OxCL. All 3 monoclonal antibodies bound only to OxCL. On Western blots, IS4 and LJB8 bound to beta(2)GP1 as well as to delipidated apoB of oxidized LDL but not to native apoB. IS3 also bound to oxidized apoB on Western blot. Covalent modification of beta(2)GP1 with oxidation products of CL made it more antigenic for APS serum samples, for purified IgG fractions, and for the monoclonal antibodies. CONCLUSIONS These data support the hypothesis that oxidation of CL is needed to generate epitopes for many anticardiolipin antibodies and that some of these epitopes are covalent adducts of OxCL with beta(2)GP1 or apoB.
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Affiliation(s)
- S Hörkkö
- Department of Medicine, University of California, San Diego, USA.
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Wills NK, Weng T, Mo L, Hellmich HL, Yu A, Wang T, Buchheit S, Godley BF. Chloride channel expression in cultured human fetal RPE cells: response to oxidative stress. Invest Ophthalmol Vis Sci 2000; 41:4247-55. [PMID: 11095622] [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] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
PURPOSE The human fetal cell line RPE 28 SV4 has been useful for studies of oxidative stress and apoptosis in retinal pigmented epithelium. This cell model is now assessed in functional investigations of chloride channel activity. The study aims to determine the presence of specific chloride channels, including CFTR and ClC channels, to identify the properties of membrane chloride currents and to assess their modulation by hydrogen peroxide, cAMP, and other agents. METHODS Channel expression was determined using RT-PCR and cDNA cloning and biochemical and immunocytochemical methods. Membrane currents were analyzed using whole-cell, patch-clamp techniques. RESULTS RT-PCR results confirmed the presence of ClC-5 mRNA, and a full-length clone encoding ClC-3 was isolated from a cDNA library for RPE 28 SV4 cells. Specific staining for CFTR and several ClC channels was detected by immunocytochemistry. Whole-cell chloride currents (under conditions of symmetrical chloride concentrations) averaged 16.9 +/- 3.4 pA/pF (at +100 mV; n = 8), showed outward rectification, and had an anion permeability sequence of Cl(-) > I(-) > cyclamate. Currents were stimulated by cAMP cocktail (250 microM cAMP, 100 microM IBMX, and 25 microM forskolin) and were inhibited by 1 mM DIDS. The oxidative agent hydrogen peroxide (100 microM) decreased the current by 34% +/- 10% (n = 4). CONCLUSIONS. These findings suggest that RPE 28 SV4 cells possess regulated chloride channels including CFTR and members of the ClC chloride channel family. The inhibition of chloride currents by H(2)O(2) suggests that this cell line may be advantageous for studies of chloride channel modulation by oxidative stress.
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Affiliation(s)
- N K Wills
- Departments of Physiology, University of Texas Medical Branch, Galveston, Texas, USA.
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