1
|
Luo W, He W, Liang L, Liang Y, Zhang S, Liao G. The 'D-M-C' strategy for conventional ameloblastoma of the mandible: a retrospective study. Int J Oral Maxillofac Surg 2024:S0901-5027(24)00091-2. [PMID: 38670888 DOI: 10.1016/j.ijom.2024.03.014] [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: 12/01/2023] [Revised: 03/08/2024] [Accepted: 03/12/2024] [Indexed: 04/28/2024]
Abstract
The purpose of this multicentre study was to evaluate the efficacy of the 'dredging-marsupialization-curettage' (D-M-C) strategy in the treatment of conventional intraosseous ameloblastoma of the mandible. A total of 31 patients from three institutions, who had a pathological diagnosis of conventional ameloblastoma of the mandible, were treated with the D-M-C strategy. The surgical protocol comprised a dredging and marsupialization (D-M) step, with additional D-M steps as required. The patients then underwent curettage (C) once an obvious effect of the D-M step had been achieved during follow-up. Eight patients were followed up for ≥36 months but <60 months, while 23 were followed up for ≥60 months. Nineteen of the 23 patients followed up for ≥60 months were disease-free at the last follow-up, with no evidence of recurrence. The D-M step is effective for reducing the tumour size and preserving vital structures. The D-M-C surgical strategy may be a feasible treatment option for conventional ameloblastoma of the mandible.
Collapse
Affiliation(s)
- W Luo
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - W He
- Oral and Maxillofacial Surgery Department of Second Affiliated Hospital, School of Medicine, Chinese University of Hong Kong, Shenzhen, and Longgang District People's Hospital of Shenzhen, Shenzhen, China
| | - L Liang
- Department of Oral and Maxillofacial Surgery, Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, Guangdong, China
| | - Y Liang
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - S Zhang
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - G Liao
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China.
| |
Collapse
|
2
|
Zhao S, Cao W, Liao G, Guo Z, Xu L, Shen C, Chang C, Liang X, Wang K, He D, Sun S, Chen R, Dominici F. All cause and cause specific mortality associated with transition to daylight saving time in US: nationwide, time series, observational study. BMJ Med 2024; 3:e000771. [PMID: 38464392 PMCID: PMC10921520 DOI: 10.1136/bmjmed-2023-000771] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/28/2023] [Indexed: 03/12/2024]
Abstract
Objectives To estimate the association between the transition to daylight saving time and the risks of all cause and cause specific mortality in the US. Design Nationwide time series observational study based on weekly data. Setting US state level mortality data from the National Center for Health Statistics, with death counts from 50 US states and the District of Columbia, from the start of 2015 to the end of 2019. Population 13 912 837 reported deaths in the US. Main outcome measures Weekly counts of mortality for any cause, and for Alzheimer's disease, dementia, circulatory diseases, malignant neoplasms, and respiratory diseases. Results During the study period, 13 912 837 deaths were reported. The analysis found no evidence of an association between the transition to spring daylight saving time (when clocks are set forward by one hour on the second Sunday of March) and the risk of all cause mortality during the first eight weeks after the transition (rate ratio 1.003, 95% confidence interval 0.987 to 1.020). Autumn daylight saving time is defined in this study as the time when the clocks are set back by one hour (ie, return to standard time) on the first Sunday of November. Evidence indicating a substantial decrease in the risk of all cause mortality during the first eight weeks after the transition to autumn daylight saving time (0.974, 0.958 to 0.990). Overall, when considering the transition to both spring and autumn daylight saving time, no evidence of any effect of daylight saving time on all cause mortality was found (0.988, 0.972 to 1.005). These patterns of changes in mortality rates associated with transition to daylight saving time were consistent for Alzheimer's disease, dementia, circulatory diseases, malignant neoplasms, and respiratory diseases. The protective effect of the transition to autumn daylight saving time on the risk of mortality was more pronounced in elderly people aged ≥75 years, in the non-Hispanic white population, and in those residing in the eastern time zone. Conclusions In this study, transition to daylight saving time was found to affect mortality patterns in the US, but an association with additional deaths overall was not found. These findings might inform the ongoing debate on the policy of shifting daylight saving time.
Collapse
Affiliation(s)
- Shi Zhao
- School of Public Health, Tianjin Medical University, Tianjin, China
- Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, China
| | - Wangnan Cao
- Department of Social Medicine and Health Education, School of Public Health, Peking University, Beijing, China
| | - Gengze Liao
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, China
| | - Zihao Guo
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, China
| | - Lufei Xu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Human Resources, Peking University Cancer Hospital and Institute, Beijing, China
| | - Chen Shen
- MRC Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, UK
- National Institute for Health Research Health Protection Research Unit in Chemical and Radiation Threats and Hazards, Imperial College London, London, UK
| | - Chun Chang
- Department of Social Medicine and Health Education, School of Public Health, Peking University, Beijing, China
| | - Xiao Liang
- Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong, China
| | - Kai Wang
- Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi, China
| | - Daihai He
- Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong, China
| | - Shengzhi Sun
- School of Public Health, Capital Medical University, Beijing, China
- Beijing Municipal Key Laboratory of Clinical Epidemiology, Capital Medical University, Beijing, China
| | - Rui Chen
- School of Public Health, Capital Medical University, Beijing, China
| | - Francesca Dominici
- Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA
| |
Collapse
|
3
|
Liao G, Wang F, Lu S, Yu YHK, Arrandale VH, Chan AHS, Tse LA. Assessing Neurobehavioral Alterations Among E-waste Recycling Workers in Hong Kong. Saf Health Work 2024; 15:9-16. [PMID: 38496288 PMCID: PMC10944145 DOI: 10.1016/j.shaw.2023.12.004] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/24/2023] [Accepted: 12/26/2023] [Indexed: 03/19/2024] Open
Abstract
Background E-waste workers in Hong Kong are handling an unprecedented amount of e-waste, which contains various neurotoxic chemicals. However, no study has been conducted to evaluate the neurological health status of e-waste workers in Hong Kong. This study aimed to evaluate the prevalence of neurobehavioral alterations and to identify the vulnerable groups among Hong Kong e-waste workers. Methods We recruited 109 Hong Kong e-waste workers from June 2021 to September 2022. Participants completed standard questionnaires and wore a GENEActiv accelerometer for seven days. Pittsburgh Sleep Quality Index and Questionnaire 16/18 (Q16/18) were used to assess subjective neurobehavioral alterations. The GENEActiv data generated objective sleep and circadian rhythm variables. Workers were grouped based on job designation and entity type according to the presumed hazardous level. Unconditional logistic regression models measured the associations of occupational characteristics with neurobehavioral alterations after adjusting for confounders. Results While dismantlers/repairers and the workers in entities not funded by the government were more likely to suffer from neurotoxic symptoms in Q18 (adjusted odds ratio: 3.18 [1.18-9.39] and 2.77 [1.10-7.46], respectively), the workers from self-sustained recycling facilities also have poor performances in circadian rhythm. Results also showed that the dismantlers/repairers working in entities not funded by the government had the highest risk of neurotoxic symptoms compared to the lowest-risk group (i.e., workers in government-funded companies with other job designations). Conclusion This timely and valuable study emphasizes the importance of improving the working conditions for high-risk e-waste workers, especially the dismantlers or repairers working in facilities not funded by the government.
Collapse
Affiliation(s)
- Gengze Liao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Feng Wang
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Shaoyou Lu
- School of Public Health (Shenzhen), Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
| | | | | | - Alan Hoi-shou Chan
- Department of Systems Engineering, City University of Hong Kong, Hong Kong SAR, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
- Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Hong Kong SAR, China
- The CUHK Centre for Public Health and Primary Care (Shenzhen) & Shenzhen Municipal Key Laboratory for Health Risk Analysis, Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, China
| |
Collapse
|
4
|
Yang S, Liao G, Tse LA. Association of preserved ratio impaired spirometry with mortality: a systematic review and meta-analysis. Eur Respir Rev 2023; 32:230135. [PMID: 37914194 PMCID: PMC10618908 DOI: 10.1183/16000617.0135-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 09/04/2023] [Indexed: 11/03/2023] Open
Abstract
BACKGROUND Preserved ratio impaired spirometry (PRISm) is prevalent within the general population. Increased mortality has been reported among subjects with PRISm, but the evidence has never been summarised. This systematic review aims to synthesise evidence on the association between PRISm and the risk of all-cause, cardiovascular and respiratory-related mortality. METHODS We systematically searched MEDLINE, Embase and Web of Science for population-based cohort studies from inception to April 2023 using the terms related to impaired spirometry and mortality. Titles and abstracts were screened to identify eligible studies that reported mortality estimates for individuals with PRISm. We excluded studies that adopted other definitions of impaired spirometry, had a specific study setting (e.g. HIV patients), had an insufficient follow-up period (<1 year) or reported duplicated data. Random-effects meta-analysis was used to produce pooled hazard ratio (HR) with 95% confidence intervals. Between-study heterogeneity was assessed with I2. RESULTS Eight studies met the inclusion criteria involving 40 699 individuals with PRISm. All included studies reported increased risk of all-cause mortality among adults with PRISm. Meta-analysis showed that PRISm was associated with an increased risk of all-cause mortality (pooled HR 1.71, 95% CI 1.51-1.93; I2=64%), cardiovascular mortality (pooled HR 1.57, 95% CI 1.44-1.72; I2=35%) and respiratory-related mortality (pooled HR 1.97, 95% CI 1.55-2.49; I2=0%). CONCLUSIONS Individuals with PRISm have a significantly increased risk of mortality compared with those with normal spirometry.
Collapse
Affiliation(s)
- Shuyuan Yang
- Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong SAR
| | - Gengze Liao
- Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong SAR
| | - Lap Ah Tse
- Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong SAR
| |
Collapse
|
5
|
Zeng T, Lu Y, Zhao Y, Guo Z, Sun S, Teng Z, Tian M, Wang J, Li S, Fan X, Wang W, Cai Y, Liao G, Liang X, He D, Wang K, Zhao S. Effectiveness of the booster dose of inactivated COVID-19 vaccine against Omicron BA.5 infection: a matched cohort study of adult close contacts. Respir Res 2023; 24:246. [PMID: 37828565 PMCID: PMC10571409 DOI: 10.1186/s12931-023-02542-y] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 09/16/2023] [Indexed: 10/14/2023] Open
Abstract
BACKGROUND Although COVID-19 vaccines and their booster regimens protect against symptomatic infections and severe outcomes, there is limited evidence about their protection against asymptomatic and symptomatic infections in real-world settings, particularly when considering that the majority of SARS-CoV-2 Omicron infections were asymptomatic. We aimed to assess the effectiveness of the booster dose of inactivated vaccines in mainland China, i.e., Sinopharm (BBIBP-CorV) and Sinovac (CoronaVac), against Omicron infection in an Omicron BA.5 seeded epidemic. METHODS Based on an infection-naive but highly vaccinated population in Urumqi, China, the study cohort comprised all 37,628 adults who had a contact history with individuals having SARS-CoV-2 infections, i.e., close contacts, between August 1 and September 7, 2022. To actively detect SARS-CoV-2 infections, RT-PCR tests were performed by local authorities on a daily basis for all close contacts, and a testing-positive status was considered a laboratory-confirmed outcome. The cohort of close contacts was matched at a ratio of 1:5 with the fully vaccinated (i.e., 2 doses) and booster vaccinated groups (i.e., 3 doses) according to sex, age strata, calendar date, and contact settings. Multivariate conditional logistic regression models were adopted to estimate the marginal effectiveness of the booster dose against Omicron BA.5 infection after adjusting for confounding variables. Subgroup analyses were performed to assess vaccine effectiveness (VE) in different strata of sex, age, the time lag from the last vaccine dose to exposure, and the vaccination status of the source case. Kaplan-Meier curves were employed to visualize the follow-up process and testing outcomes among different subgroups of the matched cohort. FINDINGS Before matching, 37,099 adult close contacts were eligible for cohort enrolment. After matching, the 2-dose and 3-dose groups included 3317 and 16,051 contacts, and the proportions with Omicron infections were 1.03% and 0.62% among contacts in the 2-dose and 3-dose groups, respectively. We estimated that the adjusted effectiveness of the inactivated booster vaccine versus 2 doses against Omicron infection was 35.5% (95% CI 2.0, 57.5). The booster dose provided a higher level of protection, with an effectiveness of 60.2% (95% CI 22.8, 79.5) for 15-180 days after vaccination, but this VE decreased to 35.0% (95% CI 2.8, 56.5) after 180 days. Evidence for the protection of the booster dose was detected among young adults aged 18-39 years, but was not detected for those aged 40 years or older. INTERPRETATION The receipt of the inactivated vaccine booster dose was associated with a significantly lower Omicron infection risk, and our findings confirmed the vaccine effectiveness (VE) of booster doses against Omicron BA.5 variants. Given the rapid evolution of SARS-CoV-2, we highlight the importance of continuously monitoring the protective performance of vaccines against the genetic variants of SARS-CoV-2, regardless of existing vaccine coverage.
Collapse
Affiliation(s)
- Ting Zeng
- School of Public Health, Xinjiang Medical University, Urumqi, 830017 China
| | - Yaoqin Lu
- School of Public Health, Xinjiang Medical University, Urumqi, 830017 China
- Urumqi Center for Disease Control and Prevention, Urumqi, 830026 China
| | - Yanji Zhao
- Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong, 999077 China
| | - Zihao Guo
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, 999077 China
| | - Shengzhi Sun
- School of Public Health, Capital Medical University, Beijing, 100069 China
| | - Zhidong Teng
- Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi, 830017 China
| | - Maozai Tian
- Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi, 830017 China
| | - Jun Wang
- Urumqi Center for Disease Control and Prevention, Urumqi, 830026 China
| | - Shulin Li
- Urumqi Center for Disease Control and Prevention, Urumqi, 830026 China
| | - Xucheng Fan
- Urumqi Center for Disease Control and Prevention, Urumqi, 830026 China
| | - Weiming Wang
- School of Mathematics and Statistics, Huaiyin Normal University, Huaian, 223300 China
| | - Yongli Cai
- School of Mathematics and Statistics, Huaiyin Normal University, Huaian, 223300 China
| | - Gengze Liao
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong, 999077 China
| | - Xiao Liang
- Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong, 999077 China
| | - Daihai He
- Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong, 999077 China
- Research Institute for Future Food, Hong Kong Polytechnic University, Hong Kong, 999077 China
| | - Kai Wang
- Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi, 830017 China
| | - Shi Zhao
- Centre for Health Systems and Policy Research, Chinese University of Hong Kong, Hong Kong, 999077 China
| |
Collapse
|
6
|
Lee PMY, Liao G, Tsang CYJ, Leung CC, Kwan MP, Tse LA. Sex differences in the associations of sleep-wake characteristics and rest-activity circadian rhythm with specific obesity types among Hong Kong community-dwelling older adults. Arch Gerontol Geriatr 2023; 113:105042. [PMID: 37120916 DOI: 10.1016/j.archger.2023.105042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 04/12/2023] [Accepted: 04/19/2023] [Indexed: 05/02/2023]
Abstract
BACKGROUND Sex differences exist in sleep characteristics, circadian rhythm and body composition but the evidence on their associations with obesity risk remains unclear. We aimed to examine sex differences in the associations of sleep-wake cycle and rest-activity circadian rhythm with specific obesity types among aged Chinese population. METHODS This report pooled data from 2 population-based surveys conducted during 4/2018-9/2018 and 7/2019-9/2020. All participants wore actigraphy on wrists for 7 days to measure their objective sleep patterns and rest-activity circadian rhythm. We measured participants' anthropometric data, and obtained their body weight, body fat percentage(fat%), visceral fat rating, muscle mass by calibrated bioelectrical impedance analysis device. Hand-grip strength was assessed by Jamar Hydraulic hand dynamometer. Multinomial logistic regression was performed to assess the odds ratio(OR) and 95% confidence intervals(95%CI). RESULTS We recruited 206 male and 134 female older adults with complete actigraphy data, with obesity prevalence of 36.9% and 31.3%, respectively. Male participants who had delayed sleep-wake cycle(i.e.,sleep-onset-time and wake-up time) was associated with higher risk of obesity(late sleep-onset-time:OR=5.28, 95%CI=2.00-13.94), and the results remained consistent for different types of obesity. Males with late M10(i.e., most active 10-hours) onset had higher adipose outcomes with an adjusted OR of 2.92(fat%:95%CI=1.10-7.71; visceral fat:95%CI=1.12-7.61). Among female participants, those with lower relative amplitude were associated with higher BMI and lower hand-grip strength. CONCLUSIONS This study revealed that circadian rhythm fragmentation was associated with obesity and muscle loss. Promoting good sleep quality and maintaining robust circadian rhythm and physical activity can prevent poor muscle strength among older adults.
Collapse
Affiliation(s)
- Priscilla Ming Yi Lee
- Department of Clinical Medicine-Department of Clinical Epidemiology, Aarhus University, Aarhus, Denmark; JC School of Public Health and Primary Care, the Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Gengze Liao
- JC School of Public Health and Primary Care, the Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Chun Yuk Jason Tsang
- Pneumoconiosis Mutual Aid Association, Hong Kong Special Administrative Region, China
| | - Chi Chiu Leung
- Stanley Ho Centre for Emerging Infectious Diseases, the Chinese University of Hong Kong, Hong Kong SAR, China
| | - Mei-Po Kwan
- Department of Geography and Resource Management, Wong Foo Yuan Building, The Chinese University of Hong Kong, Hong Kong SAR, China; Institute of Space and Earth Information Science, Fok Ying Tung Remote Sensing Science Building, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, the Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.
| |
Collapse
|
7
|
Li B, Liao G, Lee PMY, Huss A, Ma YTJ, Chan JWY, Wing YK, Tse LA. Association between matched chronotype and poor mental health among shift workers: a systematic review and meta-analysis. J Epidemiol Community Health 2023:jech-2022-220280. [PMID: 37258217 DOI: 10.1136/jech-2022-220280] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 01/02/2023] [Accepted: 05/16/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Nearly 0.7 billion workers are involved in the shift work system, leading to concerns about its potential impacts on the large-scale population mental health. This study aimed to synthesise evidence of the associations between matched chronotype and the risk of poor mental health among shift workers. METHODS Six computerised databases were searched from inception to September 2022. Observational studies were selected if they reported any association between common mental health parameters and chronotype scores/types of shift workers. The Preferred Reporting Items for Systematic Reviews and Meta-analyses checklist was followed. We extracted adjusted risk estimates to calculate pooled effect sizes and explore sources of heterogeneity. The study was registered in PROSPERO: CRD42022357437. RESULTS Fourteen studies including 49 909 workers were identified. Ever shift workers had a higher risk of poor mental health than the day workers (pooled OR 1.15, 95% CI 1.03 to 1.28; I2=14%, p=0.29), with the evening chronotype ever shift workers having a 1.47 times higher risk than those who worked during the day (pooled OR 1.47, 95% CI 1.13 to 1.91; I2=42%, p=0.16). Sensitivity analysis excluding studies with the highest risk of bias of each group demonstrated consistent findings. CONCLUSIONS Evening chronotype ever shift workers have poorer mental health than shift workers with other chronotypes. Chronotype remains unrecognised in the contemporary rostering system, making it a hidden contributor to occupational mental health. Work-related physical and mental stresses may be prevented/mitigated with further investigation on optimising shift work schedule combined with individual chronotype preference.
Collapse
Affiliation(s)
- Beixi Li
- JC School of Public Health and Primary Care, The Chinese University, Hong Kong SAR, People's Republic of China
| | - Gengze Liao
- JC School of Public Health and Primary Care, The Chinese University, Hong Kong SAR, People's Republic of China
| | - Priscilla Ming Yi Lee
- JC School of Public Health and Primary Care, The Chinese University, Hong Kong SAR, People's Republic of China
- Department of Clinical Medicine-Department of Clinical Epidemiology, Aarhus Universitet, Aarhus, Denmark
| | - Anke Huss
- Department of Population Health Sciences, Utrecht University, Utrecht, Netherlands
| | - Yuen Ting Julie Ma
- JC School of Public Health and Primary Care, The Chinese University, Hong Kong SAR, People's Republic of China
| | - Joey Wing-Yan Chan
- Department of Psychiatry, The Chinese University, Hong Kong SAR, People's Republic of China
| | - Yun Kwok Wing
- Department of Psychiatry, The Chinese University, Hong Kong SAR, People's Republic of China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University, Hong Kong SAR, People's Republic of China
- Shenzhen Municipal Key Laboratory for Health Risk Analysis, Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, People's Republic of China
| |
Collapse
|
8
|
Xu Y, Peng T, Zhou Q, Zhu J, Liao G, Zou F, Meng X. Evaluation of the oxidative toxicity induced by lead, manganese, and cadmium using genetically modified nrf2a-mutant zebrafish. Comp Biochem Physiol C Toxicol Pharmacol 2023; 266:109550. [PMID: 36717045 DOI: 10.1016/j.cbpc.2023.109550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 01/03/2023] [Accepted: 01/15/2023] [Indexed: 01/30/2023]
Abstract
Heavy metal pollution has become a serious environmental concern and a threat to public health. Three of the most common heavy metals are cadmium (Cd), lead (Pb), and manganese (Mn). Nuclear factor erythroid 2-related factor 2 (Nrf2) is an important transcription factor activated in the response to oxidative stress. In this study, mutant zebrafish with an nrf2a deletion of 7 bp were constructed by the CRISPR/Cas9 system to investigate the oxidative toxicity of these three heavy metals. The results of general toxicity tests showed that Pb exposure did not cause significant damage to mutant zebrafish compared with wild-type (WT) zebrafish. However, high Mn exposure increased mortality and malformation rates in mutant zebrafish. Of concern, Cd exposure caused significant toxic damage, including increased mortality and malformation rates, apoptosis of brain neurons, and severe locomotor behavior aberration in mutant zebrafish. The results of qRT-PCR indicated that Cd exposure could induce the activation of genes related to oxidative stress resistance in WT zebrafish, while the expression of these genes was inhibited in mutant zebrafish. This study showed that of the three heavy metals, Cd had the strongest oxidative toxicity, Mn had medium toxicity, and Pb had the weakest toxicity.
Collapse
Affiliation(s)
- Yongjie Xu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Tao Peng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Qin Zhou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Jiawei Zhu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Gengze Liao
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Fei Zou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| |
Collapse
|
9
|
Xu Y, Peng T, Xiang Y, Liao G, Zou F, Meng X. Neurotoxicity and gene expression alterations in zebrafish larvae in response to manganese exposure. Sci Total Environ 2022; 825:153778. [PMID: 35150691 DOI: 10.1016/j.scitotenv.2022.153778] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 02/03/2022] [Accepted: 02/06/2022] [Indexed: 06/14/2023]
Abstract
Manganese (Mn) is an essential trace element, but excessive exposure can damage mental, cognitive, and motor functions. Although many studies have reported the toxicity of Mn, the underlying mechanism remains unclear. Here, wild-type and/or Tg(NBT:DsRed) zebrafish embryos/larvae were exposed to different dosages of Mn to determine the effects on mortality, malformation, and hatching rates. A video tracking system was used to analyze the locomotor activities of zebrafish larvae. The terminal deoxynucleotidyl transferase dUTP nick end labeling assay and acridine orange staining were performed to monitor cell apoptosis, while dopamine transporter and tyrosine hydroxylase (TH) expression were detected by immunohistochemical staining. Meanwhile, transcriptome sequencing of the head tissues of zebrafish larvae was performed to search for molecular targets of Mn neurotoxicity. The results showed that Mn exposure increased the mortality and malformation rates of zebrafish larvae, and significantly reduced swim distance and velocity. In addition, the proportion of apoptotic dopaminergic neurons increased, while TH expression significantly decreased. The results of transcriptome sequencing showed that a large number of differentially expressed genes associated with apoptosis and DNA damage repair were upregulated, consistent with the above results. Meanwhile, Western blot analysis showed that higher exposure level of Mn could induce activation of MAPK pathway. These data demonstrate that Mn exposure can damage dopaminergic neurons and cause apoptosis, which has detrimental effects on the motor abilities of zebrafish larvae.
Collapse
Affiliation(s)
- Yongjie Xu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Tao Peng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Yang Xiang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Gengze Liao
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Fei Zou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| |
Collapse
|
10
|
Liao G, Huang B, Lee PM, Zhao S, Chan CK, Tai LB, Tsang CYJ, Leung CC, Kwan MP, Tse LA. Differences in Sleep Patterns and Mental Health Problems During Different Periods of COVID-19 Outbreak Among Community-Dwelling Older Men in Hong Kong. Int J Public Health 2022; 67:1604363. [PMID: 35431763 PMCID: PMC9011365 DOI: 10.3389/ijph.2022.1604363] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 02/24/2022] [Indexed: 11/13/2022] Open
Abstract
Objectives: To determine the association of sleep with mental health among Hong Kong community-dwelling older men in the context of the COVID-19 pandemic.Methods: This additional analysis was derived from the community-dwelling men aged >60 recruited during three COVID-19 outbreaks (i.e., pre-outbreak, between the second and third wave, and during the third wave) in Hong Kong from July 2019 to September 2020. Sleep and mental health were measured by Pittsburgh Sleep Quality Index questionnaire and Hospital Anxiety and Depression Scale, respectively. Multivariate logistic regression models were performed for the associations between sleep and mental health after considering the outbreaks’ impact.Results: Subjects enrolled between the second and third wave tended to have better sleep but worse mental health. Positive associations between poor sleep and depression (AOR = 3.27, 95% CI: 1.60–7.03) and anxiety (AOR = 2.40, 95% CI: 1.07–5.76) were observed. The period “between second and third wave” was positively associated with depression (AOR = 2.65, 95% CI: 1.22–5.83), showing an additive interaction with poor sleep.Conclusion: The positive association between poor sleep and depression was aggravated by the period “between the second and third wave” among community-dwelling older males in Hong Kong.
Collapse
Affiliation(s)
- Gengze Liao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Bixia Huang
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Priscilla Ming Lee
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Shi Zhao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Chi Kuen Chan
- Pneumoconiosis Clinic, Department of Health, Hong Kong, Hong Kong SAR, China
| | - Lai-Bun Tai
- Pneumoconiosis Clinic, Department of Health, Hong Kong, Hong Kong SAR, China
| | | | - Chi Chiu Leung
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Mei-Po Kwan
- Department of Geography and Resource Management, Wong Foo Yuan Building, The Chinese University of Hong Kong, Hong Kong SAR, China
- Institute of Space and Earth Information Science, Fok Ying Tung Remote Sensing Science Building, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
- *Correspondence: Lap Ah Tse,
| |
Collapse
|
11
|
Liu J, Xu Y, Liao G, Tu H, Huang Y, Peng T, Chen X, Huang Z, Zhang Y, Meng X, Zou F. The role of ambra1 in Pb-induced developmental neurotoxicity in zebrafish. Biochem Biophys Res Commun 2022; 594:139-145. [PMID: 35085890 DOI: 10.1016/j.bbrc.2021.12.084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 12/22/2021] [Indexed: 12/21/2022]
Abstract
Lead is a highly toxic metal that displays developmental neurotoxicity. Ambra1 plays a crucial role in embryonic neural development. At present, the role of Ambra1 in lead-induced developmental neurotoxicity remains unknown. In this study, we investigated the mechanism of Ambra1 concerning its role in lead-induced neurotoxicity. Zebrafish (Danio rerio) embryos were exposed to 0.1, 1, or 10 μM Pb until 5 days post-fertilization, and their locomotor activity was significantly impaired by the 10 μM treatment. Meanwhile, Pb reduced the expression of ambra1a and ambra1b in the brain at 48 and 72 h post-fertilization. Overexpression of ambra1a or ambra1b reversed Pb-induced alterations in locomotor activity, and decreased the apoptotic cell numbers in the brains of Pb-treated zebrafish. Our data reveal a novel protective role of Ambra1 against Pb-induced neural damage in the developing zebrafish.
Collapse
Affiliation(s)
- Jiaxian Liu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Yongjie Xu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Gengze Liao
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Hongwei Tu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Ying Huang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Tao Peng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiaohui Chen
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Zhibin Huang
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Yiyue Zhang
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| | - Fei Zou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| |
Collapse
|
12
|
Wu Y, Chen M, Huang M, Liao G, Tang S, Zheng H, Li Y, Peng B, Zheng X, Pan S, Hou J, Chen B. [Value of purple sign for predicting rebleeding events in cirrhotic patients following endoscopic selective varices devascularization]. Nan Fang Yi Ke Da Xue Xue Bao 2021; 41:1822-1827. [PMID: 35012914 PMCID: PMC8752418 DOI: 10.12122/j.issn.1673-4254.2021.12.10] [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: 01/24/2023]
Abstract
OBJECTIVE To assess the value of the purple sign for predicting long-term rebleeding events in cirrhotic patients following endoscopic selective varices devascularization. METHODS We retrospectively analyzed the clinical data of 97 patients with liver cirrhosis, who had a history of gastroesophageal variceal bleeding and underwent endoscopic selective varices devascularization. Thirty-two of the patients showed purple sign after endoscopic treatment. We used propensity score matching (PSM) to minimize the selection bias of the patients (purple sign vs no purple sign) and reduce the intergroup differences of clinical characteristics. The primary outcome measure of this study was cumulative rebleeding events after endoscopic selective varices devascularization. RESULTS The 1-year rebleeding rate (27.0% vs 36.7%) or 6-month rebleeding rate (10.9% vs 26.9%) following endoscopic treatment was not significantly different between the purple sign group and no purple sign group before PSM (P=0.2385). But after PSM, the 1-year rebleeding rate (28.2% vs 56.4%) and 6-month rebleeding rate (5.0% vs 37.0%) were significantly lower in the purple sign group than in the no purple sign group (P=0.0304). CONCLUSIONS The presence of purple sign indicates a lower risk of rebleeding after endoscopic treatment of cirrhotic gastroesophageal varices and a potentially favorable treatment response after endoscopic therapy, thus providing a clinical indicator for stratification of the patients for sequential endoscopic sessions.
Collapse
Affiliation(s)
- Y Wu
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - M Chen
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - M Huang
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - G Liao
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - S Tang
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - H Zheng
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - Y Li
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - B Peng
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - X Zheng
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - S Pan
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - J Hou
- Department of Gastroenterology and Hepatology of First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - B Chen
- Department of Gastroenterology and Hepatology of First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| |
Collapse
|
13
|
Czajka A, Liao G, Mykhaylyk OO, Armes SP. In situ small-angle X-ray scattering studies during the formation of polymer/silica nanocomposite particles in aqueous solution. Chem Sci 2021; 12:14288-14300. [PMID: 34760215 PMCID: PMC8565378 DOI: 10.1039/d1sc03353k] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 10/04/2021] [Indexed: 11/30/2022] Open
Abstract
This study is focused on the formation of polymer/silica nanocomposite particles prepared by the surfactant-free aqueous emulsion polymerization of 2,2,2-trifluoroethyl methacrylate (TFEMA) in the presence of 19 nm glycerol-functionalized aqueous silica nanoparticles using a cationic azo initiator at 60 °C. The TFEMA polymerization kinetics are monitored using 1H NMR spectroscopy, while postmortem TEM analysis confirms that the final nanocomposite particles possess a well-defined core-shell morphology. Time-resolved small-angle X-ray scattering (SAXS) is used in conjunction with a stirrable reaction cell to monitor the evolution of the nanocomposite particle diameter, mean silica shell thickness, mean number of silica nanoparticles within the shell, silica aggregation efficiency and packing density during the TFEMA polymerization. Nucleation occurs after 10-15 min and the nascent particles quickly become swollen with TFEMA monomer, which leads to a relatively fast rate of polymerization. Additional surface area is created as these initial particles grow and anionic silica nanoparticles adsorb at the particle surface to maintain a relatively high surface coverage and hence ensure colloidal stability. At high TFEMA conversion, a contiguous silica shell is formed and essentially no further adsorption of silica nanoparticles occurs. A population balance model is introduced into the SAXS model to account for the gradual incorporation of the silica nanoparticles within the nanocomposite particles. The final PTFEMA/silica nanocomposite particles are obtained at 96% TFEMA conversion after 140 min, have a volume-average diameter of 216 ± 9 nm and contain approximately 274 silica nanoparticles within their outer shells; a silica aggregation efficiency of 75% can be achieved for such formulations.
Collapse
Affiliation(s)
- A Czajka
- Department of Chemistry, University of Sheffield Dainton Building, Brook Hill Sheffield South Yorkshire S3 7HF UK
| | - G Liao
- Department of Chemistry, University of Sheffield Dainton Building, Brook Hill Sheffield South Yorkshire S3 7HF UK
| | - O O Mykhaylyk
- Department of Chemistry, University of Sheffield Dainton Building, Brook Hill Sheffield South Yorkshire S3 7HF UK
| | - S P Armes
- Department of Chemistry, University of Sheffield Dainton Building, Brook Hill Sheffield South Yorkshire S3 7HF UK
| |
Collapse
|
14
|
Liao G, Lee PMY, Zhao S, Ho WM, Lam AT, Lee MK, Poon PKM, Ng SSM, Li W, He Y, Wang F, Wong SYS, Ng CF, Tse LA. Joint effect between bisphenol A and alcohol consumption on benign prostatic hyperplasia: A case-control study in Hong Kong Chinese males. Prostate 2021; 81:1214-1224. [PMID: 34464465 DOI: 10.1002/pros.24217] [Citation(s) in RCA: 3] [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: 05/03/2021] [Revised: 08/08/2021] [Accepted: 08/13/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND Whether bisphenol A (BPA) exposure is a contributing factor to benign prostatic hyperplasia (BPH) remains unclear. This study evaluated the association between chronic BPA exposure and BPH risk, and explored whether this association was modified by alcohol drinking. METHODS This study included a total of 650 BPH cases and 650 controls recruited from the same hospital in Hong Kong during 2011-2016. Chronic BPA exposure level was estimated by a validated cumulative BPA exposure index (CBPAI). We performed unconditional logistic regression model to examine the association of BPH risk with potential sources of BPA exposure via oral intake and CBPAI. We further tested the interactions between CBPAI and alcohol consumption habits on BPH risk. RESULTS A positive exposure-response relationship was observed between CBPAI and BPH risk. Frequent BPA exposure via oral intake of foods heated in a plastic box/bag (odds ratio [OR] = 3.52, 95% confidence interval [CI]: 1.51-8.22), cooling water in a plastic bottle (OR = 2.65, 95% CI: 1.33-5.27), or using a plastic cup to contain hot water (OR = 4.14, 95% CI: 1.02-16.89), was significantly associated with increased BPH risk. Compared with nonalcohol drinkers, alcohol drinkers was insignificantly associated with BPH risk (OR = 1.10, 95% CI: 0.77-1.57), but it demonstrated a more remarkable positive gradient between CBPAI exposure and BPH risk among alcohol drinkers, indicating an additive interaction between CBPAI and alcohol on BPH risk (synergy index = 4.24, 95% CI: 1.21-14.94). CONCLUSIONS Chronic oral BPA exposure increased BPH risk with a positive exposure-response relationship among Hong Kong Chinese, and alcohol drinking amplified the effect of BPA on BPH. Hence, minimizations of containing food or water/beverage in plastic containers and drinking alcohol are recommended in the community to mitigate BPH risk. Future larger and designated studies are warranted.
Collapse
Affiliation(s)
- Gengze Liao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Priscilla M Y Lee
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Shi Zhao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
- CUHK Shenzhen Research Institute, Shenzhen, China
| | - Wing Ming Ho
- Department of Clinical Oncology, Prince of Wales Hospital, Hong Kong SAR, China
| | - Augustine T Lam
- Family Medicine Training Centre, Prince of Wales Hospital, Hong Kong SAR, China
| | - Man Kei Lee
- Family Medicine Training Centre, Prince of Wales Hospital, Hong Kong SAR, China
| | - Paul K M Poon
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Simon S M Ng
- Department of Surgery, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Wentao Li
- Department of Obstetrics and Gynecology, Monash University, Melbourne, Australia
| | - Yonghua He
- School of Public Health, Guilin Medical College, Guangxi Province, China
| | - Feng Wang
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Samuel Y S Wong
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Chi Fai Ng
- Department of Surgery, SH Ho Urology Centre, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China
- CUHK Shenzhen Research Institute, Shenzhen, China
| |
Collapse
|
15
|
Liao G, Wang P, Zhu J, Weng X, Lin S, Huang J, Xu Y, Zhou F, Zhang H, Tse LA, Zou F, Meng X. Joint toxicity of lead and cadmium on the behavior of zebrafish larvae: An antagonism. Aquat Toxicol 2021; 238:105912. [PMID: 34303158 DOI: 10.1016/j.aquatox.2021.105912] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 07/08/2021] [Accepted: 07/12/2021] [Indexed: 06/13/2023]
Abstract
Although the individual toxicity of lead (Pb) and cadmium (Cd) was intensively studied, little is known about their joint toxicity on the development of circadian behavioral rhythm. Therefore, we co-exposed zebrafish to Pb and Cd to investigate the alterations of behavioral rhythm and the potential mechanism. Inductively coupled plasma mass spectrometry analysis was used to detect the internal exposure level of heavy metals. The behavioral rhythm was monitored by a video-track tracking system. The changes of gene expression regarding melatonin-related molecules and clock genes were analyzed by quantitative polymerase chain reaction and JTK-Cycle analysis. The results showed that the level of Pb2+ and Cd2+ accumulated in the co-exposure group were significantly lower than that in the Pb or Cd group. Exposed to Pb reduced the locomotor activity; the behavioral rhythms were disrupted by Cd, while the pattern in the co-exposure group showed an antagonistic effect on locomotor activity and behavioral rhythm. The expression rhythm of aanat1 was disturbed and the expression levels of mtnr1aa and mtnr1bb were decreased by co-exposure treatment, but mtnr1c was increased in Pb and Cd group, respectively. Exposure to Cd caused the disruption of expression rhythm in clock genes, like clock1b, clock2, and cry1b, while only the rhythm of clock2 was disrupted in the co-exposure group. The results suggest that the behavioral rhythm disruption caused by Cd exposure is associated with the disturbance of certain circadian genes, whereas Pb exposure only abates the locomotor activity; an antagonistic effect on the behavioral pattern when co-exposed zebrafish larvae to Pb and Cd.
Collapse
Affiliation(s)
- Gengze Liao
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Peijun Wang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Jiawei Zhu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Xueqiong Weng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Shanshan Lin
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Jingwen Huang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Yongjie Xu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Fan Zhou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Hongnan Zhang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong SAR, China; CUHK Shenzhen Research Institute, Shenzhen, China
| | - Fei Zou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| |
Collapse
|
16
|
Lee PMY, Huang B, Liao G, Chan CK, Tai LB, Tsang CYJ, Leung CC, Kwan MP, Tse LA. Changes in physical activity and rest-activity circadian rhythm among Hong Kong community aged population before and during COVID-19. BMC Public Health 2021; 21:836. [PMID: 33933046 PMCID: PMC8087874 DOI: 10.1186/s12889-021-10890-x] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 04/19/2021] [Indexed: 01/21/2023] Open
Abstract
Background This study aims to determine the changes in physical activity and actigraphy-measured rest-activity circadian rhythm among Hong Kong community aged population before and during the outbreak of COVID-19. Methods This is a three repeated measure population-based cross-sectional study. We recruited community older men aged > 60 years in three periods of the COVID-19 outbreak in Hong Kong, i.e., before the COVID-19 outbreak (2 July 2019–8 January 2020), between the 2nd and 3rd waves of COVID-19 (23 June 2020–9 July 2020), and during the 3rd wave of COVID-19 (15 September 2020–29 September 2020). Participants reported detailed information on their physical activity habits using the International Physical Activity Questionnaire and wore actigraphs continuously for 7 days (168 h). The actigraph data were then transferred to four rest-activity circadian rhythm parameters: midline statistic of rhythm (MESOR), amplitude, acrophase and percent rhythm. Multivariate logistic regression was performed to estimate the association of period effect of COVID-19 on physical activity and rest-activity circadian rhythm parameters. Results Among the 242 community older men, 106 (43.8%) of them were recruited before the COVID-19 outbreak, 66 (27.3%) were recruited between the 2nd and 3rd waves of COVID-19, and 70 (28.9%) were recruited during the late phase of the 3rd wave of COVID-19. Compared with those recruited before COVID-19, participants recruited between the 2nd and 3rd waves of COVID-19 had lower physical activity (adjusted odds ratio (AOR) = 2.03, 95% confidence interval (95%CI) =1.05–3.93), MESOR (AOR = 2.05, 95%CI = 1.01–4.18), and amplitude (AOR = 1.91, 95%CI = 0.95–3.83). There was no difference in physical activity or circadian rhythm parameters between subjects recruited before and during the late phase of the 3rd wave. Conclusions This study found that the effect of COVID-19 on physical activity and rest-activity circadian rhythm for the community people may be short-term, indicating strong resilience of the community population. Although maintaining physical activity are encouraged for the older adults to sustain good health, a rebound in their physical activity may be a sign for the next wave of outbreak if insufficient social distancing and population protection are facilitated. Supplementary Information The online version contains supplementary material available at 10.1186/s12889-021-10890-x.
Collapse
Affiliation(s)
- Priscilla Ming Yi Lee
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
| | - Bixia Huang
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
| | - Gengze Liao
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
| | - Chi Kuen Chan
- Pneumoconiosis Clinic, Department of Health, Hong Kong, China
| | - Lai-Bun Tai
- Pneumoconiosis Clinic, Department of Health, Hong Kong, China
| | | | - Chi Chiu Leung
- Stanley Ho Centre for Emerging Infectious Diseases, the Chinese University of Hong Kong, Hong Kong, China
| | - Mei-Po Kwan
- Department of Geography and Resource Management and Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Lap Ah Tse
- JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China.
| |
Collapse
|
17
|
Ran J, Zhao S, Han L, Liao G, Wang K, Wang MH, He D. A re-analysis in exploring the association between temperature and COVID-19 transmissibility: an ecological study with 154 Chinese cities. Eur Respir J 2020; 56:13993003.01253-2020. [PMID: 32631839 PMCID: PMC7338403 DOI: 10.1183/13993003.01253-2020] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 06/17/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Jinjun Ran
- School of Public Health, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong Special Administrative Region, China.,J. Ran and S. Zhao contributed equally, and thus they are considered as joint-first authors
| | - Shi Zhao
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.,CUHK Shenzhen Research Institute, Shenzhen, China.,J. Ran and S. Zhao contributed equally, and thus they are considered as joint-first authors
| | - Lefei Han
- School of Nursing, Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China
| | - Gengze Liao
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Kai Wang
- Dept of Medical Engineering and Technology, Xinjiang Medical University, Urumqi, China
| | - Maggie H Wang
- JC School of Public Health and Primary Care, Chinese University of Hong Kong, Hong Kong Special Administrative Region, China.,CUHK Shenzhen Research Institute, Shenzhen, China
| | - Daihai He
- Dept of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China
| |
Collapse
|
18
|
Liu J, Liao G, Tu H, Huang Y, Peng T, Xu Y, Chen X, Huang Z, Zhang Y, Meng X, Zou F. A protective role of autophagy in Pb-induced developmental neurotoxicity in zebrafish. Chemosphere 2019; 235:1050-1058. [PMID: 31561294 DOI: 10.1016/j.chemosphere.2019.06.227] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 06/28/2019] [Accepted: 06/29/2019] [Indexed: 06/10/2023]
Abstract
Lead (Pb) is one of the most toxic heavy metals and has aroused widespread concern as it can cause severe impairments in the developing nervous system. Autophagy has been proposed as an injury factor in Pb-induced neurotoxicity. In this study, we used zebrafish embryo as a model, measured the general toxic effects of Pb, and investigated the effect of Pb exposure on autophagy, and its role in Pb-induced developmental neurotoxicity. Zebrafish embryos were exposed to Pb at concentrations of 0, 0.1, 1 or 10 μM until 4 days post-fertilization. Our data showed that exposure to 10 μM Pb significantly reduced survival rates and impaired locomotor activity. Uptake of Pb was enhanced as the concentration and duration of exposure increased. Inhibition of lysosomal degradation with bafilomycin A1 treatment abolished the suppression of Lc3-II protein expression by Pb. Furthermore, autophagosome formation was inhibited by Pb in the brain. In addition, mRNA expression of beclin1, one of the critical genes in autophagy, were decreased in Pb exposure groups at 72 h post-fertilization. Whole-mount in situ hybridization assay showed that beclin1 gene expression in the brain was reduced by Pb. Rapamycin, an autophagy inducer, partly resolved developmental neurotoxicity induced by Pb exposure. Our results suggest that autophagy plays a protective role in the developmental neurotoxicity of Pb in zebrafish embryos and larvae.
Collapse
Affiliation(s)
- Jiaxian Liu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Gengze Liao
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Hongwei Tu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Ying Huang
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Tao Peng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Yongjie Xu
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiaohui Chen
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Zhibin Huang
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Yiyue Zhang
- Key Laboratory of Zebrafish Modeling and Drug Screening for Human Diseases of Guangdong Higher Education Institutes, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xiaojing Meng
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| | - Fei Zou
- Department of Occupational Health and Occupational Medicine, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
| |
Collapse
|
19
|
Zheng S, Xia J, Zeng F, Huang L, Li F, Zhu H, Liao G, Lin Z, Zhou H. P021 The Impact of TP53 Mutation and Tumor Mutation Number on Outcomes in Patients with Stage I Non Small Cell Lung Cancer. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.10.045] [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: 11/29/2022]
|
20
|
Luo X, Liao G, Liu C, Jiang X, Lin M, Zhao C, Tao J, Huang Z. Characterization of bacteriophage HN48 and its protective effects in Nile tilapia Oreochromis niloticus against Streptococcus agalactiae infections. J Fish Dis 2018; 41:1477-1484. [PMID: 30117534 DOI: 10.1111/jfd.12838] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 05/07/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
Streptococcus agalactiae is a causative agent responsible for massive mortalities of tilapia that has led to catastrophic losses to tilapia culture globally. Bacteriophages represent a new class of antimicrobials against bacteria. In this study, we characterized the bacteriophage HN48, which formed small and round-transparent plaques on a double-layer plate. With a hexagonal head and a long tail, this phage may belong to the Caudovirales according to the International Committee on Taxonomy of Viruses. HN48 was found to have a relatively wide and highly specific host range, to be sensitive to high temperature (60-80°C) and low pH (3-5), and to be relatively stable at alkaline pH (8-10). Intraperitoneal injection with HN48 had no adverse effects on tilapia and effectively inactivated the bacteria in the kidney. Fish that received phage therapy had 60% ± 3.3% survival rates and a delayed mean death time of about 3 days when compared to the control group. To the best of knowledge, this is the first study of tilapia streptococcal phage. Overall, the results indicated that phage HN48 could prevent tilapia from experimental S. agalactiae infection, suggesting it has the potential to control this disease.
Collapse
Affiliation(s)
- X Luo
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - G Liao
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - C Liu
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - X Jiang
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - M Lin
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - C Zhao
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - J Tao
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| | - Z Huang
- Key Laboratory of Aquatic Animal Immune Technology, Key Laboratory of Fishery Drug Development, Pearl River Fishery Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture, Guangzhou, China
| |
Collapse
|
21
|
Scott GG, Carroll DC, Astbury S, Clarke RJ, Hernandez-Gomez C, King M, Alejo A, Arteaga IY, Dance RJ, Higginson A, Hook S, Liao G, Liu H, Mirfayzi SR, Rusby DR, Selwood MP, Spindloe C, Tolley MK, Wagner F, Zemaityte E, Borghesi M, Kar S, Li Y, Roth M, McKenna P, Neely D. Dual Ion Species Plasma Expansion from Isotopically Layered Cryogenic Targets. Phys Rev Lett 2018; 120:204801. [PMID: 29864368 DOI: 10.1103/physrevlett.120.204801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 02/19/2018] [Indexed: 06/08/2023]
Abstract
A dual ion species plasma expansion scheme from a novel target structure is introduced, in which a nanometer-thick layer of pure deuterium exists as a buffer species at the target-vacuum interface of a hydrogen plasma. Modeling shows that by controlling the deuterium layer thickness, a composite H^{+}/D^{+} ion beam can be produced by target normal sheath acceleration (TNSA), with an adjustable ratio of ion densities, as high energy proton acceleration is suppressed by the acceleration of a spectrally peaked deuteron beam. Particle in cell modeling shows that a (4.3±0.7) MeV per nucleon deuteron beam is accelerated, in a directional cone of half angle 9°. Experimentally, this was investigated using state of the art cryogenic targetry and a spectrally peaked deuteron beam of (3.4±0.7) MeV per nucleon was measured in a cone of half angle 7°-9°, while maintaining a significant TNSA proton component.
Collapse
Affiliation(s)
- G G Scott
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - D C Carroll
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - S Astbury
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - R J Clarke
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - C Hernandez-Gomez
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - M King
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - A Alejo
- Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - I Y Arteaga
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - R J Dance
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - A Higginson
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - S Hook
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - G Liao
- Key Laboratory for Laser Plasmas (MoE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - H Liu
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - S R Mirfayzi
- Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - D R Rusby
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - M P Selwood
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - C Spindloe
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - M K Tolley
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - F Wagner
- PHELIX group, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - E Zemaityte
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - M Borghesi
- Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - S Kar
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
- Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom
| | - Y Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - M Roth
- Fachbereich Physik, Technische Universität Darmstadt, Darmstadt 64289, Germany
| | - P McKenna
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - D Neely
- Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
- Department of Physics SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| |
Collapse
|
22
|
Huang X, Ma T, Tian J, Shen L, Zuo H, Hu C, Liao G. wblA, a pleiotropic regulatory gene modulating morphogenesis and daptomycin production in Streptomyces roseosporus. J Appl Microbiol 2018. [PMID: 28621039 DOI: 10.1111/jam.13512] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AIMS The wblA gene, encoding a homologue of the WhiB family protein, was identified in the sequenced genome of daptomycin producer Streptomyces roseosporus. To explore the function of wblA, we construct wblA disruption strains, complemented strains and overexpression strains to test whether it can affect the production of secondary metabolites and morphogenesis. METHODS AND RESULTS We constructed disruption strains by homologous recombination in S. roseosporus. The disruption mutant of wblA could block aerial mycelium sporulation and enhance the production of daptomycin by 51%. In contrast, overexpression of wblA resulted in significantly decreased the yield of daptomycin. In agreement with it, the transcription of key daptomycin regulatory genes atrA, dptR2 and dptR3 and structural gene dptE remarkably increased in the wblA disruption mutant. CONCLUSIONS wblA plays a key role in control of daptomycin biosynthesis and is essential for sporulation. The disruption of wblA could accumulate the transcription level of some key genes involving in daptomycin biosynthesis. SIGNIFICANCE AND IMPACT OF THE STUDY Daptomycin is an important antibiotic with potent activity against a variety of Gram-positive pathogens. This study demonstrates that valuable improvement in the yield of daptomycin can be achieved through modulating the expression of wblA transcription regulator.
Collapse
Affiliation(s)
- X Huang
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - T Ma
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - J Tian
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - L Shen
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - H Zuo
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - C Hu
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - G Liao
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| |
Collapse
|
23
|
Yao H, He C, Deng L, Liao G. Enteral versus parenteral nutrition in critically ill patients with severe pancreatitis: a meta-analysis. Eur J Clin Nutr 2017; 72:66-68. [PMID: 28901335 DOI: 10.1038/ejcn.2017.139] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Revised: 06/19/2017] [Accepted: 07/27/2017] [Indexed: 01/13/2023]
Abstract
Whether enteral nutrition (EN) is superior to parenteral nutrition (PN) in critically ill patients with severe acute pancreatitis remains unknown. The objective of this meta-analysis was to assess the effects of EN versus PN on clinical outcomes in a subgroup of pancreatitis patients. Relevant randomized controlled trials (RCTs) were searched in Scopus, PubMed and Web of Science from inception to August 2016. Ultimately, five RCTs including 348 patients were enrolled in this analysis. Compared with PN, EN was associated with a significant reduction in overall mortality (risk ratio (RR)=0.36, 95% confidence interval (CI) 0.20-0.65, P=0.001) and the rate of multiple organ failure (RR=0.39, 95% CI 0.21-0.73, P=0.003). EN should be recommended as the preferred route of nutrition for critically ill patients with severe acute pancreatitis.
Collapse
Affiliation(s)
- H Yao
- Department of Intensive Care Unit of the Affiliated Nanhua Hospital, University of South China, Hengyang, China
| | - C He
- Department of Intensive Care Unit of the Affiliated Nanhua Hospital, University of South China, Hengyang, China
| | - L Deng
- Department of Intensive Care Unit of the Affiliated Nanhua Hospital, University of South China, Hengyang, China
| | - G Liao
- Department of Intensive Care Unit of the Affiliated Nanhua Hospital, University of South China, Hengyang, China
| |
Collapse
|
24
|
Liao G, Liang Y, Zheng G, Zhang S, Lao X, Li S. Evaluation and management of skull base tumours. Int J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.ijom.2017.02.119] [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: 11/30/2022]
|
25
|
Liu K, He Q, Liao G, Kong G, Wang C. Influence of pelvic postural angle change on acetabulum implantation in total hip arthroplasty. Acta Orthop Belg 2016; 82:549-556. [PMID: 29119896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The current study investigated the relationship between the implantation angle of the acetabular component and the change in the pelvic postural angle during hip arthroplasty surgery. One pelvis with a left lower limb prosthesis was used. Total hip arthroplasty on the left pelvis was simulated with the help of a computer-assisted navigation system. The pelvis revolved around the horizontal, longitudinal and sagittal axes at different angles, and the anteversion and abduction of the acetabular component were measured. The changing angle of the pelvis rotating around the horizontal and longitudinal axes greatly influenced acetabular component anteversion. The changing angle of the pelvis rotating around the sagittal axis had a relatively great influence on the acetabular component abduction angle. The change in the postural angle of the pelvis had a great influence on the installation angle of the acetabular component. It is important to standardize posture prior to the operation.
Collapse
|
26
|
Liao G, Su Y, Zheng G, Zhang S. Surgical approaches to anterior and middle skull base. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.666] [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: 10/22/2022]
|
27
|
Mazengia E, Samadpour M, Hill HW, Greeson K, Tenney K, Liao G, Huang X, Meschke JS. Prevalence, concentrations, and antibiotic sensitivities of Salmonella serovars in poultry from retail establishments in Seattle, Washington. J Food Prot 2014; 77:885-93. [PMID: 24853509 DOI: 10.4315/0362-028x.jfp-13-394] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Poultry have been identified as one of the major sources of salmonellosis, with estimates ranging from 10 to 22% of total cases. Despite several advances in the industry and new performance standards, the incidence of salmonellosis in the population has not declined over the last 15 years. Salmonella is pervasive in a wide variety of foods, and thus, estimating its burden resulting from specific food categories has been challenging and plagued with uncertainty due to critical data gaps. The objective of this study was to conduct a year-long market survey (1,322 samples) to help bridge the data gaps on the contamination rates and levels of Salmonella on raw poultry by product type (i.e., breast, thighs, drums, wings, and split breast) and production method (conventional versus organic). The isolates recovered were serotyped and tested for antibiotic sensitivities. A PCR method was utilized for initial screening of samples after an overnight enrichment in tryptic soy broth. Three-tube most-probable-number (MPN) assays and anti-Salmonella immunomagnetic separation methods were utilized to determine the levels of Salmonella and aid with the recovery of Salmonella species, respectively. Eleven percent of the samples were positive for Salmonella. Significant differences in percent positive rates by product type included up to a 4-fold difference in percent positive rates between establishments, ranging from 7 to 31%. Of the samples positive for Salmonella species, 94% had <30 MPN/100 g. Production methods identified as organic or as not using antibiotics had significantly higher rates of recovery of Salmonella. On the other hand, all of the Salmonella isolates that were resistant to two or more antibiotics originated from conventional processing establishments where antibiotics were utilized. In addition, a significant proportion of isolates from conventionally processed products were serotypes clinically relevant to humans.
Collapse
Affiliation(s)
- E Mazengia
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, USA
| | - M Samadpour
- Institute for Environmental Health, 15300 Bothell Way N.E., Lake Forest Park, Washington 98155, USA
| | - H W Hill
- Institute for Environmental Health, 15300 Bothell Way N.E., Lake Forest Park, Washington 98155, USA
| | - K Greeson
- Institute for Environmental Health, 15300 Bothell Way N.E., Lake Forest Park, Washington 98155, USA
| | - K Tenney
- Institute for Environmental Health, 15300 Bothell Way N.E., Lake Forest Park, Washington 98155, USA
| | - G Liao
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, USA
| | - X Huang
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, USA
| | - J S Meschke
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, USA.
| |
Collapse
|
28
|
Xia H, Jiang X, Jiang C, Liao G. Two new carboxylate-bridged one-dimensional coordination polymers based on macrocyclic metallic tectons. RUSS J COORD CHEM+ 2014. [DOI: 10.1134/s1070328414020110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
29
|
Liao G, Hartmaier RJ, Luthra S, Chandran U, McGuire KP, Puhalla SL, Lee AV, Tseng GC, Oesterreich S. Abstract P4-05-03: Unique genetic, epigenetic, and transcriptomic changes in premenopausal breast cancer suggest novel strategies for therapy. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p4-05-03] [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: 11/16/2022]
Abstract
Abstract
Breast cancer in premenopausal women (preM) is frequently associated with worse prognosis compared to that in postmenopausal women (postM) even when controlling for prognostic variables. In particular, preM ER+ tumors have a poor prognosis on endocrine therapy. There is, however, a paucity of studies characterizing molecular alterations in premenopausal tumors, a potential avenue for finding personalized therapies for this group of women.
We analyzed gene expression, CNV, methylation, and somatic mutations in tumors from preM (≤45; ER+ n = 110, and ER- n = 39) and postM (≥55, ER+ n = 392, and ER- n = 102) women in The Cancer Genome Atlas (TCGA). Unbiased hierarchical clustering of 2,900 most variably expressed genes (using both RNA-seq and Agilent expression array data) in the whole dataset (n = 643) identified four major subtypes which correlated highly with the PAM50 defined subtypes LumA, LumB, Basal and HER2; however, there wasn't any separation between preM and postM samples. Similarly, principal component analysis using 10,000 genes with the highest inter-quartile range (IQR) demonstrated high similarity across preM and postM samples. Direct examination of gene expression differences between PreM and PostM ER+ tumors using unpaired t-test (5% FDR) identified 3,044 differentially expressed genes. The genes most upregulated in premenopausal tumors included AREG, TFPI2, MSMB, TCN1, and GLRA3. Ingenuity Pathway Analysis revealed a highly significant enrichment for TGFb (p<1.9E-16) pathway activity in preM tumors. Intriguingly, no significant gene expression differences between preM and postM ER- tumors were identified. We thus then focused on genetic and epigenetic alterations that may underlie these transcriptomic changes in ER+ preM tumors.
Comparison of methylation (450K Illumina array) between preM and postM ER+ tumors showed a difference in 1% (n = 1,738) of the probes. Genes with the largest difference included ESR1, SIM2, and KLF6. Significant differences in DNA copy number variation (Affymetrix SNP 6.0 array) were also identified in ER+ preM tumors. A number of somatic mutations were significantly enriched in preM ER+ tumors including DSPP and GATA3. Integrated analysis also showed that approximately half of the observed differences in gene expression are driven by CNVs.
Conclusion: Our in silico study has identified a number of genes and pathways which are significantly altered between preM and postM ER+ breast cancer. Distinct genetic and epigenetic differences suggest unique etiology for some preM tumors. Currently ongoing Paradigm analysis, and confirmatory studies using METABRIC data are expected to further identify pathways that could specifically be targeted in premenopausal breast cancer.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P4-05-03.
Collapse
Affiliation(s)
- G Liao
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - RJ Hartmaier
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - S Luthra
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - U Chandran
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - KP McGuire
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - SL Puhalla
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - AV Lee
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - GC Tseng
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| | - S Oesterreich
- University of Pittsburgh, Pittsburgh, PA; University of Pittsburgh Cancer Institute, Magee Womens Research Institute, Pittsburgh, PA; University of Pittsburgh Cancer Institute, UPMC Cancer Center, Pittsburgh, PA
| |
Collapse
|
30
|
Xia H, Jiang X, Lin L, Jiang C, Liao G. Synthesis, crystal structures, and properties of inorganic-organic hybrid complexes constructed from copper(II) macrocyclic fragment. RUSS J COORD CHEM+ 2013. [DOI: 10.1134/s1070328413120099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
31
|
Liao G, Wang Y, Zhou YQ, Li TW, Zeng DQ, Zeng X, Li J, Dan HX, Chen QM. Host genetic susceptibility to oral cancer: evidence from meta-analyses and pooled analyses. Oral Dis 2013; 20:644-9. [PMID: 24102947 DOI: 10.1111/odi.12184] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 07/16/2013] [Accepted: 09/12/2013] [Indexed: 12/13/2022]
Affiliation(s)
- G Liao
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - Y Wang
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - Y-Q Zhou
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - T-W Li
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - D-Q Zeng
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - X Zeng
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - J Li
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - H-X Dan
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| | - Q-M Chen
- State Key Laboratory of Oral Diseases; West China School of Stomatology; Sichuan University; Chengdu China
| |
Collapse
|
32
|
Lewis RE, Albert NP, Liao G, Wang W, Prince RA, Kontoyiannis DP. High-dose induction liposomal amphotericin B followed by de-escalation is effective in experimental Aspergillus terreus pneumonia. J Antimicrob Chemother 2013; 68:1148-51. [DOI: 10.1093/jac/dks521] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
|
33
|
Wang L, Zhao Y, Liu Q, Huang Y, Hu C, Liao G. Improvement of A21978C production in Streptomyces roseosporus by reporter-guided rpsL mutation selection. J Appl Microbiol 2012; 112:1095-101. [PMID: 22486967 DOI: 10.1111/j.1365-2672.2012.05302.x] [Citation(s) in RCA: 27] [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] [Indexed: 11/27/2022]
Abstract
AIMS Daptomycin, one of the A21978C factors produced by Streptomyces roseosporus, is an acidic cyclic lipopeptide antibiotic with potent activity against a variety of Gram-positive pathogens. To increase the titre of this extensively used and clinically important antibiotic, we applied a reported-guided rpsL mutation selection system to generate strains producing high levels of A21978C. METHODS AND RESULTS In the reporter design, dptE was chosen as the overexpressing target, and neo-encoding neomycin phosphotransferase as the reporter. Using this reporter-guided selection system, 20% of the selected, streptomycin-resistant mutants produced greater amounts of A21978C than the starting strain. The selection system increased the screening efficiency about 10-fold with a frequency of 1·7% A21978C overproducing strains among str(r) mutants. A21978C production was increased approximately 2·2-fold in the rpsL K43N mutant. CONCLUSIONS The combination of ribosome engineering and reporter-guided mutant selection generated an A21978C overproducing strain that produced about twice as much A21978C as the parental strain. SIGNIFICANCE AND IMPACT OF THE STUDY The strategies presented here, which integrated the advantages of both ribosome engineering and reporter-guided mutation selection, could be applied to other bacteria to improve their yield of secondary metabolites.
Collapse
Affiliation(s)
- L Wang
- Institute of Modern Biopharmaceuticals, School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | | | | | | | | | | |
Collapse
|
34
|
Zhang X, Liu HH, Weller P, Zheng M, Tao W, Wang J, Liao G, Monshouwer M, Peltz G. In silico and in vitro pharmacogenetics: aldehyde oxidase rapidly metabolizes a p38 kinase inhibitor. Pharmacogenomics J 2010; 11:15-24. [DOI: 10.1038/tpj.2010.8] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
35
|
|
36
|
Zou Y, Liao G, Liu Y, Wang Y, Yang Z, Lin Y, Shen Y, Li S, Xiao J, Guo H, Wan C, Wang Z. Association of the 54-nucleotide repeat polymorphism of hPer3 with heroin dependence in Han Chinese population. Genes Brain Behav 2007; 7:26-30. [PMID: 17451453 DOI: 10.1111/j.1601-183x.2007.00314.x] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Circadian clock genes have the function of producing circadian rhythm. They are also implicated in the origin or development of many diseases such as cancers and neuropsychiatric diseases. The purpose of this study is to determine whether the 54-nucleotide repeat polymorphism of hPer3, one of the circadian clock genes, associates with heroin dependence. DNA samples were obtained from 209 Chinese heroin-dependent subjects and 249 Chinese healthy controls. The 54-nucleotide repeat polymorphism was detected by polymerase chain reaction and DNA agarose gel electrophoresis. The frequency of four-repeat allele was significantly higher (chi(2)= 10.64, P = 0.001; corrected for multiple tests, P = 0.003) in the mixed gender heroin-dependent subject group (four repeat: 0.89, five repeat: 0.11) than in the mixed gender control group (four repeat: 0.81, five repeat: 0.19); the frequency of four-repeat allele was also significantly higher (chi(2)= 10.00, P = 0.002; corrected for multiple tests, P = 0.006) in the male heroin-dependent subject group (four repeat: 0.89, five repeat: 0.11) than in the male control group (four repeat: 0.81, five repeat: 0.19); for females, no significant trend was observed with the 54-nucleotide repeat polymorphism between the heroin-dependent subject group and the control group. Our results suggest that the 54-nucleotide repeat polymorphism of hPer3 significantly associates with heroin dependence at the allele frequency level and may be a potential risk factor for the development of heroin dependence.
Collapse
Affiliation(s)
- Y Zou
- Health Ministry Key Lab of Chronobiology, West China Medical Center, Sichuan University, Sichuan, China
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Jákli A, Liao G, Shashikala I, Hiremath US, Yelamaggad CV. Chirality and polarity transfers between bent-core smectic liquid-crystal substances. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 74:041706. [PMID: 17155077 DOI: 10.1103/physreve.74.041706] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2006] [Indexed: 05/12/2023]
Abstract
Liquid-crystal phases with both solid and liquid characteristics are unique, since they exhibit chirality on both molecular and mesoscopic levels under special circumstances. We have studied binary composites formed by mixing of a chiral dimer (B-Ch), in which a bent core is covalently linked to a promesogenic cholesterol unit through a flexible spacer, and an achiral bent-core mesogen having two vicinal fluorine atoms (B-2F). The pure materials show smectic phases featuring C2 symmetry. The dimer B-Ch displays conventional chiral smectic C (SmC*) phase with a chirality--induced polarization P(c) approximately 30 nC/cm2, whereas B-2F possesses synclinic and anticlinic antiferroelectric "banana" smectic (SmCP) phase with a relatively high-polarization (P(b)) value of about 900 nC/cm(2). Mixing these two materials we were able to measure P(c), and we have verified that the molecular chirality contributes to the polarization of banana phases only in synclinic configurations.
Collapse
Affiliation(s)
- A Jákli
- Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA
| | | | | | | | | |
Collapse
|
38
|
Liao G, Shashikala I, Yelamaggad CV, Rao DSS, Prasad SK, Jákli AJ. Ferroelectricity of a bent-core material with cholesteryl terminal chain. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 73:051701. [PMID: 16802948 DOI: 10.1103/physreve.73.051701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2006] [Indexed: 05/10/2023]
Abstract
We have studied the phase sequence and physical properties of an asymmetric bent-core material with a chiral rigid cholesteryl moiety, and a flexible achiral alkyl side chain at the other end. The combination of the achiral bent core with the chiral cholesteryl unit results in properties different from those of both the usual calamitic and bent-core materials. We find that the presence of the bent core unit induces a wide-temperature-range optically isotropic (probably BPIII) mesophase between the isotropic and cholesteric (chiral nematic) phases. Below the cholesteric phase a ferroelectric smectic-C* structure occurs in which the bent-core units do not seem to form a polar close packing.
Collapse
Affiliation(s)
- G Liao
- Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA
| | | | | | | | | | | |
Collapse
|
39
|
Jia P, Wu S, Li F, Xu Q, Wu M, Chen G, Liao G, Wang S, Zhou J, Lu Y, Ma D. Breast cancer resistance protein-mediated topotecan resistance in ovarian cancer cells. Int J Gynecol Cancer 2006; 15:1042-8. [PMID: 16343180 DOI: 10.1111/j.1525-1438.2005.00260.x] [Citation(s) in RCA: 15] [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: 11/28/2022] Open
Abstract
Overexpression of breast cancer resistance protein (BCRP) and mitoxantrone (MX) resistance protein can confer resistance to a variety of cytostatic drugs, such as MX, topotecan (TPT), doxorubicin, and daunorubicin. This study investigates the role of BCRP in resistance of ovarian cancer to TPT treatment. We have developed TPT-resistant human ovarian cancer cell line. Intracellular concentration of fluorescent dye rhodamine 123 (Rh123) was measured by flow cytometry. The expression of several membrane transporter proteins including P-glycoprotein (P-gp), multidrug resistance protein 1 (MRP1), and BCRP were determined by reverse transcription-polymerase chain reaction and Western blotting. The Rh123 concentration in parental cells was approximately three times of those in TPT-resistant cells. In contrast to undetectable level of P-gp messenger RNA (mRNA) and minimal level of MRP1 expression in TPT-resistant cells, overexpression of both the BCRP mRNA and the protein was detected in these cells. Introduction of antisense-phosphorothioate oligonucleotide derived from BCRP mRNA into TPT-resistant cells resulted in a significant increase in the concentration of intracellular Rh123. These results suggested a novel mechanism in which a reduced intracellular drug concentration may be mediated by BCRP gene products in human ovarian cancer cells.
Collapse
Affiliation(s)
- P Jia
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, People's Republic of China
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Liu G, Amin S, Okuhama NN, Liao G, Mingle LA. A quantitative evaluation of peroxidase inhibitors for tyramide signal amplification mediated cytochemistry and histochemistry. Histochem Cell Biol 2006; 126:283-91. [PMID: 16508759 PMCID: PMC1713225 DOI: 10.1007/s00418-006-0161-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [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] [Accepted: 02/03/2006] [Indexed: 10/25/2022]
Abstract
Many peroxidase inhibitors have been used in horseradish peroxidase (HRP) mediated immunostaining and in situ hybridization to quench background peroxidase activity. However, the efficacy of these inhibitors has been controversial, partially due to the lack of a quantitative study. Tyramide signal amplification (TSA) is much more sensitive than other HRP-mediated methods but its super-sensitivity also demands effective inhibition of background peroxidase activity. In searching for an effective peroxidase inhibitor, we have systematically evaluated the efficacy of several peroxidase inhibitors by quantifying the fluorescence intensity in cultured fibroblasts and tissue sections treated with the inhibitors. For cultured cells, 0.05 mM of phenylhydrazine and 1 unit/ml of glucose oxidase gave only moderate inhibition of HRP activity while 1 mM of sodium azide (NaN(3)), 3% of hydrogen peroxide (H(2)O(2)), NaN(3)/H(2)O(2) combined and 0.02 N hydrochloric acid (HCl) provided more complete inhibition. However, the inhibitory effect of NaN(3)/H(2)O(2) is reversible upon removal of the inhibitors and followed by incubation and wash to mimic antibody interactions. Similar results were obtained from rat skin wound tissues that have strong endogenous peroxidase activity. Our results recommend the use of HCl and caution the use of phenylhydrazine, glucose oxidase, NaN(3) and H(2)O(2) as potent peroxidase inhibitors.
Collapse
Affiliation(s)
- G Liu
- Center for Cell Biology and Cancer Research, Albany Medical College, 47 New Scotland Avenue MC-165, Albany, NY 12208, USA.
| | | | | | | | | |
Collapse
|
41
|
Liao G, Smalyukh II, Kelly JR, Lavrentovich OD, Jákli A. Electrorotation of colloidal particles in liquid crystals. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 72:031704. [PMID: 16241457 DOI: 10.1103/physreve.72.031704] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2005] [Indexed: 05/05/2023]
Abstract
We present the first observations of dc electric-field-induced rotational motion of finite particles in liquid crystals. We show that the electrorotation is essentially identical to the well-known Quincke rotation, which in liquid crystals triggers an additional translational motion at higher fields. In the smectic phase the translational motion is confined to the two-dimensional geometry of smectic layers, in contrast to the isotropic and nematic phases, where the particles can move in all three dimensions. We demonstrate that by a proper analysis of the electrorotation, one can determine the in-plane viscosity of smectic liquid crystals. This method needs only a small amount of material, does not require uniform alignment over large areas, and enables probing rheological properties locally.
Collapse
Affiliation(s)
- G Liao
- Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA
| | | | | | | | | |
Collapse
|
42
|
Liao G, Stojadinovic S, Pelzl G, Weissflog W, Sprunt S, Jákli A. Optically isotropic liquid-crystal phase of bent-core molecules with polar nanostructure. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 72:021710. [PMID: 16196588 DOI: 10.1103/physreve.72.021710] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2004] [Revised: 06/13/2005] [Indexed: 05/04/2023]
Abstract
We found that the optically isotropic (I(M)) mesophase observed recently below the nematic phase of the bent-core liquid crystal 4-chlororesorcinol bis[4-(4-n-dodecyloxybenzoyloxy)benzoate] shows ferroelectric-type switching. Polarizing microscopic, electric current, dielectric, and dynamic light scattering studies lead us to propose that the I(M) phase is composed of interconnected orthoconic racemic smectic (Sm-Ca P(F)) nanodomains with random layer orientations. Near the nematic phase, where the polarization can be saturated by electric fields, the system responds in a fashion analogous to the granular structure of a magnetic spin glass--in particular, we observed that the relaxation back to the nonpoled structure follows a similar, inverse logarithmic rule.
Collapse
Affiliation(s)
- G Liao
- Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA
| | | | | | | | | | | |
Collapse
|
43
|
Jákli A, Prasad V, Shankar Rao DS, Liao G, Jánossy I. Light-induced changes of optical and electrical properties in bent-core azo compounds. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 71:021709. [PMID: 15783342 DOI: 10.1103/physreve.71.021709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2004] [Indexed: 05/24/2023]
Abstract
We have studied the optical and electrical properties of two bent-core substances with an azo linkage in their cores. Pump-probe laser studies, direct textural observations, and spectrophotometric recordings show an initial decrease of light transmission, which at larger light intensities (approximately 1 mW/mm2) is followed by a bleaching. Simultaneously the electrical properties (electric conductivity, antiferroelectric polarization, switching threshold, and switching time) decreased monotonically with increasing light intensities. The monotonic decrease of electrical properties indicates that the darkening and bleaching have the same origin, namely, the photochemical isomerization of the azo linkage from the trans to the cis isomer. The material with cis isomer has a lower clearing point and phase separates from the trans-rich domains. Initially the size of the separated isotropic domains is below the visible range, which causes increased scattering. As the size of the isotropic domains increase the scattering disappears and the transmittance becomes the average of the transmittances in the polar tilted smectic and isotropic phases.
Collapse
Affiliation(s)
- A Jákli
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA
| | | | | | | | | |
Collapse
|
44
|
Liao G. [Preliminary research on Sino-foreign medical exchanges in the Yuan dynasty] (Chi). Zhonghua Yi Shi Za Zhi 2001; 18:211-6. [PMID: 11621923] [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: 02/21/2023]
|
45
|
Abstract
The Epstein-Barr virus (EBV) Mta protein is a posttranscriptional regulator of EBV lytic gene expression that affects RNA splicing and transport. Mta mediates cytoplasmic accumulation of unspliced EBV replication gene transcripts and shuttles between the nucleus and cytoplasm. Mta contains a recognized leucine-rich, putative nuclear export signal (NES) between aa 227 and 236. Deletion of this signal sequence eliminated shuttling, while mutation of the core LXL motif in the putative NES diminished but did not abolish the ability of Mta to shuttle from donor to recipient cells in a heterokaryon assay. A double mutation of the LXL motif plus an upstream VTL motif eliminated shuttling, suggesting that Mta may have two NES motifs. In confirmation of this, transfer of either the sequence encoding the leucine-rich aa 227-236 motif or that encoding the adjacent hydrophobic aa 218-227 sequence to a GFP-NLS-pyruvate kinase reporter protein conferred the property of cytoplasmic accumulation onto the heterologous protein. Cytoplasmic accumulation of both the aa 225-237 and 218-227 containing reporters was minimal in the presence of the inhibitor leptomycin B, indicating that both motifs mediated Crm-1-dependent export. Mutations in the NES signal sequences abolished the ability of Mta to mediate cytoplasmic accumulation of BALF2 replication gene transcripts. This included mutation of the LXL motif which still showed cytoplasmic shuttling, suggesting that the NES mutations might have additional effects on Mta function. Wild-type Mta co-immunoprecipitated with the splicing factor SC35 and colocalized with SC35 in transfected cells, modifying endogenous SC35 distribution within the nucleus to give more intense, rounded spots. Interestingly, the NES mutant proteins appeared to have altered interactions with the splicing complex, binding more tightly to SC35 in co-immunoprecipitation assays. These observations suggest a linkage between the splicing and export functions of Mta.
Collapse
Affiliation(s)
- L Chen
- Molecular Virology Laboratories, Department of Pharmacology and Molecular Sciences, Johns Hopkins School of Medicine, 1650 Orleans Street, Baltimore, Maryland 21231, USA
| | | | | | | | | |
Collapse
|
46
|
Abstract
Zta has a dual role in the Epstein-Barr virus (EBV) lytic cycle, acting as a key regulator of EBV lytic gene expression and also being essential for lytic viral DNA replication. Zta's replication function is mediated in part through interactions with the core viral replication proteins. We now show interaction between Zta and the helicase (BBLF4) and map the binding region to within amino acids (aa) 22 to 86 of the Zta activation domain. In immunofluorescence assays, green fluorescent protein (GFP)-tagged BBLF4 localized to the cytoplasm of transfected cells. Cotransfection of Zta resulted in translocation of BBLF4-GFP into the nucleus indicating interaction between these two proteins. However, Zta with a deletion of aa 24 to 86 was unable to mediate nuclear translocation of BBLF4-GFP. Results obtained with Zta variants carrying deletions across the aa 24 to 86 region indicated more than one contact site for BBLF4 within this domain, and this was reinforced by the behavior of the four-point mutant Zta (m22/26,74/75), which was severely impaired for BBLF4 interaction. Binding of BBLF4 to Zta was confirmed using GST affinity assays. In both cotransfection-replication assays and replication assays performed in EBV-positive P3HR1 cells, the Zta (m22/26,74/75) mutant was replication defective. In Zta-transfected D98-HR1 cells, replication compartments could be detected by immunofluorescence staining using anti-BMRF1 monoclonal antibody. Cells transfected with Zta variants that were defective for helicase binding still formed replication compartments, but Zta was excluded from these compartments. These experiments reveal a role for the Zta-helicase interaction in targeting Zta to sites of viral DNA replication.
Collapse
Affiliation(s)
- G Liao
- Oncology Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21231, USA
| | | | | |
Collapse
|
47
|
Sun Y, Wang L, Liao G, Xu C, Gao X, Yang Q, Qian S. Pneumatic lithotripsy versus laser lithotripsy in the endoscopic treatment of ureteral calculi. J Endourol 2001; 15:587-90. [PMID: 11552781 DOI: 10.1089/089277901750426346] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [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: 11/12/2022] Open
Abstract
PURPOSE To compare the efficacy, safety, and features of pneumatic lithotripsy (PL) with those of laser lithotripsy (LL) and present our clinical experience in the endoscopic management of ureteral calculi. PATIENTS AND METHODS From August 1994 to February 2000, 285 consecutive patients underwent endoscopic lithotripsy with either the Swiss Lithoclast pneumatic lithotripter (145 patients) or the Ho:YAG laser lithotripter (140 patients) for the treatment of ureteral calculi. RESULTS In one single session, the overall successful stone fragmentation rate of LL was higher than that of PL (95.7% v 69.7%; P < 0.01). The average time to stone-free status was shorter for LL than for PL (18 days v 31 days; P < 0.01). No major complications were observed in LL, while five ureteral perforations were encountered in PL. CONCLUSIONS Laser lithotripsy has advantages over PL in high efficiency of stone fragmentation and a low complication rate. Laser lithotripsy is a powerful, effective, and safe treatment modality for ureteral calculi.
Collapse
Affiliation(s)
- Y Sun
- Department of Urology, Changhai Hospital, Second Military Medical University, China.
| | | | | | | | | | | | | |
Collapse
|
48
|
Krithivas A, Young DB, Liao G, Greene D, Hayward SD. Human herpesvirus 8 LANA interacts with proteins of the mSin3 corepressor complex and negatively regulates Epstein-Barr virus gene expression in dually infected PEL cells. J Virol 2000; 74:9637-45. [PMID: 11000236 PMCID: PMC112396 DOI: 10.1128/jvi.74.20.9637-9645.2000] [Citation(s) in RCA: 160] [Impact Index Per Article: 6.7] [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: 11/20/2022] Open
Abstract
The human herpesvirus 8 (HHV-8) latency-associated nuclear antigen (LANA) is expressed in all latently HHV-8 infected cells and in HHV-8-associated tumors, including primary effusion lymphoma (PEL). To better understand the contribution of LANA to tumorigenesis and to the PEL phenotype, we performed a yeast two-hybrid screen which identified the corepressor protein SAP30 as a LANA binding protein. SAP30 is a constituent of a large multicomponent complex that brings histone deacetylases to the promoter. Glutathione S-transferase affinity assays confirmed interaction between LANA and SAP30 and also demonstrated interactions between LANA and two other members of the corepressor complex, mSin3A and CIR. The corepressors bound to the amino-terminal 340-amino-acid domain of LANA. In transient expression assays, this same domain of LANA mediated repression when targeted to a 5xGal4tk-CAT reporter as a GAL4-LANA fusion. PEL cells have the unusual feature that they are frequently dually infected with both HHV-8 and Epstein-Barr virus (EBV). We found that EBV EBNA-1 expression is downregulated in PEL cells at both the RNA and protein levels. In transient expression assays, LANA repressed activated expression from the EBV Qp and Cp latency promoters. Reduction of endogenous Qp activity could also be demonstrated in EBV-infected Rael cells transfected with a LANA expression plasmid. In contrast to the effect of LANA on EBV latency promoters, LANA activated expression from its own promoter. The data indicate that LANA can mediate transcriptional repression through recruitment of an mSin3 corepressor complex and further that LANA-mediated repression is likely to contribute to the low level of EBV latency gene expression seen in dually infected PEL cells.
Collapse
Affiliation(s)
- A Krithivas
- Department of Pharmacology and Molecular Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland 21231, USA
| | | | | | | | | |
Collapse
|
49
|
Yu B, Li Y, Sheng Q, Liao G, Wu Y. [DNA damage and c-myc gene expression of NIH3T3 cell induced by superoxide anion]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2000; 22:259-62. [PMID: 12903472] [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: 03/04/2023]
Abstract
OBJECTIVE To study the DNA damage, membrane lipid peroxidation, and c-myc gene expression of NIH3T3 cell induced by superoxide anion(O2.-). METHODS The superoxide anion(O2.-) was produced by reactive system of xanthine-xanthine oxidase (X-XO) and the DNA-EB complex, malondialdehyde (MDA) content and expression of c-myc gene were measured by means of fluorescence, thiobarbituric acid (TBA) assay and DNA-RNA situ hybridization with digoxigenin labeled probes respectively. RESULTS The O2.- of high concentration(X: 20 micrograms, XO: 2 x 10(-3) U) reacted with isolated DNA from NIH3T3 cell directly which caused DNA damage obviously. When the O2.- of high concentration reacted with whole NIH3T3 cell, the amount of MDA increased and fluorescence intensity of DNA-EB complex decreased which mean lipid peroxidation of membrane and gene damage of the cell respectively. When the producing O2.- of high concentration reactive system existing FeSO4, the phenomena mentioned above showed obviously. Enough amount of catalase showed the inhibit effects, but it could not completely inhibit the DNA damage of whole cell. The c-myc gene expression was observed in the cell treated with O2.- of middle (X: 4 micrograms, XO: 4 x 10(-4) U) and high concentration, but it was not observed in the cell treated with O2.- of low concentration(X: 0.4 micrograms, XO: 4 x 10(-5) U). CONCLUSIONS DNA damage of the whole cell induced by extracellular O2.- was able to act through the pathway of membrane lipid peroxidation in which hydrogen peroxide is important and the other pathways such as signal transduction of the cell might also be existed. The expression of c-myc gene of NIH3T3 cell induced by O2.- was related closely to the concentration of O2.-.
Collapse
Affiliation(s)
- B Yu
- Department of Biophysics, Institute of Basic Medical Sciences, CAMS, PUMC, Beijing 100005, China
| | | | | | | | | |
Collapse
|
50
|
Li Y, Liao G, Deng J, Wu Y. [Study on the role of superoxide anion in promoting proliferation and transformation of rat liver oval cell line WB-E344]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2000; 22:106-10. [PMID: 12903508] [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: 03/04/2023]
Abstract
OBJECTIVE To study the role of superoxide anion (O2.-) in promoting proliferation and transformation of rat liver oval cell strain WB-F344. METHODS WB-F344 cells cultured were stimulated directly by O2.- generated by interaction of xanthine with xanthine oxidase (X-XO). The effect of O2.- in promoting proliferation of WB cells was investigated by using MTT colorimetric analysis, 3H-Tdr incorporation liquid scintillation counter and 3H-Tdr incorporation autoradiography. WB cells initiated with N-methyl-N'-nitro-N-nitrosoguanidine(MNNG) were promoted by stimulating continuously with O2.- of low concentration (X: 100 mumol/L, XO: 0.2 mU/ml). The transformation effect was tested by morphologic observation, karyotype analysis and anchorage-independent growth assay. RESULTS Proliferation of WB cells was induced obviously by O2.- of low concentration for only one time. WB cells initiated with MNNG were transformed by action with O2.- of low concentration continuously for 15 d and typical morphologic character of transformed cells was observed. In karyotype analysis the cells chromosome number changed and the frequency of structure aberration raised dramatically. Also the transformed cells could form clone on self-solid culture medium. CONCLUSIONS The biological effect of O2.- was related closely with its dose; The effects of low concentration in promoting proliferation and transformation of liver oval cells indicate its important role in hepatocarcinogenesis and antioxidation was able to provide a new clue in prevention and cure of hepatoma.
Collapse
Affiliation(s)
- Y Li
- Department of Biophysics, Institute of Basic Medical Science, CAMS, PUMC, Beijing 100005, China
| | | | | | | |
Collapse
|