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Yang L, Wang CY, Zhang YD, Geng Q, Qin WH. [Determination of cobalt and tungsten in human urine by inductively coupled plasma mass spectrometry]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2023; 41:371-374. [PMID: 37248085 DOI: 10.3760/cma.j.cn121094-20211214-00614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Objective: To establish a inductively coupled plasma mass spectrometry method for the determination of trace cobalt and tungsten in human urine. Methods: The authors used 1% nitric acid solution as diluent in October-December 2021, the sample dilution factor and internal standard element were optimized by single factor rotation experiment, and the difference between the working curve and the standard curve was compared. Results: The method uses working curve to determine cobalt and tungsten in urine, the linear range of this method was 0.0~10.0 μg/L, the correlation coefficient was 0.999 9, the detection limits respectively were 0.005 μg/L (cobalt) and 0.09 μg/L (tungsten), the recoveries of samples respectively were 87.0%~100.2% (cobalt) and 89.4%~104.8% (tungsten), the relative standard deviations respectively were 0.4%~4.4% (cobalt) and 0.6%~3.8% (tungsten) . Conclusion: A simple and rapid method for determination of cobalt and tungsten in urine has been established. This method has the advantages of simple operation, high sensitivity, low detection limit and good stability. It is suitable for determination of cobalt and tungsten in urine of all kinds of people.
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Affiliation(s)
- L Yang
- The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases) Occupational and Environmental Testing and Inspection Center, Henan Provincial Key Laboratory of Chemical Toxicology Detection, Zhengzhou 450052, China
| | - C Y Wang
- The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases) Occupational and Environmental Testing and Inspection Center, Henan Provincial Key Laboratory of Chemical Toxicology Detection, Zhengzhou 450052, China
| | - Y D Zhang
- The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases) Occupational and Environmental Testing and Inspection Center, Henan Provincial Key Laboratory of Chemical Toxicology Detection, Zhengzhou 450052, China
| | - Q Geng
- The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases) Occupational and Environmental Testing and Inspection Center, Henan Provincial Key Laboratory of Chemical Toxicology Detection, Zhengzhou 450052, China
| | - W H Qin
- The Third People's Hospital of Henan Province (Henan Hospital for Occupational Diseases) Occupational and Environmental Testing and Inspection Center, Henan Provincial Key Laboratory of Chemical Toxicology Detection, Zhengzhou 450052, China
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2
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Lu ZL, Gao ML, Deng Y, Liu BH, Li N, Geng Q. [Role of Dipeptidyl peptidase inhibitors in lung ischemia-reperfusion injury]. Zhonghua Jie He He Hu Xi Za Zhi 2022; 45:1266-1270. [PMID: 36480859 DOI: 10.3760/cma.j.cn112147-20220308-00181] [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: 06/17/2023]
Abstract
Lung ischemia-reperfusion injury (LIRI)is a common complication after lung transplantation and cardiopulmonary bypass. It is an important factor affecting the success rate of transplantation. Its specific pathogenesis has not yet been fully elucidated. It is very significant to find the targets and drugs for the prevention and treatment of LIRI in order to improving the utilization rate of "marginal donor lung" and the long-term survival rate of lung transplant patients. Dipeptidyl peptidase 4(DPP4) inhibitors are a class of oral hypoglycemic agents. Previous studies have shown that DPP4 inhibitors have a variety of pharmacological activities, including anti-inflammatory, anti-fibrotic, immunomodulatory and other extrapancreatic functions. Recent studies have shown that DPP4 inhibitors may alleviate LIRI through various mechanisms, including inhibiting inflammatory responses, reducing oxidative stress, regulating blood glucose levels, and activating autophagy. This article reviewed the clinical and preclinical applications and mechanisms of DPP4 inhibitors in LIRI.
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Affiliation(s)
- Z L Lu
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - M L Gao
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Y Deng
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - B H Liu
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - N Li
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Q Geng
- Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
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Chang Y, Geng Q, Bao Q, Hu P. Retraction Note: Salinomycin enhances radiotherapy sensitivity and reduces expressions of BIRC5 and NEIL2 in nasopharyngeal carcinoma. Eur Rev Med Pharmacol Sci 2022; 26:6012. [PMID: 36111899 DOI: 10.26355/eurrev_202209_29611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The article "Salinomycin enhances radiotherapy sensitivity and reduces expressions of BIRC5 and NEIL2 in nasopharyngeal carcinoma, by Y. Chang, Q. Geng, Q. Bao, P. Hu, published in Eur Rev Med Pharmacol Sci 2020; 24 (11): 6409-6416-DOI: 10.26355/eurrev_202006_21539-PMID: 32572938" has been retracted by the authors. After publication, the article was questioned on PubPeer. Concerns were raised about Figure 3 and the reliability of the published results. The same authors stated that the study was not conducted according to the required standard procedures. The Publisher apologizes for any inconvenience this may cause https://www.europeanreview.org/article/21539.
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Affiliation(s)
- Y Chang
- Department of Radiotherapy, Linyi Cancer Hospital, Linyi, China
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Zhou L, Mo M, Xu S, Zhang H, Geng Q, Zeng Y. O-191 Endometriosis is associated with a lowered cumulative live birth rate by alters the macrophage polarization and the cytokine concentrations in follicular fluid. Hum Reprod 2022. [DOI: 10.1093/humrep/deac106.101] [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: 11/14/2022] Open
Abstract
Abstract
Study question
The impact of endometriosis on the outcomes of ART is still ambiguous and the mechanism by which endometriosis impacts fertility has not been fully elucidated
Summary answer
Endometriosis was associated with low CLBR in IVF, which might be due to the change of follicular microenvironment and compromising the quality of embryos.
What is known already
Despite the great advantages of IVF treatment in endometriosis-linked infertility, the impact of endometriosis on outcomes of infertility management with ART is controversial and few studies focused on the association between endometriosis and CLBR. Numerous mechanisms have been proposed in an effort to delineate the multifaceted pathophysiology that induces impairment of reproductive dynamics in patients with endometriosis. Reactive oxygen species, dysregulation of the immune system and cellular architectural disruption constitute the crucial mechanisms that detrimentally affect oocyte and embryo developmental potential.
Study design, size, duration
This study retrospectively included 433 patients with endometriosis and 1299 patients with tuber factor infertility to evaluate the impact of endometriosis on IVF pregnancy outcome between January 2016 and December 2018.The basic study prospectively recruited 30 patients with ovarian endometriosis and 35 controls with tubal factor infertility to analyze polarization stage of macrophages in their follicular fluid, and another 20 females with ovarian endometriosis and 30 controls to detect cytokines in their FF.
Participants/materials, setting, methods
Data on all women undergoing fresh or frozen IVF treatment cycles were analysed to compare the CLBR between endometriosis and tuber factor infertility patients. A cytometry panel of 4 antibodies (CD45, CD3, CD80, CD163) was designed to enumerate the numbers of MI and MII macrophages from the cell sediment from FF samples. Quantibody® array was utilized to determine the concentration of 10 cytokines in FF, including IFN-γ, IL-1α, IL-1β, IL-10,IL-13,IL-4, IL-6, IL-8, MCP-1 and TNF-α.
Main results and the role of chance
The results showed that patients with endometriosis were associated with noticeably fewer retrievable oocytes, a lower oocyte maturity rate, decreased numbers of available and high-quality embryos (all p < 0.001) in comparison with the control group. The clinical pregnancy and live birth rate of the endometriosis group were lower in the frozen-thawed embryo transfer cycles (p = 0.028 and p = 0.008, respectively), which leading to a declined cumulative live birth rate (CLBR) (p = 0.001). Logistic regression analysis indicated a close association between endometriosis and low CLBR (p = 0.002). Furthermore, the numbers of type I and type II macrophages in follicular fluid (FF) of patients with ovarian endometriosis were significantly increased compared with the control group (p < 0.001). The expressions of IL-1α, IL-1β, TNF-α, IL-6, IL-13, and IL-10 in FF were higher in endometrioma group(p < 0.05). The increased expression of cytokines was negatively correlated with embryo outcomes, including the numbers of total oocytes retrieved, mature oocytes, and fertilized oocytes, and the numbers of high-quality blastocysts and embryos. Additionally, IL-6 and IL-8 were positively correlated with AMH, rate of available blastocysts, number of blastocysts formed and available blastocysts, but were negatively associated with rate of MII oocytes.
Limitations, reasons for caution
The present study being of a retrospective and monocentric study, may not come to a very convincing conclusion, and some unknown biases might still exist due to possible underestimation of some confounders.
Wider implications of the findings
Collectively, our results indicate that endometriosis does adversely affect pregnancy outcomes of ART, as women with endometriosis produce a lower quantity of oocytes and embryos. Moreover, endometriosis might play a role in oocyte or embryo outcomes via regulating the production of cytokines or the number of immune cells in FF.
Trial registration number
no
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Affiliation(s)
- L Zhou
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
| | - M Mo
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
| | - S Xu
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
| | - H Zhang
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
| | - Q Geng
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
| | - Y Zeng
- Shenzhen Zhongshan Urology Hospital, Fertility Center , Shenzhen-Guangdong, China
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Mo M, Zheng Q, Xu S, Zhang H, Geng Q, Zeng Y. P-620 Hormone replacement therapy with GnRH agonist pretreatment improves pregnancy outcomes in patients with previous intrauterine adhesions. Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.570] [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: 11/12/2022] Open
Abstract
Abstract
Study question
Is there an optimal endometrial preparation protocol of frozen-thawed embryo transfer (FET) for patients with history of intrauterine adhesions (IUAs)?
Summary answer
Hormone replacement therapy with GnRH agonist pretreatment (HRT+GnRHa) is superior to conventional HRT protocol to improve pregnancy outcomes in patients with IUAs.
What is known already
FET follow hysteroscopic adhesiolysis or therapeutic treatment is being widely adopted in patients with IUAs. Proper endometrial preparation plays a key role to maximize IVF success rate and improve pregnancy results. However, it remains unclear whether there is an optimal endometrial preparation protocol for patients with history of IUAs.
Study design, size, duration
This was a retrospective cohort study of 1002 FET cycles with history IUAs in our fertility center between January 2015 to December 2020. The study was approved by the hospital's Ethics Committee.
Participants/materials, setting, methods
Eight hundred and forty-two conventional HRT cycles and 160 HRT+GnRHa cycles met the inclusion criteria were enrolled. Pregnancy outcomes were compared between the two groups. Logistic regression analysis was performed to adjust for important confounders. P < 0.05 was considered statistically significant.
Main results and the role of chance
The HRT+GnRHa group was associated with higher cycle rank (1.79 vs 2.17, P =0.026) and longer infertility duration (3.04 vs 3.69, P =0.000) compared with conventional HRT group. While the latter had a higher proportion of blastocyst embryo transferred (P =0.024). There were no statistically significant differences regarding the parental age at oocyte retrieval, body mass index (BMI), number of total embryos transferred and top embryo transferred, proportion of nulliparity, indication of IVF treatment and fertilization method, and endometrial thickness. Logistic regression indicated that after controlling for potential confounders, the HRT+GnRHa group achieved higher incidence of clinical pregnancy (aOR 1.474, 95% CI: 1.002-2.170, P =0.049), ongoing pregnancy (aOR 1.823, 95% CI: 1.207-2.753, P =0.004), and live birth (aOR 1.975, 95% CI: 1.306-2.988, P =0.000) than the conventional HRT group. The miscarriage rate was comparable between the two groups (aOR 0.613, 95% CI: 0.293-1.283, P =0.194). Our results suggested that HRT+GnRHa is over conventional HRT protocol to improve pregnancy outcomes of patients with previous IUAs.
Limitations, reasons for caution
The primary limitation of this study was its retrospective nature, and it was difficult to distinguish some confounding factors. Besides, there was no grading of IUA severity as most adhesion separation surgeries were not performed in our hospital, and the detailed medical history was not available.
Wider implications of the findings
Our study offers evidence for the superiority of HRT with GnRH-a pretreatment to conventional HRT protocol in improving the pregnancy prognosis of patients with previous IUAs. Our finding deserves further confirmation in clinical practice.
Trial registration number
2018YFC1003900/2018YFC1003904, SZSM201502035
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Affiliation(s)
- M Mo
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
| | - Q Zheng
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
| | - S Xu
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
| | - H Zhang
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
| | - Q Geng
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
| | - Y Zeng
- Shenzhen Zhongshan Urology Hospital, ART center , Shenzhen, China
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Abstract
BACKGROUND AND AIMS Caffeine is a worldwide popularly consumed constituent in foods that can exert physiological effects. However, previous researches about the relationship between caffeine intake and serum uric acid (SUA) were limited and controversial. Therefore, we sought to investigate that relationship in U.S. adults. METHODS In this cross-sectional study, the total sample of 7888 selected participants (3838 males and 4050 females) were identified from the National Health and Nutritional Examination Surveys (NHANES) 2015-2018. All subjects were tested for serum uric acid levels (μmmol/L), and their daily caffeine intakes (mg/d) were obtained by an average of two 24-hour dietary recalls. Multivariate linear regression models were used to evaluate the association between two variables in total subjects and subgroup analyses. Generalized additive models with smooth curve fittings were also performed. RESULTS Multivariate regression analyses showed caffeine intake was negatively correlated with SUA after adjustment of other confounders. The subgroup analyses stratified by gender showed the negative correlation of caffeine intake with SUA was statistically significant in males but not in females. Furthermore, we observed a nonlinear inverse association of caffeine intake with SUA (P nonlinear <0.001) in the generalized additive model, followed by an inverted U-shaped curve (inflection point: 60.5mg/d) for all participants. This inverted U-shaped relationship between them could also be found in both genders, individuals aged below 60 years old, overweight (BMI of 25 to 30), and Non-Hispanic White individuals. CONCLUSIONS This study indicated that caffeine intake exhibited an inverse correlation with SUA, especially in males. In addition, this inverse relationship was nonlinear, which followed an inverted U-shaped curve.
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Affiliation(s)
- A Liu
- Huan Ma, Qingshan Geng, Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106 Second Zhongshan Road, Guangzhou 510080, China, ;
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Lin HC, Li J, Cheng DD, Zhang X, Yu T, Zhao FY, Geng Q, Zhu MX, Kong HW, Li H, Yao M. Nuclear export protein CSE1L interacts with P65 and promotes NSCLC growth via NF-κB/MAPK pathway. Mol Ther Oncolytics 2021; 21:23-36. [PMID: 33869740 PMCID: PMC8039531 DOI: 10.1016/j.omto.2021.02.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 03/06/2021] [Indexed: 12/24/2022]
Abstract
Non-small cell lung cancer (NSCLC) is characterized with high morbidity and mortality, mainly due to frequent recurrence and metastasis. However, the underlying molecular mechanisms of NSCLC tumorigenesis are largely unclear. Through data mining in the ONCOMINE and Gene Expression Omnibus (GEO) databases, the expression of CSE1L (chromosome segregation like 1 protein/CAS), an exportin, was identified to be significantly upregulated in NSCLC and positively associated with poor prognosis of patients. By use of in vitro and in vivo gain- and loss-of-function experiments, we found that CSE1L can promote NSCLC cell proliferation while inhibiting cell apoptosis. Through immunoprecipitation and mass spectrometry experiments, we demonstrated that CSE1L interacted with RELA (named as P65) and affected its location in the nucleus. Moreover, we found that one of the mechanisms by which CSE1L promotes proliferation and inhibits apoptosis is through activating the nuclear factor-κB (NF-κB)/mitogen-activated protein kinase (MAPK) signaling pathway. In summary, our findings indicated an oncogenic role of CSE1L in NSCLC tumorigenesis.
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Affiliation(s)
- H C Lin
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - J Li
- Department of Oncology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - D D Cheng
- Department of Orthopedics, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - X Zhang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - T Yu
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - F Y Zhao
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Q Geng
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - M X Zhu
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - H W Kong
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - H Li
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - M Yao
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
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Jiang B, Geng Q, Li T, Mohammad Firdous S, Zhou X. Morin attenuates STZ-induced diabetic retinopathy in experimental animals. Saudi J Biol Sci 2020; 27:2139-2142. [PMID: 32714041 PMCID: PMC7376113 DOI: 10.1016/j.sjbs.2020.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 04/19/2020] [Revised: 05/21/2020] [Accepted: 06/01/2020] [Indexed: 01/14/2023] Open
Abstract
Diabetic retinopathy (DR) occurs in untreated diabetic patients due to the strong influence of oxidative stress. Bioflavonoids are well known for their antioxidant property. Morin, a bioflavonoid, has been demonstrated for its antioxidant as well as antidiabetic activity. Thus, this research work intended to determine the ameliorative impact of morin in DR rats using STZ-induced type 1 diabetic model. To induce type 1 diabetic in rats STZ (60 mg/kg) was administered intraperitoneally. Grouping of animals was done as described below (n = 6), where, group I - normal control, group II - diabetic control, group III - morin (25 mg/kg), group IV - morin (50 mg/kg), and group V - metformin (350 mg/kg) were used. All the animals underwent treatment for 60 days as given above. It was observed that supplementation of morin (25 and 50 mg/kg) showed a noteworthy decline in elevated serum glucose level. Moreover, decrease in the level of LPO and improved activity of endogenous antioxidants (GPx, CAT, and SOD) was observed in morin treated groups. It also notably drops the concentration of TNF-α, IL-1β, and VEGF in the tissue homogenate of the retina. Furthermore, it increased the retinal thickness and cell count in the ganglion cell layer of the retina in diabetic animals. Hence, we can conclude that morin encumbers the progression of DR in diabetic animals, which may be via antioxidant property and suppression of TNF-α, IL-1β, and VEGF.
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Key Words
- AGEs, Advanced glycated end products
- Antioxidants
- BGL, Blood glucose level
- BRB, Blood retinal barrier
- CAT, Catalase
- DAG, Diacylglycerol
- Diabetic retinopathy
- GPx, Glutathione peroxidase
- IL-1β and VEGF
- IL-1β, Interleukin 1 beta
- LPO, Lipid peroxidase
- Morin
- PKC, Protein kinase C
- ROS, Reactive oxygen species
- SOD, Superoxide dismutase
- STZ, Streptozotocin
- TNF-α
- TNF-α, Tumor necrosis factor alpha
- VEGF, Vascular endothelial growth factor
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Affiliation(s)
- Bo Jiang
- Department of Ophthalmology, Jinshan Hospital of Fudan University, Jinshan District, Shanghai 201508, China
| | - Qingsen Geng
- Department of Eye Fundus,Liaocheng Guangming Ophthalmological Hospital, Liaocheng, Shandong 252000, China
| | - Tao Li
- Department of Ophthalmology, Jinshan Hospital of Fudan University, Jinshan District, Shanghai 201508, China
| | - Sayeed Mohammad Firdous
- Department of Pharmacology, Calcutta Institute of Pharmaceutical Technology & AHS, Uluberia, Howrah 711316, West Bengal, India
| | - Xiaodong Zhou
- Department of Ophthalmology, Jinshan Hospital of Fudan University, Jinshan District, Shanghai 201508, China
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Chang Y, Geng Q, Bao Q, Hu P. Salinomycin enhances radiotherapy sensitivity and reduces expressions of BIRC5 and NEIL2 in nasopharyngeal carcinoma. Eur Rev Med Pharmacol Sci 2020; 24:6409-6416. [PMID: 32572938 DOI: 10.26355/eurrev_202006_21539] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
OBJECTIVE The aim of this study was to investigate the effects of salinomycin (Sal) on expressions of baculoviral IAP repeat-containing 5 (BIRC5) and Nei endonuclease VIII-like 2 (NEIL2) and radiotherapy sensitivity of nasopharyngeal carcinoma (NPC). MATERIALS AND METHODS Human NPC CNE-2 cell lines were used as research objects in this study. Subsequently, the cells received intervention with Sal at different concentrations, radioactive rays at different doses and Sal combined with radioactive rays. The growth inhibition rate of CNE-2 cells was detected via methyl thiazolyl tetrazolium (MTT) assay. The dose-effect relations of Sal, radioactive rays and combination therapy with the inhibitory effect on CNE-2 cells were obtained. CNE-2 cells receiving intervention with Sal at an appropriate concentration or radioactive rays at an appropriate dose alone and Sal combined with radioactive rays were used as intervention groups (Sal group, Radiation group and Combination group). However, those added with an equal amount of DMSO were set as Control group. Next, the cycle, apoptosis and apoptotic morphology of CNE-2 cells were observed via flow cytometry and Hoechst assay, respectively. Moreover, the expressions of apoptosis-related proteins Caspase-3, B-cell lymphoma-2 (Bcl-2) and Bcl-2 associated X protein (Bax), as well as BIRC5 and NEIL2 proteins in CNE-2 cells were determined using Western blotting. RESULTS Under the intervention with Sal or radioactive rays alone, the growth inhibition rate of CNE-2 cells rose in a concentration/dose-dependent manner. With the increase in Sal concentration in combination therapy, the growth inhibition rate of CNE-2 cells significantly increased (p<0.05). Compared with Control group, Sal group, Radiation group, and Combination group exhibited remarkably lower colony formation rate, higher proportion of CNE-2 cells in the G2/M phase, enhanced apoptosis of CNE-2 cells with nuclear fragmentation, increased expressions of pro-apoptotic proteins Caspase-3 and Bax, decreased expression of anti-apoptotic protein Bcl-2, and lower protein expressions of BIRC5 and NEIL2 in cells (p<0.05). Compared with Radiation group, the Combination group had significantly decreased colony formation rate, increased proportion of CNE-2 cells in the G2/M phase, enhanced apoptosis of CNE-2 cells with more nuclear fragmentation and other apoptosis characteristics, increased expressions of pro-apoptotic proteins Caspase-3 and Bax, decreased expression of anti-apoptotic protein Bcl-2, and decreased protein expressions of BIRC5 and NEIL2 in cells (p<0.05). CONCLUSIONS Sal enhances the radiotherapy sensitivity of NPC and reduces the protein expressions of BIRC5 and NEIL2 in cells.
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Affiliation(s)
- Y Chang
- Department of Radiotherapy, Linyi Cancer Hospital, Linyi, China.
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Geng Q, Wang M, Lu Y, Zhu W, Sun Z, Jiang H. P3.01-49 Effciency of Low-Dosage Apatinib Monotherapy in Treatment of Advanced Lung Squamous Cell Carcinoma. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1609] [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: 11/15/2022]
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Guo J, Wang F, Geng Q, Gao Q, Han Q, Yan B, Zhang J, Zhang X, Yu G, Zeng Y, Liu Y. 561 Analysis of unsuccessful treatment of lifelong premature ejaculation with dapoxetine. J Sex Med 2018. [DOI: 10.1016/j.jsxm.2018.04.467] [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: 11/17/2022]
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Wu WQ, Liu Y, Geng Q, Luo FW, Chen WB, Yuan H, Xie JS. [The prenatal genetic diagnosis of a family with complete androgen insensitivity syndrome]. Zhonghua Yi Xue Za Zhi 2016; 96:3793-3796. [PMID: 28057092 DOI: 10.3760/cma.j.issn.0376-2491.2016.47.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To identify the Androgen Receptor (AR) gene mutation of one family with complete androgen insensitivity syndrome (CAIS) and to establish the methods of prenatal genetic diagnosis for CAIS. Methods: The AR gene exons of the family were amplified by PCR and sequenced directly. Linkage analysis was performed by using the CAG repeats in the exon1 of AR gene to assure accuracy of the prenatal diagnosis. Results: We found a frameshift mutation c. 2546del A (p. Asn849Ile fsX34) in the exon7 of AR gene in the proband.The mutation had not been reported before.The mother of the proband went through two times prenatal genetic diagnosis for her next pregnancies, both fetuses were male and did not get the mutation.The results of the linkage analysis were consistent with the sequencing results. Conclusion: A novel AR mutations in a CAIS family have been confirmed. The method of prenatal genetic diagnosis was established, and worked effectively in the CAIS family.
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Affiliation(s)
- W Q Wu
- Shenzhen Maternity and Child Healthcare Hospital, Shenzhen, Guangdong 518028, China
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Deng HP, Chen L, Fan T, Zhang B, Xu Y, Geng Q. Long non-coding RNA HOTTIP promotes tumor growth and inhibits cell apoptosis in lung cancer. Cell Mol Biol (Noisy-le-grand) 2015; 61:34-40. [PMID: 26265284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 08/07/2015] [Indexed: 06/04/2023]
Abstract
Lung cancer is one of the leading causes of cancer-related deaths worldwide. Early diagnosis is the best defense against this threat and is therefore of vital importance. In this study, we investigated the role of long non-coding RNA HOTTIP in the tumor growth of lung cancer. Initially, we found that expression of HOTTIP was significantly elevated in 20 cases of lung cancer. HOTTIP was also differentially expressed in a consecutive of lung cancer cell lines. Furthermore, specific shRNA against HOTTIP was employed to deplete expression of HOTTIP in A549 cells and NCI-H446 cells. After successfully depletion of HOTTIP, cell proliferation and colony formation were significantly inhibited in vitro. Tumor growth in vivo was also suppressed after depletion of HOTTIP in a mouse model of lung cancer. Moreover, depletion of HOTTIP caused cell cycle arrest in G0/G1 phase and induced significant cell apoptosis. Cell cycle regulators Cdc25C, Cyclin B1 and Cyclin D1 were decreased upon depletion of HOTTIP. Pro-apoptotic factor Bad was up-regulated, whereas anti-apoptotic factors Bcl-2 and Bcl-xL were down-regulated after HOTTIP ablation. These data suggest that lncRNA HOTTIP contributes to tumor growth in vivo and in vitro and inhibits cell apoptosis in lung cancer.
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Affiliation(s)
- H-P Deng
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China
| | - L Chen
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China
| | - T Fan
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China
| | - B Zhang
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China
| | - Y Xu
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China
| | - Q Geng
- Renmin Hospital of Wuhan University Department of Cardiothoracic Surgery Hubei China szgqing@126.com
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Geng Q, Chen H, Ren JY, Song JX, Li SF. [microRNA-126 delivered by microparticles mediates intercellular signal transmission]. Beijing Da Xue Xue Bao Yi Xue Ban 2014; 46:894-898. [PMID: 25512279] [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: 06/04/2023]
Abstract
OBJECTIVE To investigate the role of microRNAs (miRNAs) in mediating intercellular signaling. METHODS Microparticles (MP) from HUVEC and 293T were isolated by sequential centrifugation. THP-1 was co-cultured with microparticles. And then the migration of THP-1 was measured by transwell. real-time PCR and Western blotting were used to study the related mechanisms. RESULTS Compared with the microparticles from 293T, MP from HUVEC could promote the migration of monocytes (P<0.05) and upregulate the expression of CXCR4 mRNA and protein (P<0.05). MiRNA-126 deficient MP could downregulate the migration of monocytes (P<0.05) and the expression of CXCR4 mRNA and protein (P<0.05) compared with miRNA-126 abundant MP. CONCLUSION Microparticles from HUVEC could promote the migration of monocytes. As carriers, microparticles could mediate intercellular signaling.
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Affiliation(s)
- Q Geng
- Department of Cardiology, Peking University People's Hospital, Beijing 100044
| | - H Chen
- Department of Cardiology, Peking University People's Hospital, Beijing 100044
| | - J Y Ren
- Department of Cardiology, Peking University People's Hospital, Beijing 100044
| | - J X Song
- Department of Cardiology, Peking University People's Hospital, Beijing 100044
| | - S F Li
- Department of Cardiology, Peking University People's Hospital, Beijing 100044
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Yu S, Geng Q, Ma J, Sun F, Yu Y, Pan Q, Hong A. Heparin-binding EGF-like growth factor and miR-1192 exert opposite effect on Runx2-induced osteogenic differentiation. Cell Death Dis 2013; 4:e868. [PMID: 24136232 PMCID: PMC3824672 DOI: 10.1038/cddis.2013.363] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 08/06/2013] [Accepted: 08/09/2013] [Indexed: 12/20/2022]
Abstract
Osteoblast differentiation is a pivotal event in bone formation. Runt-related transcription factor-2 (Runx2) is an essential factor required for osteoblast differentiation and bone formation. However, the underlying mechanism of Runx2-regulated osteogenic differentiation is still unclear. Here, we explored the corresponding mechanism using the C2C12/Runx2(Dox) subline, which expresses Runx2 in response to doxycycline (Dox). We found that Runx2-induced osteogenic differentiation of C2C12 cells results in a sustained decrease in the expression of heparin-binding EGF-like growth factor (HB-EGF), a member of the epidermal growth factor (EGF) family. Forced expression of HB-EGF or treatment with HB-EGF is capable of reducing the expression of alkaline phosphatase (ALP), a defined marker of early osteoblast differentiation. HB-EGF-mediated inhibition of ALP depends upon activation of the EGFR and the downstream extracellular signal-regulated kinase, c-Jun N-terminal kinase mitogen-activated protein kinase pathways as well as phosphatidylinositol 3-kinase/Akt pathway. Runx2 specifically binds to the Hbegf promoter, suggesting that Hbegf transcription is directly inhibited by Runx2. Runx2 can upregulate miR-1192, which enhances Runx2-induced osteogenic differentiation. Moreover, miR-1192 directly targets Hbegf through translational inhibition, suggesting enhancement of Runx2-induced osteogenic differentiation by miR-1192 through the downregulation of HB-EGF. Taken together, our results suggest that Runx2 induces osteogenic differentiation of C2C12 cells by inactivating HB-EGF-EGFR signaling through the downregulation of HB-EGF via both transcriptional and post-transcriptional mechanisms.
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Affiliation(s)
- S Yu
- Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangdong, Guangzhou, People's Republic of China
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16
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Pan M, Han H, Zhong C, Geng Q. Effects of genistein and daidzein on hippocampus neuronal cell proliferation and BDNF expression in H19-7 neural cell line. J Nutr Health Aging 2012; 16:389-94. [PMID: 22499464 DOI: 10.1007/s12603-011-0140-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Estrogen replacement therapy (ERT) reduces the risk of Alzheimer's disease and symptoms in postmenopausal and elderly women. However, ERT is associated with increased risk of uterine and breast cancer. Dietary phytoestrogens have been suggested as a potential alternative to ERT, while little information is available regarding the effects and the underlying mechanisms of such treatment on central neuron function. The present study aimed to determine the effects of phytoestrogens including genistein and daidzein on the proliferation and survival of the hippocampus neural cells, which are of importance in learning and memory function. MEASUREMENTS H19-7/IGF-IR neural cell line was cultured in DMEM absented of serum for 72 h, and treated with various concentrations of genistein, daidzein or 17β-estradiol. Neuronal cell viability and proliferation were determined by MTT and BrdU assay, respectively Cell cycle analysis was performed using flow cytometry. The effects of genistein and daidzein on brain-derived neurotrophic factor (BDNF) mRNA and protein expression were determined by RT-PCR and ELISA, respectively. The effect of Trk receptors inhibitor on genistein and daidzein - induced hippocampus neuronal cell proliferation was also examined. RESULTS 17β-estradiol, genistein and daidzein ranged from 20 nM to 2000 nM significantly promoted hippocampus neuronal cell viability and proliferation. Similar to the effect of 17β-estradiol, genistein and daidzein induced an increase in the percentage of cells in S phase. Genistein and daidzein significantly increased the expression of BDNF mRNA and protein levels. The effect of genistien and daidzein on hippocampus neuronal proliferation was blocked by K252a, a selective Trk receptors inhibitor. CONCLUSION This study concluded that genistein and daidzein improved hippocampus neuronal cell viability and proliferation in vitro. These neuroprotective effects might be mediated by BDNF-Trk pathway.
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Affiliation(s)
- M Pan
- Department of Nutrition, Guangdong Academy of Medical Sciences, Guangdong General Hospital, Guangzhou, P R China.
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17
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Jiang W, Tang W, Geng Q, Xu X. Inhibition of Toll-like receptor 4 with vasoactive intestinal peptide attenuates liver ischemia-reperfusion injury. Transplant Proc 2011; 43:1462-7. [PMID: 21693218 DOI: 10.1016/j.transproceed.2011.01.191] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Accepted: 01/11/2011] [Indexed: 12/30/2022]
Abstract
BACKGROUND Toll-like receptor 4 (TLR4) has attracted a great deal of attention in ischemia-reperfusion (IR) injury in recent years. Vasoactive intestinal peptide (VIP) plays an important role in anti-inflammatory and immunomodulatory activity in several animal models. There are no data available regarding the effect of VIP on TLR4 expression in IR injury in vivo. In the present study, we study the effect of VIP on TLR4 expression in mouse macrophage cell line RAW 264.7 and a mouse partial IR model. METHODS The potential inhibitory effect of VIP on TLR4 mRNA and protein in a mouse macrophage cell line and in a mouse model of partial warm hepatic IR injury was assessed. We also assessed the expression tumor necrosis factor (TNF)-α and interleukin (IL)-6 in this model. RESULTS Expression of TLR4 mRNA levels was significantly decreased at 6, 12, and 24 hours after treat with VIP in mouse macrophage cell line RAW 264.7. Expression of TLR4 mRNA, TLR4 protein, alanine aminotransferase, TNF-α, and IL-6 levels were significantly increased in the IR group but significantly decreased in groups pretreated with VIP at a concentration of 5 and 10 nmol. Hematoxylin and eosin staining show apparent edema and necrosis were observed in the IR group, but in the VIP pretreatment group, edema and necrosis in IR modes were reduced. CONCLUSION This study showed that VIP might inhibit TLR4 in vitro and in vivo, and pretreatment with VIP might inhibited TLR4 activation and reduced warm IR injury.
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Affiliation(s)
- W Jiang
- Department of Neonatal Surgery, Nanjing Children's Hospital Affiliated to Nanjing Medical University, Nanjing, China
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19
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Zhang X, Han B, Huang J, Zheng B, Geng Q, Aziz F, Dong Q. Prognostic Significance of OCT4 Expression in Adenocarcinoma of the Lung. Jpn J Clin Oncol 2010; 40:961-6. [DOI: 10.1093/jjco/hyq066] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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21
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Cao C, Zhao L, Xu D, Geng Q. Membrane-Aerated Biofilm Reactor Behaviors for the Treatment of High-Strength Ammonium Industrial Wastewater. Chem Eng Technol 2009. [DOI: 10.1002/ceat.200800450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Wang S, Xu K, Liu X, Zhou Q, Geng Q, Geng Q. Experimental study on Chinese ink as the dye for the sentinel lymph node biopsy. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.10785] [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: 11/20/2022] Open
Abstract
10785 Background: Sentinel lymph node biopsy (SLNB) is a very important method in detecting lymph nodes metastasis. There are several methods developed to detect sentinel lymph node. In this study, we will research on sentinel lymph node biopsy (SLNB) by using Chinese ink and study on its feasibility, clinical value and suitable concentration. Methods: Forty-two female rabbits were randomly divided into seven groups with 12 sides of mammaries (6 animals) in each group.The second mammary and the armpit of the same side were anatomized and injected 0.1 ml different dyes (1% isosulfan blue, 0.1%, 1%, 10%, 20%, 50%, 100% sterilized Chinese ink) at the base of the second mammary. We observed the dying time of the sentinel and the second lymph nodes and the fading time of the dying nodes. The pathological and histological examination of the sentinel lymph nodes were conducted in 5 minutes,1 hour and 2 weeks after the nodes were dyed by ink, respectively. The rabbits’ hearts, lungs, livers and kidneys were detected pathologic changes. Results: There was no obvious difference among different concentration ink on the dyeing time of the sentinel and second lymph nodes (P > 0.05),but distinctively different from 1% isosulfan blue (P < 0.05). There was no obvious difference between groups on the number of the dyed nodes (P > 0.05). But the nodes dyed by 0.1% ink were dyed too lightly to be found. The average fading time of the nodes dyed by 1% isosulfan bluewas 33.9 minutes, and the nodes dyed by ink were still dyed deeply 2 weeks after the experiment. The pathologic examination showed that the carbon aggregated in the lymph nodes sinus 5 minutes after the nodes were dyed, but was phagocytosed by Macrophage (MΦ) 1 hour after dyed. The groups (0.1%, 1%, 10% ink) showed good histology image, however, groups (20%, 50%, 100% ink) showed too much carbon aggregation to disturb the observation. There were no difference in blood routine and pathologic change between these two groups. Conclusions: Chinese ink of concentration 1% to 10% is a useful dye of SLNB according chromaticity, histological observation and security. This dye had latency clinical value and was a new type of the dye for SLNB. No significant financial relationships to disclose.
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Affiliation(s)
- S. Wang
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - K. Xu
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - X. Liu
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Q. Zhou
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Q. Geng
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Q. Geng
- First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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Geng Q, Holmér I, Hartog DEA, Havenith G, Jay O, Malchaire J, Piette A, Rintamäki H, Rissanen S. Temperature Limit Values For Touching Cold Surfaces with the Fingertip. ACTA ACUST UNITED AC 2006; 50:851-62. [PMID: 16777911 DOI: 10.1093/annhyg/mel030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES At the request of the European Commission and in the framework of the European Machinery Directive, research was performed in five different laboratories to develop specifications for surface temperature limit values for the short-term accidental touching of the fingertip with cold surfaces. METHODS Data were collected in four laboratories with a total of 20 males and 20 females performing a grand total of 1655 exposures. Each touched polished blocks of aluminium, stainless steel, nylon-6 and wood using the distal phalanx of the index finger with a contact force of 1.0, 2.9 and 9.8 N, at surface temperatures from +2 to -40 degrees C for a maximum duration of 120 s. Conditions were selected in order to elicit varying rates of skin cooling upon contact. Contact temperature (TC) of the fingertip was measured over time using a T-type thermocouple. RESULTS A database obtained from the experiments was collated and analysed to characterize fingertip contact cooling across a range of materials and surface temperatures. The database was subsequently used to develop a predictive model to describe the contact duration required for skin contact temperature to reach the physiological criteria of onset of pain (15 degrees C), onset of numbness (7 degrees C) and onset of frostbite risk (0 degrees C). CONCLUSIONS The data reflect the strong link between the risk of skin damage and the thermal properties of the material touched. For aluminium and steel, skin temperatures of 0 degrees C occurs within 2-6 s at surface temperatures of -15 degrees C. For non-metallic surfaces, onset of numbness occurs within 15-65 s of contact at -35 degrees C and onset of cold pain occurs within 5 s of contact at -20 degrees C. The predictive model subsequently developed was a non-linear exponential expression also reflecting the effects of material thermal properties and initial temperature. This model provides information for the protection of workers against the risk of cold injury by establishing the temperature limits of cold touchable surfaces for a broad range of materials, and it is now proposed as guidance values in a new international standard.
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Affiliation(s)
- Q Geng
- Swedish Institute of Agricultural and Environmental Engineering Box 7033, SE-750 07 Uppsala, Sweden.
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Wang S, Liu X, Fan P, Geng Q. Study on sentinel lymphatic channels by using methylene blue in breast cancer patients. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- S. Wang
- The First Affiliated Hosp of Nanjing Medcl U, Nanjing, China
| | - X. Liu
- The First Affiliated Hosp of Nanjing Medcl U, Nanjing, China
| | - P. Fan
- The First Affiliated Hosp of Nanjing Medcl U, Nanjing, China
| | - Q. Geng
- The First Affiliated Hosp of Nanjing Medcl U, Nanjing, China
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Malchaire J, Geng Q, Den Hartog E, Havenith G, Holmer I, Piette A, Powell SL, Rintamäki H, Rissanen S. Temperature limit values for gripping cold surfaces. Ann Occup Hyg 2002; 46:157-63. [PMID: 12074025 DOI: 10.1093/annhyg/mef032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES At the request of the European Commission and in the framework of the European Machinery Directive, research was conducted jointly in five different laboratories to develop specifications for surface temperature limit values for the gripping and handling of cold items. METHODS Four hundred and fourteen experiments were run where male and female subjects were invited to grip for up to 20 min cold bars of different contact coefficients, i.e. polished wood, nylon, stone, steel and aluminium. The air temperature and the bars' initial surface temperatures ranged between 0 and -30 degrees C for the various experiments. While gripping the bars, either only the hand or the whole body was exposed to cold. RESULTS The data were used to develop a prediction formula and a graph of the surface temperature limit values in order for the skin contact temperature not to reach <15 degrees C. This duration is shown to offer a significant degree of safety with respect to the minimal surface temperature spontaneously tolerated by the subjects. CONCLUSIONS Experiments and modelling must be pursued to extend these data to other conditions of exposure.
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Affiliation(s)
- J Malchaire
- Université catholique de Louvain, Brussels, Belgium.
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Gao S, Geng Q, Cheng B. [Mature time demarcation of human immature myocardium]. Zhonghua Yi Xue Za Zhi 2000; 80:738-40. [PMID: 11372367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
OBJECTIVE To study the mature time demarcation of human immature myocardium. METHODS The morpho-ultrastructure, calcium metabolism, energy metabolism and oxygen free radicals metabolism of myocardium of children with ventricular septal defect without pulmonary hypertension or any clinical symptoms were studied at different ages. RESULTS The immature myocardium possessed its own structure and functional characteristics. Before viripotent period, the age-related myocardial changes developed progressively to mature and almost approached to mature levels at 6-9 years old. The indices of immature myocardium developing to mature levels were inconsistent. CONCLUSION The structure and function of human immature myocardium approaches to mature levels at 6-9 years old.
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Affiliation(s)
- S Gao
- Department of Thoracic and Cardiovascular Surgery, First Affiliated Hospital of Hubei Medical University, Wuhan 430060, China
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Abstract
In this study, tactile sensitivity of gloved hand in the cold operation has been investigated. The relations among physical properties of protective gloves and hand tactile sensitivity and cold protection were also analysed both objectively and subjectively. Subjects with various gloves participated in the experimental study during cold exposure at different ambient temperatures of -12 degrees C and -25 degrees C. Tactual performance was measured using an identification task with various sizes of objects over the percentage of misjudgment. Forearm, hand and finger skin temperatures were also recorded throughout. The experimental data were analysed using analysis of variance (ANOVA) model and the Tukey's multiple range test. The results obtained indicated that the tactual performance was affected both by gloves and by hands/fingers cooling. Effect of object size on the tactile discrimination was significant and the misjudgment increased when similar sizes of objects were identified, especially at -25 degrees C.
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Affiliation(s)
- Q Geng
- Department of Human Work Science, Luleå University of Technology, Sweden
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Abstract
A new system for measuring three-dimensional deformation has been developed. The main components of the system are a fixed TV camera and vertically scanning projectors. The advantages of the system are: (1) since there is no mechanical contact between the object and the sensing unit, hardness and form of the object do not have to be considered; (2) the system does not need any precise geometry except for the reproducibility of the vertical scanning stage; (3) the time required for one measurements is extremely short; and (4) the system is not expensive. From the basic experiments for testing accuracy, this system has about +/- 30 microns range deviation against 1000 microns deformation of the object. The system has been applied to investigate the influence of various impression procedures for a removable partial denture on the displacement of the simulated soft mucosal tissue. It is revealed that deformation forms are expressed precisely. Our results suggest that this measurement system is quite useful for research in dentistry and that it could be widely applied.
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Affiliation(s)
- S Yamashita
- First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan
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Geng Q, Douglas E. Training of trainers. China Popul Today 1995; 12:18. [PMID: 12290267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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Jiang Y, Geng Q, Haffey J, Douglas E. Improving the quality of care in Chinese family planning programme. China Popul Today 1994; 11:5-8. [PMID: 12319288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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Geng Q. [Influence of various impression procedures for removable partial denture on displacement of soft mucosal tissue]. Kokubyo Gakkai Zasshi 1993; 60:35-53. [PMID: 8482909] [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: 01/31/2023]
Abstract
In the impression-taking procedure for the distal extension removable partial denture, the pressure produced at the interface of the soft mucosal tissue and the impression material is the most important factor for the stability of the saddle under functional load. However, a review of the literature revealed little information about the displacement of the soft tissue caused by the impression pressure. In the present study, to investigate the influence of various impression procedures on the magnitude of the soft tissue displacement more precisely, a new three-dimensional deformation measurement system was devised. Compared to the previous studies, the greatest advantage of the system is that the hardened impression material can be surveyed directly without substituting a dental stone. It was found that, in the investigation using a partially edentulous simulated model, the amount of the subsidence in the soft tissue was increased as the thickness of the spacer of the impression tray was reduced or the seating speed of the tray was fast. Especially in the buccal area, a large amount of vertical displacement was present compared to the midridge and lingual area. Thus it was suggested that many factors are associated with the form of soft tissue under impression loading.
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Affiliation(s)
- Q Geng
- First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University
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