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Wang M, Feng N, Qin J, Wang S, Chen J, Qian S, Liu Y, Luo F. Abdominal surgery under ketamine anesthesia during second trimester impairs hippocampal learning and memory of offspring by regulating dendrite spine remodeling in rats. Neurotoxicology 2024; 101:82-92. [PMID: 38346645 DOI: 10.1016/j.neuro.2024.02.003] [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: 12/01/2023] [Revised: 02/01/2024] [Accepted: 02/07/2024] [Indexed: 02/23/2024]
Abstract
Recent evidence showed that general anesthesia produces long-term neurotoxicity and cognitive dysfunction. However, it remains unclear whether maternal non-obstetric surgery under ketamine anesthesia during second trimester causes cognitive impairment in offspring. The present study assigned pregnant rats into three groups: 1) normal control group receiving no anesthesia and no surgery, 2) ketamine group receiving ketamine anesthesia for 2 h on the 14th day of gestation but no surgery, and 3) surgery group receiving abdominal surgery under ketamine anesthesia on the 14th day of gestation. On postnatal day 1, the offspring rats in Ketamine group and surgery group were assigned to receive intra-peritoneal injection of Senegenin (15 mg/kg), once per day for consecutive 14 days. The offspring's spatial perception, anxiety-like behavior, and learning and memory were evaluated. Then the offspring's hippocampal tissues were collected. The offspring of the surgery group were impaired in the spatial perception in the cliff avoidance test and the spatial learning and memory in the Morris water maze test. Accordingly, the activity of histone deacetylases increased, the protein levels of NEDD9, BDNF, p-TrkB, Syn and PSD-95 decreased, and the density of dendritic spines reduced in the hippocampus of the offspring of the surgery group, and such effects were not seen in the offspring of the ketamine group, neither in the offspring of control group. Senegenin alleviated the learning and memory impairment, and increased the protein levels of NEDD9, BDNF, p-TrkB, Syn and PSD-95 and the density of dendritic spines in the offspring of the surgery group. ketamine anesthesia plus surgery during second trimester impairs hippocampus-dependent learning and memory, and the deficits could be rescued by treatment with Senegenin.
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Affiliation(s)
- Mengdie Wang
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, China
| | - Namin Feng
- Department of Anesthesiology, the First Affiliated Hospital, Xi'an Jiaotong University, Xi'an 710061, China
| | - Jia Qin
- Rehabilitation Medical Center and Department of Anesthesiology, Zhejiang Provincial People's Hospital and Hangzhou Medical College Affiliated People's Hospital, Hangzhou, Zhejiang 310000, China
| | - Shengqiang Wang
- Department of Anesthesiology, Yichun People's Hospital, Yichun 336000, China
| | - Jiabao Chen
- Rehabilitation Medical Center and Department of Anesthesiology, Zhejiang Provincial People's Hospital and Hangzhou Medical College Affiliated People's Hospital, Hangzhou, Zhejiang 310000, China
| | - Shaojie Qian
- Rehabilitation Medical Center and Department of Anesthesiology, Zhejiang Provincial People's Hospital and Hangzhou Medical College Affiliated People's Hospital, Hangzhou, Zhejiang 310000, China
| | - Yulin Liu
- Department of Immunology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
| | - Foquan Luo
- Rehabilitation Medical Center and Department of Anesthesiology, Zhejiang Provincial People's Hospital and Hangzhou Medical College Affiliated People's Hospital, Hangzhou, Zhejiang 310000, China.
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Zhao P, Zhang J, Kuai J, Li L, Li X, Feng N, Du H, Li C, Wang Q, Deng B. TAT-PEP Alleviated Cognitive Impairment by Alleviating Neuronal Mitochondria Damage and Apoptosis After Cerebral Ischemic Reperfusion Injury. Mol Neurobiol 2023; 60:5655-5671. [PMID: 37335462 PMCID: PMC10471703 DOI: 10.1007/s12035-023-03404-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 05/27/2023] [Indexed: 06/21/2023]
Abstract
Paired immunoglobulin-like receptor B (PirB) was identified as a myelin-associated inhibitory protein (MAIP) receptor that plays a critical role in axonal regeneration, synaptic plasticity and neuronal survival after stroke. In our previous study, a transactivator of transcription-PirB extracellular peptide (TAT-PEP) was generated that can block the interactions between MAIs and PirB. We found that TAT-PEP treatment improved axonal regeneration, CST projection and long-term neurobehavioural recovery after stroke through its effects on PirB-mediated downstream signalling. However, the effect of TAT-PEP on the recovery of cognitive function and the survival of neurons also needs to be investigated. In this study, we investigated whether pirb RNAi could alleviate neuronal injury by inhibiting the expression of PirB following exposure to oxygen-glucose deprivation (OGD) in vitro. In addition, TAT-PEP treatment attenuated the volume of the brain infarct and promoted the recovery of neurobehavioural function and cognitive function. This study also found that TAT-PEP exerts neuroprotection by reducing neuronal degeneration and apoptosis after ischemia-reperfusion injury. In addition, TAT-PEP improved neuron survival and reduced lactate dehydrogenase (LDH) release in vitro. Results also showed that TAT-PEP reduced malondialdehyde (MDA) levels, increased superoxide dismutase (SOD) activity and reduced reactive oxygen species (ROS) accumulation in OGD-injured neurons. The possible mechanism was that TAT-PEP could contribute to the damage of neuronal mitochondria and affect the expression of cleaved caspase 3, Bax and Bcl-2. Our results suggest that PirB overexpression in neurons after ischaemic-reperfusion injury induces neuronal mitochondrial damage, oxidative stress and apoptosis. This study also suggests that TAT-PEP may be a potent neuroprotectant with therapeutic potential for stroke by reducing neuronal oxidative stress, mitochondrial damage, degeneration and apoptosis in ischemic stroke.
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Affiliation(s)
- Pin Zhao
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
- Department of Anesthesiology, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Xi'an, Shaanxi, 710018, People's Republic of China
| | - Jiapo Zhang
- Department of Emergency Medicine, School of Medicine, Xiang'an Hospital of Xiamen University, Xiamen University, Xiamen, 361102, Fujian, China
| | - JianKe Kuai
- Department of Anesthesiology, Xi'an No.3 Hospital, The Affiliated Hospital of Northwest University, Xi'an, Shaanxi, 710018, People's Republic of China
| | - Liya Li
- Department of Anesthesiology, The Second Affiliated Hospital of Dalian Medical University, Dalian, 116027, Liaoning, China
| | - Xuying Li
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Namin Feng
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Hailiang Du
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Chen Li
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Qiang Wang
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China.
| | - Bin Deng
- Department of Anesthesiology & Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China.
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Feng N, Wang RL, Gao QH, Ye TY, Ye CC. [Periodontal symptoms and treatment of three patients with Sturge-Weber syndrome]. Zhonghua Kou Qiang Yi Xue Za Zhi 2023; 58:471-474. [PMID: 37082853 DOI: 10.3760/cma.j.cn112144-20220912-00484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Affiliation(s)
- N Feng
- Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
| | - R L Wang
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Q H Gao
- Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
| | - T Y Ye
- Department of Periodontology, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
| | - C C Ye
- Department of Periodontology, West China Hospital of Stomatology, Sichuan University & State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Chengdu 610041, China
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Li X, Yin D, Fan M, Yang Y, Liang L, Feng N, Li X, Guo F. [IRE1 α deficiency impairs autophagy in chondrocytes by upregulating calcium homeostasis endoplasmic reticulum protein]. Nan Fang Yi Ke Da Xue Xue Bao 2022; 42:785-793. [PMID: 35790428 DOI: 10.12122/j.issn.1673-4254.2022.06.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To explore the mechanism by which inositol-requiring enzyme-1α (IRE1α) regulates autophagy function of chondrocytes through calcium homeostasis endoplasmic reticulum protein (CHERP). METHODS Cultured human chondrocytes (C28/I2 cells) were treated with tunicamycin, 4μ8c, rapamycin, or both 4μ8c and rapamycin, and the expressions of endoplasmic reticulum (ER) stress- and autophagy-related proteins were detected with Western blotting. Primary chondrocytes from ERN1 knockout (ERN1 CKO) mice and wild-type mice were examined for ATG5 and ATG7 mRNA expressions, IRE1α and p-IRE1α protein expressions, and intracellular calcium ion content using qPCR, Western blotting and flow cytometry. The effect of bafilomycin A1 treatment on LC3 Ⅱ/LC3 Ⅰ ratio in the isolated chondrocytes was assessed with Western blotting. Changes in autophagic flux of the chondrocytes in response to rapamycin treatment were detected using autophagy dual fluorescent virus. The changes in autophagy level in C28/I2 cells overexpressing CHERP and IRE1α were detected using immunofluorescence assay. RESULTS Tunicamycin treatment significantly up-regulated ER stress-related proteins and LC3 Ⅱ/LC3 Ⅰ ratio and down-regulated the expression of p62 in C28/I2 cells (P < 0.05). Rapamycin obviously up-regulated LC3 Ⅱ/LC3 Ⅰ ratio (P < 0.001) in C28/I2 cells, but this effect was significantly attenuated by co-treatment with 4μ8c (P < 0.05). Compared with the cells from the wild-type mice, the primary chondrocytes from ERN1 knockout mice showed significantly down-regulated mRNA levels of ERN1 (P < 0.01), ATG5 (P < 0.001) and ATG7 (P < 0.001), lowered or even lost expressions of IRE1α and p-IRE1α proteins (PP < 0.01), and increased expression of CHERP (P < 0.05) and intracellular calcium ion content (P < 0.001). Bafilomycin A1 treatment obviously increased LC3 Ⅱ/ LC3 Ⅰ ratio in the chondrocytes from both wild-type and ERN1 knockout mice (P < 0.01 or 0.05), but the increment was more obvious in the wild-type chondrocytes (P < 0.05). Treatment with autophagy dual-fluorescence virus resulted in a significantly greater fluorescence intensity of LC3-GFP in rapamycin-treated ERN1 CKO chondrocytes than in wild-type chondrocytes (P < 0.05). In C28/I2 cells, overexpression of CHERP obviously decreased the fluorescence intensity of LC3, and overexpression of IRE1α enhanced the fluorescence intensity and partially rescued the fluorescence reduction of LC3 caused by CHERP. CONCLUSION IRE1α deficiency impairs autophagy in chondrocytes by upregulating CHERP and increasing intracellular calcium ion content.
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Affiliation(s)
- X Li
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - D Yin
- Department of Pathology, Beijing Friendship Hospital Affiliated to Capital Medical University, Beijing 100011, China
| | - M Fan
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - Y Yang
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - L Liang
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - N Feng
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - X Li
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
| | - F Guo
- Department of Cell Biology and Genetics, Chongqing Medical University, Chongqing 400016, China
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Jiang YR, Niu LL, Feng N, Fan HL, Jin QQ, Du QX, Cao J, Wang YY, Sun JH. Correlation between the Polymorphism of Coagulation-Related Genes and Lower Extremity Deep Venous Thrombosis. Fa Yi Xue Za Zhi 2021; 37:145-150. [PMID: 34142473 DOI: 10.12116/j.issn.1004-5619.2019.491213] [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] [Received: 12/18/2019] [Indexed: 11/30/2022]
Abstract
Abstract Objective To investigate the correlation between the polymorphism of 4 coagulation-related genes, rs1799963 (coagulation factor V gene Leiden), rs6025 (prothrombin gene G20210A), rs1042579 (thrombomodulin protein gene c.1418C>T) and rs1801131 (methylenetetrahydroflate reductase gene) and lower extremity deep venous thrombosis (LEDVT). Methods The 4 genotypes mentioned above of 150 LEDVT patients and 153 healthy controls were detected by the kompetitive allele specific polymerase chain reaction (KASP), then related blood biochemical indicators were collected, binary Logistic regression was established to screen the independent risk factors of LEDVT, and the correlation between polymorphism of 4 coagulation-related genes and LEDVT and its indicators under different genetic modes after adjusting confounding factors were analyzed. Results Five variables, D-dimer, fibrinogen degradation product, homocysteine, sex and age might be the risk factors of LEDVT. These variables were put into 4 genetic inheritance models, and adjusted in binary Logistic regression. The results suggested that the mutations of rs1042579 were correlated with LEDVT under dominant inheritance mode. Conclusion The gene polymorphism of rs1799963, rs6025 and rs1801131 has no significant correlation with the formation of LEDVT. The gene polymorphism of rs1042579 plays a role under dominant inheritance mode, and might be an independent risk factor for formation of LEDVT.
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Affiliation(s)
- Y R Jiang
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - L L Niu
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - N Feng
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - H L Fan
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China.,School of Basic Medicine and Life Science, Hainan Medical University, Haikou 571199, China
| | - Q Q Jin
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - Q X Du
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - J Cao
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - Y Y Wang
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
| | - J H Sun
- School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China
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Feng N, Li X, Shang L, Xu M. [Two cases of occupational frostbite]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 37:937-939. [PMID: 31937039 DOI: 10.3760/cma.j.issn.1001-9391.2019.12.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The diagnosis, treatment, operation and diagnosis of two cases of occupational frostbite diagnosed in Shandong Academy of Occupational Healthy Occupational Medicine were analyzed retrospectively. In these two patients working in a low temperature environment, the finger frostbite did not arouse enough attention, one patient did not receive timely diagnosis and treatment, and one patient received timely medical treatment, but did not receive proper treatment, which ultimately led to the adverse consequences of finger amputation. The staff under the low temperature environment should strictly carry out the low temperature operation protection standard and improve their self-protection consciousness. If frostbite occurs, they should seek medical treatment in time, which can effectively reduce the disability rate.
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Affiliation(s)
- N Feng
- Shandong Academy of Occupational Healthy Occupational Medicine, Shandong First Medical University &Shandong Academy of Medical Sciences, Jinan250002, China
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Wang K, Wang H, Feng N, Wang H, Zhao Y, Gao Y, Hu G, Xia X. Serological surveillance of avian influenza virus and canine distemper virus in captive Siberian Tigers in Northeastern China. Pol J Vet Sci 2019; 21:491-495. [PMID: 30468333 DOI: 10.24425/122621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In order to understand infection of avian influenza A virus (AIV) and canine distemper virus (CDV) in the Siberian Tiger in Northeast China, 75 Siberian Tiger serum samples from three cap- tive facilities in northeastern China were collected. AIV and CDV antibody surveillance was test- ed by using hemagglutination inhibition and serum neutralization methods. The results showed that the seroprevalence of H5 AIV, H9 AIV and CDV was respectively 9.33% (7/75), 61.33% (46/75) and 16% (12/75). In the 1⟨years ⟨2 and > 5 year-old group, the seroprevalence of the H9 AIV was 24% and 80% (P ⟨ 0.01), and the CDV seroprevalence was 6% and 36% (P ⟨ 0.01), respectively. It was demonstrated that 3 (4%) out of 75 serum samples were AIV+CDV seropos- itive, with 2.67% (2/75) in H9+AIV and 1.33% (1/75) in H5+H9+AIV. To our knowledge, this is the first report of AIV and CDV seroprevalence in Siberian Tigers in China, which will provide base-line data for the control of AIV and CDV infection in Siberian Tigers in China.
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Affiliation(s)
- K Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P. R. China
| | - H Wang
- Wildlife ambulance breeding center of Jilin province, Changchun, Jilin, P. R. China
| | - N Feng
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Military Veterinary Research Institute of Academy of the Military Medical Sciences, Changchun 130122, P. R. China
| | - H Wang
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Military Veterinary Research Institute of Academy of the Military Medical Sciences, Changchun 130122, P. R. China
| | - Y Zhao
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Military Veterinary Research Institute of Academy of the Military Medical Sciences, Changchun 130122, P. R. China
| | - Y Gao
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Military Veterinary Research Institute of Academy of the Military Medical Sciences, Changchun 130122, P. R. China
| | - G Hu
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P. R. China
| | - X Xia
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P. R. China.,Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Military Veterinary Research Institute of Academy of the Military Medical Sciences, Changchun 130122, P. R. China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, P. R. China
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He H, Yao G, Ma Y, Feng N, Zhou S, Huang Q. Experimental and Theoretical Study of the Raman Spectra of Ganoderic Acid T. J STRUCT CHEM+ 2019. [DOI: 10.1134/s0022476619090051] [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: 11/23/2022]
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Li HX, Zheng JF, Huang GW, Xiao J, Wang H, Yang M, Feng N. [Prevalence and associated risk factors on preterm birth, low birth weight, and small for gestational age among HIV-infected pregnant women in Hunan province, 2011-2017]. Zhonghua Liu Xing Bing Xue Za Zhi 2019; 39:1368-1374. [PMID: 30453439 DOI: 10.3760/cma.j.issn.0254-6450.2018.10.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To describe the prevalence of preterm birth (PB), low birth weight (LBW), and small for gestational age (SGA) among HIV-infected pregnant women and to identify associated risk factors in Hunan province. Methods: This study appeared a retrospective one on HIV-infected pregnant women retrieved from Information System of Prevention of Mother-to-child Transmission of HIV management in Hunan province, between January 2011 and December 2017. Information regarding demographic characteristics, pregnancy, antiretroviral therapy (ART), husbands/partners' relevant situation and pregnancy outcomes, among these HIV-infected pregnant women were collected and analyzed. The incidence rates on PB, LBW and SGA were calculated. Multivariate logistic regression was used to analyze the associated risk factors. Results: A total of 780 HIV-infected pregnant women were enrolled. The prevalence rates on PB, LBW and SGA in HIV- infected pregnant women appeared as 7.9% (62/780), 9.9% (77/780) and 21.3% (166/780), respectively. Results from the multivariate logistic regression analysis showed that factors as pregnancy related diseases as moderate/severe anemia, hypertensive, initial time of ART <14 gestational weeks (compared to those women without ART during pregnancy) and husbands/partners' age >35 years old (compared to husbands/partners' age 26-30 years old) etc., were associated with an increased risk of PB with adjusted OR as 4.59 (95%CI: 1.51-13.95), 4.90 (95%CI: 1.56-15.46), 2.40 (95%CI: 1.26- 4.56) and 2.29 (95%CI: 1.21-4.36). For LBW, pregnancy moderate/severe anemia, pregnancy HBV infection and initial time of ART <14 gestational weeks were associated with an increased risk of LBW, with adjusted OR as 3.28 (95%CI: 1.13-9.54), 4.37 (95%CI: 1.42-13.44) and 2.68 (95%CI: 1.51-4.76), respectively. For SGA, pregnancy HBV infection and initial time of ART <14 gestational weeks were risk factors for SGA, with adjusted OR as 4.41 (95%CI: 1.43-13.63) and 2.67 (95%CI: 1.51-4.73), respectively. Conclusion: Preterm birth, LBW and SGA were common adverse pregnancy outcomes for HIV-infected pregnant women and were associated with factors as pregnancy complications, ART and husbands/partners' age.
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Affiliation(s)
- H X Li
- Department of Child Health Care, Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, China
| | - J F Zheng
- Department of Emergency Medicine, Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - G W Huang
- Department of Child Health Care, Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, China
| | - J Xiao
- Department of Child Health Care, Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, China
| | - H Wang
- Department of Maternal Health, Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, China
| | - M Yang
- Department of Maternal Health, Hunan Provincial Maternal and Child Health Care Hospital, Changsha 410008, China
| | - N Feng
- Department of Health Care, Shenzhen Nanshan Maternal and Child Health Care Hospital, Shenzhen 518067, China
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Yu Q, Feng N, Hu Y, Luo F, Zhao W, Zhao W, Liu Z, Li M, Xu L, Wu L, Liu Y. Suberoylanilide hydroxamic acid (SAHA) alleviates the learning and memory impairment in rat offspring caused by maternal sevoflurane exposure during late gestation. J Toxicol Sci 2019; 44:177-189. [PMID: 30842370 DOI: 10.2131/jts.44.177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Recent studies have shown that sevoflurane can cause long-term neurotoxicity and learning and memory impairment in developing and progressively neurodegenerative brains. Sevoflurane is a widely used volatile anesthetic in clinical practice. Late gestation is a rapidly developing period in the fetal brain, but whether sevoflurane anesthesia during late gestation affects learning and memory of offspring is not fully elucidated. Histone deacetylase 2 (HDAC2) plays an important regulatory role in learning and memory. This study examined the effect of maternal sevoflurane exposure on learning and memory in offspring and the underlying role of HDAC2. The Morris water maze (MWM) test was used to evaluate learning and memory function. Q-PCR and immunofluorescence staining were used to measure the expression levels of genes related to learning and memory. The results showed that sevoflurane anesthesia during late gestation impaired learning and memory in offspring rats (e.g., showing increase of the escape latency and decrease of the platform-crossing times and target quadrant traveling time in behavior tests) and upregulated the expression of HDAC2, while downregulating the expression of the cyclic adenosine monophosphate (cAMP) response element binding protein (CREB) and the N-methyl-D-aspartate receptor 2 subunit B (NR2B) mRNA and protein in the hippocampus of offspring in a time-dependent manner. HDAC2 inhibitor suberoylanilide hydroxamic acid (SAHA) treatment alleviated all of these changes in offspring rats. Therefore, the present study indicates that sevoflurane exposure during late gestation impairs offspring rat's learning and memory via upregulation of the expression of HDAC2 and downregulation of the expression of CREB and NR2B. SAHA can alleviate these impairments.
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Affiliation(s)
- Qi Yu
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Namin Feng
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Yan Hu
- Department of Anesthesiology, Jiangxi Province Traditional Chinese Medicine Hospital, China
| | - Foquan Luo
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Weihong Zhao
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Weilu Zhao
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Zhiyi Liu
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Mengyuan Li
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Lin Xu
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, China
| | - Liuqing Wu
- Department of Anesthesiology, Jiangxi Province Tumor Hospital, China
| | - Yulin Liu
- Department of Immunology, Jiangxi Medical College, Nanchang University, China
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Lv J, Liu F, Feng N, Sun X, Tang J, Xie L, Wang Y. CYP3A4 gene polymorphism is correlated with individual consumption of sufentanil. Acta Anaesthesiol Scand 2018; 62:1367-1373. [PMID: 29926893 DOI: 10.1111/aas.13178] [Citation(s) in RCA: 12] [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: 09/06/2017] [Revised: 05/04/2018] [Accepted: 05/11/2018] [Indexed: 11/30/2022]
Abstract
BACKGROUND Pain is one of the major adverse clinical outcomes of cesarean section (CS). In the past few years, researchers and physicians have been optimizing post-operative analgesic modalities, but the results are still undesirable for the parturient. The cytochrome P-450 3A4 (CYP3A4) gene has been reported to contribute significantly to human liver microsomal oxidation of sufentanil and alfentanil. METHODS We detected the frequency of CYP3A4 mutant allele, which is associated with the metabolism of diverse drugs, including opioids used for anesthesia. We then investigated the correlation between sufentanil (an opioid analgesic) consumption and CYP3A4 genetic polymorphism. RESULTS We found the frequency of the CYP3A4∗1G (the mutant form of CYP3A) variant allele to be 0.279 in 71 parturients undergoing cesarean section and 137 age-matched parturients with vaginal delivery. Interestingly, the parturients with homozygous CYP3A4∗1G showed less sufentanil consumption compared with those having the wild-type genotype. CONCLUSION In summary, we found a correlation between CYP3A4 genetic polymorphism and sufentanil consumption. This might be helpful for optimizing the anesthesia strategies and reducing their side effects.
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Affiliation(s)
- J. Lv
- Department of Anesthesiology Qianfoshan Hospital Affiliated to Medical College of Shandong University Jinan China
- Department of Anesthesiology Zibo Center Hospital Zibo China
| | - F. Liu
- Linyi People's Hospital Linyi China
| | - N. Feng
- Department of Anesthesiology Zibo Center Hospital Zibo China
| | - X. Sun
- Department of Anesthesiology Zibo Center Hospital Zibo China
| | - J. Tang
- Department of Anesthesiology Zibo Center Hospital Zibo China
| | - L. Xie
- Department of Anesthesiology Zibo Center Hospital Zibo China
| | - Y. Wang
- Department of Anesthesiology Qianfoshan Hospital Affiliated to Medical College of Shandong University Jinan China
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Lee MR, Sheskier MB, Farokhnia M, Feng N, Marenco S, Lipska BK, Leggio L. Oxytocin receptor mRNA expression in dorsolateral prefrontal cortex in major psychiatric disorders: A human post-mortem study. Psychoneuroendocrinology 2018; 96:143-147. [PMID: 29940428 DOI: 10.1016/j.psyneuen.2018.05.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/08/2018] [Accepted: 05/29/2018] [Indexed: 01/29/2023]
Abstract
There is growing interest in oxytocin as a putative treatment for various psychiatric disorders including major depressive disorder, bipolar disorder and schizophrenia/schizoaffective disorder. However, potential alterations in the endogenous brain oxytocin system in these disorders are poorly characterized. Brain expression of oxytocin and its receptor genes in patients with these psychiatric disorders has not been well studied outside the hypothalamus. We measured expression of mRNA for oxytocin and its receptor in the dorsolateral prefrontal cortex of postmortem brains using quantitative polymerase chain reaction in a total of 581 individuals. These individuals either were diagnosed with major depressive disorder (n = 135), bipolar disorder (n = 57), schizophrenia/schizoaffective disorder (n = 169), or were control subjects, defined as individuals with no lifetime history of any of these disorders (n = 220). Diagnoses of major depressive disorder and bipolar disorder were associated with significantly increased oxytocin receptor mRNA levels in the dorsolateral prefrontal cortex. This finding is discussed in light of the extant literature on the dysregulation of oxytocin signaling in individuals with major psychiatric disorders.
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Affiliation(s)
- M R Lee
- Section on Clinical Psychoneuroendocrinology and Neuropsychopharmacology, National Institute on Alcohol Abuse and Alcoholism Division of Intramural Clinical and Basic Research and National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Bethesda, MD, USA.
| | - M B Sheskier
- Section on Clinical Psychoneuroendocrinology and Neuropsychopharmacology, National Institute on Alcohol Abuse and Alcoholism Division of Intramural Clinical and Basic Research and National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Bethesda, MD, USA
| | - M Farokhnia
- Section on Clinical Psychoneuroendocrinology and Neuropsychopharmacology, National Institute on Alcohol Abuse and Alcoholism Division of Intramural Clinical and Basic Research and National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Bethesda, MD, USA
| | - N Feng
- Human Brain Collection Core, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA
| | - S Marenco
- Human Brain Collection Core, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA
| | - B K Lipska
- Human Brain Collection Core, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA
| | - L Leggio
- Section on Clinical Psychoneuroendocrinology and Neuropsychopharmacology, National Institute on Alcohol Abuse and Alcoholism Division of Intramural Clinical and Basic Research and National Institute on Drug Abuse Intramural Research Program, National Institutes of Health, Bethesda, MD, USA; Center for Alcohol and Addiction Studies, Department of Behavioral and Social Sciences, Brown University, Providence, RI, USA
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Lin J, Wang S, Feng Y, Zhao W, Zhao W, Luo F, Feng N. Propofol exposure during early gestation impairs learning and memory in rat offspring by inhibiting the acetylation of histone. J Cell Mol Med 2018; 22:2600-2611. [PMID: 29461008 PMCID: PMC5908131 DOI: 10.1111/jcmm.13524] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 12/12/2017] [Indexed: 12/22/2022] Open
Abstract
Propofol is widely used in clinical practice, including non-obstetric surgery in pregnant women. Previously, we found that propofol anaesthesia in maternal rats during the third trimester (E18) caused learning and memory impairment to the offspring rats, but how about the exposure during early pregnancy and the underlying mechanisms? Histone acetylation plays an important role in synaptic plasticity. In this study, propofol was administered to the pregnant rats in the early pregnancy (E7). The learning and memory function of the offspring were tested by Morris water maze (MWM) test on post-natal day 30. Two hours before each MWM trial, histone deacetylase 2 (HDAC2) inhibitor, suberoylanilide hydroxamic acid (SAHA), Senegenin (SEN, traditional Chinese medicine), hippyragranin (HGN) antisense oligonucleotide (HGNA) or vehicle were given to the offspring. The protein levels of HDAC2, acetylated histone 3 (H3) and 4 (H4), cyclic adenosine monophosphate (cAMP) response element-binding protein (CREB), N-methyl-D-aspartate receptor (NMDAR) 2 subunit B (NR2B), HGN and synaptophysin in offspring's hippocampus were determined by Western blot or immunofluorescence test. It was discovered that infusion with propofol in maternal rats on E7 leads to impairment of learning and memory in offspring, increased the protein levels of HDAC2 and HGN, decreased the levels of acetylated H3 and H4 and phosphorylated CREB, NR2B and synaptophysin. HDAC2 inhibitor SAHA, Senegenin or HGN antisense oligonucleotide reversed all the changes. Thus, present results indicate exposure to propofol during the early gestation impairs offspring's learning and memory via inhibiting histone acetylation. SAHA, Senegenin and HGN antisense oligonucleotide might have therapeutic value for the adverse effect of propofol.
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Affiliation(s)
- Jiamei Lin
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China.,Department of Anesthesiology, the Eastern Hospital of the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Shengqiang Wang
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
| | - Yunlin Feng
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
| | - Weihong Zhao
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
| | - Weilu Zhao
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
| | - Foquan Luo
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
| | - Namin Feng
- Department of Anesthesiology, the First Affiliated Hospital, Nanchang University, Nanchang, China
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Fan CL, Luo JY, Gong WJ, Liu XQ, Zhou SJ, Zhang FF, Zeng J, Li HX, Feng N. [Nested case-control study on associated factors for anemia during pregnancy]. Zhonghua Liu Xing Bing Xue Za Zhi 2017; 38:1269-1273. [PMID: 28910945 DOI: 10.3760/cma.j.issn.0254-6450.2017.09.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the related factors of anemia during pregnancy and provide scientific evidence for the primary prevention of anemia during pregnancy. Methods: The pregnant women (≤12 pregnant weeks) who received the first pregnancy care in a local medical institution in Hunan province from June 2013 to November 2014 were included in this cohort study, and for them anemia had been excluded by physical examination. Baseline survey and follow up till childbirth were conducted for them. A queue-based nested case-control study (1 ∶ 2) was conducted (380 pregnant women with anemia detected in this study as case group, 760 pregnant women without anemia randomly selected and matched by age, habitual residence during pregnancy as control group. And t test, χ(2) test and logistic regression analysis were conducted to identify related factors of anemia during pregnancy. Results: Multivariate logistic regression analysis indicated that low family annual income level (net income) (OR=2.08, 95%CI: 1.22-3.59), low educational level (OR=2.09, 95%CI: 1.22-3.59), pre-pregnancy perm/hair dye (OR=2.23, 95%CI: 1.63-3.05), early pregnancy vomiting (OR=2.51, 95%CI: 1.56-4.03) were the risk factors for anemia during pregnancy. Intake of vitamin and trace element supplements (OR=0.69, 95%CI: 0.50-0.94), frequent meat, fish, shrimp, egg intakes (OR=0.68, 95%CI: 0.49-0.92), frequent soy milk, milk intakes (OR=0.51, 95%CI: 0.27-0.95) were the protective factors for anemia during pregnancy. Conclusion: A number of factors, such as family annual income level, education level, poisonous and harmful material contact, pregnancy reaction, nutrition, are related to the incidence of anemia during pregnancy, it is necessary to take preventive measures to reduce the incidence of anemia during pregnancy.
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Affiliation(s)
- C L Fan
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - J Y Luo
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - W J Gong
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - X Q Liu
- Department of Maternal and Child Health, School of Public Health, Central South University, Changsha 410078, China
| | - S J Zhou
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - F F Zhang
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - J Zeng
- Liuyang County Women and Children Health Center, Liuyang 410300, China
| | - H X Li
- Women and Children Health Center of Hunan Province, Changsha 410078, China
| | - N Feng
- Women and Children Health Center of Hunan Province, Changsha 410078, China
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Fang C, Zhu Y, Li L, Feng N, Zhe C, Hu S, Jia H, Yu B. P5562Morphological features of culprit lesions in ST segment elevation myocardial infarction patients with multi-vessel coronary artery disease: an optical coherence tomography study. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5562] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Cai H, Zhu Y, Hu S, Jia H, Li L, Zhao C, Lv Y, Fang C, Feng N, Zhe C, Gao H, Hu Y, Hou J, Zhang S, Yu B. P4636Association of isolated low HDL-C level with morphological features of culprit plaques in patients with ST segment elevation myocardial infarction: an optical coherence tomography study. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4636] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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17
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Zhao W, Hao M, Wang Y, Feng N, Wang Z, Wang W, Wang J, Ding L. Association between folate status and cervical intraepithelial neoplasia. Eur J Clin Nutr 2016; 70:837-42. [PMID: 27026426 PMCID: PMC4940925 DOI: 10.1038/ejcn.2016.35] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [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: 10/01/2015] [Revised: 02/15/2016] [Accepted: 02/17/2016] [Indexed: 12/03/2022]
Abstract
Background/Objectives: To investigate the effect of folate status on cervical intraepithelial neoplasia (CIN) progression and its relationship with high-risk human papillomavirus (hrHPV). Subjects/Methods: We evaluated 20 000 sexually active women aged <65 years in Yangqu County by using a questionnaire; the subjects were also screened using the ThinPrep cytologic test (TCT). Patients with abnormal TCT results (other than glandular cell abnormalities) who were willing to provide informed consent were further diagnosed using colposcopy and histopathological examination. We investigated 247 cases of low-grade cervical squamous intraepithelial lesions (LSIL), 125 cases of high-grade cervical squamous intraepithelial lesions (HSIL) and 877 controls. A 24-item food frequency questionnaire was filled out by the investigator to estimate the consumption of dietary folate. Positivity for hrHPV from residual exfoliated cervical cells was tested; serum folate was also measured. Results: The hrHPV infection rate in HSIL patients (77.6%) was higher than that in LSIL (33.2%) and control (32.0%) patients. Dietary folate intakes in controls, LSIL and HSIL were 306.9±176.6, 321.8±168.0 and 314.7±193.8 μg/kcal, respectively. The levels of serum folate in controls, LSIL and HSIL were 18.2±7.9, 15.9±7.1 and 14.3±7.5 nmol/l, respectively. Increased CIN correlated with higher rates of hrHPV infection and lower levels of serum folate. Conclusions: Low levels of serum folate may increase the risk of CIN progression. Furthermore, potential synergy may exist between low serum folate levels and hrHPV infection to promote CIN development.
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Affiliation(s)
- W Zhao
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - M Hao
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Y Wang
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - N Feng
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Z Wang
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - W Wang
- Department of Obstetrics and Gynecology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - J Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan, China
| | - L Ding
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan, China
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Yin L, Sun D, Mei QC, Gu YD, Baker JS, Feng N. The Kinematics and Kinetics Analysis of the Lower Extremity in the Landing Phase of a Stop-jump Task. Open Biomed Eng J 2015; 9:103-7. [PMID: 25937849 PMCID: PMC4412954 DOI: 10.2174/1874120701509010103] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 12/30/2014] [Accepted: 02/16/2014] [Indexed: 11/24/2022] Open
Abstract
Large number of studies showed that landing with great impact forces may be a risk factor for knee injuries. The purpose of this study was to illustrate the different landing loads to lower extremity of both genders and examine the relationships among selected lower extremity kinematics and kinetics during the landing of a stop-jump task. A total of 35 male and 35 female healthy subjects were recruited in this study. Each subject executed five experiment actions. Lower extremity kinematics and kinetics were synchronously acquired. The comparison of lower extremity kinematics for different genders showed significant difference. The knee and hip maximum flexion angle, peak ground reaction force and peak knee extension moment have significantly decreased during the landing of the stop-jump task among the female subjects. The hip flexion angle at the initial foot contact phase showed significant correlation with peak ground reaction force during landing of the stop-jump task (r=-0.927, p<0.001). The knee flexion angle at the initial foot contact phase had significant correlation with peak ground reaction force and vertical ground reaction forces during landing of the stop-jump task (r=-0.908, p<0.001; r=0.812, P=0.002). A large hip and knee flexion angles at the initial foot contact with the ground did not necessarily reduce the impact force during landing, but active hip and knee flexion motions did. The hip and knee flexion motion of landing was an important technical factor that affects anterior cruciate ligament (ACL) loading during the landing of the stop-jump task.
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Affiliation(s)
- L Yin
- Human Movement Research Center, Faculty of Sports Science, Ningbo University, Zhejiang 315211, China ; School of Science and Sport, University of the West of Scotland, Hamilton, ML3 OJB, Scotland
| | - D Sun
- Human Movement Research Center, Faculty of Sports Science, Ningbo University, Zhejiang 315211, China
| | - Q C Mei
- Human Movement Research Center, Faculty of Sports Science, Ningbo University, Zhejiang 315211, China
| | - Y D Gu
- Human Movement Research Center, Faculty of Sports Science, Ningbo University, Zhejiang 315211, China
| | - J S Baker
- School of Science and Sport, University of the West of Scotland, Hamilton, ML3 OJB, Scotland
| | - N Feng
- Rehabilitation Center, Ningbo Ninth Hospital, Zhejiang 315020, China
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Xue HB, Tan HH, Liu WZ, Chen XY, Feng N, Gao YJ, Song Y, Zhao YJ, Ge ZZ. A pilot study of endoscopic spray cryotherapy by pressurized carbon dioxide gas for Barrett's esophagus. Endoscopy 2011; 43:379-85. [PMID: 21437849 DOI: 10.1055/s-0030-1256334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND STUDY AIMS Endoscopic spray cryoablation is a novel approach for the treatment of Barrett's esophagus. However, few studies have reported its efficacy, especially with the use of carbon dioxide (CO (2)). The aim of the current study was to evaluate the short term efficacy and complications using CO (2) in endoscopic cryoablation of Barrett's esophagus. METHODS Patients diagnosed with Barrett's esophagus underwent monthly stepwise cryoablation with pressurized CO (2) gas, with follow-up esophageal biopsies until complete histological reversal was achieved. Responses were analyzed with an intention-to-treat analysis according to complete response for intestinal metaplasia (CR-IM), which was defined as the elimination of all intestinal metaplasia including specialized intestinal metaplasia (SIM), subsquamous SIM, and dysplasia with intestinal metaplasia in the biopsies under narrow-band imaging (NBI). RESULTS In total, 22 patients were enrolled, 20 of whom completed the treatment. Two patients declined further ablation after the first cryotherapy session. A total of 44 sessions were performed; a median of 2 sessions per patient (range 1 - 3 sessions) were needed to complete the ablation of Barrett's esophagus. No severe complications occurred. Follow-up endoscopies were performed in 20 patients (90.9 %). Two patients (9.1 %) were lost to follow-up. Median follow-up was 10 months (range 6 - 18 months). After cryotherapy, 20 patients (90.9 %) reached CR-IM of Barrett's esophagus. Patients underwent a median number of 3 follow-up endoscopies (range 2 - 4) with biopsies. At 6 months, recurrence was evident in three patients (13.6 % of the overall population, 15.0 % of the CR-IM population). One of the three patients developed intestinal metaplasia but no dysplastic change and the other two developed subsquamous SIM. CONCLUSIONS The pressurized CO (2) spray cryotherapy is a relatively effective and safe endoscopic treatment for Barrett's esophagus.
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Affiliation(s)
- H B Xue
- Department of Gastroenterology, Shanghai Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Institute of Digestive Disease, 145 Shan-dong Zhong Rd., Shanghai, China
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Wang Z, Zhang W, Feng N, Song N, Hua L, Yin C, Wang X. MP-09.06: Molecular Cloning and Characterization of Lactoferrin Receptor (LfR) on Human Spermatozoa. Urology 2009. [DOI: 10.1016/j.urology.2009.07.945] [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: 10/20/2022]
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Mak B, Truong A, Feng N, da Cruz L, Mistry B, Fung S, Perez T, Hahn S, Pereira D, Young D. 543 POSTER Location… location… location: hitting the functional epitope within the target is essential for anti-cancer antibody therapeutics. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)72477-7] [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: 11/25/2022] Open
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Mak B, McConkey F, Feng N, O'Reilly K, Fung S, Wang M, Chau S, Hahn S, Pereira D, Young D. 517 POSTER A monoclonal antibody (AR36A36.11.1) with potent in vivo efficacy in multiple human cancer models targets CD59. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)72451-0] [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: 11/26/2022] Open
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Feng N, Kim B, Fenaux M, Nguyen H, Vo P, Omary MB, Greenberg HB. Role of interferon in homologous and heterologous rotavirus infection in the intestines and extraintestinal organs of suckling mice. J Virol 2008; 82:7578-90. [PMID: 18495762 PMCID: PMC2493311 DOI: 10.1128/jvi.00391-08] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [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: 02/22/2008] [Accepted: 05/12/2008] [Indexed: 02/05/2023] Open
Abstract
Recent studies demonstrated that viremia and extraintestinal rotavirus infection are common in acutely infected humans and animals, while systemic diseases appear to be rare. Intraperitoneal infection of newborn mice with rhesus rotavirus (RRV) results in biliary atresia (BA), and this condition is influenced by the host interferon response. We studied orally inoculated 5-day-old suckling mice that were deficient in interferon (IFN) signaling to evaluate the role of interferon on the outcome of local and systemic infection after enteric inoculation. We found that systemic replication of RRV, but not murine rotavirus strain EC, was greatly enhanced in IFN-alpha/beta and IFN-gamma receptor double-knockout (KO) or STAT1 KO mice but not in mice deficient in B- or T-cell immunity. The enhanced replication of RRV was associated with a lethal hepatitis, pancreatitis, and BA, while no systemic disease was observed in strain EC-infected interferon-deficient mice. In IFN-alpha/beta receptor KO mice the extraintestinal infection and systemic disease were only moderately increased, while RRV infection was not augmented and systemic disease was not present in IFN-gamma receptor KO mice. The increase of systemic infection in IFN-deficient mice was also observed during simian strain SA11 infection but not following bovine NCDV, porcine OSU, or murine strain EW infection. Our data indicate that the requirements for the interferon system to inhibit intestinal and extraintestinal viral replication in suckling mice vary among different heterologous and homologous rotavirus strains, and this variation is associated with lethal systemic disease.
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Affiliation(s)
- N Feng
- Stanford University, Stanford, California, USA
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Hoard JL, Hoover DB, Mabe AM, Blakely RD, Feng N, Paolocci N. Cholinergic neurons of mouse intrinsic cardiac ganglia contain noradrenergic enzymes, norepinephrine transporters, and the neurotrophin receptors tropomyosin-related kinase A and p75. Neuroscience 2008; 156:129-42. [PMID: 18674600 DOI: 10.1016/j.neuroscience.2008.06.063] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [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: 02/14/2008] [Revised: 06/05/2008] [Accepted: 06/28/2008] [Indexed: 11/20/2022]
Abstract
Half of the cholinergic neurons of human and primate intrinsic cardiac ganglia (ICG) have a dual cholinergic/noradrenergic phenotype. Likewise, a large subpopulation of cholinergic neurons of the mouse heart expresses enzymes needed for synthesis of norepinephrine (NE), but they lack the vesicular monoamine transporter type 2 (VMAT2) required for catecholamine storage. In the present study, we determined the full scope of noradrenergic properties (i.e. synthetic enzymes and transporters) expressed by cholinergic neurons of mouse ICG, estimated the relative abundance of neurons expressing different elements of the noradrenergic phenotype, and evaluated the colocalization of cholinergic and noradrenergic markers in atrial nerve fibers. Stellate ganglia were used as a positive control for noradrenergic markers. Using fluorescence immunohistochemistry and confocal microscopy, we found that about 30% of cholinergic cell bodies contained tyrosine hydroxylase (TH), including the activated form that is phosphorylated at Ser-40 (pSer40 TH). Dopamine beta-hydroxylase (DBH) and norepinephrine transporter (NET) were present in all cholinergic somata, indicating a wider capability for dopamine metabolism and catecholamine uptake. Yet, cholinergic somata lacked VMAT2, precluding the potential for NE storage and vesicular release. In contrast to cholinergic somata, cardiac nerve fibers rarely showed colocalization of cholinergic and noradrenergic markers. Instead, these labels were closely apposed but clearly distinct from each other. Since cholinergic somata expressed several noradrenergic proteins, we questioned whether these neurons might also contain trophic factor receptors typical of noradrenergic neurons. Indeed, we found that all cholinergic cell bodies of mouse ICG, like noradrenergic cell bodies of the stellate ganglia, contained both tropomyosin-related kinase A (TrkA) and p75 neurotrophin receptors. Collectively, these findings demonstrate that mouse intrinsic cardiac neurons (ICNs), like those of humans, have a complex neurochemical phenotype that goes beyond the classical view of cardiac parasympathetic neurons. They also suggest that neurotrophins and local NE synthesis might have important effects on neurons of the mouse ICG.
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Affiliation(s)
- J L Hoard
- Department of Pharmacology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA
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Karmely M, Rubinstein DB, Pichinuk E, Ziv R, Benhar I, Feng N, Wreschner DH. Inhibiting MUC1 a/b chain interaction mediates cytotoxicity of cells expressing MUC1: The MUC1 dyad oncoprotein as a functional target. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.14000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Fenaux M, Cuadras MA, Feng N, Jaimes M, Greenberg HB. Extraintestinal spread and replication of a homologous EC rotavirus strain and a heterologous rhesus rotavirus in BALB/c mice. J Virol 2007; 80:5219-32. [PMID: 16699002 PMCID: PMC1472171 DOI: 10.1128/jvi.02664-05] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [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: 12/27/2022] Open
Abstract
Although rotavirus infection has generally been felt to be restricted to the gastrointestinal tract, over the last two decades there have been sporadic reports of children with acute or fatal cases of rotavirus gastroenteritis testing positive for rotavirus antigen and/or nucleic acid in various extraintestinal locations such as serum, liver, kidney, bladder, testes, nasal secretions, cerebrospinal fluid, and the central nervous system. Recently, studies in animals and people have demonstrated that rotavirus antigenemia is a common event during natural infection. In this study, we extend these observations and compare the intestinal and extraintestinal spread of wild-type homologous murine rotavirus EC and a heterologous strain, rhesus rotavirus (RRV), in newborn mice. A strand-specific quantitative reverse transcription-PCR (ssQRT-PCR) assay was used to quantify the ability of different rotavirus strains to spread and replicate extraintestinally. Both strain EC and RRV were detected extraintestinally in the mesenteric lymph nodes (MLN), livers, lungs, blood, and kidneys. Extraintestinal replication, as measured by ssQRT-PCR, was most prominent in the MLN and occurred to a lesser degree in the livers, kidneys, and lungs. In the MLN, strain EC and RRV had similar (P < 0.05) RNA copy numbers, although EC was present at a 10,000-fold excess over RRV in the small intestine. Rotavirus nonstructural protein 4 (NSP4) and/or assembled triple-layered particles, indicated by immunostaining with the VP7 conformation-dependent monoclonal antibody 159, were detected in the MLN, lungs, and livers of EC- and RRV-inoculated mice, confirming the ssQRT-PCR findings. Infectious RRV was detected in the MLN in quantities exceeding the amount present in the small intestines or blood. The cells in the MLN that supported rotavirus replication included dendritic cells and potentially B cells and macrophages. These data indicate that extraintestinal spread and replication occurs commonly during homologous and some heterologous rotaviral infections; that the substantial host range restrictions for rhesus rotavirus, a heterologous strain present in the intestine, are not necessarily apparent at systemic sites; that the level and location of extraintestinal replication varies between strains; that replication can occur in several leukocytes subsets; and that extraintestinal replication is likely a part of the normal pathogenic sequence of homologous rotavirus infection.
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Affiliation(s)
- M Fenaux
- Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA 94305, USA
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Forster GL, Feng N, Watt MJ, Korzan WJ, Mouw NJ, Summers CH, Renner KJ. Corticotropin-releasing factor in the dorsal raphe elicits temporally distinct serotonergic responses in the limbic system in relation to fear behavior. Neuroscience 2006; 141:1047-1055. [PMID: 16713119 DOI: 10.1016/j.neuroscience.2006.04.006] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [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] [Received: 10/26/2005] [Revised: 02/12/2006] [Accepted: 04/06/2006] [Indexed: 11/17/2022]
Abstract
The neurotransmitters serotonin and corticotrophin-releasing factor are thought to play an important role in fear and anxiety behaviors. This study aimed to determine the relationship between corticotrophin-releasing factor-evoked changes in serotonin levels within discrete regions of the limbic system and the expression of fear behavior in rats. The effects of corticotrophin-releasing factor administration to the serotonin cell body regions of the dorsal raphe nucleus on fear behavior, behavioral activity, and extracellular serotonin levels were assessed in freely moving rats with microdialysis probes implanted into the central nucleus of the amygdala and the medial prefrontal cortex. Infusion of corticotrophin-releasing factor (0.5 microg) into the dorsal raphe rapidly induced freezing behavior, which was positively correlated with an immediate increase in serotonin release in the central nucleus of the amygdala. In contrast, cessation of freezing behavior correlated with a delayed and prolonged increase in serotonin release within the medial prefrontal cortex. Our findings suggest that corticotrophin-releasing factor-induced freezing behavior is associated with regionally and temporally distinct serotonergic responses in the limbic system that may reflect differing roles for these regions in the expression of fear/anxiety behavior.
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Affiliation(s)
- G L Forster
- Division of Basic Biomedical Sciences, Neuroscience Group, Sanford School of Medicine at the University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA.
| | - N Feng
- Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
| | - M J Watt
- Division of Basic Biomedical Sciences, Neuroscience Group, Sanford School of Medicine at the University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA; Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
| | - W J Korzan
- Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA; Department of Biological Sciences, Stanford University, 371 Serra Mall, Stanford, CA 94305, USA
| | - N J Mouw
- Division of Basic Biomedical Sciences, Neuroscience Group, Sanford School of Medicine at the University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA; Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
| | - C H Summers
- Division of Basic Biomedical Sciences, Neuroscience Group, Sanford School of Medicine at the University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA; Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
| | - K J Renner
- Division of Basic Biomedical Sciences, Neuroscience Group, Sanford School of Medicine at the University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA; Department of Biology, University of South Dakota, 414 East Clark Street, Vermillion, SD 57069, USA
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28
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Benatar T, Cao MY, Lee Y, Feng N, Gu X, Lee V, Jin H, Wang M, Der S, Wright JA, Young AH. Virulizin induces production of IL-17E to enhance antitumor activity by recruitment of eosinophils into tumors. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.2537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- T. Benatar
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - M. Y. Cao
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - Y. Lee
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - N. Feng
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - X. Gu
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - V. Lee
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - H. Jin
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - M. Wang
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - S. Der
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - J. A. Wright
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
| | - A. H. Young
- Lorus Therapeutics Inc., Toronto, ON, Canada; Univ of Toronto, Toronto, ON, Canada
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29
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Gelernter-Yaniv L, Feng N, Sebring NG, Hochberg Z, Yanovski JA. Associations between a polymorphism in the 11 beta hydroxysteroid dehydrogenase type I gene and body composition. Int J Obes (Lond) 2003; 27:983-6. [PMID: 12861241 DOI: 10.1038/sj.ijo.0802327] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We investigated 11 beta hydroxysteriod dehydrogenase type 1 (11betaHSD-1) sequence variants in 103 healthy overweight (BMI >2 s.d.) and 160 nonoverweight (BMI -2 to +2 SD) children to examine the associations between body composition and 11betaHSD-1 polymorphisms. A total of 4.3% of children were homozygous and 30.0% heterozygous for an adenine insertion in intron 3 (ins4436A). By ANCOVA (adjusting for age, sex, race, and height), BMI-s.d. differed according to ins4436A genotype (P<0.005), with the greatest BMI-SD for ins4436A homozygotes (mean +/-s.d., 3.4+/-3.4, vs heterozygotes, 0.8+/-5.5, or wild-type, 1.8+/-7.5). Homozygotes also had greater waist circumference, waist-to-hip ratio, and insulin resistance indices than heterozygote or wild-type children (all P<0.05), but no significant differences in trunk fat by DXA, or in serum lipids. We conclude an intronic 11betaHSD-1 gene polymorphism is associated with greater body mass, altered body composition, and insulin resistance in children. 11betaHSD-1 may be one of the genes relevant for pediatric-onset obesity and its complications.
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Affiliation(s)
- L Gelernter-Yaniv
- Pediatric and Reproductive Endocrinology Branch, NICHD, National Institutes of Health, Bethesda, MD, USA
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30
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Zhu W, Feng N, Wang Y, Ye G. [Gene polymorphism at apoB locus and the serum lipids profile in children]. Wei Sheng Yan Jiu 2001; 30:280-2. [PMID: 12561593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The relations of gene polymorphism at the apolipoprotein B locus and serum lipid profile in children was studied in 308 normal 7-11 year-old children, including 151 boys and 157 girls. Blood samples were collected for all subjects, and then the serum and blood clot were separated. Serum lipids, including TC, TG, LDL-C, HDL-C, apoB, apoA I and Lp(a) were detected. Genome DNA was extracted from blood clot, then apoB-Xba I gene polymorphism were tested by PCR-RFLP method. The results showed that the distribution of apoB-Xba I genotype in 308 children accorded with Hardy-Weiberg inheritance equilibrium law. The frequency of heterozygote(+/-) was 13.3%, allele(+) was 0.067. The frequency of allele(+) was closed to the internal and Japanese reports (0.033 and 0.04), but much less than the Caucasians (0.50). This showed a ethnic and population difference in the inheritance variation. The average LDL-C levels of the heterozygotes(+/-) were 2.17 mmol/L, no difference compared with homozygotes(-/-) (2.21 mmol/L, P > 0.05). There was also no difference for the genotype distribution between the hyperlipidemia group and control group, which may be the results of no enough sample size and the sample selection, and so on. On the other hand, in normal children, serum lipids controlled by many genes, the effect of a single gene might be small. More studies and analysis on the relationship between serum lipids and multiple genes in multisites should be the next step.
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Affiliation(s)
- W Zhu
- Institute of Child and Adolescent Health, Peking University, Beijing 100083, China
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31
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Zhu W, Feng N, Wang Y. [Relationship between gene polymorphism at the apolipoprotein E locus and serum lipid profile in urban children of school age in Beijing]. Zhonghua Yu Fang Yi Xue Za Zhi 2001; 35:297-300. [PMID: 11769625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To study the relationship between gene polymorphism at the apolipoprotein E (ApoE) locus and serum lipid levels in children of school age. METHODS Blood samples were collected from 307 normal children aged 7 to 11 years, including 150 boys and 157 girls, and their serum lipid profile, including total cholesterol (TC), triglyceride (TG), low-density lipoprotein-cholesterol (LDL-C), high-density lipoprotein-cholesterol (HDL-C), apolipoprotein B(apoB), apoprotein A1 (ApoA I) and lipoptoein alpha[LP (alpha)], were detected and their ApoE-Hha I gene polymorphism were tested by the PCR-RFLP method. RESULTS The detection rates for the most frequent genotype ApoE3/3 was 54.7%, other genotypes E4/3, E4/4, E3/2, E4/2 and E2/2 were 23.8%, 9.1%, 8.1%, 3.9% and 0.3%, respectively, in 307 children, with no significant difference between girls and boys(P > 0.05). Frequency of the often seen allele E3 was 70.7%, and that of E4 and E2 was 23.0% and 6.4, respectively, with E4 significantly higher than and E2 similar to that in the other domestic reports. The levels of TC, LDL-C, ApoA I and ApoB were higher in boys with genotypes E4/3 and E3/3 than those with genotypes E3/2 and E4/2. Levels of TC and ApoA I in the boys with genotype E3/2 were higher, with TC of 4.28 mmol/L and ApoA I of 3.41 mmol/L. There were no significant difference in serum lipid levels of girls with different genotypes(P > 0.05). There also was no significant difference in the ApoE-Hha I genotype distribution between normal children and those with high TC. ApoE2 could decrease the level of TC by 0.377 mmol/L, and LDL-C by 0.329 mmol/L. CONCLUSIONS Serum level of TC associated with polymorphism of ApoE gene carrier in boys, with the lowest levels of TC, LDL-C and ApoE in three with allele E2.
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Affiliation(s)
- W Zhu
- Institute of Child and Adolescent Health, Peking University, Beijing 100083, China
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32
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Abstract
The interaction between the rotavirus proteins viral protein 6 (VP6) and VP7 was examined in several exogenous protein expression systems. These proteins associated in the absence of other rotaviral proteins as demonstrated by a coimmunoprecipitation assay. Deletion analysis of VP7 indicated that truncations of either the mature amino or carboxyl terminus disrupted the proper folding of the protein and were not able to coimmunoprecipitate VP6. Truncation analysis of VP6 indicated that trimerization of VP6 was necessary, but not sufficient, for VP7 binding. MAb mapping and coimmunoprecipitation interference assays indicate that the VP6 amino acid residues between 271 and 342 are required for VP7 interaction. The interaction of VP6 and VP7 was also examined by the assembly of soluble VP7 onto baculovirus-expressed virus-like particles containing VP2 and VP6. Abrogation of this binding by preincubation of the particles with VP6 MAbs mapped to this same domain of VP6, validated our coimmunoprecipitation results. VP6 IgA MAbs that have been shown to be protective in vivo, but not a nonprotective IgA MAb, can interfere with VP7 binding to VP6. This suggests that these IgA MAbs may protect against rotavirus infection by blocking rotavirus assembly.
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Affiliation(s)
- J M Gilber
- Stanford University School of Medicine, Department of Microbiology and Immunology and the Palo Alto V. A. Health Care System, California 9430, USA
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33
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Ren YJ, Xu XH, Zhong CB, Feng N, Wang XL. Hypercholesterolemia alters vascular functions and gene expression of potassium channels in rat aortic smooth muscle cells. Acta Pharmacol Sin 2001; 22:274-8. [PMID: 11742577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
AIM To investigate the effects of hypercholesterolemia on functions of rat aorta and on gene expression of inward rectifier and ATP-sensitive potassium channels in aortic smooth muscle. METHODS Rats were treated with high-cholesterol emulsion ig for 2 weeks; the aortic rings with and without endothelium were prepared to examine the aortic contractile and relaxation responses; RT-PCR was used to observe the gene expression of inward rectifier and ATP-sensitive potassium channels. RESULTS Hypercholesterolemia damaged the endothelium-dependent vascular functions severely, but did not affect the endothelium-independent vascular functions; Kir6.2 mRNA expression was upregulated (P < 0.05) and Kir3.1 mRNA expression was downregulated markedly (P < 0.05) in hypercholesterolemic smooth muscle. CONCLUSION Hypercholesterolemia altered the vascular functions and regulated gene expression levels of specific inward rectifier and ATP-sensitive potassium channel subtypes.
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MESH Headings
- Animals
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/pathology
- Gene Expression
- Hypercholesterolemia/metabolism
- Hypercholesterolemia/physiopathology
- Male
- Muscle Contraction/physiology
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Potassium Channels/biosynthesis
- Potassium Channels/genetics
- Potassium Channels, Inwardly Rectifying/biosynthesis
- Potassium Channels, Inwardly Rectifying/genetics
- RNA, Messenger/genetics
- Rats
- Rats, Wistar
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Affiliation(s)
- Y J Ren
- Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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Kuklin NA, Rott L, Feng N, Conner ME, Wagner N, Müller W, Greenberg HB. Protective intestinal anti-rotavirus B cell immunity is dependent on alpha 4 beta 7 integrin expression but does not require IgA antibody production. J Immunol 2001; 166:1894-902. [PMID: 11160237 DOI: 10.4049/jimmunol.166.3.1894] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Rotavirus (RV) is the main cause of severe gastroenteritis in young children; protection has been correlated with intestinal Ab responses. Using a mouse model of RV infection and beta(7)-deficient (beta(7)(-/-)) mice, which do not express alpha(4)beta(7) integrin, we demonstrated the importance of alpha(4)beta(7) integrin in B cell-mediated anti-RV immunity. beta(7)(-/-) mice acutely infected with murine RV resolved infection and developed normal serum IgG Abs but had diminished intestinal IgA responses. alpha(4)beta(7)(-/-) immune B cells did not resolve RV infection when adoptively transferred into RV-infected Rag-2-deficient mice. Fewer RV-specific B cells were found in the intestine of Rag-2-deficient mice transferred with beta(7)(-/-) B cells compared with wild type. The absence of alpha(4)beta(7) expression and/or a lower frequency of IgA-producing cells among transferred beta(7)(-/-) B cells could have accounted for the inability of these cells to resolve RV infection following passive transfer. To distinguish between these possibilities, we studied the importance of IgA production in RV infection using IgA-deficient (IgA(-/-)) mice. IgA(-/-) mice depleted of CD8(+) T cells were able to clear primary RV infection. Similarly, adoptive transfer of immune IgA(-/-) B cells into chronically infected Rag-2-deficient mice resolved RV infection. We further demonstrated in both wild-type and IgA(-/-) mice that, following oral RV infection, protective B cells reside in the alpha(4)beta(7)(high) population. Our findings suggest that alpha(4)beta(7) integrin expression is necessary for B cell-mediated immunity to RV independent of the presence of IgA.
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Affiliation(s)
- N A Kuklin
- Department of Microbiology and Immunology, Palo Alto Health Care System, Palo Alto, CA 94305, USA.
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35
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Qu S, Feng N, Liu Z, Zhou H, Deng Y, Feng Z. The binding ability analysis of the normal VLDL receptor and its mutant. Curr Med Sci 2001; 21:177-80, 194. [PMID: 12539569 DOI: 10.1007/bf02886422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2001] [Indexed: 10/19/2022]
Abstract
The ligand-binding domain of VLDL receptor contains eight imperfectly similar repeats. To discuss the contribution of each repeat to ligand binding, the RT-PCR technique was used to clone the VLDLR-cDNA from the heart muscle of Chinese people. Two recombinants were further constructed, which contained the full-length cDNA of VLDLR and the mutant lacking repeats 1-5. CHO cell line was transfected with two recombinants. The expression of VLDLR gene could be detected by RT-PCR from the CHO cells transfected with pCD-VR. The results of binding experiments showed that the ability of the CHO cells transfected with the full-length cDNA of VLDL-R binding DiI-labeled beta-VLDL was higher than that of the CHO cells transfected with the mutant. Our findings indicated that human VLDL-R gene could be expressed effectively on CHO cells, and the receptor was almost inactivated when repeats 1-5 were deleted.
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Affiliation(s)
- S Qu
- Department of Biochemistry, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030
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36
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Kuklin NA, Rott L, Darling J, Campbell JJ, Franco M, Feng N, Müller W, Wagner N, Altman J, Butcher EC, Greenberg HB. alpha(4)beta(7) independent pathway for CD8(+) T cell-mediated intestinal immunity to rotavirus. J Clin Invest 2000; 106:1541-52. [PMID: 11120761 PMCID: PMC381473 DOI: 10.1172/jci10927] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [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: 08/02/2000] [Accepted: 11/06/2000] [Indexed: 11/17/2022] Open
Abstract
Rotavirus (RV), which replicates exclusively in cells of the small intestine, is the most important cause of severe diarrhea in young children worldwide. Using a mouse model, we show that expression of the intestinal homing integrin alpha(4)ss(7) is not essential for CD8(+) T cells to migrate to the intestine or provide immunity to RV. Mice deficient in ss7 expression (ss7(-/-)) and unable to express alpha(4)ss(7) integrin were found to clear RV as quickly as wild-type (wt) animals. Depletion of CD8(+) T cells in ss7(-/-) animals prolonged viral shedding, and transfer of immune ss7(-/-) CD8(+) T cells into chronically infected Rag-2-deficient mice resolved RV infection as efficiently as wt CD8(+) T cells. Paradoxically, alpha(4)ss(7)(hi) memory CD8(+) T cells purified from wt mice that had been orally immunized cleared RV more efficiently than alpha(4)ss(7)(low) CD8(+) T cells. We explained this apparent contradiction by demonstrating that expression of alpha(4)ss(7) on effector CD8(+) T cells depends upon the site of initial antigen exposure: oral immunization generates RV-specific CD8(+) T cells primarily of an alpha(4)ss(7)(hi) phenotype, but subcutaneous immunization yields both alpha(4)ss(7)(hi) and alpha(4)ss(7)(low) immune CD8(+) T cells with anti-RV effector capabilities. Thus, alpha(4)ss(7) facilitates normal intestinal immune trafficking to the gut, but it is not required for effective CD8(+) T cell immunity.
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Affiliation(s)
- N A Kuklin
- Department of Microbiology and Immunology, Department of Pathology, Stanford University School of Medicine, Stanford, California, USA.
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37
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Tang FL, Xu WJ, Feng N. [Micro determination of acrylonitrile in ambient air by gas chromatography]. Se Pu 2000; 18:473-4. [PMID: 12541718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
Acrylonitrile in ambient air was collected by Tenax GC and then thermo-desorbed. It was separated on GDX-502 chromatographic column from other pollutants and determined by flame-ion ization detector. The minimum detectable concentration was 0.01 mg/m3 when 2 L ambient air was collected. The recoveries were 85.6%-105.4% and RSDs were 4.5%-6.2%.
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Affiliation(s)
- F L Tang
- Hangzhou Environmental Monitoring Centre, Hangzhou 310007, China
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38
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Lutz RA, Feng N, Moser R. Binding of interleukin-13 and interleukin-4 to the interleukin (IL)-4/IL-13 receptor of human synovial fibroblasts. J Recept Signal Transduct Res 1999; 19:181-90. [PMID: 10071757 DOI: 10.3109/10799899909036644] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Synovial fibroblasts expressed transcripts for IL-4R alpha, and IL-13R alpha 1 and IL-13R alpha 2. Using weighted nonlinear computer modeling of the data from equilibrium binding studies, a 2 bindings sites model fitted the data best. After occupation of the shared high affinity receptors by the non-signaling, double mutant IL-4(121)R-->D, 124Y-->D (RY-IL-4) the high affinity binding of IL-13 could be abolished. A 2 binding site model still could be fitted, however the improvement in fit over a onesite model was not statistically significant. Using affinity spectra, at least 2 binding sites are apparent. After treatment with RY-IL-4, some of the high affinity binding was abolished, however not completely. A correlation between the number of binding sites and the affinity is apparent, which seriously casts doubt on the classical evaluation of binding isotherms, where the parameters are assumed to be independent. In a previous study we suggested that the large number of IL-13R alpha 2 monomers are silent receptors, likely representing a decoy target for IL-13. The high affinity binding therefore most likely represents the binding to the heterodimer consisting of IL-4R alpha and IL-13R alpha 1 or IL-13R alpha 2. The low affinity binding may represent the IL-13R alpha 2.
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Affiliation(s)
- R A Lutz
- Institute of Clinical Chemistry, University Hospital, Zürich
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39
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Feng N, Yan J, Qu F, Wei S. [Methods for assay of antibacterial activity of inorganic antibacterial agents]. Zhonghua Yu Fang Yi Xue Za Zhi 1998; 32:315-6. [PMID: 10322781] [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: 02/12/2023]
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40
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Feng N, Lugli SM, Schnyder B, Gauchat JF, Graber P, Schlagenhauf E, Schnarr B, Wiederkehr-Adam M, Duschl A, Heim MH, Lutz RA, Moser R. The interleukin-4/interleukin-13 receptor of human synovial fibroblasts: overexpression of the nonsignaling interleukin-13 receptor alpha2. J Transl Med 1998; 78:591-602. [PMID: 9605184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Interleukin (IL)-4 and IL-13 are known to bind to shared heteromultimeric receptor complexes of variable composition. Given the many regulatory effects of IL-4 and IL-13 on synovial cells, we aimed to characterize their IL-4/IL-13 receptor (R). Cultivated synovial fibroblasts expressed transcripts for IL-4Ralpha and IL-13Ralpha1, the human homolog of the recently cloned mouse IL-13R, but not the common gamma-chain of the IL-2R. In particular, IL-13Ralpha2 mRNA, encoding a different IL-13R recently cloned from human renal carcinoma cells, was expressed at a strikingly high level. Correspondingly, a predominant protein migrating at 65 to 75 kd was cross-linked by iodinated IL-13 and was not cross-competed by an excess of unlabeled IL-4. However, by flow cytofluorometry, IL-13Ralpha1 (detected by the anti-lL-13Ralpha1 mAb 65) and IL-4Ralpha (detected by the mAb S697) were expressed at similar low density. Radioligand binding studies revealed for both cytokines approximately 300 receptors/cell with similar high affinity. An additional class of IL-13Rs was identified after occupation of the shared high-affinity receptors by the nonsignaling, double-mutant IL-4121R-->D, 124Y-->D (RY-IL-4). In these experiments, 1251-IL-13 bound to a single receptor population with a Kd of approximately 300 pM and approximately 5000 sites/cell, matching the published affinity of monomeric IL-13Ralpha2 when expressed in COS7 cells. RY-IL-4 blocked the IL-4- and IL-13-mediated vascular cell adhesion molecule (VCAM)-1 expression and Stat6 activation, suggesting that the large number of high-affinity IL-13Ralpha2 monomers are silent receptors, likely representing a decoy target for IL-13.
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Affiliation(s)
- N Feng
- Institute of Clinical Chemistry, University Hospital, Zurich, Switzerland
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Ludert JE, Mason BB, Angel J, Tang B, Hoshino Y, Feng N, Vo PT, Mackow EM, Ruggeri FM, Greenberg HB. Identification of mutations in the rotavirus protein VP4 that alter sialic-acid-dependent infection. J Gen Virol 1998; 79 ( Pt 4):725-9. [PMID: 9568967 DOI: 10.1099/0022-1317-79-4-725] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [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: 11/18/2022] Open
Abstract
To explore further the role of VP4 as the rotavirus cell attachment protein, VP7 monoreassortants derived from the sialic-acid-dependent simian strain RRV and from the sialic-acid-independent human strains D, DS-1 and ST-3 were tested for susceptibility of infectivity of neuraminidase-treated MA-104 cells. Infectivity of RRV x D VP7 and RRV x ST-3 VP7 monoreassortants decreased when sialic acid was removed from the cell surface. However, of three separate RRV x DS-1 VP7 monoreassortants tested, only one was sialic-acid-dependent. Sequence analysis showed that both sialic-acid-independent strains contained a single amino acid change, Lys to Arg, at position 187. In addition, sialic-acid-independent infectivity was seen in one of 14 RRV VP4 neutralization escape mutants tested, and this strain was found to have a Gly to Glu change at amino acid position 150. These results indicate that positions 150 and 187 of VP4 play an important role in early rotavirus-cell interactions.
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Affiliation(s)
- J E Ludert
- Department of Medicine, Stanford University School of Medicine, CA 94305, USA.
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42
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Feng N, Ma J, Shao L. [Association between levels of plasma lipid profile with apolipoprotein B gene polymorphism in 93 children]. Zhonghua Yu Fang Yi Xue Za Zhi 1998; 32:106-8. [PMID: 10322811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
OBJECTIVE To study the relationship between levels of plasma lipid profile and variation of apolipoprotein (Apo) B gene. METHODS The relationship between frequency of polymorphism genotype of Apo B gene Xba I locus and levels of plasma lipid profile was studied in 93 children aged eight to eleven years. RESULTS The frequency of dominant X- allele (common allele) in Xba I locus was 0.967 in the children and that of uncommon X+ allele 0.033. Average levels of plasma total cholesterol (TC) and low density lipoprotein cholesterol (LDL-ch) in children with X- X+ genotype (4.59 and 2.98 mmol/L, respectively) were significantly higher than those with X-X- genotype (3.84 and 2.32 mmol/L, respectively). Levels of TC and/or LDL-ch in 4 of 6, cases of X-X+ genotype exceeded their the 90th percentile, indicating association between X+ allele and high plasma cholesterol level. CONCLUSION To certain extent, there is association between polymorphism of Xba I locus of Apo B gene and levels of plasma lipid profile in children, which may be a genetic marker for abnormal level of plasma lipid profile during childhood.
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Affiliation(s)
- N Feng
- Institute of Child and Adolescent Health, Beijing Medical University
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Angel J, Tang B, Feng N, Greenberg HB, Bass D. Studies of the role for NSP4 in the pathogenesis of homologous murine rotavirus diarrhea. J Infect Dis 1998; 177:455-8. [PMID: 9466536 DOI: 10.1086/517374] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
A rotavirus (RV) nonstructural protein, NSP4, has recently been proposed to function as an enterotoxin in the pathogenesis of RV diarrhea. The role of NSP4 in the pathogenesis of RV diarrhea was examined by infecting cystic fibrosis transmembrane conductance regulator (CFTR) knockout mice with virulent murine RV and by comparing deduced amino acid sequences of RV gene 10 encoding NSP4 from three distinct sets of virulent and tissue culture-adapted avirulent variant RVs. Homozygous CFTR (CFTR-/-) mice, which do not respond to any known intestinal secretagogues, experienced diarrhea comparable to that in normal CFTR+/+ littermates after RV challenge. Comparison of amino acid sequences of NSP4 from virulent and attenuated pairs of RVs failed to show consistent or significant changes. Together, these data suggest that enterotoxigenic properties of RV NSP4 are not critical in the pathogenesis of murine RV diarrhea and that attenuation of murine RVs is not usually mediated by mutations in the gene encoding NSP4.
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Affiliation(s)
- J Angel
- Department of Medicine, Stanford Digestive Disease Center, Stanford University, California, USA
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Feng N, Zhang Z, An D, Huang W, Wang G, Han X, Bao X. Investigation of the metabolism of 7-(4-chlorbenzyl)-7,8,13,13a-tetrahydroberberine chloride in the rat. Eur J Drug Metab Pharmacokinet 1998; 23:41-4. [PMID: 9625271 DOI: 10.1007/bf03189825] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The metabolism of 7-(4-chlorbenzyl)-7,8,13,13a-tetrahydroberberine chloride (CTHB), a compound with promising pharmacological effects against arrhythmia, was investigated in rat bile. A metabolite and unchanged CTHB were found in the bile. Characterization and structural elucidation of the metabolite was achieved by LC/MS and LC/NMR. The following metabolic pathway is proposed: CTHB is metabolized by demethylation at position 10 to produce a new entity.
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Affiliation(s)
- N Feng
- China Pharmaceutical University, Nanjing, People's Republic of China
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Ishida SI, Feng N, Gilbert JM, Tang B, Greenberg HB. Immune responses to individual rotavirus proteins following heterologous and homologous rotavirus infection in mice. J Infect Dis 1997; 175:1317-23. [PMID: 9180169 DOI: 10.1086/516462] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [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] [Indexed: 02/04/2023] Open
Abstract
Serum and intestinal humoral immune responses to rotavirus proteins VP2, VP4, VP6, VP7, NSP2, and NSP4 were quantitatively compared in mice infected with a homologous murine rotavirus (EHPw) or a heterologous simian rotavirus (RRV). Viral protein-specific antibody responses were measured by an immunohistochemistry assay that uses recombinant baculovirus-expressed rotavirus proteins as antigens. In serum, IgG responses to VP6 were dominant and comparable in both RRV- and EHPw-infected groups, but responses to VP2, VP4, VP7, and NSP2 were higher in RRV infection. In feces, IgA responses to VP2, VP4, and VP6 were higher in EHPw-infected mice, but responses to VP7 and NSP2 were detected only in the RRV-infected group. These findings indicate that immune responses to homologous and heterologous rotavirus infection vary both quantitatively and qualitatively. Differences in humoral responses may play a role in the differences in protection induced following homologous or heterologous rotavirus infection.
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Affiliation(s)
- S I Ishida
- Department of Medicine, Stanford University School of Medicine, California 94305-5487, USA
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46
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Lugli SM, Feng N, Heim MH, Adam M, Schnyder B, Etter H, Yamage M, Eugster HP, Lutz RA, Zurawski G, Moser R. Tumor necrosis factor alpha enhances the expression of the interleukin (IL)-4 receptor alpha-chain on endothelial cells increasing IL-4 or IL-13-induced Stat6 activation. J Biol Chem 1997; 272:5487-94. [PMID: 9038152 DOI: 10.1074/jbc.272.9.5487] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Functional receptors for interleukin (IL)-4 and IL-13 on endothelial cells consist of the 130-kDa IL-4 receptor alpha-chain (IL-4Ralpha) and a 65-75-kDa IL-13 binding subunit that are expressed in a ratio of about 1:3, respectively. The restricted number of IL-4Ralpha limits subunit heterodimerization and in turn receptor-mediated signaling. We report here, the effects of tumor necrosis factor alpha (TNF-alpha) on the expression of the receptor subunits for IL-4 and IL-13. By flow cytofluorometry and receptor-binding analysis of iodinated IL-4 and IL-13, stimulation with TNF-alpha-induced a 2-3-fold increase of the IL-4Ralpha expression. The up-regulation was also confirmed at the transcriptional level by reverse transcription-polymerase chain reaction. Radioligand cross-linking experiments revealed no change in the subunit composition of the TNF-alpha-induced receptor complex. Nevertheless, TNF-alpha stimulation led to increased activation of the IL-4-specific signal transducers and activators of transcription protein (Stat6) by IL-4 and IL-13. Thus, TNF-alpha corrects the subunit imbalance of the endothelial IL-4.IL-13 receptor complex thereby increasing receptor heterodimerization and in turn the signaling capability by IL-4 and IL-13.
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Affiliation(s)
- S M Lugli
- Institute of Toxicology, Federal Institute of Technology, CH-8057 Zurich, Switzerland
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Feng N, Vo PT, Chung D, Vo TV, Hoshino Y, Greenberg HB. Heterotypic protection following oral immunization with live heterologous rotaviruses in a mouse model. J Infect Dis 1997; 175:330-41. [PMID: 9203654 DOI: 10.1093/infdis/175.2.330] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
A Jennerian approach using live animal viruses to immunize humans is the current lead strategy for developing rotavirus vaccines. This strategy has been modified by incorporating human rotavirus VP7 genes into vaccine strains to induce serotype-specific neutralizing antibodies to human strains. However, the role of homotypic versus heterotypic immunity in protection is unclear. To investigate the importance of serotype-specific immunity in a mouse model, mice were immunized with rhesus rotavirus (RRV: G3, P5[3]), RRV-based modified Jennerian vaccine strains DxRRV (G1, P5[3]), DS1xRRV (G2, P5[3]), or ST3xRRV (G4, P5[3]), or bovine rotavirus NCDV (G6, P6[1]) and challenged with murine rotavirus ECw (G3, P[16]). Mice immunized with modified Jennerian vaccines exhibited complete to near-complete protection from challenge. NCDV-immunized mice also showed partial protection. The protection was correlated with fecal IgA levels to VP6, not serum IgG responses. Modified Jennerian vaccines induce both heterotypic and homotypic immunity in mice.
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Affiliation(s)
- N Feng
- Department of Medicine, Stanford University School of Medicine, California 94305, USA
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48
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Feng N, Ye G, Shao L. [A prevalence study on risk factors of cardiovascular disease during childhood]. Zhonghua Yu Fang Yi Xue Za Zhi 1997; 31:27-30. [PMID: 9812633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
A small size of sample for risk factors of cardiovascular disease, such as blood pressure, plasma lipids profile, obesity, dietary status, and family history of cardiovascular disease, etc. were studied in children aged eight to eleven years. Results showed that prevalence of hypertension, systolic blood pressure > 16.0 kPa (120 mmHg) or/and diastolic blood pressure > 10.7 kPa (80 mmHg), in them was 7.2 percent, blood lipid level in 21.9 percent of the children exceeded the recommended criteria of dietary intervention, and prevalence of simple obesity was 11.7 percent. The most prominent problem in dietary status was high cholesterol intake, with a daily intake of 483.4 mg in average, and 72 percent of the children exceeded 300 mg daily, as compared with previous data, and they exposure to higher level of risk factors for cardiovascular disease. It suggests that it is necessary to strengthen surveillance for risk factors of cardiovascular disease and intervention.
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Affiliation(s)
- N Feng
- Institute of Child and Adolescent Health, Beijing Medical University
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Abstract
The murine model of homologous rotavirus infection has been used to study the determinants of protection. The local IgA immune response appears to be the critical factor in generating protective immunity after natural infection. A series of knockout mice were used to evaluate the contribution of T cells and B cells to immunity and resolution from primary infection. Both arms of immune system played a role in the resolution of primary infection but antibody was much more important for prevention of reinfection.
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Affiliation(s)
- N Feng
- Department of Microbiology and Immunology, School of Medicine, Stanford University, California 94305, USA
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Abstract
Rotavirus-induced diarrhea is responsible for the death of approximately 800,000 children per year. Jennerian and modified Jennerian anti-rotavirus vaccines currently being tested have a moderate protective effect against rotavirus disease. Optimization of these vaccines, development of more efficient rationally designed vaccines, and identification of other strategies to prevent or treat rotavirus disease will rely on a thorough understanding of the host-virus relationship and especially on the immune mechanisms developed by the host against rotavirus. Recent advances in our understanding of the mouse model of rotavirus infection will enhance the understanding of human rotavirus disease.
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Affiliation(s)
- M A Franco
- Department of Medicine, Stanford University School of Medicine, Palo Alto, California, USA
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