1.Mixed culture of Madin-Darby canine kidney cells, human epidermoid cancer cells and African green monkey kidney cells for detection of common respiratory viruses and enteroviruses
Yingyang GAO ; Chenyan JIANG ; Lufang JIANG ; Qianli WANG ; Liwen JU
Chinese Journal of Infectious Diseases 2011;29(6):321-324
Objective To establish a clinical test assay for detecting common respiratory viruses and enteroviruses (EV) by using mixed cultured Madin-Darby canine kidney cells (MDCK), human epidermoid cancer cells (Hep-2) and African green monkey kidney cells (Vero) to isolate common respiratory viruses and enteroviruses. Methods Throat swabs with influenza A and B viruses,adenovirus and EV71 were incubated with mixed cultured MDCK, Hep-2 and Vero in a single vial to observe the presence of cytopathic effects. Polymerase chain reaction (PCR), reverse transcription (RT)-PCR and monoclonal antibody-based immunofluorescene assay were also used for confirmatory test. Results The sensitive cell lines developed obvious cytopathic effects to the corresponding viruses, which were confirmed by the specific green particles observed by immunofluorescence assay and specific target PCR segments. Conclusions The shell-vial of mixed cells can simultaneously isolate different common respiratory viruses and EV. The isolated pathogens can be further confirmed by antigen test and PCR. This assay may improve the diagnosis of clinical viral diseases.
2.The sensitivity of cytopathic effect caused by influenza viruses in cultured Madin-Darby canine kidney cells
Chenyan JIANG ; Shijiao NIE ; Xihong Lü ; Yingyang GAO ; Liwen JU
Chinese Journal of Infectious Diseases 2010;28(7):390-392
Objective To understand the sensitivity of cytopathogenic effect (CPE) in MadinDarby canine kidney cells(MDCK) that cultured influenza A pharyngeal swab specimens of patients for one,two and three passages. Methods Influenza A pharyngeal swab specimens of patients were inoculated in MDCK for three blind passages. The presence of CPE of every passage was observed by inverted microscope. Results Of the 279 influenza A pharyngeal swab specimens of patients tested by colloidal gold, the presence of CPE in MDCK for one,two and three passages was 65.9%(184/279),91.4%(255/279) and 96.4%(269/279), respectively. Two hundred and seventy-one of 279specimens were identified as influenza A by multiplex reverse transcription-polymerase chain reaction (RT-PCR). Conclusion The positive separation rate can reach more than 95% by inoculating influenza A pharyngeal swab specimens of patients in MDCK for three blind passages.
3.Consideration of clinical trial design for human rabies vaccines with different immunization schedules
Xia DENG ; Bo LIU ; Chenyan GAO
Chinese Journal of Microbiology and Immunology 2021;41(12):974-978
This article referred to the relevant guidelines for vaccine clinical trials and the accumulated experience in the development and review of human rabies vaccines, as well as combined the technical recommendations for human rabies vaccines from major health facilities such as WHO, to discuss the key considerations in the design of clinical trials for human rabies vaccines, including control vaccines, evaluation of efficacy endpoints, clinical subjects, the sample size, immunity persistence, re-exposure immunization schedule and post-marketing study. This article aimed to provide reference for the design of human rabies vaccine clinical trials.
4.General considerations for clinical trials design of gene therapy drug for β-thalassemia
Yunhong HUANG ; Xiao LIU ; Chenyang ZHAO ; Shuang LU ; Chenyan GAO ; Jun MA
Journal of Leukemia & Lymphoma 2022;31(11):697-700
β-thalassemia is a single-gene genetic disease caused by β globin gene mutations leading to the fact that red blood cells are unable to form normal adult hemoglobin, and then patients develop hemolytic anemia. Current treatment regimens mainly include allogenetic hematologic stem cell transplantation, symptomatic regular blood transfusions and the use of iron removers to reduce iron load. Some severe patients have quite poor prognoses and deadly consequences if not treated timely. Genetically modified autohematopoietic stem cells can provide a new treatment option for patients with β thalassemia, which may achieve a long-term and stable increase in hemoglobin level through a single dose, making one-time cure β-thalassemia possible. This paper reviews the key elements of clinical trial design for β-thalassemia gene therapy from the aspects of efficacy evaluation endpoints, clinical trial design, enrollment population, and subject monitoring in order to provide a reference for pharma-therapeutic research and development enterprises.
5.The analysis of the changes of maternal thyroid autoantibodies during early pregnancy
Xiaoguang SHI ; Cheng HAN ; Chenyan LI ; Jinyuan MAO ; Weiwei WANG ; Xiaochen XIE ; Weiwei ZHOU ; Chenyang LI ; Lihua BI ; Tao MENG ; Shaowei ZHANG ; Jianling DU ; Zhengnan GAO ; Xiaomei ZHANG ; Chenling FAN ; Zhongyan SHAN ; Weiping TENG
Chinese Journal of Endocrinology and Metabolism 2016;32(5):376-379
Objective To investigate the changes and related factors of maternal thyroid autoantibodies during early pregnancy. Methods Urinary iodine concentration( UIC) , serum thyroid stimulating hormone( TSH) , free thyroxine ( FT4 ) , thyroid-peroxidase antibody ( TPOAb ) , thyroglobulin antibody ( TgAb ) concentrations were determined in 7 190 women during early pregnancy in an iodine-sufficient region of China. Results The prevalence of TPOAb positivity and TgAb positivity were 8. 7% and 12. 0% respectively. The prevalence of overt hypothyroidism and subclinical hypothyroidism increased significantly in group of thyroid antibody positivity. The prevalence of TPOAb positivity and TgAb positivity presented a U-shaped curve, ranging from mild iodine deficiency to iodine excess, especially increased significantly in the group with UIC<100 μg/L. Conclusion Prevalence of thyroid antibodies positivity became higher during early pregnancy. The positive thyroid autoantibodies during pregnancy were significantly associated with maternal hypothyroidism. Both iodine excess and iodine deficiency are risk factors of positive thyroid antibodies.
6.Severalconsiderationsontherelatedissuesofclinicaltrialdesignofchimericantigen receptorT lymphocytes in the treatment of lymphohematopoietic malignancies
GAO Jianchao ; HUANG Yunhong ; WANG Honghang ; WANG Huicheng ; PAN Jianhong ; GAO Chenyan
Chinese Journal of Cancer Biotherapy 2019;26(8):833-836
Chimeric antigen receptor (CAR) T lymphocyte has shown attractive prospects in the treatment of lymphohematopoietic malignancies including B-cell lymphoblastic leukemia, B-cell lymphoma and multiple myeloma. Many applicants have submitted investigational new drug (IND) applications to Center for Drug Evaluation of National Medical Products Ggency, however, many of the INDs have problems in patient selection, prognostic indicators and risk management, etc, which might hinder the evaluation of the safety and efficacy of CAR-T cells. Thus, we made some suggestions on the above-mentioned problems through summarizing clinical experience and communicating with domestic clinical experts, which the sponsors and researchers can refer to when conducting CAR-T cell clinical trials for registration.
7. Analysis of vaccination situation of orial live attenuated rotavirus vaccine (LLR strain) among children in 6 provinces of China
Yan LIU ; Chenyan YUE ; Yan LI ; Yamin WANG ; Shirui GAO ; Zhiguo WANG ; Xin XIE ; Hongping ZHAO ; Dong WANG ; Xuefeng LIANG ; Zhijie AN
Chinese Journal of Preventive Medicine 2018;52(3):282-286
Objective:
To analyze vaccination situation of oral live attenuated rotavirus vaccine (LLR strain) among children from six provinces in China.
Methods:
In 2014, we selected 12 counties in Guangdong, Jiangsu, Chongqing, Jiangxi, Heilongjiang and Gansu provinces by using stratified cluster random sampling method and extract information of children born from January 1, 2008 to December 31, 2012 from Children's Immunization Information System. We investigated ten children of each birth cohort in each county by checking the vaccination certification, and a total of 606 children were investigated. A survey was conducted to check the information of the children's vaccination certification with the data of Children's Immunization Information System by questionnaire including the basic information (province, county, name, gender, birth date, etc) and the rotavirus vaccination (vaccination date, dose, etc) to analyze the rotavirus vaccination situation.
Results:
340 of 606 children were male. There were 121, 124, 122, 119 and 120 children born in 2008-2012, respectively. The proportions of the first and the second dose of rotavirus vaccination were 32.8% (199) and 9.7% (59). The proportion of the third dose of rotavirus vaccination among children born between 2008 and 2010 was 3.5% (13) since children born in 2011 and 2012 did not reach the age of third dose vaccination. The proportion of the first dose of rotavirus vaccination in high, middle and low per capita disposable income areas was 45.0% (91), 37.7% (77) and 15.5% (31) respectively (χ2= 43.15,