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Chengdu, China

Gao J.-L.,University of Sichuan | Gao J.-L.,Chengdu Blood Center | Ding X.-P.,University of Sichuan | Liu D.-S.,University of Sichuan | Zhu Y.-J.,University of Sichuan
Genetics and Molecular Research | Year: 2011

Primed in situ labeling (PRINS) technique is an alternative to in situ hybridization for rapid chromosome screening. We employed triple-color PRINS technique to detect chromosomal abnormalities in Klinefelter syndrome patients diagnosed by G-banding karyotype analysis. Among 1034 infertile male patients, 134 were found to be cytogenetically abnormal, including 70 with chromosomal number abnormalities and 64 with chromosomal structure abnormalities. Among these cytogenetically abnormal patients, 56 were diagnosed as having Klinefelter syndrome. PRINS technique was used on cultured lymphocyte metaphase cells of the Klinefelter syndrome patients; the same result was obtained with G-banding karyotype analysis. PRINS proved to be a rapid and reliable method to detect numerical chromosome abnormalities in peripheral blood lymphocytes in metaphase. © 2011, FUNPEC-RP. Source

Gao J.-L.,Sichuan University | Gao J.-L.,Chengdu Blood Center | Nie Y.,Sichuan University | Ding X.-P.,Sichuan University
Genetics and Molecular Research | Year: 2011

In order to analyze male sterility caused by deletion of SRY and DAZ, we examined the accuracy and cost-effectiveness of a modified primed in situ labeling (PRINS) technique for detection of single-copy genes. Peripheral blood samples were collected from 50 healthy men; medium-term cultured lymphocytes from these samples were suspended in fixative solution and then spread on clean slides. We used four primers homologous to unique regions of the SRY and DAZ regions of the human Y-chromosome and incorporated reagents to increase polymerase specificity and to enhance the hybridization signal. PRINS of SRY and DAZ gave bands at Yp11.3 and Yq11.2, respectively, in all 50 metaphase spreads. The PRINS SRY signals were as distinct as those obtained using traditional fluorescence in situ hybridization (FISH). This new method is ideal for rapid localization of single-copy genes or small DNA segments, making PRINS a cost-effective alternative to FISH. Further enhancement of PRINS to increase its speed of implementation may lead to its wide use in the field of medical genetics. ©FUNPEC-RP. Source

Cao Y.,Peking Union Medical College | Wang H.,Peking Union Medical College | Yang C.,Shanghai JiaoTong University | Zhong R.,Peking Union Medical College | And 3 more authors.
Applied Surface Science | Year: 2011

Polyanion ligands such as acrylic acid (AA) and heparin were grafted on PBT Nonwoven Fabrics (PBTNF) to study their effect on the adsorption of low density lipoprotein (LDL). These modified PBTNFs were characterized by Horizontal Attenuated Total Reflectance Fourier Transform Infrared spectroscopy and X-ray Photoelectron spectroscopy. The blood compatibilities of the modified PBTNFs were examined using in vitro hemolysis rate (HR), platelet adhesion, total protein (TP) and activated partial thromboplastin time. The results showed that direct immobilized heparin could improve PBTNF-PAA's blood compatibility and decrease the adsorption capability of useful high density lipoprotein, but would possess so low bioactivity that could not further improve the absorption of LDL and TC. Since the PBTNF-PAA55-Heparin adsorbent had quite good adsorption selectivity for these proteins, it can be an excellent candidate for depletion of LDL with good blood compatibility. © 2011 Elsevier B.V. All rights reserved. Source

Gao J.-L.,Sichuan University | Gao J.-L.,Chengdu Blood Center | Ding X.-P.,Sichuan University | Li Q.-J.,Sichuan University | And 2 more authors.
Chinese Journal of Medical Genetics | Year: 2012

Objective: To investigate the effect of dihydroartemisinin (DHA) on the BCR/ABL fusion gene in leukemia K562 cell. Methods K562 cells were cultured in vitro. The rate of proliferation inhibition of cells treated with various concentrations of DHA were determined by using [3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] (MTT) method. Expression of BCR/ABL fusion gene was analyzed by reverse transcription(RT-PCR) before and after DHA treatment. Apoptosis of K562 cells was detected by flow cytometry. Results: The growth of K562 cells was inhibited when the concentrations of DHA were 10-160 μ,mol/L. With the added dose of DHA, the growth inhibition was remarkable, with the rate of inhibition risen from 52.76% to 94.65%. The expression of BCR/ARL fusion gene, as detected by RT-PCR after incubating the K562 cells with 20 μmol/L DHA, measured as ΔCt=4.45±0.25 after 12 h and ΔCt=5. 23±0.21 after 24 h, which was significantly lower compared with that of the control (ΔCt=4.23±0.21, P<0.05). Conclusion: DHA can inhibit the proliferation of leukemia K562 cells and facilitate the induction of apoptosis by downregulating the expression of BCR/ABL fusion gene. Source

Wang L.,National Center for Clinical Laboratories | Chang L.,National Center for Clinical Laboratories | Chang L.,Peking Union Medical College | Xie Y.,Shanghai Blood Center | And 13 more authors.
Transfusion | Year: 2015

Background: This study aimed at analyzing the prevalence of hepatitis B virus (HBV) DNA among hepatitis B surface antigen (HBsAg)-negative donations by cobas TaqScreen MPX test (Roche Molecular Systems) and discussing the meaning of a reactive minipool (MP) that does not resolve to an individual donation (ID)-reactive result. Study Design and Methods: Nucleic acid amplification testing (NAT) was performed in 12 Chinese blood centers on 826,044 serologic negative donations in MPs of six. MP-reactive pools that were resolved to ID-reactive donations were confirmed by Roche TaqMan viral load assays. Antibody to hepatitis B surface antigen and antibody to hepatitis B core antigen (anti-HBc) results were also analyzed. Cycle threshold (Ct) values of reactive MPs were analyzed in relation to the probability of pool resolution. Results: A total of 1267 of 137,674 pools were reactive, of which 839 donations were reactive by ID-NAT. The MP6 HBV NAT-yield rate lay between 1 in 1600 and 1 in 1000. At MP Ct values equal or below 37, the probability of pool resolution was approximately 80%. The prevalence of anti-HBc in ID-reactive donations was 81%. The proportion of reactive pools that could not be resolved was 36%. The prevalence of anti-HBc in donations implicated in nonresolved MPs was significantly higher than those in nonreactive MPs (48% vs. 37%, p = 0.016). Conclusion: The anti-HBc data suggest that approximately 10% of nonresolved MPs contain HBV DNA from a low-viral-load occult carrier. We consider ID-NAT resolution testing in duplicate to minimize HBV transmission risk associated with transfusing nonreactive donations implicated in reactive MPs. © 2014 AABB. Source

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