1. Preparation of pH-sensitive procationic liposomes and tumor distribution study in mice
Chinese Pharmaceutical Journal 2012;47(6):444-447
OBJECTIVE: The pH-sensitive procationic liposomes were prepared, with hydroxycamptothecin (HCPT) as model drug. METHODS: The cationic liposomes were prepared by film dispersion method. The encapsulation efficiency was determined after removing unentrapped HCPT by Sephadex-G50 chromatographic column. Carboxymethyl chitosan was used to coat the cationic liposomes, then the liposomes were extruded through high pressure homogenizer. Zetasizer was used to determine the zeta potential, average size of the HCPT liposomes. pH sensitivity analysis was made through experiments of red blood cell hemolysis and tumor distribution is analysised. RESULTS: The size of liposomes was around 96 nm and drug encapsulation efficiency was 78.5%. The membrane fusion of red blood cells with procationic liposomes was significantly different between pH 6.5 and pH 7.4 and the in vivo experiments in tumor-bearing mice suggested that they had a high tumor distribution. CONCLUSION: The pH-sensitive procationic nanoliposomes were easy to prepare and were expected to be a promising anti-tumor drug delivery system. Copyright 2012 by the Chinese Pharmaceutical Association.
2.Molecular diagnosis of molar pregnancy.
Chinese Journal of Pathology 2011;40(1):6-10
DNA, Neoplasm
;
analysis
;
Female
;
Flow Cytometry
;
Humans
;
Hydatidiform Mole
;
diagnosis
;
genetics
;
In Situ Hybridization, Fluorescence
;
Microsatellite Repeats
;
Polymerase Chain Reaction
;
Polymorphism, Restriction Fragment Length
;
Pregnancy
;
Triploidy
;
Uterine Neoplasms
;
diagnosis
;
genetics
3.Effects of advanced glycosylation end products on interactions between cis-elements and trans-acting factors of hepatic insulin receptor gene
Jian RONG ; Changqing YU ; Pei YANG
Chinese Journal of Endocrinology and Metabolism 2009;25(1):17-21
Objective To explore the effects of advanced glyeosylation end products (AGEs) on the binding of hepatic nuclear factors to the human insulin receptor (hlR) gene promoter. Methods The oligonueleotides with hlR gene promoter activity, 42 bp (spanning -1 441 to -1 400, US1) or 146 bp (spanning -638 to -493), were artificially synthesized, with point mutations at 5 key G residues in 42 bp US1 m5 oligonucleotides. US1 and rat hepatic nuclear extracts (HNE) were incubated with glucose 6-phosphate, prior to non-competition and competition gel retardation electrophoresis. Results Competition gel retardation electrophoresis showed that the binding capacity of 32p-labeled US1 probe to HNE could be signifficantly decreased with increased US1. US1-AGEs and US1m5 decreased the binding of probe to HNE as well, but only partly affected the electrophoretie bands [1,5,10 ng US1-AGEs: (41.08±2.86)%, (27.64±2.92)%, (15.35±1.81%) vs (52.05±1.79)%]; 5,10 ng US1m5: (5.20± 1.03)%, (1.81±0.21)% vs (52.05±1.79)%]. AGEs formed on HNE could increase the binding of HNE to probe, along with nonspecifie binding increasing. Conclusion The impact of AGEs on hlR gene expression seems to be related to the effects on cis-elements and trans-acting factors.
4.Hemorheology of patients with silicosis.
Chinese Journal of Industrial Hygiene and Occupational Diseases 2007;25(9):563-565
Adult
;
Aged
;
Erythrocyte Indices
;
Hemorheology
;
Humans
;
Male
;
Middle Aged
;
Silicosis
;
blood
5.Research of RET in cancer:Current and future
Ji SUN ; Susheng MIAO ; Rong PEI
Practical Oncology Journal 2015;29(5):467-470
To review recent studies on the research advance of RET( Rearranged during transfection) on-cogene in thyroid cancer,breast cancer,and lung cancer.The literatures on the structure of RET gene and coding product,cell signal transduction,relationship among thyroid cancer,breast cancer,and lung cancer are reviewed. RET gene encoding tyrosine kinase receptor,involving in cell signal transduction,rearrangement of RET gene is frequently seen in thyroid cancer,which is reported more and more in breast cancer,and lung cancer.Rearrange-ment of RET gene is closely correlated with the occurrence and progress of thyroid cancer,breast cancer,and lung cancer.Taking together,these findings suggest that RET present an attractive therapeutic target for the treatment of certain cancer subsets.
7.Dynamic study and screening of new markers of spermatogonial stem cells by iTRAQ protein mass spectrometry.
Liang-hong MA ; Jia TIAN ; Xiu-ying PEI ; Yan-rong WANG ; Pei-jun LI
National Journal of Andrology 2015;21(3):200-207
OBJECTIVETo study the dynamic changes in the protein marker expression in the spermatogonial stem cells (SSCs) of mice at different ages by iTRAQ protein mass spectrometry and to screen new markers using the bioinformatic proteome database.
METHODSBased on the postnatal weeks, we divided 80 healthy male C57BL/6 mice into eight age groups of equal number, harvested their testicular tissues, extracted proteins following purification of the SSCs by compound enzyme digestion and magnetic-activated cell sorting. Then we analyzed and identified proteins using two-dimensional electrophoresis, protein mass spectrometry, and protein database information.
RESULTSTotally, 248,510 mass spectra were obtained from the MS experiment and 1132 proteins were identified. By the criteria of >1.2-fold for protein abundance difference and P value <0.05, we identified 298 differentially expressed proteins and 9 currently known makers of SSCs (PCNA, GFRalpha1, CDH1, Annexin A7, UCHL1, VASA, CD49f, CD29, and PLZf). Compara- tive analysis showed different expressions of the proteins in the SSCs of the mice of different ages, and the differences in the expressions of GFRalpha1, CD49f, and CD29 were consistent with the findings in other published literature. Ten proteins (P63, CD71, CD98, K19, ACE, K18, K15, K17, SH2, and SH3) were selected as SSC markers to be further studied.
CONCLUSIONThe proteins in SSCs are differentially expressed in mice of different ages. The technology of iTRAQ protein mass spectrometry can be used to analyze and compare the proteome information of mouse SSCs, obtain differentially expressed proteins in mice of different ages, and thus offers a new ap- proach to further analysis and study of the function and roles of these differential proteins.
Adult Stem Cells ; cytology ; metabolism ; Age Factors ; Animals ; Biomarkers ; analysis ; metabolism ; Cell Separation ; methods ; Electrophoresis, Gel, Two-Dimensional ; Male ; Mass Spectrometry ; Mice ; Mice, Inbred C57BL ; Proteins ; analysis ; metabolism ; Spermatogonia ; cytology
8.Effects of midazolam on hERG K+ channel.
Sheng-na HAN ; Pei WANG ; Wei ZHANG ; Li-rong ZHANG
Chinese Journal of Applied Physiology 2015;31(2):143-147
OBJECTIVETo investigate the effect of midazolam on human ether-a-go-go (hERG) K+ channels exogenously expressed in human embryonic kidney cells (HEK-293) and the underlying molecular mechanisms.
METHODSWhole-cell patch clamp technique was used to record WT, Y652A and F656C hERG K+ current expressed in HEK-293 cells.
RESULTSMidazolam inhibited hERG K+ current in a concentration-dependent manner, the half-maximum block concentrations (IC50) values were (1.31 ± 0.32) µmol/L. The half-activation voltage (V1/2) were (2.32 ± 0.38) mV for the control and (-1.96 ± 0.83) mV for 1.0 µmol/L midazolam. The half-inactivation voltage (V1/2) was slightly shifted towards negative voltages from (-49.25 ± 0.69) mV in control to (-57.53 ± 0.53) mV after 1.0 µmol/L midazolam (P < 0.05). Mutations in drug-binding sites (Y652A or F656C) of the hERG channel significantly attenuated the hERG current blockade by midazolam.
CONCLUSIONMidazolam can block hERG K+ channel and cause the speed of inactivation faster. Mutations in the drug-binding sites (Y652 or F656) of the hERG channel were found to attenuate hERG current blockage by midazolam.
Dose-Response Relationship, Drug ; Ether-A-Go-Go Potassium Channels ; drug effects ; HEK293 Cells ; Humans ; Midazolam ; pharmacology ; Mutation ; Patch-Clamp Techniques ; Potassium Channel Blockers ; pharmacology
10.Effects of Kanglaite injection on antitumor and expression of EGFR in Lewis lung carcinoma
Pei PAN ; Yan WU ; Rong WANG ; Yujie WANG
Chinese Journal of Clinical Pharmacology and Therapeutics 2000;0(01):-
AIM:To research the effects of Kanglaite(KLT)injection on antitumor and expression of epidermal growth factor receptor(EGFR)in Lewis lung carcinoma(LLC).METHODS:A total of 40 C57BL/6 mice were randomly divided into four groups,including model group,KLT 6.25,12.5,25 mL/kg groups.All the mice were injected with 2?106 LLC cells at 1st day.At the next day,mice in the KLT groups were peritoneally injected with KLT for 14 days.And at the 16th day,all the mice were sacrificed and the tumors were harvested.The tumor weight was measured and the tumor growth inhibition rate was analyzed.The expression of EGFR was detected by westernblot.RESULTS:The growth of LLC was significantly inhibited by KLT,the changes of tumor appearance and histology were affected and the expression level of EGFR was decreased.CONCLUSION:KLT injection could obviously inhibit the growth of LLC,whose mechanism maybe related to the inhibition of EGFR expression.