Objective To explore the effect of gene NDRG2 (N-myc downstream regulated gene 2) transfection on the proliferation and apoptosis of breast cancer cell. Methods Bcap37 cell line expressing low level product encoded by NDRG2 gene is transfected with recombinating adenovirus expressing high level NDRG2 gene product to improve NDRG2 gene expression level. NDRG2 expression was detected by Western blot and the proliferation activity of the cell lines was detected by MTT and flow cytometry. Results High level expression of NDRG2 inhibits cells growth and results in G_1 phase arrest in Bcap37 cell line. Compared with non-transfected Bcap37 cells and Bcap37 cells transfected by empty vector, apoptosis cells obviously increase in Bcap37 cell line transfected by recombinating adenovirus expressing high level NDRG2 gene, 12% after 48 hours and 21. 5% after 72 hours. Conclusion Overexpres-sion of NDRG2 in Bcap37 cells effectively inhibites cell proliferation and induces cell cycle arrest and apoptosis.

Objective To explore the effect of gene NDRG2(N-myc downstream regulated gene 2) transfection on the proliferation and apoptosis of breast cancer cell.Methods Bcap37 cell line expressing low level product encoded by NDRG2 gene is transfected with recombinating adenovirus expressing high level NDRG2 gene product to improve NDRG2 gene expression level. NDRG2 expression was detected by Western blot and the proliferation activity of the cell lines was detected by MTT and flow cytometry. Results High level expression of NDRG2 inhibits cells growth and results in G1 phase arrest in Bcap37 cell line. Compared with non-transfected Bcap37 cells and Bcap37 cells transfected by empty vector,apoptosis cells obviously increase in Bcap37 cell line transfected by recombinating adenovirus expressing high level NDRG2 gene,12% after 48 hours and 21.5% after 72 hours. Conclusion Overexpression of NDRG2 in Bcap37 cells effectively inhibites cell proliferation and induces cell cycle arrest and apoptosis.

Objective To investigate antibiotic resistance and resistant trend of Streptococcus pneumonia. Methods To investigate 753 Streptococcus pneumoniae isolated from Tongji Hospital in recent 10 years from January 1st 2000 to December 31st 2009, most of them were from respiratory tract specimens,followed by blood and cerebrospinal fluid. The MIC to penicillin & cefatriaxone were determined by E-test,and other antimicrobial susceptibility were tested by Kirby-Bauer method. Results For non-cerebrospinal fluid specimen, the total rate of PNSSP was 23.8%( 93/392 ), it was significant different between the rate of PNSSP from children ( 26. 4%, 47/178 ) and adults ( 16. 8%, 36/214, χ2 = 7. 642, P ＜ 0. 01 ). All of 10 strains isolated from cerebrospinal fluid were PRSP. Most isolates were high-susceptive to moxifloxacin and levofloxacin, and the rate of susceptibility were 96. 9% ( 720/743 ) and 90. 5% ( 672/743 )respectively. None of Streptococcus pneumonia was resistant to vancomycin and meropenam. The resistant rate of most tested antibiotics increased in different degree year by year, especially penicillin, erythromycin and clindamycin. The rate of PNSSP was only 19%( 19/99 )in 2006 ,but in 2009 the rate increased to 30%( 35/114 ). The susceptibility rate of erythromycin was 22% ( 28/125 )in 2000, but only 3% ( 3/114 )in 2009 ;and the susceptibility rate of clindamycin decreased from 40% ( 13/32 ) in 2004 to 4% (5/114) in 2009. Conclusions From 2000 to 2009, Streptococcus pneunoniae was more likely resistant to penicillin,erythromycin and clindamycin year by year, especially those isolates recovered from children. It was suggested that antibiotics should be chosen to use according to antimicrobial susceptibility test results.