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1 Progress in Modern Biomedicine 2009 Vol.9 No.1 5 MG-63 * MG-63 1μmol/L MG-63 MG-63 7 MG % G0/G % c-myc c-fos Rb p27 1μmol/L c-myc c-fos Rb p27 :MG-63 Q254, Q279 A Effects of Retinoic Acid on Proliferation and Associated Gene Expression of Human Osteosarcoma MG-63 Cells* SONG Jian-ye, ZHAO Yan, Li Qi-Fu, SHI Song-lin, ZHAO Zhen-li, JING Guang-jun Laboratory of Cell Biolog, School of Life Sciences, Xiamen University, Xiamen, , China ABSTRACT Objective: To explore effect of Retinoic Acid (RA) on proliferation of human osteosarcoma MG-63 cells and its mechanism of antitumor. Methods: The MG-63 cells treated by 1μmol/L RA were subjected to growth curve counts, flow sytometry, immuncocytochemical assay and light microscopy. We investigated the influence of RA on proliferation, cell cycle, expression of associated oncogene and tumor suppressor gene of MG-63 cells. Then we analyzed the mechanism of RA in inducing differentiation primarily. Results: Seven days after treated by 1 μmol/l RA, the inhibition rate of proliferation of MG-63 cells amounted to 42.2 % and RA reduced the rate of progression from G1 to S phase. The cells tend to be flat and spread. Meanwhile, the expression level of oncogene was downregulated and the expression level of tumor suppressor gene was upregulated. Conclusions: 1μmol/L RA could inhibit proliferation of MG-63 cells, reverse the malignant phenotype characters, downregulate expression of Oncogene c-myc, c-fos and upregulate expression of Tumor Suppressor Gene Rb, p27, as a result, induce MG-63 cells into differentiation effectively. Key words: Human Osteosarcoma Cell MG-63; RA; Proliferation; Oncogene; Tumor Suppressor Gene Chinese Library Classification: Q254,Q279 Aticle ID: Document code: A HMBA [2-3] MG-63 retinoic acid RA MG-63 MG [1] MG-63 * Tel songjye123@163.com chifulee@xmu.edu.cn

2 6 Progress in Modern Biomedicine 2009 Vol.9 No.1 RPMI % 100 U/ml 100 ug/ml 50 ug/ml PH MG retinoic acid RA MG-63 Sigma 1 mmol/ml 0.22 μm /ml 4 MG-63 RA /ml 15.6 RA RA /ml 9 1μmol/L MG /ml Table 1 The effect of RA on inhibition of the proliferation of MG-63 cells 2 ml 25 ml h 10 4 /ml group/date 1μmol/L RA Inhibition rate C RA RA Trypan Blue / 42.2 % /ml 24 h 1μmol/L RA 7 d PBS ml PBS 5 ml 70 % 0.1M PBS 3 DNase 100 μg/ml RNaseA PBS 0.5 ml min RNA 50 ug/ml (PI) 4 30 min 1 MG-63 Fig. 1 The effect of RA on the proliferation of human osteosarcoma 1.4 MG-63 cells 1μmol/L RA 5 d /ml RA MG h PBS 2-3 MG-63 G 0 /G % Bouin-Hollande 70 % HE RA G 0 /G % Olympus BH-2 S G2/M 1.5 c-myc c-fos Rb p27 2 MG-63 RA 37 PBS 4 20 min PBS 3 % H 2 O RA MG % Table 2 The influence of RA on the cell cycle of MG-63 Group G 0 /G 1 (%) S(%) G2/M(%) 10 min 2 %BSA 25 min Control c-myc c-fos Rb P27 c-myc RA c-fos P27 Rb 4 PBS 2.2 RA MG-63 IgG/Bio min PBS HE MG-63 SABC min DAB 5-20 min 1-2 min Olympus BH-2 3-5

3 Progress in Modern Biomedicine 2009 Vol.9 No RA p p27 HE μmol/l RA MG-63 % MG-63 Fig. 2 The influence of RA on the cell cycle of MG-63 cells G 0 /G % DNA S G 2 /M 3 4 MG-63 RA MG-63 (HEⅹ400) Fig. 3, 4 MG-63 cells before and after RA treatment (HEⅹ400) 2.3 MG-63 c-myc c-fos RA MG-63 c-fos c-myc c-myc MG-63 c-myc c-fos 5 RA c-myc Rb p27 RA MG-63 c-myc c-fos Rb p27 6 HMBA MG-63 [2] c-fos MG-63 p21cip1/waf1 7 RA [12] α-synuclein MG-63 c-fos p21 Rb 8 [13] U-937 c-myc 2.4 MG-63 Rb p27 p27 [4,5] S MG % RA MG-63 G 0 /G % S G2/M S 14.4 % G 2 /M 23.8 % HMBA [2] MG-63 A TEI-6363 t, t [6-9] FTC-133 SAC B2 Eca109 U-937 [10-11] G0/G1 1 μmol/lra MG-63 G 0 /G 1 cyclin E p21waf1/cip1 p27kip1 [11] c-myc c-fos RA MG-63 [14] mrna Rb p27 Rb [15] p21 p27 1μmol/LRA MG-63 9 RA MG-63 c-myc c-fos Rb p27

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