EFFECTS OF APATITE CERAMICS ON CELL GROWTHS AND DNA SYNTHESES IN HUMAN OSTEOBLAST LIKE CELL

Sintered strontium hydroxyapatite (Sr-HAP) and hydroxapatite (HAP) werekinds or apatite ceramics as substitutes of bone tissues.They should be safety to human body.Sr-HAP and HAP were co-cultured with human osteoblast like cells for 2, 4,and 6 days invitro. Effect of Sr-HAP and HAP on cell growth numbers with thymidine incorporationtest. In order to estimated cytotoxicities of materials,relative cell growth rate (RGR) werecalculated from data and score of cytotoxicties were assaied. Results showed cell growth numbers and rate of 3H-thymidine incorporation in Sr-HAP and HAP groups were the same asthat of blank control group. Values were increased with the increase of co-cultured time.There were no inhibition of cell growth and DNA syntheses in human osteoblast like cells. Accoding to RGR and score of cytotoxicity degree,all values were qurlified with sdandard ofbiomaterials. Results suggested these qurlified with sdandard or biomaterials. Results suggested these apatite ceramics had no obvious cytotoxicities.

UO_2^(2+)对某些细胞毒性的初探

建立了由多种金属离子和小分子配体组成的多相细胞液热力学平衡模型,模拟研究了UO22+在组织液和细胞液的形态。体外培养了SD大鼠成骨细胞和人肾小管上皮细胞,通过体外细胞生长抑制实验探索了UO22+对成骨细胞及肾小管上皮细胞的毒性。研究表明,在细胞液中,当各形态UO22+物质总浓度[U]=8.4×10-6mol/L时,当pH为6.0～6.5时,UO22+主要以固相(UO2)3(PO4)2存在,当pH为6.8～7.5时,UO22+主要以水溶性[UO2(CO3)3]4-存在;当[U]=1.3×10-3mol/L时,在整个细胞液pH范围内,固相(UO2)3(PO4)2占主导地位。体外细胞生长抑制实验表明,UO22+对成骨细胞的生长具有抑制作用,能显著降低肾小管上皮细胞的存活率,具有明显的细胞毒性。