2011 年 8 巻 3 号 p. 188-194
The DNA/protamine complex was prepared from the reaction of high molecule weight DNA and protamine. The obtained high molecule weight DNA/protamine complex was water-insoluble white powder. The yield was 75%. The molar binding ratio (molar of protamine/ 1 base pair of DNA) DNA to protamine in was 0.129. SEM observation revealed that prepared complex had a porous structure. The porous disk could be easily prepared. In cell culture tests using MC 3T3-E1 mouse osteoblast cells, cell viabilities for the DNA/protamine complex were from 87.1% to 99.0%. In vivo test, complex showed a mild tissue response after the implantation into the back of skin of rats. The complex was gradually biodegraded during implantation, and a part of complex resided 30 days after implantation. These results suggested that high molecule weight DNA do not influence cytotoxicity and tissue response of DNA/protamine complex.