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한국생물공학회 한국생물공학회 학술대회 생물공학의 동향(XVI)
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    For the development of new anticancer drug delivery systems which utilize acidic tumor extracellular pH (pHe, pH(7.0) for controlled release, two pH-sensitive self-assembled nanogels were designed and investigated. The pH-sensitive nanogels were prepared from the conjugates of pullulan acetate/sulfadimethoxine (PA/SDM) or pullulan/histidine (PU/His). Both nanogels showed a similar stability at pH 7.4, but showed enhanced drug release by different mechanisms at pH 6.8. PA/SDM nanogels exhibited a particle aggregation and shrinking at tumor pHe (6.8) because of the deionizion of SDM. The doxorubicin (DOX) release rate from the PA/SDM nanogel was influenced by pH around physiological pH and significantly enhanced at pH 6.8. The cytotoxicity of DOX loaded PA/SDM nanogel at pH 6.8 was comparable to that of free DOX at the same DOX concentrations, while the relative cytotoxicity at pH 7.4 was low at the teste ... 전체 초록 보기

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