The hallmark of apoptosis, in suspension cultures of Taxus spp. cells induced by fungal extractive or by abiotic means, was studied by total DNA agarose gel electrophoresis and in situ end-labeling. The cleavage of nu...The hallmark of apoptosis, in suspension cultures of Taxus spp. cells induced by fungal extractive or by abiotic means, was studied by total DNA agarose gel electrophoresis and in situ end-labeling. The cleavage of nuclear DNA (nDNA) into oligonucleosomal fragments(DNA laddering) was a characteristic of apoptosis, which involved cell shrinkage, condensation of cytoplasm and tracheary elements differentiation. Terminal deoxynucleotidy transferase-mediated dUTP nick end in situ labeling (TUNEL) assay of Taxus spp. cells showed that fungal extractive or abiotic elicltors (Ce4+, Taxol, H2O2) induced TUNEL positive. Also, the increase of the apoptotic cell ratio was accompanied by the increase of secondary metabolites (especially Taxol). These results suggest that apoptosis may have some coincidence with biosynthesis of Taxol. The implication of apoptosis for the production of secondary metabolites in plant cell cultures is discussed.展开更多
Taxol is a unique antitumor drug that appears to exert its activity as a result of interference with microtubular structure and function. The Taxol solubility of in methanol, ethanol and methanol-water was measured by...Taxol is a unique antitumor drug that appears to exert its activity as a result of interference with microtubular structure and function. The Taxol solubility of in methanol, ethanol and methanol-water was measured by the equilibrium method in this paper. The data obtained were correlated by the regress equation and ANN model. The results showed that the both were in excellent agreement with the experimental data and the ANN model was more convenient than the regress equation.展开更多
文摘The hallmark of apoptosis, in suspension cultures of Taxus spp. cells induced by fungal extractive or by abiotic means, was studied by total DNA agarose gel electrophoresis and in situ end-labeling. The cleavage of nuclear DNA (nDNA) into oligonucleosomal fragments(DNA laddering) was a characteristic of apoptosis, which involved cell shrinkage, condensation of cytoplasm and tracheary elements differentiation. Terminal deoxynucleotidy transferase-mediated dUTP nick end in situ labeling (TUNEL) assay of Taxus spp. cells showed that fungal extractive or abiotic elicltors (Ce4+, Taxol, H2O2) induced TUNEL positive. Also, the increase of the apoptotic cell ratio was accompanied by the increase of secondary metabolites (especially Taxol). These results suggest that apoptosis may have some coincidence with biosynthesis of Taxol. The implication of apoptosis for the production of secondary metabolites in plant cell cultures is discussed.
文摘Taxol is a unique antitumor drug that appears to exert its activity as a result of interference with microtubular structure and function. The Taxol solubility of in methanol, ethanol and methanol-water was measured by the equilibrium method in this paper. The data obtained were correlated by the regress equation and ANN model. The results showed that the both were in excellent agreement with the experimental data and the ANN model was more convenient than the regress equation.
