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Instability of Anthocyanin Accumulation in Vitis vinifera L. var. Gamay Fréaux Suspension Cultures
Wei Zhang,Junge Qu,Xingju Yu,Meifang Jin 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2
The inherent instability of metabolite production in plant cell culture-based bioprocessing is a major problem hindering its commercialization. To understand the extent and causes of this instability, this study was aimed at understanding the variability of anthocyanin accumulation during long-term subcultures, as well as within subculture batches, in Vitis vinifera cell cultures. Therefore, four cell line suspensions of Vitis vinifera L. var. Gamay Fraux, A, B, C and D, originated from the same callus by cell-aggregate cloning, were established with starting anthocyanin contents of 2.73 0.15, 1.45 0.04, 0.77 0.024 and 0.27 0.04 CV (Color Value)/g-FCW (fresh cell weight), respectively. During weekly subculturing of 33 batches over 8 months, the anthocyanin biosynthetic capacity was gradually lost at various rates, for all four cell lines, regardless of the significant difference in the starting anthocyanin content. Contrary to this general trend, a significant fluctuation in the anthocyanin content was observed, but with an irregular cyclic pattern. The variabilities in the anthocyanin content between the subcultures for the 33 batches, as represented by the variation coefficient (VC), were 58, 57, 54, and 84% for V. vinifera cell lines A, B, C and D, respectively. Within one subculture, the VCs from 12 replicate flasks for each of 12 independent subcultures were averaged, and found to be 9.7%, ranging from 4 to17%. High- and low-producing cell lines, VV05 and VV06, with 1.8-fold differences in their basal anthocyanin contents, exhibited different inducibilities to L-phenylalanine feeding, methyl jasmonate and light irradiation. The low-producing cell line showed greater potential in enhanced the anthocyanin production.
Instability of Anthocyanin Accumulation in Vitis vinifera L. var. Gamay Freaux Suspension Cultures
Qu Junge,Zhang Wei,Yu Xingju,Jin Meifang The Korean Society for Biotechnology and Bioengine 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2
The inherent instability of metabolite production in plant cell culture-based bioprocessing is a major problem hindering its commercialization. To understand the extent and causes of this instability, this study was aimed at understanding the variability of anthocyanin accumulation during long-term subcultures, as well as within subculture batches, in Vitis vinifera cell cultures. Therefore, four cell line suspensions of Vitis vinifera L. var. Gamay Freaux, A, B, C and D, originated from the same callus by cell-aggregate cloning, were established with starting anthocyanin contents of $2.73\;\pm\;0.15,\;1.45\;\pm\;0.04,\;0.7\;\pm\;0.024\;and\;0.27\;\pm\;0.04$CV (Color Value)/g-FCW (fresh cell weight), respectively. During weekly subculturing of 33 batches over 8 months, the anthocyanin biosynthetic capacity was gradually lost at various rates, for all four cell lines, regardless of the significant difference in the starting anthocyanin content. Contrary to this general trend, a significant fluctuation in the anthocyanin content was observed, but with an irregular cyclic pattern. The variabilities in the anthocyanin content between the subcultures for the 33 batches, as represented by the variation coefficient (VC), were 58, 57, 54, and $84\%$ for V. vinifera cell lines A, B, C and D, respectively. Within one subculture, the VCs from 12 replicate flasks for each of 12 independent subcultures were averaged, and found to be $9.7\%$, ranging from 4 to $17\%$. High- and low-producing cell lines, VV05 and VV06, with 1.8-fold differences in their basal anthocyanin contents, exhibited different inducibilities to L-phenylalanine feeding, methyl jasmonate and light irradiation. The low-producing cell line showed greater potential in enhanced the anthocyanin production.
Jiang Tianyi,Kustermann Stefan,Wu Xiaoqin,Zihlmann Christine,Zhang Meifang,Mao Yi,Wu Waikwong,Xie Jianxun 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.2
Background Antibiotics bear an inherent risk of mitochondrial toxicity due to the structural similarities between mitochondria and bacteria. Drug-induced mitochondrial dysfunction can contribute to organ toxicity and has resulted in a considerable number of market withdrawals. Fluoroquinolones were alerted for hepatotoxicity liability and were recently given black box warnings by FDA for the potential disabling side eff ects including tendonitis, pain in extremities and joints, neuropathies associated with paraesthesia, depression, impairment of memory, hearing, vision, etc. Objective In this study, the potential involvement of mitochondrial impairment in the toxicity of four fl uoroquinolones was investigated with a panel of mechanistic endpoints including ATP, mitochondrial respiration, as well as mitochondrial DNA and protein levels. Results Data revealed mitochondrial toxicity to diff erent extents, induced by the tested fl uoroquinolones and suggested mitochondrial protein synthesis as potential mechanism of action. Conclusion This study exemplifi es an integrated/holistic approach with a selected battery/panel of in vitro assays/endpoints serving to identify mitochondrial toxicity early on in the development of drugs, in particular, antibiotics.
Influence of burial conditions on the seepage characteristics of uranium bearing loose sandstone
Quan Jiang,Mingtao Jia,Yihan Yang,Qi Xu,Chuanfei Zhang,Xiangxue Zhang,Meifang Chen Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.4
To investigate the influence of different burial conditions on the seepage characteristics of loose sandstone in the leaching mining of sandstone uranium ore, this study applied different ground pressures and water pressures to rock samples at different burial depths to alter the rock's seepage characteristics. The permeability, pore distribution, and particle distribution characteristic parameters were determined, and the results showed that at the same burial depth, ground pressure had a greater effect on the reduction in permeability than water pressure. The patterns and mechanisms are as follows: under the influence of ground pressure, increasing the burial depth compresses the pores in the rock samples, decreases the proportion of effective permeable pores, and causes particle fragmentation, which blocks pore channels, resulting in a decrease in permeability. Under the influence of water pressure, increasing the burial depth expands the pores but also causes hard clay particles to decompose and block pore channels. As the burial depth increases, the particles eventually decompose completely, and the permeability initially decreases and then increases. In this experiment, the relationships between permeability and the proportion of pores larger than 0.15 ㎛ and the proportion of particles smaller than 59 ㎛ were found to be the most significant.