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Establishment, Growth kinetics, and Susceptibility to AcMNPV of Heat Tolerant Lepidopteran cell lines

Virologica Sinica 2011年第3期26卷 198-205页

作者： Yan-lei WU Lei Jiang Yoshifumi Hashimoto Robert R. Granados Guo-xun Li The Center for Advanced Invertebrate cell Engineering Collaboration with BTI USA Qingdao AgriculturalUniversity Qingdao 266109 China＇~ Boyce Thompson Institute for Plant Research at Cornell University Ithaca NY 14853 USAJ

Lepidopteran heat-tolerant (ht) cell lines have been obtained with sf-9, sf-21 and several Bombyx cells. They have a distinct karyotype, membrane lipid composition, morphology and growth kinetics from the parental cell lines. In this paper, we report the development of ht cell lines from other insect species and examination of their growth characteristics and virus susceptibility. Adaptation of cell lines sf-9, BTI-TN-5B1-4 (High5) and BTI-TN-MG1 (MG1) to 33℃ and 35℃ was carried out by shifting the culture temperature between 28℃ and higher temperatures by a gradual stepwise increase in temperature. The process of adaption to a higher culture temperature was accomplished over a period of 2 months. The cell lines with the temperature adaption were designated as sf9-ht33, sf9-ht35, High5-ht33, High5-ht35, MG1-ht33, MG1-ht35. These cell lines have been subcultured over 70 passages. Adaption to high temperatures was confirmed by a constant population doubling time with individual cell lines. The population doubling time of heat adapted cell lines were 1-4 h less than these of parental cell lines. cell shapes did not show obvious change, however, the cell size of sf9-ht cells was enlarged and those of High5 and MG1 ht cells were reduced after heat adaption. When the cell lines were infected with Autographa californica nuclear polyhedrosis virus (AcMNPV) at 28℃, 33℃, 35℃ and 37℃, production of budded virus and occlusion bodies in each cell line was optimum at its own adapted temperature.

关键词： Heat-tolerant cell lines Susceptibility of virus Production of virus Growth curves insect cell lines

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