引起成人腹泻的新轮状病毒在原代人胚肾细胞上的培养和传代

目的 探讨用细胞培养系统在体外培养新轮状病毒（RV）。方法 含新RV的病人粪便标本经高浓度胰蛋白酶（100μg/ml)37℃作用1h,接种于原代人胚肾（PHEK）细胞,37℃吸附1h后,补加无血清含胰蛋白酶（100μg/ml）的DMEM,37℃转鼓培养3d,收获细胞培养液,冻融1次,作为下一代培养的接种物,培养传代。用聚丙烯酰胺凝胶电泳、免疫荧光（IF）、电镜（EM）、免疫电镜（IEM）等方法对细胞培养液进行病毒核酸、抗原及形态检查。结果 从10份粪便标本中培养分离到1株病毒,定名为J19。该病毒在PHEK细胞上稳定培养传代（28代）,其病毒核酸（dsRNA）电泳图型与初始用于接种细胞的粪便标本中的dsRNA电泳图形完全一致,而与A、B、C组RV dsRNA电泳图型明显不同。J19株感染的细胞与病人恢复期血清呈IF阳性反应,与成人腹泻轮状病毒（ADRTV）腹泻病人恢复期血清、兔抗A组RV和兔抗ADRV血清均为IF阻性;EM和IEM在该病毒的细胞培养液中观察到,在形态上与初始接种物中病毒一样的轮状病毒颗粒,而且可被新RV腹泻病人恢复期血清凝集,结论 成功地从含新RV的成人腹泻粪便标本上分离培养出1株轮状病毒－－J19,并能在细胞稳定传代。J19株不属于A、B、C组RV,而是一种新RV。关于新RV在细胞上培养传代,本文是第一次报告。

Cultivation and serial propagation of a new rotavirus causing adult diarrhea in primary human embryo kidney cells

OBJECTIVE: To investigate the methodology of cultivation of the new rotavirus that causes adult diarrhea. METHODS: 10% suspension of new rotavirus positive stool specimens in DMEM with 100 microgram/ml trypsin was made and centrifuged at the speed of 3 000 rpm for 10 minutes. The supernatant was filtered with 0.45 micrometer-pore-sized membrane filter, and the filtrate was incubated at 37 degrees C for 60 minutes. Primary human embryo kidney (PHEK) cells were prepared and seeded into roller tubes at the concentration of 1 ml odf cell suspension per tube. At 1 hour prior to inoculation, the PHEK cells were rinsed and refed with serum-free DMEM. Immediately before inoculation, the DMEM was decanted, and 200 microliter of prepared filtrate was inoculated into each tube. The tubes were incubated at 37 degrees C for 1 hour. At the end of 1 hour 800 microliter of DMEM containing trypsin (100 microgram per ml) were added to each tube. The tubes were placed in a roller tube apparatus at 37 degrees C for 3 days, removed and frozen-thawed once. 200 microliter of the cell culture fluids (CCF) were used for inoculation of each tube for next virus passage. Detection of new rotavirus from CCF was carried out by PAGE, IF, EM and IEM. RESULTS: New rotavirus was successfully isolated in cultured cells from 1 of 10 specimens. The isolated virus, designated J19, was propagated in PHEK cells for 28 passages. RNA patterns of J19 strain were identical to that of original new rotavirus inoculum and different from that of group A, B, C rotavirus. PHEK cells infected with the J19 strain were detected by IF. Infected cells reacted with convalescent antisera to the new rotavirus, but did not react with convalescent antisera to ADRV and hyperimmune antisera against group A, B rotavirus. Rotavirus particles were detected by EM, IEM in infected CCF of J19 strain. Other viral particles were not observed. The particles were aggregated with convalescent antisera to new rotavirus. CONCLUSION: We were successful in adapting a new rotavirus to serial propagation in PHEK cells. The J19 strain is a kind of new rotavirus different from group A, B, C rotavirus. This is the first report on the cultivation and propagation of the new rotavirus in cultured cells.