Crittenden L B, McMahon S, Halpern M S, Fadly A M
J Virol. 1987 Mar;61(3):722-5. doi: 10.1128/JVI.61.3.722-725.1987.
We inoculated susceptible chicken embryos with the endogenous avian leukosis virus Rous-associated virus-0 (RAV-0) on day 6 of incubation. At 1 week after hatching, RAV-0-infected and control chickens were inoculated with either RAV-1 or RAV-2, exogenous viruses belonging to subgroups A and B, respectively. The chickens injected with RAV-0 as embryos remained viremic with exogenous virus longer and either failed to develop type-specific humoral immunity to exogenous virus or developed it later than the control chickens not inoculated with RAV-0. The RAV-0-injected chickens also developed neoplasms at a much higher frequency than did the control chickens. We suggest that the lower immune responses of the RAV-0-injected chickens were due to an immunological tolerance to envelope group-specific glycoproteins shared among endogenous and exogenous viruses.
我们在孵化第6天用内源性禽白血病病毒劳斯相关病毒0(RAV-0)接种易感鸡胚。在孵化后1周,用RAV-0感染的鸡和对照鸡分别接种RAV-1或RAV-2,这两种外源性病毒分别属于A亚群和B亚群。在胚胎期注射RAV-0的鸡对外源性病毒保持病毒血症的时间更长,要么未能产生针对外源性病毒的型特异性体液免疫,要么比未接种RAV-0的对照鸡产生得更晚。注射RAV-0的鸡发生肿瘤的频率也比对照鸡高得多。我们认为,注射RAV-0的鸡免疫反应较低是由于对内源性和外源性病毒共有的包膜组特异性糖蛋白产生了免疫耐受。