In vitro transformation by avian erythroblastosis virus recruits cells of erythroid lineage with varying degree of differentiation.

Abstract:

:We have previously shown that AEV infection of leukosis-free chickens provokes an erythroleukemia in the infected birds, and that the target cell for virus transformation is most likely an early pro-erythroblast comparable to the BFU-E. The virus infection correlates with a block in differentiation which was studied at a specific cellular gene level, namely that of the globin genes. In live birds, the viral transformation has been found to affect the transcriptional activity to two out of three adult globin genes and the phenotypic expression of the third. Indeed, the alpha A gene that is transcribed is silent as well, since its transcription product is fully eliminated in the nucleus following an "abortive processing". Chick bone marrow cells can also be transformed in vitro by AEV in which case the virus recruits, as targets, cells of the erythroid lineage belonging to a wider spectrum and hence in varying degrees of differentiation. In contrast to the results obtained with in vivo transformed cells, molecular hybridization with globin cDNA probes showed that in the erythroblasts transformed in vitro under tissue culture conditions all the three adult globin genes are transcriptionally active. In fact, low but detectable amounts of globin mRNA sequences are present in both the nuclear and cytoplasmic compartment of the cell prior to exposure to any chemical inducers of red cell differentiation. Judging from our present results, we may propose that AEV transformation in vitro does not shut off out only modulates the already functioning erythroid cell differentiation program.

journal_name

Int J Cancer

authors

Therwath A,Scherrer K

doi

10.1002/ijc.2910290511

subject

Has Abstract

pub_date

1982-05-15 00:00:00

pages

555-8

issue

5

eissn

0020-7136

issn

1097-0215

journal_volume

29

pub_type

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