1887

Abstract

We have used antibiotic-resistant retrovirus vectors rescued by -sensitive murine leukaemia viruses (MuLV) to examine the phenotype of two undifferentiated embryonal carcinoma (EC) cell lines derived from teratocarcinomas of mouse strain 129. In addition, a set of EC cell-derived differentiated cell lines was analysed. Restriction of both B-tropic and endogenous N-tropic virus is characteristic of the N-type restriction reported in mouse strain 129. However, results indicate that restriction is not expressed in the PCC4.aza1R EC cell line. In contrast, the F9 EC cell line showed a strong restriction of the B-tropic pseudotyped vector but failed to restrict endogenous N-tropic pseudotypes. The gene thus seems to be differentially expressed in two EC cell lines derived from the same mouse strain. Furthermore, the selective restriction of B-tropic but not endogenous N-tropic MuLV in F9 cells suggests that these activities function independently of each other. Analysis of PCC4.aza1R-derived differentiated cell lines revealed that three fibroblast cell lines derived by retinoic acid-induced differentiation were also phenotypically silent for . However, a pre-adipocyte line established following simultaneous exposure to retinoic acid and 5-azacytidine showed strong restriction of both B-tropic and endogenous N-tropic MuLV. Although additional data suggest that there is no correlation between the differentiated pre-adipocyte phenotype and expression, our results nonetheless show that N restriction can be observed in some derivatives of PCC4.aza1R cells, presumably by activating expression of the gene.

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/content/journal/jgv/10.1099/0022-1317-72-3-609
1991-03-01
2019-10-15
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http://instance.metastore.ingenta.com/content/journal/jgv/10.1099/0022-1317-72-3-609
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