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Northern (RNA) analyses were used to study the kinetics of induction of endogenous mink cell focus-forming (MCF) and xenotropic murine leukemia virus (MuLV)-related sequences in NFS and C57BL/6 mice injected with the polyclonal immune activators lipopolysaccharide (LPS), concanavalin A, and 8-bromoguanosine. All three mitogens induced 8.4-, 7.2-, 3.0-, and 1.8-kilobase (kb) MCF-related transcripts coordinately in the spleens of injected mice. Xenotropic MuLV-related expression was also rapidly induced in spleens by the three polyclonal immune activators, but in a noncoordinate manner: a distinct set of transcripts with different kinetics of expression was induced by each mitogen. MCF-related induction after LPS injection was both rapid and sustained; it began within 30 min and persisted for at least 8 days in the spleens of both NFS and C57BL/6 mice. LPS also caused prolonged induction of xenotropic transcripts in spleens of C57BL/6 but not NFS mice. The gld mutation, which causes polyclonal immune activation, induced 8.4-, 10.0-, and 13-kb MCF-related transcripts in C3H/HeJ mice without altering expression of 7.2-, 5.6-, 4.0-, 3.0-, or 1.8-kb MCF-related transcripts. The data demonstrate that individual endogenous MuLV-related transcripts can be induced coordinately or independently and suggest that expression of these transcripts is linked to early stages of lymphocyte activation.

Multiple endogenous xenotropic and mink cell focus-forming murine leukemia virus-related transcripts are induced by polyclonal immune activators