Summary
Immune RNA (I-RNA) was extracted from lymphoid organs of BALB/c mice immunized with AKR lymphoid cells. Incubation of normal BALB/c spleen cells with this I-RNA (but not with normal RNA) resulted in leukocyte migration inhibition reactions (LMIR) against AKR extracts but not against purified protein derivative or BALB/c sarcoma extracts. This transfer was abolished by pretreating I-RNA with RNAse but not with pronase. The active fraction of I-RNA was retained by and could be eluted from Poly-U Sepharose columns. Normal cells pretreated with I-RNA also reacted in the presence of an anti-idiotypic anti-serum of anti-(BALB/c anti-AKR) specificity. Pretreatment of cells with anti-idiotypic serum plus complement did not inhibit the subsequent transfer of LMIR with I-RNA. Idiotypic receptors were expressed on I-RNA treated cells less than one hour after I-RNA treatment. Using an I-RNA of double specificity, the results suggested that I-RNA entered into and acted on the cells through a nonspecific mechanism. Finally, I-RNA could induce BALB/c anti-AKR idiotypic markers in C57B1/6 cells, genetically committed for different idiotypes, while RNA extracted from C57131/6 immune cells could not induce in BALB/ c cells their own genetically acquired idiotypes. This series of data would prove that I-RNA acting as a mRNA is able to induce in normal noncommitted cells the de novo synthesis of antigen receptors similar or identical to those present in the surface of in vivo immunized lymphoid cells of the same strain.
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Satz, M.L., Sztein, M.B., Serrate, S. et al. Mechanism of immune transfer by RNA extracts. Mol Cell Biochem 33, 105–113 (1980). https://doi.org/10.1007/BF00225282
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DOI: https://doi.org/10.1007/BF00225282