[Potential oncogenic action of the RNA isolated from rat lymphosarcoma]

From the tissue of the transplantable strain of rat lymphosarcoma, using phenol technics, a total RNA (sedimentation constants 31,5S; 19,0S; 6S) and chromosome-nuclear mRNA were isolated. The preparations contained up to 10% of protein. Nucleic acids (in a dosage of 10 mg RNA) were given by single intraperitoneal injections to 2 month-old rats. The animals showed a 180% increase of the lymphatic neoplasms yield when injected both total RNA and mRNA. Transplantation into newborn rats of the rat lymphocytes, treated in vitro by the total RNA preparations, failed to yield such a significant increase in the occurrence of neoplasms. A molecular weight of RNA fragments was similar to that in the experiments on transfection by nucleic acids, isolated from tumors of viral etiology.