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[Immunologic reactivity of the body after laser irradiation of experimental neoplasms].

The irradiation of Garding-Passey and B16 melanomas results in an increased number of antibody-forming cells (AFC) in the spleen and an increased level in blood serum of autoantibodies against antigens of the irradiated tumor and of the liver and kidneys of the same animals, as well. Some increase of these indices was noted also in the irradiation of normal tissues.

Animals

[Bacteriocins as cytotoxic agents in experimental neoplasms: considerations on the role of possible contaminants].

In most recent papers some Authors have demonstrated that several bacteriocins are able to markedly inhibit the division of various neoplastic mammalian cell lines; also in vivo the inhibition of tumor growth or even regression relative to controls are statistically significant. Since such preparations are "crude" and it's possible that contaminating agents may represent a possible source of variability in the results, mostly in vivo; we have examined a preparation of Pyocin employed in this study for the possible endotoxin contamination using the Limulus assay. Such test was positive in triplicate and semiquantitative determination has shown and endotoxin amount of 5 to 10 microgram/ml. This level is, in vitro, not anough to give cytotoxic effect, but in vivo is able to influence experimental results. In addition, since some bacteriocins and enterotoxins are produced under exactly identical conditions, there is this a possibility that the enterotoxin are coproduced in these preparations and are causing some of the cytotoxic effects on experimental tumors. A more complete separation and purification of preparations will be required before definitive comments.

Animals

Glomerulonephritis in malignant extra-renal neoplasms. Experimental study on mice using the method of immunofluorescence.

Histologic and immunofluorescence studies were done in the murine kidneys (strain C3HAvy) suffering a spontaneous cancer of the liver. Proliferative glomerulonephritis has been found in 17 animals and memranproliferative glomerulonephritis with "wire loop" appearance in 6 animals. The glomeruli of all animals presented immune complex deposition in the mesangium and along the glomerular basement membrane. Furthermore, heavy intensity of IgG complex deposition was observed in animals with membranproliferative glomerulonephritis. The latter animals had developed a poorly differentiated liver cancer.

Animals