Experimental salmonellosis. VII. In vitro transfer of cellular immunity by ribosomal fraction of mouse mononuclear phagocytes

Sato, Ichiei (Gunma University, Maebashi, Japan), and Susumu Mitsuhashi. Experimental salmonellosis. VII. In vitro transfer of cellular immunity by ribosomal fraction of mouse mononuclear phagocytes. J. Bacteriol. 90:1194-1199. 1965.-The mononuclear phagocytes (termed monocytes) of mice hyperimmunized with live vaccine of Salmonella enteritidis inhibited the intracellular growth of virulent strain 116-54 of S. enteritidis. Also, the monocytes withstood the degeneration of cells caused by the phagocytosis of bacteria in the absence of immune serum in the tissue culture medium, termed cellular immunity. When the nonimmune monocytes were incubated with the ribosomal fraction of immune monocytes, obtained from the abdominal cavity of mice hyperimmunized with live vaccine of S. enteritidis, they acquired cellular immunity, but the monocytes did not acquire immunity when ribosomal fractions from normal mouse monocytes or from the monocytes of mice immunized with killed vaccine of S. enteritidis were used. The transfer agent present in the ribosomal fraction of immune monocytes was inactivated by treatment with ribonuclease but not with deoxyribonuclease or with trypsin.

Enhancement of Growth of Chick Host Spleens following Chorio-allantoic Membrane Grafts of Homologous Tissues1

The phenomenon of enlargement of the host chick embryo spleen, following grafts of homologous adult chicken tissues to the chorio-allantoic membrane (CAM), affords the investigator an excellent tool for the study of growth.

Initial observations of this phenomenon were made by Danchakoff (1916) and Murphy (1916). Grafts of adult chicken spleen on the chorio-allantoic membrane of 9-day-old chick embryos brought about a striking enlargement of the host spleens after 8 additional days of incubation. The phenomenon was later studied by Ebert (1951), who showed that the effect was only partially organ-specific. Grafts of thymus and liver affected the weight of the host spleen, but in each case the effect was far smaller than that observed with splenic transplants. Andres (1955) found that injected kidney and liver debris, which elicited an increased mitotic index in the homologous host organ, was not inhibited in its action by killing the cells through freezing and subsequent thawing.