The cellular cancer resistance of the SR/CR mouse - PubMed

The cellular cancer resistance of the SR/CR mouse

Janne Koch et al. APMIS. 2012 Dec.

Abstract

The SR/CR mouse phenotype, first described in 1999 in BALB/c and later bred into C57BL/6 mice, is resistant to cancer formation following high doses of cancer cells administered intraperitoneally. The tumor cell targeting and destruction mechanisms have not been identified. By fluorescence-activated cell sorting analysis, the immune response of SR/CR mice after intraperitoneal injection of cancer cells was investigated and compared with parent strain mice. A massive influx of leukocytes into the peritoneal cavity was found. A large fraction of these leukocytes were polymorphonuclear granulocytes, macrophages and natural killer cells. A relative decrease in influx of B-cells compared with controls was demonstrated. Increased proportions of leukocytes belonging to the innate immune system were also demonstrated in splenocytes of SR/CR mice. Cytospins of peritoneal fluid from SR/CR mice after cancer cell injection showed formations of immune cells morphologically resembling polymorphonuclear granulocytes and macrophages adjoining the cancer cells. The results point to the potential involvement of innate immune cells in cancer immunology. Our data support migration of polymorphonuclear granulocytes, macrophages and NK cells into the peritoneum of the SR/CR mouse in response to intraperitoneal injection of S180 cancer cells. The cell composition of spleens of SR/CR mice reflected the differential regulation of the innate immune cells in peritoneal exudates. Both peritoneal exudates and the spleens of SR/CR mice contained decreased proportions of B-cells compared with BALB/c and C57BL/6 mice. We reproduce important aspects of previous published data and further extend them by showing differentially regulated populations of splenocytes including B-lymphocytes in SR/CR mice compared with parent strain controls. Importantly, this differentially regulated immune response of SR/CR mice could not be found in response to challenge with the lymphoma cell line EL-4.

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