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Spontaneous regression/complete resistance (SR/CR) mice are a unique colony of mice that possess an inheritable, natural cancer resistance mediated primarily by innate cellular immunity. This resistance is effective against sarcoma 180 (S180) at exceptionally high doses and these mice remain healthy.
Spontaneous Regression/Complete Resistant (SR/CR) mice are a colony of cancer-resistant mice that can detect and rapidly destroy malignant cells with innate cellular immunity, predominately mediated by granulocytes. Our previous studies suggest that several effector mechanisms, such as perforin, granzymes, or complements, may be involved in the killing of cancer cells. However, none of these effector mechanisms is known as critical for granulocytes. Additionally, it is unclear which effector mechanisms are required for the cancer killing activity of specific leukocyte populations and the survival of SR/CR mice against the challenges of lethal cancer cells. We hypothesized that if any of these effector mechanisms was required for the resistance to cancer cells, its functional knockout in SR/CR mice should render them sensitive to cancer challenges. This was tested by cross breeding SR/CR mice into the individual genetic knockout backgrounds of perforin (Prf-/-), superoxide (Cybb-/), or inducible nitric oxide (Nos2-/).
Use of the antibody trastuzumab to kill HER2+ breast cancer cells is an attractive therapy because of its specificity and minimal adverse effects. However, a large fraction of HER2+ positive patients are or will become resistant to this treatment. No other markers are used to determine sensitivity to trastuzumab other than HER2 status.Using the xCELLigence platform and flow cytometry, we have compared the ability of mononuclear cells (MNCs) from normal and breast cancer patients to kill different breast cancer cell lines in the presence (i.e., ADCC) or absence of trastuzumab. Image analysis and cell separation procedures were used to determine the differential contribution of immune cell subsets to ADCC activity. The assay demonstrated that ADCC activity is dependent on the presence of trastuzumab, the level of HER2 expression on the target, and the ratio of MNCs to tumor cells. There is a wide range of ADCC activity among normal individuals and breast cancer patients for high and low HER2-expressing tumor targets. Fresh MNCs display higher ADCC levels compared with cryopreserved cells. Natural killer cells display the highest ADCC followed by monocytes. T cells and B cells were ineffective in killing. A major mechanism of killing of tumor cells involves insertion of granzyme B and caspase enzymes via the antibody attached MNCs.
Spontaneous Regression/Complete Resistant (SR/CR) mice are resistant to cancer through a mechanism that is mediated entirely by leukocytes of innate immunity. Transfer of leukocytes from SR/CR mice can confer cancer resistance in wild-type (WT) recipients in both preventative and therapeutic settings. In the current studies, we investigated factors that may impact the efficacy and functionality of SR/CR donor leukocytes in recipients.
Nonhuman primates have similar shoulder anatomy and physiology compared to humans, and may represent a previously underutilized model for shoulder research. This study sought to identify naturally occurring bony and muscular degeneration in the shoulder of nonhuman primates and to assess relationships between structural and functional aspects of the shoulder and measures of physical function of the animals. We hypothesized that age-related degenerative changes in the shoulders of nonhuman primates would resemble those observed in aging humans.
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