R P Bucy

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Chick-quail chimeras were used to study precursor/progeny relationships of hemopoietic stem cells (SC) that enter the embryonic thymus in waves to give rise sequentially to the TCR-1+, TCR-2+, and TCR-3+ lineages of T cells. The first wave of SC and their progeny were examined by grafting thymus from 9-d chick embryos (E9) into E3 quails. mAbs specific for(More)
Natural killer (NK) cell activity appears to be conserved throughout vertebrate development but NK cells have only been well characterized in mammals. Candidate NK cells have been identified in the chicken as cytoplasmic CD3+ and surface T cell receptor (TCR)/CD3- (TCRO) lymphocytes that often express CD8. The fact that the TCRO cells are abundant in the(More)
T helper type 0 (Th0), Th1, and Th2 CD4+ T cell clones derived from a T cell receptor alpha/beta (TCR-alpha/beta) transgenic mouse were activated by antigen presented on "artificial" antigen-presenting cells that expressed or lacked the costimulatory molecule B7-1, and were analyzed for single cell cytokine mRNA expression by in situ hybridization. There(More)
The protein synthetic machinery is activated by diverse genetic alterations during tumor progression in vivo and represents an attractive target for cancer therapy. We show that rapamycin inhibits the induction of transformed foci in vitro by GLI, a transcription factor that functions in the sonic hedgehog-patched pathway in tumors. In control cells, which(More)
Several reports support the view that growth hormone (GH) promotes proliferation and cytotoxicity by T cells in a mixed leukocyte culture (MLC). The present study was undertaken to begin to determine the mechanism of action of GH on the MLC in vitro. First, we determined that peripheral blood mononuclear cells (PBMC) cultured with mitomycin-treated(More)
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