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A cDNA sequence coding for a unique mouse interleukin that expresses B-cell-, T-cell, and mast-cell-stimulating activities has been isolated from a mouse helper T-cell cDNA library. The library, constructed in the pcD expression vector, was screened by transfecting COS monkey cells with DNA pools to express the products encoded by full-length cDNA inserts.(More)
Our studies show that although interleukin 4 (IL-4) fails to stimulate significant colony formation by bone marrow progenitor cells, it enhances erythroid, granulocyte, macrophage, and mast-cell colony formation when used as a costimulant with erythropoietin, granulocyte colony-stimulating factor, macrophage colony-stimulating factor, and interleukin 3(More)
Murine mast-cell and T-cell growth factor activities, distinct from interleukins 3 and 2 (IL-3 and IL-2), have been identified and partially purified from the supernatant of the activated helper T-cell line Cl.Ly1+2-/9. This mast-cell growth factor (MCGF) activity supports only low levels of proliferation of several IL-3-dependent mast-cell lines and(More)
The findings presented in this study provide evidence that BSF1 receptors and mIg transmit signals via dissimilar transduction mechanisms that result in a common biologic response, hyper-Ia expression. Specifically, BSF1-containing supernatant does not induce PtdInsP2 hydrolysis as determined by measurement of PtdOH and InsP3. Additionally, BSF1 does not(More)
Two murine mAb have been generated with a reactivity toward a 30,000 m.w. DNA binding protein found on the cell surface of human leukocytes; mAb 12A has an IgG1/k isotype, and mAb 24T has an IgG2b/k isotype. Both react with the DNA binding domain or adjacent region of the putative DNA receptor and inhibit the binding of [3H]DNA to PBMC at concentrations as(More)
Influenza viral infections often lead to increased mortality in older people. However, the mechanisms by which aging impacts immunity to influenza lung infection remain unclear. We employed a murine model of influenza infection to identify these mechanisms. With aging, we found reduced numbers of alveolar macrophages, cells essential for lung homeostasis.(More)
An increasing number of older people receive organ transplants for various end-stage conditions. Although organ transplantation is an effective therapy for older patients (i.e., older than 65 years of age), such as in end-stage renal disease, this therapy has not been optimized for older patients because of our lack of understanding of the effect of aging(More)
We have characterized the activation of the interleukin 1 (IL-1)-responsive T-cell lymphoma LBRM33-1A5-47 to interleukin 2 (IL-2) production by phytohemagglutinin (PHA) and IL-1. The signal provided by soluble IL-1 could be replaced by fixed P388D1 cells and the signal provided by PHA by a monoclonal antibody directed against an allotypic determinant of the(More)
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