The 19-base-pair enhancer repeat of the human cytomegalovirus immediate-early 1 gene mediates cyclic AMP- and phytohemagglutinin-induced expression in Jurkat T cells. Synergistic activity was observed in the presence of both drugs, suggesting a convergence of the protein kinase A and C pathways on this transcription element. In addition, the immunosuppressive drug cyclosporine strongly reduced ...

Trypsin treatment of human erythrocytes releases a soluble glycopeptide which binds to phytohemagglutinin and abolishes the erythroagglutinating and lymphocyte-stimulating properties of this molecule. The glycopeptide has been purified by alkaline borohydride treatment, proteolytic digestion, gel filtration, and DEAE-cellulose chromatography. The most highly purified glycopeptide has a molecula...

One of the auto-antigens aberrantly targeted in Multiple sclerosis is myelin basic protein (MBP). In this study, chronic progressive multiple sclerosis (CPMS) patients receiving the experimental drug MBP8298, on a compassionate care trial, were examined before and after high dose peptide treatment for their circulating regulatory T-cell numbers and their responses to the common mitogens, phytoh...

The capacity of human cells to modulate the synthesis of DNA repair enzymes has been investigated by measuring the induction of the uracil-DNA glycosylase during lymphocyte stimulation. Treatment of peripheral lymphocytes with phytohemagglutinin increased glycosylase activity 10-fold. Glycosylase stimulation was coordinate with the activation of DNA synthesis and DNA polymerase activity. Two ch...

Human peripheral blood lymphocytes were cultured in several concentrations of each of several cephalosporins. Responses to phytohemagglutinin were compared with that of duplicate cultures containing penicillin-streptomycin, chloramphenicol, or no antibiotics. Possible effects of cephalosporins on responses of lymphocytes to concanavalin A and pokeweed mitogen were similarly determined. Signific...

The diagnosis of hairy cell leukemia was made in three patients by phase-contrast microscopy and histochemistry of the abnormal peripheral blood cells. Both IgM and IgD surface immunoglobulins were resynthesized after these cells were trypsinized and cultured. Aggregate or Fc receptors were demonstrated on hairy cells. The ability to phagocytose latex was also a property of hairy cells; however...

The mitogenic responsiveness of spleen cells obtained from avian sarcoma virus-inoculated Fischer 344 rats was studied. Sixty % of the rats had astrocytomas, 13% had sarcomas, 7% had mixed gliosarcomas, and 20% had no evidence of tumors. Only spleen cells from rats bearing astrocytomas had significantly diminished responses to phytohemagglutinin and concanavalin A (Con A) when compared to contr...