Induction of surface antigen CD69 expression in T-lymphocytes following exposure to actinomycin D.

The expression of surface antigen CD69 in immune response cells is typically associated with the early stage(s) of cell activation, with maximal expression levels within 4 h of appropriate antigenic or mitogenic stimulation, and maintenance of these high expression levels for 18-24 h. The expression profiles of CD69 in human peripheral blood mononuclear cells (PBMC) cultured with actinomycin D prior to mitogenic stimulation were evaluated by direct immunofluorescence using flow cytometry. Pretreatment of PBMC suspensions with low, non-toxic levels of actinomycin D stimulated CD3+ T-lymphocytes to express CD69 in a concentration-dependent manner.

Immunophenotypic characterization of tumor infiltrating lymphocytes and peripheral blood lymphocytes isolated from melanomatous and non-melanomatous Sinclair miniature swine.

Selectively-bred Sinclair miniature swine exhibit a high incidence of congenital malignant melanoma which either proves fatal (10-15% of tumor-bearing piglets) or spontaneously regresses with a biphasic immunological phenomenon (85-90%) and no recurrence of malignancy. Mononuclear leukocytes were isolated from cutaneous melanomas and peripheral blood specimens collected from melanomatous (tumor-bearing) Sinclair swine during second-phase regression, and from peripheral blood specimens collected from non-melanomatous (tumor-free) Sinclair swine and control Hanford swine. Leukocyte identities were determined with single- and dual-parameter indirect immunofluorescence assays via flow cytometry.

Corticosteroid alteration of carboplatin-induced hematopoietic toxicity in a murine model.

Corticosteroids exhibit extensive hematopoietic effects both in vitro and in vivo. Some of the previously studied effects suggested that corticosteroids may alter hematopoietic toxicity of chemotherapeutic agents. In this study, we examined (1) the optimum dose and schedule of cortisone acetate (CA) to reduce hematopoietic toxicity of carboplatin (CB) and (2) possible mechanisms involved in this protective effect.

Instrument-dependent fluorochrome sensitivity in flow cytometric analyses.

Flow cytometry has become the preferred technique by which critical clinical evaluations are made such as CD4 counts and aneuploid analyses. Mounting concern has arisen over the numerous techniques, reagents, and different flow cytometric employed to determine these data. Several studies have documented significant differences in results when different flow cytometers are utilized to analyze the same sample.

Corticosteroid modulation of interleukin-1 hematopoietic effects and toxicity in a murine system.

Interleukin-1 (IL-1) has been shown to ameliorate the hematopoietic toxicities of antitumor chemotherapeutic agents in both mice and humans. However, IL-1 toxicity in humans is considerable and is similar to the systemic inflammatory toxicities induced by IL-3, IL-6, and other cytokines with pleiotropic biologic activities, eg, fever, nausea, malaise, and hypotension. We hypothesized that corticosteroids may reduce IL-1 toxicity without reducing IL-1 hematopoietic effects in vivo.

Effects of isolation on interferon production and hematological and immunological parameters.

A 27-year-old woman was maintained in an isolated state for 131 days in Carlsbad Caverns, New Mexico. Her diet was vitamin D-depleted. Determinations on the effects of such isolation on levels and activities of peripheral blood cells that are important for hematological homeostasis and immunological function were carried out.

The utilization of monoclonal antibodies in the diagnosis of unusual leukemias.

Development of monoclonal antibodies to lymphoid cells has allowed for simple methods for the classification of leukemias. Using the monoclonal antibodies, B1, B4, T1, T11, Ia, CALLA, My7, My9, and a polyclonal TdT reagent, we report a number of unusual phenotypes analyzed by flow cytometry. Two cases of mixed linkage leukemia are reported, one marked with anti-CALLA and My9, the other marked with T11 and Ia.

Enhancement of mixed lymphocyte culture reactions between donor and recipient in B cell chronic leukemia using antibody-coated beads.

Matching of donors and recipients in cases of B cell chronic lymphocytic leukemia (CLL) is complicated by the fact that the cancer clone dominates the blood. A case of CLL was characterized for its antigenic phenotype using monoclonal antibodies. Iron beads were coated with the appropriate antibody and used to remove the cancer clone.

Cell cycle perturbations following DNA damage in the presence of ADP-ribosylation inhibitors.

Cell cycle analysis by DNA flow cytofluorimetry and autoradiography has been utilized to investigate the effects of 3-methoxybenzamide (MBA), a potent inhibitor of ADP-ribosylation reactions, on cell cycle progression in N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-treated C3H10T1/2 cells. Following a dose of 6.8 microM MNNG, the presence of MBA resulted in an increased length of S phase from approximately 6.

The ethanol fractionation of mouse serum.

A method for the ethanol fractionation of normal mouse serum has been developed which is rapid and simple to perform. The method was shown to be effective in purification of IgG1, IgG2 and gammaM-gammaA globulins. Gel filtration and zone electrophoresis proved to be effective in separating the gammaM-gammaA globulin combination into their respective components.

Effect of gold on the immune response of mice.

Separate concurrent injection of organic gold compounds and antigen into mice resulted in immunoenhancement that could be measured by direct and indirect plaque-forming cells, rosette-forming cells, and serum antibody assays. Kinetics of the immune response showed variable effects through day 9 of the experiment. Studies with British anti-lewisite, a gold antagonist, showed that the gold must stay in the system 1 day to obtain immunoenhancement.

Antiglobulin factors in normal mouse serum reacting with enzyme-digested gamma globulin.

The presence of antiglobulin factors in normal mouse serum was studied. Mice were injected with human 0 Rh(+) erythrocytes and the resulting gamma globulins were digested with papain. The reaction was demonstrated by agglutinations of human 0 Rh (+) perythryocytes sensitized with the Fab fragments when treated with normal mouse serum.