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Biomedical subjects

E Hem

Publications and source records attributed to E Hem.

11 recordsLinked to original sources
PubMed1988

Synchronous bilateral primary germ cell tumors in patient receiving estrogen therapy.

The present report concerns the occurrence of bilateral synchronous germ cell tumors in a sixty-eight-year-old man who received estrogen therapy for eleven months. Although there are previous reports on Leydig cell tumors developing in mice and man receiving estrogens, we have not found any connection between germ cell tumors and estrogen medication reported in the literature.

Aged↗
PubMed1979

Modulation by macrophages of lymphocyte responses to phytohaemagglutinin, concanavalin A and semiallogeneic cells.

To investigate the effect of macrophages on rat lymphocyte activation by phytohaemagglutinin (PHA), concanavalin A (Con A) and semiallogeneic cells (uniderectional MLR), increasing concentrations of peritoneal cells (PC) were added to cultures of lymph node lymphocytes. Lymph node cell preparations contained 2-4% esterase positive cells (macrophages/monocytes). Any additional PC seemed only to inhibit MLR, whereas optimal responses of PHA and Con A stimulated cultures occurred when 1-2% abd 3-7% PC respectively were added. Ten percent PC markedly inhibited the response of both PHA and Con A stimulated cultures when added for the last 24 h of incubation. Inhibitory cells were shown to belong to the glass-wool adherent population of PC.

Animals↗
PubMed1978

Freezing of rat lymphocytes. V. The effect of suppressor cells in phytohaemagglutinin-stimulated spleen cell cultures before and after freeze-thawing.

Spleen lymphocyte proliferation, as measured by 3H-thymidine incorporation induced by phytohaemagglutinin (PHA), was increased after freeze-thawing with 10% dimethyl sulphoxide. Depletion or intoxication of macrophages in fresh spleen cell preparations also increased lymphocyte proliferation in response to PHA. On the other hand, freezing of macrophage-depleted spleen cell suspensions lowered 3H-thymidine uptake of stimulated cultures. At concntrations above 3%, macrophages added to cultures of fresh purified lymphocytes showed a dose-dependent inhibitory effect on the PHA response, and fresh macrophages were more inhibitory than frozen-thawed macrophages. Purified lymphocytes mixed with 10% macrophages showed a higher response after freeze-thawing. It is concluded that macrophages suppress the lymphoproliferative response to PHA in rat spleen cell cultures, and that these macrophages are more sensitive than lymphocytes to the present freeze-thaw process.

Animals↗
PubMed1977

Freezing of rat lymphocytes. IV. In vitro and in vivo responses of T-cells.

Rat lymph node lymphocytes have been frozen-thawed with 10% dimethyl sulphoxide as cryoprotectant. The present study shows that these cells respond well in T-cell functional assays, such as stimulation with phytohaemagglutinin, as responder cells in the mixed lymphocyte reaction and in the local graft-versus-host assay. The magnitude of the responses obtained with frozen-thawed cells was some 70-80% of corresponding fresh cells.

Animals↗
PubMed1976

Freezing of rat lymphocytes. III. Freezing of plaque-forming cells and restoration by frozen-thawed normal cells of antibody production in irradiated rats.

The present investigation is an extension of earlier work with dimethyl sulphoxide (DMSO) protected frozen-thawed rat lymphocytes. In the present work it is shown that some 85-90% of the haemolytic plaque-forming cells (PFC) survived the freeze-thaw process. Irradiated rats were restored with fresh and frozen-thawed cells and immunized against sheep red blood cells (SRBC). Evidence is presented that a restrictive control of the PFC response by suppressor cells present in the spleen cell suspension is lost during the freeze-thaw process, giving a higher number of PFC/spleen in recipients of frozen-thawed mixed spleen and lymph node cells than in rats receiving the corresponding fresh preparations.

Animals↗