[Suppression by bone marrow cells of the level of specific IgE antibodies in the blood of mice and decrease in the production of IGE by bone marrow cells]. / Podavlenie kletkami kostnogo mozga urovnia spetsificheskikh IgE-antitel v syvorotke krovi myshei i snizhenie vyrabotki IgE kostnomozgovymi kletkami.

Changes in the level of the specific IgE-antibodies to ovalbumin under the influence of syngeneic cells of a bone marrow were studied. The IgE-response was induced by ovalbumin in mice (CBA X C57Bl/6)F1. The bone marrow cells suspensions (20-30 X 10(6) cells per mouse) from syngeneic donors was inoculated simultaneously with the immunization. It was found that bone marrow cells suppressed both the level of IgE-antibodies in experimental mice serum and the production of IgE by the bone marrow cells of the recipient. The ability to suppress IgE-response remained when erythrocytes, monocytes and T-lymphocytes were removed from inoculated suspensions. The bone marrow cells taken from the mice immunized with ovalbumin, at the stage of a decreasing IgE-response, provided more pronounced suppression, than bone marrow cells taken from intact animals.

[Histamine release from human leukocytes after treatment with 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine (platelet activating factor) and its structural analogs]. / Vysvobozhdenie gistamina iz leikotsitov cheloveka pod deistviem 1-O-alkil-2-O-atsetil-sn-glitsero-3-fosfokholina (faktor aktivatsii trombotsitov) i ego strukturnykh analogov.

The influence of 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine, a platelet activating factor (PAF), and its structural analogs--1-acyl-2-acetyl-sn-glycero-3-phosphocholine and 1-(1'-alkenyl)-glycero-3-phosphocholine--on the histamine release from human leukocytes of healthy and allergic individuals was investigated. It was found that within the concentration range of 10(-10) to 10(-7) M PAF and its analogs induce a moderate histamine release from the leukocytes. However, at higher concentrations (greater than 10(-7) M) PAF induces an enhanced release of histamine from the leukocytes of allergic patients as compared to healthy individuals. PAF and its analogs significantly potentiate the allergens-induced release of histamine from the leukocytes of allergic patients. It was assumed that PAF induces the expression or demasking of additional numbers of IgE receptors on the surface of basophils, which leads tot he stimulation of histamine release from the leukocytes in the presence of allergens.