title: Inhibition of platelet aggregation by monoclonal antibody reactive with beta 2-microglobulin chain of HLA complex.
abstract: A mouse monoclonal antibody that reacts with beta 2-microglobulin, the light chain of class I major histocompatibility antigens, inhibited the second wave of human platelet aggregation induced by adenosine diphosphate and epinephrine and blocked aggregation and platelet protein phosphorylation induced by sodium arachidonate. Thrombin-induced platelet aggregation was inhibited at threshold concentrations but not at higher concentrations. The antibody also inhibited aggregation and secretion in response to thromboxane A2 or the stable endoperoxide analog, U46619. These results suggest that beta 2-microglobulin in the histocompatibility complex is intimately associated with transmission of the endoperoxide-thromboxane signal at the platelet membrane.
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000255:Adenosine Triphosphate / Q000097:blood; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000494:pharmacology; D001792:Blood Platelets / Q000378:metabolism; D001798:Blood Proteins / Q000378:metabolism; D000242:Cyclic AMP / Q000097:blood; D006680:HLA Antigens / Q000032:analysis*; D006801:Humans; D010766:Phosphorylation; D010974:Platelet Aggregation / Q000187:drug effects; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D011982:Receptors, Prostaglandin / Q000378:metabolism; D017482:Receptors, Thromboxane; D013928:Thromboxane A2 / Q000494:pharmacology; D001613:beta 2-Microglobulin / Q000276:immunology* / Q000502:physiology
chemical_list: D000911:Antibodies, Monoclonal; D001095:Arachidonic Acids; D001798:Blood Proteins; D006680:HLA Antigens; D011450:Prostaglandin Endoperoxides, Synthetic; D011982:Receptors, Prostaglandin; D017482:Receptors, Thromboxane; D001613:beta 2-Microglobulin; D016718:Arachidonic Acid; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000255:Adenosine Triphosphate; D000242:Cyclic AMP