[Human platelet antigen: brief review of the topic and its clinical significance].

Platelet antigens are essential cellular components in the coagulation cascade and the immune response. Platelets are small anucleate cellular-fragments, measuring 2 to 3 μm, resulting from the fragmentation of megakaryocyte cytoplasm. Their role in hemostasis involves clot formation to halt bleeding in case of vascular injuries. Platelet antigens are proteins found on the surface of these cell fragments, participating in interactions with other blood cells and the immune response. Genetic variability and individual differences in antigens have led to the discovery of various antigen systems, such as the HLA (human leukocyte antigen) system and the ABO system. These systems influence blood compatibility in transfusions and transplants, as well as the occurrence of adverse reactions. Research in this field has proposed mechanisms related to the pathogenesis of platelet disorders and autoimmune diseases. The study of antigens has evolved with advances in genetics, molecular biology, and immunology, leading to a better understanding of their clinical relevance and impact on human health. The identification of these antigens remains crucial for improving transfusion therapies, investigating bleeding disorders, and exploring potential therapeutic targets in various diseases.