title: Age related changes of platelet prostacyclin receptors in humans.
abstract: Platelet receptors for PGI2 were investigated in eighteen healthy volunteers divided in two classes of age: nine were 18-40 years old and nine were 41-65 years old. PGI2 platelet receptors were found to decrease significantly with age; the young subjects had 106 +/- 16 (mean +/- SD) high affinity receptors/platelet and 3509 +/- 529 low affinity receptors/platelet whereas the old subjects had 86 +/- 14 high affinity receptors/platelet (P less than 0.02) and 2471 +/- 640 low affinity receptors/platelet (P less than 0.005). The cumulated data from all the subjects yielded a significant negative correlation with age (r = -0.71, P less than 0.001 for the high affinity class and r = -0.65, P less than 0.01 for the low affinity class). The affinity of receptor sites for the ligand did not statistically change with aging (P less than 0.30 and P less than 0.90 respectively for high and low affinity receptors).
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001792:Blood Platelets / Q000378:metabolism*; D011464:Epoprostenol / Q000097:blood; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D011956:Receptors, Cell Surface / Q000378:metabolism*; D044006:Receptors, Epoprostenol; D011982:Receptors, Prostaglandin / Q000378:metabolism*
chemical_list: D011956:Receptors, Cell Surface; D044006:Receptors, Epoprostenol; D011982:Receptors, Prostaglandin; D011464:Epoprostenol