Heterogeneity of human platelets: II. Functional evidence suggestive of young and old platelets

S Karpatkin - The Journal of clinical investigation, 1969 - Am Soc Clin Investig
S Karpatkin
The Journal of clinical investigation, 1969Am Soc Clin Investig
In the previous communication, suggestive evidence was presented for large-heavy
platelets being “young” platelets and light-small platelets being “old” platelets. Large-heavy,
light-small, and total human platelet populations were compared with respect to their platelet
function. After addition of adenosine diphosphate (ADP), thrombin, or epinephrine, platelet
aggregation time was 3.0-, 4.5-, and 3.3-fold shorter with large-heavy platelets compared
with light-small platelets, and large-heavy platelets released 3.7-, 7.6-, and 8.1-fold greater …
In the previous communication, suggestive evidence was presented for large-heavy platelets being “young” platelets and light-small platelets being “old” platelets. Large-heavy, light-small, and total human platelet populations were compared with respect to their platelet function. After addition of adenosine diphosphate (ADP), thrombin, or epinephrine, platelet aggregation time was 3.0-, 4.5-, and 3.3-fold shorter with large-heavy platelets compared with light-small platelets, and large-heavy platelets released 3.7-, 7.6-, and 8.1-fold greater adenosine triphosphate (ATP) into the medium, respectively, than did light-small platelets. After platelet aggregation by thrombin or epinephrine, large-heavy platelets released 6.0- and 3.8-fold more ADP into the medium than did light-small platelets. After platelet aggregation by ADP, light-small platelets consumed 5.9-fold greater added extracellular ADP than did large-heavy platelets.
Large-heavy platelets aggregated by ADP, thrombin, or epinephrine released 9.1-, 8.5-, and 12.7-fold greater platelet factor 4 than light-small platelets similarly treated.
The Journal of Clinical Investigation