Occupancy of glycoprotein IIb/IIIa by B-6 vitamers inhibits human platelet aggregation

S. J. Chang, C. N. Chang, C. W. Chen

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14 Citations (Scopus)


Vitamin B-6 inhibits platelet aggregation. However, the effect of the occupancy of GPIIb/IIIa, a major receptor responsible for aggregation on platelet membranes, by B-6 vitamers on platelet aggregation is unknown. This study was carried out to quantify GPIIb/IIIa occupancy in platelets treated with B-6 vitamers [pyridoxal-5-phosphate (PLP); pyridoxal (PL); pyridoxine (PN); pyridoxamine (PM)], using a monoclonal antibody-based assay, by flow cytometry. Antibody binding was compared with inhibition of platelet aggregation. PLP, PL, PN and PM occupied GPIIb/IIIa with dissociation constants of 1.83 ± 1.15, 19.43 ± 7.86, 3.63 ± 1.67 and 10.89 ± 2.93 mmol/L, respectively. Occupancy of GPIIb/IIIa by the four B-6 vitamers was negatively correlated with platelet aggregation (r = -0.90 to -0.94, P < 0.001). The concentrations of the four B-6 vitamers that inhibited maximal platelet aggregation were in the order of PLP < PN <PM < PL, the same order in which they occupied ≥80% of the GPII/IIIa receptor. Platelet aggregation was inhibited by B-6 vitamers via the occupancy of GPIIb/IIIa with the potency of PLP > PN > PM > PL.

Original languageEnglish
Pages (from-to)3603-3606
Number of pages4
JournalJournal of Nutrition
Issue number12
Publication statusPublished - 2002 Dec 1

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Nutrition and Dietetics


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