Effect of Pyridoxal 5'-Phosphate (PALP) on Human Platelet Aggregation, Dense Granule Release and Thromboxane B2 Generation - Role of Schiff Base Formation

S Krishnamurthi; J Westwick; V V Kakkar

doi:10.1055/s-0038-1657242

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1982; 48(02): 136-141
DOI: 10.1055/s-0038-1657242

Original Article

Schattauer GmbH Stuttgart

Effect of Pyridoxal 5'-Phosphate (PALP) on Human Platelet Aggregation, Dense Granule Release and Thromboxane B₂ Generation - Role of Schiff Base Formation

Authors

S Krishnamurthi

The Thrombosis Research Unit, King's College Hospital Medical School, Denmark Hill, London, U.K.
J Westwick

The Thrombosis Research Unit, King's College Hospital Medical School, Denmark Hill, London, U.K.
V V Kakkar

The Thrombosis Research Unit, King's College Hospital Medical School, Denmark Hill, London, U.K.

Abstract

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Summary

Pyridoxal 5’-phosphate (PALP) inhibited ADP, thrombin, adrenaline, PAF and AA induced aggregation and ¹⁴C-5HT release. Thromboxane B² (TxB²) generation induced by all the above agents except AA was also inhibited indicating that PALP may be inhibiting AA release via phospholipase A² activation rather than AA metabolism. PALP inhibited ristocetin induced aggegation in PRP and agglutination in formaldehyde-treated washed platelets (FWP). Inhibition of ADP, adrenaline, PAF and AA-induced aggregation and ¹⁴C-5HT release by PALP was found in resuspended platelets pretreated with PALP and sodium borohydride suggesting that inhibition was mediated by Schiff base formation with platelet surface amino groups.

Irreversible fixation of PALP to the platelet membrane by borohydride reduction also inhibited thrombin induced ¹⁴C-5HT release and TxB² generation but not thrombin induced primary aggregation or ristocetin induced agglutination in FWP. This suggests that PALP may interact with specific glycoproteins on the platelet membrane involved in ADP, adrenaline and PAF induced primary aggregation and that PALP could be inhibiting ristocetin induced agglutination by direct interaction with ristocetin or FVIII RCoF.

Keywords

Human platelets - Pyridoxal 5'-phosphate - Thromboxane B₂

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References

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