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Thromb Haemost 2014; 112(01): 118-127
DOI: 10.1160/TH13-10-0844
Platelets and Blood Cells
Schattauer GmbH

In vivo prostacyclin biosynthesis and effects of different aspirin regimens in patients with essential thrombocythaemia

Viviana Cavalca   *
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
2   Università degli Studi di Milano, Dipartimento di Scienze Cliniche e di Co-munità, Milan, Italy
,
Bianca Rocca   *
3   Istituto di Farmacologia, Università Cattolica, Rome, Italy
,
Isabella Squellerio
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
,
Alfredo Dragani
4   Centro Malattie Emorragiche e Trombotiche, Ospedale ‘Spirito Santo’, Pescara, Italy
,
Fabrizio Veglia
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
,
Francesca Pagliaccia
3   Istituto di Farmacologia, Università Cattolica, Rome, Italy
,
Benedetta Porro
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
,
Silvia Stella Barbieri
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
,
Elena Tremoli
1   Centro Cardiologico Monzino, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy
5   Università degli Studi di Milano, Dipartimento di Scienze Farmacologiche e Biomolecolari, Milan, Italy
,
Carlo Patrono
3   Istituto di Farmacologia, Università Cattolica, Rome, Italy
› Author Affiliations
Further Information

Publication History

Received: 14 October 2014

Accepted after major revision: 24 January 2014

Publication Date:
01 December 2017 (online)

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Summary

Essential thrombocythaemia (ET) is characterised by enhanced platelet generation and thrombosis. Once daily (od) aspirin incompletely inhibits platelet thromboxane (TX)A2 production in ET. A twice daily (bid) dosing is necessary to fully inhibit TXA2. Whether this dosing regimen affects in vivo prostacyclin (PGI2) biosynthesis is unknown. PGI2 biosynthesis was characterised in 50 ET patients on enteric-coated (EC) aspirin 100 mg od, by measuring its urinary metabolite, 2,3-dinor-6-keto-PGF1α (PGI-M). Moreover, in a crossover study 22 patients poorly responsive to standard aspirin based on serum TXB2 levels (>4 ng/ml) were randomised to different seven-day aspirin regimens: EC aspirin 100 mg od, 100 mg bid, 200 mg od, or plain as-pirin 100 mg od. PGI-M measured 24 hours after the last aspirin intake (EC, 100 mg od) was similar in patients and healthy subjects both on (n=10) and off (n=30) aspirin. PGI-M was unrelated to in vivo TXA2 biosynthesis, and not affected by EC aspirin 100 mg bid or 200 mg od as compared to EC 100 mg od. PGI2 biosynthesis in aspirin-treated ET patients appears unrelated to TXA2 biosynthesis, and not affected by an improved aspirin regimen, demonstrating its vascular safety for future trials.

Keywords

Aspirin - prostacyclin - essential thrombocythaemia - platelets - thromboxane

* Contributed equally as first authors.


 

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