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001-es BibID:	BIBFORM048954
Első szerző:	Kovács Emese Gyöngyvér (kardiológus)
Cím:	Evaluation of laboratory methods routinely used to detect the effect of aspirin against new reference methods / Emese G. Kovács, Éva Katona, Zsuzsanna Bereczky, Nóra Homoródi, László Balogh, Eszter Tóth, Hajna Péterfy, Róbert G. Kiss, István Édes, László Muszbek
Dátum:	2014
ISSN:	0049-3848
Megjegyzések:	Background: Aspirin, a commonly used antiplatelet agent, blocks platelet thromboxane A2 (TXA2) formationfromarachidonic acid (AA) by acetylating platelet cyclooxygenase-1 (COX-1). Laboratory methods currently used todetect this antiplatelet effect of aspirin provide variable results. We have reported three methods that assessplatelet COX-1 acetylation (inactivation) by aspirin and its direct consequences. The first and second assaysuse monoclonal anti-human-COX-1 antibodies that only detect acetylated (inactivated) COX-1 and active(non-acetylated) COX-1, respectively. The third method measures platelet production of TXB2 (the stablemetabolite of TXA2) in vitro in response to AA. We compared the results of these three reference methodswith other routinely used methods for assessing the functional consequences aspirin treatment.Methods: 108 healthy volunteers were treated with low-dose aspirin for 7 days. On day 7 following aspirintreatment COX-1 in the platelets was fully acetylated whereas only non-acetylated COX-1 was present in theday 0 platelets. Further, TXB2 production by day 7 platelets was completely blocked. The following tests wereperformed on the samples obtained from study participants before and after seven days of aspirin treatment:PFA-100 closure time with collagen/epinephrine cartridge, VerifyNow? (VN) Aspirin Assay, platelet aggregationand ATP secretion using AA, ADP, epinephrine and collagen as agonists.Results: Comparing the pre-treatment and day 7 values, methods that use AA as platelet agonist (AA-inducedplatelet aggregation/secretion and VN Aspirin Assay) showed high discriminative power. In contrast, results ofthe other tests showed considerable overlap between day 7 and day 0 values.Conclusions: Only assays that clearly distinguish between acetylated and non-acetylated platelet COX-1 are usefulfor establishing the antiplatelet effect of aspirin. The other tests are not suitable for this purpose.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban aspirin aspirin resistance platelet aggregation platelet secretion reference method thromboxane
Megjelenés:	Thrombosis Research. - 133 : 5 (2014), p. 811-816. -
További szerzők:	Katona Éva (1961-) (klinikai biokémikus) Bereczky Zsuzsanna (1974-) (orvosi laboratóriumi diagnosztika szakorvos) Homoródi Nóra (1974-) (kardiológus) Balogh László (1976-) (kardiológus) Tóth Eszter (1975-) (vegyész) Péterfy Hajna Kiss Róbert Gábor Édes István (1952-) (kardiológus) Muszbek László (1942-) (haematológus, kutató orvos)
Pályázati támogatás:	TÁMOP-4.2.2.A-11/1/KONV-2012-0045 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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