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001-es BibID:	BIBFORM043389
Első szerző:	Kovács Emese Gyöngyvér (kardiológus)
Cím:	New direct and indirect methods for the detection of cyclooxygenase 1 acetylation by aspirin; the lack of aspirin resistance among healthy individuals / Emese G. Kovács, Éva Katona, Zsuzsanna Bereczky, Nóra Homoródi, László Balogh, Eszter Tóth, Hajna Péterfy, Róbert G. Kiss, István Édes, László Muszbek
Dátum:	2013
ISSN:	0049-3848
Megjegyzések:	Background: Aspirin is widely used in the prevention of acute atherothrombotic complications. It acetylates Ser529 residue in cyclooxygenase-1 (COX-1) and prevents thromboxane A2 (TXA2) formation from arachidonic acid (AA) in platelets. Laboratory methods used for the detection of aspirin effect provide inconsistent results. Methods: Two new methods were developed for the direct and indirect detection of COX-1 acetylation by aspirin in 108 healthy volunteers treated daily with 100 mg enteric-coated aspirin for 7 days. Monoclonal antibodies were raised against acetylated and non-acetylated nonapeptides corresponding to the amino acid sequence of human COX-1 525-533 residues. Using Western blotting technique the antibodies clearly distinguished between acetylated and non-acetylated COX-1 in platelet lysate. The second method measures AA-induced TXB2 production of platelets in diluted platelet rich plasma. Results: No acetylated COX-1 was detected in platelets before aspirin treatment. At the same time antibodies raised against non-acetylated peptide gave intense reaction with COX-1 on the Western blot. In contrast, after 7 days of aspirin treatment, with a single exception, only acetylated COX-1 could be detected in the platelet lysate. The non-responding volunteer showed full response to aspirin after controlled drug intake. In parallel experiments aspirin treatment for 7 days practically completely inhibited AA-induced TXB2 production by platelets. Conclusions: Chemical ("true") aspirin resistance, if it exists, must be a rarity among healthy individuals. The new methods could be used for detecting the acetylation of COX-1 by aspirin in patients on preventive aspirin therapy and for evaluating methods routinely used for such purpose.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban aspirin aspirin resistance Doktori Iskola
Megjelenés:	Thrombosis Research. - 131 : 4 (2013), p. 320-324. -
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/B-10/1-2010-0024 TÁMOP K 78386 OTKA MTA11003 MTA NKFP-07-A1-2008-0127 Egyéb TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Laki Kálmán Doktori Iskola
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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