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You are here: Contents > 2017 > Volume 26 Number 4 July 2017 > BASIC SCIENCE > The Role of Protein Z and Protein Z-Dependent Protease Inhibitor Polymorphisms in the Development of Prosthetic Heart Valve Thrombosis

The Role of Protein Z and Protein Z-Dependent Protease Inhibitor Polymorphisms in the Development of Prosthetic Heart Valve Thrombosis

Süleyman Karakoyun1,9, Mustafa Ozan Gürsoy2, Macit Kalçık3, Mahmut Yesin4, Sabahattin Gündüz5, Mehmet Ali Astarcıoğlu6, Zübeyde Bayram5, Beytullah Çakal7, Emrah Bayam5, Mehmet Özkan5,8

1Kafkas University Medical School, Department of Cardiology, Kars, Turkey
2Gaziemir State Hospital, Department of Cardiology, İzmir, Turkey
3Hitit University Faculty of Medicine, Department of Cardiology, Çorum, Turkey
4Kars Harakani State Hospital, Department of Cardiology, Kars, Turkey
5Kosuyolu Kartal Heart Training and Research Hospital, Department of Cardiology, İstanbul, Turkey
6Evliya Celebi Training and Research Hospital, Department of Cardiology, Kütahya, Turkey
7İstanbul Medipol University, Department of Cardiology, İstanbul, Turkey
8Ardahan University, Division of Health Sciences, Ardahan, Turkey
9Electronic correspondence: sleymankarakoyun@yahoo.com.tr

Background and aim of the study: Protein Z (PZ) is a vitamin K-dependent factor that is synthesized mainly by the liver. It acts as an activator of serpin, the protein Z-dependent inhibitor (ZPI), which inhibits factor Xa. The potential role of alterations in protein Z and/or ZPI levels in the pathogenesis of thrombotic and/or hemorrhagic diseases has been previously investigated, but results have been conflicting. The study aim was to evaluate the role of PZ/ZPI polymorphisms in the development of prosthetic valve thrombosis (PVT).

Methods: This prospective, observational cross-sectional study included 50 consecutive patients with PVT [non-obstructive thrombosis (NOT) in 35 patients; obstructive thrombosis (OT) in 15] and 50 consecutive healthy subjects with normally functioning prostheses. gDNA was extracted from ca. 5 × 106 leukocytes, using the QIAamp DNA Mini Kit (Qiagen), according to the manufacturer’s recommendations. For mutational analysis, a minisequencing method was employed. Results of the analyses were compared between the PVT and control

groups, and also between the OT and NOT subgroups.

Results: The frequency of A allele (mutant type) of PZG79A was equal in all PVT patients and in controls. With regards to PZ-A13G polymorphisms, frequency of the mutant G allele was 22% in PVT patients and 19% in controls. Serpina-R67X polymorphism was observed in 8% of PVT patients and 6% of controls. Normal variant CC was present in 47 controls (94%), whereas a heterozygotic mutation (CT) was detected in four PVT patients (8%). Frequency of the ZPI-R67X mutation was significantly higher in patients with OT than in those with NOT (p = 0.041).

Conclusion: The present study was the first to evaluate the potential impact of PZ (PZ-A13G, PZG79A) and ZPI (R-67X, W303X) polymorphisms in the development of PVT. Based on the results of this small observational case-control study, PZ/ZPI polymorphisms do not appear to play an active role in the development of PVT. Hence, further extensive studies are necessary.

The Journal of Heart Valve Disease 2017;26:460-466


The Role of Protein Z and Protein Z-Dependent Protease Inhibitor Polymorphisms in the Development of Prosthetic Heart Valve Thrombosis

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