Protein Z levels and central retinal vein or artery occlusion.

Abstract:

OBJECTIVES:Central retinal vein occlusion (CRVO) and central retinal artery occlusion (CRAO) are common disorders associated with risk factors for atherosclerosis. Protein Z is a cofactor for the inactivation of activated factor X (Xa) by the protein Z dependent protease inhibitor. Protein Z deficiency was recently linked to increased risk of arterial thrombosis. We investigated whether CRVO and CRAO are associated with low protein Z levels. PATIENTS AND METHODS:Patients with CRVO, CRAO or recurrent branch retinal vein occlusion were recruited to the study. Protein Z level, lupus anticoagulant (LAC), anticardiolipin antibodies (ACA) and activated protein C resistance (APCR) were determined in plasma from patients (n = 36) and healthy controls (n = 42). RESULTS:Thirty patients in the study group had traditional risk factors for retinal vessel occlusion and six patients had none. There was no significant difference in protein Z levels between the whole study group patients and controls (1995 +/- 810 vs. 2010 +/- 603 ng/mL, P = 0.922). However, patients with no risk factors for retinal vessel occlusion had significantly lower protein Z levels than controls (1379 +/- 682 vs. 2010 +/- 603 ng/mL, P = 0.022). Positive LAC was found in six patients and one control subject (P = 0.04). There were three patients and one control subject with abnormal APCR (P = 0.3) and none with positive ACA. Low protein Z level (lower than fifth percentile of control) was not associated with the presence of LAC or APCR. CONCLUSION:Low protein Z level may be another risk factor for retinal vessel occlusion in patients without traditional risk factors for these disorders.

journal_name

Eur J Haematol

authors

Koren-Michowitz M,Eting E,Rahimi-Levene N,Garach-Jehoshua O,Volcheck Y,Kornberg A

doi

10.1111/j.1600-0609.2005.00529.x

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

401-5

issue

5

eissn

0902-4441

issn

1600-0609

pii

EJH529

journal_volume

75

pub_type

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