The Evaluation of Serum Paraoxanase Activity and Malondialdehyde Levels in Type 2 Diabetic Patients with Retinopathy
1Associate Professor of Ophthalmology Erciyes University, Kayseri-Turkey
2Erciyes Üniversitesi Tıp Fakültesi Biyokimya, Kayseri
3Department of Ophthalmology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
4Department of Internal Medicine Erciyes Üniversitesi, Kayseri Turkey
J Clin Pract Res 2010; 32(4): 235-240
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Abstract

Purpose: In the present study, we aimed to evaluate paraoxonase1 (PON1) activities and malondialdehyde (MDA) levels, one of the end products of lipid peroxidation induced by reactive oxygen species in diabetic patients with retinopathy.
Materials and Methods: Serum MDA levels and PON1 levels were measured spectrophotometrically in 57 diabetic patients with retinopathy and in 24 healthy subjects which constituted the control group.
Results: In the DM group, mean serum basal PON1, stimulated PON 1 and MDA levels are detected as 151.72 ± 76.26 U/L, 329.86 ± 234.05 U/L and 3.79 ± 2.11 nmol/mL, respectively. In the control group, mean serum basal PON1, stimulated PON 1 and MDA levels are detected as 272.69 ± 104.44 U/L, 554.29 ± 214.58 U/L and 1.12 ± 0.29 nmol/mL, respectively. When compared to healthy controls, there was a statistically significant decrease in serum basal PON1, stimulated PON 1 levels (p <0.001) and a significant increase in serum MDA levels (p <0.001) in diabetic patients.
Conclusion: Increased oxidative stress caused by hyperglycemia results in a decrease in PON activities, therefore, PON might be used as a marker in the management of glycemic control and the development of complications.


Retinopatisi Olan Tip 2 Diabetes Mellituslu Olgularda Serum Paraksonaz Aktivitesinin ve Malondialdehit Seviyelerinin Belirlenmesi
1Associate Professor of Ophthalmology Erciyes University, Kayseri-Turkey
2Erciyes Üniversitesi Tıp Fakültesi Biyokimya, Kayseri
3Department of Ophthalmology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
4Department of Internal Medicine Erciyes Üniversitesi, Kayseri Turkey
Journal of Clinical Practice and Research 2010; 4(32): 235-240

Amaç: Bu çalışmada Tip 2 diabetes mellituslu (DM) olgularda lipit peroksidasyonunun son ürünlerinden olan ve reaktif oksijen parçaları tarafından indüklenen, paraksonaz 1 (PON1) ve malondialdehit (MDA) seviyelerinin belirlenmesi amaçlanmıştır.
Materyal ve Metod: Elli yedi diabetik olguda ve kontrol grubunu oluşturan 24 sağlıklı olguda serum MDA ve PON1 seviyeleri spektrofotometrik olarak ölçüldü.
Bulgular: DM grubunda, ortalama serum bazal PON1 düzeyi 151,72 ± 76,26 U/L, ortalama stimüle PON 1 düzeyi 329,86 ± 234,05 U/L ve ortalama MDA düzeyi 3.79 ± 2.11 nmol/mL olarak bulundu. Kontrol grubunda ise ortalama serum bazal PON1 düzeyi 272,69 ± 104,44 U/L, ortalama stimüle PON 1 düzeyi 554,29 ± 214,58 U/L ve ortalama MDA düzeyi 1,12 ± 0.29 nmol/mL olarak bulundu. Diabetik olgularda serum bazal PON1 ve stimüle PON 1 düzeyleri sağlıklı kontrollere göre anlamlı olarak düşük saptanırken (p <0.001), serum MDA düzeyleri anlamlı olarak yüksekti (p <0.001).
Sonuç: Hiperglisemi nedeniyle artmış oksidatif stres PON aktivitesinde azalmaya neden olmaktadır. Bu nedenle PON glisemik kontrolün ve komplikasyon gelişiminin bir göstergesi olarak kullanılabilir.