Ayşe A. KUNDAK, HAKAN ERBAŞ, Şendoğan GÜLEN, Gülbin DÖKMECİ, Hüseyin ÇELİK, Turgut ÖZCAN

C ve E vitaminlerinin, kronik olarak alkolle beslenen sıçanlarda beyin dokusu arjinaz aktivitesi, ornitin ve üre düzeylerine etkileri

Amaç: Sıçanlarda uzun süreli alkol kullanımının beyin arjinaz enzim aktivitesi ve ornitin üzerine etkisi ile C ve E vitaminlerinin bu parametreler üzerindeki etkisi araştırıldı. Çalışma Planı: Çalışmada 4-6 aylık, 75 erkek Wistar Albino cinsi sıçan kullanıldı. On beşerlik gruplar halinde beş çalışma grubu oluşturuldu. Birinci gruba alkole eşit kaloride glukoz oral yoldan verilirken, 2. gruba alkol, 3. gruba alkole ek olarak C vitamini, 4. gruba alkole ek olarak E vitamini, 5. gruba alkole ek olarak C ve E vitaminleri 20 hafta süreyle verildi. Yirminci hafta sonunda sıçanlar sakrifiye edildi. Beyin dokusu örneklerinde arjinaz enzim aktivitesi, ornitin ve üre düzeyleri ölçüldü. Bulgular: Beyin dokusu arjinaz aktivitesi, ornitin ve üre düzeyleri tedavi alan gruplarda alkol grubuna oranla anlamlı olarak yüksek bulundu. Sonuç: Kronik alkol kullanımında arttığı bilinen nitrik oksit sentazın (NOS), L-arjinin havuzunun tükenmesine yol açarak arjinaz enzim aktivitesinde azalmaya neden olabileceği, antioksidan vitaminler olarak C ve E vitaminlerinin kullanımının, oksidatif stresi azaltıp arjinaz/NOS yolağını arjinaz lehine çevirebileceği ve olumsuz etkileri bilinen nitrik oksit üretiminin azalmasının söz konusu olabileceği düşünülmektedir. Aynı anda üretimi artan poliaminler bu olumlu etkiyi daha da artırabilecektir. Dolayısı ile kronik alkol kullanımının zararlı etkilerini azaltmada C ve E vitaminlerinden yararlanılabilir.

Anahtar Kelimeler:

Vitamin E, Alkol kullanımı, Ornitin, Sıçan, Wistar, Üre, Askorbik asit, Arginaz, Modeller, hayvan

Effects of vitamin A and E on arginase activity, ornithine and urea levels in brain tissues of rats on long-term alcohol administration

Objectives: The effect of long-term alcohol administration on brain arginase enzyme activity, ornithine and urea levels and the changes induced by administration of vitamins C and E were investigated. Study Design: Seventy-five male Wistar Albino rats between 4-6 months of age were used. Five study groups, each consisting of 15 rats were formed. The first group received oral glucose with a calorie value equivalent to alcohol. The second group received alcohol, the third, fourth and fifth groups received vitamins C, E and C+E, respectively, in addition to alcohol, for 20 weeks. All animals were sacrificed by the end of 20 weeks and arginase activity, ornithine and urea levels were measured in brain tissue samples. Results: In the treatment groups, arginase activities, ornithine and urea levels were significantly higher than the alcohol group (group 2). Conclusion: These results suggest that the nitric oxide synthase (NOS) enzyme which isshown to have increased in chronic alcohol intake, may cause a decrease in arginase enzyme activity via depleting the L-arginine pool. Antioxidant replacement therapy may increase the arginase enzyme activity and therefore lead to a decrease in nitric oxide production which has been shown to have some negative effects. On the other hand, simultaneously increased polyamine production may potentiate the beneficial effects of these vitamins.Thus, vitamins C and E may prove to be effective in reducing the deleterious effects of chronic alcohol consumption.

Keywords:

Vitamin E, Alcohol Drinking, Ornithine, Rats, Wistar, Urea, Ascorbic Acid, Arginase, Models, Animal,

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