The Effects of Melatonin on Nrf2 Expression and Oxidative Stress in Heart Muscle and Skeletal Muscle in Rats with Experimental Diabetes

Öz

Aim: Diabetes mellitus (DM) is a metabolic disease characterized by chronic hyperglycemia. The goal of this study was to assess the effects of melatonin on skeletal muscle and heart muscle in rats with DM.

Material and Methods: 36 male Wistar albino rats were divided into 4 groups as control group, control+melatonin group, Diabetes group, Diabetes+melatonin group. Melatonin (10 mg/kg, ip) treatment was administered for four weeks. Malondialdehyde (MDA) level, reduced glutathione levels (GSH), Nrf2 and thioredoxin (TRX) levels were assessed.

Results: Skeletal and heart muscle MDA levels of the diabetic group were increased than the control groups and melatonin treatment was remarkably decreased this value. (p<0.05). Skeletal muscle GSH levels in the melatonin treated diabetic group was significantly higher than the diabetic group. In the diabetic group, skeletal muscle Nrf2 levels were found lower than control groups. This value increased to control levels with Melatonin treatment. Nrf2 levels of heart muscle in the diabetes group was found to be decreased, but grupit was not statistically significant. There was no differences between the groups in skeletal muscle in TRX levels. In the diabetes group, heart muscle TRX levels were lower than control groups and melatonin treatment increased this level (p<0.05).

Conclusion: Our results showed that melatonin treatment can reduce the oxidative stress induced with hyperglycemia by Nrf2 pathway in skeletal muscle and by TRX pathway in cardiac muscle.

Anahtar Kelimeler

• Diabetes mellitus
• Melatonin
• Nrf2
• Oxidative stress

Deneysel Diyabet Oluşturulan Sıçanlarda Kalp ve İskelet Kası Nrf2 Yapımı ve Oksidatif Stres Üzerine Melatoninin Etkisinin İncelenmesi

Öz

Amaç: Diabetes mellitus (DM) kronik hiperglisemi ile karakterize metabolik bir hastalıktır. Bu çalışmanın amacı, melatoninin DM’li
sıçanlarda iskelet kası ve kalp kası üzerindeki etkilerini değerlendirmektir.

Gereç ve Yöntemler: 36 erkek Wistar albino rat kontrol grubu, kontrol + melatonin grubu, Diyabet grubu, Diyabet + melatonin grubu
olarak 4 gruba ayrıldı. Melatonin (10 mg / kg, ip) tedavisi dört hafta süreyle uygulandı. Malondialdehit (MDA) seviyeleri ve indirgenmiş
glutatyon seviyeleri (GSH) ile Nrf2 ve tiyoredoksin (TRX) seviyeleri değerlendirildi.

Bulgular: Diyabetik grubun iskelet ve kalp kası MDA düzeyleri kontrol gruplarına göre yüksek bulunurken, melatonin tedavisi ile bu
değer anlamlı düzeyde azalmıştır (p<0,05). İskelet kası GSH seviyesi melatonin tedavili diyabet grubunda, diyabet grubuna göre yüksek
bulunmuştur. Diyabet grubunda iskelet kası Nrf2 düzeyleri kontrol gruplarına göre azalmıştır. Bu azalış melatonin uygulaması ile
kontrol değerlerine yükselmiştir. Kalp kası Nrf2 düzeyleri diyabet grubunda düşük görülmesine rağmen bu farklılık anlamlı değildir.
İskelet kası TRX seviyelerinde gruplar arasında farklılık saptanmamıştır. Kalp kası TRX seviyeleri diyabetik grupta düşük bulunurken
melatonin tedavisi ile yükselmiştir (p<0,05).

Sonuç: Çalışmamızın sonuçları melatonin tedavisinin hipergliseminin oluşturduğu oksidatif stresi iskelet kasında Nrf2 yolağı ile kalp
kasında ise TRX yolağı ile azaltabileceğini göstermektedir.

Anahtar Kelimeler

• diabetes mellitüs
• melatonin
• Nrf2
• oksidatif stres

Kaynakça

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