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Catalase inhibition in diabetic rats potentiates DNA damage and apoptotic cell death setting the stage for cardiomyopathy.

Abstract：

:Diabetes is a risk factor for cardiovascular disease that has a multifactorial etiology, with oxidative stress as an important component. Our previous observation of a significant diabetes-related increase in rat cardiac catalase (CAT) activity suggested that CAT could play a major role in delaying the development of diabetic cardiomyopathy. Thus, in the present work, we examined the effects of the daily administration of the CAT inhibitor, 3-amino-1,2,4-triazole (1 mg/g), on the hearts of streptozotocin (STZ)-induced diabetic rats. Administration of CAT inhibitor was started from the 15th day after the last STZ treatment (40 mg/kg/5 days), and maintained until the end of the 4th or 6th weeks of diabetes. Compared to untreated diabetic rats, at the end of the observation period, CAT inhibition lowered the induced level of cardiac CAT activity to the basal level and decreased CAT protein expression, mediated through a decline in the nuclear factor erythroid-derived 2-like 2 /nuclear factor-kappa B p65 (Nrf2/NF-κB p65) subunit ratio. The perturbed antioxidant defenses resulting from CAT inhibition promoted increased H₂O₂production (P < 0.05) and lipid peroxidation (P < 0.05). Generated cytotoxic stimuli increased DNA damage (P < 0.05) and activated pro-apoptotic events, observed as a decrease (P < 0.05) in the ratio of the apoptosis regulator proteins Bcl-2/Bax, increased (P < 0.05) presence of the poly(ADP-ribose) polymerase-1 (PARP-1) 85 kDa apoptotic fragment and cytoplasmic levels of cytochrome C. These findings confirm an important function of CAT in the suppression of events leading to diabetes-promoted cardiac dysfunction and cardiomyopathy.

journal_name

J Physiol Biochem

journal_title

Journal of physiology and biochemistry

authors

Ivanović-Matić S,Bogojević D,Martinović V,Petrović A,Jovanović-Stojanov S,Poznanović G,Grigorov I

doi

10.1007/s13105-014-0363-y

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

947-59

issue

4

eissn

1138-7548

issn

1877-8755

journal_volume

70

pub_type

杂志文章

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