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Ozone Therapy on Rats Submitted to Subtotal Nephrectomy: Role of Antioxidant System

Ozone Therapy on Rats Submitted to Subtotal Nephrectomy: Role of Antioxidant System

José Luis Calunga,1 Zullyt B. Zamora,1 Aluet Borrego,1 Sarahí del Río,2 Ernesto
Barber,3 Silvia Men´endez,1 Frank Hernández,1 Teresita Montero,2 and Dunia Taboada3

1Department of Biomedicine, Ozone Research Center, National Center for Scientific Research, PO Box 6414, Havana, Cuba
2Luis D´ıaz Soto Military Medicine Institute, Havana, Cuba
3Victoria de Gir´on Institute of Basic and Preclinical Sciences, 11600 Havana, Cuba

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Chronic renal failure (CRF) represents a world health problem. Ozone increases the endogenous antioxidant defense system, pre-serving the cell redox state. The aim of this study is to evaluate the effect of ozone/oxygenmixture in the renal function,morphology, and biochemical parameters, in an experimental model of CRF (subtotal nephrectomy). Ozone/oxygen mixture was applied daily, by rectal insufflation (0.5mg/kg) for 15 sessions after the nephrectomy. Renal function was evaluated, as well as different biochem- ical parameters, at the beginning and at the end of the study (10 weeks). Renal plasmatic flow (RPF), glomerular filtration rate (GFR), the urine excretion index, and the sodium and potassium excretions (as a measurement of tubular function) in the ozone group were similar to those in Sham group. Nevertheless, nephrectomized rats without ozone (positive control group) showed the lowest RPF, GFR, and urine excretion figures, as well as tubular function. Animals treated with ozone showed systolic arterial pressure (SAP) figures lower than those in the positive control group, but higher values compared to Sham group. Serum creati- nine values and protein excretion in 24 hours in the ozone group were decreased compared with nephrectomized rats, but were still higher than normal values. Histological study demonstrated that animals treated with ozone showed less number of lesions in comparison with nephrectomized rats. Thiobarbituric acid reactive substances were significantly increased in nephrectomized and ozone-treated nephrectomized rats in comparison with Sham group. In the positive control group, superoxide dismutase (SOD) and catalase (CAT) showed the lowest figures in comparison with the other groups. However, ozone/oxygen mixture induced a significant stimulation in the enzymatic activity of CAT, SOD, and glutathione peroxidase, as well as reduced glutathione in relation with Sham and positive control groups. In this animal model of CRF, ozone rectal administrations produced a delay in the advance of the disease, protecting the kidneys against vascular, hemorheological, and oxidative mechanisms. This behavior suggests ozone therapy has a protective effect on renal tissue by downregulation of the oxidative stress shown in CRF.


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