Nephroprotective Effect of Milkfish, Patin, and Snakehead Fish Oil by Suppressing Inflammation and Oxidative Stress in Diabetic Rats

Abstract

Diabetic nephropathy (DN) has been linked to a number of long-term problems caused by diabetes mellitus. Inflammatory and oxidative stress pathways contribute to DN development and progression. Many studies have shown the preventive advantages of diets rich in substances like anti-inflammatory and antioxidant elements like omega-3 fatty acids (n-3 FA) in preventing DN. Milkfish (Chanos chanos F.), patin (Pangasius micronema Blkr.), and snakehead fish (Chana striata Bloch) are fish oils which are known to contain n-3 FA. This study aims to evaluate the nephroprotective effect of three types of fish oils in a rat model of diabetes mellitus. Thirty male rats were used in this study. The animals were randomly divided into six groups (n = 5): the non-diabetic group, the diabetes mellitus group, the diabetic with 150 mg/kg metformin orally group, the diabetic with 1000 mg/kg milkfish oil orally group, the diabetic with 1000 mg/kg patin fish oil orally group, and the diabetic with 1000 mg/kg snakehead fish oil orally group. Diabetes models were induced using 65 mg/kg streptozotocin and 230 mg/kg nicotinamide intraperitoneally. The test was carried out for 8 weeks, followed by the observation of the biochemical profiles of blood, urine, oxidative stress, and the immunohistochemistry of the kidneys. A normally and homogeneously distributed test followed by a one-way analysis of variance (ANOVA) and the LSD post hoc test were used to analyse data at P 0.05. The results showed that serum creatinine levels did not differ significantly after the administration of milkfish, catfish, and snakehead fish oil for 8 weeks (p≥0.05). Different results were shown where the levels of serum BUN, uric acid, urine urea, and microalbumin urine were significantly different after administration of the three types of fish oil (p≤0.05). The same results were shown in oxidative stress (superoxide dismutase, glutathione, and malondialdehyde) and inflammation (interleukin-6 and tumor necrosis factor-α) profiles (p≤0.05).