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Effects of kolaviron on hepatic oxidative stress in streptozotocin induced diabetes.
BMC Complement Altern Med. 2015 Jul 16; 15:236.BC

Abstract

BACKGROUND

Alteration in antioxidant defence and increase in oxidative stress that results in tissue injury is characteristic of diabetes. We evaluated the protective effects of kolaviron (a flavonoid complex extracted from the seeds of Garcinia kola) on hepatic antioxidants, lipid peroxidation and apoptosis in diabetic rats.

METHODS

To induce diabetes, rats were injected with streptozotocin intraperitoneally at a single dose of 50 mg/kg. Kolaviron (100 mg/kg) was administered orally for 6 weeks (5 times weekly). Activities of liver antioxidant enzymes was analysed with Multiskan Spectrum plate reader. High performance liquid chromatography (HPLC) was used in the analysis of MDA (malondialdehyde), a product of lipid peroxidation. Apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay.

RESULT

Diabetic rats exhibited a significant increase in the peroxidation of hepatic lipids as observed from the elevated level of malondialdehyde (MDA). In addition, Oxygen Radical Absorbance Capacity (ORAC), level of reduced glutathione (GSH), ratio of reduced to oxidized glutathione (GSH: GSSG) and catalase (CAT) activity were decreased in the liver of diabetic rats. The activities of GPX (glutathione peroxidase) and SOD (superoxide dismutase) were unaltered in diabetic rats. TUNEL assay revealed increased apoptotic cell death in the liver. Kolaviron attenuated lipid peroxidation and apoptosis, increased CAT activity, GSH levels and GSH: GSSG ratio. The ORAC of kolaviron-treated diabetic liver was restored to near-normal values.

CONCLUSION

Kolaviron protects the liver against oxidative and apoptotic damage induced by hyperglycemia.

Authors+Show Affiliations

Department of Biochemistry, Bowen University, Iwo, Nigeria.Department of Wellness Sciences, Cape Peninsula University of Technology, Cape Town, South Africa.Nutrition and Chronic Diseases Unit, Oxidative Stress Research Centre, Department of Biomedical Sciences, Cape Peninsula University of Technology, Bellville, South Africa. oguntibejuo@cput.ac.za.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26179065

Citation

Oyenihi, Omolola R., et al. "Effects of Kolaviron On Hepatic Oxidative Stress in Streptozotocin Induced Diabetes." BMC Complementary and Alternative Medicine, vol. 15, 2015, p. 236.
Oyenihi OR, Brooks NL, Oguntibeju OO. Effects of kolaviron on hepatic oxidative stress in streptozotocin induced diabetes. BMC Complement Altern Med. 2015;15:236.
Oyenihi, O. R., Brooks, N. L., & Oguntibeju, O. O. (2015). Effects of kolaviron on hepatic oxidative stress in streptozotocin induced diabetes. BMC Complementary and Alternative Medicine, 15, 236. https://doi.org/10.1186/s12906-015-0760-y
Oyenihi OR, Brooks NL, Oguntibeju OO. Effects of Kolaviron On Hepatic Oxidative Stress in Streptozotocin Induced Diabetes. BMC Complement Altern Med. 2015 Jul 16;15:236. PubMed PMID: 26179065.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of kolaviron on hepatic oxidative stress in streptozotocin induced diabetes. AU - Oyenihi,Omolola R, AU - Brooks,Nicole L, AU - Oguntibeju,Oluwafemi O, Y1 - 2015/07/16/ PY - 2015/01/30/received PY - 2015/07/02/accepted PY - 2015/7/17/entrez PY - 2015/7/17/pubmed PY - 2016/2/13/medline SP - 236 EP - 236 JF - BMC complementary and alternative medicine JO - BMC Complement Altern Med VL - 15 N2 - BACKGROUND: Alteration in antioxidant defence and increase in oxidative stress that results in tissue injury is characteristic of diabetes. We evaluated the protective effects of kolaviron (a flavonoid complex extracted from the seeds of Garcinia kola) on hepatic antioxidants, lipid peroxidation and apoptosis in diabetic rats. METHODS: To induce diabetes, rats were injected with streptozotocin intraperitoneally at a single dose of 50 mg/kg. Kolaviron (100 mg/kg) was administered orally for 6 weeks (5 times weekly). Activities of liver antioxidant enzymes was analysed with Multiskan Spectrum plate reader. High performance liquid chromatography (HPLC) was used in the analysis of MDA (malondialdehyde), a product of lipid peroxidation. Apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay. RESULT: Diabetic rats exhibited a significant increase in the peroxidation of hepatic lipids as observed from the elevated level of malondialdehyde (MDA). In addition, Oxygen Radical Absorbance Capacity (ORAC), level of reduced glutathione (GSH), ratio of reduced to oxidized glutathione (GSH: GSSG) and catalase (CAT) activity were decreased in the liver of diabetic rats. The activities of GPX (glutathione peroxidase) and SOD (superoxide dismutase) were unaltered in diabetic rats. TUNEL assay revealed increased apoptotic cell death in the liver. Kolaviron attenuated lipid peroxidation and apoptosis, increased CAT activity, GSH levels and GSH: GSSG ratio. The ORAC of kolaviron-treated diabetic liver was restored to near-normal values. CONCLUSION: Kolaviron protects the liver against oxidative and apoptotic damage induced by hyperglycemia. SN - 1472-6882 UR - https://www.unboundmedicine.com/medline/citation/26179065/Effects_of_kolaviron_on_hepatic_oxidative_stress_in_streptozotocin_induced_diabetes_ L2 - https://bmccomplementalternmed.biomedcentral.com/articles/10.1186/s12906-015-0760-y DB - PRIME DP - Unbound Medicine ER -