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Upregulation of catalase and downregulation of glutathione peroxidase activity in the kidney precede the development of hypertension in pre-hypertensive SHR.
Hypertens Res. 2013 Mar; 36(3):213-8.HR

Abstract

Although oxidative stress has been implicated in the pathogenesis of hypertension in spontaneously hypertensive rats (SHRs), there is little information on the levels of primary antioxidant enzymes status (AOEs) in pre-hypertensive SHR. This study therefore determined the activities of primary AOEs and their mRNA levels, levels of hydrogen peroxide (H2O2), malondialdehyde (MDA) and total antioxidant status (TAS) in whole kidneys of SHR and age-matched Wistar-Kyoto (WKY) rats aged between 2 and 16 weeks. Compared with age-matched WKY rats, catalase (CAT) activity was significantly higher from the age of 2 weeks (P<0.001) and glutathione peroxide (GPx) activity was lower from the age of 3 weeks (P<0.001) in SHR. CAT mRNA levels were significantly higher in SHR aged 2, 4, 6 and 12 weeks. GPx mRNA levels were significantly lower in SHR at 8 and 12 weeks. Superoxide dismutase activity or its mRNA levels were not different between the two strains. H2O2 levels were significantly lower in SHR from the age of 8 weeks (P<0.01). TAS was significantly higher in SHR from the age of 3 weeks (P<0.05). MDA levels were only significantly higher at 16 weeks of age in the SHR (P<0.05). The data suggest that altered renal CAT and GPx mRNA expression and activity precede the development of hypertension in SHR. The raised CAT activity perhaps contributes to the higher TAS and lower H2O2 levels in SHR. In view of these findings, the precise role of oxidative stress in the pathogenesis of hypertension in SHR needs to be investigated further.

Authors+Show Affiliations

Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian, Kelantan, Malaysia.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23096233

Citation

Sundaram, Arunkumar, et al. "Upregulation of Catalase and Downregulation of Glutathione Peroxidase Activity in the Kidney Precede the Development of Hypertension in Pre-hypertensive SHR." Hypertension Research : Official Journal of the Japanese Society of Hypertension, vol. 36, no. 3, 2013, pp. 213-8.
Sundaram A, Siew Keah L, Sirajudeen KN, et al. Upregulation of catalase and downregulation of glutathione peroxidase activity in the kidney precede the development of hypertension in pre-hypertensive SHR. Hypertens Res. 2013;36(3):213-8.
Sundaram, A., Siew Keah, L., Sirajudeen, K. N., & Singh, H. J. (2013). Upregulation of catalase and downregulation of glutathione peroxidase activity in the kidney precede the development of hypertension in pre-hypertensive SHR. Hypertension Research : Official Journal of the Japanese Society of Hypertension, 36(3), 213-8. https://doi.org/10.1038/hr.2012.163
Sundaram A, et al. Upregulation of Catalase and Downregulation of Glutathione Peroxidase Activity in the Kidney Precede the Development of Hypertension in Pre-hypertensive SHR. Hypertens Res. 2013;36(3):213-8. PubMed PMID: 23096233.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Upregulation of catalase and downregulation of glutathione peroxidase activity in the kidney precede the development of hypertension in pre-hypertensive SHR. AU - Sundaram,Arunkumar, AU - Siew Keah,Lee, AU - Sirajudeen,Kuttulebbai Nainamohamed Salam, AU - Singh,Harbindar Jeet, Y1 - 2012/10/25/ PY - 2012/10/26/entrez PY - 2012/10/26/pubmed PY - 2013/8/27/medline SP - 213 EP - 8 JF - Hypertension research : official journal of the Japanese Society of Hypertension JO - Hypertens Res VL - 36 IS - 3 N2 - Although oxidative stress has been implicated in the pathogenesis of hypertension in spontaneously hypertensive rats (SHRs), there is little information on the levels of primary antioxidant enzymes status (AOEs) in pre-hypertensive SHR. This study therefore determined the activities of primary AOEs and their mRNA levels, levels of hydrogen peroxide (H2O2), malondialdehyde (MDA) and total antioxidant status (TAS) in whole kidneys of SHR and age-matched Wistar-Kyoto (WKY) rats aged between 2 and 16 weeks. Compared with age-matched WKY rats, catalase (CAT) activity was significantly higher from the age of 2 weeks (P<0.001) and glutathione peroxide (GPx) activity was lower from the age of 3 weeks (P<0.001) in SHR. CAT mRNA levels were significantly higher in SHR aged 2, 4, 6 and 12 weeks. GPx mRNA levels were significantly lower in SHR at 8 and 12 weeks. Superoxide dismutase activity or its mRNA levels were not different between the two strains. H2O2 levels were significantly lower in SHR from the age of 8 weeks (P<0.01). TAS was significantly higher in SHR from the age of 3 weeks (P<0.05). MDA levels were only significantly higher at 16 weeks of age in the SHR (P<0.05). The data suggest that altered renal CAT and GPx mRNA expression and activity precede the development of hypertension in SHR. The raised CAT activity perhaps contributes to the higher TAS and lower H2O2 levels in SHR. In view of these findings, the precise role of oxidative stress in the pathogenesis of hypertension in SHR needs to be investigated further. SN - 1348-4214 UR - https://www.unboundmedicine.com/medline/citation/23096233/Upregulation_of_catalase_and_downregulation_of_glutathione_peroxidase_activity_in_the_kidney_precede_the_development_of_hypertension_in_pre_hypertensive_SHR_ L2 - https://medlineplus.gov/highbloodpressure.html DB - PRIME DP - Unbound Medicine ER -