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Zhang J, Qu HY, Song J, Wei J, Jiang S, Wang L, Wang L, Buggs J, Liu R. Enhanced hemodynamic responses to angiotensin II in diabetes are associated with increased expression and activity of AT1 receptors in the afferent arteriole. Physiol Genomics 2017; 49:531-540. [PMID: 28842434 DOI: 10.1152/physiolgenomics.00025.2017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 08/21/2017] [Accepted: 08/21/2017] [Indexed: 12/28/2022] Open
Abstract
The prevalence of hypertension is about twofold higher in diabetic than in nondiabetic subjects. Hypertension aggravates the progression of diabetic complications, especially diabetic nephropathy. However, the mechanisms for the development of hypertension in diabetes have not been elucidated. We hypothesized that enhanced constrictive responsiveness of renal afferent arterioles (Af-Art) to angiotensin II (ANG II) mediated by ANG II type 1 (AT1) receptors contributes to the development of hypertension in diabetes. In response to an acute bolus intravenous injection of ANG II, alloxan-induced diabetic mice exhibited a higher mean arterial pressure (MAP) (119.1 ± 3.8 vs. 106.2 ± 3.5 mmHg) and a lower renal blood flow (0.25 ± 0.07 vs. 0.52 ± 0.14 ml/min) compared with nondiabetic mice. In response to chronic ANG II infusion, the MAP measured with telemetry increased by 55.8 ± 6.5 mmHg in diabetic mice, but only by 32.3 ± 3.8 mmHg in nondiabetic mice. The mRNA level of AT1 receptor increased by ~10-fold in isolated Af-Art of diabetic mice compared with nondiabetic mice, whereas ANG II type 2 (AT2) receptor expression did not change. The ANG II dose-response curve of the Af-Art was significantly enhanced in diabetic mice. Moreover, the AT1 receptor antagonist, losartan, blocked the ANG II-induced vasoconstriction in both diabetic mice and nondiabetic mice. In conclusion, we found enhanced expression of the AT1 receptor and exaggerated response to ANG II of the Af-Art in diabetes, which may contribute to the increased prevalence of hypertension in diabetes.
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Affiliation(s)
- Jie Zhang
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Helena Y Qu
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Jiangping Song
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Jin Wei
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Shan Jiang
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Lei Wang
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | - Liqing Wang
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
| | | | - Ruisheng Liu
- Department of Molecular Pharmacology and Physiology, University of South Florida College of Medicine, Tampa, Florida; and
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Johns M, Esmaeili Mohsen Abadi S, Malik N, Lee J, Neumann WL, Rausaria S, Imani-Nejad M, McPherson T, Schober J, Kwon G. Oral administration of SR-110, a peroxynitrite decomposing catalyst, enhances glucose homeostasis, insulin signaling, and islet architecture in B6D2F1 mice fed a high fat diet. Arch Biochem Biophys 2016; 596:126-37. [PMID: 26970045 DOI: 10.1016/j.abb.2016.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 02/23/2016] [Accepted: 03/02/2016] [Indexed: 01/03/2023]
Abstract
Peroxynitrite has been implicated in type 2 diabetes and diabetic complications. As a follow-up study to our previous work on SR-135 (Arch Biochem Biophys 577-578: 49-59, 2015), we provide evidence that this series of compounds are effective when administered orally, and their mechanisms of actions extend to the peripheral tissues. A more soluble analogue of SR-135, SR-110 (from a new class of Mn(III) bis(hydroxyphenyl)-dipyrromethene complexes) was orally administered for 2 weeks to B6D2F1 mice fed a high fat-diet (HFD). Mice fed a HFD for 4 months gained significantly higher body weights compared to lean diet-fed mice (52 ± 1.5 g vs 34 ± 1.3 g). SR-110 (10 mg/kg daily) treatment significantly reduced fasting blood glucose and insulin levels, and enhanced glucose tolerance as compared to HFD control or vehicle (peanut butter) group. SR-110 treatment enhanced insulin signaling in the peripheral organs, liver, heart, and skeletal muscle, and reduced lipid accumulation in the liver. Furthermore, SR-110 increased insulin content, restored islet architecture, decreased islet size, and reduced tyrosine nitration. These results suggest that a peroxynitrite decomposing catalyst is effective in improving glucose homeostasis and restoring islet morphology and β-cell insulin content under nutrient overload.
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Affiliation(s)
- Michael Johns
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | | | - Nehal Malik
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Joshua Lee
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - William L Neumann
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Smita Rausaria
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Maryam Imani-Nejad
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Timothy McPherson
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Joseph Schober
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA
| | - Guim Kwon
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, 62026, USA.
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3
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Johns M, Fyalka R, Shea JA, Neumann WL, Rausaria S, Msengi EN, Imani-Nejad M, Zollars H, McPherson T, Schober J, Wooten J, Kwon G. SR-135, a peroxynitrite decomposing catalyst, enhances β-cell function and survival in B6D2F1 mice fed a high fat diet. Arch Biochem Biophys 2015; 577-578:49-59. [PMID: 25935364 DOI: 10.1016/j.abb.2015.04.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 04/14/2015] [Accepted: 04/17/2015] [Indexed: 02/07/2023]
Abstract
Peroxynitrite has been implicated in β-cell dysfunction and insulin resistance in obesity. Chemical catalysts that destroy peroxynitrite, therefore, may have therapeutic value for treating type 2 diabetes. To this end, we have recently demonstrated that Mn(III) bis(hydroxyphenyl)-dipyrromethene complexes, SR-135 and its analogs, can effectively catalyze the decomposition of peroxynitrite in vitro and in vivo through a 2-electron mechanism (Rausaria et al., 2011). To study the effects of SR-135 on glucose homeostasis in obesity, B6D2F1 mice were fed with a high fat-diet (HFD) for 12 weeks and treated with vehicle, SR-135 (5mg/kg), or a control drug SRB for 2 weeks. SR-135 significantly reduced fasting blood glucose and insulin levels, and enhanced glucose tolerance as compared to HFD control, vehicle or SRB. SR-135 also enhanced glucose-stimulated insulin secretion based on ex vivo studies. Moreover, SR-135 increased insulin content, restored islet architecture, decreased islet size, and reduced tyrosine nitration and apoptosis. These results suggest that a peroxynitrite decomposing catalyst enhances β-cell function and survival under nutrient overload.
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Affiliation(s)
- Michael Johns
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Robert Fyalka
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Jennifer A Shea
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - William L Neumann
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Smita Rausaria
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Eliwaza Naomi Msengi
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Maryam Imani-Nejad
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Harry Zollars
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Timothy McPherson
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Joseph Schober
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Joshua Wooten
- Department of Kinesiology and Health Education, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States
| | - Guim Kwon
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL 62026, United States.
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4
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Batinic-Haberle I, Tovmasyan A, Roberts ERH, Vujaskovic Z, Leong KW, Spasojevic I. SOD therapeutics: latest insights into their structure-activity relationships and impact on the cellular redox-based signaling pathways. Antioxid Redox Signal 2014; 20:2372-415. [PMID: 23875805 PMCID: PMC4005498 DOI: 10.1089/ars.2012.5147] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 06/30/2013] [Accepted: 07/22/2013] [Indexed: 01/23/2023]
Abstract
SIGNIFICANCE Superoxide dismutase (SOD) enzymes are indispensable and ubiquitous antioxidant defenses maintaining the steady-state levels of O2·(-); no wonder, thus, that their mimics are remarkably efficacious in essentially any animal model of oxidative stress injuries thus far explored. RECENT ADVANCES Structure-activity relationship (half-wave reduction potential [E1/2] versus log kcat), originally reported for Mn porphyrins (MnPs), is valid for any other class of SOD mimics, as it is dominated by the superoxide reduction and oxidation potential. The biocompatible E1/2 of ∼+300 mV versus normal hydrogen electrode (NHE) allows powerful SOD mimics as mild oxidants and antioxidants (alike O2·(-)) to readily traffic electrons among reactive species and signaling proteins, serving as fine mediators of redox-based signaling pathways. Based on similar thermodynamics, both SOD enzymes and their mimics undergo similar reactions, however, due to vastly different sterics, with different rate constants. CRITICAL ISSUES Although log kcat(O2·(-)) is a good measure of therapeutic potential of SOD mimics, discussions of their in vivo mechanisms of actions remain mostly of speculative character. Most recently, the therapeutic and mechanistic relevance of oxidation of ascorbate and glutathionylation and oxidation of protein thiols by MnP-based SOD mimics and subsequent inactivation of nuclear factor κB has been substantiated in rescuing normal and killing cancer cells. Interaction of MnPs with thiols seems to be, at least in part, involved in up-regulation of endogenous antioxidative defenses, leading to the healing of diseased cells. FUTURE DIRECTIONS Mechanistic explorations of single and combined therapeutic strategies, along with studies of bioavailability and translational aspects, will comprise future work in optimizing redox-active drugs.
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Affiliation(s)
- Ines Batinic-Haberle
- Department of Radiation Oncology, Duke University Medical School, Durham, North Carolina
| | - Artak Tovmasyan
- Department of Radiation Oncology, Duke University Medical School, Durham, North Carolina
| | - Emily R. H. Roberts
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | - Zeljko Vujaskovic
- Department of Radiation Oncology, Duke University Medical School, Durham, North Carolina
| | - Kam W. Leong
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
- King Abdulaziz University, Jeddah, Saudi Arabia Kingdom
| | - Ivan Spasojevic
- Department of Medicine, Duke University Medical School, Durham, North Carolina
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5
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Deeb RS, Nuriel T, Cheung C, Summers B, Lamon BD, Gross SS, Hajjar DP. Characterization of a cellular denitrase activity that reverses nitration of cyclooxygenase. Am J Physiol Heart Circ Physiol 2013; 305:H687-98. [PMID: 23792683 PMCID: PMC3761327 DOI: 10.1152/ajpheart.00876.2012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 06/20/2013] [Indexed: 12/11/2022]
Abstract
Protein 3-nitrotyrosine (3-NT) formation is frequently regarded as a simple biomarker of disease, an irreversible posttranslational modification that can disrupt protein structure and function. Nevertheless, evidence that protein 3-NT modifications may be site selective and reversible, thus allowing for physiological regulation of protein activity, has begun to emerge. We have previously reported that cyclooxygenase (COX)-1 undergoes heme-dependent nitration of Tyr(385), an internal and catalytically essential residue. In the present study, we demonstrate that nitrated COX-1 undergoes a rapid reversal of nitration by substrate-selective and biologically regulated denitrase activity. Using nitrated COX-1 as a substrate, denitrase activity was validated and quantified by analytic HPLC with electrochemical detection and determined to be constitutively active in murine and human endothelial cells, macrophages, and a variety of tissue samples. Smooth muscle cells, however, contained little denitrase activity. Further characterizing this denitrase activity, we found that it was inhibited by free 3-NT and may be enhanced by endogenous nitric oxide and exogenously administered carbon monoxide. Finally, we describe a purification protocol that results in significant enrichment of a discrete denitrase-containing fraction, which maintains activity throughout the purification process. These findings reveal that nitrated COX-1 is a substrate for a denitrase in cells and tissues, implying that the reciprocal processes of nitration and denitration may modulate bioactive lipid synthesis in the setting of inflammation. In addition, our data reveal that denitration is a controlled process that may have broad importance for regulating cell signaling events in nitric oxide-generating systems during oxidative/nitrosative stress.
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MESH Headings
- Adaptation, Physiological/physiology
- Animals
- Cell Line
- Cells, Cultured
- Cyclooxygenase 1/metabolism
- Endothelium, Vascular/cytology
- Endothelium, Vascular/metabolism
- Humans
- Macrophages/cytology
- Macrophages/metabolism
- Mice
- Mice, Inbred C57BL
- Models, Animal
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Nitrates/metabolism
- Nitric Oxide/metabolism
- Nitric Oxide Synthase/metabolism
- Oxidative Stress/physiology
- Oxidoreductases/metabolism
- Rats
- Tyrosine/analogs & derivatives
- Tyrosine/metabolism
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Affiliation(s)
- Ruba S Deeb
- Department of Pathology, Weill Cornell Medical College, Cornell University, New York, New York
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6
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Quilley J, Santos M, Pedraza P. Renal protective effect of chronic inhibition of COX-2 with SC-58236 in streptozotocin-diabetic rats. Am J Physiol Heart Circ Physiol 2011; 300:H2316-22. [PMID: 21441310 DOI: 10.1152/ajpheart.01259.2010] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The induction of renal cyclooxygenase-2 (COX-2) in diabetes has been implicated in the renal functional and structural changes in models where hypertension or uninephrectomy was superimposed. We examined the protective effects of 3 mo treatment of streptozotocin-diabetic rats with a highly selective COX-2 inhibitor (SC-58236) in terms of albuminuria, renal hypertrophy, and the excretion of TNF-α and TGF-β, which have also been implicated in the detrimental renal effects of diabetes. SC-58236 treatment (3 mg·kg(-1)·day(-1)) of diabetic rats resulted in reduced urinary excretion of PGE(2), 6-ketoPGF(1α), and thromboxane B(2), all of which were increased in the diabetic rat compared with age-matched nondiabetic rats. However, serum thromboxane B(2) levels were unchanged, confirming the selectivity of SC-58236 for COX-2. The renal protective effects of treatment of diabetic rats with the COX-2 inhibitor were reflected by a marked reduction in albuminuria, a reduction in kidney weight-to-body weight ratio, and TGF-β excretion and a marked decrease in the urinary excretion of TNF-α. The protective effects of SC-58236 were independent of changes in plasma glucose levels or serum advanced glycation end-product levels, which were not different from those of untreated diabetic rats. In an additional study, the inhibition of COX-2 with SC-58236 for 4 wk in diabetic rats resulted in creatinine clearance rates not different from those of control rats. These results confirm that the inhibition of COX-2 in the streptozotocin-diabetic rat confers renal protection and suggest that the induction of COX-2 precedes the increases in cytokines, TNF-α, and TGF-β.
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Affiliation(s)
- J Quilley
- Dept. of Pharmacology, New York Medical College, Valhalla, NY 10595, USA.
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