1
|
Moreira NJD, Dos Santos F, Moreira ED, Farah D, de Souza LE, da Silva MB, Moraes-Silva IC, Lincevicius GS, Caldini EG, Irigoyen MCC. Acute renal denervation normalizes aortic function and decreases blood pressure in spontaneously hypertensive rats. Sci Rep 2020; 10:21826. [PMID: 33311525 PMCID: PMC7733454 DOI: 10.1038/s41598-020-78674-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 11/03/2020] [Indexed: 11/09/2022] Open
Abstract
Mechanisms involved in the acute responses to renal denervation (RDN) have yet to be fully understood. We assessed urinary volume, autonomic control and aorta vascular reactivity after acute RDN. Male normotensive Wistar rats and spontaneously hypertensive rats (SHR) were divided into normotensive + RDN (ND) or sham surgery (NS), and hypertensive + RDN (HD) or sham surgery (HS). Metabolic parameters and hemodynamic measurements were recorded 72h and 4 days after intervention, respectively. Aortic rings were studied 7 days post RDN in an isometric myograph. Concentration–response curves to phenylephrine, sodium nitroprusside and acetylcholine (10–10–10−5 M) were performed. Two-way ANOVA was used for group comparisons and differences reported when p < 0.05. Results are presented as mean ± SEM. Urinary volume was 112% higher in HD vs. HS (HS = 14.94 ± 2.5 mL; HD = 31.69 ± 2.2 mL) and remained unchanged in normotensive rats. Systolic BP was lower in HD rats (HS = 201 ± 12 vs. HD = 172 ± 3 mmHg) without changes in normotensive group. HD group showed increased HF and LF modulation (HS = 5.8 ± 0.7 ms2vs. HD = 13.4 ± 1.4 ms2; HS = 3.5 ± 0.7 ms2vs. HD = 10.5 ± 1.7 ms2, respectively). RDN normalized vascular reactivity in HD rats and increased phenylephrine response in ND rats. Acute fall in BP induced by RDN is associated with increased urinary volume, which in turn may also have contributed to functional changes of the aorta.
Collapse
Affiliation(s)
- Nathalia Juocys Dias Moreira
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Fernando Dos Santos
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Edson Dias Moreira
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Daniela Farah
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Leandro Eziquiel de Souza
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Maikon Barbosa da Silva
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Ivana Cinthya Moraes-Silva
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil
| | - Gisele Silvério Lincevicius
- Instituto do Coração da Faculdade de Medicina da Universidade de São Paulo (InCor-FMUSP), São Paulo, Brazil.,Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM - UNIFESP), São Paulo, Brazil
| | - Elia Garcia Caldini
- Departamento de Patologia, Faculdade de Medicina da Universidade de São Paulo (HC-FMUSP), São Paulo, Brazil
| | | |
Collapse
|
2
|
Azouz AA, Abdel-Nassir Abdel-Razek E, Abo-Youssef AM. Amlodipine alleviates cisplatin-induced nephrotoxicity in rats through gamma-glutamyl transpeptidase (GGT) enzyme inhibition, associated with regulation of Nrf2/HO-1, MAPK/NF-κB, and Bax/Bcl-2 signaling. Saudi Pharm J 2020; 28:1317-1325. [PMID: 33250641 PMCID: PMC7679434 DOI: 10.1016/j.jsps.2020.08.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 08/27/2020] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The therapeutic utility of the effective chemotherapeutic agent cisplatin is hampered by its nephrotoxic effect. We aimed from the current study to examine the possible protective effects of amlodipine through gamma-glutamyl transpeptidase (GGT) enzyme inhibition against cisplatin nephrotoxicity. METHODS Amlodipine (5 mg/kg, po) was administered to rats for 14 successive days. On the 10th day, nephrotoxicity was induced by a single dose of cisplatin (6.5 mg/kg, ip). On the last day, blood samples were collected for estimation of kidney function, while kidney samples were used for determination of GGT activity, oxidative stress, inflammatory, and apoptotic markers, along with histopathological evaluation. RESULTS Amlodipine alleviated renal injury that was manifested by significantly diminished serum creatinine and blood urea nitrogen levels, compared to cisplatin group. Amlodipine inhibited GGT enzyme, which participates in the metabolism of extracellular glutathione (GSH) and platinum-GSH-conjugates to a reactive toxic thiol. Besides, amlodipine diminished mRNA expression of NADPH oxidase in the kidney, while enhanced the anti-oxidant defense by activating Nrf2/HO-1 signaling. Additionally, it showed marked anti-inflammatory response by reducing expressions of p38 mitogen-activated protein kinase (p38 MAPK) and nuclear factor-kappa B (NF-κB), with subsequent down-regulation of tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and vascular cell adhesion molecule-1 (VCAM-1). Moreover, amlodipine reduced Bax/Bcl-2 ratio and elevated hepatocyte growth factor (HGF), thus favoring renal cell survival. CONCLUSIONS Effective GGT inhibition by amlodipine associated with enhancement of anti-oxidant defense and suppression of inflammatory signaling and apoptosis support our suggestion that amlodipine could replace toxic GGT inhibitors in protection against cisplatin nephrotoxicity.
Collapse
Key Words
- Amlodipine
- Anti-inflammatory response
- Anti-oxidant defense
- BUN, Blood urea nitrogen
- Bax, Bcl-2-associated X protein
- Bcl-2, B-cell lymphoma 2
- CMC, Carboxymethyl cellulose
- Cisplatin nephrotoxicity
- GGT inhibition
- GGT, gamma-glutamyl transpeptidase
- GSH, Reduced glutathione
- H & E, Hematoxylin and eosin
- HGF, Hepatocyte growth factor
- HO-1, Heme oxygenase-1
- IL-6, Interleukin-6
- Keap1, Kelch-like ECH-associated protein 1
- MAPK, Mitogen-activated protein kinase
- MDA, Malondialdehyde
- NADPH, Nicotinamide adenine dinucleotide phosphate
- NF-κB, Nuclear factor-kappa B
- NO, Nitric oxide
- NOx, Total nitrate/nitrite
- Nrf2, Nuclear factor erythroid 2-related factor 2
- ROS, Reactive oxygen species
- Renal cell survival
- TNF-α, Tumor necrosis factor-alpha
- VCAM-1, vascular cell adhesion molecule-1
Collapse
Affiliation(s)
- Amany A. Azouz
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | | | - Amira M. Abo-Youssef
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| |
Collapse
|
3
|
Abdulla MH, Brennan N, Ryan E, Sweeney L, Manning J, Johns EJ. Tacrolimus restores the high‐ and low‐pressure baroreflex control of renal sympathetic nerve activity in cisplatin‐induced renal injury rats. Exp Physiol 2019; 104:1726-1736. [DOI: 10.1113/ep087829] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 08/22/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Mohammed H. Abdulla
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| | - Nicola Brennan
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| | - Eimear Ryan
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| | - Linda Sweeney
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| | - Jennifer Manning
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| | - Edward J. Johns
- Department of Physiology, Western Gateway Building University College Cork College Road Cork Ireland
| |
Collapse
|
4
|
Inhibition of α2C-adrenoceptors ameliorates cisplatin-induced acute renal failure in rats. Eur J Pharmacol 2018; 838:113-119. [PMID: 30201375 DOI: 10.1016/j.ejphar.2018.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 09/05/2018] [Accepted: 09/05/2018] [Indexed: 11/23/2022]
Abstract
Nephrotoxicity is a major adverse reaction of the anticancer drug, cisplatin. We investigated the renoprotective effects of the α2-adrenoceptor antagonist, yohimbine and selective α2C-adrenoceptor antagonist, JP-1302, in cisplatin-treated Sprague Dawley rats. Rats were given a single intravenous dose of 7.5 mg/kg cisplatin and then yohimbine or JP-1302 was administered intraperitoneally at 0.1 or 3 mg/kg/day, respectively, for four days. Renal functional parameters, such as blood urea nitrogen, plasma creatinine, creatinine clearance and renal venous norepinephrine concentrations were measured. Kidney tissue damage and tumour necrosis factor-α (TNF-α) and monocyte chemoattractant protein-1 (MCP-1) mRNA levels were assessed after the animals were euthanized. Cisplatin treatment aggravated the kidney functional parameters of blood urea nitrogen, plasma creatinine and creatinine clearance. Renal venous norepinephrine concentrations were also elevated after cisplatin administration. Treatment with yohimbine or JP-1302 clearly ameliorated kidney function and cell apoptosis. These treatments suppressed elevated renal plasma norepinephrine, TNF-α, MCP-1 and cleaved caspase 3 expressions which occurred after administration of cisplatin. These results suggest that yohimbine can prevent cisplatin-induced renal toxicity associated with acute kidney injury by suppressing cytokine expression through α2C-adrenoceptors.
Collapse
|
5
|
Abdel-Wahab WM, Moussa FI, Saad NA. Synergistic protective effect of N-acetylcysteine and taurine against cisplatin-induced nephrotoxicity in rats. Drug Des Devel Ther 2017; 11:901-908. [PMID: 28356716 PMCID: PMC5367759 DOI: 10.2147/dddt.s131316] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Cisplatin (cis-diaminedichloroplatinum II; CDDP) is an effective anticancer drug, but it has limitations because of its nephrotoxicity. This study investigates the protective effect of N-acetylcysteine (NAC) and taurine (TAU), both individually and in combination, against CDDP nephrotoxicity in rats. For this purpose, 48 male rats were assigned into eight groups (n=6) as follows: 1) control group, 2) NAC group, 3) TAU group, 4) NAC-TAU group, 5) CDDP group, 6) CDDP-NAC group, 7) CDDP-TAU group, and 8) CDDP-NAC-TAU group. Cisplatin was administered as a single intraperitoneal injection at a concentration of 6 mg/kg. Three days after CDDP administration, NAC (50 mg/kg) and/or TAU (50 mg/kg) were administered three times weekly for four consecutive weeks. Kidney function markers in serum, urinary glucose and protein, as well as oxidant and antioxidant parameters in renal tissue were assessed. Administration of CDDP significantly elevated urinary glucose and protein, as well as serum creatinine, urea, and uric acid. Moreover, CDDP enhanced lipid peroxidation and suppressed the major enzymatic antioxidants in the kidney tissue. Treatment with NAC or TAU protected against the alterations in the serum, urine, and renal tissue when used individually along with CDDP. Furthermore, a combined therapy of both was more effective in ameliorating CDDP-induced nephrotoxicity, which points out to their synergistic effect.
Collapse
Affiliation(s)
- Wessam M Abdel-Wahab
- Department of Biology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
- Department of Zoology, Faculty of Science, University of Alexandria, Alexandria, Egypt
| | - Farouzia I Moussa
- Department of Zoology, Faculty of Science, University of Alexandria, Alexandria, Egypt
| | - Najwa A Saad
- Department of Zoology, Faculty of Science, University of Benghazi, Benghazi, Libya
| |
Collapse
|
6
|
Ryazanova MA, Fedoseeva LA, Ershov NI, Efimov VM, Markel AL, Redina OE. The gene-expression profile of renal medulla in ISIAH rats with inherited stress-induced arterial hypertension. BMC Genet 2016; 17:151. [PMID: 28105926 PMCID: PMC5249016 DOI: 10.1186/s12863-016-0462-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background The changes in the renal function leading to a reduction of medullary blood flow can have a great impact on sodium and water homeostasis and on the long-term control of arterial blood pressure. The RNA-Seq approach was used for transcriptome profiling of the renal medulla from hypertensive ISIAH and normotensive WAG rats to uncover the genetic basis of the changes underlying the renal medulla function in the ISIAH rats being a model of the stress-sensitive arterial hypertension and to reveal the genes which possibly may contribute to the alterations in medullary blood flow. Results Multiple DEGs specifying the function of renal medulla in ISIAH rats were revealed. The group of DEGs described by Gene Ontology term ‘oxidation reduction’ was the most significantly enriched one. The other groups of DEGs related to response to external stimulus, response to hormone (endogenous) stimulus, response to stress, and homeostatic process provide the molecular basis for integrated responses to homeostasis disturbances in the renal medulla of the ISIAH rats. Several DEGs, which may modulate the renal medulla blood flow, were detected. The reduced transcription of Nos3 pointed to the possible reduction of the blood flow in the renal medulla of ISIAH rats. Conclusions The generated data may be useful for comparison with those from different models of hypertension and for identifying the common molecular determinants contributing to disease manifestation, which may be potentially used as new pharmacological targets. Electronic supplementary material The online version of this article (doi:10.1186/s12863-016-0462-6) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Marina A Ryazanova
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Larisa A Fedoseeva
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Nikita I Ershov
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation
| | - Vadim M Efimov
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.,Novosibirsk State University, Novosibirsk, Russian Federation
| | - Arcady L Markel
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.,Novosibirsk State University, Novosibirsk, Russian Federation
| | - Olga E Redina
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
| |
Collapse
|
7
|
Fedoseeva LA, Ryazanova MA, Ershov NI, Markel AL, Redina OE. Comparative transcriptional profiling of renal cortex in rats with inherited stress-induced arterial hypertension and normotensive Wistar Albino Glaxo rats. BMC Genet 2016; 17 Suppl 1:12. [PMID: 26821914 PMCID: PMC4895253 DOI: 10.1186/s12863-015-0306-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background The renal function plays a leading role in long-term control of arterial pressure. The comparative analysis of renal cortex transcriptome in ISIAH rats with inherited stress-induced arterial hypertension and normotensive WAG rats was performed using RNA-Seq approach. The goal of the study was to identify the differentially expressed genes (DEGs) related to hypertension and to detect the pathways contributing to the differences in renal functions in ISIAH and WAG rats. Results The analysis revealed 716 genes differentially expressed in renal cortex of ISIAH and WAG rats, 42 of them were associated with arterial hypertension and regulation of blood pressure (BP). Several Gene Ontology (GO) terms significantly enriched with DEGs suggested the existence of the hormone dependent interstrain differences in renal cortex function. Multiple DEGs were associated with regulation of blood pressure and blood circulation, with the response to stress (including oxidative stress, hypoxia, and fluid shear stress) and its regulation. Several other processes which may contribute to hypertension development in ISIAH rats were: ion transport, regulation of calcium ion transport, homeostatic process, tissue remodeling, immune system process and regulation of immune response. KEGG analysis marked out several pathways significantly enriched with DEGs related to immune system function, to steroid hormone biosynthesis, tryptophan, glutathione, nitrogen, and drug metabolism. Conclusions The results of the study provide a basis for identification of potential biomarkers of stress-sensitive hypertension and for further investigation of the mechanisms that affect renal cortex function and hypertension development. Electronic supplementary material The online version of this article (doi:10.1186/s12863-015-0306-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Larisa A Fedoseeva
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
| | - Marina A Ryazanova
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
| | - Nikita I Ershov
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
| | - Arcady L Markel
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation. .,Novosibirsk State University, Novosibirsk, Russian Federation.
| | - Olga E Redina
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian Federation.
| |
Collapse
|
8
|
Goulding NE, Johns EJ. Neural regulation of the kidney function in rats with cisplatin induced renal failure. Front Physiol 2015; 6:192. [PMID: 26175693 PMCID: PMC4485160 DOI: 10.3389/fphys.2015.00192] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 06/19/2015] [Indexed: 12/21/2022] Open
Abstract
Aim: Chronic kidney disease (CKD) is often associated with a disturbed cardiovascular homeostasis. This investigation explored the role of the renal innervation in mediating deranged baroreflex control of renal sympathetic nerve activity (RSNA) and renal excretory function in cisplatin-induced renal failure. Methods: Rats were either intact or bilaterally renally denervated 4 days prior to receiving cisplatin (5 mg/kg i.p.) and entered a chronic metabolic study for 8 days. At day 8, other groups of rats were prepared for acute measurement of RSNA or renal function with either intact or denervated kidneys. Results: Following the cisplatin challenge, creatinine clearance was 50% lower while fractional sodium excretion and renal cortical and medullary TGF-β1 concentrations were 3–4 fold higher in both intact and renally denervated rats compared to control rats. In cisplatin-treated rats, the maximal gain of the high-pressure baroreflex curve was only 20% that of control rats, but following renal denervation not different from that of renally denervated control rats. Volume expansion reduced RSNA by 50% in control and in cisplatin-treated rats but only following bilateral renal denervation. The volume expansion mediated natriuresis/diuresis was absent in the cisplatin-treated rats but was normalized following renal denervation. Conclusions: Cisplatin-induced renal injury impaired renal function and caused a sympatho-excitation with blunting of high and low pressure baroreflex regulation of RSNA, which was dependent on the renal innervation. It is suggested that in man with CKD there is a dysregulation of the neural control of the kidney mediated by its sensory innervation.
Collapse
Affiliation(s)
- Niamh E Goulding
- Renal Research Laboratory, Department of Physiology, University College Cork Cork, Ireland
| | - Edward J Johns
- Renal Research Laboratory, Department of Physiology, University College Cork Cork, Ireland
| |
Collapse
|
9
|
Ahmad A, Sattar MA, Rathore HA, Abdulla MH, Khan SA, Abdullah NA, Kaur G, Johns EJ. Functional contribution of α1D-adrenoceptors in the renal vasculature of left ventricular hypertrophy induced with isoprenaline and caffeine in Wistar-Kyoto rats. Can J Physiol Pharmacol 2014; 92:1029-35. [PMID: 25403946 DOI: 10.1139/cjpp-2014-0236] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigated the role of α1D-adrenoceptor in the modulation of renal haemodynamics in rats with left ventricular hypertrophy (LVH). LVH was established in Wistar-Kyoto (WKY) rats with isoprenaline (5.0 mg · (kg body mass)(-1), by subcutaneous injection every 72 h) and caffeine (62 mg · L(-1) in drinking water, daily for 14 days). Renal vasoconstrictor responses were measured for noradrenaline (NA), phenylephrine (PE), and methoxamine (ME) before and immediately after low or high dose intrarenal infusions of BMY 7378, a selective α1D-adrenoceptor blocker. The rats with LVH had higher mean arterial blood pressure and circulating NA levels, but lower renal cortical blood perfusion compared with the control group (all P < 0.05). In the LVH group, the magnitude of the renal vasoconstrictor response to ME was blunted, but not the response to NA or PE (P < 0.05), compared with the control group (LVH vs. C, 38% vs. 50%). The magnitude of the drop in the vasoconstrictor responses to NA, PE, and ME in the presence of a higher dose of BMY 7378 was significantly greater in the LVH group compared with the control group (LVH vs. C, 45% vs. 25% for NA, 52% vs. 33% for PE, 66% vs. 53% for ME, all P < 0.05). These findings indicate an impaired renal vasoconstrictor response to adrenergic agonists during LVH. In addition, the α1D-adrenoceptor subtype plays a key role in the modulation of vascular responses in this diseased state.
Collapse
Affiliation(s)
- Ashfaq Ahmad
- a School of Pharmaceutical Sciences, University Sains Malaysia, Penang 11800, Malaysia
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Khan SA, Sattar MA, Rathore HA, Abdulla MH, ud din Ahmad F, Ahmad A, Afzal S, Abdullah NA, Johns EJ. Renal denervation restores the baroreflex control of renal sympathetic nerve activity and heart rate in Wistar-Kyoto rats with cisplatin-induced renal failure. Acta Physiol (Oxf) 2014; 210:690-700. [PMID: 24438102 DOI: 10.1111/apha.12237] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 10/04/2013] [Accepted: 01/10/2014] [Indexed: 12/14/2022]
Abstract
AIM There is evidence that in chronic renal failure, the sympathetic nervous system is activated. This study investigated the role of the renal innervation in suppressing high- and low-pressure baroreflex control of renal sympathetic nerve activity and heart rate in cisplatin-induced renal failure. METHODS Renal failure was induced using cisplatin (5 mg kg(-1) , i.p.) and the rats used 7 days later. Groups of rats were anaesthetized and prepared for measurement of renal sympathetic nerve activity and heart rate. Acute unilateral or bilateral renal denervation was performed, and renal sympathetic nerve activity and heart rate baroreflex gain curves were generated while the cardiopulmonary receptors were stimulated using an acute saline volume load. RESULTS Cisplatin administration reduced (P < 0.05) glomerular filtration rate by 27%, increased sodium fractional excretions fourfold, plasma creatinine and kidney index by 39 and 30% respectively, (all P < 0.05) compared with control rats. In the renal failure rats, baroreflex sensitivity for renal sympathetic nerve activity and heart rate was reduced (P < 0.05) by 29% and 27% (both P < 0.05) compared with control animals. Bilateral, but not unilateral, renal denervation restored baroreflex sensitivity to normal values. Volume expansion reduced (P < 0.05) renal sympathetic nerve activity by 34% in control rats, but remained unchanged in the renal failure rats. Unilateral and bilateral renal denervation progressively restored the volume expansion induced renal sympathoinhibition to control values. CONCLUSION These findings reveal a significant role of the renal sensory innervation in cisplatin-damaged kidneys which blunt the normal baroreflex control of renal sympathetic nerve activity.
Collapse
Affiliation(s)
- S. A. Khan
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - M. A. Sattar
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - H. A. Rathore
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - M. H. Abdulla
- Department of Physiology; University College Cork; Cork Ireland
| | - F. ud din Ahmad
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - A. Ahmad
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - S. Afzal
- Department of Physiology; School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - N. A. Abdullah
- Department of Pharmacology; Faculty of Medicine; Universiti Malaya; Kuala Lumpur Malaysia
| | - E. J. Johns
- Department of Physiology; University College Cork; Cork Ireland
| |
Collapse
|
11
|
dos Santos NAG, Carvalho Rodrigues MA, Martins NM, dos Santos AC. Cisplatin-induced nephrotoxicity and targets of nephroprotection: an update. Arch Toxicol 2012; 86:1233-50. [PMID: 22382776 DOI: 10.1007/s00204-012-0821-7] [Citation(s) in RCA: 255] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Accepted: 02/14/2012] [Indexed: 01/15/2023]
Abstract
Cisplatin is a highly effective antitumor agent whose clinical application is limited by the inherent nephrotoxicity. The current measures of nephroprotection used in patients receiving cisplatin are not satisfactory, and studies have focused on the investigation of new possible protective strategies. Many pathways involved in cisplatin nephrotoxicity have been delineated and proposed as targets for nephroprotection, and many new potentially protective agents have been reported. The multiple pathways which lead to renal damage and renal cell death have points of convergence and share some common modulators. The most frequent event among all the described pathways is the oxidative stress that acts as both a trigger and a result. The most exploited pathways, the proposed protective strategies, the achievements obtained so far as well as conflicting data are summarized and discussed in this review, providing a general view of the knowledge accumulated with past and recent research on this subject.
Collapse
Affiliation(s)
- Neife Aparecida Guinaim dos Santos
- Department of Clinical, Toxicological Analyses and Food Sciences of School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Brazil
| | | | | | | |
Collapse
|
12
|
Sánchez-González PD, López-Hernández FJ, López-Novoa JM, Morales AI. An integrative view of the pathophysiological events leading to cisplatin nephrotoxicity. Crit Rev Toxicol 2011; 41:803-21. [DOI: 10.3109/10408444.2011.602662] [Citation(s) in RCA: 164] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
13
|
Abdulla MH, Sattar MA, Johns EJ, Abdullah NA, Khan MAH. Evidence for the role of α1A-adrenoceptor subtype in the control of renal haemodynamics in fructose-fed Sprague-Dawley rat. Eur J Nutr 2011; 50:689-97. [PMID: 21373947 DOI: 10.1007/s00394-011-0180-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 02/17/2011] [Indexed: 12/19/2022]
Abstract
AIM To explore the hypothesis that high fructose intake results in a higher functional contribution of α1A-adrenoceptors and blunts the adrenergically and angiotensin II (Ang II)-induced renal vasoconstriction. METHODS Twelve Sprague-Dawley rats received either 20% fructose solution [FFR] or tap water [C] to drink ad libitum for 8 weeks. The renal vasoconstrictor response to noradrenaline (NA), phenylephrine (PE), methoxamine (ME) and Ang II was determined in the presence and absence of 5-methylurapidil (5-MU) (α1A-adrenoceptor antagonist) in a three-phase experiment (pre-drug, low- and high-dose 5-MU). Data, mean ± SEM were analysed by ANOVA or Student's unpaired t-test with significance at P < 0.05. RESULTS FFR exhibited insulin resistance (HOMA index), hypertension and significant increases in plasma levels of glucose and insulin. All agonists caused dose-related reductions in cortical blood perfusion that were larger in C than in FFR while the magnitudes of the responses were progressively reduced with increasing doses of 5-MU in both C and FFR. The degree of 5-MU attenuation of the renal cortical vasoconstriction due to NA, ME and Ang II was significantly greater in the FFR compared to C. CONCLUSIONS Fructose intake for 8 weeks results in smaller vascular response to adrenergic agonists and Ang II. The α1A-adrenoceptor subtype is the functional subtype that mediates renal cortical vasoconstriction in control rats, and this contribution becomes higher due to fructose feeding.
Collapse
Affiliation(s)
- Mohammed H Abdulla
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia.
| | | | | | | | | |
Collapse
|
14
|
Salman IM, Ameer OZ, Sattar MA, Abdullah NA, Yam MF, Abdullah GZ, Abdulkarim MF, Khan MAH, Johns EJ. Renal sympathetic nervous system hyperactivity in early streptozotocin-induced diabetic kidney disease. Neurourol Urodyn 2011; 30:438-46. [PMID: 21284025 DOI: 10.1002/nau.21007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Accepted: 08/31/2010] [Indexed: 12/23/2022]
Abstract
AIM We assessed the role of renal sympathetic nervous system in the deterioration of renal hemodynamic and excretory functions in rats with streptozotocin (STZ)-induced diabetic kidney disease (DKD). METHODS Male Sprague-Dawley (SD) rats were induced with diabetes mellitus (DM) using STZ (55 mg/kg, i.p.). The acute studies were conducted on denervated anesthetized rats 7 days after STZ administration. Two sets of experiments were performed: clearance experiments in which six 20-min urine and plasma collections were carried out to measure kidney function parameters, and hemodynamic experiments in which the renal nerves were electrically stimulated and responses in renal vascular resistance (RVR) and renal blood flow (RBF) were recorded. RESULTS Renal denervation in STZ-induced diabetic rats produced higher fractional excretion of sodium (FE(Na) ) but lower plasma sodium (P(Na) ), glomerular filtration rate (GFR), and plasma creatinine (P(Cr) ) (all P<0.05 vs. innervated diabetic rats). In innervated diabetic rats, renal nerve stimulation (RNS) caused significant attenuation in the renal vasoconstrictor responses (all P<0.05 vs. innervated control). Renal denervation in diabetic rats significantly blunted these responses (all P<0.05 vs. innervated diabetic rats); however, they were significantly higher (all P<0.05) while compared to denervated control counterparts. CONCLUSIONS The data demonstrate an early role for the renal sympathetic innervation in the pathogenesis of DKD. If the kidney is prevented from renal sympathetic nerve action renal functional parameters are markedly improved. The data further suggest an early enhancement in renal sensitivity to intrarenal norepinephrine (NE) upon the removal of renal sympathetic tone in STZ-induced diabetic rats.
Collapse
Affiliation(s)
- Ibrahim M Salman
- Department of Cardiovascular and Renal Physiology and Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia.
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Salman IM, Ameer OZ, Sattar MA, Abdullah NA, Yam MF, Najim HS, Abdul Hye Khan M, Johns EJ. Role of the renal sympathetic nervous system in mediating renal ischaemic injury-induced reductions in renal haemodynamic and excretory functions. Pathology 2010; 42:259-66. [DOI: 10.3109/00313021003631304] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
16
|
Abdelrahman AM, Al Salam S, AlMahruqi AS, Al husseni IS, Mansour MA, Ali BH. N-acetylcysteine improves renal hemodynamics in rats with cisplatin-induced nephrotoxicity. J Appl Toxicol 2010; 30:15-21. [PMID: 19681060 DOI: 10.1002/jat.1465] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This work investigated the effect of N-acetylcysteine (NAC), on renal hemodynamics in cisplatin (CP)-induced nephrotoxicity in Wistar-Kyoto (WKY) rats. The animals were divided into four groups (n = 5 or 6). The first and second groups received normal saline (control) and intraperitoneal (i.p.) N-acetylcysteine (500 mg kg(-1) per day for 9 days), respectively. The third and fourth groups were given a single intraperitoneal (i.p.) injection of CP (5 mg kg(-1)) and an i.p. injection of CP (5 mg kg(-1)) together with i.p. NAC (500 mg kg(-1) per day for 9 days), respectively. At the end of the experiment, rats were anesthetized and blood pressure and renal blood flow were monitored, followed by intravenous (i.v.) injection of norepinephrine (NE) for measurement of renal vasoconstrictor responses. CP caused a significant reduction in renal blood flow but did not affect NE-induced renal vasoconstriction. In addition, CP significantly increased plasma concentrations of urea and creatinine and urinary N-acetyl-beta-D-glucosaminidase (NAG) activity and kidney relative weight. CP decreased body weight and creatinine clearance. Histopathologically, CP caused remarkable renal damage compared with control. NAC alone did not produce any significant change in any of the variables measured. However, NAC significantly ameliorated CP-induced hemodynamic, biochemical and histopathological changes. The concentration of platinum in the kidneys of CP ? NAC treated rats was less than in CP-treated rats by 37%. The results show that administration of i.p. NAC (500 mg kg(-1) per day for 9 days) reversed the renal hemodynamic changes as well as the biochemical and histopathological indices of CP-induced nephrotoxicity in WKY rats.
Collapse
Affiliation(s)
- Aly M Abdelrahman
- Department of Pharmacology and Clinical Pharmacy, College of Medicine and Health Sciences, Sultan Qaboos University, Al-Khod, Muscat 123, Sultanate of Oman.
| | | | | | | | | | | |
Collapse
|
17
|
Salman IM, Sattar MA, Abdullah NA, Ameer OZ, Yam MF, Kaur G, Khan MAH, Johns EJ. Renal Ischemic Injury Affects Renal Hemodynamics and Excretory Functions in Sprague Dawley Rats: Involvement of Renal Sympathetic Tone. Ren Fail 2010; 32:96-102. [DOI: 10.3109/08860220903389196] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ibrahim M. Salman
- Department of Cardiovascular and Renal Physiology and Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Munavvar A. Sattar
- Department of Pharmacology, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Nor A. Abdullah
- Department of Cardiovascular and Renal Physiology and Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Omar Z. Ameer
- Department of Integrative Medicine, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Kepala Batas, Penang, Malaysia,
| | - Mun F. Yam
- Tulane Hypertension and Renal Center of Excellence, Tulane University Health Science Center, New Orleans, Louisiana, USA
| | - Gurjeet Kaur
- Department of Physiology, Aras Windle, University College Cork, College Road, Cork, Ireland
| | - Md. Abdul Hye Khan
- Department of Cardiovascular and Renal Physiology and Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Edward J. Johns
- Department of Pharmacology, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| |
Collapse
|
18
|
Kazi RN, Munavvar AS, Abdullah NA, Khan AH, Johns EJ. Influence of high dietary sodium intake on the functional subtypes of alpha-adrenoceptors in the renal cortical vasculature of Wistar-Kyoto rats. ACTA ACUST UNITED AC 2009; 29:25-31. [PMID: 19302553 DOI: 10.1111/j.1474-8673.2009.00428.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1 Increased renal vascular resistance is one renal functional abnormality that contributes to hypertension, and alpha(1)-adrenoceptors play a pivotal role in modulating this renal vascular resistance. This study investigates the functional contribution of alpha(1)-adrenoceptor subtypes in the renal cortical vasculature of Wistar-Kyoto rats on a normal sodium diet (WKYNNa) compared with those given saline to drink for 6 weeks (WKYHNa). 2 The renal cortical vascular responses to the adrenergic agonists noradrenaline (NA), methoxamine (ME) and phenylephrine (PE) were measured in WKYHNa and WKYNNa rats either in the absence (the control phase) or presence of chloroethylclonidine (CEC), an alpha(1B)-adrenoceptor antagonist, 5-methylurapidil (5-MeU), an alpha(1A) antagonist, or BMY7378, an alpha(1D) antagonist. 3 Results showed a greater renal cortical vascular sensitivity to NA, PE and ME in the WKYHNa compared with WKYNNa rats (P < 0.05). Moreover, 5-MeU and BMY7378 attenuated adrenergically induced renal cortical vasoconstriction in WKYHNa and WKYNNa rats; this response was largely blunted in CEC-treated WKYHNa rats (all P < 0.05) but not in CEC-treated WKYNNa rats. 4 The data suggest that irrespective of dietary sodium content, in Wistar-Kyoto rats alpha(1A)- and alpha(1D)-subtypes are the major alpha(1)-adrenoceptors in renal cortical vasculature; however, there appears to be a functional involvement of alpha(1B)-adrenoceptors in the WKYHNa rats.
Collapse
Affiliation(s)
- R N Kazi
- University Sains Malaysia, Penang, Malaysia
| | | | | | | | | |
Collapse
|
19
|
Khan AH, Sattar MA, Abdullah NA, Johns EJ. EFFECT OF CALCIUM CHANNEL BLOCKADE ON ADRENERGICALLY INDUCED RENAL VASOCONSTRICTION IN RAT MODELS OF RENAL IMPAIRMENT. Clin Exp Pharmacol Physiol 2009; 36:501-8. [DOI: 10.1111/j.1440-1681.2008.05098.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
20
|
Chronic treatment with losartan and carvedilol differentially modulates renal vascular responses to sympathomimetics compared to treatment with individual agents in normal Wistar Kyoto and spontaneously hypertensive rats. Eur J Pharmacol 2009; 612:69-74. [PMID: 19356722 DOI: 10.1016/j.ejphar.2009.03.064] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 03/09/2009] [Accepted: 03/23/2009] [Indexed: 12/20/2022]
Abstract
This study set out to investigate the impact of chronic cumulative blockade of angiotensin II and adrenoceptors in WKY and SHR and to explore how the renovascular responses to adrenergic and angiotensin II receptor agonists may be interdependent. Rats were treated with either losartan, carvedilol or losartan+carvedilol for 7 days and on day eight, animals were pentobarbitone anaesthetized and prepared for renal haemodynamic study. Dose-response relationships were determined in terms of reduction/elevation in the magnitude of renal blood flow in response to intrarenal arterial injection of dopamine, phenylephrine and isoprenaline. Renal vascular responses were blunted in WKY and SHR treated with either losartan or carvedilol as compared to their untreated counterparts (P<0.05). In the combined treated rats, the vascular responses to isoprenaline and phenylephrine were restored to levels observed in the untreated rats, but the renal vasoconstrictor responses to dopamine decreased (P<0.05) in both WKY and SHR. There was a reduction of (P<0.05) in the magnitude of the isoprenaline induced renal vasodilation in all SHR as compared to WKY groups. The data obtained showed that the renal vascular action of dopamine, phenylephrine and isoprenaline depended on an intact renin-angiotensin system (RAS) in WKY and SHR. Treatment with losartan or carvedilol blunted the renal vasoconstrictor/vasodilator responses to sympathomimetics which was attenuated with the combined treatment. These observations using chronic blockade of adrenergic and angiotensin receptors demonstrated that there was a long standing interdependency between the RAS and sympathetic nervous system (SNS) in determining the responsiveness of the renal vasculature of normal and hypertensive rats.
Collapse
|
21
|
Abdulla MH, Sattar MA, Khan MAH, Abdullah NA, Johns EJ. Influence of sympathetic and AT-receptor blockade on angiotensin II and adrenergic agonist-induced renal vasoconstrictions in spontaneously hypertensive rats. Acta Physiol (Oxf) 2009; 195:397-404. [PMID: 19183357 DOI: 10.1111/j.1748-1716.2008.01895.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIM This study investigated the influence of angiotensin II (Ang II) receptor and adrenergic blockade on the renal vasoconstrictions caused by Ang II and adrenergic agonists in spontaneously hypertensive rats (SHR). METHODS Forty-eight SHR were subjected to 7 days of losartan (10 mg kg(-1) day(-1) p.o.), carvedilol (5 mg kg(-1) day(-1) p.o.) or losartan + carvedilol (10 mg kg(-1) day(-1) + 5 mg kg(-1) day(-1) p.o.). On day 8, the rats were anaesthetized and renal vasoconstrictor experiments performed. One group of rats underwent acute unilateral renal denervation. RESULTS There were significant (P < 0.05) reductions in the renal vasoconstrictor responses to noradrenaline, phenylephrine, methoxamine and Ang II after losartan and carvedilol treatments compared with that in untreated rats (all P < 0.05). However, in renally denervated SHR treated with carvedilol, the vasoconstrictor responses to all the vasoactive agents were enhanced compared with those in SHR with intact renal nerves treated with carvedilol. Intact SHR given both losartan and carvedilol showed greater renal vasoconstrictor responses to the vasoactive agents than when given either losartan or carvedilol alone (all P < 0.05). CONCLUSION Carvedilol reduced the vasoconstrictor response to Ang II and all the adrenergic agonists in the presence of the renal nerves, but, following the removal of renal sympathetic activity, carvedilol enhanced the sensitivity of both renal alpha(1)-adrenoceptors and AT(1) receptors to the vasoactive agents. Co-treatment with losartan and carvedilol reduced the renal vasoconstrictor responses to exogenously administered vasoactive agents but to a lesser extent than losartan or carvedilol alone. The results obtained demonstrate an interaction between Ang II receptors and adrenergic neurotransmission in the SHR.
Collapse
Affiliation(s)
- M H Abdulla
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia.
| | | | | | | | | |
Collapse
|
22
|
Salman I, Sattar M, Abdullah N, Ameer O, Abdulla M, Khan M, Johns E. Quantification of Acute Renal Denervation Diuresis and Natriuresis
in Sprague Dawley and Spontaneously Hypertensive Rats. INT J PHARMACOL 2008. [DOI: 10.3923/ijp.2009.30.36] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
23
|
Abdulla MH, Sattar MA, Abdullah NA, Hazim AI, Anand Swarup KRL, Rathore HA, Khan MAH, Johns EJ. Inhibition of Ang II and renal sympathetic nerve influence dopamine-and isoprenaline-induced renal haemodynamic changes in normal Wistar-Kyoto and spontaneously hypertensive rats. ACTA ACUST UNITED AC 2008; 28:95-101. [DOI: 10.1111/j.1474-8673.2008.00422.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
24
|
Armenia A, Sattar MA, Abdullah NA, Khan MAH, Johns EJ. Functional subtypes of renal alpha1-adrenoceptor in diabetic and non-diabetic 2K1C Goldblatt renovascular hypertension. Acta Pharmacol Sin 2008; 29:564-72. [PMID: 18430364 DOI: 10.1111/j.1745-7254.2008.00788.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
AIM This study investigates the subtypes of the alpha1-adrenoceptor mediating the adrenergically-induced renal vasoconstrictor responses in streptozotocin-induced diabetic and non-diabetic 2-kidney one clip (2K1C) Goldblatt hypertensive rats. METHODS The renal blood flow responses to renal nerve stimulation, noradrenaline, phenylephrine, and methoxamine were measured in the absence and presence of nitrendipine, 5-methylurapidil, chloroethylclonidine and BMY 7378. RESULTS The renal vasoconstrictor responses were markedly attenuated by nitrendipine and 5- methylurapidil in the diabetic rats (all P< 0.05). In the non-diabetic rats, these responses were markedly attenuated by nitrendipine, 5-methylurapidil, and BMY 7378 (all P< 0.05). In both experimental groups, chloroethylclonidine markedly accentuated the renal vasoconstrictions caused by all the adrenergic stimuli (all P< 0.05). CONCLUSION These observations indicate that alpha 1A-adrenoceptor subtypes play a major role in mediating adrenergically-induced renal vasoconstriction in the diabetic 2K1C Goldblatt hypertensive rats. In the non-diabetic 2K1C Goldblatt hypertensive rats, contributions of alpha 1A and alpha 1D-adrenoceptor subtypes were proposed. Apart from post-synaptic alpha 1-adrenoceptors, both in the diabetic and non-diabetic 2K1C Goldblatt hypertensive rats, the potential involvement of presynaptic alpha 1- adrenoceptors is also suggested.
Collapse
Affiliation(s)
- A Armenia
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
| | | | | | | | | |
Collapse
|
25
|
Abdulla MH, Sattar MA, Salman IM, Abdullah NA, Ameer OZ, Khan MAH, Johns EJ. Effect of acute unilateral renal denervation on renal hemodynamics in spontaneously hypertensive rats. ACTA ACUST UNITED AC 2008; 28:87-94. [DOI: 10.1111/j.1474-8673.2008.00421.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
26
|
Hiong LC, Voon KL, Abdullah NA, Sattar MA, Rahman NA, Khan AH, Johns EJ. Effect of TGF-beta1 antisense oligodeoxynucleotide on renal function in chronic renal failure rats. Acta Pharmacol Sin 2008; 29:451-7. [PMID: 18358091 DOI: 10.1111/j.1745-7254.2008.00772.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
AIM The aim of the present study was to investigate the effectiveness of transforming growth factor (TGF)-beta1 antisense oligodeoxynucleotides (ODN) in ameliorating deteriorated kidney function in rats with puromycin-induced chronic renal failure (CRF). METHODS Saline, puromycin, puromycin+TGF-beta1 antisense ODN or puromycin+scrambled ODN were administered to unilaterally nephrectomized rats. Renal hemodynamic and excretory measurements were taken in the anaesthetized rats that had undergone surgical procedure. RESULTS It was observed that in the CRF rats, there was a marked reduction in the renal blood flow (RBF), glomerular filtration rate (GFR), severe proteinuria, and almost 6-fold increased fractional excretion of sodium (FE Na+) as compared to that in the control rats (all P<0.05). It was further observed that in the CRF rats, the treatment with TGF-beta1 antisense, but not scrambled ODN, markedly attenuated the reduction of RBF, GFR, and proteinuria and markedly prevented the increase of the FE Na+ (all P<0.05). In addition, the renal hypertrophy in the CRF group (P<0.05 vs non-renal failure control) was markedly attenuated after treatment with TGF-1 antisense ODN (P<0.05). Focal segmental glomerulosclerosis was evident only in the untreated and scrambled ODN-treated CRF groups. An interesting observation of this study was that in the CRF rats, although there was marked attenuating and preventive effects of the TGF-beta1 antisense ODN on the deteriorated renal functions, the antisense treatment did not cause any marked change in the renal expression of TGF-beta1 at the protein level. CONCLUSION Collectively, the data obtained suggests that TGF-beta1 antisense ODN possesses beneficial effects in puromycininduced chronic renal failure and that the deterioration in morphology and impaired renal function in this pathological state is in part dependent upon the action of TGF-beta1 within the kidney.
Collapse
Affiliation(s)
- Law Chung Hiong
- Department of Pharmacology, University of Malaya, Kuala Lumpur 50603, Malaysia
| | | | | | | | | | | | | |
Collapse
|
27
|
Influence of combined hypertension and renal failure on functional alpha(1)-adrenoceptor subtypes in the rat kidney. Br J Pharmacol 2008; 153:1232-41. [PMID: 18246093 DOI: 10.1038/bjp.2008.13] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND AND PURPOSE This study investigated whether the alpha(1)-adrenoceptor responsiveness of the renal vasculature was altered in the state of hypertension combined with renal failure. EXPERIMENTAL APPROACH Male spontaneously hypertensive rats (SHR) received cisplatin (5 mg kg(-1) i.p.) to induce renal failure. Seven days later, the rats were anaesthetized and the reductions in renal blood flow (RBF) to electrical renal nerve stimulation (RNS) and intrarenal administration of three adrenoceptor agonists (noradrenaline, phenylephrine and methoxamine) were determined before and after amlodipine, 5-methylurapidil, chloroethylclonidine or BMY 7378. KEY RESULTS In renal failure SHR (RFSHR), RBF and creatinine clearance were significantly reduced (approximately 70%), while urine output and fractional sodium excretion were four and twenty-fold higher, respectively, compared to SHR. Vasoconstrictions induced by RNS or the adrenoceptor agonists were greater in RFSHR than SHR, and these responses were blunted by 5-methylurapidil, BMY 7378 and amlodipine in the SHR, while chloroethylclonidine had no effect. In the RFSHR, all renal vasoconstrictions were reduced by amlodipine and BMY 7378 but 5-methylurapidil attenuated those caused by RNS, noradrenaline and methoxamine while those to phenylephrine were enhanced. Chloroethylclonidine potentiated renal vasoconstrictor responses to methoxamine and phenylephrine but not RNS or noradrenaline in RFSHR. CONCLUSIONS AND IMPLICATIONS These findings suggest alpha(1A)- and alpha(1D)-adrenoceptors mediated the renal vasoconstrictor responses in SHR and RFSHR. In the RFSHR, other alpha(1)-adrenoceptor subtypes, for example, alpha(1B)-adrenoceptors appeared to play a greater role.
Collapse
|
28
|
Khan MAH, Sattar MA, Abdullah NA, Johns EJ. Alpha1B-adrenoceptors mediate adrenergically-induced renal vasoconstrictions in rats with renal impairment. Acta Pharmacol Sin 2008; 29:193-203. [PMID: 18215348 DOI: 10.1111/j.1745-7254.2008.00727.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
AIM This study examined whether alpha1B-adrenoceptors are involved in mediating adrenergically-induced renal vasoconstrictor responses in rats with pathophysiological and normal physiological states. METHODS Male Wistar Kyoto and spontaneously hypertensive rats were induced with acute renal failure or experimental early diabetic nephropathy by cisplatin or streptozotocin, respectively. Cisplatin-induced renal failure was confirmed by impaired renal function and pronounced tubular damage. Experimental early diabetic nephropathy was confirmed by hyperglycemia, changes in physiological parameters, and renal function. The hemodynamic study was conducted on anesthetized rats after 7 d of cisplatin (renal failure) and 4 weeks of streptozotocin (experimental early diabetic nephropathy). RESULTS In the rats with renal failure and experimental early diabetic nephropathy, there were marked reductions in their baseline renal blood flow (P<0.01). The baseline mean arterial blood pressure was either unaltered or lower (all P>0.05) in the renal failure and experimental early diabetic nephropathy rats, respectively, as compared to their non-renal failure and non-diabetic nephropathy controls. In the rats with renal impairment, chloroethylclonidine caused either accentuation or attenuation (all P<0.01) of the renal vasoconstrictor responses elicited by the adrenergic stimuli. However, in the non-renal failure and in the non-diabetic nephropathy rats, chloroethylclonidine did not cause any alteration in such responses (P>0.05). CONCLUSION This study demonstrated the presence of functional alpha1B-adrenoceptors that mediated the adrenergically-induced renal vasoconstrictions in rats with renal impairment, but not in rats with normal renal function.
Collapse
Affiliation(s)
- Md Abdul Hye Khan
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
| | | | | | | |
Collapse
|
29
|
Sattar MA, Abdullah NA, Khan MAH, Johns EJ. α1A- and α1D-adrenoceptors are the major functional subtypes of renal α1-adrenoceptors in streptozotocin-induced diabetic and normal Sprague–Dawley rats. ACTA ACUST UNITED AC 2008; 28:1-10. [DOI: 10.1111/j.1474-8673.2007.00412.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|