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Imam F, Rehman NU, Ansari MN, Qamar W, Afzal M, Alharbi KS. Effect of Roflumilast in airways disorders via dual inhibition of phosphodiesterase and Ca 2+-channel. Saudi Pharm J 2020; 28:698-702. [PMID: 32550801 PMCID: PMC7292871 DOI: 10.1016/j.jsps.2020.04.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/18/2020] [Indexed: 11/30/2022] Open
Abstract
The bronchodilator effects of Roflumilast “a selective phosphodiesterase type-4 (PDE4)” inhibitor studied in this experimental protocol. The spiral strips of isolated guinea-pig tracheal chains mounted in organ bath and maintained in Krebs solution ventilated with carbogen at 32 °C and in Ca++ restricted krebs solution. PDE inhibitory activity was evaluated by recording dose response curves using inhibitory effect of isoprenaline on CCh induced contractions. For confirmation of PDE inhibition the intracellular cAMP levels were also estimated. Roflumilast resulted a sharp inhibition in contractile responses of carbachol (CCh, 1 µM) and K+ (80 mM) and the results were almost similar to verapamil. In Ca++ restricted Krebs solution, a rightward shift in the Ca++ response curves observed in the tracheal chain strips which were pretreated with Roflumilast (0.001–0.003 mg/mL) and the maximum response was suppressed, similarly as with verapamil. PDE inhibitory effect of Roflumilast evaluated by recording dose-dependent (0.03–0.1 mg/mL) responses, the isoprenaline-induced inhibitory dose response curves shifted leftward similar to papaverine (PDE inhibitor). Pretreatment with Roflumilast exhibited elevated intracellular cAMP levels in tracheal strips. Findings of the experiment conclude bronchodilatory influence of Roflumilast via PDE and Ca++ channel inhibition. Results of current experiment offers comprehensive mechanistic background of Roflumilast in future as therapeutic bronchodilator for hyperactive bronchial airway diseases.
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Affiliation(s)
- Faisal Imam
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
- Corresponding authors at: Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box: 2457, Riyadh 11451, Saudi Arabia (F. Imam). Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia. (M.N. Ansari).
| | - Najeeb Ur Rehman
- Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Mohd Nazam Ansari
- Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
- Corresponding authors at: Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box: 2457, Riyadh 11451, Saudi Arabia (F. Imam). Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia. (M.N. Ansari).
| | - Wajhul Qamar
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
- Central Laboratory; Research Center, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Muhammad Afzal
- Department of Pharmacology, College of Pharmacy, Jouf University, Sakakah 72341, Saudi Arabia
| | - Khalid Saad Alharbi
- Department of Pharmacology, College of Pharmacy, Jouf University, Sakakah 72341, Saudi Arabia
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Rehman NU, Ansari MN, Samad A. In Silico, Ex Vivo and In Vivo Studies of Roflumilast as a Potential Antidiarrheal and Antispasmodic agent: Inhibition of the PDE-4 Enzyme and Voltage-gated Ca++ ion Channels. Molecules 2020; 25:molecules25041008. [PMID: 32102361 PMCID: PMC7070291 DOI: 10.3390/molecules25041008] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/21/2020] [Accepted: 02/24/2020] [Indexed: 12/17/2022] Open
Abstract
The aim of the present study was to evaluate the possible gut inhibitory role of the phosphodiesterase (PDE) inhibitor roflumilast. Increasing doses of roflumilast were tested against castor oil-induced diarrhea in mice, whereas the pharmacodynamics of the same effect was determined in isolated rabbit jejunum tissues. For in silico analysis, the identified PDE protein was docked with roflumilast and papaverine using the Autodock vina program from the PyRx virtual screening tool. Roflumilast protected against diarrhea significantly at 0.5 and 1.5 mg/kg doses, with 40% and 80% protection. Ex vivo findings from jejunum tissues show that roflumilast possesses an antispasmodic effect by inhibiting spontaneous contractions in a concentration-dependent manner. Roflumilast reversed carbachol (CCh, 1 µM)-mediated and potassium (K+, 80 mM)-mediated contractile responses with comparable efficacies but different potencies. The observed potency against K+ was significantly higher in comparison to CCh, similar to verapamil. Experiments were extended to further confirm the inhibitory effect on Ca++ channels. Interestingly, roflumilast deflected Ca++ concentration–response curves (CRCs) to the right with suppression of the maximum peak at both tested doses (0.001-0.003 mg/mL), similar to verapamil. The PDE-inhibitory effect was authenticated when pre-incubation of jejunum tissues with roflumilast (0.03-0.1 mg/mL) produced a leftward deflection of isoprenaline-mediated inhibitory CRCs and increased the tissue level of cAMP, similar to papaverine. This idea was further strengthened by molecular docking studies, where roflumilast exhibited a better binding affinity (-9.4 kcal/mol) with the PDE protein than the standard papaverine (-8.3 kcal/mol). In conclusion, inhibition of Ca++ channels and the PDE-4 enzyme explains the pharmacodynamics of the gut inhibitory effect of roflumilast.
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Affiliation(s)
- Najeeb Ur Rehman
- Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
- Correspondence: (N.U.R.); (M.N.A.); Tel.: +966 11 5886035 (N.U.R.); +966 11 5886037 (M.N.A.)
| | - Mohd Nazam Ansari
- Department of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
- Correspondence: (N.U.R.); (M.N.A.); Tel.: +966 11 5886035 (N.U.R.); +966 11 5886037 (M.N.A.)
| | - Abdul Samad
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Tishk International University, Erbil 44001, Kurdistan, Iraq;
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Ansari MN, Ganaie MA, Rehman NU, Alharthy KM, Khan TH, Imam F, Ansari MA, Al-Harbi NO, Jan BL, Sheikh IA, Hamad AM. Protective role of Roflumilast against cadmium-induced cardiotoxicity through inhibition of oxidative stress and NF-κB signaling in rats. Saudi Pharm J 2019; 27:673-681. [PMID: 31297022 PMCID: PMC6598217 DOI: 10.1016/j.jsps.2019.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/01/2019] [Indexed: 12/23/2022] Open
Abstract
Cadmium (Cd), a potent cardiotoxic environmental heavy metal, induces oxidative stress and membrane disturbances in cardiac myocytes. Phosphodiesterase (PDEs) retards the positive inotropic effects of β-adrenoceptor activation by decreasing levels of cAMP via degradation. Hence, PDE inhibitors sensitize the heart to catecholamine and are therefore, used as positive inotropic agents. The present study was designed to probe the potential attenuating effects of the selective PDE4 inhibitor (Roflumilast, ROF), on cardiac biomarkers, lipid profile, lipid peroxidation products, antioxidant status and histology of cardiac tissues against Cd-induced cardiotoxicity in rats. Rats were randomly distributed into four different groups: group 1, served as the normal control group. Group 2, served as the toxic control group and were administered Cd (3 mg/kg, i.p.) for next 7 days. Groups 3 and 4, served as treatment groups that received Cd with concomitant oral administration of ROF doses (0.5 and 1.5 mg/kg), respectively for 7 days. Serum samples of toxic control group rats resulted in significant (P < 0.001) increase in lactate dehydrogenase (LDH), creatine phosphokinase (CPK), total cholesterol (TC), triglycerides (TG) and low density lipoproteins (LDL) levels with concomitant decrease in high density lipoproteins (HDL) levels in serum which were found reversed with both of ROF treatment groups. Cd also causes significant increased (P < 0.001) in myocardial malondialdehyde (MDA) contents while cardiac glutathione (GSH) level, superoxide dismutase (SOD) and catalase (CAT) enzyme activities were found decreased whereas both doses of ROF, significantly reversed these oxidative stress markers and antioxidant enzymes. Cardiotoxicity induced by Cd also resulted in enhanced expression of non-phosphorylated and phosphorylated form of NF-κB p65 and decreased expression of glutathione-S-transferase (GST) and NQO1 which were found reversed with ROF treatments, comparable to normal control group. Histopathological changes were also improved by ROF administration as compared to Cd treated rats alone. In conclusion, Roflumilast exhibited attenuating effect against Cd-induced cardiac toxicity.
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Affiliation(s)
- Mohd Nazam Ansari
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Majid A. Ganaie
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Najeeb Ur Rehman
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Khalid M. Alharthy
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Tajdar H. Khan
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Faisal Imam
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mushtaq A. Ansari
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Naif O. Al-Harbi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Basit L. Jan
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Ishfaq A. Sheikh
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Abubaker M. Hamad
- Department of Basic Sciences, Preparatory Year Deanship, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
- Department of Histopathology and Cytopathology, Faculty of Medical Laboratory Sciences, University of Gezira, Wad Madani, Sudan
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Imam F, Al-Harbi NO, Al-Harbi MM, Ansari MA, Al-Asmari AF, Ansari MN, Al-Anazi WA, Bahashwan S, Almutairi MM, Alshammari M, Khan MR, Alsaad AM, Alotaibi MR. Apremilast prevent doxorubicin-induced apoptosis and inflammation in heart through inhibition of oxidative stress mediated activation of NF-κB signaling pathways. Pharmacol Rep 2018; 70:993-1000. [DOI: 10.1016/j.pharep.2018.03.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 01/01/2018] [Accepted: 03/27/2018] [Indexed: 12/25/2022]
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Kumar A, VK G, AK V, Mandil R, Rahal A, SK Y. Lipid Peroxidation and Antioxidant System in Erythrocytes of Brucella Vaccinated and Challenged Goats. ACTA ACUST UNITED AC 2017. [DOI: 10.15406/ijvv.2017.04.00092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Influence of dexamethasone-induced stress on oxidative stress biomarkers in non-pregnant does experimentally infected with Brucella melitensis. ACTA ACUST UNITED AC 2017. [DOI: 10.1007/s00580-016-2395-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Imam F, Al-Harbi NO, Al-Harbi MM, Ansari MA, Almutairi MM, Alshammari M, Almukhlafi TS, Ansari MN, Aljerian K, Ahmad SF. Apremilast reversed carfilzomib-induced cardiotoxicity through inhibition of oxidative stress, NF-κB and MAPK signaling in rats. Toxicol Mech Methods 2016; 26:700-708. [PMID: 27785949 DOI: 10.1080/15376516.2016.1236425] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Carfilzomib (CFZ), is a potent, selective second generation proteasome inhibitor, used for the treatment of multiple myeloma. The aim of the present study was to investigate the possible protective effect of apremilast (AP) on the CFZ -induced cardiotoxicity. Rats were randomly divided into four groups: Group 1, served as the control group, received normal saline. Group 2, served as the toxic group, received CFZ (4 mg/kg, intraperitoneally [i.p.]). Groups 3 and 4, served as treatment groups, and received CFZ with concomitant oral administration of AP in doses of 10 and 20 mg/kg/day, respectively. In the present study, administration of CFZ resulted in a significant increase in serum aspartate transaminase (AST), lactate dehydrogenase (LDH), creatine kinase (CK) and creatine kinase-MB (CK-MB), which were reversed by treatment with AP. CFZ resulted in a significant increase in heart malondialdehyde (MDA) contents and decrease in cardiac glutathione (GSH) level and catalase (CAT) enzyme activity which were significantly reversed by treatment with AP. Induction of cardiotoxicity by CFZ significantly increased caspase-3 enzyme activity which were reversed by treatment with AP. RT-PCR analysis revealed an increased mRNA expression of NF-κB, ERK and JNK which were reversed by treatment with AP in cardiac tissues. Western blot analysis revealed an increased expression of caspase-3 and NF-κB p65 and a decrease expression of inhibitory kappa B-alpha (Iκbα) with CFZ, which were reversed by treatment with AP. In conclusion, apremilast showed protective effect against CFZ-induced cardiotoxicity.
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Affiliation(s)
- Faisal Imam
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Naif O Al-Harbi
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Mohammad Matar Al-Harbi
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Mushtaq Ahmad Ansari
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Mashal M Almutairi
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Musaad Alshammari
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
| | - Talal Saad Almukhlafi
- b Department of Pharmacology, College of Pharmacy , Prince Sattam Bin Abdulaziz University , Al-Kharj , Saudi Arabia
| | - Mohd Nazam Ansari
- b Department of Pharmacology, College of Pharmacy , Prince Sattam Bin Abdulaziz University , Al-Kharj , Saudi Arabia
| | - Khaldoon Aljerian
- c King Khalid University Hospital, College of Medicine , King Saud University, Forensic Medicine and Toxicology Unit , Riyadh , Saudi Arabia
| | - Sheikh Fayaz Ahmad
- a Department of Pharmacology and Toxicology, College of Pharmacy , King Saud University , Riyadh , Saudi Arabia
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Liu WJ, Dong H, Peng XW, Wu QM. The Cyclic AMP-binding protein CbpB in Brucella melitensis and its role in cell envelope integrity, resistance to detergent and virulence. FEMS Microbiol Lett 2014; 356:79-88. [PMID: 24850100 DOI: 10.1111/1574-6968.12472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/14/2014] [Accepted: 05/15/2014] [Indexed: 11/30/2022] Open
Abstract
Brucella melitensis possesses an operon with two components: the response regulator OtpR and a putative cAMP-dependent protein kinase regulatory subunit encoded by the BMEI0067 gene. In the previous study, the function of OtpR has been studied, while little is known about the function of the BMEI0067 gene. Using a bioinformatics approach, we showed that the BMEI0067 gene encodes an additional putative cAMP-binding protein, which we refer to as CbpB. Structural modeling predicted that CbpB has a cAMP-binding protein (CAP) domain and is structurally similar to eukaryotic protein kinase A regulatory subunits. Here, we report the characterization of CbpB, a cAMP-binding protein in Brucella melitensis, showed to be involved in mouse persistent infections. ∆cbpB::km possessed cell elongation, bubble-like protrusions on cell surface and its resistance to environmental stresses (temperature, osmotic stress and detergent). Interestingly, comparative real-time qPCR assays, the cbpB mutation resulted in significantly different expression of aqpX and several penicillin-binding proteins and cell division proteins in Brucella. Combined, these results demonstrated characterization of CbpB in B. melitensis and its key role for intracellular multiplication.
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Affiliation(s)
- Wen-Juan Liu
- Key Laboratory of Animal Epidemiology and Zoonosis of Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, China
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Erdogan S, Duzguner V, Kucukgul A, Aslantas O. Silencing of PrP C (prion protein) expression does not affect Brucella melitensis infection in human derived microglia cells. Res Vet Sci 2013; 95:368-73. [PMID: 23820446 DOI: 10.1016/j.rvsc.2013.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 06/05/2013] [Accepted: 06/06/2013] [Indexed: 01/18/2023]
Abstract
Cellular prion proteins (PrP(C)) are mainly expressed in the central nervous system where they have antioxidant effects and a role in the endocytosis of bacteria within cells. These proteins also have some crucial biological functions including roles in neurotransmission, signal transduction and programmed cell death. However, the role of prion proteins in neuronal Brucella infection, specifically in the interaction of the pathogen and the host cell is controversial. In the present study, the silencing of PrP(C) mRNA by small interfering RNA (siRNA) transfection was investigated in human microglia cells infected with Brucella melitensis. More than 70% of prion proteins were down-regulated in microglia by siRNA transfection and this caused a slight decrease in the cellular viability of the control cells. Silencing of PrP(C) suppressed the antioxidant systems, though it led to an up-regulation of pro-inflammatory cytokines such as IL-12 and TNF-α as demonstrated by qRT-PCR analysis. B. melitensis infection of prion protein-silenced cells led to increase host viability, but had no effect on bacterial phagocytosis. According to the present study, there is no significant effect of prion proteins on phagocytosis and intracellular killing of B. melitensis in microglia cells.
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Affiliation(s)
- Suat Erdogan
- Zirve University, Emine-Bahaeddin Nakiboglu Medical School, Department of Medical Biochemistry, Gaziantep, Turkey.
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Vadla GPA, Vellaichamy E. Beneficial effects of aminoguanidine against streptozotocin-induced pathological changes in diabetic mice kidney. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.bionut.2012.10.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Mammadov E, Aridogan IA, Izol V, Acikalin A, Abat D, Tuli A, Bayazit Y. Protective effects of phosphodiesterase-4-specific inhibitor rolipram on acute ischemia-reperfusion injury in rat kidney. Urology 2012; 80:1390.e1-6. [PMID: 23010343 DOI: 10.1016/j.urology.2012.07.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Revised: 06/20/2012] [Accepted: 07/21/2012] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To investigate the effect of Rolipram, a phosphodiesterase-4-inhibitor, on renal ischemia-reperfusion injury (IRI) in rats. METHODS Thirty rats were divided into 5 different groups of 6 rats. Nothing was done to the control group. In the second group, the renal pedicle was clamped for 30 minutes. In the third group, 1 mg/kg of Rolipram was given by intraperitoneal injection 30 minutes before clamping. The fourth group received the same injection when the clamp was placed, as did the fifth group 30 minutes after the clamp was opened. Clamping time was set at 30 minutes. Twenty-four hours later, nephrectomy was performed in all the groups. Half of each kidney was examined histopathologically. Levels of biochemical agents, such as malondialdehyde, superoxide dismutase, and catalase, were measured in the other half. RESULTS The malondialdehyde (MDA) levels significantly decreased and reached control levels in the group in which Rolipram was administered 30 minutes after reperfusion (P = .07). The catalase and superoxide dismutase activities obtained from renal homogentisates of the ischemia groups were evaluated; there were striking increases in tissue levels of these 2 enzymes in the groups in which Rolipram was administered during ischemia and 30 minutes after ischemia (P < .001). Histopathologically, there was no significant difference in inflammation between the Rolipram-administrated groups compared with group 1 (control) and group 2 (IRI). Tubular necrosis and apoptosis was significantly lower in group 5 than the other groups, except group 1 (P < .001). CONCLUSION We suggest that in surgical procedures that can lead to renal IRI, the administration of Rolipram can decrease oxidative renal tissue damage and the severe deterioration of renal function.
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Affiliation(s)
- Emin Mammadov
- Department of Urology, Faculty of Medicine, University of Çukurova, Adana, Turkey
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Ghiasi S, Ghiasi S, Abdollahi M. A Review on the Potential Benefits of Phosphodiesterase Inhibitors in Various Models of Toxicities in Animals. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/ajava.2012.210.224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Görür S, Çelik S, Hakverdi S, Aslantaş Ö, Erdoğan S, Aydın M, Ocak S, Namık Kiper A. Preventive Effect of Rolipram, a Phosphodiesterase 4 Enzyme Inhibitor, on Oxidative Renal Injury in Acute Ascending Pyelonephritis Model in Rats. Urology 2008; 72:743-8. [DOI: 10.1016/j.urology.2008.04.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 03/13/2008] [Accepted: 04/09/2008] [Indexed: 10/21/2022]
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14
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Erdogan S, Aslantas O, Celik S, Atik E. The effects of increased cAMP content on inflammation, oxidative stress and PDE4 transcripts during Brucella melitensis infection. Res Vet Sci 2007; 84:18-25. [PMID: 17397885 DOI: 10.1016/j.rvsc.2007.02.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 01/16/2007] [Accepted: 02/06/2007] [Indexed: 01/19/2023]
Abstract
Cyclic AMP (cAMP) is a key intracellular second messenger which at increased levels has been shown to have anti-inflammatory and tissue-protective effects. Its concentration is determined by the activities of both adenylate cyclase (AC) and the phosphodiesterase (PDE) enzymes. The aim of this study was to compare the effects of increased cAMP and glucocorticoid dexamethasone administration on B. melitensis-induced lipid peroxidation, Brucella suppressed antioxidant enzyme activities and PDE4 transcripts in rats. Intracellular cyclic AMP level was elevated by two different approaches; activation of AC and inhibition of PDE activities. Rats were inoculated with B. melitensis for seven days then a single dose of nonselective PDE inhibitor 3-isobutyl-1-methylxanthine (IBMX), the adenylate cyclase activator forskolin and dexamethasone were administrated to each infected group, and animals were challenged for 48 h. Brucella-induced lipid peroxidation was significantly reduced by the cAMP elevating agents as well as dexamethasone administration in plasma, liver and spleen. The antioxidant enzymes glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) activities were significantly decreased by the pathogen. Whilst suppressed GSH-Px activity was reversed by cAMP elevating agents, SOD activity was not restored. Superoxide generating enzyme xanthine oxidase activity was not altered at the end of the infection period. Brucella infection increased plasma IL-12 level and this effect was also suppressed by the cAMP elevating agents, whereas TNF-alpha, IFN-gamma and IL-10 levels were unchanged. Intracellular cAMP levels are entirely hydrolyzed by cAMP-specific PDE 4 isozymes (PDE4s) in inflammatory and immunocompetent cells. Brucella reduced mRNA transcript levels for PDE4A by 40%, though PDE4B and 4D transcriptions were being unaffected in spleen. It was concluded that B. melitensis infection decreased activity of the antioxidant defence system, induced lipid peroxidation and suppressed PDE4A transcription. Administration of cAMP elevating agents exhibited similar affect with dexamethasone on lipid peroxidation, IL-12 production and antioxidant enzyme activities in Brucella infection.
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Affiliation(s)
- Suat Erdogan
- Department of Biochemistry, Faculty of Veterinary Medicine, Mustafa Kemal University, Hatay 31034, Turkey.
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