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Faridan M, Khavanin A, Mirzaei R. Preconditioning by the inhalation of pure oxygen protects rat’s cochlear function against noise-induced hearing loss. ACTA ACUST UNITED AC 2017. [DOI: 10.29252/johe.6.4.215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Rasoulian B, Kaeidi A, Rezaei M, Hajializadeh Z. Cellular Preoxygenation Partially Attenuates the Antitumoral Effect of Cisplatin despite Highly Protective Effects on Renal Epithelial Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7203758. [PMID: 28298953 PMCID: PMC5337362 DOI: 10.1155/2017/7203758] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 01/15/2017] [Indexed: 01/26/2023]
Abstract
Our previous in vitro studies demonstrated that oxygen pretreatment significantly protects human embryonic renal tubular cell against acute cisplatin- (CP-) induced cytotoxicity. The present study was designed to investigate whether this protective effect is associated with decreasing therapeutic effects of cisplatin on malignant cells. For this purpose, cultured human embryonic kidney epithelial-like (AD293), cervical carcinoma epithelial-like (Hela), and ovarian adenocarcinoma epithelial-like (OVCAR-3) cells were subjected to either 2-hour pretreatment with oxygen (≥90%) or normal air and then to a previously determined 50% lethal dose of cisplatin for 24 hours. Cellular viability was evaluated via MTT and Neutral Red assays. Also, activated caspase-3 and Bax/Bcl-2 ratio, as the biochemical markers of cell apoptosis, were determined using immunoblotting. The hyperoxic preexposure protocol significantly protects renal AD293 cells against cisplatin-induced toxicity. Oxygen pretreatment also partially attenuated the cisplatin-induced cytotoxic effects on Hela and OVCAR-3 cells. However, it did not completely protect these cells against the therapeutic cytotoxic effects of cisplatin. In summary, the protective methods for reducing cisplatin nephrotoxic side effects like oxygen pretreatment might be associated with concurrent reduction of the therapeutic cytotoxic effects of cisplatin on malignant cells like cervical carcinoma (Hela) and ovarian adenocarcinoma (OVCAR-3) cells.
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Affiliation(s)
- Bahram Rasoulian
- Razi Herbal Medicines Research Center and Department of Physiology, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Ayat Kaeidi
- Department of Physiology and Pharmacology, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
- Physiology-Pharmacology Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Maryam Rezaei
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Zahra Hajializadeh
- Physiology-Pharmacology Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
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Wahhabaghai H, Heidari R, Zeinoddini A, Soleyman-Jahi S, Golmanesh L, Rasoulian B, Akbari H, Foadoddoni M, Esmailidehaj M. Hyperoxia-induced preconditioning against renal ischemic injury is mediated by reactive oxygen species but not related to heat shock proteins 70 and 32. Surgery 2015; 157:1014-22. [PMID: 25847506 DOI: 10.1016/j.surg.2015.01.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 01/21/2015] [Accepted: 01/29/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Pre-exposure of rats to normobaric hyperoxia (O2 ≥ 95%) may induce late preconditioning against renal ischemia-reperfusion (IR) injury. In this study we investigated probable mechanisms of IR injury such as the role of reactive oxygen species (ROS), renal antioxidant agents, and heat shock proteins (HSP) 32 and 70 during delayed hyperoxia-preconditioning (HO). METHODS Fifty-two rats were divided into 7 groups: (A) IR, (B) HO + IR, (C) mercaptopropionyl glycine (MPG) + HO + IR, (D) MPG + IR, (E) HO + sham, (F) MPG + sham, and (G) sham. Rats in the following study groups (group B, C and E) were kept in a normobaric hyperoxic environment for 4 h/day for 6 consecutive days, after which they were subjected to 40 minutes of ischemia; animals in the control group (group A, D, F, and G) were kept in a normoxic cage. At the end of the preconditioning period, 24 hours of reperfusion was performed. Renal function was assessed by measuring serum creatinine (Cr), blood urea nitrogen (BUN), and creatinine clearance (CLCr). Induction of the antioxidant system was evaluated by measuring renal catalase (CAT) and superoxide dismutase (SOD) activities and glutathione (GSH) and malondialdehyde (MDA) content. The role of ROS was investigated by use of MPG (a ROS scavenger). HSP32 & 70 mRNA and protein also were determined. RESULTS The hyperoxia-preconditioned IR group (B) had a lower plasma Cr and BUN and greater CLCr compared with the IR group (A) (P ≤ .016). Administration of MPG led to an increase in plasma Cr and BUN and a decrease in CLCr in group C compared with the hyperoxia-preconditioned group B (P ≤ .004). The hyperoxia-preconditioned IR group had a greater CAT activity and GSH level compared with the IR group A (P ≤ .007), whereas the administration of MPG did not change the GSH level but led to a decrease in CAT activity in group D compared with group B (P < .001). SOD activity did not change in hyperoxia-preconditioned ischemic rats compared with ischemic rats. Hyperoxia preconditioning and MPG administration in ischemic animals did not result in any considerable change in MDA level compared with the IR group A. Also, there were no clinically relevant differences in HSP32 & 70 mRNA and protein between all groups. CONCLUSION The present study demonstrates that repeated pre-exposure to hyperoxia can decrease subsequent renal IR damage in this rat model of renal ischemia. Free radical production after hyperoxia appears to play a pivotal role in the hyperoxia-induced renal protection independent of HSP level. Antioxidant enzyme activities and especially catalase seem to be implicated in this renal protective mechanism.
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Affiliation(s)
| | - Reza Heidari
- Urology Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Atefeh Zeinoddini
- Urology Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Saeed Soleyman-Jahi
- Urology Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Leila Golmanesh
- Department of Biochemistry, Tehran Azad University of Medical Sciences, Tehran, Iran
| | - Bahram Rasoulian
- Razi Herbal Medicines Research Center, Department of Physiology and Pharmacology, Lorestan University of Medical Sciences, Lorestan, Iran
| | - Hassan Akbari
- Department of Pathology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohsen Foadoddoni
- Department of Physiology and Pharmacology, Birjand University of Medical Sciences, Birjand, Iran
| | - Mansour Esmailidehaj
- Department of Physiology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Rasoulian B, Kaeidi A, Pourkhodadad S, Dezfoulian O, Rezaei M, Wahhabaghai H, Alirezaei M. Effects of pretreatment with single-dose or intermittent oxygen on Cisplatin-induced nephrotoxicity in rats. Nephrourol Mon 2014; 6:e19680. [PMID: 25695032 PMCID: PMC4318017 DOI: 10.5812/numonthly.19680] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 05/29/2014] [Accepted: 06/14/2014] [Indexed: 02/04/2023] Open
Abstract
Background: Renal injury is the main side effect of cisplatin (CP), an anticancer drug. It has been shown that pretreatment with single-dose oxygen (0.5 to six hours) could reduce CP-induced renal toxicity in rats. Objectives: The present study aimed to compare the effects of pretreatment with single-dose and intermittent O2 on CP-induced nephrotoxicity. Materials and Methods: Adult male rats were allocated to seven groups (eight rats in each group). The rats were kept in normal air or hyperoxic environment (O2, 80%) for either a single six-hour period or intermittent six hours per day for seven days and then were subjected to intraperitoneal injection of saline or CP (5 mg/kg) at 48 hours, 72 hours, or seven days after exposure to O2. Three days after CP (or Saline) injection, renal function tests, renal tissue injury scores, and cleaved Caspase-3 and Bax/Bcl-2 genes expression (as markers of renal cell apoptosis) were assessed. Results: Treatment with the 6-hour single-dose O2 reduced renal injury significantly when CP was administrated 48 hours after O2 pretreatment. Pretreatment with intermittent seven days of six hours per day had no protective effects and even relatively worsened renal injury when CP was injected 48 hours or 72 hours after the last session of O2 pretreatment. The beneficial effects of pretreatment with O2 on renal structure and function were seen if CP was administrates seven days after pretreatment with intermittent O2. Conclusions: The pattern of pretreatment with O2 could change this potential and highly protective strategy against CP-induced nephropathy to an ineffective or even mildly deteriorating one. Therefore, O2 administration before CP injection to patients with cancer, for therapeutic purposes or as a preconditioning approach, should be performed and investigated with caution until exact effects of different protocols has been determined in human.
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Affiliation(s)
- Bahram Rasoulian
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, IR Iran
- Department of Physiology and Pharmacology, Lorestan University of Medical Sciences, Khorramabad, IR Iran
| | - Ayat Kaeidi
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, IR Iran
| | - Soheila Pourkhodadad
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, IR Iran
- Corresponding author: Soheila Pourkhodadad, Razi Herbal Medicines Research Center; Lorestan University of Medical Sciences, Khorramabad, IR Iran. Tel/Fax: +98-6613204005,
| | - Omid Dezfoulian
- Department of Pathobiology, School of Veterinary Medicine, Lorestan University, Khorramabad, IR Iran
| | - Maryam Rezaei
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, IR Iran
| | | | - Masoud Alirezaei
- Division of Biochemistry, School of Veterinary Medicine, Lorestan University, Khorramabad, IR Iran
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de Vries DK, Wijermars LGM, Reinders MEJ, Lindeman JHN, Schaapherder AFM. Donor pre-treatment in clinical kidney transplantation: a critical appraisal. Clin Transplant 2013; 27:799-808. [DOI: 10.1111/ctr.12261] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2013] [Indexed: 12/13/2022]
Affiliation(s)
| | | | | | - Jan H. N. Lindeman
- Department of Surgery; Leiden University Medical Center; Leiden The Netherlands
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Saadat A, Shariat Maghani SS, Rostami Z, Davoudi A, Davoudi F, Shafie A, Eynollahi B. Normobaric hyperoxia preconditioning ameliorates cisplatin nephrotoxicity. Ren Fail 2013; 36:5-8. [PMID: 24059271 DOI: 10.3109/0886022x.2013.832604] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Cisplatin is a potent anticancer drug, but its nephrotoxicity limits the clinical use of it. To reduce the Cisplatin-induced nephrotoxicity, various interventions have been implicated. The aim of this study was to examine whether preconditioning with normobaric hyperoxia would prevent Cisplatin-induced nephrotoxicity in patient with solid tumor. METHODS In a prospective study, 80 adult patients with solid tumor who were treated with Cisplatin between February 2011 and December 2011 were included. Forty-three patients were exposed to pure oxygen via non-rebreathing reservoir mask which increased the provided oxygen rate to 60% oxygen for 2 hours at 48, 24, and 6 hours before intravenous administration of Cisplatin and 37 patients received only Cisplatin as a control group. Estimated glomerular filtration rate (eGFR) calculated in all patients on day 1 before and on days 1, 3, 6, 30 after Cisplatin exposures. RESULTS Patients treated with Cisplatin and 60% oxygen showed a mild improvement in eGFR and mild reduction of serum creatinine after 30 days with statistically mild significant differences (p = 0.048). CONCLUSION This study showed that normobaric and intermittent precondition of 60% oxygen prior to Cisplatin treatment had an acute transient adverse effect on renal function; however, the improvement of renal function will be seen after 30 days. Thus, it may help to prevent Cisplatin nephrotoxicity.
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Affiliation(s)
- Alireza Saadat
- Department of Hematology & Oncology, Baghiyatallah University of Medical Sciences , Tehran , Iran
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Kaeidi A, Rasoulian B, Hajializadeh Z, Pourkhodadad S, Rezaei M. Cisplatin toxicity reduced in human cultured renal tubular cells by oxygen pretreatment. Ren Fail 2013; 35:1382-6. [PMID: 24001324 DOI: 10.3109/0886022x.2013.829406] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Cisplatin is an effective and widely used chemotherapy agent and its side effects, particularly nephrotoxicity, limit its usage and related platinum-based drugs. Cisplatin nephrotoxicity is mainly due to extremely increase in reactive oxygen species (ROS) generation leading to kidney tubular cell death. Preconditioning with oxidative stress has been demonstrated to stimulate the cellular adaptation to subsequent severe oxidative stress. Short term oxygen pre-exposure as a mild oxidative stress may enhance some endogenous defense mechanisms, so its effect on Cisplatin induced cell death was investigated in present research. We studied the effects of hyperoxic environment pre-exposure on Cisplatin toxicity in an in-vitro model of cultured human embryonic tubular epithelial cells (AD293). Viability of AD293 cells, as evaluated by MTT-assay, was affected by Cisplatin in a time (1-4 h) dependent model. Biochemical markers of cell apoptosis were evaluated using immunoblotting. Pretreatment with nearly pure oxygen (≥90%) for 2 h significantly reduced the level of cell damage. Activated caspase 3 and Bax/Bcl-2 ratio were significantly increased in Cisplatin-treated cells. Oxygen pretreatment inhibited caspase 3 activation and decreased Bax/Bcl-2 ratio. Oxygen pre-treatment itself not showed any cytotoxicity in exposure times up to 3 h. Our data indicate that hyperoxic preconditioning reduces Cisplatin toxicity in cultured human tubular epithelial cells. The exact mechanism of protection is unclear, though enhancement of some endogenous defense mechanisms and subsequently scavenging of free oxygen radicals may play an important role.
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Affiliation(s)
- Ayat Kaeidi
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences , Khorramabad , Iran
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Zhang Z, Bai X, Du K, Huang Y, Wang W, Zhao Y, Pei Y, Mu J, Han H, Hu S, Li S, Dong H, Lu Y, Hou L, Xiong L. Activation of cholinergic anti-inflammatory pathway contributes to the protective effects of 100% oxygen inhalation on zymosan-induced generalized inflammation in mice. J Surg Res 2011; 174:e75-83. [PMID: 22261596 DOI: 10.1016/j.jss.2011.10.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 10/14/2011] [Accepted: 10/26/2011] [Indexed: 10/15/2022]
Abstract
BACKGROUND The 100% oxygen inhalation has been demonstrated to have a protective effect on mice with zymosan-induced generalized inflammation. However, the underlying mechanism is largely unknown. The present study was designed to explore the role of the cholinergic anti-inflammatory pathway in this animal model. METHODS Oxygen inhalation was given to mice at 4 and 12 h after zymosan injection. One group of mice underwent vagotomy 7 d before zymosan injection. The other two groups of mice either received nicotinic acetylcholine receptor (nAChR) antagonist mecamylamine, or α7 nicotinic acetylcholine receptor (α7nAChR) antagonist methyllycaconitine 30 min before oxygen was given. RESULTS The 100% oxygen treatment significantly decreased the serum level of TNF-α and increased the serum level of IL-10. The pathologic changes of the heart, lung, liver, and kidney were attenuated, as well as the dysfunction of liver and kidney. The 7-d survival rate of zymosan-challenged mice was also improved. Conversely, all these protective effects caused by pure oxygen treatment were abolished in those animals that received anti-cholinergic treatments. CONCLUSIONS The cholinergic anti-inflammatory pathway may be involved in the 100% oxygen protective mechanism against zymosan-induced generalized inflammation in mice.
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Affiliation(s)
- Zishen Zhang
- Department of Anesthesiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, PR China
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Short-time intermittent preexposure of living human donors to hyperoxia improves renal function in early posttransplant period: a double-blind randomized clinical trial. J Transplant 2011; 2011:204843. [PMID: 21559250 PMCID: PMC3087885 DOI: 10.1155/2011/204843] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Revised: 01/05/2011] [Accepted: 01/26/2011] [Indexed: 11/17/2022] Open
Abstract
The purpose of this human study was to investigate the effect of oxygen pretreatment in living kidney donors on early renal function of transplanted kidney. Sixty living kidney donor individuals were assigned to receive either 8-10 L/min oxygen (Group I) by a non-rebreather mask with reservoir bag intermittently for one hour at four times (20, 16, 12, and 1 hours before transplantation) or air (Group II). After kidney transplantation, urine output, blood urea nitrogen (BUN), serum creatinine, need to additional diuretics (NTADs) in the first 24 hours after transplantation, delayed graft function (DGF), the creatinine clearance (CrCL) on 10th day, and duration of hospital stay from the first posttransplant day till normalization of renal function was recorded and compared in two groups. Mean CrCL in posttransplant day 10, NTAD after 24 hours of transplantation, and urine output during 6 hours after operation were significantly better in Group I compared with Group II (P < .05). Also, DGF during the first week after operation and duration of hospital stay was less in Group I compared with Group II. Intermittent exposure of human living kidney donor to hyperoxic environment may improve renal function following kidney transplantation.
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Abstract
The current practice of mechanical ventilation comprises the use of the least inspiratory O2 fraction associated with an arterial O2 tension of 55 to 80 mm Hg or an arterial hemoglobin O2 saturation of 88% to 95%. Early goal-directed therapy for septic shock, however, attempts to balance O2 delivery and demand by optimizing cardiac function and hemoglobin concentration, without making use of hyperoxia. Clearly, it has been well-established for more than a century that long-term exposure to pure O2 results in pulmonary and, under hyperbaric conditions, central nervous O2 toxicity. Nevertheless, several arguments support the use of ventilation with 100% O2 as a supportive measure during the first 12 to 24 hrs of septic shock. In contrast to patients without lung disease undergoing anesthesia, ventilation with 100% O2 does not worsen intrapulmonary shunt under conditions of hyperinflammation, particularly when low tidal volume-high positive end-expiratory pressure ventilation is used. In healthy volunteers and experimental animals, exposure to hyperoxia may cause pulmonary inflammation, enhanced oxidative stress, and tissue apoptosis. This, however, requires long-term exposure or injurious tidal volumes. In contrast, within the timeframe of a perioperative administration, direct O2 toxicity only plays a negligible role. Pure O2 ventilation induces peripheral vasoconstriction and thus may counteract shock-induced hypotension and reduce vasopressor requirements. Furthermore, in experimental animals, a redistribution of cardiac output toward the kidney and the hepato-splanchnic organs was observed. Hyperoxia not only reverses the anesthesia-related impairment of the host defense but also is an antibiotic. In fact, perioperative hyperoxia significantly reduced wound infections, and this effect was directly related to the tissue O2 tension. Therefore, we advocate mechanical ventilation with 100% O2 during the first 12 to 24 hrs of septic shock. However, controlled clinical trials are mandatory to test the safety and efficacy of this approach.
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Rasoulian B, Jafari M, Mahbod M, Dehaj ME, Nowrozi M, Wahhabaghai H, Mofid M, Ghasemi A, Bigdeli MR, Khoshbaten A. Pretreatment with Oxygen Protects Rat Kidney from Cisplatin Nephrotoxicity. Ren Fail 2010; 32:234-42. [DOI: 10.3109/08860221003592838] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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Wahhabaghai H, Rasoulian B, Esmaili M, Mehrani HA, Mohammadhosseniakbari H, Mofid M, Jafari M, Noroozi M, Foadoddini M, Asgai A, Khoshbaten A. Hyperoxia-induced protection against rat's renal ischemic damage: relation to oxygen exposure time. Ren Fail 2010; 31:514-21. [PMID: 19839829 DOI: 10.1080/08860220902963863] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
BACKGROUND Pre-exposure to hyperoxic gas (>or= 95%) has been shown to protect the heart and central nervous system from ischemia-reperfusion injury. In the present study, we investigated whether oxygen pretreatment induces delayed renal protection in rats. The possible role of some renal antioxidant agents was also investigated. MATERIALS AND METHODS Adult male Wistar rats were kept in a hyperoxic (HO) (>or= 95% O(2)) environment for 0.5 h, 1 h, 2 h, 3 h, 6 h, and 2 h/day for three consecutive days and 4 h/day for six consecutive days, and control group (IR) animals were kept in the cage with no HO, one day before subjecting their kidney to 40 minutes of ischemia and 24h of reperfusion. Renal function was assessed by comparing plasma creatinine (Cr), blood urea nitrogen (BUN), creatinine clearance (CLCr), and fractional excretion of sodium (FENa%). Histopathological injury score was also determined according to the Jablonski method. To examine the antioxidant system induction by hyperoxia, we measured renal catalase and superoxide dismutase activity, and renal glutathione and malondialdehyde content. RESULTS Our data demonstrated that only in 4 h/day HO for six consecutive days, the renal function tests (Cr, CLCr, BUN, and FENa%) and Jablonski histological injury were better than control group (p < 0.05). The beneficial effect of oxygen pretreatment in this group was associated with increased renal catalase activity compared with those obtained from control group (p < 0.05). CONCLUSION The present study demonstrates that repeated exposure to hyperoxic (>or= 95% O(2)) environment can reduce subsequent rat's renal ischemia-reperfusion damage. Induction of endogenous antioxidant system may partially explain this beneficial effect of hyperoxic preconditioning.
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Affiliation(s)
- Hannaneh Wahhabaghai
- Trauma Research Center, Baqiyatallah University of Medical Sciences, Teheran, Iran.
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Baharvand B, Dehaj ME, Foadaddini M, Rasoulian B, Poorkhalili K, Aghai HW, Khoshbaten A. Delayed cardioprotective effects of hyperoxia preconditioning prolonged by intermittent exposure. J Surg Res 2009; 160:53-9. [PMID: 19524258 DOI: 10.1016/j.jss.2008.12.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Revised: 12/20/2008] [Accepted: 12/23/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND In our previous study, it was indicated that pre-exposing rats to normobaric hyperoxia could induce a late preconditioning against infarction and arrhythmia. In this study, attempts were made to know whether the intermittent pre-exposure to the same environment could prolong the late phase of hyperoxia preconditioning. METHODS In the first series of experiments, rats were divided into five groups; group 1 was pre-exposed to normal air (NOR) and the other groups to hyperoxic air (O(2)>95%, 120 min once a d) 12, 24, 48, and 72 h (H12, H24, H48, and H72 groups) before 30 min ischemia. In the second series of experiments, rats were pre-exposed to intermittent hyperoxic air (1, 2, or 3 consecutive d) at different times before being subjected to ischemia (H48, H2-48, H2-72, H3-72, and H3-96 groups). The infarct size was measured by triphenyltetrazolium chloride staining, and lead II of electrocardiogram recorded to monitor ischemic-induced arrhythmia. RESULTS Compared with NOR group, the infarct size and incidence of arrhythmia were reduced significantly in H24 and H48 groups. When the exposure periods were enhanced to 2 d, the infarct size did not decrease significantly, but the incidence of arrhythmia reduced. When the pre-exposure times were enhanced to 3 d, both the infarct size and incidence of arrhythmia decreased significantly in H3-72 group, but not in H3-96 group. CONCLUSION These results show that the late phase of hyperoxia preconditioning may last for more than 48 h and prolong by intermittent per-exposure to the same environment.
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Affiliation(s)
- Babak Baharvand
- Division of heart in Shohadaye ashayer hospital of Lorestan University of Medical Sciences, Khoramabad, Iran
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Esmaili Dehaj M, Baharvand B, Rasoulian B, Foadaddini M, Asgari A, Noroozzadeh A, Poorkhalili K, Wahhab Aghai H, Khoshbaten A. Delayed Protective Effects of Hyperoxia Against Cardiac Arrhythmias and Infarction in Anesthetized Rats. J Surg Res 2009; 151:55-61. [DOI: 10.1016/j.jss.2007.12.802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Revised: 12/11/2007] [Accepted: 12/19/2007] [Indexed: 10/22/2022]
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