Attenuation of Cisplathin-Induced Toxic Oxidative Stress by Propofol

AUTHORS

Ghazaleh Taheri Moghadam 1 , Seyed-Mostafa ‎Hosseini-Zijoud 2 , Tavakol Heidary Shayesteh 3 , Hassan Ghasemi 1 , Akram Ranjbar 3 , *

1 Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran

2 Clinical Research Development Unit, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3 Department of Toxicology and Pharmacology, School of Pharmacy, Hamadan ‎University of Medical Sciences, Hamadan, Iran

How to Cite: Taheri Moghadam G, ‎Hosseini-Zijoud S, Heidary Shayesteh T, Ghasemi H, Ranjbar A. Attenuation of Cisplathin-Induced Toxic Oxidative Stress by Propofol, Anesth Pain Med. 2014 ; 4(4):e14221. doi: 10.5812/aapm.14221.

ARTICLE INFORMATION

Anesthesiology and Pain Medicine: 4 (4); e14221
Published Online: September 9, 2014
Article Type: Research Article
Received: August 14, 2013
Revised: April 7, 2014
Accepted: April 23, 2014
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Abstract

Background: Antioxidant effects of propofol (2, 6-diisopropylphenol) were evaluated against cisplatin-i‎nduced oxidative stress in rat.

Objectives: In this experimental study, 20 male rats were equally divided into 4 groups (5 rats each), and were treated by propofol (10 mg/kg/day, IP), or cisplatin (7 mg /kg/day, IP), or both.

Materials and Methods: G‎roup one was control, while group 2 was given cisplatin (7 mg /kg/day, IP). Animals of the third group received only propofol (10 mg/kg/day, IP). Group 4 was given propofol with cisplatin once per day for 7 days. After treatment, blood urea nitrogen, creatinine levels, and oxidative stress m‎arkers such as total thiol groups (TTG), lipid peroxidation (LPO), and total antioxidant ‎capacity (TAC) were measured.

Results: Oxidative stress induced by cisplatin, was evident by a significant increase in LPO and decrease in TTG and TAC. Propofol recovered ‎cisplatin -induced changes in TAC, TTG and LPO in blood.

Conclusions: It is concluded that oxidative ‎damage is the mechanism of cisplatin toxicity, which can be recovered by propofol.‎

Keywords

Propofol Cisplatin Oxibdative stress Rat

Copyright © 2014, Iranian Society of Regional Anesthesia and Pain Medicine (ISRAPM). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

1. Background

In the treatment of malignancy and solid tumors, cisplatin acts as a strong anti-tumor compound. However, the chemotherapeutic property of cisplatin is limited because of its severe side effects such as ototoxicity and n‎ephrotoxicity, which leads to decrease in cisplatin usage (1-3). Furthermore, cisplatin decreases antioxidant power in chemotherapy, as antitumor drugs induce production of free-radicals (4, 5).‎ In previous studies, cisplatin-i‎nduced nephrotoxicity is strongly associated with increase in lipid peroxidation in k‎idney tissues (6). Propofol (2,6-diisopropylphenol) is a widely used intravenous sedative-hypnotic agent for both induction and maintenance of anesthesia and sedation in critically ill patients (7). Structure of the propofol contains a phenolic hydroxyl group and thus resembles that of α-tocopherol (vitamin E), a natural antioxidant. As shown by both in vitro and in vivo studies, the antioxidant activity of propofol results partly from this phenolic chemical structure (8).

Some studies have demonstrated antioxidant effects of propofol in vitro (9, 10) and some in vivo (11). However, propofol affects differently on different cells, and multiple mechanisms may be involved (12) in that. On the other hand, it has been reported that the antioxidant properties of propofol not only inhibit lipid peroxidation, but also scavenger and remove ROS that have been formed (8). Previous studies showed that induction of nephrotoxicity in cisplatin exposure is strongly associated with lipid peroxidation induction in kidney tissues (13). Recently, nephrotoxicity of cisplatin is controlled by sulforaphane through inhibition of antioxidant enzymes and decrease in oxidative or nitrosative stress (2, 14).

2. Objectives

In the present study, we investigated antioxidant properties of propofol on nephrotoxicity in rats treated with cisplatin.

3. Materials and Methods

Trichloroacetic acid (TCA), tetraethoxypropane (TEP), 2, 4, 6 tripyridyl-s-tiazine (TPTZ), 2-thiobarbituric acid (TBA), n- butanol, 2 thionitrobenzoic acid (DTNB), propofol (propofol-Lipuro 1%: Braun Melsungen AG Germany), ethylenediaminetetraacetic acid (EDTA), and cisplatin were used in this study. All other chemicals were obtained from the Sigma.

3.1. Animals and Treatments

In this experimental study, we used male Wistar rats of 180-250 g body weight kept at a 12:12 h light-dark cycle with free access to drinking water and standard laboratory chow. Animals were randomly divided into six groups (5 rats in each group) and then, treated intraperitoneally (IP) for one week.

The design of these treatments resulted in four experimental groups. The groups were as follows: propofol group, control group, cisplatin group, and propofol with cisplatin group. Then, propofol was administered (10 mg/kg/day, IP) (15, 16) alone or in mixture with cisplatin (7 mg /kg/day, IP) (13, 17). Also, control group received only normal saline. Finally, animals were killed 24 hours after the last dose of treatment, and their blood was taken. Blood samples were collected in heparinized tubes, and plasma was immediately separated.

3.2. Kidney Parameters

In present study, blood urea nitrogen (BUN) and creatinine (Cr) levels were measured by automated biochemistry machine a‎according to the standard procedure of Pars azmoon kits.

3.3. Oxidative Stress Biomarkers

Oxidative biomarkers in this study such as lipid peroxidation, total antioxidant capacity and total thiol molecules were measured.

3.4. Measurement of Lipid Peroxidation

In this method, lipid peroxidation (LPO) product in the tissues was determined by thiobarbituric acid (TBA) reagent during an acid heating reaction that expressed the amount of malondialdehyde (MDA) production. At the end, calibration curve of tetramethoxypropane standard solution was used to determine the concentrations of TBA- MDA adduct in the samples (18).

3.5. Measurement of Total Antioxidant Capacity

In this study, total antioxidant capacity (TAC) was calculated with ferric reducing ability of plasma (FRAP) assay. This process is founded upon the ability of plasma in reducing Fe3 + to Fe2 + in the presence of TPTZ. Also, the reaction of Fe2 + with TPTZ gives a complex with blue color and maximum absorption at 593 nm (19).

3.6. Assay of Total Thiol Molecules

In this protocol, total thiol molecules (TTG) evaluated with DTNB reagent. Thiol molecules react with DTNB and create a yellow complex with excellent absorption in spectrophotometer at 412 nm (20).

3.7. Statistical Analysis

Reported data were mean ± SEM of at least three independent experiments performed two times or more. The 1-way analysis of variance (ANOVA), followed by a Tukey post hoc test, was used to compare multiple groups, and all comparisons were significant when P < 0.05.

4. Results

Kidney parameters of creatinine (Cr) level and blood urea nitrogen (BUN) in animal tests are shown in Figure 1 and 2. Propofol caused a significant reduction in Cr and BUN compared with the control group (P = 0.001, P = 0.02, respectively).

4.1. Oxidative Stress Parameters

4.1.1. Lipid Peroxidation

‎Cisplatin changed a significant increase in LPO compared with the control group (P = 0.03). P‎ropofol induced a significant decrease in LPO compared with the cisplatin group (P = 0.03). ‎Coadministration of cisplatin w‎ith propofol decreased cisplatin-induced LPO (P = 0.04) (Figure 3).‎

4.2. Total Thiol Molecules

The value of TTG ‎in propofol group was not significantly different from the control and other groups (Figure 4).

4.3. Total Antioxidant Capacity

Cisplatin caused a significant decrease in TAC when compared with the control group (P = 0.001). Treatment with propofol improved TAC compared with the cisplatin group (P = 0.04). Coadministration of cisplatin with propofol significantly increased TAC level compared with the cisplatin group (P = 0.02) (Figure 5).

Figure 1. Creatinine (mg/dL) Level of Blood Rats
Creatinine (mg/dL) Level of Blood Rats

Values are represented as the mean ± SE 95% CI, (n = 5). aa Significantly different from control group at P ‎‎< 0.05. bb Significantly different from Cis group at P < 0.05. Pf, propofol; Cis, cisplatin; Pf + Cis, propofol + cisplatin‎)

Figure 2. Blood Urea Nitrogen (mg/dL) Level of Rats
Blood Urea Nitrogen (mg/dL) Level of Rats

Values are the mean ± SE 95%CI, (n = 5). aa Significantly different from control group at P ‎‎< 0.05. bb Significantly different from Cis group at P < 0.05. Pf, propofol; Cis, cisplatin; Pf + Cis, propofol+cisplatin‎)

Figure 3. Lipid Peroxidation (LPO) Level in Blood Rats
Lipid Peroxidation (LPO) Level in Blood Rats

Values are the mean ± SE 95%CI, (n = 5). aa Significantly different from control group at P ‎‎< 0.05. bb Significantly different from Cis group at P < 0.05. Pf, propofol; Cis, cisplatin; Pf + Cis, propofol +cisplatin‎)

Figure 4. Total Thiol Molecules (TTM) in Blood Rats
Total Thiol Molecules (TTM) in Blood Rats

Values are the mean ± SE 95%CI, (n = 5). aa Significantly different from control group at P ‎‎< 0.05. bb Significantly different from Cis group at P < 0.05. Pf, propofol; Cis, cisplatin; Pf + Cis, propofol +cisplatin‎)

Figure 5. Total Antioxidant Capacity (TAC) in Blood Rats
Total Antioxidant Capacity (TAC) in Blood Rats

Values are the mean ± SE 95%CI, (n = 5). aa Significantly different from control group at P ‎‎< 0.05. bb Significantly different from Cis group at P < 0.05. Pf, propofol; Cis, cisplatin; Pf + Cis, propofol +cisplatin‎)

5. Discussion

General findings in this study showed the possible toxicity of cisplatin through increasing oxidative injuries. Results indicated that oxidative markers such as LPO, TAC, and TTG are stimulated in contact with cisplatin, although their defense is not sufficient to induce free radicals production. The present results also showed that TTG is decreased by cisplatin. However, propofol indicates antioxidant properties throhout reduction oxidative stress induced by cisplatin. On the other hand, cisplatin toxicity of oxidative reactive agents is characterized by ‎increase in BUN and Cr in the serum. Indeed, oxidative stress induction in cisplatin toxicity is indicated by the increase in ROS and fouling cellular damage as shown by an increase in LPO and decrease in TAC and TTG.

Propofol effect may be due to its chemically similar structure to endogenous antioxidant α-tocopherol (Vitamin E) and theoretically should show similar properties (21). The present result indicates reduction of LPO in the propofol treatment group induced by cisplatin. Numerous antioxidants as free radical scavengers, including flavonoids, vitamin E and vitamin C were reported to have various protective effects in cisplatin-i‎nduced damage (4, 22, 23). The antioxidant effects of propofol may also be due to its capacity in attenuating the formation of lipid peroxides (24), inducing the expression of antioxidant enzyme home oxygenase-1 (10), decreasing the expression of nitric oxide synthase (NOS), (25) and fixing the mitochondrial membrane (26).

Our findings showed that, propofol activates oxidative biomarkers against cisplatin toxicity in plasma. In kidney, cisplatin increases production of oxidative stress biomarkers in nephrotoxicity (13, 27) and produces ‎ROS such as hydroxyl radical and superoxide anion (14, 28). Previous studies showed that increased cisplatin induces LPO biomarkers production‎ such as MDA, 4-hydroxy-2-nonenal (4-HNE), and 8-isoprostane (27, 29, 30). We think it is due to the antioxidant properties of propofol in the blood. Propofol was also shown to endorse mitochondrial activity by stabilizing the transmembrane electrical potential (31, 32) and inhibiting mitochondrial permeability transition pore openings (33), both contributing to suppression of mitochondrion-dependent apoptotic signaling (34).

The damages induced by cisplatin are resulted from free radicals through lipid peroxidation of cell membranes, reduction in antioxidant enzyme and antioxidant substrates to induce oxidative stress, which is the main factor in acute and chronic injuries in different tissues (35). In this study, cisplatin exposure causes a significant increase in LPO production. Most significantly, propofol decreased LPO (Figure 3). These findings are consistent with previous investigations using a variety of antioxidant uptakes (36-38).‎ Recently, in vitro studies showed that propofol could efficiently suppress apoptotic signaling and prevent apoptotic death of myocardial cells encountering fatal stimuli (10, 39, 40). Propofol in experiments on heart tissuess, reversed mitochondrial permeability transition (33) and reduced ischemia–reperfusion damage (41-43). These conclusions support the idea that propofol can prevent the sequences of oxidative stress. Interestingly, as evidenced oxidative damage, these results verify that cisplatin-induced oxidative damage could be improved by propofol. Nevertheless, the strict molecular and cellular mechanisms of an accepted role of propofol (protective role) should be investigated in the future.

Acknowledgements

Footnotes

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