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Adverse effects of metamizole on heart, lung, liver, kidney, and stomach in rats
BMC Pharmacology and Toxicology volume 25, Article number: 55 (2024)
Abstract
Background
Metamizole is banned in some countries because of its toxicity, although it is widely used in some European countries. In addition, there is limited information on its safety profile, and it is still debated whether it is toxic to the heart, lungs, liver, kidneys, and stomach.
Aims
Our study investigated the effects of metamizole on the heart, lung, liver, kidney, and stomach tissues of rats.
Methods
Eighteen rats were divided into three groups, wassix healthy (HG), 500 mg/kg metamizole (MT-500), and 1000 mg/kg metamizole (MT-1000). Metamizole was administered orally twice daily for 14 days. Meanwhile, the HG group received pure water orally. Biochemical, histopathologic, and macroscopic examinations were performed on blood samples and tissues.
Results
Malondialdehyde (MDA), total glutathione (tGSH), superoxide dismutase (SOD), and catalase (CAT) in the lung and gastric tissues of MT-500 and MT-1000 groups were almost the same as those of the HG (p > 0.05). However, MDA levels in the heart and liver tissues of MT-500 and MT-1000 groups were higher (p < 0.05) compared to the HG, while tGSH levels and SOD, and CAT activities were lower (p < 0.05). MDA levels of MT-500 and MT-1000 groups in the kidney tissue increased the most (p < 0.001), and tGSH levels and SOD and CAT activities decreased the most (p < 0.001) compared to HG. Metamizole did not cause oxidative damage in the lung and gastric tissue. While metamizole did not change troponin levels, it significantly increased alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN), and creatinine levels compared to HG. Histopathologically, mild damage was detected in heart tissue, moderate damage in liver tissue, and severe damage in renal tissue. However, no histopathologic damage was found in any groups’ lung and gastric tissues.
Conclusion
Metamizole should be used under strict control in patients with cardiac and liver diseases and it would be more appropriate not to use it in patients with renal disease.
Introduction
Metamizole (MT) is known to be a non-narcotic pyrazolone derivative analgesic drug [1]. In addition, metamizole is included in the group of nonsteroidal anti-inflammatory drugs (NSAIDs) with analgesic and antipyretic effects with spasmolytic properties [2]. The mechanism of analgesic action of MT is complex, but there is a view that it may be related to suppression of a central cyclooxygenase-3 (COX-3) and stimulation of cannabinoid and opioidergic systems [3]. It has been suggested that its antipyretic effect is associated with cyclooxygenase-2 (COX-2) inhibition [4]. The critical feature of its antipyretic effect is that it reduces fever by inhibiting both prostaglandin-E2 (PGE2)-dependent and independent pathways [5]. The spasmolytic effect of MT is connected with a decrease in intracellular Ca2+ release through the inhibition of inositol phosphate synthesis [3]. Due to its excellent analgesic, antipyretic, and spasmolytic properties and good gastrointestinal tolerability, MT has been widely used worldwide [5]. It is mainly preferred in migraine, cancer-related, postoperative, and colic pain treatment [4].
However, conflicting data on the toxic effects of metamizole in different tissues are encountered in literature reviews, and information on its safety profile is also limited. For instance, the Dutch Drug Evaluation Board recently approved the oral formulation of metamizole [6]. On the contrary, metamizole is banned in some countries due to its severe side effects, such as agranulocytosis [7]. However, studies have suggested that the metamizole-related agranulocytosis risk is exaggerated [3]. In addition, studies have shown no tangible relationship between metamizole and aplastic anemia [8]. According to another report, metamizole is not administered to pregnant women despite evidence indicating no risk of teratogenic and embryotoxic effects [3]. Conflicting information on different organs regarding the toxicity of metamizole persists as well. A recent study reported very low cardiovascular side effects of metamizole [8]. Retrospective studies have suggested that metamizole is more hepatotoxic than paracetamol [9]. However, Drobnik reported that the liver toxicity of metamizole was low [3]. Studies conducted to investigate the toxic effects of metamizole argued that metamizole leads to tubular necrosis and acute tubulointerstitial nephritis in the kidneys [10]. Conversely, a recent study claimed that metamizole is suitable for patients with impaired renal function, emphasizing that it has few renal side effects [8]. Studies postulated that metamizole is safer for the gastrointestinal (GI) system and kidneys than other NSAIDs and can be used alternatively in patients at high risk of gastric or renal disorders [11]. In a case-control study, it was stated that the risk of GI bleeding was higher in metamizole users compared to aspirin and other NSAIDs [1]. No information on the pulmonary toxicity of metamizole was found in the literature. Although metamizole is frequently used for therapeutic purposes, toxicity data in many organs seem contradictory or insufficient. Therefore, we purposed to analyze metamizole’s toxic and oxidative impact on heart, lung, liver, kidney, and gastric tissues at medium and high doses in rats.
Materials and methods
Animals
Eighteen male albino Wistar rats (277–286 g, 6–7 weeks old) were employed in the experiment. Animals were purchased from the Experimental Animals Research and Application Center at Erzincan Binali Yıldırım University. The rats were housed in an appropriate laboratory environment at a room temperature of 22 °C, 12 h in darkness, and 12 h in light; humidity levels were 30–70%. Experimental animals were fed pellet chow, tap water, and ad libitum. All experiments were performed according to the guidelines from Directive 2010/63/EU of the European Parliament (Approval Number 2016-24-199) and the ARRIVE guidelines [12].
Chemicals
Thiopental sodium (500 mg vial) was provided by Ibrahim Etem Ulagay (Türkiye). Metamizole (500 mg tablet) from Sanofi Aventis (Türkiye).
Experimental groups
The rats were randomly divided into three groups (N = 6) [13, 14]: healthy (HG), metamizole 500 mg/kg (MT-500), and metamizole 1000 mg/kg (MT-1000) administered group.
Experimental procedure
Metamizole was given in MT-500 and MT-1000 groups orally by gavage. The HG group was similarly given pure water. These processes were continued for 14 days [15], twice daily [15, 16]. At the end of the 14th day, blood was collected from the hearts of all rats and then euthanized with 50 mg/kg thiopental sodium (intraperitoneal). The heart, lung, liver, renal, and gastric tissues were removed to measure malondialdehyde (MDA), total glutathione (tGSH), superoxide dismutase (SOD) and catalase (CAT) levels biochemically. Gastric tissue was examined macroscopically, and other tissues were examined histopathologically. The levels of troponin I (TpI), alanine aminotransferase (ALT), aspartate aminotransferase (AST), Blood Urea Nitrogen (BUN), and creatinine were analyzed in blood samples.
Biochemical analyzes
Measurement of MDA, tGSH, SOD, CAT, and protein
MDA, tGSH, and SOD were determined in the supernatants prepared from tissue samples through the utilization of enzyme-linked immunosorbent assay (ELISA) rat kits (Cat no:10009055; 703002; 706002, respectively, Cayman Chemical Company). Analyses were performed according to the steps in the application procedure included in the kits. Goth method was used for CAT [17] and the Bradford method for protein [18].
Measurement of blood serum TpI
TpI levels were measured using the ELFA (Enzyme-Linked Fluorescent Assay) technique in the VIDAS Troponin I Ultra kit.
Measurement of blood serum ALT and AST
Serum ALT and AST activities were measured spectrophotometrically, and Cobas 8000 autoanalyzer (Roche Diagnostics GmBH, Germany) and ALT and AST kits (Roche Diagnostics) were used for this purpose.
Measurement of blood serum BUN and creatinine
Serum BUN and creatinine levels were measured spectrophotometrically using the Roche Cobas 8000 autoanalyzer (Roche Diagnostics GmBH, Germany). BUN was reckoned by the following formula. BUN = Serum Urea Level x 0.48. The creatinine analysis was based on the Jaffe method [19].
Histopathological analysis
Tissue samples were kept in 10% formalin to ensure tissue stability. They were then dehydrated in graded alcohol (70–99%). Tissues were made transparent using xylol and then embedded in paraffin. Sections were obtained from these paraffin blocks and stained with hematoxylin and eosin. Tissue samples were analyzed by light microscopy (DP2-SAL firmware program, Olympus Inc., Japan). Findings in six randomly selected microscopic fields were evaluated as as (+) mild, (++) moderate and (+++) severe according to Table 1 [20].
Statistical analysis
All analyses were carried out by IBM SPSS 22.0 Statistics Program for Windows (IBM Corp., released in 2013, Armonk, NY, USA). All results were shown as mean value ± standard error of the mean (SEM). The normality of distribution for the data was assessed using the Shapiro-Wilk test. Normally distributed data were tested with one-way ANOVA, and then post hoc Tukey HSD or Games-Howell tests were used. Kruskal-Wallis test,, followed by Mann-Whitney U-test, was used to analyze non-normally distributed data. p < 0.05 was used for statistical significance.
Results
Biochemical results
MDA, tGSH, SOD, and CAT analysis results of the heart tissue
In Fig. 1, the heart tissue MDA levels of the rats in the MT-500 and MT-1000 were slightly increased than in the healthy rats (p < 0.05). tGSH levels and SOD, and CAT activities were slightly decreased compared to HG (p < 0.05). The difference between MDA and tGSH levels and SOD, and CAT activities in the heart tissue of MT-500 and MT-1000 was insignificant (p > 0.05) (Table 1).
MDA, tGSH, SOD, and CAT analysis results of the lung tissue
MDA and tGSH levels and SOD and CAT activities in the lung tissue of MT-500 and MT-1000 group animals were almost the same as those of the HG group (p > 0.05) (Fig. 2; Table 1).
MDA, tGSH, SOD, and CAT analysis results of the liver tissue
In Fig. 3, the MDA levels of MT-500 and MT-1000 group animals were increased compared to the healthy rats (p < 0.05). In addition, tGSH levels and SOD, and CAT activities were decreased (p < 0.05). Similarity was found between metamizole groups in terms of antioxidant data (p > 0.05) (Table 1).
MDA, tGSH, SOD, and CAT analysis results of the renal tissue
The kidney tissue MDA levels of MT-500 and MT-1000 group animals were increased according to the healthy rats (p < 0.001). Likewise, tGSH levels and SOD, and CAT activities were decreased (p < 0.001). The difference between MDA and tGSH levels and SOD and CAT activities of MT-500 and MT-1000 was found to be insignificant (p > 0.05) (Fig. 4; Table 1).
MDA, tGSH, SOD, and CAT analysis results of the gastric tissue
MDA and tGSH levels and SOD, and CAT activities in the gastric tissue of MT-500 and MT-1000 group animals, were almost the same as the HG group (p > 0.05) (Fig. 5; Table 1).
Blood serum TpI analysis results
In Fig. 6A, the blood serum TpI levels in the MT-500 and MT-1000 were insignificant according to the control rats (p > 0.05). Similarly, the difference between the TpI levels of the MT-500 and MT-1000 was also insignificant (p = 1.000) (Table 2).
Blood serum ALT and AST analysis results
Blood serum ALT activity of MT-500 and MT-1000 group animals was increased according to the control rats (p < 0.001). However, the difference between ALT levels of MT-500 and MT-1000 groups was insignificant (p = 1.000) (Fig. 6B; Table 2).
Similarly, according to the HG group, blood serum AST activity was increased in the MT-500 and MT-1000. The difference between AST levels of MT-500 and MT-1000 was insignificant (p = 0.617) (Fig. 6C; Table 2).
Blood serum BUN and creatinine analysis results
As shown in Fig. 6D-E, the blood serum BUN and creatinine levels of MT-500 and MT-1000 group animals were significantly raised according to the control rats (p < 0.001). Insignificant difference between the BUN and creatinine levels of MT-500 and MT-1000 groups was found (p > 0.05) (Table 2).
Histopathological analysis results
Figure 7A shows that no damage sign was found in the heart tissue of the HG group. However, mild degeneration in cardiac myocytes and mild mononuclear cell infiltration in interstitial areas were found in animals treated with 500 mg/kg and 1000 mg/kg of metamizole (Fig. 7B-C-D-E). As seen in Fig. 8A-B-C, no histopathologic damage was observed in the HG, MT-500, and MT-1000 lung sections. The normal histologic appearance was found in the liver tissue of the HG group (Fig. 9A). Moderate necrosis was found in the liver section of MT-500 and MT-1000 (Fig. 9B-C). No histopathologic damage was found in the renal tissue of the HG group (Fig. 10A). However, severe interstitial nephritis in intertubular areas, moderate hemorrhage in intertubular areas, and degeneration of tubular epithelial cells were found in the renal tissues of MT-500, and MT-1000 groups (Fig. 10B-C-D-E).
Macroscopic appearance of gastric tissue
No macroscopic damage was detected in the gastric tissue in HG, MT-500, and MT-1000 groups as seen in Fig. 11A-B-C.
Discussion
Metamizole is widely used for pain relief due to its potent analgesic, antipyretic, and spasmolytic properties [21]. However, the debate regarding the benefits and risks of this analgesic drug is still an ongoing concern. The articles highlight the need for high-quality and adequately sized studies evaluating the medium and long-term safety of metamizole [22]. Our study investigated the effects of metamizole on heart, lung, liver, renal, and gastric tissues at medium and high doses biochemically and histopathologically in rats. The heart tissue MDA levels of the metamizole-treated animals were slightly higher, and antioxidants were slightly lower than the HG, biochemically. MDA is a toxic oxidant product formed by reactive oxygen species (ROS) oxidizing cell membrane lipids (LPO) [23]. tGSH is an endogenous non-enzymatic antioxidant, while SOD and CAT are enzymatic antioxidants [24]. Literature reviews report that the cardiovascular side effects of metamizole are very low [8]. In our current study, both medium and high doses of metamizole were able to show a slight but significant reduction in tGSH levels and SOD, and CAT activities as well as a slight but significant increase in MDA levels, which have altered the oxidant/antioxidant balance of metamizole in against antioxidants in some extend. The reason for the decrease in tGSH levels and SOD and CAT activities in damaged tissues is the excessive consumption of antioxidants while neutralizing ROS [25, 26]. Although oxidative stress was observed in the heart tissue of the metamizole group, no significant change was found in TpI levels in blood serum. As is known, an increase in serum TpI is an important indicator of myocardial damage [27]. Interestingly, the metamizole group’s serum TpI levels were almost the same as those in the HG, suggesting no severe damage to the cardiac muscles.
Histopathologically, no structural abnormality was observed except mild degeneration in the myocytes of the metamizole 500 and 1000 mg/kg dose groups and mild mononuclear cell infiltration in the interstitial areas.
The current study’s biochemical and histopathological findings showed that metamizole administered at medium and high doses did not cause damage to the lung tissue. Correspondingly, previous studies stated that metamizole might be used safely in patients with chronic obstructive pulmonary disease when required since it does not impair lung function [28]. Alpaslan et al. also demonstrated by microscopic examination that metamizole is not toxic to the lungs [29]. Metamizole has a favorable effect leading to improved airway function in asthmatic patients with moderate airway obstruction [30].
The biochemical findings of the present study reveal that medium and high doses of metamizole cause significant oxidative stress in the liver tissues. In addition, the substantial increase in MDA and the decrease in tGSH levels and SOD, and CAT activities in the MT-500 and MT-1000 groups show that oxidative stress was markedly induced in liver tissue compared to the heart tissue-treated groups. However, some studies have emphasized that the risk of liver impairment during MT treatment is relatively low [3]. A recent study showed that 500 and 1000 mg/kg metamizole doses caused moderate liver damage [15]. Yapar et al. found that the administration of high doses of metamizole to mice resulted in an increase in liver oxidant levels and a decrease in GSH levels [31]. Bedir et al. reported that in animals treated with metamizole, liver damage markers ALT and AST activities increased in blood serum simultaneously with oxidant parameters in the liver tissue [15]. Similarly, in a present study, ALT and AST activities of metamizole groups increased parallelly to liver tissue oxidant parameters. In the histopathological examination, we observed moderate tissue damage in the liver tissue in the MT 500 and 1000 groups, supporting the changes in biochemical parameters. Consistently, a previous study histopathologically observed that moderate necrosis developed in the liver tissue of 500 and 1000 mg/kg MT groups in response to oxidative stress [15].
Metamizole substantially increased MDA and decreased tGSH levels and SOD, and CAT activities in renal tissue. A recently published study emphasized that metamizole has few renal side effects and is particularly suitable for patients with impaired renal function [8]. In contrast, another study showed that metamizole can cause tubular necrosis and acute tubulointerstitial nephritis. However, these pathological findings have not been associated with oxidant tissue damage [10]. Moreover, no information was found showing metamizole-induced oxidative damage to the kidneys. Alongside the significant increase in tissue MDA levels, histopathologically severe interstitial nephritis, hemorrhage, and degeneration of tubular epithelial cells were observed in metamizole groups. A recent study, consistent with our results, showed that oxidative stress is closely associated with renal tissue damage [32].
The effect of metamizole on the GI tract is confusing in the literature. Some studies suggest that metamizole is safer for the GI tract than other NSAIDs [11]. Some emphasize that the risk of GI bleeding is higher in metamizole users compared to aspirin and other NSAIDs [1]. Gastrotoxic drugs are known to cause damage to the gastric mucosa in the form of marked hyperemia, round oval, and irregular mucosal defects of different numbers and diameters [33]. It has also been documented that the severity of this macroscopic damage in gastric tissue is directly related to the increase in oxidants and decrease in antioxidants [34]. However, our experimental results showed that metamizole did not alter the balance between oxidant and antioxidant parameters in the gastric tissue of the animals. Macroscopically, the gastric mucosal surface was not different from that of the healthy group.
Conclusions
The effects of medium and high doses of metamizole on the heart, lung, liver, kidney, and stomach were investigated biochemically and histopathologically and evaluated by comparison. Both our biochemical and histopathological findings showed that metamizole did not cause damage to the lung and stomach tissue. However, metamizole caused mild oxidative damage in heart tissue, moderate oxidative damage in liver tissue, and severe oxidative damage in renal tissue. Metamizole had similar toxicity at both 500 and 1000 mg/kg doses. The findings of this study indicate that metamizole can be used in patients with lung and stomach diseases. Strict control is required in patients with liver and heart diseases, and it would be more appropriate not to use in patients with renaldisease.
Limitations
At the same time, it is essential to investigate the effects of metamizole on all organs and tissues on a larger scale and to measure more parameters to clarify the mechanism of its toxic effect.
Data availability
No datasets were generated or analysed during the current study.
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S.C.: writing-original draft, writing-review and editing, funding acquisition. B.S.: Conceptualization, data curation, funding acquisition, investigation, software, supervision, validation, visualization, writing-original draft, writing-review and editing. R.M.: Investigation, methodology, project administration, resources, writing-original draft, writing-review and editing. R.C.: Validation, writing-review and editing. T.A.C.: Conceptualization, investigation, methodology, project administration, formal analysis, writing-original draft, writing-review and editing. B.M.: writing-original draft, writing-review and editing. H.S.: Conceptualization, data curation, methodology, project administration, writing-original draft, writing-review and editing. S.C.: Methodology, resources, writing-original draft, writing-review and editing. B.C.: Revision, writing-original draft, writing-review and editing. Z.S.: Investigation, methodology, writing-original draft, writing-review and editing.
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This study was approved by the Erzincan Binali Yildirim University Animal Experimentation Local Ethics Committee (Date: 27.10.2022 No: 54). It was conducted in accordance with local legislation and institutional requirements.
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Ciftel, S., Suleyman, B., Mammadov, R. et al. Adverse effects of metamizole on heart, lung, liver, kidney, and stomach in rats. BMC Pharmacol Toxicol 25, 55 (2024). https://doi.org/10.1186/s40360-024-00780-4
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DOI: https://doi.org/10.1186/s40360-024-00780-4