|Year : 2021 | Volume
| Issue : 1 | Page : 124-129
Creatine and α-lipoic acid improved depressive behavior induced by interferon-α in mice: Malondialdehyde level remained unchanged
Azadeh Mesripour1, Zahra Karimi2, Mohsen Minaiyan2
1 Department of Pharmacology and Toxicology, Isfahan University of Medical Sciences, Isfahan, Iran; Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
2 Department of Pharmacology and Toxicology, Isfahan University of Medical Sciences, Isfahan, Iran
|Date of Submission||22-Nov-2020|
|Date of Acceptance||15-Mar-2021|
|Date of Web Publication||31-May-2021|
Dr. Azadeh Mesripour
School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Hezarjerib Boulevard, Isfahan.
Source of Support: None, Conflict of Interest: None
Objective: Interferon-alpha (IFNa) is a cytokine with various biological roles but it may induce psychological adverse effects. Introducing alternative medicine is essential to prevent this side effect. This study was performed to determine the antidepressant effects of creatine (Crt) and α-lipoic acid (ALA). Materials and Methods: Female albino mice (6–8 weeks old) were used. IFNa (16×105 IU/kg/day, SC), Crt (5 and 10 mg/kg, gavage feeding tube), and ALA (20 and 40 mg/kg, IP) were administered for 6 days. After the locomotor test, behavioral parameters of depression, including immobility during the forced swimming test (FST), and finally serum malondialdehyde (MDA) were measured as factors for oxidative stress. Results: There was not important difference regarding the locomotor test. Crt 5 mg/kg and ALA 40 mg/kg when administered alone reduced the immobility time during FST when compared with the control groups (75±15 and 82±16 s, respectively, P < 0.05). Crt 5 mg/kg and IFN co-administration reduced the immobility time to 108±23 s, which was lower than that of the IFNa alone group (156±8 s, P < 0.05). Administrating ALA 40 mg/kg and IFNa together showed same results (95±11 s vs. IFNa alone group, P < 0.01). The results of measuring MDA did not show noticeable difference. Conclusion: In general, improvement of behavioral parameters in mice treated with Crt and ALA indicates a clear effect of these two compounds in modulating mood and depressive behaviors. Although MDA level differences were not observed, Crt and ALA modulation in the neurotransmitter system may be involved in their antidepressant effects.
Keywords: Alpha lipoic acid, creatine, depression, interferon alpha, malondialdehyde
|How to cite this article:|
Mesripour A, Karimi Z, Minaiyan M. Creatine and α-lipoic acid improved depressive behavior induced by interferon-α in mice: Malondialdehyde level remained unchanged. J Rep Pharma Sci 2021;10:124-9
|How to cite this URL:|
Mesripour A, Karimi Z, Minaiyan M. Creatine and α-lipoic acid improved depressive behavior induced by interferon-α in mice: Malondialdehyde level remained unchanged. J Rep Pharma Sci [serial online] 2021 [cited 2021 Jun 15];10:124-9. Available from: https://www.jrpsjournal.com/text.asp?2021/10/1/124/317263
| Introduction|| |
Interferon-alpha (IFNa) belongs to type I IFNs, cytokines with a variety of biological roles in anti-viral, anti-proliferation, anti-tumor, and apoptotic pathways. Evidently, IFNa not only shortens hospitalization period in COVID-19 patients, but also augments viral clearance. IFNa-related depression is an important drawback in medicine and neurology; various studies have introduced alternative and complementary medicines in order to prevent this side effect., Various mechanisms are suggested for IFNa inducing psychological effects. For instance, activation of indoleamine 2,3-dioxygenase (IDO) due to a shift in metabolizing tryptophan to quinolinic acid, N-methyl-d-aspartate (NMDA) receptor agonists, results in excitotoxicity and loss of neurons in the hippocampus. Moreover, a decrease in serotonin production has been connected to neurochemical changes related to depression. Evidently, there is a key role for massive Ca 2+ influx through the NMDA channel as a trigger of excitatory neurotransmitter (glutamate) neurotoxicity and neuronal cell death. Results proved that initial mitochondrial impairment plays a critical role in glutamate neurotoxicity. In addition, depression-like behavior in animals is linked to mitochondrial inefficiency in brain regions associated with neural circuitry of depression such as frontal cortex and hippocampus.
Creatine (Crt) is synthesized endogenously from three amino acids, arginine, glycine, and methionine, in the liver, kidney, and brain or it can be obtained from high-protein foods. Crt supplementation has been studied in neurological diseases that may be related to mitochondrial impairment, such as Parkinson’s disease. Researches show that Crt by buffering adenosine triphosphate (ATP) levels could protect neuros against neurotoxic substances such as harmful levels of glutamate.
Alpha-lipoic acid (ALA), also known as 1,2-dithiolane-3-pentanoic acid, is a natural essential co-factor for pyruvate and alpha-ketoglutarate dehydrogenase within the mitochondria. Exogenous ALA is used as an antioxidant dietary supplement in some regions including Europe and America and Japan. More than a decade ago, the antidepressant effect of ALA was assumed by Salazar. In addition, it has been proven that ALA ameliorates cognitive dysfunction in memory tasks in rats by lowering age-associated oxidative damage; ALA reverses mitochondrial structural decay and improves mitochondrial function.
Psychiatric side effects and mood changes caused by IFNa are common but generally mild. Therefore, pretreatment with common antidepressant drugs might expose individuals to excessive medications, thus presenting that a harmless complementary medicine would be valuable. Additionally, a major limitation of available monoaminergic-based antidepressant drugs is their long lag period (approaches about 4 weeks) for starting their therapeutic effects. Based on the hypothesis that mitochondria might be involved in the pathophysiology of depression, in the following experiments, an observation study was conducted in order to evaluate the effect of Crt and ALA, following IFNa-induced depressive-like behavior in mice. The serum malondialdehyde (MDA) level was also assessed as a marker of lipid peroxidation.
| Materials and Methods|| |
Female albino mice weighing 24±3 g (6–8 weeks old) were chosen according to the previous studies, suggesting that Crt effects on depressive behavior are sex-dependent, as female rats had shown better antidepressant-like response. Animals were maintained at room temperature 21± 2°C with free access to standard mice chow and tap-water, on a 12–12 h light–dark cycle (lights were on till 6 a.m.). In total, 12 groups of animals consisting of six were studied. Six animals were housed together in each cage, and they were placed in the experimental room 24 h before the test for acclimatization. All the experiments were performed between 8 a.m. and 1 p.m. in the pharmacology laboratory. All animal procedures were performed in accordance with Guidelines for the Care and Use of Laboratory Animals issued by The National Ethical Committee of Iran and approved by Vice-Chancellor in Research Affairs-Medical University of Isfahan (Ethical No. IR.MUI.REC.1399.180). All the efforts in the experiments were made to minimize animal suffering and to reduce the number of animals used in the experiments.
IFNa (PDferon, Pooyesh Darou 3×106 IU, Iran) 16×105 IU/kg was injected SC. Crt monohydrate (Karen Pharma and Food Supplement, Iran) 5 and 10 mg/kg was administered by a daily gavage feeding tube. ALA (Sigma Aldrich, India) 20 and 40 mg/kg was injected IP (the doses were based on pilot studies). Control groups were injected with normal saline; in the sham group, animals received normal saline by a gavage feeding tube. All treatments were done for 6 consecutive days, and the tests were performed on the following day. In a separate group of mice, the concomitant administration of Crt 5 mg/kg and ALA 20 mg/kg was evaluated on IFNa-induced depression-like behavior.
The locomotor activity of mice was assessed prior to the forced swimming test (FST) in an open arena (Borj Sanat, Iran) divided into 15 zones by red beams. Mice were allowed to explore the field for 3 min; by passing through the beams, the number of zone entries was counted automatically while rears on hind-legs were recorded manually. Finally, the total activity for each animal was calculated which was the sum of zone entries (horizontal exploration) and rears (vertical exploration).
Forced swimming test (FST)
This test was performed as an animal model of despair behavior. Mice were forced to swim in 25°C water in a glass 2-L beaker (diameter 12.5 cm, depth 12 cm) for 6 min. The immobility time defined, when no additional activity was observed other than that required to keep the animals’ head above the water, was measured during the last 4 min of the trial after habituation was considered at the first 2 min. Swimming behavior is defined as horizontal movement throughout the beaker which involved at least two limbs; climbing behaviors defined as upward movements of the forepaws along the side of the beaker were also recorded. The whole experiment was recorded by a camera and analyzed later. After 6 min, the mice were dried carefully to avoid hypothermia and returned to their home cage.
Serum MDA level
After the experiments, animals were decapitated and jugular blood samples were collected and maintained for 30 min at room temperature. Following centrifugation (3000 rpm, 20 min), serum was transferred to small-capped vials and stored frozen (−20°C) until analyzed. All the process for evaluating the activity of MDA was performed according to the company instruction of the Nalondi Lipid Peroxidation MDA Assay Kit (Navand Lab Kit, Iran), and absorbance was measured at 532 nm.
Data processing and statistical analysis
Results were expressed as group mean ± SEM. All results were analyzed by one-way analysis of variance (ANOVA), followed by Tukey’s multiple comparison tests. P-values less than 0.05 were considered significant. The software programs used for data analyzing and making graphs were Excel 2010 and GraphPad Prism 8.
| Results|| |
The effect of Crt on depressive behavior following IFNa administration
According to [Figure 1]A, Crt 5 mg/kg significantly reduced the immobility time (75±15 s compared with the sham group 136±14 s, P < 0.05), which indicated its antidepressant-like effects. Following IFNa injection, immobility time was significantly higher than that of the control (156±8.2 s vs. 107±9.1 s, P < 0.05), which showed despair behavior. Following the co-administration of Crt 5 mg/kg and IFNa, the immobility time reduced to 108±23 s that was noticeably lower than that of the IFNa alone group, while adding ALA 20 mg/kg to Crt 5 mg/kg did not show any additive effect on the immobility time. The treatments did not cause important changes in the locomotor activity [Table 1]; this indicates that the change in immobility time during the FST could be considered as depressive-like behavior. Swimming and climbing were also measured during the FST for describing the possible neurotransmitter involved in the depression behavior. Climbing values did not show important difference among the groups [Table 1]. By administrating Crt 10 mg/kg swimming was noticeably higher than control, and by co-administrating Crt with IFNa, the values were significantly higher than those of the IFNa alone group.
|Figure 1: The effect of Crt and ALA on the immobility time during the FST. A. Crt 5 and 10 mg/kg, the sham group received normal saline via gavage tube. B. ALA 20 and 40 mg/kg, the vehicle group received normal saline by IP injection. IFNa 16×105 IU/kg, and the control group received normal saline by SC injection. Results are expressed as group mean ± SEM and analyzed by ANOVA, followed by Tukey’s comparison tests (n=6). $P<0.05 compared with the sham or the vehicle group, *P<0.05 compared with the control group, #P<0.05 and ##P <0.01 compared with the IFNa alone group|
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|Table 1: The effect of Crt alone and together with IFNa and ALA on the locomotor test and the active stages of FST|
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The effect of ALA on depressive behavior following IFNa administration
As presented in [Figure 1B], the administration of ALA 40 mg/kg significantly reduced the immobility time during the FST (82±16 s vs. control 127±10 s, P < 0.05). Co-administrating ALA 40 mg/kg and IFNa induced antidepressant-like effects, since the immobility time was lower (95±11 s) than that of the IFNa alone group (156±8 s, P < 0.01); adding Crt to the treatment did not have additive antidepressant effect. At the prescribed doses, the total activity during the locomotor test did not show important differences between groups [Table 2]. The active phase in the FST showed important differences in the swimming time; ALA 40 increased swimming time when it was administered alone compared with vehicle (P < 0.05), and together with IFNa (P < 0.05 vs. IFNa alone), climbing time was higher than control when ALA 40 mg/kg was injected with IFNa.
|Table 2: The effect of ALA alone and together with IFNa and Crt on the locomotor test and the active stages of FST|
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Serum MDA concentration
The serum MDA concentrations did not show important differences among different groups [Table 3].
| Discussion|| |
The following research clearly showed that IFNa increased the immobility time in the FST, which is an indication for depression-like behavior in mice. Crt and ALA improved depressive behavior caused by IFNa. FST is a principal test used to assess the efficacy of antidepressant substances and the effects of various neurobiological fluctuations preclinically. The locomotor is accompanied prior to the FST test in order to understand the possible sedative or excitatory effects of drugs that could distort the FST results.
IFNa-induced depression-like effect was in agreement with previous findings. It has been shown that a soybean diet as a good source for tryptophan could improve IFNa depression, probably by increasing the brain serotonin level. Several mechanisms are suggested for IFNa-induced depression; one possible mechanism is related to the activation of IDO that results in neurotoxicity due to an increased level of quinolinic acid, an NMDA receptor agonist. Additionally, it was shown that in mouse bone marrow cells, IFNa and IFN-beta mediated apoptosis by mitochondrial apoptotic pathway and reactive oxygen species.
Crt administration reduced the immobility time during FST; it also prevented IFNa from causing depression-like behavior. The main energy source in the brain is ATP, which is tightly coupled to phosphocreatine (PCr). Crt exerts neuroprotective effects as a substrate for Crt kinase, it increases PCr that converts adenosine diphosphate to ATP and prevents ATP depletion. The mitochondria and Crt and PCr establish a system that is critical in energy homeostasis in high energy-demanding organs, such as the brain. Crt by stimulating the rate of ATP synthesis and producing high amounts of PCr may have prevented the IFNa-induced neuron loss and depression-like effect in mice. It has been advocated previously that the buildup of PCr could help neurons endure ATP levels for a prolonged period of time, especially during energy depletion or stress conditions. In addition, Crt effect on the neurotransmitters could be important in improving depressive behavior and should also be considered. A shortcoming of this research was that the neurotransmitter levels were not evaluated and it is suggested in future research. By measuring swimming and climbing time in the FST, the possible neurotransmitters involved could be speculated. The catecholaminergic agents decrease immobility time while increasing the climbing behavior, and serotonin-related compounds such as fluoxetine decrease immobility time while increasing swimming behavior. Crt when administered alone and in combination with IFNa increased swimming time which may be related to the increased serotonin level. This was supported by a previous study which showed that female rats fed with Crt maintained higher swimming activity with no differences in climbing activity. On the contrary, oral Crt has been found to increase brain dopamine synthesis in the substantia nigra of mice by protecting against striatal dopamine depletion; also Crt can enhance tyrosine hydroxylase activation, a rate-limiting enzyme for catecholamine biosynthesis., In addition, it was shown that Crt supplementation reduces the tryptophan: tyrosine ratio, suggesting that Crt modulates brain serotonin and dopamine level. Injecting ALA reduced the immobility time during the FST, and this change was pronounced with ALA 40 mg/kg. ALA antidepressant-like effects demonstrated in the FST are in agreement with previous results., Oxidative stress has been involved in the pathogenesis of psychiatric illnesses, such as major depression disorder. ALA is a mitochondrial antioxidant and a neuroprotective substance; therefore, the beneficial effects of ALA in improving depression-like behavior support the hypothesis that antioxidants could have antidepressant properties. The swimming time was higher than normal when ALA 40 mg/kg was administered alone. While ALA was co-administered with IFNa, both swimming time and climbing time were higher than those with IFNa alone. It has been assumed that ALA by increasing tryptophan availability in the blood may contribute to the treatment of depression. Synthesis of serotonin depends on the concentration of tryptophan (precursor to serotonin) in the blood and the activity of tryptophan hydroxylase, a rate-limiting enzyme in the synthesis of serotonin. Normally, an increase in tryptophan availability results in an increase in serotonin synthesis. Therefore, ALA apart from improving mitochondrial function and preventing mitochondrial decay and oxidative damage has effect on serotonin synthesis that must be carefully considered in the treatment of depression. ALA co-administration with Crt did not show additive antidepressant-like effects.
MDA is a vital biomarker in preclinical and clinical studies., However, by different therapies applied in this study, important difference in the serum MDA level was not detected. MDA is a result of polyunsaturated fatty acids peroxidation; elevated levels of MDA have been known in individuals with depression disorder and in patients suffering from recurrent depressive disorders., The lack of difference may be related to pretreatment procedures, biological sample preparation, and storage. Another possible reason that a significant change in MDA was not observed could be the short treatment period. Perhaps, 6 days of IFNa injection, although induced behavioral depression-like changes in mice, was not enough to make significant change in MDA. It is suggested to evaluate the MDA level after long-term IFNa, Crt, and ALA administration and to use different assessment protocols.
In conclusion, improvement of behavioral parameters in mice treated with Crt and ALA indicates a clear effect of these two compounds in modulating mood and depressive behaviors. Crt and ALA prevented IFNa depressant-like behavioral effect; therefore, at least part of IFNa-induced depression may be related to mitochondrial dysfunction. Measuring serum MDA level did not show substantial biomedical differences. In addition, Crt and ALA inducing possible changes in the neurotransmitter system may also be involved in their antidepressant benefit effects. In general, although interpreting animal result to human should be vigilant, it can be concluded that Crt and ALA are reasonable alternative medications to prevent IFNa-induced depressive symptoms.
This work was financially supported through Grant No. 399045 by Isfahan University of Medical Sciences, Isfahan, Iran. The authors certify that no actual or potential conflict of interest in relation to this article exists.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3]