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Riboflavin and pyridoxine restore dopamine levels and reduce oxidative stress in brain of rats

BMC Neuroscience volume 19, Article number: 71 (2018) Cite this article

Abstract

Background

Neurological disorders suggest that the excitotoxicity involves a drastic increase in intracellular Ca2+ concentrations and the formation of reactive oxygen species. The presence of these free radicals may also affect the dopaminergic system. The aim of this work was to determine if riboflavin (B2) and pyridoxine (B6) provide protection to the brain against free radicals generated by 3-nitropropionic acid (3-NPA) by measuring the levels of dopamine (DA) and selected oxidative stress markers.

Methods

Male Fisher rats were grouped (n = 6) and treated as follows: group 1, control (NaCl 0.9%); group 2, 3-NPA (20 mg/kg); group 3, B2 (10 mg/kg); group 4, B2 (10 mg/kg) + 3-NPA (20 mg/kg); group 5, B6 (10 mg/kg) and group 6, B6 + 3-NPA. All treatments were administered every 24 h for 5 days by intraperitoneal route. After sacrifice, the brain was obtained to measure DA, GSH, and lipid peroxidation, Ca2+, Mg2+, ATPase and H2O2.

Main findings

Levels of dopamine increased in cortex, striatum and cerebellum/medulla oblongata of animals that received 3-NPA alone. The lipid peroxidation increased in cortex, striatum, and cerebellum/medulla oblongata, of animals treated with B2 vitamin alone. ATPase dependent on Ca+2, Mg+2 and H2O2 increased in all regions of animals that received 3-NPA alone.

Conclusion

The results confirm the capacity of 3-NPA to generate oxidative stress. Besides, the study suggests that B2 or B6 vitamins restored the levels of DA and reduced oxidative stress in brain of rats. We believe that these results would help in the study of neurodegenerative diseases.

Background

The main incident in neurological disorders is excitotoxicity which entails an extensive upsurge in the concentrations of intracellular Ca2+ and the production of reactive species such as ROS and RNS by lethal pathways [1]. In addition, there are alterations of the mitochondrial ultrastructure and DNA damage caused by nitric oxide- (NO-) dependent oxidative stress [2]. This damage is the primary event in 3-nitropropionic acid (3-NPA) toxicity.

In Wistar rats, it has been reported that 3-nitropropionic acid leads to neurodegeneration and that the intravenous administration in rats provides valuable insight of Huntington’s disease model [3]. There is evidence that metabolism of transmitter dopamine by monoamine oxidase enzyme may promote striatal damage in mitochondrial toxin induced models of Huntington’s disease (HD) [4], and that HD is a devastating neurodegenerative disorder that reflect neuronal dysfunction and ultimately death in selected brain regions with striatum and cerebral cortex being the principal targets [5]. Some nutrients are known to act as antioxidants; and although neglected as an antioxidant, riboflavin is one of such nutrients that independently or as a component of the glutathione redox cycle has an important antioxidant action [6]. On the other hand, pyridoxine alters serotonin metabolism [7]. Both compounds are water-soluble vitamins that possess antioxidant activity [8].

Neuromodulation activity of the NO- is a documented fact, however, an excess amount of it can produce oxidative damage or nitroso-glutathione (NOGSH) inside the cell, thus; causing the damage of the cell [9]. It is known that free radicals (FR) induce damage to the components of the cell [10]. Such FR-induced damage particularly affects the plasma membrane lipids [11]. In addition, the cells of the central nervous system are extremely susceptible to these unpaired electron molecular species. Nitric oxide (NO) acts on hypothalamic neurocircuits and on higher brain circuits, e.g. dopaminergic system to regulate energy and glucose homeostasis [12]. Therefore, the presence of FR may upset this regulatory function of NO. The structural proteins in the lipid bilayer are contiguous with brain plasma membrane phospholipids [13] and the ionic inflow and outflow through the lipid bilayer is maintained by Na+, K+ ATPase enzyme which stimulates Na+ and K+ flows [14]. It is know that when the activity of the enzyme Na+, K+ ATPase is inhibited, it triggers the release of excitatory amino acid in the CNS [15].

In view of all the aforementioned, the objective of the present work was to make a comparative analysis of the protective effects derivable from riboflavin (B2) and pyridoxine (B6) on 5-HIAA and dopamine levels, as well as on selected markers of oxidative stress in rats’ brain regions after an induction of Huntington’s disease (HD). Literature reports suggest that these substances may participate in the neutralization of excess free radicals in oxidation mechanisms. The production of free radicals, a usual biological phenomenon, is regulated by different metabolic routes, which constitute the first line of defence in the human body.

The aim of this work was to determine if riboflavin (B2) and pyridoxine (B6) provide protection to the brain against free radicals generated by 3-nitropropionic acid (3-NPA) by measuring the levels of dopamine (DA) and selected oxidative stress markers.

Materials and methods

Thirty-six male Wistar rats (250 g) were procured from Bioterium of Metropolitan University of Mexico City and housed in clean plastic cages, separated into 6 groups and treated as follows: group 1, control (NaCl 0.9%); group 2, 3-NPA (20 mg/kg); group 3, B2 (10 mg/kg); group 4, B2 (10 mg/kg) + 3-NPA (20 mg/kg); group 5, B6 (10 mg/kg); group 6, B6 (10 mg/kg) + 3-NPA (20 mg/kg), each group N = 6. The administration of treatments was by i.p. The animals received the drugs every 24 h during 3 days. At the end of the treatment period and 30 min after the last drug administration, the animals were sacrificed with guillotine without anaesthetic procedure. The animal brains were immediately extirpated and put in saline solution (NaCl 0.9%) at 4 °C. Tissues were immediately dissected in regions and used to evaluate reduced glutathione (GSH), H2O2, lipid peroxidation, ATPase, and the levels of DA and 5-hydroxyindolacetic acid (5-HIAA).

The rats or breeds employed in the study were subjected to a selection process based on phenotypic variety; genetic, environmental and compartmental factors. Longitudinal weight curves, weight and physical exploration were the means employed to select a breed for inclusion or exclusion in the study. Also, to select a breed, it is fundamental that inbreeding is non-existence, thus having a hereditary control of traits with continuous variation.

The selected animals were kept in cool and dry place at a temperature of 15–16 °C and with air filter and humidity of between 50 and 60. The place was maintained clean and was continuously sterilized to avoid bacterial and fungal growth.

The breeds were fed with standardized diet based on 3800 kcal/kg, proteins 12%, fat 5%, vitamins and minerals. The selected animals were 3 months old male Wistar of approximately 250 g weight.

Brain extraction

On sacrificing the animals, the brains were excised from the base. Then, the brain tissue was dissected in cortex, striatum and cerebellum/medulla oblongata, weighed and homogenised in 5 volumes of 0.05 M tris–HCl, pH 7.4. An aliquot of the homogenized brain tissue was obtained and again homogenised in 0.1 M perchloric acid (HClO4) (50:50 v/v) using Yamato homogenizer (Yamato lh-21 LSC Lab, Dallas, USA) and stored at − 20 °C until analysed.

Animal management and care was conducted in accordance to the international guidelines for animal care and to the Mexican Guidelines ZOO-062. Besides, the study was approved by the Laboratory Animals Use and Care Committee of National Institute of Pediatrics.

Measurement of Dopamine (DA)

The DA levels were measured in the supernatant of tissue homogenized in HClO4 after centrifugation at 5000g for 10 min in a microcentrifuge (Hettich Zentrifugen, model Mikro 12-42, Tuttlingen, Germany), with a version of the technique reported by Calderon et al. [16]. An aliquot of the HClO4 supernatant, and 1.9 mL of buffer (0.003 M octyl-sulphate, 0.035 M KH2PO4, 0.03 M citric acid, 0.001 M ascorbic acid), were placed in a test tube. The mixture was incubated for 5 min at room temperature in total darkness, and subsequently, the samples were read in a spectrofluorometer (Perkin Elmer LS 55, Buckinghamshire, England) with 282 nm excitation and 315 nm emission lengths. The FL Win Lab version 4.00.02 software was used. Values were inferred in a previously standardized curve and reported as nMoles/g of wet tissue.

Measurement of 5-HIAA

5-HIAA levels were measured in the supernatant of tissue homogenized in HClO4 after centrifugation at 5000g for 10 min in a microcentrifuge (Hettich Zentrifugen), with a modified version of the technique reported by Beck et al. [17]. An aliquot of the HClO4 supernatant, and 1.9 mL of acetate buffer 0.01 M pH 5.5 were placed in a test tube. The mixture was incubated for 5 min at room temperature in total darkness, and subsequently, the samples were read in a spectrofluorometer (Perkin Elmer LS 55) with 296 nm excitation and 333 nm emission lengths. The FL Win Lab version 4.00.02 software was used. Values were inferred in a previously standardized curve and reported as nMoles/g of wet tissue.

Measurement of reduced glutathione (GSH)

GSH levels were measured from the supernatant of the perchloric acid homogenised tissue, obtained after centrifuging at 5000g for 5 min (Hettich Zentrifugen) according to a modified method of Hissin and Hilf [18]. A 1.8 mL phosphate buffer pH 8.0 with EDTA 0.2% plus a 20 μL aliquot of the supernatant and 100 mL of ortho-phthaldehyde (OPT) 1 mg/mL in methanol were put in a test tube and mixed. The mixture was then incubated for 15 min at room temperature in absolute darkness. At the end of the incubation time, the samples were read in a spectrophotometer (Perkin Elmer LS 55), with excitation and emission wavelengths of 350 and 420, respectively. FL Win Lab version 4.00.02 software was used. Values were inferred from a previously standardised curve and expressed as nM/g.

Measurement of lipid peroxidation

The lipid peroxidation across the reactive substances to the thiobarbituric acid (Tbars) determination was carried out using the modified technique of Gutteridge and Halliwell [11], as described below: From the homogenized brain in tris–HCl 0.05 M pH 7.4, 1 mL was taken and to it was added 2 mL of thiobarbituric acid (Tba) containing 1.25 g of Tba, 40 g of trichloroacetic acid (Tca), and 6.25 mL of concentrated chlorhydric acid (HCl) diluted in 250 mL of deionized H2O. The mixture was heated to boiling point for 30 min. (Thermomix 1420) and then cooled in an ice bath for 5 min. after which it was centrifuged at 700g for 15 min. (Sorvall RC-5B Dupont). The absorbance of the floating tissues was read in triplicate at 532 nm in a spectrophotometer (Helios de UNICAM). The concentration of TBARS was expressed in µM of Malondialdehyde/g of wet tissue.

Measurement of total ATPase

The activity of ATPase was assayed according to the method proposed by Calderón et al. [19]. 1 mg (10%) w/v of homogenised brain and heart tissues in tris–HCl 0.05 M pH 7.4 was incubated for 15 min in a solution containing 3 mM MgCl2, 7 mM KCl, and 100 mM NaCl. To this was added 4 mM tris-ATP and incubated for another 30 min at 37 °C in a shaking water bath (Dubnoff Labconco, TX, USA). 100 µL trichloroacetic acid at 10% w/v was used to stop the reaction and the samples were centrifuged at 100g for 5 min at 4 °C. Inorganic phosphate (Pi) was measured in triplicates using one supernatant aliquot as proposed by Fiske and Subarrow [20]. Supernatant absorbance was read at 660 nm in a Helios-α, UNICAM spectrophotometer and expressed as mM Pi/g wet tissue per minute.

Measurement of H2O2

The determination of H2O2 was made using the modified technique of Asru [21]. Each brain region (cortex, striatum, cerebellum/medulla oblongata) was homogenized in 3 mL of tris–HCl 0.05 M pH 7.4 buffers. From the diluted homogenates, 100 µL was taken and mixed with 1 mL of potassium dichromate solution (K2Cr2O7). The mixtures were heat to boiling point for 15 min (Thermomix 1420, CA, USA). The samples were later placed in an ice bath for 5 min and centrifuged at 3000g for 5 min (Hettich Zentrifugen). The absorbance of the floating was read in triplicate at 570 nm in a spectrophotometer (Heλios-α of UNICAM, Bristol, UK). The concentration of H2O2 was expressed in µMoles.

Statistical analysis

One way analysis of variance (ANOVA) or Non parametric Kruskal–Wallis test was used after the data have been subjected to variances homogeneity test. Post hoc Tukey–Kramer or Steel–Dwass contrast was employed. The values of p < 0.05 were considered statistically significant [22]. JMP Statistical Discovery Software version 10.0 from SAS was used.

Results

In cortex, the administration of 3-NPA produced a significant increase in the levels of dopamine as well as a significant decrease in the levels of 5-HIAA (Fig. 1). GSH decreased in all animals groups that received the treatments however, the decrease of GSH had statistical significant difference only in those treated with Rivoflavin (B2), Rivoflavin (B2) + 3-NPA and Pyridoxine (B6) + 3-NPA when compared with the control group (Fig. 2). Significant lipid peroxidation was appreciated in animals treated with Rivoflavin in comparison with control, B2 + 3-NPA and B6 + 3-NPA groups (Fig. 3). Calcium Magnesium dependent ATPase activity increased significantly in the group of animals that received 3-NPA when compared with other treatments (Fig. 4). In this region, the changes in H2O2 levels did not have statistical differences among treated and control groups (Fig. 5).

Fig. 1
figure1

5-HIAA levels in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 11.06; p < 0.0001; *p < 0.0004 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. Striatum: Anova F = 10.3; p < 0.0001; *p < 0.006 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. Cerebellum/medulla oblongata: Anova F = 4.9; p = 0.002; *p < 0.02 3-NPA versus control and B6 + 3-NPA

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Fig. 2
figure2

GSH levels in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 3.97; p = 0.008; *p < 0.05 control versus 3-NPA, B2 + 3-NPA, B6 + 3-NPA. Striatum: Anova F = 0.02; p = 0.95. Cerebellum/medulla oblongata: Anova F = 1.8; p < 0.13

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Fig. 3
figure3

TBARS levels in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 4.60; p = 0.003; *p < 0.05 B2 versus control, B2 + 3-NPA, B6 + 3-NPA. Striatum: Anova F = 21.5; p < 0.0001; *p < 0.0001 B2 versus control, 3-NPA, B2 + 3-NPA, B6, B6 + 3-NPA. Cerebellum/medulla oblongata: Anova F = 5.21; p = 0.002; *p < 0.05 B2 versus control, 3-NPA, B2 + 3-NPA, B6

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Fig. 4
figure4

Ca2+, Mg2+ATPase activity in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 36.8; p < 0.0001; *p < 0.001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. Striatum: Anova F = 65.01; p < 0.0001; *p < 0.0001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. Cerebellum/medulla oblongata: Anova F = 134.3; p < 0.0001; *p < 0.0001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA

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Fig. 5
figure5

H2O2 levels in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 2.15; p = 0.08. Striatum: Kruskal–Wallis X2 = 4.4; p = 0.4. Cerebellum/medulla oblongata: Anova F = 19.9; p < 0.0001; *p < 0.0001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. **p = 0.03 B2 versus B2 + 3-NPA

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In striatum similar results as those observed in cortex were found. 3-NPA decreased 5-HIAA concentration (Fig. 1). Rivoflavin administration produced an increase in lipid peroxidation and 3-NPA treated animals showed significant increase in ATPase activity (Fig. 4).

In the cerebellum/Medulla oblongata of the animals that received 3-NPA alone, Dopamine, H2O2 and ATPase activity increased while 5-HIAA levels were found to. In this region significant lipid peroxidation increment was observed in Rivoflavin treated group when compared with the rest of the treated animals decrease (Figs. 1, 4, 5, 6).

Fig. 6
figure6

Dopamine levels in brain of rats treated with NaCl (G1), 3-Nitropropionic acid 3-NPA (G2), Riboflavin B2 (G3), Riboflavin B2 + 3-NPA (G4), Pyridoxine B6 (G5) and Pyridoxine B6 + 3-NPA (G6). Data presented as Mean ± SD values of percentage with respect to NaCl control group. Assays were made by triplicate. Cortex: Anova F = 41.3; p < 0.0001; *p < 0.0001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA. Striatum: Kruskal–Wallis X2 = 11.6; p = 0.04 (No comparisons were made due 3-NPA data dispersion). Cerebellum/medulla oblongata: Anova F = 18.1; p < 0.0001 3-NPA versus control, B2, B2 + 3-NPA, B6, B6 + 3-NPA

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Discussion

Evidence has shown that Huntington’s disease (HD) can be caused by mitochondrial toxin produced as a result of striatal damaged that is provoked when the transmitter dopamine is metabolized by monoamine oxidase enzymes [4]. Also, HD is a destructive neurodegenerative disorder and indicates dysfunction in the neurons that may eventually lead to death of selected brain regions; especially, the striatum and cerebral cortex [5]. In recent studies, the dendritic spine density of striatal projection neurons was reported to be seriously decreased after 3-nitropropionic acid treatment [23]. This finding is in conformity with the results of the present study where dopamine levels increased in cortex, striatum and cerebellum/medulla oblongata regions of animals that received 3-nitropropionic acid treatment. Moreover, it is possible that the increase in dopamine turnover produces an increase in oxygen radical by monoamine oxidase activity.

H2O2 concentration increased in cerebellum/medulla oblongata regions in animals treated with 3-NPA. This demonstrates that reactive oxygen species is the primary event in 3-NPA toxicity. In the same brain regions, lipid peroxidation increased in animals treated with riboflavin. Such increase may be due to the association of this substance with increased mitochondrial energy metabolism that is probably responsible for the high rate of oxidative metabolic activity in the brain which gives rise to intense production of reactive oxygen metabolite and subsequently to the generation of free radicals implicated in the pathogenesis of neurological disorders. These results may have relation with the reports of Kumar et al. [24] and Kaur et al. [25], which suggest that 3-NPA depleted GSH in cortex, although the present study was made with young animal models.

Calcium and magnesium-dependent ATPase activity increased in cortex, striatum and cerebellum/medulla oblongata regions of the animals that received 3-NPA alone. This could be attributed to changes in the affinity of the enzyme [26]. These results may have relation with the reports of Naziroğlu et al. [27], which suggest that increase in Ca2+-ATPase activities may have protective effects against substances that induce brain injury by inhibiting free radical production, regulating calcium-dependent processes and supporting the antioxidant redox system.

Conclusion

The results of the present study suggest that the partial increase in antioxidant capacity in brain due to B2 and B6 vitamins promotes an effect in dopamine or serotonin metabolisms when we consider 3-NPA capacity to generate oxidative stress.

We recommend that further studies be carried out to investigate the possible relationship between B2 and B6 vitamins on dopamine and serotonin levels in different animal models. Undoubtedly, we believe that this would help in the study of neurodegenerative diseases.

Abbreviations

AO:

antioxidant

CNS:

central nervous system

DA:

dopamine

DNA:

deoxyribonucleic acid

EAA:

excitatory amino acids

FR:

free radicals

GSH:

glutathione

HD:

Huntington’s disease

5-HIAA:

5-hydroxyindole-acetic acid

NOGSH:

nitroso-glutathione

3-NPA:

3-nitropropionic acid

l-DOPA:

l-3,4-dihydroxyphenylalanine

OPT:

ortho-phthaldehyde

RNS:

reactive nitrogen species

ROS:

reactive oxygen species

Tbars.:

thiobarbituric acid reactive substances

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Authors’ contributions

AVP: contributed in the conception and design, critically revised the manuscript for important intellectual content, drafted manuscript. DCG: Contributed in the acquisition, analysis and interpretation of data, critically revised the manuscript for important intellectual content, drafted manuscript. NOB, MOH, BJT, GBM: Contributed in the acquisition, analysis and interpretation of data, drafted manuscript. HJO, MLS: Critically revised the manuscript for important intellectual content, drafted manuscript. All authors read and approved the final manuscript.

Acknowledgements

We thank Dr. Cyril Ndidi Nwoye, a native English speaker and language professor, for the critical review and translation of this manuscript.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

The data sets used and/or analyzed in the present study are available from the corresponding author only on reasonable request.

Consent for publication

Not applicable.

Ethics approval and consent

Animal management and care was conducted in accordance to the international guidelines for animal care and to the Mexican Guidelines ZOO-062. Besides, the study was approved by the Laboratory Animals Use and Care Committee of National Institute of Pediatrics.

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This manuscript was not funded by any organization.

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Affiliations

  1. Laboratorio de Neurociencias, Instituto Nacional de Pediatría (INP), Mexico City, Mexico
    • Armando Valenzuela Peraza
    • , David Calderón Guzmán
    • , Norma Osnaya Brizuela
    •  & Gerardo Barragán Mejía
  2. Laboratorio de Bacteriología Experimental, INP, Mexico City, Mexico
    • Maribel Ortiz Herrera
  3. Laboratorio de Farmacología, Instituto Nacional de Pediatría (INP), y Facultad de Medicina, Universidad Nacional Autónoma de México, Av Imán #1, 3er piso, Col Cuicuilco, CP 04530, Mexico City, Mexico
    • Hugo Juárez Olguín
    • , Miroslava Lindoro Silva
    •  & Belén Juárez Tapia
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  1. Armando Valenzuela Peraza
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Correspondence to Hugo Juárez Olguín.

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Peraza, A.V., Guzmán, D.C., Brizuela, N.O. et al. Riboflavin and pyridoxine restore dopamine levels and reduce oxidative stress in brain of rats. BMC Neurosci 19, 71 (2018). https://doi.org/10.1186/s12868-018-0474-4

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Keywords

  • Brain
  • Huntington animal model
  • Oxidative stress
  • Riboflavin
  • Pyridoxine

BMC Neuroscience

ISSN: 1471-2202

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