1. Bergenin Reduces Experimental Painful Diabetic Neuropathy by Restoring Redox and Immune Homeostasis in the Nervous System
- Author
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Jorge Mauricio David, Clayton Q. Alves, Kelly Barbosa Gama, Cristiane Flora Villarreal, Renan Fernandes do Espírito-Santo, Dourivaldo Silva Santos, Milena Botelho Pereira Soares, Pedro Santana Sales Lauria, and Paulo José Lima Juiz
- Subjects
Male ,Nervous system ,natural product ,Diabetic neuropathy ,antioxidant ,Anti-Inflammatory Agents ,Nitric Oxide Synthase Type II ,sciatic nerve ,Pharmacology ,medicine.disease_cause ,immunomodulation ,Nervous System ,Antioxidants ,lcsh:Chemistry ,Mice ,chemistry.chemical_compound ,Diabetic Neuropathies ,Malondialdehyde ,cytokine ,Homeostasis ,lcsh:QH301-705.5 ,Spectroscopy ,chemistry.chemical_classification ,biology ,Glutathione peroxidase ,Bergenin ,General Medicine ,analgesic ,diabetic neuropathy ,Computer Science Applications ,Nitric oxide synthase ,medicine.anatomical_structure ,Neuropathic pain ,Cytokines ,Oxidation-Reduction ,NF-E2-Related Factor 2 ,Nitric Oxide ,Streptozocin ,Article ,Catalysis ,Diabetes Mellitus, Experimental ,Nitric oxide ,Inorganic Chemistry ,medicine ,Animals ,Benzopyrans ,Physical and Theoretical Chemistry ,Molecular Biology ,neuropathic pain ,Glutathione Peroxidase ,business.industry ,Organic Chemistry ,spinal cord ,medicine.disease ,Mice, Inbred C57BL ,Oxidative Stress ,lcsh:Biology (General) ,lcsh:QD1-999 ,chemistry ,Immune System ,biology.protein ,Neuralgia ,business ,Oxidative stress - Abstract
Diabetic neuropathy is a frequent complication of diabetes. Symptoms include neuropathic pain and sensory alterations&mdash, no effective treatments are currently available. This work characterized the therapeutic effect of bergenin in a mouse (C57/BL6) model of streptozotocin-induced painful diabetic neuropathy. Nociceptive thresholds were assessed by the von Frey test. Cytokines, antioxidant genes, and oxidative stress markers were measured in nervous tissues by ELISA, RT-qPCR, and biochemical analyses. Single (3.125&ndash, 25 mg/kg) or multiple (25 mg/kg, twice a day for 14 days) treatments with bergenin reduced the behavioral signs of diabetic neuropathy in mice. Bergenin reduced both nitric oxide (NO) production in vitro and malondialdehyde (MDA)/nitrite amounts in vivo. These antioxidant properties can be attributed to the modulation of gene expression by the downregulation of inducible nitric oxide synthase (iNOS) and upregulation of glutathione peroxidase and Nrf2 in the nervous system. Bergenin also modulated the pro- and anti-inflammatory cytokines production in neuropathic mice. The long-lasting antinociceptive effect induced by bergenin in neuropathic mice, was associated with a shift of the cytokine balance toward anti-inflammatory predominance and upregulation of antioxidant pathways, favoring the reestablishment of redox and immune homeostasis in the nervous system. These results point to the therapeutic potential of bergenin in the treatment of painful diabetic neuropathy.
- Published
- 2020
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