Role of Exercise Activity in Alleviating Neuropathic Pain in Diabetes via Inhibition of the Pro-Inflammatory Signal Pathway

Abstract

Hyperalgesia and allodynia are commonly observed in patients with diabetic neuropathy. The treatment and management of painful peripheral neuropathy is important in these patients. The purpose of this study was to examine the role of exercise in modulating neuropathic pain induced by diabetes. Diabetes was induced in rats by an intraperitoneal injection of streptozotocin (STZ). Control rats received saline injections. Groups included control rats without exercise (NT-control, n = 12), control rats with exercise (EX-control, n = 16), STZ rats without exercise (NT-STZ, n = 18), and STZ rats with exercise (EX-STZ, n = 22). Rats in EX groups ran on a treadmill 4 days/week for 5 weeks beginning from the week of STZ administration. Mechanical hypersensitivity (mechanical paw withdrawal thresholds [PWTs]) and glucose levels were tested weekly. Then, enzyme-linked immunoassay and Western blot analysis were used to determine the levels of pro-inflammatory cytokines (PICs) and their receptors in sensory nerves. PWTs were significantly increased after 4–5 weeks of exercise in STZ rats (p < .05 vs. NT-STZ rats). Inhibition of neuropathic pain by exercise in STZ rats was accompanied by decreases in interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α levels and downregulated expression of their receptors. Furthermore, blocking individual PIC receptors elevated PWTs to a greater degree in STZ rats (p < .05 vs. control rats). Overall, our data suggest that exercise can play a role in improving neuropathic pain induced by STZ and that PIC signaling is a part of the mechanism involved in this effect.

Keywords

exercise diabetes cytokines neuropathic pain peripheral nerve

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