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Published in: NeuroMolecular Medicine 2/2020

01-06-2020 | Original Paper

Harpagophytum procumbens Extract Ameliorates Allodynia and Modulates Oxidative and Antioxidant Stress Pathways in a Rat Model of Spinal Cord Injury

Authors: Garrett Ungerer, Jiankun Cui, Tina Ndam, Mikeala Bekemeier, Hailong Song, Runting Li, Heather R. Siedhoff, Bo Yang, Michael K. Appenteng, C. Michael Greenlief, Dennis K. Miller, Grace Y. Sun, William R. Folk, Zezong Gu

Published in: NeuroMolecular Medicine | Issue 2/2020

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Abstract

Spinal cord injury (SCI) is a deliberating disorder with impairments in locomotor deficits and incapacitating sensory abnormalities. Harpagophytum procumbens (Hp) is a botanical widely used for treating inflammation and pain related to various inflammatory and musculoskeletal conditions. Using a modified rodent contusion model of SCI, we explored the effects of this botanical on locomotor function and responses to mechanical stimuli, and examined possible neurochemical changes associated with SCI-induced allodynia. Following spinal cord contusion at T10 level, Hp (300 mg/kg, p.o.) or vehicle (water) was administered daily starting 24 h post-surgery, and behavioral measurements made every-other day until sacrifice (Day 21). Hp treatment markedly ameliorated the contusion-induced decrease in locomotor function and increased sensitivity to mechanical stimuli. Determination of Iba1 expression in spinal cord tissues indicated microglial infiltration starting 3 days post-injury. SCI results in increased levels of 4-hydroxynonenal, an oxidative stress product and proalgesic, which was diminished at 7 days by treatment with Hp. SCI also enhanced antioxidant heme oxygenase-1 (HO-1) expression. Concurrent studies of cultured murine BV-2 microglial cells revealed that Hp suppressed oxidative/nitrosative stress and inflammatory responses, including production of nitric oxide and reactive oxygen species, phosphorylation of cytosolic phospholipases A2, and upregulation of the antioxidative stress pathway involving the nuclear factor erythroid 2-related factor 2 and HO-1. These results support the use of Hp for management of allodynia by providing resilience against the neuroinflammation and pain associated with SCI and other neuropathological conditions.
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Metadata
Title
Harpagophytum procumbens Extract Ameliorates Allodynia and Modulates Oxidative and Antioxidant Stress Pathways in a Rat Model of Spinal Cord Injury
Authors
Garrett Ungerer
Jiankun Cui
Tina Ndam
Mikeala Bekemeier
Hailong Song
Runting Li
Heather R. Siedhoff
Bo Yang
Michael K. Appenteng
C. Michael Greenlief
Dennis K. Miller
Grace Y. Sun
William R. Folk
Zezong Gu
Publication date
01-06-2020
Publisher
Springer US
Published in
NeuroMolecular Medicine / Issue 2/2020
Print ISSN: 1535-1084
Electronic ISSN: 1559-1174
DOI
https://doi.org/10.1007/s12017-019-08585-z

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