Acrolein involvement in sensory and behavioral hypersensitivity following spinal cord injury in the rat

Journal of Neurochemistry - Tập 128 Số 5 - Trang 776-786 - 2014
Michael R. Due1, Jonghyuck Park2, Lingxing Zheng2, Michael Walls2, Yohance M. Allette3, Fletcher A. White1,3, Riyi Shi1,2
1Department of Anesthesia Indiana University School of Medicine West Lafayette IN USA
2Department of Basic Medical Sciences College of Veterinary Medicine and Weldon School of Biomedical Engineering Purdue University West Lafayette IN USA
3Department of Cell Biology and Anatomy Indiana University School of Medicine Indianapolis IN USA

Tóm tắt

AbstractGrowing evidence suggests that oxidative stress, as associated with spinal cord injury (SCI), may play a critical role in both neuroinflammation and neuropathic pain conditions. The production of the endogenous aldehyde acrolein, following lipid peroxidation during the inflammatory response, may contribute to peripheral sensitization and hyperreflexia following SCI via the TRPA1‐dependent mechanism. Here, we report that there are enhanced levels of acrolein and increased neuronal sensitivity to the aldehyde for at least 14 days after SCI. Concurrent with injury‐induced increases in acrolein concentration is an increased expression of TRPA1 in the lumbar (L3–L6) sensory ganglia. As proof of the potential pronociceptive role for acrolein, intrathecal injections of acrolein revealed enhanced sensitivity to both tactile and thermal stimuli for up to 10 days, supporting the compound's pro‐nociceptive functionality. Treatment of SCI animals with the acrolein scavenger hydralazine produced moderate improvement in tactile responses as well as robust changes in thermal sensitivity for up to 49 days. Taken together, these data suggest that acrolein directly modulates SCI‐associated pain behavior, making it a novel therapeutic target for preclinical and clinical SCI as an analgesic. image Following spinal cord injury (SCI), acrolein involvement in neuropathic pain is likely through direct activation and elevated levels of pro‐nociceptive channel TRPA1. While acrolein elevation correlates with neuropathic pain, suppression of this aldehyde by hydralazine leads to an analgesic effect. Acrolein may serve as a novel therapeutic target for preclinical and clinical SCI to relieve both acute and chronic post‐SCI neuropathic pain.

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Journal of Neurochemistry

Tập 128 Số 5

776-786

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