期刊
PAIN
卷 156, 期 11, 页码 2295-2309出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/j.pain.0000000000000280
关键词
Contra lateral pain; Spinal nerve ligation; Mechanical hypersensitivity; Dorsal root ganglion; Nociceptor excitability; Neurite sprouting
资金
- Ministry of Science and Technology [MOST 104-2320-B-010-010-MY3, MOST 103-2321-B-010-012, MOST 103-2811-B-010-050]
- Mackay Memorial Hospital and National Yang-Ming University Joint Research [MMH-YM-10201, MMH-YM-10301, MMH104-099]
- Brain Research Center of National Yang-Ming University
- Ministry of Education
Elevated nerve growth factor (NGF) in the contralateral dorsal root ganglion (DRG) mediates mirror-image pain after peripheral nerve injury, but the underlying mechanism remains unclear. Using intrathecal injection of NGF antibodies, we found that NGF is required for the development of intra-DRG synapse-like structures made by neurite sprouts of calcitonin gene-related peptide (CGRP(+)) nociceptors and sympathetic axons onto neurite sprouts of Kv4.3(+) nociceptors. These synapse-like structures are formed near NGF-releasing satellite glia surrounding large DRG neurons. Downregulation of the postsynaptic protein PSD95 with a specific shRNA largely eliminates these synapse-like structures, suppresses activities of Kv4.3(+) but not CGRP(+) nociceptors, and attenuates mirror-image pain. Furthermore, neutralizing the neurotransmitter norepinephrine or CGRP in the synapse-like structures by antibodies has similar analgesic effect. Thus, elevated NGF after peripheral nerve injury induces neurite sprouting and the formation of synapse-like structures within the contralateral DRG, leading to the development of chronic mirror-image pain.
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