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Selective Activation of Microglia in Spinal Cord but Not Higher Cortical Regions Following Nerve Injury in Adult Mouse

Zhang, Fuxing, Vadakkan, Kujumon I, Kim, Susan S, Wu, Long-Jun, Shang, Yuze, Zhuo, Min·2008·Molecular Pain
DOI 10.1186/1744-8069-4-15PMC PMC2374773
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Abstract

Neuronal plasticity along the pathway for sensory transmission including the spinal cord and cortex plays an important role in chronic pain, including inflammatory and neuropathic pain. While recent studies indicate that microglia in the spinal cord are involved in neuropathic pain, a systematic study has not been performed in other regions of the central nervous system (CNS). In the present study, we used heterozygous Cx3cr1 GFP+ mice to characterize the morphological phenotypes of microglia following common peroneal nerve (CPN) ligation. We found that microglia showed a uniform distribution throughout the CNS, and peripheral nerve injury selectively activated microglia in the spinal cord dorsal horn and related ventral horn. In contrast, microglia was not activated in supraspinal regions of the CNS, including the anterior cingulate cortex (ACC), prefrontal cortex (PFC), primary and secondary somatosensory cortex (S1 and S2), insular cortex (IC), amygdala, hippocampus, periaqueductal gray (PAG) and rostral ventromedial medulla (RVM). Our results provide strong evidence that nerve injury primarily activates microglia in the spinal cord of adult mice, and pain-related cortical plasticity is likely mediated by neurons.

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Cited by

Sorted by citations

Authors
Zhang, F., Vadakkan, K. I., Kim, S. S., Wu, L.-J., Shang, Y., & Zhuo, M.
Venue
Molecular Pain
Publisher
SAGE Publications
Published
2008-01-01
Volume
4
ISSN
1744-8069
DOI
10.1186/1744-8069-4-15
PMC
PMC2374773
Cited by
97
References
5
Language
en
Licence
journals.sagepub.com/page/policies/text-and-data-mining-license (tdm)

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