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MHC I expression and synaptic plasticity in different mice strains after axotomy
Author(s) -
Sabha Mario,
Emirandetti Amanda,
Cullheim Staffan,
De Oliveira Alexandre Leite Rodrigues
Publication year - 2008
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/syn.20475
Subject(s) - axotomy , lesion , neuroscience , spinal cord , biology , regeneration (biology) , downregulation and upregulation , microbiology and biotechnology , anatomy , pathology , medicine , genetics , gene
The success of axonal regeneration has been attributed to a co‐operation between the severed neurons and the surrounding environment, including non‐neuronal cells and the extracellular matrix. Important differences regarding the regeneration potential after injury have been described among inbred mice strains. To date, there is only limited knowledge of how such variation can be linked with the genetic background. It has recently been demonstrated that MHC class I molecules have an influence on the spinal cord synaptic plasticity elicited by a peripheral lesion, and the regenerative capacity following such a lesion. Therefore, in the present work we compared the MHC I expression after axotomy in three isogenic mice strains, namely C57BL/6J, Balb/cJ, and A/J, and investigated the fine ultrastructure of the synaptic elimination process that follows such lesion. The results show that C57BL/6J mice, that have a comparatively poor regenerative potential, display a lower upregulation of MHC I in the spinal cord, coupled with a slower synaptic stripping. On the other hand, A/J mice, which have been shown to have a stronger axonal regrowth potential, showed a clear upregulation of MHC I and a sharp acute loss of afferents, at 1 week after lesion. Our results suggest that a more prominent expression of MHC I in the first week after lesion may positively influence the regenerative outcome associated with a more effective axonal regrowth. Synapse 62:137–148, 2008. © 2007 Wiley‐Liss, Inc.