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2015 ; 10
(11
): e0142740
Nephropedia Template TP
gab.com Text
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English Wikipedia
Elucidating the Role of Injury-Induced Electric Fields (EFs) in Regulating the
Astrocytic Response to Injury in the Mammalian Central Nervous System
#MMPMID26562295
Baer ML
; Henderson SC
; Colello RJ
PLoS One
2015[]; 10
(11
): e0142740
PMID26562295
show ga
Injury to the vertebrate central nervous system (CNS) induces astrocytes to
change their morphology, to increase their rate of proliferation, and to display
directional migration to the injury site, all to facilitate repair. These
astrocytic responses to injury occur in a clear temporal sequence and, by their
intensity and duration, can have both beneficial and detrimental effects on the
repair of damaged CNS tissue. Studies on highly regenerative tissues in
non-mammalian vertebrates have demonstrated that the intensity of direct-current
extracellular electric fields (EFs) at the injury site, which are 50-100 fold
greater than in uninjured tissue, represent a potent signal to drive tissue
repair. In contrast, a 10-fold EF increase has been measured in many injured
mammalian tissues where limited regeneration occurs. As the astrocytic response
to CNS injury is crucial to the reparative outcome, we exposed purified rat
cortical astrocytes to EF intensities associated with intact and injured
mammalian tissues, as well as to those EF intensities measured in regenerating
non-mammalian vertebrate tissues, to determine whether EFs may contribute to the
astrocytic injury response. Astrocytes exposed to EF intensities associated with
uninjured tissue showed little change in their cellular behavior. However,
astrocytes exposed to EF intensities associated with injured tissue showed a
dramatic increase in migration and proliferation. At EF intensities associated
with regenerating non-mammalian vertebrate tissues, these cellular responses were
even more robust and included morphological changes consistent with a
regenerative phenotype. These findings suggest that endogenous EFs may be a
crucial signal for regulating the astrocytic response to injury and that their
manipulation may be a novel target for facilitating CNS repair.