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2015 ; 19
(5
): 621-8
Nephropedia Template TP
gab.com Text
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English Wikipedia
Mild closed head injury promotes a selective trigeminal hypernociception:
implications for the acute emergence of post-traumatic headache
#MMPMID25168788
Benromano T
; Defrin R
; Ahn AH
; Zhao J
; Pick CG
; Levy D
Eur J Pain
2015[May]; 19
(5
): 621-8
PMID25168788
show ga
BACKGROUND: Headache is one of the most common symptoms following traumatic head
injury. The mechanisms underlying the emergence of such post-traumatic headache
(PTH) remain unknown but may be related to injury of deep cranial tissues or
damage to central pain processing pathways, as a result of brain injury. METHODS:
A mild closed head injury in mice combined with the administration of cranial or
hindpaw formalin tests was used to examine post-traumatic changes in the
nociceptive processing from deep cranial tissues or the hindpaw. Histological
analysis was used to examine post-traumatic pro-inflammatory changes in the
calvarial periosteum, a deep cranial tissue. RESULTS: At 48?h after head injury,
mice demonstrated enhanced nociceptive responses following injection of formalin
into the calvarial periosteum, a deep cranial tissue, but no facilitation of the
nociceptive responses following injection of formalin into an extracranial
tissue, the hindpaw. Mice also showed an increase in the number of activated
periosteal mast cells 48?h following mild head trauma, suggesting an inflammatory
response. CONCLUSION: Our study demonstrates that mild closed head injury is
associated with enhanced processing of nociceptive information emanating from
trigeminal-innervated deep cranial tissues, but not from non-cranial tissues.
Based on these finding as well as the demonstration of head injury-evoked
degranulation of calvarial periosteal mast cells, we propose that
inflammatory-evoked enhancement of peripheral cranial nociception, rather than
changes in supraspinal pain mechanisms play a role in the initial emergence of
PTH. Peripheral targeting of nociceptors that innervate the calvaria may be used
to ameliorate PTH pain.