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2016 ; 3
(6
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Cortical Spreading Depression Promotes Persistent Mechanical Sensitization of
Intracranial Meningeal Afferents: Implications for the Intracranial
Mechanosensitivity of Migraine
#MMPMID28127585
Zhao J
; Levy D
eNeuro
2016[Nov]; 3
(6
): ä PMID28127585
show ga
Migraine is one of the most common and disabling diseases in the world. A major
feature of migraine headache is its aggravation by maneuvers that momentarily
increase intracranial pressure. A key hypothesis implicates mechanical
sensitization of trigeminal afferents that innervate the intracranial meninges in
mediating this feature of migraine. However, whether such pain-related neural
response actually develops under endogenous conditions that are linked
specifically to migraine remains to be established. Single-unit recordings in the
trigeminal ganglion of anesthetized male rats were combined with quantitative
mechanical stimulation of the cranial dura mater to determine whether cortical
spreading depression (CSD), an endogenous migraine-triggering event, affects the
mechanosensitivity of meningeal afferents. CSD gave rise to an almost threefold
increase in the magnitude of the responses to mechanical stimuli in 17 of 23 of
the afferents tested. CSD-evoked meningeal afferent mechanosensitization occurred
with a delay of 23.1 ± 2.2 min and lasted 64.1 ± 6.8 min in recording sessions
that lasted for 90 min and for 177.5 ± 22.1 min in recording sessions that were
extended for 240 min. Some of the sensitized afferents also developed a
shorter-lasting increase in their ongoing discharge rate that was not correlated
with the increase in their mechanosensitivity, suggesting that CSD-evoked
meningeal afferent sensitization and increase in ongoing activity are independent
phenomena. These novel findings support the notion that mechanical sensitization
of meningeal afferents serves as a key nociceptive process that underlies the
worsening of migraine headache during conditions that momentarily increase
intracranial pressure.