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2016 ; 157
(9
): 2124-2140
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Sustained relief of ongoing experimental neuropathic pain by a CRMP2 peptide
aptamer with low abuse potential
#MMPMID27537210
Xie JY
; Chew LA
; Yang X
; Wang Y
; Qu C
; Wang Y
; Federici LM
; Fitz SD
; Ripsch MS
; Due MR
; Moutal A
; Khanna M
; White FA
; Vanderah TW
; Johnson PL
; Porreca F
; Khanna R
Pain
2016[Sep]; 157
(9
): 2124-2140
PMID27537210
show ga
Uncoupling the protein-protein interaction between collapsin response mediator
protein 2 (CRMP2) and N-type voltage-gated calcium channel (CaV2.2) with an
allosteric CRMP2-derived peptide (CBD3) is antinociceptive in rodent models of
inflammatory and neuropathic pain. We investigated the efficacy, duration of
action, abuse potential, and neurobehavioral toxicity of an improved mutant CRMP2
peptide. A homopolyarginine (R9)-conjugated CBD3-A6K (R9-CBD3-A6K) peptide
inhibited the CaV2.2-CRMP2 interaction in a concentration-dependent fashion and
diminished surface expression of CaV2.2 and depolarization-evoked Ca influx in
rat dorsal root ganglia neurons. In vitro studies demonstrated suppression of
excitability of small-to-medium diameter dorsal root ganglion and inhibition of
subtypes of voltage-gated Ca channels. Sprague-Dawley rats with tibial nerve
injury had profound and long-lasting tactile allodynia and ongoing pain.
Immediate administration of R9-CBD3-A6K produced enhanced dopamine release from
the nucleus accumbens shell selectively in injured animals, consistent with
relief of ongoing pain. R9-CBD3-A6K, when administered repeatedly into the
central nervous system ventricles of naive rats, did not result in a positive
conditioned place preference demonstrating a lack of abusive liability.
Continuous subcutaneous infusion of R9-CBD3-A6K over a 24- to 72-hour period
reversed tactile allodynia and ongoing pain, demonstrating a lack of tolerance
over this time course. Importantly, continuous infusion of R9-CBD3-A6K did not
affect motor activity, anxiety, depression, or memory and learning. Collectively,
these results validate the potential therapeutic significance of targeting the
CaV-CRMP2 axis for treatment of neuropathic pain.
|Action Potentials/drug effects
[MESH]
|Animals
[MESH]
|Anxiety/drug therapy/etiology
[MESH]
|Aptamers, Peptide/pharmacology/*therapeutic use
[MESH]
|Disease Models, Animal
[MESH]
|Dopamine/metabolism
[MESH]
|Electric Stimulation
[MESH]
|Exploratory Behavior/drug effects
[MESH]
|Female
[MESH]
|Ganglia, Spinal/cytology
[MESH]
|Hindlimb Suspension
[MESH]
|Hyperalgesia/drug therapy
[MESH]
|Intercellular Signaling Peptides and Proteins/*chemistry
[MESH]