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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
Sustained cannabinoid agonist treatment augments CGRP release in a PKA-dependent manner.
Neuroreport 2009 May 28
Studies have shown that sustained cannabinoid treatment increases the sensitivity to painful heat stimuli (thermal hyperalgesia) and innocuous mechanical stimuli (tactile allodynia). It has been suggested that augmented release of pain neurotransmitters (such as calcitonin gene-related peptide, CGRP) might be responsible for this abnormal pain sensitization. We hypothesize that intracellular adaptations upon sustained cannabinoid treatment causes augmented release of CGRP from primary nociceptors leading to increased pain sensitivity. We show that sustained (24 h) cannabinoid agonist [(+)WIN 55,212-2] treatment of 7-day-old neonatal rat dorsal root ganglion neurons significantly augments basal CGRP release from these cells in a protein kinase A-dependent manner. Our results indicate that these intracellular compensatory adaptations may play a crucial trigger role in further neuronal system adaptations for modulation of pain.
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