The Journal of Neuroscience, January 21, 2004, 24(3):762-771; doi:10.1523/JNEUROSCI.4658-03.2004
Previous Article
Cellular/Molecular
Menthol-Induced Ca2+ Release from Presynaptic Ca2+ Stores Potentiates Sensory Synaptic Transmission
Kenzo Tsuzuki,
Hong Xing,
Jennifer Ling, and
Jianguo G. Gu
Department of Oral and Maxillofacial Surgery, McKnight Brain Institute and College of Dentistry, University of Florida, Gainesville, Florida, 32610
Menthol and many of its derivatives produce profound sensory and mental effects. The receptor for menthol has been cloned and named cold- and menthol-sensitive receptor-1 (CMR1) or transient receptor potential channel M8 (TRPM8) receptor. Using a dorsal root ganglion (DRG) and dorsal horn (DH) coculture system as a model for the first sensory synapse in the CNS, we studied menthol effects on sensory synaptic transmission and the underlying mechanisms. We found that menthol increased the frequency of miniature EPSCs (mEPSCs). The effects persisted under an extracellular Ca2+-free condition but were abolished by intracellular BAPTA and pretreatment with thapsigargin. Menthol-induced increases of mEPSC frequency were blocked by 2-aminoethoxydiphenylborane (2-APB) but not affected by the phospholipase C inhibitor U73122 or by the cADP receptor inhibitor 8-bromo-cADPR (8Br-cADPR). Double-patch recordings from DRG-DH pairs showed that menthol could potentiate evoked EPSCs (eEPSCs) and change the paired-pulse ratio of eEPSCs. A Ca2+ imaging study on DRG neurons demonstrated that menthol could directly release Ca2+ from intracellular Ca2+ stores. Menthol-induced Ca2+ release was abolished by 2-APB but not affected by U73122 or 8Br-cADPR. Taken together, our results indicate that menthol can act directly on presynaptic Ca2+ stores of sensory neurons to release Ca2+, resulting in a facilitation of glutamate release and a modulation of neuronal transmission at sensory synapses. Expression of TRPM8 receptor on presynaptic Ca2+ stores, a novel localization for this ligand-gated ion channel, is also strongly suggested.
Key words: spinal cord dorsal horn; patch clamp; menthol; TRP; EPSCs; glutamate
Received July 3, 2003;
revised November 25, 2003;
accepted November 26, 2003.
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