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@article{Anand:2021:10.2147/JPR.S336773,
author = {Anand, U and Oldfield, C and Pacchetti, B and Anand, P and Sodergren, MH},
doi = {10.2147/JPR.S336773},
journal = {Journal of Pain Research},
pages = {3603--3614},
title = {Dose-related inhibition of capsaicin responses by cannabinoids CBG, CBD, THC and their combination in cultured sensory neurons},
url = {http://dx.doi.org/10.2147/JPR.S336773},
volume = {14},
year = {2021}
}

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TY  - JOUR
AB  - AbstractBackground: The analgesic effects of Cannabis sativa are mediated by 9  tetrahydrocannabinol (THC), but the contributions of other bioactive complex components,  including cannabigerol (CBG) and cannabidiol (CBD), are unclear.  We describe the individual and combined effects of CBG, CBD and THC, on blocking capsaicin responses in dorsal root ganglion (DRG), neurons, in an in vitro model of nociceptor hypersensitivity.Materials and Methods: Adult rat DRG were dissected and enzyme digested to obtain a neuronal suspension in BSF2 medium containing 2% fetal calf serum, and the neurotrophic factors NGF and GDNF. After 48 h, cultured neurons were loaded with Fura-2 AM, to determine the effects of cannabinoids on capsaicin responses using calcium imaging.  In control experiments, neurons were treated with vehicle, followed by 1 µM capsaicin. In cannabinoid treated cultures, CBG, CBD or THC were applied individually, or combined (1:1:1 ratio), followed by 1 µM capsaicin.    Data from n=6 experiments were analysed with Student’s t-test, and Pearson’s correlation coefficient. Results:  CBG, CBD and THC, applied individually, elicited dose-related calcium influx in a subset of DRG neurons, and a corresponding dose-related reduction of subsequent responses to capsaicin.  Maximum inhibition of capsaicin responses was observed at 30 µM CBG, 100 µM CBD, and 100 µM THC individually, and with combined CBD+CBG+THC (1:1:1) at 90 µM.  THC+CBD+CBG combined in a 1:1:1 proportion has the potential to enhance the potency of  these compounds applied individually.  There was a high correlation between cannabinoid-mediated calcium influx and reduction of capsaicin responses: CBG = -0.88, THC = -0.97, CBD = -0.99 and combined CBG + THC + CBD = -1.00.  Conclusions: CBG, CBD and THC demonstrated potent dose-related inhibition of capsaicin responses in DRG neurons when applied individually in vitro, and enhanced when applied in combination
AU  - Anand,U
AU  - Oldfield,C
AU  - Pacchetti,B
AU  - Anand,P
AU  - Sodergren,MH
DO  - 10.2147/JPR.S336773
EP  - 3614
PY  - 2021///
SN  - 1178-7090
SP  - 3603
TI  - Dose-related inhibition of capsaicin responses by cannabinoids CBG, CBD, THC and their combination in cultured sensory neurons
T2  - Journal of Pain Research
UR  - http://dx.doi.org/10.2147/JPR.S336773
UR  - http://imperial.ac.uk/people/uanand
UR  - http://hdl.handle.net/10044/1/92866
VL  - 14
ER  -

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