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Effects of inhibition of fatty acid amide hydrolase vs. the anandamide membrane transporter on TRPV1-mediated calcium responses in adult DRG neurons; the role of CB receptors.
Eur J Neurosci. 2006 Dec; 24(12):3489-95.EJ

Abstract

The aim of the present study was to investigate the relationship between TRPV1 stimulation and endocannabinoid-driven CB(1) receptor-mediated inhibition of activity in adult rat dorsal root ganglion (DRG) neurons, a model of primary afferent nociceptors. Calcium-imaging studies were performed to compare the effects of the fatty acid amide hydrolase (FAAH) inhibitor URB597 (1 microm) vs. the anandamide (AEA) uptake inhibitor UCM707 (1 microm) on capsaicin (100 nm) and N-arachidonoyl dopamine (NADA; 1 microm)-evoked changes in intracellular calcium [Ca(2+)](i) in DRG neurons. The ability of the CB(1) receptor antagonist AM251 (1 microm) to modulate the effects of URB597 and UCM707 was also determined. Suprafusion of NADA and capsaicin evoked robust increases in [Ca(2+)](i) in DRG neurons (89 +/- 4% and 132 +/- 6% of the depolarizing KCl response, respectively). Co-incubation with URB597 significantly attenuated both NADA and capsaicin-evoked increases in [Ca(2+)](i) (39 +/- 3% and 79 +/- 4% of KCl response, respectively). Similarly, co-incubation with UCM707 significantly attenuated both NADA and capsaicin-evoked increases in [Ca(2+)](i) (59 +/- 7% and 72 +/- 4% of KCl response, respectively). The CB(1) receptor antagonist AM251 significantly attenuated the effects of URB597 on NADA-evoked increases in [Ca(2+)](i) but not the effects of URB597 on capsaicin-evoked increases in [Ca(2+)](i). By contrast, AM251 significantly attenuated the inhibitory effects of UCM707 on both NADA and capsaicin-evoked increases in [Ca(2+)](i.) These data suggest that transport of both NADA and capsaicin into DRG neurons and the subsequent activation of TRPV1 is partly governed by FAAH-dependent mechanisms as well as via the putative AEA membrane transporter.

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Authors+Show Affiliations

Millns PJ
School of Biomedical Sciences, University of Nottingham, E Floor Medical School, Queen's Medical Centre, Nottingham NG72UH, UK.
Chimenti M
No affiliation info available
Ali N
No affiliation info available
Ryland E
No affiliation info available
de Lago E
No affiliation info available
Fernandez-Ruiz J
No affiliation info available
Chapman V
No affiliation info available
Kendall DA
No affiliation info available

MeSH

AmidohydrolasesAnimalsArachidonic AcidsBenzamidesCalciumCapsaicinCarbamatesCells, CulturedDopamineDrug InteractionsEndocannabinoidsFura-2FuransGanglia, SpinalMaleMembrane PotentialsMembrane Transport ProteinsNeuronsPiperidinesPolyunsaturated AlkamidesPyrazolesRatsRats, Sprague-DawleyTRPV Cation Channels

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

17229097

Citation

Millns, P J., et al. "Effects of Inhibition of Fatty Acid Amide Hydrolase Vs. the Anandamide Membrane Transporter On TRPV1-mediated Calcium Responses in Adult DRG Neurons; the Role of CB Receptors." The European Journal of Neuroscience, vol. 24, no. 12, 2006, pp. 3489-95.
Millns PJ, Chimenti M, Ali N, et al. Effects of inhibition of fatty acid amide hydrolase vs. the anandamide membrane transporter on TRPV1-mediated calcium responses in adult DRG neurons; the role of CB receptors. Eur J Neurosci. 2006;24(12):3489-95.
Millns, P. J., Chimenti, M., Ali, N., Ryland, E., de Lago, E., Fernandez-Ruiz, J., Chapman, V., & Kendall, D. A. (2006). Effects of inhibition of fatty acid amide hydrolase vs. the anandamide membrane transporter on TRPV1-mediated calcium responses in adult DRG neurons; the role of CB receptors. The European Journal of Neuroscience, 24(12), 3489-95.
Millns PJ, et al. Effects of Inhibition of Fatty Acid Amide Hydrolase Vs. the Anandamide Membrane Transporter On TRPV1-mediated Calcium Responses in Adult DRG Neurons; the Role of CB Receptors. Eur J Neurosci. 2006;24(12):3489-95. PubMed PMID: 17229097.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of inhibition of fatty acid amide hydrolase vs. the anandamide membrane transporter on TRPV1-mediated calcium responses in adult DRG neurons; the role of CB receptors. AU - Millns,P J, AU - Chimenti,M, AU - Ali,N, AU - Ryland,E, AU - de Lago,E, AU - Fernandez-Ruiz,J, AU - Chapman,V, AU - Kendall,D A, PY - 2007/1/19/pubmed PY - 2007/3/7/medline PY - 2007/1/19/entrez SP - 3489 EP - 95 JF - The European journal of neuroscience JO - Eur J Neurosci VL - 24 IS - 12 N2 - The aim of the present study was to investigate the relationship between TRPV1 stimulation and endocannabinoid-driven CB(1) receptor-mediated inhibition of activity in adult rat dorsal root ganglion (DRG) neurons, a model of primary afferent nociceptors. Calcium-imaging studies were performed to compare the effects of the fatty acid amide hydrolase (FAAH) inhibitor URB597 (1 microm) vs. the anandamide (AEA) uptake inhibitor UCM707 (1 microm) on capsaicin (100 nm) and N-arachidonoyl dopamine (NADA; 1 microm)-evoked changes in intracellular calcium [Ca(2+)](i) in DRG neurons. The ability of the CB(1) receptor antagonist AM251 (1 microm) to modulate the effects of URB597 and UCM707 was also determined. Suprafusion of NADA and capsaicin evoked robust increases in [Ca(2+)](i) in DRG neurons (89 +/- 4% and 132 +/- 6% of the depolarizing KCl response, respectively). Co-incubation with URB597 significantly attenuated both NADA and capsaicin-evoked increases in [Ca(2+)](i) (39 +/- 3% and 79 +/- 4% of KCl response, respectively). Similarly, co-incubation with UCM707 significantly attenuated both NADA and capsaicin-evoked increases in [Ca(2+)](i) (59 +/- 7% and 72 +/- 4% of KCl response, respectively). The CB(1) receptor antagonist AM251 significantly attenuated the effects of URB597 on NADA-evoked increases in [Ca(2+)](i) but not the effects of URB597 on capsaicin-evoked increases in [Ca(2+)](i). By contrast, AM251 significantly attenuated the inhibitory effects of UCM707 on both NADA and capsaicin-evoked increases in [Ca(2+)](i.) These data suggest that transport of both NADA and capsaicin into DRG neurons and the subsequent activation of TRPV1 is partly governed by FAAH-dependent mechanisms as well as via the putative AEA membrane transporter. SN - 0953-816X UR - https://www.unboundmedicine.com/medline/citation/17229097/Effects_of_inhibition_of_fatty_acid_amide_hydrolase_vs__the_anandamide_membrane_transporter_on_TRPV1_mediated_calcium_responses_in_adult_DRG_neurons L2 - https://doi.org/10.1111/j.1460-9568.2006.05236.x DB - PRIME DP - Unbound Medicine ER -