Functional lipidomics. Calcium-independent activation of endocannabinoid/endovanilloid lipid signalling in sensory neurons by protein kinases C and A and thrombin

Autor: Vittorio Vellani, Massimiliano Prandini, Pier Cosimo Magherini, Vincenzo Di Marzo, Luciano De Petrocellis, Marta Valenti, Peter A. McNaughton, Stefania Petrosino
Rok vydání: 2008
Předmět:
Cannabinoid receptor
medicine.medical_treatment
2-Arachidonoylglycerol
Anandamide
Cannabinoid
CB1
Channel
Metabotropic
Signalling
TRPV1
Vanilloid
Rats
Sprague-Dawley
chemistry.chemical_compound
Cannabinoid Vanilloid Signalling
Ganglia
Spinal
Egtazic Acid
Cells
Cultured
Protein Kinase C
Forskolin
Chemistry
Thrombin
Endocannabinoid system
Tetradecanoylphorbol Acetate
lipids (amino acids
peptides
and proteins)
Signal Transduction
medicine.medical_specialty
Sensory Receptor Cells
Receptors
Proteinase-Activated
Arachidonic Acids
Glycerides
Cellular and Molecular Neuroscience
Internal medicine
Cannabinoid Receptor Modulators
Thrombin receptor
medicine
Animals
Humans
Protein kinase C
Pharmacology
Colforsin
Cyclic AMP-Dependent Protein Kinases
Rats
Endocrinology
Animals
Newborn
nervous system
Calcium
Endocannabinoids
Zdroj: Neuropharmacology 55 (2008): 1274–1279. doi:10.1016/j.neuropharm.2008.01.010
info:cnr-pdr/source/autori:Vellani V., Petrosino S., De Petrocellis L., Valenti M., Prandini M., Magherini P.C., McNaughton P.A., and Di Marzo V./titolo:Functional lipidomics. Calcium-independent activation of endocannabinoid%2Fendovanilloid lipid signalling in sensory neurons by protein kinases C and A and thrombin./doi:10.1016%2Fj.neuropharm.2008.01.010/rivista:Neuropharmacology/anno:2008/pagina_da:1274/pagina_a:1279/intervallo_pagine:1274–1279/volume:55
ISSN: 0028-3908
DOI: 10.1016/j.neuropharm.2008.01.010
Popis: N-arachidonoylethanolamine (anandamide, AEA), is a full agonist at both cannabinoid CB1 receptors and “transient receptor potential vanilloid” type 1 (TRPV1) channels, and N-palmitoylethanolamine (PEA) potentiates these effects. In neurons of the rat dorsal root ganglia (DRG), TRPV1 is activated and/or sensitised by AEA as well as upon activation of protein kinases C (PKC) and A (PKA). We investigated here the effect on AEA levels of PKC and PKA activators in DRG neurons. AEA levels were significantly enhanced by both phorbol-miristoyl-acetate (PMA), a typical PKC activator, and forskolin (FSK), an adenylate cyclase stimulant, as well as by thrombin, which also activates PKC by stimulating protease-activated receptors (PARs). The levels of the other endocannabinoid and TRPV1-inactive compound, 2-arachidonoylglycerol (2-AG), were enhanced only by thrombin and to a lesser extent than AEA, whereas PEA was not affected by any of the treatments. Importantly, FSK- and PMA-induced elevation of AEA levels was not sensitive to intracellular Ca2+ chelation with BAPTA-acetoxymethyl (AM) ester. In human embryonic kidney (HEK-293) cells, which constitutively express PARs, thrombin, PMA and FSK elevated AEA levels, and the effects of the two former compounds were counteracted by the PKC inhibitor, RO318220, whereas the effect of FSK was reduced by the PKA inhibitor RpcAMPs. In conclusion, we report that AEA levels are stimulated by both PKC, either directly or after thrombin receptor activation, and PKA, possibly in a way independent from intracellular calcium. Since AEA activates TRPV1, these findings may suggest the existence of an amplificatory cascades on this receptor in sensory neurons.
Databáze: OpenAIRE
Externí odkaz: