Abstract
The importance of 2-AG-mediated endogenous cannabinoid signaling in spinal pain control has recently been well substantiated. Although the degradation of 2-AG seems to be essential in cannabinoid-mediated spinal nociceptive information processing, no experimental data are available about the cellular distribution of monoacylglycerol lipase (MGL), the main degrading enzyme of 2-AG in the spinal dorsal horn. Thus, here we investigated the cellular distribution of MGL in laminae I–II of the spinal gray matter with immunocytochemical methods and revealed an abundant immunoreactivity for MGL in the rodent superficial spinal dorsal horn. We addressed the co-localization of MGL with markers of peptidergic and non-peptidergic primary afferents, axon terminals of putative glutamatergic and GABAergic spinal neurons, as well as astrocytic and microglial profiles, and we found that nearly 17 % of the peptidergic (immunoreactive for CGRP), a bit more than 10 % of the axon terminals of putative glutamatergic spinal neurons (immunoreactive for VGLUT2), and approximately 20 % of the astrocytic (immunoreactive for GFAP) profiles were immunolabeled for MGL. On the other hand, however, axon terminals of non-peptidergic (binding isolectin-B4) nociceptive primary afferents and putative inhibitory spinal neurons (immunoreactive for VGAT) as well as microglial (immunoreactive for CD11b) profiles showed negligible immunostaining for MGL. The results suggest that only nociceptive inputs arriving through a population of CGRP immunoreactive fibers are modulated by the spinal DGLα–MGL pathway. We also postulate that the DGLα–MGL signaling pathway may modulate spinal excitatory but not inhibitory neural circuits.
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References
Alger BE (2012) Endocannabinoids at the synapse a decade after the dies mirabilis (29 March 2001): what we still do not know. J Physiol 590:2203–2212
Alvarez FJ, Villalra RM, Zerda R, Schneider SP (2004) Vesicular glutamate transporter in the spinal cord, with special reference to sensory primary afferent synapses. J Comp Neurol 472:257–280
Araque A, Carmignoto G, Haydon PG (2001) Dynamic signaling between neurons and glia. Annu Rev Physiol 63:795–813
Beltramo M, Piomelli D (2000) Carrier-mediated transport and enzymatic hydrolysis of the endogenous cannabinoid 2-arachidonylglycerol. Neuroreport 11:1231–1235
Blankman JL, Simon GM, Cravatt BF (2007) A comprehensive profile of brain enzymes that hydrolyze the endocannabinoid 2-arachidonoylglycerol. Chem Biol 14:1347–1356
Brumovsky P, Watanabe M, Hökfelt T (2007) Expression of the vesicular glutamate transporter-1 and -2 in adult mouse dorsal root ganglia and spinal cord and their regulation by nerve injury. Neuroscience 147:469–490
Cabral GA, Marciano-Cabral F (2005) Cannabinoid receptors in microglia of the central nervous system: immune functional relevance. J Leukoc Biol 78:1192–1197
Cao H, Zhang YQ (2008) Spinal glia activation contributes to pathological pain states. Neurosci Behav Rev 32:972–983
Chanda PK, Gao Y, Mark L, Joan Btesh J, Strassle BW, Lu P, Piesla MJ, Zhang MJ, Bingham B, Uveges A, Kowal D, Garbe D, Kouranova EV, Ring RH, Bates B, Pangalos MN, Kennedy JD, Whiteside GT, Samad TA (2010) Monoacylglycerol lipase activity is a critical modulator of the tone and integrity of the endocannabinoid system. Mol Pharmacol 78:996–1003
Chang L, Luo L, Palmer JA, Sutton S, Wilson SJ, Barbier AJ, Breitenbucher JG, Chaplan SR, Webb M (2006) Inhibition of fatty acid amide hydrolase produces analgesia by multiple mechanisms. Br J Pharmacol 148:102113
Chaudhry FA, Reimer RJ, Bellocchio EE, Danbolt NC, Osen KK, Edwards RH, Storm-Mathisen J (1998) The vesicular GABA transporter, VGAT, localizes to synaptic vesicles in sets of glycinergic as well as GABAergic neurons. J Neurosci 18:9733–9750
Chevaleyre V, Takahashi KA, Castillo PE (2006) Endocannabinoid-mediated synaptic plasticity in the CNS. Ann Rev Neurosci 29:37–76
Cravatt BF, Demarest K, Patricelli MP, Bracey MH, Giang DK, Martin BR, Lichtman AH (2001) Supersensitivity to anandamide and enhanced endogenous cannabinoid signaling in mice lacking fatty acid amide hydrolase. Proc Natl Acad Sci USA 98:9371–9376
Di S, Popescu IR, Tasker JG (2013) Glial control of endocannabinoid heterosynaptic modulation in hypothalamic magnocellular neuroendocrine cells. J Neurosci 33:18331–18342
Dinh TP, Carpenter D, Leslie FM, Freund TF, Katona I, Sensi SL, Kathuria S, Piomelli D (2002) Brain monoglyceride lipase participating in endocannabinoid inactivation. Proc Natl Acad Sci USA 99:10819–10824
Eriksson NP, Persson JK, Svensson M, Arvidsson J, Molander C, Aldskogius H (1993) A quantitative analysis of the microglial cell reaction in central primary sensory projection territories following peripheral nerve injury in the adult rat. Exp Brain Res 96:9–27
Fowler C, Tiger G (2005) Cyclooxygenation of the arachidonoyl side chain of 1-arachidonoylglycerol and related compounds block their ability to prevent anandamide and 2-oleoylglycerol metabolism by rat brain in vitro. Biochem Pharmacol 69:1241–1245
Freund TF, Katona I, Piomelli D (2003) Role of endogenous cannabinoids in synaptic signaling. Physiol Rev 83:1017–1066
Garrison CJ, Dougherty PM, Kajander KC, Carlton SM (1991) Staining of glial fibrillary acidic protein (GFAP) in lumbar spinal cord increases following a sciatic nerve constriction injury. Brain Res 565:1–7
Gordon GR, Iremonger KJ, Kantevari S, Ellies-Davies GC, MacVicar BA, Bains JS (2009) Astrocyte-mediated distributed plasticity at hypothalamic glutamate synapses. Neuron 64:391–403
Graeber MB (2010) Changing face of microglia. Science 330:783–788
Gulyás AI, Cravatt BF, Bracey MH, Dinh TP, Piomelli D, Boscia F, Freund F (2004) Segregation of two endocannabinoid-hydrolyzing enzyme into pre- and postsynaptic compartments in the rat hippocampus, cerebellum and amygdale. Eur J Neurosci 20:441–458
Guo A, Vulchanova L, Wang J, Li X, Elde R (1999) Immunocytochemical localization of the vanilloid receptor 1 (VR1): relationship to neuropeptides, the P2X3 purinoceptor and IB4 binding sites. Eur J Neurosci 11:946–958
Hashimoto K, Yoshida T, Sakimura K, Mishina M, Watanabe M, Kano M (2008) Influence of parallel fiber-Purkinje cell synapse formation on postnatal development of climbing fiber-Purkinje cell synapses in the cerebellum. Neuroscience 162:601–611
Hashimotodani Y, Ohno-Shosaku T, Kano M (2007) Ca2+-associated receptor driven endocannabinoid release: mechanisms that associate presynaptic and postsynaptic activities. Curr Opin Neurobiol 17:360–365
Haydon PG, Carmingnoto G (2006) Astrocyte control of synaptic transmission and neurovascular coupling. Physiol Rev 86:1009–1031
Hegyi Z, Kis G, Holló K, Leden C, Antal M (2009) Neuronal and glial localization of the cannabinoid-1 receptor in the superficial spinal dorsal horn of the rodent spinal cord. Eur J Neurosci 30:251–262
Hegyi Z, Holló K, Kis G, Mackie K, Antal M (2012) Differential distribution of diacylglycerol lipase-alpha and N-acylphosphatidylethanolamine-specific phospholipase D immunoreactivity in the superficial spinal dorsal horn of rats. Glia 60:1316–1329
Kano M, Ohno-Shosaku T, Hashimotodani Y, Uchigashima M, Watanabe M (2009) Endocannabinoid-mediated control of synaptic transmission. Physiol Rev 89:309–380
Kinsey SG, Long JZ, O’Neal ST, Abdullah RA, Poklis JL, Boger DL, Cravatt BF, Lichtman AH (2009) Blockade of endocannabinoid-degrading enzymes attenuates neuropathic pain. J Pharmacol Exp Ther 330:902–910
Kogan NM, Mechoulam R (2006) The chemistry of endocannabinoids. J Endocrinol Invest 29(Suppl. 3):3–14
Kozak KR, Crews BC, Morrow JD, Wang LH, Ma YH, Weinander R, Jakobsson PJ, Marnett LJ (2002) Metabolism of the endocannabinoids, 2-arachidonylglycerol and anandamide, into prostaglandin, thromboxane, and prostacyclin glycerol esters and ethanolamides. J Biol Chem 277:44877–44885
Kozak KR, Prusakiewicz JJ, Marnett LJ (2004) Oxidative metabolism of endocannabinoids by COX-2. Curr Pharm Des 10:659–667
Laemmli UK (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227:680–685
Lambert DM, Fowler CJ (2005) The endocannabinoid system: drug targets, lead compounds, and potential therapeutic applications. J Med Chem 48:5059–5087
Li JL, Fujimaya F, Kaneko T, Mizuno N (2003) Expression of vesicular glutamate transporters, VGluT1 and VGluT2, in axon terminals of nociceptive primary afferent fibers in the superficial layers of the medullary and spinal dorsal horns of the rat. J Comp Neurol 457:236–249
Long JZ, Li W, Booker L, Burston JJ, Kinsey SG, Schlosburg JE, Pavón FJ, Serrano AM, Selley DE, Parsons LH, Lichtman AH, Cravatt BF (2009) Selective blockade of 2-arachidonoylglycerol hydrolysis produces cannabinoid behavioral effects. Nat Chem Biol 5:37–44
Makara JK, Mor M, Fegley D, Szabó SI, Kathuria S, Astarita G, Duranti A, Tontini A, Tarzia G, Rivara S, Freund TF, Piomelli D (2005) Selective inhibition of 2-AG hydrolysis enhances endocannabinoid signaling in hippocampus. Nat Neurosci 8:1139–1141
McClung JR, Castro AJ (1978) Rexed's laminar scheme as it applies to the rat cervical spinal cord. Exp Neurol 58:145–148
McNeil DL, Chung K, Hulsebosch CE, Bolander RP, Coggeshall RE (1988) Numbers of synapses in laminae I-IV of the rat dorsal horn. J Comp Neurol 278:453–460
Mechoulam R, Ben-Shabat S, Hanus L, Ligunsky M, Kaminski NE, Schatz AR, Gopher A, Almog S, Martin BR, Compton DR (1995) Identification of an endogenous 2-monoglyceride, present in canine gut, that binds to cannabinoid receptors. Biochem Pharmacol 50:83–90
Molander C, Xu Q, Grant G (1984) The cytoerchitectonic organization of the spinal cord in the rat. I. The lower thoracic and lumbosacral cord. J Comp Neurol 230:133–141
Molander C, Hongpaisan J, Evensson M, Aldskogius H (1997) Glial cell reactions in the spinal cord after sensory nerve stimulation are associated with axonal injury. Brain Res 747:122–129
Murataeva N, Straiker A, Mackie K (2014) Parsing the players: 2-arachidonoylglycerol synthesis and degradation in the CNS. Br J Pharmacol 171:1379–1391
Nasu F (1999) Analysis of calcitonin gene-related peptide (CGRP)-containing nerve fibres in the rat spinal cord using light and electron microscopy. J Electron Microsc 48:267–275
Navarrate M, Araque A (2008) Endocannabinoids mediate neuron-astrocyte communication. Neuron 57:883–893
Nedergaard M, Ransom B, Goldman SA (2003) New roles for astrocytes: redefining the functional architecture of the brain. Trends Neurosci 26:523–530
Nyilas R, Gregg LC, Mackie K, Watanabe M, Zimmer A, Hohmann AG, Katona I (2009) Molecular architecture of endocannabinoid signaling at nociceptive synapses mediating analgesia. Eur J Neurosci 29:1964–1978
Oliveira ALR, Hydling F, Olsson E, Shi T, Edwards RH, Fujiyama F, Kaneko T, Hökfelt T, Cullheim S, Meister B (2003) Cellular localization of three vesicular glutamate transporter mRNAs and proteins in rat spinal cord and dorsal root ganglia. Synapse 50:117–129
Pan B, Wang W, Long JZ, Sun D, Hillard CJ, Cravatt BF, Liu QS (2009) Blockade of 2-arachidonoylglycerol hydrolysis by selective monoacylglycerol lipase inhibitor 4-nitrophenyl 4-(dibenzo[d][1,3]dioxil-5yl(hydroxyl)methyl) piperidine-1carboxylate (JZL184) enhances retrograde endocannabinoid signaling. J Pharmacol Exp Ther 331:591–597
Pan B, Wang W, Zhong P, Blankman JL, Cravatt BF, Liu QS (2011) Alterations of endocannabinoid signaling, synaptic plasticity, learning, and memory in monoacylglycerol lipase knock-out mice. J Neurosci 31:13420–13430
Patricelli MP, Cravatt BF (2001) Proteins regulating the biosynthesis and inactivation of neuromodulatory fatty acid amides. Vitam Horm 62:95–131
Piet R, Vargová L, Syková E, Poulain DA, Oliet SH (2004) Physiological contribution of the astrocytic environment of neurons to intersynaptic crosstalk. Proc Natl Acad Sci USA 101:2151–2155
Polgar E, Todd AJ (2008) Tactile allodynia can occur in the spared nerve injury model in the rat without selective loss of GABA or GABA(A) receptors from synapses in laminae I–II of the ipsilateral spinal dorsal horn. Neurosciemce 156:193–202
Ribeiro da Silva A, De Korninck Y (2009) Morphological and neurochemical organization of the spinal dorsal horn. In: Basbaum AI, Bushnell MC (eds) Science of pain. Elsevier, Oxford, pp 279–310
Rodriquez JJ, Mackie K, Pickel VM (2001) Ultrastructural localization of the CB1 cannabinoid receptor in mu-opioid receptor patches of the rat caudate putamen nucleus. J Neurosci 21:823–833
Salio C, Doly S, Fischer J, Franzoni MF, Conrath M (2002) Neuronal and astrocytic localization of the cannabinoid receptor-1 in the dorsal horn of the rat spinal cord. Neurosci Lett 329:13–16
Schlosburg JE, Blankman JL, Long JZ, Nomura DK, Pan B, Kinsey SG, Nguyen PT, Ramesh D, Booker L, Burston JJ, Thomas EA, Selley DE, Sim-Selley LJ, Liu QS, Lichtman AH, Cravatt BF (2010) Chronic monoacylglycerol lipase blockade causes functional antagonism of the endocannabinoid system. Nat Neurosci 13:1113–1119
Scholz J, Woolf CJ (2007) The neuropathic pain triad: neurons, immune cells and glia. Nat Neurosci 11:1361–1368
Starowicz K, Makuch W, Korostynski M, Malek N, Slezak M, Zychowska M, Petrosino S, De Petrocellis L, Cristino L, Przewlocka B, Di Marzo V (2013) Full inhibition of spinal FAAH leads to TRPV1-mediated analgesic effects in neuropathic rats and possible lipoxygenase-mediated remodeling of anandamide metabolism. PLoS One 8:e60040
Stella N (2009) Endocannabinoid signaling in microglial cells. Neuropharmacol 56(Suppl 1):244–253
Straiker A, Mackie K (2009) Cannabinoid signaling in inhibitory autaptic hippocampal neurons. Neuroscience 163:190–201
Straiker A, Hu SS, Long JZ, Arnold A, Wager-Miller J, Cravatt BF, Mackie K (2009) Monoacylglycerol lipase limits the duration of endocannabinoid-mediated depolarization-induced suppression of excitation in autaptic hippocampal neurons. Mol Pharmacol 76:1220–1227
Sugiura T, Kondo S, Sukagawa A, Nakane S, Shinoda A, Itoh K, Yamashita A, Waku K (1995) 2-Arachidonoylglycerol: a possible endogenous cannabinoid receptor ligand in brain. Biochem Biophys Res Commun 215:89–97
Suter MR, Wen YR, Decosterd I, Ji RR (2007) Do glial cells control pain? Neuron Glia Biol 3:255–268
Szabo B, Urbanski MJ, Bisogno T, Di Marzo V, Mendiguren A, Baer WU, Freiman I (2006) Depolarization-induced retrograde synaptic inhibition in the mouse cerebellar cortex is mediated by 2-arachidonoylglycerol. J Physiol 577:263–280
Tanimura A, Uchigasima M, Yamazaki M, Uesaka N, Mikuni T, Abe M, Hashimoto K, Watanabe M, Sakimura K, Kano M (2012) Synapse type-independent degradation of the endocannabinoid 2-arachidonoylglycerol after retrograde synaptic suppression. PNAS 109:12195–12200
Tasker JG, Oliet SH, Bains JS, Brown CH, Stern JE (2012) Glial regulation of neuronal function: from synapse to systems physiology. J Neuroendocrinol 24:566–576
Todd AJ, Hughes DI, Polgár E, Nagy GG, Mackie M, Ottersen OP, Maxwell DJ (2003) The expression of vesicular glutamate transporters VGLUT1 and VGLUT2 in neurochemically defined axonal populations in the rat spinal cord with emphasis on the dorsal horn. Eur J Neurosci 17:13–27
Traub RJ, Solodkin A, Ruda MA (1989) Calcitonin gene-related peptide immunoreactivity in the cat lumbosacral spinal cord and the effects of multiple dorsal rhizotomies. J Comp Neurol 287:225–237
Uchigasima M, Yamazaki M, Yamasaki M, Tanimura A, Sakimura K, Kano M, Watanabe M (2011) Molecular and morphological configuration for 2-arachidonoylglycerol-mediated retrograde signaling at mossy cell-granule cell synapses in the dentate gyrus. J Neurosci 31:7700–7714
van der Stelt M, Noordermeer MA, Kiss T, Van Zadelhoff G, Merghart B, Veldink GA, Vliegenthart JF (2000) Formation of a new class of oxylipins from N-acyl(ethanol)amines by the lipoxygenase pathway. Eur J Biochem 267:2000–2007
Vandevoorde S, Lambert DM (2007) The multiple pathways of endocannabinoid metabolism: a zoom out. Chem Biodivers 4:1858–1881
Volterra A, Bezzi P (2002) The tripartite synapse: Glia. In: Volterra A, Magistretti PJ, Haydon PG (eds) Synaptic transmission. Oxford UP, New York, pp 164–168
Walter L, Stella L (2003) Endothelin-1 increases 2-arachidonyl glycerol (2-AG) production in astrocytes. Glia 44:85–90
Walter L, Dinh T, Stella N (2004) ATP induces a rapid and pronounced increase in 2-arachidonylglycerol production by astrocytes, a response limited by monoacylglycerol lipase. J Neurosci 24:8068–8074
Willis WD, Coggeshall RE (2004) Sensory mechanisms of the spinal cord, vol 1., Primary afferent neurons and the spinal dorsal hornKluwer Academic/Plenum Publishers, New York
Witting A, Walter L, Wacker J, Moller T, Stella N (2004) P2X7 receptors control 2-arachidonoylglycerol production by microglial cells. Proc Natl Acad Sci USA 101:3214–3219
Woodhams SG, Wong A, Barrett DA, Bennett AJ, Chapman V, Alexander SP (2012) Spinal administration of the monoacylglycerol lipase inhibitor JZL184 produces robust inhibitory effects on nociceptive processing and the development of central sensitization in the rat. Br J Pharmacol 167:1609–1619
Zhang F, Vadakkan KI, Kim SS, Wu LJ, Shang Y, Zhuo M (2008) Selective activation of microglia in spinal cord but not higher cortical regions following nerve injury in adult mouse. Mol Pain 4:1–16
Zohng P, Pan B, Gao XP, Blankman JL, Cravatt BF, Liu QS (2011) Genetic deletion of monoacylglycerol lipase alters endocannabinoid-mediated retrograde synaptic depression in the cerebellum. J Physiol 589:4847–4855
Acknowledgments
The authors are thankful to Ken Mackie (Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA) for kindly providing spinal cord samples from MGL knock out mice for the experiments. This work was supported by the Hungarian Academy of Sciences (MTA-TKI 242) and the Hungarian Brain Research Program (Grant No. KTIA_13_NAP-A-I/8).
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Dócs, K., Hegyi, Z., Holló, K. et al. Selective axonal and glial distribution of monoacylglycerol lipase immunoreactivity in the superficial spinal dorsal horn of rodents. Brain Struct Funct 220, 2625–2637 (2015). https://doi.org/10.1007/s00429-014-0813-x
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DOI: https://doi.org/10.1007/s00429-014-0813-x