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The A6 Subunit of the GABA, Receptor Is Concentrated in Both Inhibitory and Excitatory Synapses on Cerebellar Granule Cells

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The A6 Subunit of the GABA, Receptor Is Concentrated in Both Inhibitory and Excitatory Synapses on Cerebellar Granule Cells The Journal of Neuroscience, January 1, 1996, 76(1):103-114 The a6 Subunit of the GABA, Receptor Is Concentrated in Both Inhibitory and Excitatory Synapses on Cerebellar Granule Cells Zoltan Nusser,’ Werner Sieghatt,2 F. Anne Stephenson,3 and Peter Somogyil ‘Medical Research Council, Anatomical Neuropharmacology Unit, University of Oxford, Oxford OX1 3TH, United Kingdom, 2Department of Biochemical Psychiatry, Psychiatrische Universitatsklinik, A- 1090 Vienna, Austria, and 3Department of Pharmaceutical Chemistry, School of Pharmacy, London WC1 N lAX, United Kingdom Although three distinct subunits seem to be sufficient to form a matic membranes at lower densities than in synaptic junctions. functional pentameric GABA, receptor channel, cerebellar The a6 and al subunits were colocalized in many GABAergic granule cells express mRNA for nine subunits. They receive Golgi synapses, demonstrating that both subunits are involved GABAergic input from a relatively homogeneous population of in synaptic transmission in the same synapse. Synapses im- Golgi cells. It is not known whether all subunits are distributed munopositive for only one of the (Y subunits were also found. similarly on the surface of granule cells or whether some of The ~6, but not the al, subunit was also concentrated in them have differential subcellular distribution resulting in dis- glutamatergic mossy fiber synapses, indicating that the (~6 tinct types of synaptic and/or extrasynaptic channels. Antibod- subunit may have several roles depending on its different loca- ies to different parts of the cr6 and al subunits of the GABA, tions. The results demonstrate a partially differential synaptic receptor and electron microscopic immunogold localization targeting of two distinct GABA, receptor subunits on the sur- were used to determine the precise subcellular distribution of face of the same type of neuron. these subunits in relation to specific synaptic inputs. Both Key words: neurotransmission;cerebellum; inhibition; syn- subunits were present in the extrasynaptic dendritic and so- apse; ion channel; immunocytochemistty Cerebellar granule cells receive GABAergic input from a largely synaptic and extrasynaptic GABA, receptors.The latter idea has homogeneouspopulation of Golgi cells at a restricted location on already been suggestedfor the al versus a6 subunits using im- their distal dendrites. They expressmRNA for nine subunitsof munoperoxidaselocalization (Baude et al., 1992). However, the the GABA, receptor (Laurie et al., 1992; Persohn et al., 1992). immunoperoxidasetechnique hasseveral limitations: namely, the Immunoprecipitation and immunoaffinity purification of native peroxidase reaction end-product diffuses from the site of the cerebellar GABA, receptors have revealed several possiblesub- antibody and, as a result, the preciseorigin of the reaction cannot unit combinations(Duggan et al., 1991; McKernan et al., 1991; be determined. Furthermore, quantitative differencescannot be Endo and Olsen, 1993; Mertens et al., 1993; Pollard et al., 1993; assessedin the label intensity betweensynaptic and extrasynaptic Khan et al., 1994;Mathews et al., 1994;Quirk et al., 1994;Togel sites.These problemsare overcome by immunogoldlocalization, et al., 1994). Becauseonly three different subunits are required which provides a quantifiable and nondiffusible label with a res- to form a pentameric functional channel (Sigel et al., 1990; olution of -20 nm (Triller et al., 1985;Hansen et al., 1991;Baude Verdoorn et al., 1990;Angelotti and Macdonald, 1993;Nayeem et et al., 1993; Caruncho et al., 1993;Fujimoto, 1993; Nusseret al., al., 1994),the expressionof numerousGABA, receptor channels, 1994, 1995a,b). differing in their subunit composition,raises at least two possible scenariosregarding their distribution. First, every subunit may be We have reported the relative densitiesof immunoreactive(~1 distributed in a similar manner on the surface of granule cells, and /32/3subunits in synapsesbetween Golgi cell terminals and resulting in identical types of GABA, receptor channelsat syn- granule cell dendrites using a quantitative immunogold method aptic and extrasynaptic sites.This hypothesisis supportedby the (Nusser et al., 1995b). Approximately 180- to 230-fold higher finding that GABA pulsesto nucleated somatic patches,which density of immunolabelcould be found at synaptic sitesthan on lack synapses,elicited GABA currents with similar kinetics to the somaticmembrane for the oil and p2/3 subunits.Furthermore, spontaneousinhibitory postsynapticcurrents (sIPSCs)(Puia et al., the immunolabeling density for the al subunit suggestedtwo 1994). Second, different subunitsmay have dissimilarsubcellular populations of Golgi synapses,having either a high or a low locations on the surface of granule cells, resulting in distinct concentration of al subunit. It is possiblethat synapseshaving low levels of the (~1 subunit contain more a6 subunit, the other (Y Received April 28, 1995; revised Sept. 15, 1995; accepted Sept. 20, 1995. subunit abundantly expressedby granule cells. Cloned 016/3xy2 F.A.S. was supported by the Medical Research Council, UK. Z.N. was supported by a grant from Merck, Sharp and Dohme Ltd. We are grateful to Dr. R. McKernan receptors, in contrast to cylflxy;! receptors, have low affinity for for the use of antibody a6(313-39S), Dr. H. Monyer for the gift of the expression benzodiazepinesbut bind the partial inverse agonist Ro15-4513 vectors containing the GluR subunits, and Dr. R. A. .I. McIlhinney for kindly with high affinity (Sieghartet al., 1987;Luddens et al., 1990;Quirk providing the GluR-transfected COS-7 cells. We are grateful to Ms. D. Latawiec and Mr. J. D. B. Roberts for excellent technical assistance, and to Mr. F. Kennedy and et al., 1994). Thus, it was of particular interest to establishthe Mr. P. Jays for photographic assistance. We thank Dr. Chris L. Thompson for Figure distribution of the a6 subunit in relation to synapsesimmunore- 1A and Simon Pollard for the preparation of affinity-purified oi6 1-16 (R54XV) antibodies. active for the oil subunit. We used immunogoldlocalization and Copyright 0 1995 Society for Neuroscience 0270-6474/95/160103-12$05.00/O three subunit-specificantibodies, recognizing distinct parts of the 104 J. Neurosci., January 1, 1996, 76(1):103-114 Nusser et al. l GABA, Receptors in Inhibitory and Excitatory Synapses 016 subunit, to define the distribution of the (~6 subunit on the Controls surface of cerebellar granule cells. Selective labeling, resembling that obtained with the specific antibodies, could not be detected when the primary antibodies either were omitted or MATERIALS AND METHODS were replaced by 5% normal rabbit serum, or after antibodies R54XV and P24 were preadsorbed with the corresponding peptides (50 pg of Preparation of animals and tissue peptide/ml). Using the rabbit polyclonal antibody to GABA (Hodgson et Nine female Wistar rats (120-200 gm) were anesthetized with Sagatal al., 1985), no plasma membrane labeling was observed with our method, (pentobarbitone sodium, 220 mg/kg, i.p.) and perfused through the heart indicating that the labeling observed on the plasma membrane was with 0.9% saline followed by the fixative containing 4% p-formaldehyde, attributable to the anti-receptor antibodies P24, preadsorbed R54XV, 0.05% glutaraldehyde, and -0.2% picric acid dissolved in 0.1 M phos- a6(313-395). and P16. Antibodies P24. 016(313-395). and oreadsorbed phate buffer (PB), pH 7.4, for 7-15 min (Somogyi et al., 1989). After antibody R54XV,I selectively stained the, cerebellar\ II granule1 cell layer, perfusion, the brains were removed and blocks from the vermis of the demonstrating that the protein(s) recognized by these antibodies is ex- cerebellar cortex were cut out and washed in several changes of 0.1 M PB. pressed at high concentrations by cerebellar granule cells. Using antibod- ies P24 and preadsorbed R54XV under postembedding conditions, no Antibodies immunolabeling was observed at symmetrical or asymmetrical synapses in Three antibodies against different parts of the a6 subunit of the GABA, the cerebellar molecular layer or in the hippocampal CA3 area. None of receptor were used for immunocytochemistry. our antibodies recognizes glutamate receptor (GluR) subunits, which are (1) Affinity-purified polyclonal antibody (R54XV) was raised against known to be expressed by cerebellar granule cells when they are ex- a synthetic peptide corresponding to residues l-15 of the amino acid pressed in COS-7 cells. Although the GluRD subunit could not be tested sequence of the bovine (~6 subunit with an additional C-terminal in transfected cells, this subunit is expressed strongly in the cerebellar cysteine (Thompson et al., 1992). Antibody R54XV was preadsorbed molecular layer (Sato et al., 1993), where none of our (~6 subunit anti- to aldehyde-fixed forebrain sections before immunoblotting and bodies labeled any structure at light or electron microscopic levels. immunocytochemistry. Adsorption of antibody R54XV to fued forebrain. Three female Wistar Immunostaining of COS-7 cells transfected with GluR rats were perfused through the heart as described above; 70- to lOO+m- COS-7 cells were grown in Dulbecco’s modified Eagle’s medium contain- thick forebrain sections were cut with a vibratome, and the sections were ing fetal calf serum supplemented with penicillin/streptomycin (100 mg/ incubated in blocking solution consisting of 20% normal goat serum ml) and sodium pyruvate (1 mM). Cells were transfected with DNA for containing
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