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Vesicular glutamate (VGlut), GABA (VGAT), and acetylcholine (VACht) transporters in basal forebrain axon terminals innervating the lateral hypothalamus
Author(s) -
Henny Pablo,
Jones Barbara E.
Publication year - 2006
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.20928
Subject(s) - basal forebrain , biology , glutamatergic , vesicular acetylcholine transporter , cholinergic neuron , neuroscience , biotinylated dextran amine , cholinergic , gabaergic , substantia innominata , inhibitory postsynaptic potential , microbiology and biotechnology , glutamate receptor , axon , choline acetyltransferase , biochemistry , receptor
The basal forebrain (BF) is known to play important roles in cortical activation and sleep, which are likely mediated by chemically differentiated cell groups including cholinergic, γ‐aminobutyric acid (GABA)ergic and other unidentified neurons. One important target of these cells is the lateral hypothalamus (LH), which is critical for arousal and the maintenance of wakefulness. To determine whether chemically specific BF neurons provide an innervation to the LH, we employed anterograde transport of 10,000 MW biotinylated dextran amine (BDA) together with immunohistochemical staining of the vesicular transporter proteins (VTPs) for glutamate (VGluT1, ‐2, and ‐3), GABA (VGAT), or acetylcholine (ACh, VAChT). In addition, we applied triple staining for the postsynaptic proteins (PSPs), PSD‐95 with VGluT or Gephyrin (Geph) with VGAT, to examine whether the BDA‐labeled varicosities may form excitatory or inhibitory synapses in the LH. Axons originating from BDA‐labeled neurons in the magnocellular preoptic nucleus (MCPO) and substantia innominata (SI) descended within the medial forebrain bundle and extended collateral varicose fibers to contact LH neurons. In the LH, the BDA‐labeled varicosities were immunopositive (+) for VAChT (∼10%), VGluT2 (∼25%), or VGAT (∼50%), revealing an important influence of newly identified glutamatergic together with GABAergic BF inputs. Moreover, in confocal microscopy, VGluT2+ and VGAT+ terminals were apposed to PSD‐95+ and Geph+ profiles respectively, indicating that they formed synaptic contacts with LH neurons. The important inputs from glutamatergic and GABAergic BF cells could thus regulate LH neurons in an opposing manner to stimulate vs. suppress cortical activation and behavioral arousal reciprocally. J. Comp. Neurol. 496:453–467, 2006. © 2006 Wiley‐Liss, Inc.