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Alfonso Abizaid, Zhong-Wu Liu, Zane B. Andrews, Marya Shanabrough, Erzsebet Borok, John D. Elsworth, Robert H. Roth, Mark W. Sleeman, Marina R. Picciotto, Matthias H. Tschöp, Xiao-Bing Gao, Tamas L. Horvath
Published in Volume 116, Issue 12
J Clin Invest. 2006; 116(12):3229–3239 doi:10.1172/JCI29867
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Figure 4
Ghrelin alters inhibitory and excitatory inputs of VTA DA cells.

(A and B) Appositions between vGlut2-immunoreactive (red) and TH-immunopositive (green) VTA perikarya were significantly greater in ghrelin-treated animals compared with saline-treated controls. In contrast, appositions between GAD-67–immunolabeled boutons and TH-immunoreactive VTA perikarya were significantly lower in ghrelin-treated animals compared with saline-treated controls. Scale bars: 10 μm. (C) Corresponding to the observed changes in the number of synapses by light and electron microscopy, ghrelin treatment induced a significant elevation in the frequency of mEPSCs compared with saline controls. (D) Conversely, ghrelin administration triggered a significant decrease in the frequency of mIPSCs that was also in line with the light and electron microscopy results. P < 0.05 versus respective saline-treated controls.