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The Journal of Neuroscience, May 1, 1998, 18(9):3386-3403
GABAergic Cells Are the Major Postsynaptic Targets of Mossy Fibers in the Rat Hippocampus
László Acsády1, 2, Anita Kamondi1, Attila Sík2, Tamás Freund2, and György Buzsáki1 1 Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, Newark, New Jersey 07102, and 2 Institute of Experimental Medicine, Hungarian Academy of Sciences, H-1450 Budapest, Hungary
Dentate granule cells communicate with their postsynaptic targets by three distinct terminal types. These include the large mossy terminals, filopodial extensions of the mossy terminals, and smaller en passant synaptic varicosities. We examined the postsynaptic targets of mossy fibers by combining in vivo intracellular labeling of granule cells, immunocytochemistry, and electron microscopy. Single granule cells formed large, complex "mossy" synapses on 11-15 CA3 pyramidal cells and 7-12 hilar mossy cells. In contrast, GABAergic interneurons, identified with immunostaining for substance P-receptor, parvalbumin, and mGluR1a-receptor, were selectively innervated by very thin (filopodial) extensions of the mossy terminals and by small en passant boutons in both the hilar and CA3 regions. These terminals formed single, often perforated, asymmetric synapses on the cell bodies, dendrites, and spines of GABAergic interneurons. The number of filopodial extensions and small terminals was 10 times larger than the number of mossy terminals. These findings show that in contrast to cortical pyramidal neurons, (1) granule cells developed distinct types of terminals to affect interneurons and pyramidal cells and (2) they innervated more inhibitory than excitatory cells. These findings may explain the physiological observations that increased activity of granule cells suppresses the overall excitability of the CA3 recurrent system and may form the structural basis of the target-dependent regulation of glutamate release in the mossy fiber system.
Key words: granule cell; mossy fiber; interneuron; spine; dentate gyrus; in vivo
Copyright © 1998 Society for Neuroscience 0270-6474/98/1893386-18$05.00/0
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