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The Journal of Neuroscience, October 15, 1998, 18(20):8300-8310

Three-Dimensional Structure and Composition of CA3CA1 Axons in Rat Hippocampal Slices: Implications for Presynaptic Connectivity and Compartmentalization

Gordon M. G. Shepherd¹ and Kristen M. Harris^{2, 3}

¹ Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts 02114, ² Program in Neuroscience, Harvard Medical School, and ³ Division of Neuroscience in the Department of Neurology, Children's Hospital, Boston, Massachusetts 02115

Physiological studies of CA3CA1 synaptic transmission and plasticity have revealed both pre- and postsynaptic effects. Understanding the extent to which individual presynaptic axonal boutons could provide local compartments for control of synaptic efficacy and microconnectivity requires knowledge of their three-dimensional morphology and composition. In hippocampal slices, serial electron microscopy was used to examine a nearly homogeneous population of CA3CA1 axons in the middle of stratum radiatum of area CA1. The locations of postsynaptic densities (PSDs), vesicles, and mitochondria were determined along 75 axon segments (9.1 ± 2.0 µm in length). Synapses, defined by the colocalization of PSDs and vesicles, occurred on average at 2.7 µm intervals along the axons. Most varicosities (68%) had one PSD, 19% had 2-4 PSDs, and 13% had none. Synaptic vesicles occurred in 90% of the varicosities. One-half (53%) of the varicosities lacked mitochondria, raising questions about their regulation of ATP and Ca²⁺, and 8% of varicosities contained only mitochondria. Eleven axons were reconstructed fully. The varicosities were oblong and varied greatly in both length (1.1 ± 0.7 µm) and volume (0.13 ± 0.14 µm³), whereas the intervaricosity shafts were narrow, tubular, and similar in diameter (0.17 ± 0.04 µm) but variable in length (1.4 ± 1.2 µm). The narrow axonal shafts resemble dendritic spine necks and thus could promote biochemical compartmentalization of individual axonal varicosities. The findings raise the intriguing possibility of localized differences in metabolism and connectivity among different axons, varicosities, and synapses.

Key words: CA3; CA1; pyramidal neuron; Schaffer collaterals; boutons en passant; axonal varicosities; presynaptic terminal; postsynaptic density; synaptic vesicles; mitochondria; ultrastructure

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Copyright © 1998 Society for Neuroscience  0270-6474/98/18208300-11$05.00/0

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