Abstract
A puzzling feature of the neocortex is the rich array of inhibitory interneurons. Multiple neuron recordings revealed numerous electrophysiological-anatomical subclasses of neocortical γ-aminobutyric acid–ergic (GABAergic) interneurons and three types of GABAergic synapses. The type of synapse used by each interneuron to influence its neighbors follows three functional organizing principles. These principles suggest that inhibitory synapses could shape the impact of different interneurons according to their specific spatiotemporal patterns of activity and that GABAergic interneuron and synapse diversity may enable combinatorial inhibitory effects in the neocortex.
References
38
Referenced
803
- S. Ramón y Cajal Histology Due Système Nerveux de l'Homme et des Vertébrés L. Azoulay Transl. (Maloine Paris 1911) vol. 2.; E. White Cortical Circuits: Synaptic Organization of the Cerebral Cortex; Structure Function and Theory (Birkhauser Boston 1989).
-
Thomson A. M., Deuchars J., Cereb. Cortex 7, 510 (1997).
(
10.1093/cercor/7.6.510
) / Cereb. Cortex by Thomson A. M. (1997) -
Kawaguchi Y., Kubota Y., Cereb. Cortex 7, 47 (1997);
(
10.1093/cercor/7.6.476
) / Cereb. Cortex by Kawaguchi Y. (1997) -
DeFelipe J., Cereb. Cortex 3, 273 (1993);
(
10.1093/cercor/3.4.273
) / Cereb. Cortex by DeFelipe J. (1993) -
Cauli B., et al., J. Neurosci. 17, 3894 (1997) .
(
10.1523/JNEUROSCI.17-10-03894.1997
) / J. Neurosci. by Cauli B. (1997) -
Connors B. W., Gutnick M. J., Trends Neurosci. 13, 99 (1990).
(
10.1016/0166-2236(90)90185-D
) / Trends Neurosci. by Connors B. W. (1990) 10.1038/1092
-
Fleidervish A., Gutnick M. J., J. Neurophysiol. 73, 2591 (1995).
(
10.1152/jn.1995.73.6.2591
) / J. Neurophysiol. by Fleidervish A. (1995) 10.1073/pnas.95.9.5323
- K. L. Magleby in Synaptic Function G. M. Edelman W. E. Gall J. Cowman Eds. (Wiley New York 1987) pp. 21–56.
- Slice preparation intracellular and extracellular solutions data acquisition model fitting and three-dimensional (3D) reconstructions were as in (7). The model iterations use at least two frequencies five responses and the RTR. Membrane potentials were not corrected for ∼9-mV junction potential.
- Recordings were discarded because of access resistance changes membrane instabilities and synaptic responses below 60 μV and 1.5 pA.
- [Cl − ] out = 133.5 mM and [Cl − ] in = 20 mM; −50.4 mV (Nernst potential); +9 mV (junction potential) expected reversal potential ( V rev ) −41.4 mV.
- Morphometric analysis (NeuroExplorer MicroBrightField Colchester VT): Only contacts by axonal boutons within 0.37 μm were counted. Light microscopic estimates without electron microscopic confirmation can be misleading [
-
Markram H., Lübke J., Frotscher M., Roth A., Sakmann B., J. Physiol. 500, 409 (1997)].
(
10.1113/jphysiol.1997.sp022031
) / J. Physiol. by Markram H. (1997) -
Tamas G., Buhl E. H., Somogyi P., J. Physiol. 500, 715 (1997).
(
10.1113/jphysiol.1997.sp022054
) / J. Physiol. by Tamas G. (1997) - Pilot studies indicated that RTR of 500 ms is optimal for separation of potentially different degrees of residual facilitation and depression.
- Superperfusate (10 min) 0.75 mM [Ca 2+ ] and 2.25 mM [Mg 2+ ].
-
White E. L., Weinfeld W., Lev D. L., Somatosens. Mot. Res. 14, 34 (1997).
(
10.1080/08990229771204
) / Somatosens. Mot. Res. by White E. L. (1997) -
Somogyi P., Kisvarday Z. F., Martin K. A. C., Whitteridge D., Neuroscience 10, 261 (1983).
(
10.1016/0306-4522(83)90133-1
) / Neuroscience by Somogyi P. (1983) - Sholl analysis of the axon was used to produce a histogram of the number of axon segments found in regions progressively further away from the somata; see
- Sholl D. A., J. Anat. 87, 387 (1953); / J. Anat. by Sholl D. A. (1953)
- . ASD median in the histogram of intersections. ASL mean interbranch length.
-
Kisvarday Z. F., Martin K. A. C., Whitteridge D., Somogyi P., J. Comp. Neurol. 241, 111 (1985).
(
10.1002/cne.902410202
) / J. Comp. Neurol. by Kisvarday Z. F. (1985) - Martinotti C., Ann. Freniatr. Sci. Affini. 1, 314 (1889); / Ann. Freniatr. Sci. Affini. by Martinotti C. (1889)
-
Kawaguchi Y., Shindou T., J. Neurosci. 18, 6963 (1998).
(
10.1523/JNEUROSCI.18-17-06963.1998
) / J. Neurosci. by Kawaguchi Y. (1998) -
Feldman M. L., Peters A., J. Comp. Neurol. 179, 761 (1979).
(
10.1002/cne.901790406
) / J. Comp. Neurol. by Feldman M. L. (1979) - Possibly the same as in
-
DeFelipe J., Farien A., Brain Res. 244, 9 (1982).
(
10.1016/0006-8993(82)90898-8
) / Brain Res. by DeFelipe J. (1982) -
M. Steriade I. Timofeev N. Durmuller F. Grenier J. Neurophysiol. 79 483 (1998).
(
10.1152/jn.1998.79.1.483
) -
Kawaguchi Y., J. Neurosci. 15, 2638 (1995).
(
10.1523/JNEUROSCI.15-04-02638.1995
) / J. Neurosci. by Kawaguchi Y. (1995) -
Storm J. F., Nature 336, 379 (1988).
(
10.1038/336379a0
) / Nature by Storm J. F. (1988) - On the basis of methods of data sampling as well as anatomical and electrophysiological binning the 95% confidence intervals (CIs) for the number of classes that would result if the same methods were repeated are [ 11 17 ]. CI was calculated as number of classes ± 1.96 SD among 10 000 bootstrapped data sets sampled with replacement each categorization with the identical procedure to generate a classification binning scheme [
10.1126/science.253.5018.390
- A Monte Carlo permutation test was applied to 10 000 shufflings of the synaptically classified cells to determine their expected distribution among 14 anatomically or physiologically defined categories. Chi-square analysis of type occurrences across categories [M. Siegel and N. J. Castellan Jr. Nonparametric Statistics for the Behavioral Sciences (McGraw-Hill New York ed. 2 1988)] yielded P = 3.1 × 10 −9 indicating that the probability of obtaining the observed synapse mapping randomly is negligible.
- Model fitting of IPSCs at different voltages across V rev yielded essentially identical synaptic parameters indicating that local changes in [Cl − ] do not contribute to synaptic dynamics. Model fitting of IPSPs at different membrane potentials yielded similar parameters indicating negligible contribution of dendritic saturation and activation of nonlinearities. Near identical synaptic dynamics of divergent connections in different PCs despite differences in IPSC/IPSP amplitudes also indicated negligible contribution of nonlinear processes.
- A. Gupta Y. Wang H. Markram data not shown.
- We thank E. White Y. Yaari I. Segev R. Malach and P. Goodman for comments on the manuscript. This study was supported by grants from the Office of Naval Research the Human Frontier Science Program the Minerva Foundation the Israel Science Foundation and the Nella and Leon Benziyo Center for Neurosciences. A.G. is a Minerva Fellow.
Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 27, 2002, 5:45 a.m.) |
Deposited | 1 year, 7 months ago (Jan. 13, 2024, 5:07 a.m.) |
Indexed | 1 month, 3 weeks ago (July 7, 2025, 2:27 a.m.) |
Issued | 25 years, 7 months ago (Jan. 14, 2000) |
Published | 25 years, 7 months ago (Jan. 14, 2000) |
Published Print | 25 years, 7 months ago (Jan. 14, 2000) |
@article{Gupta_2000, title={Organizing Principles for a Diversity of GABAergic Interneurons and Synapses in the Neocortex}, volume={287}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.287.5451.273}, DOI={10.1126/science.287.5451.273}, number={5451}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Gupta, Anirudh and Wang, Yun and Markram, Henry}, year={2000}, month=jan, pages={273–278} }