Abstract
The Ca 2+ /calmodulin-dependent protein phosphatase 2B or calcineurin (CN) participates in several Ca 2+ -dependent signal transduction cascades and, thus, contributes to the short and long term regulation of neuronal excitability. By using a specific antibody to CN, we demonstrate its absence from hippocampal interneurons and illustrate a physiological consequence of such CN deficiency. Consistent with the lack of CN in interneurons as detected by immunocytochemistry, the CN inhibitors FK-506 or okadaic acid significantly prolonged N -methyl- d -aspartate channel openings recorded in the cell-attached mode in hippocampal principal cells but not those recorded in interneurons. Interneurons were also devoid of Ca 2+ /calmodulin-dependent protein kinase IIα, yet many of their nuclei contained the cyclic AMP-responsive element binding protein. On the basis of the CN and Ca 2+ /calmodulin-dependent protein kinase IIα deficiency of interneurons, entirely different biochemical mechanisms are expected to govern Ca 2+ -dependent neuronal plasticity in interneurons versus principal cells.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 10:35 a.m.) |
Deposited | 3 years, 4 months ago (April 13, 2022, 4:19 p.m.) |
Indexed | 3 weeks ago (Aug. 3, 2025, 12:20 a.m.) |
Issued | 27 years, 5 months ago (March 17, 1998) |
Published | 27 years, 5 months ago (March 17, 1998) |
Published Online | 27 years, 5 months ago (March 17, 1998) |
Published Print | 27 years, 5 months ago (March 17, 1998) |
@article{S_k_1998, title={The absence of a major Ca 2+ signaling pathway in GABAergic neurons of the hippocampus}, volume={95}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.95.6.3245}, DOI={10.1073/pnas.95.6.3245}, number={6}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Sík, Attila and Hájos, Norbert and Gulácsi, Alexandra and Mody, Istvan and Freund, Tamás F.}, year={1998}, month=mar, pages={3245–3250} }