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Volume 17, Number 5,
Issue of March 1, 1997
pp. 1848-1859
Copyright ©1997 Society for Neuroscience
Estradiol Increases the Sensitivity of Hippocampal CA1 Pyramidal
Cells to NMDA Receptor-Mediated Synaptic Input: Correlation with
Dendritic Spine Density
Received Sept. 12, 1996; revised Dec. 12, 1996; accepted Dec. 19, 1996.
Catherine S. Woolley1,
Nancy G. Weiland2,
Bruce S. McEwen2, and
Philip A. Schwartzkroin1
1 Department of Neurological Surgery, University of
Washington, Seattle, Washington 98195, and 2 Laboratory of
Neuroendocrinology, The Rockefeller University, New York, New York
10021
Previous studies have shown that estradiol induces new dendritic
spines and synapses on hippocampal CA1 pyramidal cells. We have
assessed the consequences of estradiol-induced dendritic spines on CA1
pyramidal cell intrinsic and synaptic electrophysiological properties.
Hippocampal slices were prepared from ovariectomized rats treated with
either estradiol or oil vehicle. CA1 pyramidal cells were recorded and
injected with biocytin to visualize spines. The association of
dendritic spine density and electrophysiological parameters for each
cell was then tested using linear regression analysis. We found a
negative relationship between spine density and input resistance;
however, no other intrinsic property measured was significantly
associated with dendritic spine density. Glutamate receptor
autoradiography demonstrated an estradiol-induced increase in binding
to NMDA, but not AMPA, receptors. We then used input/output (I/O)
curves (EPSP slope vs stimulus intensity) to determine whether the
sensitivity of CA1 pyramidal cells to synaptic input is correlated with
dendritic spine density. Consistent with the lack of an estradiol effect on AMPA receptor binding, we observed no relationship between the slope of an I/O curve generated under standard recording
conditions, in which the AMPA receptor dominates the EPSP, and spine
density. However, recording the pharmacologically isolated NMDA
receptor-mediated component of the EPSP revealed a significant
correlation between I/O slope and spine density. These results indicate
that, in parallel with estradiol-induced increases in spine/synapse
density and NMDA receptor binding, estradiol treatment increases
sensitivity of CA1 pyramidal cells to NMDA receptor-mediated synaptic
input; further, sensitivity to NMDA receptor-mediated synaptic input is
well correlated with dendritic spine density.
Key words:
estradiol;
dendritic spines;
hippocampal slice;
CA1
pyramidal cells;
biocytin;
autoradiography;
NMDA receptor
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B. Moosmann and C. Behl
The antioxidant neuroprotective effects of estrogens and phenolic compounds are independent from their estrogenic properties
PNAS,
August 3, 1999;
96(16):
8867 - 8872.
[Abstract]
[Full Text]
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B. S. McEwen
Permanence of brain sex differences and structural plasticity of the adult brain
PNAS,
June 22, 1999;
96(13):
7128 - 7130.
[Full Text]
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Y. I. Sheline, M. Sanghavi, M. A. Mintun, and M. H. Gado
Depression Duration But Not Age Predicts Hippocampal Volume Loss in Medically Healthy Women with Recurrent Major Depression
J. Neurosci.,
June 15, 1999;
19(12):
5034 - 5043.
[Abstract]
[Full Text]
[PDF]
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B. S. McEwen and S. E. Alves
Estrogen Actions in the Central Nervous System
Endocr. Rev.,
June 1, 1999;
20(3):
279 - 307.
[Abstract]
[Full Text]
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X.-Y. He, G. Merz, P. Mehta, H. Schulz, and S.-Y. Yang
Human Brain Short Chain L-3-Hydroxyacyl Coenzyme A Dehydrogenase Is a Single-domain Multifunctional Enzyme. CHARACTERIZATION OF A NOVEL 17beta -HYDROXYSTEROID DEHYDROGENASE
J. Biol. Chem.,
May 21, 1999;
274(21):
15014 - 15019.
[Abstract]
[Full Text]
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P. Miranda, C. L. Williams, and G. Einstein
Granule Cells in Aging Rats Are Sexually Dimorphic in Their Response to Estradiol
J. Neurosci.,
May 1, 1999;
19(9):
3316 - 3325.
[Abstract]
[Full Text]
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L. D. Pozzo-Miller, T. Inoue, and D. D. Murphy
Estradiol Increases Spine Density and NMDA-Dependent Ca2+ Transients in Spines of CA1 Pyramidal Neurons From Hippocampal Slices
J Neurophysiol,
March 1, 1999;
81(3):
1404 - 1411.
[Abstract]
[Full Text]
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B. S. McEwen, P. Tanapat, and N. G. Weiland
Inhibition of Dendritic Spine Induction on Hippocampal CA1 Pyramidal Neurons by a Nonsteroidal Estrogen Antagonist in Female Rats
Endocrinology,
March 1, 1999;
140(3):
1044 - 1047.
[Abstract]
[Full Text]
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M. R. Foy, J. Xu, X. Xie, R. D. Brinton, R. F. Thompson, and T. W. Berger
17beta -Estradiol Enhances NMDA Receptor-Mediated EPSPs and Long-Term Potentiation
J Neurophysiol,
February 1, 1999;
81(2):
925 - 929.
[Abstract]
[Full Text]
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E. Morikawa, H. Mori, Y. Kiyama, M. Mishina, T. Asano, and T. Kirino
Attenuation of Focal Ischemic Brain Injury in Mice Deficient in the epsilon 1 (NR2A) Subunit of NMDA Receptor
J. Neurosci.,
December 1, 1998;
18(23):
9727 - 9732.
[Abstract]
[Full Text]
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A. Shimada, C. A. Mason, and M. E. Morrison
TrkB Signaling Modulates Spine Density and Morphology Independent of Dendrite Structure in Cultured Neonatal Purkinje Cells
J. Neurosci.,
November 1, 1998;
18(21):
8559 - 8570.
[Abstract]
[Full Text]
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D. D. Murphy, N. B. Cole, V. Greenberger, and M. Segal
Estradiol Increases Dendritic Spine Density by Reducing GABA Neurotransmission in Hippocampal Neurons
J. Neurosci.,
April 1, 1998;
18(7):
2550 - 2559.
[Abstract]
[Full Text]
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J. H. Morrison and P. R. Hof
Life and Death of Neurons in the Aging Brain
Science,
October 17, 1997;
278(5337):
412 - 419.
[Abstract]
[Full Text]
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M. Yankova, S. A. Hart, and C. S. Woolley
From the Cover: Estrogen increases synaptic connectivity between single presynaptic inputs and multiple postsynaptic CA1 pyramidal cells: A serial electron-microscopic study
PNAS,
March 13, 2001;
98(6):
3525 - 3530.
[Abstract]
[Full Text]
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W. Krezel, S. Dupont, A. Krust, P. Chambon, and P. F. Chapman
Increased anxiety and synaptic plasticity in estrogen receptor beta -deficient mice
PNAS,
October 9, 2001;
98(21):
12278 - 12282.
[Abstract]
[Full Text]
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R. Bi, M. R. Foy, R.-M. Vouimba, R. F. Thompson, and M. Baudry
Cyclic changes in estradiol regulate synaptic plasticity through the MAP kinase pathway
PNAS,
November 6, 2001;
98(23):
13391 - 13395.
[Abstract]
[Full Text]
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