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Articles

Sex differences and thyroid hormone sensitivity of hippocampal pyramidal cells

E Gould, A Westlind-Danielsson, M Frankfurt and BS McEwen
Journal of Neuroscience 1 March 1990, 10 (3) 996-1003; DOI: https://doi.org/10.1523/JNEUROSCI.10-03-00996.1990
E Gould
Laboratory of Neuroendocrinology, Rockefeller University, New York, New York 10021.
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A Westlind-Danielsson
Laboratory of Neuroendocrinology, Rockefeller University, New York, New York 10021.
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M Frankfurt
Laboratory of Neuroendocrinology, Rockefeller University, New York, New York 10021.
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BS McEwen
Laboratory of Neuroendocrinology, Rockefeller University, New York, New York 10021.
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Abstract

In an effort to determine if sex differences exist in the morphologic characteristics of pyramidal cells and granule cells of the hippocampal formation and whether sex plays a role in determining thyroid hormone sensitivity of these neuronal populations, we used single-section Golgi impregnation to examine the effects of neonatal thyroid hormone administration on hippocampal cells from the brains of adult rats of both sexes. Quantitative analyses of control brains revealed sex differences in the number of primary dendrites and the number of spines on the apical dendritic shaft of CA3 pyramidal cells. These differences showed opposite trends; females possessed more primary dendrites, whereas males showed more apical excrescences. Neonatal treatment with thyroid hormone resulted in long-lasting and dramatic changes of the entire CA3 pyramidal cell. CA3 pyramidal cells from thyroid hormone- treated animals showed significantly larger cell body areas, greater numbers of dendritic branchpoints, and longer dendrites. In addition, CA3 pyramidal cells from thyroid hormone-treated animals showed changes in the morphological characteristics which were shown to be sexually dimorphic; treatment resulted in significantly greater numbers of both primary dendrites and apical excrescences. These treatment differences occurred in both sexes and were of equal magnitude, regardless of sex. On the other hand, no sex differences in the morphologic parameters examined were detected for pyramidal cells in the CA1 region. Moreover, neonatal thyroid hormone treatment did not affect the cell body area, dendritic branch points, or the length of dendrites of these cells.(ABSTRACT TRUNCATED AT 250 WORDS)

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The Journal of Neuroscience: 10 (3)
Journal of Neuroscience
Vol. 10, Issue 3
1 Mar 1990
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Sex differences and thyroid hormone sensitivity of hippocampal pyramidal cells
E Gould, A Westlind-Danielsson, M Frankfurt, BS McEwen
Journal of Neuroscience 1 March 1990, 10 (3) 996-1003; DOI: 10.1523/JNEUROSCI.10-03-00996.1990

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Sex differences and thyroid hormone sensitivity of hippocampal pyramidal cells
E Gould, A Westlind-Danielsson, M Frankfurt, BS McEwen
Journal of Neuroscience 1 March 1990, 10 (3) 996-1003; DOI: 10.1523/JNEUROSCI.10-03-00996.1990
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