Cited by 40Hypothalamic control of reproductive hormonesCircadian rhythm and melatoninEstrogen and related hormone effects

Effects of ovariectomy on the binding of [125I]-αbungarotoxin (2.2 and 3.3) to the suprachiasmatic nucleus of the hypothalamus: An in vivo autoradiographic analysis

Miller, Marilyn M., Silver, Jerry, Billiar, Reinhart B.·1982·Brain Research

Abstract

alpha-Bungarotoxin (alpha-BTX) has been used to label receptor binding sites on neural membranes. alpha-BTX fractions 2.2 and 3.3 were purified from Bungarus multicinctus by the method of Ravdin and Berg (1979) and we iodinated. There was no difference between these two fractions in their binding affinity or specificity of binding with hypothalamic synaptosomes. [125I] alpha-BTX 2.2S, 3.3 and commercially obtained [125I] alpha-BTX were injected into the third ventricle of ovariectomized female rats (n = 22), normally cycling rats (n = 12) or normal male rats (n = 4) and autoradiographic examination performed. Saline injected hypothalami (n = 4) or hypothalamus. Examination of serial sections from animals injected with each [125I] alpha-BTX showed that the supraoptic, periventricular, arcuate, premamillary and mamillary nuclei were consistently labeled. While the suprachiasmatic nucleus (SCN) in the intact females and males both showed high densities of alpha-BTX binding, the SCN in ovariectomized females showed little or no alpha-BTX binding. Thus, the labeling of the SCN in females without ovaries and ovarian hormones was markedly different from that of the intact males and females. Labeling patterns in castrate and intact animals may contribute to our understanding of gonadal steroid regulation of hypothalamic function.

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Crossref · 10.1016/0006-8993(82)91261-6

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48 of 48 references verified0 citation errors · 0 not checkable

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  • In females, gonadal hormones can increase the sensitivity of the SCN to cholinergic inputs.

    “In females gonadal hormones can also increase the sensitivity of the SCN to cholinergic inputs (ACh; [96, 117, 118]), which are thought to potentially mediate the influence of cognition (sustained attention) on chronotype [63].”

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Authors
Miller, M. M., Silver, J., & Billiar, R. B.
Affiliations
Case Western Reserve University (US)
Venue
Brain Research
Publisher
Elsevier BV
Published
1982-09
Volume
247
Issue
2
Pages
355-364
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2160470364
Cited by
40
References
48
Citations by year
2024: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2019: 1 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 1 · 2012: 1
FWCI
1.43
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
Keywords
ovariectomy, alpha-bungarotoxin binding, suprachiasmatic nucleus, hypothalamus, ovarian hormones, hypothalamic neurons, third ventricle injection, sex differences, castration
MeSH terms
Animals, Autoradiography, Bungarotoxins, Castration, Female, Hypothalamus, Male, Ovary, Receptors, Nicotinic, Sex Factors, Structure-Activity Relationship, Suprachiasmatic Nucleus, Synaptosomes, Rats

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