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The perinatal ontogeny of estrogen receptor-immunoreactivity in the developing male and female rat hypothalamus
R J Pasterkamp1, K Yuri, D T Visser
1Department of Anatomy and Neurobiology, Kyoto Prefectural University of Medicine, Japan.
Insights
Estrogen receptor (ER) expression in the developing rat hypothalamus shows region-specific onset. Sex differences in ER levels are detectable during the perinatal period, highlighting early neurodevelopmental sexual differentiation.
Area of Science:
- Neuroscience
- Endocrinology
- Developmental Biology
Background:
- The estrogen receptor (ER) plays a crucial role in brain development and function.
- Understanding the temporal and spatial expression patterns of ER is vital for comprehending neurodevelopmental processes.
- Sex differences in brain structure and function are established early in development, influenced by hormonal signaling.
Purpose of the Study:
- To investigate the developmental expression patterns of the estrogen receptor (ER) in the rat hypothalamus.
- To determine the onset of ER protein expression in specific hypothalamic nuclei during the perinatal period.
- To identify potential sex differences in ER expression during early development.
Main Methods:
- Immunohistochemistry was employed to detect ER-immunoreactivity in rat hypothalamic tissue.
- Tissue samples were collected at specific developmental stages (E17 and E19) during the perinatal period.
- Quantitative analysis of ER protein expression was performed in distinct hypothalamic nuclei.
Main Results:
- Estrogen receptor (ER) protein expression was detected as early as embryonic day 17 (E17) in the medial preoptic nucleus and ventromedial nucleus.
- ER protein expression in the periventricular preoptic nucleus and arcuate nucleus was initiated later, at embryonic day 19 (E19).
- Region-specific onset of ER expression was observed, with detectable sex differences in ER levels during the perinatal period.
Conclusions:
- Estrogen receptor (ER) expression in the rat hypothalamus is initiated in a region-specific manner during development.
- Sex differences in ER levels emerge during the perinatal period, coinciding with the differential onset of ER expression.
- These findings contribute to understanding the early neuroendocrine mechanisms underlying sexual differentiation of the brain.
Abstract:
Developmental expression of the estrogen receptor (ER) in rat hypothalamus was examined using immunohistochemistry. In the medial preoptic nucleus and ventromedial nucleus ER-immunoreactivity was detected as early as E17, whereas ER protein expression in the periventricular preoptic nucleus and arcuate nucleus was delayed until E19. These results show that following a region specific onset of the ER protein expression sex differences in ER levels are already detectable during the perinatal period.