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Corticosterone effects on rat brain template active region chromatin
Pharmacology, Biochemistry, and Behavior
|February 1, 1980
Summary
Prenatal exposure to corticosterone delayed brain chromatin development in rat offspring. This prenatal stressor impacted gene expression, affecting brain development and temporarily altering body and brain weight.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- Prenatal exposure to stress hormones, such as corticosterone, can impact offspring neurodevelopment.
- Understanding the effects of maternal stress on fetal brain development is crucial for identifying potential long-term health consequences.
Purpose of the Study:
- To investigate the effects of prenatal corticosterone exposure on the developing rat brain chromatin.
- To determine if prenatal corticosterone administration alters developmental trajectories of brain gene expression and physical growth.
Main Methods:
- Pregnant Fischer inbred rats received corticosterone or saline injections on Days 17 and 18 of gestation.
- Offspring were assessed at birth (Day 0) and at 2, 3, 4, and 6 days of age.
- Measurements included brain chromatin status, body weight, and brain weight.
Main Results:
- Prenatal corticosterone exposure caused a 24-hour delay in a key developmental peak of brain template active region chromatin.
- While overall brain and body weights were similar between groups, corticosterone led to a transient decrease in both at 2 days of age.
- These weight differences were reversed by 6 days of age.
Conclusions:
- Prenatal exposure to corticosterone significantly impacts the epigenetic programming of the developing brain.
- The findings suggest that maternal stress hormones can alter gene expression patterns during critical developmental windows.
- These epigenetic modifications may have implications for brain development and function in offspring.