Brain sex differences and hormone influences: a moving experience?
S Tobet1, J G Knoll, C Hartshorn
1Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA. stuart.tobet@colostate.edu
Journal of Neuroendocrinology
|February 12, 2009
Summary
Early life factors, including genetics and hormones, shape sex differences in the brain. Cell migration in the developing hypothalamus is a key mechanism influenced by hormones, impacting sexual differentiation.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- Sex differences in the nervous system are widespread but often manifest later in life.
- Mechanisms driving these differences frequently operate during critical perinatal developmental periods.
- Both genetic and hormonal factors are implicated in the ontogeny of sexually dimorphic brain characteristics.
Purpose of the Study:
- To explore the molecular and cellular mechanisms underlying early-life sexual differentiation of the brain.
- To identify potential molecular biomarkers of sexual differentiation.
- To investigate the role of cell migration in hormone-mediated brain development.
Main Methods:
- Review of existing literature on neurodevelopmental sex differences.
- Analysis of molecular pathways involved in cell development and differentiation (neurogenesis, cell migration, apoptosis, etc.).
- Examination of the influence of steroid hormones on cellular processes, including cell migration in vitro.
Main Results:
- Sexual differentiation of the brain involves multiple processes including neurogenesis, cell migration, differentiation, death, axon guidance, and synaptogenesis.
- Molecular factors include transcription factors and effector molecules involved in cell signaling.
- Sex differences may be revealed by genetic or environmental disruptions, not solely by direct hormone action.
Conclusions:
- Cell migration is a critical, early target for molecular actions that influence brain development and sexual differentiation.
- Hormonal influences on cell migration, particularly in the developing hypothalamus, are significant.
- Further research is needed to understand the function of identified biomarkers in sexual differentiation.
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