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Steroid hormones are multifunctional messengers to the brain
1Laboratory of Neuroendocrinology, Rockefeller University, New York, NY 10021, USA.
Trends in Endocrinology and Metabolism: TEM
|March 1, 1991
Summary
The brain and endocrine system interact, meaning environmental changes and experiences shape hormone-sensitive nerve cells. Steroid hormones can impact the nervous system, potentially influencing individual brain function and behavior.
Area of Science:
- Neuroendocrinology
- Hormone Action
- Behavioral Neuroscience
Background:
- The brain regulates and responds to the endocrine system.
- Environmental factors and life experiences can alter neuroendocrine function.
- Steroid hormones exert diverse effects on the nervous system.
Purpose of the Study:
- To explore the bidirectional relationship between the brain and endocrine system.
- To investigate how external stimuli and physiological status modulate neuroplasticity.
- To understand the role of steroid hormones in shaping neural properties and behavior.
Main Methods:
- Analysis of neuroendocrine feedback loops.
- Examination of cellular and molecular changes in hormone-sensitive neurons.
- Behavioral assessments in response to hormonal fluctuations.
Main Results:
- Demonstrated that environmental and experiential factors modify neuronal sensitivity to hormones.
- Showcased that steroid hormone effects on the nervous system are context-dependent, ranging from trophic to damaging.
- Highlighted the plasticity of neural circuits under endocrine influence.
Conclusions:
- The interplay between the brain and endocrine system is crucial for adapting to changing environments.
- Steroid hormones play a significant role in determining individual differences in brain function and behavior.
- Further research into steroid-brain interactions may elucidate the biological basis of unique animal traits.
Related Concept Videos
Major Hormones and Their Functions
Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
Types of Hormones
Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
Types of Hormones
Hormones are classified into four main groups: steroids, eicosanoids, amino acid-based derivatives, and peptide hormones.
Steroids and eicosanoids fall under the category of lipid-soluble hormones. Steroids are derived from cholesterol and feature four interconnected carbon rings with variable side chains. Notable examples include estradiol from ovaries and testosterone from testes, exemplifying the critical roles of these lipid-soluble hormones in reproductive physiology. Eicosanoids, derived...
Steroids and eicosanoids fall under the category of lipid-soluble hormones. Steroids are derived from cholesterol and feature four interconnected carbon rings with variable side chains. Notable examples include estradiol from ovaries and testosterone from testes, exemplifying the critical roles of these lipid-soluble hormones in reproductive physiology. Eicosanoids, derived...
Endocrine Signaling
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
Endocrine Signaling
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
Target Cell Response to Hormones
Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...

