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How do hormone receptors make target tissues respond to hormones?
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Endocrine system
The glands of the human endocrine system.
Hormone receptors enable target tissues to respond to hormones through a process of specific binding and subsequent intracellular signaling. Because each receptor possesses a high affinity for a particular hormone, only tissues containing the appropriate receptors can respond to that hormone.1
When a hormone binds to its receptor, it forms a hormone-receptor complex that triggers a chain of chemical responses within the target cell. This process, known as receptor-effector coupling, typically occurs through one of the following mechanisms:1
- Enzyme Activation: The complex may activate enzymes within the cell, such as adenylate cyclase, which produces intracellular messengers like cAMP. These messengers regulate various cellular activities, including muscle contraction and cell division.2
- Gene Expression: For steroid hormones, the hormone-receptor complex often interacts directly with DNA in the cell nucleus to stimulate or inhibit protein synthesis.12
- Ion Channel Regulation: The receptor may directly control ion channels in the cell membrane, altering the cell's electrical potential.2
These actions ensure that hormonal effects are precisely targeted rather than general throughout the body.1