Steroid Hormones
Fundamentals of Endocrinology and Hormones
Steroid Hormones
Steroid hormones are cholesterol-derived signaling molecules with a characteristic fused-ring framework. Major families include glucocorticoids, mineralocorticoids, androgens, estrogens and progestogens, each with distinct biosynthetic enzymes and physiological roles.
Synthesis shapes availability
Classical steroidogenic cells regulate cholesterol delivery and sequential enzymatic reactions in mitochondria and the endoplasmic reticulum. They generally rely on synthesis and diffusion rather than large stores of finished hormone in secretory granules.
Delivery and action
Many steroids circulate bound to carrier proteins and albumin. Intracellular receptors regulate transcription, while some effects involve faster signaling pathways. Local conversion can strengthen, redirect or inactivate the circulating signal.
In the exercise setting
Cortisol participates in fuel regulation and stress responses, while sex steroids support reproductive and skeletal functions. A shared chemical structure does not imply equivalent actions. Endogenous physiological exposure should also be distinguished from the effects of externally administered anabolic steroids.
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