Abstract
Hormones are chemical mediators that act on target tissues at a distance from the endocrine glands that produce them. Hormones are classified according to their chemical structure in peptides/proteins and steroid hormones. Most hormones belong to the peptide/protein class, are hydrophilic, circulate in the bloodstream in their free form, and interact with membrane receptors, except for thyroid hormones. Steroid and thyroid hormones are lipophilic and need carrier proteins to increase their solubility in plasma, and bind to intracellular receptors. Membrane receptors are classified as receptors coupled to guanine-binding proteins (G-proteins), receptor tyrosine kinases, and receptors coupled to ion channels. Intracellular receptors bind to the DNA of target genes and regulate transcription by interacting with other transcription factors that stimulate or repress gene transcription.
Hormone bioavailability depends on the rate of secretion, the concentration of free hormones, and the metabolic clearance rate (MCR). Only free hormones are accessible to interaction with the receptor, and metabolic clearance. Three systems are involved in the control of hormone levels: the central nervous system through autonomic input, the endocrine system in feedback loops, and different ions or nutrients specific to the different hormones.
Body homeostasis of water and electrolytes are under the complex regulation of several hormones: antidiuretic (ADH) or arginine-vasopressin (AVP), which regulates total body water and osmolality in extracellular fluid (ECF); aldosterone, and the renin-angiotensin system (RAAS), which regulate the total mass of sodium and potassium; and insulin and natriuretic atrial peptide (ANP), which control the influx and outflux of potassium from the intracellular fluid, and the excretion of sodium, respectively. The main target for ADH/AVP, aldosterone, and ANP is the distal nephron, although ADH/AVP and the RAAS also regulate other systems, like thirst (ADH/AVP) and vascular tone (RAAS).
This chapter aims to review the basic concepts of the function and regulation of the endocrine system and its involvement in the maintenance of water and electrolyte homeostasis.
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Russo-Picasso, M.F., Springer, E. (2023). Hormones. In: Musso, C.G., Covic, A. (eds) Organ Crosstalk in Acute Kidney Injury. Springer, Cham. https://doi.org/10.1007/978-3-031-36789-2_3
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