Hormonal regulation of epithelial transport of ions and water

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Published by New York Academy of Sciences in New York, N.Y .

Written in English

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Statementedited by Walter N. Scott and David B.P. Goodman.
SeriesAnnals of the New York Academy of Sciences -- v.372
ContributionsScott, Walter N., Goodman, David B. P., New York Academy of Sciences.
ID Numbers
Open LibraryOL22494941M
ISBN 100897661338

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Get this from a library. Hormonal regulation of epithelial transport of ions and water. [Walter N Scott; David B P Goodman;]. The cloning studies of the ion transporters and channels have led to an enormous increase in our understanding of the structure, function and regulation of epithelial transport.

A comparison of osmoregulatory hormones between terrestrial and Cited by: 1. Ann N Y Acad Sci. ; Hormonal regulation of epithelial transport of ions and water. [No authors listed] PMID: [PubMed - indexed for MEDLINE]. Abstract. In higher animals, the regulation of the ionic composition of the extracellular and intracellular fluids is critically dependent on the control of net rates of ion and water Cited by:   11 Mechanisms of Hormone Actions on Intestinal Transport I.

Introduction II. Ion Transport Processes in Vertebrate Intestine Hormonal regulation of epithelial transport of ions and water book. The Network of Intestinal Transport Regulation IV.

Endocrine Control of Intestinal Transport V. Conclusions References 12 Actions of Hormones on Salt and Water Transport across Cutaneous and Urinary Bladder EpitheliaBook Edition: 1. Epithelial Transport Physiology is directed to both basic and clinical scientists working in membrane transport and related areas, to graduate students and advanced undergraduates seeking a broad purview of the subject, and to other investigators and potential investigators seeking a vista of the new frontiers of molecular epithelial transporters.

In this model, sodium ion from the lumen (e.g., lumen of the GI tract or the kidney tubule) enters the apical side of the cell facing the lumen, crosses the cell to the basolateral side, and is exported from the cell, powered by a sodium/potassium ATPase (Derfoul et al.,Kolla and Litwack, ), to the extracellular space and finally to the bloodstream.

The characterization of the various ion transport phenomena substantiates this cell line as a model renal epithelium that can be used to study the hormonal and metabolic regulation of ion.

Any interaction between phytohormones and inorganic ion transport may change the ionic balance in plants and consequently growth may be affected. Since the ’s, a number of reports have accumulated in the literature concerning the effect of plant hormones on the uptake and transport of ions in a wide variety of excised plant tissues (Van.

There are two routes for transport of molecules and ions across the epithelium of the gut: Across the plasma membrane of the epithelial cells (transcellular route) Across tight junctions between epithelial cells (paracellular route) Some molecules, water for instance, are transported by both routes.

Facultative water Hormonal regulation of epithelial transport of ions and water book is regulated by ADH. Secondary active transport moves one ion with its electrochemical gradient while moving a second substance against its electrochemical gradient.

Sodium and glucose are reabsorbed in the proximal convoluted tubule via a symporter. Regulation of salt and water balance for homeostasis is essential for organisms. As a consequence of their dependence on water, amphibians regulate water and ion concentrations in their body via a.

In doing so, we attempted to identify associations between cord-blood hormones and gene expressions in preterm and term human infants.

Thus, we gathered nasal epithelial samples at birth and on the first day postnatally to determine the gene expression of the molecules involved in the airway epithelial ion and fluid transport. Purchase Water Relations in Membrane Transport in Plants and Animals - 1st Edition.

Print Book & E-Book. ISBNMy research is focused on hormonal regulation of epithelial ion transport, particularly in the kidney, and how this impinges on blood pressure control.

When I attended my first Physiological Society Main Meeting during my PhD I was fortunate enough to be introduced to the very welcoming Epithelia and Membrane Transport Theme. THE EPITHELIAL NA + channel (ENaC) forms a pathway for the transport of Na + across a variety of epithelia.

The rate of Na + transport must vary dramatically to maintain Na + and volume homeostasis in the face of extremes of Na + intake.

Thus, ENaC function is tightly regulated. In contrast to voltage- and ligand-gated ion channels, which are regulated through rapid changes in channel opening. Na+ and K+ ions are reabsorbed by active transport. Negatively charged ions are attracted to positively charged ions (passive transport).

As the concentration of ions (solute) increases in plasma, osmotic pressure increases. Water (70%) moves from renal tubule to capillary by osmosis (passive transport). The amounts of water and ions reabsorbed into the circulatory system are carefully regulated and this is an important way the body regulates its water content and ion levels.

The waste is collected in larger tubules and then leaves the kidney in the ureter, which leads to the bladder where urine, the combination of waste materials and water, is. The principal cell of the kidney collecting duct is one of the most highly regulated epithelial cell types in vertebrates.

The effects of hormonal, autocrine, and paracrine factors to regulate principal cell transport processes are central to the maintenance of fluid and electrolyte balance in the face of wide variations in food and water intake. A very important function of epithelial tissues is the transport of substances into or out of the animal body.

All substances that enter or leave the animal body must cross an epithelium. Through this transport capacity epithelia contribute to many fundamental physiological processes of animals.

Calcium ions are believed to play an important role in the control of cellular function 1, and have recently been implicated in the regulation of sodium and water transport in epithelia 2– 1) Regulation of water inorganic ion balance and acid-base balance 2) Removal of metabolic waste products from blood and their excretion in the urine 3) Removal of foreign chemicals from the blood and their excretion in urine 4) Gluconeogenesis~ kidneys synthesize glucose from amino acid and release into blood 5) Produce/release hormones and.

Renal epithelial Na + transport plays an important role in homeostasis of our body fluid content and blood pressure. Further, the Na + transport in alveolar epithelial cells essentially controls the amount of alveolar fluid that should be kept at an appropriate level for normal gas exchange.

The epithelial Na + > transport is generally mediated through two steps: (1) the entry step of Na. Epithelial ion transport is regulated in vertebrates by a variety of hormonal and non-hormonal factors, including mineralocorticoids, insulin, and osmotic shock.

SGK1 has been established as an important convergence point for multiple regulators of Na+transport. The body contains a large variety of ions, or electrolytes, which perform a variety of functions. Some ions assist in the transmission of electrical impulses along cell membranes in neurons and muscles.

Other ions help to stabilize protein structures in enzymes. Still others aid in releasing hormones from endocrine glands. active absorption or secretion of these ions by epithelial tissues like the colon and distal renal tubule. Alterations in electrolyte balance brought about by circulating hormones, pathological states, or drugs reflect the actions of these agents on specific transport processes in the apical and basolateral membranes of epithelial cells.

Tubular secretion. Tubular secretion is responsible for moving substances, e.g., H + and K + ions, from peritubular capillaries into tubular lumen by diffusion or transcellular mediated transport. Some of the movements are coupled to reabsorption of Na + ions.

Tubule cells can synthesize glucose, ammonia, etc. and add it to blood as needed. The central goal of this overview article is to summarize recent findings in renal epithelial transport,focusing chiefly on the connecting tubule (CNT) and the cortical collecting duct (CCD).Mammalian CCD and CNT are involved in fine-tuning of electrolyte and fluid balance through reabsorption and secretion.

Hormonal Regulation of Osmoregulation in Mammals. The information below was adapted from OpenStax Biology While the kidneys operate to maintain osmotic balance and blood pressure in the body, they also act in concert with hormones. Hormones are. The secretions of endocrine glands are called hormones.

Hormones are released into the interstitial fluid, diffused into the bloodstream, and delivered to targets, in other words, cells that have receptors to bind the hormones.

The endocrine system is part of a major regulatory system coordinating the regulation and integration of body responses. The enzyme, carbonic anhydrase, catalyzes the formation of cellular HCO 3 −-ions from carbon dioxide and water.

The HCO 3-ions are then carried out into the uterine fluid by special transporter proteins, the solute carriers. These HCO 3 −-ions eventually combine with the free Ca-ions in the fluid bathing the egg to make calcite crystals.

BASIC TRANSPORT COMPONENTS OF ANION SECRETION. Marine biology has made significant contributions to the study of epithelial ion transport. Key among them is a series of experiments performed in the late s by the Danish physiologist and Nobel Laureate August Krogh, using the skin and gills of freshwater animals.

Regulation of alveolar transepithelial sodium transport. Studies in vitro have indicated that there is usually parallel independent regulation of apically localised sodium transport processes and basolaterally located Na + /K +-ATPase in response to a variety of stimuli, including hormones, such as catecholamines, dopamine, glucocorticoids, thyroid hormone and insulin, and growth factors (fig.

It is well established that active sodium-ion transport and water flow across isolated toad bladder are increased by antidiuretic hormone (ADH) and by cAMP. These agents were also observed in previous studies to cause changes in the amount of radioactive phosphate in a specific protein in the toad bladder.

Thus hormonal regulation of the type and quantity of water channels in this epithelium might control water transport in the oviductal lumen. the fluid produced and secreted by epithelial cells of the oviduct provides a physiological medium for fertilization and facilitates ovum transport toward the uterus and early embryonic development.

Aquaporin 1 is a protein that in humans is encoded by the AQP1 gene. AQP1 is a widely expressed water channel, whose physiological function has been most thoroughly characterized in the is found in the basolateral and apical plasma membranes of the proximal tubules, the descending limb of the loop of Henle, and in the descending portion of the vasa recta.

Glucose, water, salts, ions, and amino acids needed by the body are filtered in one part of the kidney. This filtrate, which includes glucose, is then reabsorbed in another part of the kidney. Because there are only a finite number of carrier proteins for glucose, if more glucose is present than the proteins can handle, the excess is not.

Professional Summary: Regulation of Kidney Epithelial Cell Growth, Transport and Differentiation Our laboratory is investigating the molecular mechanisms by which hormones, growth factors and extracellular matrix proteins regulate kidney tubule epithelial cell growth and functional differentiation in vitro.

An established canine kidney epithelial cell line, MDCK, and isolated "mutants". Water permeability of proximal tubule is always very high, reabsorbs water molecules almost as rapidly as sodium ions Water permeability of the cortical and medullary collecting ducts can vary greatly due to physiological control by a peptide hormone secreted by the.

Hormonal Regulation of the Excretory System. Maintaining a proper water balance in the body is important to avoid dehydration or over-hydration (hyponatremia). The water concentration of the body is monitored by osmoreceptors in the hypothalamus, which detect the concentration of electrolytes in the extracellular fluid.

Bicarbonate ions are generated by the mechanism illustrated below: Carbon dioxide and water enter the cell and combine to form carbonic acid under the influence of the enzyme carbonic anhydrase. Hydrogen ions are actively secreted on the basal side of the cell in exchange for sodium.

Regulation of Absorption. Absorption in the gastrointestinal tract is regulated by neuroendocrine mechanisms. In the colon endocrine mechanisms used include: Aldosterone – increases the net absorption of water and electrolytes by stimulating the basolateral sodium-potassium ATP-ase.

This increases the electrochemical gradient and driving force for sodium absorption.the amiloride-sensitive epithelial Na + channel (ENaC) plays a central role in the reabsorption of salt and fluids across Na +-reabsorbing epithelia such as the distal nephron, distal colon, lungs, and ducts of the exocrine is rate limiting for net Na + reabsorption because it mediates entry of Na + from the luminal fluid during the first stage of electrogenic Na + transport (1, 9).

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