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Topic: Antidiuretic hormone

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  Peptide hormone - Wikipedia, the free encyclopedia
Peptide hormones are a class of peptides that are secreted into the blood stream and have endocrine functions in living animals.
Peptide hormone precursors (pre-prohormones) are then processed in several stages, typically in the endoplasmic reticulum, including removal of the N-terminal signal sequence and sometimes glycosylation, resulting in prohormones.
Mature peptide hormones then diffuse through the blood to all of the cells of the body, where they interact with specific receptors on the surface of their target cells.
en.wikipedia.org /wiki/Peptide_hormone   (230 words)

 Antidiuretic Hormone (Vasopressin)
Antidiuretic hormone, also known as vasopressin, is a nine amino acid peptide secreted from the posterior pituitary.
Antidiuretic hormone stimulates water reabsorbtion by stimulating insertion of "water channels" or aquaporins into the membranes of kidney tubules.
Another potent stimulus of antidiuretic hormone is nausea and vomiting, both of which are controlled by regions in the brain with links to the hypothalamus.
arbl.cvmbs.colostate.edu /hbooks/pathphys/endocrine/hypopit/adh.html   (781 words)

 AllRefer.com - hormone (Biochemistry) - Encyclopedia   (Site not responding. Last check: 2007-11-05)
Normally, various hormones are produced and secreted by the endocrine glands (see endocrine system), including the pituitary, thyroid, parathyroids, adrenals, ovaries, testes, pancreatic islets, certain portions of the gastrointestinal tract, and the placenta, among the mammalian species.
The hormones of the anterior pituitary include thyrotropin, adrenocorticotropic hormone, the gonadotropic hormones, and growth hormone; the posterior pituitary secretes antidiuretic hormone, prolactin, and oxytocin.
Plants, too, have a hormonal system, which includes the auxins, the gibberellins, the cytokinins, and substances associated with the formation of flowers, tubers, bulbs, and buds.
reference.allrefer.com /encyclopedia/H/hormone.html   (484 words)

 Antidiuretic hormone - Wikipedia, the free encyclopedia
Antidiuretic hormone (ADH), or arginine vasopressin (AVP), is a peptide hormone produced by the hypothalamus, and stored in the posterior part of the pituitary gland.
ADH acts on the kidneys, concentrating the urine by promoting the reabsorption of water from the cortical collecting duct.
Raised ADH (syndrome of inappropriate antidiuretic hormone) and resultant hyponatremia occurs in brain diseases and conditions of the lungs.
en.wikipedia.org /wiki/Antidiuretic_hormone   (484 words)

 e-Hormone.com: Hormones, endocrine system, glands, actions   (Site not responding. Last check: 2007-11-05)
Hormones are chemical signaling molecules (peptides, proteins or steroids) produced in one site of the body that then travel to another site to have an effect.
Hormones may be made and have an action locally or may be made in one endocrine gland and have an effect at a distant site.
Antidiuretic hormone (ADH) and oxytocin are stored there within the terminal processes of neurons until the signal to release them is received.
www.e-hormone.com   (2871 words)

 Antidiuretic Hormone (Adh) Test | AHealthyMe.com
Antidiuretic hormone (ADH) test, also called the Vasopressin test, is a test for the antidiuretic hormone, which is released from the pituitary gland and acts on the kidneys to increase their reabsorption of water into the blood.
A metabolic disorder in which the pituitary gland produces inadequate amounts of antidiuretic hormone (ADH) or the kidneys are unable to respond to release of the hormone.
The pituitary gland is sometimes referred to as the "master gland." As the most important of the endocrine glands (glands which release hormones directly into the bloodstream), it regulates and controls not only the activities of other endocrine glands but also many body processes.
www.ahealthyme.com /topic/topic100586445   (576 words)

 THE MERCK MANUAL--SECOND HOME EDITION, Central Diabetes Insipidus in Ch. 162, Pituitary Gland Disorders
Antidiuretic hormone is unique in that it is produced in the hypothalamus but is then stored and released into the bloodstream by the pituitary gland.
Alternatively, the disorder may be caused by failure of the pituitary gland to release antidiuretic hormone into the bloodstream.
The diagnosis of central diabetes insipidus is confirmed if, in response to antidiuretic hormone, the person's excessive urination stops, the urine becomes more concentrated, the blood pressure rises, and the heart beats more normally.
www.merck.com /mrkshared/mmanual_home2/sec13/ch162/ch162d.jsp   (525 words)

 s010701c - Syndrome of Inappropriate Antidiuretic Hormone (SIADH) - Idiopathic or Unknown Origin
Abstract: OBJECTIVE: To determine the prevalence of syndrome of inappropriate antidiuretic hormone secretion (SIADH) among older hyponatremic patients in a subacute geriatric facility, to identify patients with no apparent cause for the SIADH (idiopathic SIADH), and to determine their clinical characteristics.
Abstract: OBJECTIVE: To determine clinical characteristics of elderly patients presenting with the syndrome of inappropriate antidiuretic hormone secretion (SIADH), their outcome, and the extent of evaluation that is warranted.
The pattern of antidiuretic hormone release corresponded to the "vasopressin leak" pattern.
www.emory.edu /WHSCL/grady/amreport/litsrch02/s020701c.html   (985 words)

 The Facts About Diabetes Insipidus   (Site not responding. Last check: 2007-11-05)
The hormone is necessary to maintain a proper water balance within the body's cells and blood.
Without normal secretion of the antidiuretic hormone, vasopressin, the kidneys lose excessive water ("polyuria"), causing increased concentration of the blood and dehydration, which leads to excessive thirst.
Diabetes insipidus is caused by the lack of antidiuretic hormone (vasopressin), and sugar diabetes is caused by lack of the hormone insulin.
histio.org /association/library/diabetes.shtml   (893 words)

 [No title]   (Site not responding. Last check: 2007-11-05)
To prospectively document the true incidence of the syndrome of inappropriate antidiuretic hormone secretion and hyponatremia, and identify risk and protective factors for the development of the syndrome of inappropriate antidiuretic hormone secretion after spinal surgery.
The etiology of hyponatremia was the syndrome of inappropriate antidiuretic hormone secretion in seven patients (6.9%), hypovolemia in 19 patients (18%), and other causes in six patients.
Spine patients are at risk for hyponatremia and the syndrome of inappropriate antidiuretic hormone secretion.
www.espineinstitute.com /Docs/Abstracts/HyponatremiaAndSyndromeOfInappropriateAntidiureticHormoneSecretionInAdultSpinalSurgery.htm   (233 words)

 American College of Medical Toxicology
Anti-diuretic hormone release and suppression, as well as thirst, are important factors in the daily regulation of plasma tonicity.
Whether users of the drug have increased anti-diuretic hormone secretion in response to hypovolemia or due to the direct effect of the drug on anti-diuretic hormone secretion, or both, ingestion of solute-free water will lead to hyponatremia if anti-diuretic hormone secretion is not suppressed.
Treatment of syndrome of inappropriate antidiuretic hormone secretion with saline infusion can lead to worsening of hyponatremia, since the administered salt can be excreted in a concentrated urine, while solute-free water is retained.
www.ijmt.net /ijmt/3_5/3_5_30.html   (1300 words)

 Hormones of the Pituitary
The alpha chain is identical to that found in two other pituitary hormones, FSH and LH as well as in the hormone chorionic gonadotropin.
Synthesis and release of FSH is triggered by the arrival from the hypothalamus of gonadotropin-releasing hormone (GnRH).
The GH-secreting cells are stimulated to synthesize and release GH by the intermittent arrival of growth hormone releasing hormone (GHRH) from the hypothalamus.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/P/Pituitary.html   (1333 words)

 AllRefer.com - antidiuretic hormone (Biochemistry) - Encyclopedia
antidiuretic hormone[an´´tEdIyOOret´ik] Pronunciation Key, polypeptide hormone secreted by the posterior pituitary gland.
Antidiuretic hormone (ADH), known also as vasopressin, causes the kidneys to resorb water directly from the renal tubules, thus concentrating the salts and waste products in the liquid, which will eventually become urine.
ADH secretion by the pituitary is regulated by neural connections from the hypothalamus, which is believed to monitor either the volume of blood passing through it or the concentration of water in the blood.
reference.allrefer.com /encyclopedia/A/antidiur.html   (244 words)

 antidiuretic hormone on Encyclopedia.com   (Site not responding. Last check: 2007-11-05)
Agent improves quality of life in nocturia sufferers: in older patients, antidiuretic drug reduces nocturnal voiding by more than 50%.
Replacement therapy: arginine vasopressin (AVP), growth hormone (GH), cortisol, thyroxine, testosterone and estrogen.
Antidiuretic hormone reduces nocturnal voiding in men : One-third of those receiving desmopressin see a 50% or more reduction in nightly voids.
www.encyclopedia.com /html/a1/antidiur.asp   (437 words)

 Antidiuretic Hormone (ADH, Vasopressin)
Antidiuretic hormone (ADH) is normally produced in the neurohypophysis to regulate plasma osmolality.The characteristic syndrome due to ADH hypersecretion was first described in 1957 by Schwartz.The two key features of this syndrome are hyponatremia with hyposmolarity and inappropriately concentrated urine.Hyponatremia associated with lung malignancy is commonly due to inappropriate secretion of ADH.
The most important physiological action of AVP is that it increases water reabsorption by the kidneys by increasing water permeability in the collecting duct, thereby permitting the formation of a more concentrated urine.
This hormone also constricts arterial blood vessels; however, the normal physiological concentrations of AVP are below its vasoactive range.
www.greatvistachemicals.com /nutritional-supplements/antidiuretic-hormone.html   (400 words)

 Lancaster General Hospital - Syndrome of Inappropriate Antidiuretic Hormone Sec   (Site not responding. Last check: 2007-11-05)
SIADH occurs when excessive levels of antidiuretic hormones (hormones that help the kidneys, and body, conserve the correct amount of water) are produced.
The syndrome causes the body to retain water and certain levels of electrolytes in the blood to fall (such as sodium).
In other cases, a certain cancer (elsewhere in the body) may produce the antidiuretic hormone, especially certain lung cancers.
www.lancastergeneral.org /content/greystone_22236.asp   (357 words)

 Antidiuretic Hormone Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-11-05)
Looking For antidiuretic hormone - Find antidiuretic hormone and more at Lycos Search.
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www.variedtastes.com /encyclopedia/Antidiuretic_hormone   (629 words)

 Hormones of the Hypothalamus
All of these are released into the blood in the capillaries and travel immediately – in portal veins – to a second capillary bed in the anterior lobe of the pituitary, where they exert their effects.
In fact, replacement hormone therapy with these hormones does not work unless the replacements are also given in spurts.
Somatostatin is also secreted by cells in the pancreas and in the intestine where it inhibits the secretion of a variety of other hormones.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/H/Hypothalamus.html   (403 words)

 p010701c - Syndrome of Inappropriate Antidiuretic Hormone (SIADH) - Idiopathic or Unknown Origin
Title: The syndrome of inappropriate antidiuretic hormone secretion of unknown origin.
Title: Inappropriate antidiuretic hormone secretion of unknown origin.
Biochemical investigations revealed serum sodium 118 meq/liter, serum osmolality 238 mosmol/liter, urine sodium 90 meq/liter, urine osmolality 700 mosmol/liter, persistenly elevated serum antidiuretic hormone (ADH) levels (5.8 to 11.9 pg/ml) and no obvious cause for the hypertension.
www.emory.edu /WHSCL/grady/amreport/litsrch02/p020701c.html   (215 words)

 University of Miami School of Medicine - Glossary - Antidiuretic hormone (ADH)
Antidiuretic hormone (ADH): A relatively small (peptide) molecule that is released by the pituitary gland at the base of the brain after being made nearby (in the hypothalamus).
ADH has an antidiuretic action that prevents the production of dilute urine (and so is antidiuretic).
A syndrome of inappropriate secretion of ADH results in the inability to put out dilute urine, perturbs fluid (and electrolyte) balance, and causes nausea, vomiting, muscle cramps, confusion and convulsions.
www.med.miami.edu /glossary/art.asp?articlekey=7000   (130 words)

 Lancaster General Hospital - Posterior Pituitary Disorders   (Site not responding. Last check: 2007-11-05)
The posterior (back) lobe of the pituitary gland releases ADH (antidiuretic hormone) and oxytocin (a hormone to contract the uterus during childbirth and stimulate milk production).
Antidiuretic hormone (ADH), which is also called vasopressin, helps the kidneys (and body) conserve the right amount of water.
Lack of ADH leads to too much excretion of water (diabetes insipidus), and too much ADH leads to excessive retention of water by the body (syndrome of inappropriate antidiuretic hormone secretion).
www.lancastergeneral.org /content/greystone_22234.asp   (173 words)

 eMedicine - Syndrome of Inappropriate Antidiuretic Hormone Secretion : Article by Jose F Pascual-y-Baralt, MD   (Site not responding. Last check: 2007-11-05)
Background: The syndrome of inappropriate antidiuretic hormone (SIADH) secretion is the most common cause of euvolemic hyponatremia in pediatrics.
The syndrome is defined by the hyponatremia and hypoosmolality resulting from inappropriate continued secretion and/or action of antidiuretic hormone (ADH) despite normal or increased plasma volume.
Manoogian C, Pandian M, Ehrlich L: Plasma atrial natriuretic hormone levels in patients with the syndrome of inappropriate antidiuretic hormone secretion.
www.emedicine.com /ped/topic2190.htm   (5436 words)

 Chlorpropamide upregulates antidiuretic hormone receptors and unmasks constitutive receptor signaling -- Durr et al. ...
Antidiuretic hormone (ADH) saturation binding studies in membranes from control and chlorpropamide (CP)-treated cells.
This puzzling phenomenon is reminiscent of the antidiuretic state that arises during chronic infusions of peptidic ADH antagonist
Relationship between hormonal occupancy of neurohypophyseal hormone receptor and adenylate cyclase activation.
ajprenal.physiology.org /cgi/content/full/278/5/F799   (6535 words)

Oxytocin differs from antidiuretic hormone in two of the nine amino acids.
Both hormones are packaged into granules and secreted along with carrier proteins called neurophysins.
Another well-studied effect of steroid hormones is the marked increase in synthesis of uterine (myometrial) oxytocin receptors late in gestation, resulting from increasing concentrations of circulating estrogen.
arbl.cvmbs.colostate.edu /hbooks/pathphys/endocrine/hypopit/oxytocin.html   (924 words)

 Question_set 205   (Site not responding. Last check: 2007-11-05)
SIADH is a syndrome of inappropriate antidiuretic hormone secretion.
The antidiuretic effect causes excessive water retention, so that the urine sodium is inappropriately concentrated (greater than 20 mEq/L, when not sodium restricted), while the serum sodium concentration is low (less than 135 mEq/L).
Since this is a syndrome of inappropriate antidiuretic hormone secretion, which causes excessive water retention, the urine concentration is inappropriately high (greater than 100 mOsm/kg of water), while the plasma osmolality is low (less than 280 mOsm/kg).
www.ncemi.org /cgi-ncemi/qad.pl?cmd=showquestion&rf=/usr/www/htdocs/ncemi/qad/205.siadh.qad&rfj=8   (517 words)

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