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Topic: Cyclic AMP


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In the News (Sat 16 Dec 17)

  
 Cyclic adenosine monophosphate - Wikipedia, the free encyclopedia
Cyclic adenosine monophosphate (cAMP, cyclic AMP or 3'-5'-cyclic adenosine monophosphate) is a molecule that is important in many biological processes; it is derived from adenosine triphosphate (ATP).
Cyclic AMP is involved in some protein kinases.
Cyclic AMP binds to specific locations on the regulatory units of the protein kinase, and causes dissociation between the regulatory and catalytic subunits, thus activating the catalytic units and enabling them to phosphorylate substrate proteins.
en.wikipedia.org /wiki/Cyclic_AMP   (411 words)

  
 Videos   (Site not responding. Last check: 2007-11-07)
Single Dictyostelium cell exposed to a cyclic AMP gradient from a micropipette.
Single molecule imaging of the binding of CY3-cyclic AMP to the basal surface of a cell.
Cells were exposed to a sudden increase in cyclic AMP (white flash).
www.hopkinsmedicine.org /cellbio/devreotes/videos.htm   (595 words)

  
 cyclic AMP ELISA (Regular & Direct) > cyclic AMP Assay Kit > Assay Designs   (Site not responding. Last check: 2007-11-07)
A number of hormones are known to activate cyclic AMP through the action of the enzyme adenylate cyclase which converts ATP to cyclic AMP.
Because cyclic AMP has been shown to be involved in the cardiovascular and nervous systems, immune mechanisms, cell growth and differentiation, and general metabolism, there remains considerable interest in the measurement of intracellular concentrations in tissues and cell cultures.
The investigation of cyclic AMP may help to provide a clearer understanding of the physiology and pathology of many disease states.
www.assaydesigns.com /products/catalog/immuno_assay/product_cAMP.htm   (303 words)

  
 8N3cAMP Uses   (Site not responding. Last check: 2007-11-07)
Cyclic AMP is also involved in controlling gene expression and cell division, in immune responses, and in nervous transmission.
Adenylyl cyclase is the enzyme that synthesizes cyclic adenosine monophosphate or cyclic AMP from adenosine triphosphate (ATP).
Cyclic AMP functions as a "second messenger" to relay extracellular signals to intracellular effectors such as protein kinase A, and regulation of intracellular concentrations of cyclic AMP is largely a result in controlling adenylyl cyclase.
www.altcorp.com /AffinityLabeling/8n3campuses.htm   (3379 words)

  
 Cyclic AMP and Its Action   (Site not responding. Last check: 2007-11-07)
Cyclic AMP is a small cyclized monophosphate and it is produced from ATP by the enzyme adenylate cyclase.
Cyclic AMP is converted to AMP by the action of the enzyme phosphodiesterase.
Cyclic AMP binds to the apical Cl channel and allows it to open — water is drawn osmotically across the cell into the lumen also and so water is excreted via the feces.
fig.cox.miami.edu /~lfarmer/BIL265/CAMP.HTM   (814 words)

  
 Cyclic AMP   (Site not responding. Last check: 2007-11-07)
Cyclic Vomiting/Abdominal Migraines Pediatrician responds to question on cyclic vomiting in Questions and Answers section of ParentsPlace.com.
Cyclic Vomiting Syndrome CVS is a childhood disorder characterized by bouts of vomiting that last from a few hours to several days.
Cyclic Vomiting Syndrome CVS is an uncommon, unexplained disorder of children and some adults that is characterized by recurrent, prolonged episodes of severe nausea, vomiting and prostration with no apparent cause.
www.serebella.com /encyclopedia/article-Cyclic_AMP.html   (288 words)

  
 cyclic amp   (Site not responding. Last check: 2007-11-07)
Cyclic adenosine monophosphate (cAMP, or 3'-5'-cyclic adenosine monophosphate) is derived from adenosine triphosphate (ATP).
cAMP decomposition into AMP is catalyzed by the enzyme phosphodiesterase.
This enzyme is inhibited by caffeine, the stimulatory efffect of this drug being the result of the raised cAMP levels that it causes.
www.yourencyclopedia.net /Cyclic_AMP.html   (296 words)

  
 Ion Channel Literature - Short term and long term effects of beta-adrenergic effectors and cyclic AMP on ...   (Site not responding. Last check: 2007-11-07)
The effects of short term stimulation of beta-adrenergic receptors and elevations in intracellular cyclic AMP on nitrendipine-sensitive voltage-dependent Ca2+ channels of skeletal muscle cells in vitro has been studied using both the 45Ca2+ flux technique and [3H] nitrendipine-binding experiments.
This increase was accompanied by a 4-10-fold decrease in the affinity of the receptors for nitrendipine.
The results are discussed in relation to the role of beta-adrenergic receptors and intracellular cyclic AMP in the regulation of skeletal muscle Ca2+ channels.
www.ionchannels.org /showabstract.php?pmid=2414273   (300 words)

  
 UNODC - Bulletin on Narcotics - 1977 Issue 2 - 002
In mice the reduction of brain cyclic AMP levels by either propranolol or imidazole increased the duration and intensity of action of a single injection of morphine (Contreras, Castillo and Quijada, 1972).
Since cyclic AMP is thought to be involved in the mediation of noradrenergic transmission, drugs which affect monoamine metabolism have been studied in animals concomitantly receiving cyclic AMP.
Conversely, cyclic AMP injections failed to alter the analgesic dose of morphine after brain norepinephrine levels were increased by administration of dihydroxyphenylserine.
www.unodc.org /unodc/fr/bulletin/bulletin_1977-01-01_2_page003.html   (1691 words)

  
 cAMP
Adenosine 3':5'-cyclic monophosphate (cyclic AMP, cAMP) is an important second messanger involved in signal transdustion, gene regulation, steroid hormone biosynthesis and intracellular signaling.
Cyclic AMP-dependent protein kinases can then be activated resulting in phosphorylation of substrate proteins.
Quantifacation of Cyclic AMP levels may aid in understanding the mechanisms of action of a variety of hormones and biologically active substances
www.oxfordbiomed.com /ea50camp.html   (102 words)

  
 Cyclic guanosine monophosphate   (Site not responding. Last check: 2007-11-07)
Cyclic guanosine monophosphate (cGMP) is a second messenger derived from GTP.
Cyclic guanosine monophosphate (cGMP) is a cyclic nucleotide derived from guanosine triphosphate (GTP).
cGMP acts as a second messenger much like cyclic AMP most notably by activating intracellular protein kinases in response to the binding of membrane -impermeable peptide hormones to the external cell surface.
www.freeglossary.com /Cyclic_GMP   (379 words)

  
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The concentration of cyclic AMP in both infarcted and noninfarcted area 60 min after the ligation of the proximal part of the left anterior descending coronary artery to significantly higher than in sham-operated control animals.
When propranolol was given, the concentration of cyclic AMP of both infarcted and noninfarcted area remained at control level.
Cyclic AMP-dependent and cyclic AMP-independent antagonism of insulin activation of cardiac glycogen synthase.
www.pharmacy-online-usa.com /ref-propranolol/propranolol-research-abs3.1661.html   (693 words)

  
 Cyclic AMP and GMP
Lewin, E. and Bleck, V., Cyclic AMP accumulation in cerebral cortical slices: effect of carbamazepine, phenobarbital and phenytoin, Epilepsia, 18(2): 237-42, 1977.
In mouse cerebral cortex slices, PHT reduced the increase in cyclic AMP induced by norepinephrine, adenosine and ouabain.
Folbergrova, J., Cyclic GMP and cyclic AMP in the cerebral cortex of mice during seizures induced by 3-mercaptopropionic acid: effect of anticonvulsant agents, Neurosci.
www.remarkablemedicine.com /Clinical/basicmechanisms/neurotransmitter/cyclicamp.html   (1062 words)

  
 Earl Sutherland
It was at that time that he isolated a previously unknown chemical, called cyclic AMP, and proved that it functioned in an intermediary role in many hormonal functions.
Sutherland showed for the first time that hormones did not send their messages regarding digestive, reproductive, or metabolic functions directly to the target organs but, instead, they activated the cyclic AMP and it was that chemical that told the organs what to do.
Further research showed cyclic AMP also was instrumental in the transmission of genetic information and in abnormal cell growth.
www.kshs.org /portraits/sutherland_earl.htm   (411 words)

  
 Tramadol, buy tramadol, antibiotics, Weight Loss drugs, weight loss herbs, weight loss herbal formula, weight loss, ...   (Site not responding. Last check: 2007-11-07)
Phenylephrine-induced cyclic AMP accumulation was blocked by the beta-adrenergic receptor antagonists propranolol and atenolol.
The accumulation of cyclic AMP could be inhibited by specific antagonists: propranolol inhibited the isoproterenol-mediated stimulation while diphenhydramine and metiamide inhibited the histamine response.
Efflux of cyclic AMP into the extracellular medium was found to be a function of the intracellular cyclic AMP levels over a wide range of concentrations.
www.online-pharmacy-usa.net /ref-propranolol/propranolol-research-abs3.1448.html   (692 words)

  
 cyclic GMP ELISA (Regular & Direct) > cyclic GMP Assay Kit > Assay Designs   (Site not responding. Last check: 2007-11-07)
Assay Designs´ Direct cyclic GMP (cGMP) kit is designed for use with tissue samples that have been grown in tissue culture media.
Guanosine 3´, 5´-cyclic monophosphate (cyclic GMP; cGMP) was identified in 1963.
It has been shown to be present at levels typically 10 to 100 fold lower than cyclic AMP in most tissues and is formed by the action of the enzyme guanylate cyclase on GTP.
www.assaydesigns.com /products/catalog/immuno_assay/product_cGMP.htm   (286 words)

  
 [How can we improve the efficacy of morphine analgesia without increasing adverse effects?] Is SDZ NVI-085 an alpha ...   (Site not responding. Last check: 2007-11-07)
Inhibition of cyclic AMP accumulation by alpha 2-adrenoceptors in the rat cerebral cortex.
The effects of alpha 2-adrenoceptor agonist and antagonists on the accumulation of cyclic AMP were examined in rat cerebral cortex slices.
Yohimbine (10(-7)-10(-5) M), an alpha 2-adrenoceptor antagonist, intensified the cyclic AMP response to norepinephrine by 30%, whereas, clonidine, an alpha 2-adrenoceptor agonist, decreased the response.
www.dreampharmaceuticals.com /ref-clonidine/clonidine-research-abs3.1666.html   (618 words)

  
 Simple Chemical Switch Steers Migrating Neurons
The researchers found that two key signaling chemicals, cyclic AMP and cyclic GMP, located in the growth cone, act as switches.
In contrast, a different repulsive signal became attractive when cyclic AMP was added to the growing neurons.
Cyclic AMP and cyclic GMP levels are controlled by other factors in the growth cone's ever-changing external environment.
www.eurekalert.org /pub_releases/1998-09/HHMI-SCSS-040998.php   (755 words)

  
 Cyclic AMP and furosemide stimulate the Na
Cyclic AMP and furosemide stimulate the Na(+)-K(+) ATPase in isolated rat jejunal cells.
The effect of cAMP on the activity of Na(+)-K(+) ATPase in the rat jejunum was studied by measuring the ouabain-sensitive (86)Rb accumulation by isolated villus cells.
The cyclic nucleotide increased significantly (86)Rb accumulation by the enterocytes.
www.aub.edu.lb /~sawkreyd/cyclic_amp_and_furosemide_stimul.htm   (223 words)

  
 Co-ordinated changes in the cyclic AMP signalling system and the phosphorylation of two nuclear proteins of Mr 130,000 ...
Co-ordinated changes in the cyclic AMP signalling system and the phosphorylation of two nuclear proteins of Mr 130,000 and 110,000 during proliferative stimulation of the rat parotid gland by isoprenaline.
Our results suggest that nucleolin and pp135 are nuclear target proteins of cyclic AMP in the cyclic AMP-influenced regulation of the transition of cells from the G1 to the S phase.
Administration of the beta-antagonist propranolol 8 h after the injection of isoprenaline suppressed the increase in DNA synthesis, the preceding changes in the concentration of cyclic AMP and in the activity of cyclic AMP-dependent protein kinase, as well as the increased phosphorylation of p110 and p130.
www.ihop-net.org /UniPub/iHOP/gp/866.html   (323 words)

  
 prostaglandin from On-line Medical Dictionary
All of the prostaglandins act by binding to specific cell surface receptors causing an increase in the level of the intracellular second messenger cyclic AMP (and in some cases cyclic GMP also).
The effect produced by the cyclic AMP increase depends on the specific cell type.
Increased cyclic AMP increases prostaglandin synthesis leading to further increases in cyclic AMP.
cancerweb.ncl.ac.uk /cgi-bin/omd?query=prostaglandin   (398 words)

  
 New tool highlights activity of key cellular signal
But because cyclic AMP uses just a handful of proteins to pass on many messages, scientists have had a hard time figuring out how it can trigger the right cellular response to each one.
Stimulating cyclic AMP production in a human embryonic kidney cell line containing the targeted fluorescent Epac proteins caused an immediate build-up of cyclic AMP and activation of Epac at the cell membrane, where cyclic AMP is produced, the researchers report.
Within seconds, build-up of cyclic AMP also began in the cytoplasm of the cell, the nucleus and the mitochondria.
www.eurekalert.org /pub_releases/2004-11/jhmi-nth111504.php   (759 words)

  
 Bioline International Official Site (site up-dated regularly)
To verify the relationship between intracellular cyclic AMP and inhibition of eosinophil migration, we measured the levels of this nucleotide in eosinophils.
Nevertheless, it should be considered that the slight increase in the eosinophil cyclic AMP may be dependent on (i) the rapid/transient nature of cyclic AMP level changes, (ii) its extrusion to the extracellular environment and (iii) compartimentalization of cyclic nucleotide alterations (Vegesna & Diamond, 1984).
Considering the effect of the cell permeable cyclic nucleotide analogues, we observed that either PAF or LTB4 was at best inhibited to only 60% after high concentration (100 uM), supporting the idea that there is not always a direct association between the suppression of biological responses and elevation of cyclic AMP levels.
www.bioline.org.br /request?oc97187   (2032 words)

  
 Cyclic AMP Diffusion Coefficient in Frog Olfactory Cilia -- Chen et al. 76 (5): 2861 -- Biophysical Journal
Cyclic AMP (cAMP) is one of the intracellular messengers that mediate odorant signal transduction in vertebrate olfactory
Diffusion coefficient of the cyclic GMP analog, 8-(fluoresceinyl) thioguanosine 3',5'-cyclic monophosphate in the salamander rod outer segment.
Contribution of the ciliary cyclic nucleotide-gated conductance to olfactory transduction in the salamander.
www.biophysj.org /cgi/content/full/76/5/2861   (4074 words)

  
 New tool highlights activity of key cellular signal
For example, the main enzyme that degrades cyclic AMP is being targeted by drug companies for potential application in inflammation, allergy, asthma or chronic lung disease, conditions that may be helped by increasing cyclic AMP.
More recently, altered regulation of cyclic AMP has been tied to the risk of stroke occurrence and to heart conditions including dilated cardiomyopathy.
Zhang says her lab will use the new and other fluorescent probes to study the role of cyclic AMP in smooth muscle cells, such as those in blood vessels, in inflammation, and in fat cells, where it may be involved in diabetes-related processes.
www.medicalnewstoday.com /medicalnews.php?newsid=16422&nfid=hww   (799 words)

  
 Dr. Schilling's Net Health Book - Cyclic AMP
According to Sears cyclic AMP levels are chronically diminished by elevated insulin levels, which puts a damper on a multitude of hormone systems (Ref.1).
Thyroid hormone will not be released into the blood stream without cyclic AMP and the sleep inducing melatonin hormone will not be produced from serotonin without cyclic AMP.
As a result your cyclic AMP levels may be chronically lower than normal changing certain hormone functions..." Bad for business, so it is not done.
www.nethealthbook.com /cyclicamp.html   (660 words)

  
 Drosophila gene families: Cyclic AMP second messenger system - The learning pathway
The cyclic AMP second messenger system is often called the learning pathway.
Changes in Ca++ ion levels can result in activation of the cyclic AMP pathway, or, in the case of K+ channels, can result in increased neuronal activity and increase in synaptic structure and branching.
Just as the cyclic AMP pathway is involved in learning, it is also involved in determining the strength of the neuromuscular junction.
www.sdbonline.org /fly/aignfam/camplern.htm   (550 words)

  
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Transient activation of cyclic AMP-dependent protein kinase and phosphorylase during the cardiac cycle in the canine myocardium in situ and the effect of propranolol.
The activity ratio of cyclic AMP-dependent protein kinase and glycogen phosphorylase were determined at various stages of the contraction cycle in the canine heart in situ.
This paper describes the inverse relationship between the cellular levels of cyclic AMP and the degranulation in pure culture of mast cells in response to aqueous cotton bract extracts of glanded and glandless varieties.
www.pharmacy-online-usa.com /ref-propranolol/propranolol-research-abs3.1655.html   (399 words)

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