sensagent's content

  • definitions
  • synonyms
  • antonyms
  • encyclopedia

Dictionary and translator for handheld

⇨ New : sensagent is now available on your handheld

   Advertising ▼

sensagent's office

Shortkey or widget. Free.

Windows Shortkey: sensagent. Free.

Vista Widget : sensagent. Free.

Webmaster Solution

Alexandria

A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Give contextual explanation and translation from your sites !

Try here  or   get the code

SensagentBox

With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. Choose the design that fits your site.

Business solution

Improve your site content

Add new content to your site from Sensagent by XML.

Crawl products or adds

Get XML access to reach the best products.

Index images and define metadata

Get XML access to fix the meaning of your metadata.


Please, email us to describe your idea.

WordGame

The English word games are:
○   Anagrams
○   Wildcard, crossword
○   Lettris
○   Boggle.

Lettris

Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.

boggle

Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !

English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).

Copyrights

The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
The web service Alexandria is granted from Memodata for the Ebay search.
The SensagentBox are offered by sensAgent.

Translation

Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.

last searches on the dictionary :

3647 online visitors

computed in 0.047s

   Advertising ▼


 » 

Wikipedia

Hyperforin

                   
Hyperforin
Identifiers
CAS number 11079-53-1 N
ChemSpider 16736597 YesY
UNII RM741E34FP YesY
DrugBank DB01892
KEGG C07608 YesY
ChEBI CHEBI:5834 YesY
ChEMBL CHEMBL1237210 N
Jmol-3D images Image 1
Properties
Molecular formula C35H52O4
Molar mass 536.78 g/mol
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Hyperforin is a phytochemical produced by some of the members of the plant genus Hypericum, notably Hypericum perforatum (St John's wort).

Contents

  Occurrence

Hyperforin has only been found in significant amounts in Hypericum perforatum (St. John's wort) with other species such as Hypericum calycinum (Greater St. John's wort or Aaron's beard) containing lower levels of the phytochemical. It is thought to be a monoamine oxidase inhibitor (MAOI).[1] It accumulates in oil glands, pistils, and fruits, probably as a plant defense against herbivory.[2] Other Hypericum species contain low amounts of hyperforin.[3]

  Chemistry

The structure of hyperforin was elucidated by a research group from the Shemyakin Institute of Bio-organic Chemistry (USSR Academy of Sciences in Moscow) and published in 1975.[4][5] Hyperforin is a prenylated phloroglucinol derivative. An enantioselective total synthesis of hyperforin was reported in 2010.[6]

Hyperforin is unstable in the presence of light and oxygen.[7]

  Pharmacology

Hyperforin is believed to be the primary active constituent responsible for the antidepressant and anxiolytic properties of the extracts of St. John's wort.[8] It acts as a reuptake inhibitor of monoamines, including serotonin, norepinephrine, dopamine, and of GABA and glutamate, with IC50 values of 0.05-0.10 mcg/mL for all compounds, with the exception of glutamate, which is in the 0.5 mcg/mL range.[9] Hyperforin also inhibits the reuptake of glycine[10] and choline,[11]. It appears to exert these effects by activating the transient receptor potential ion channel TRPC6.[12] Activation of TRPC6 induces the entry of sodium and calcium into the cell which causes inhibition of monoamine reuptake.[12]

Hyperforin is also thought to be responsible for the induction of the cytochrome P450 enzymes CYP3A4 and CYP2C9 by binding to and activating the pregnane X receptor (PXR).[13]

Some pharmacokinetic data on hyperforin is available for an extract containing 5% hyperforin. Maximal plasma levels (Cmax) in human volunteers were reached 3.5h after administration of an extract containing 14.8 mg hyperforin. Biological half-life (t½) and mean residence time were 9h and 12h respectively with an estimated steady state plasma concentration of 100 ng/mL (approx. 180 nM/L) for 3 doses/d. Linear plasma concentrations were observed within a normal dosage range and no accumulation occurred.[14]

Hyperforin has been found to be a potent inhibitor of COX-1 and 5-LO with IC50 values of 0.3μM and 90nM respectively. Giving it an anti-inflammatory action of approximately 3-18 times stronger than aspirin.[15]

  Reuptake Inhibition

Neurotransmitter IC50 (μM)
5-HT 0.205 ± 0.045
Norepinephrine 0.080 ± 0.024
Dopamine 0.102 ± 0.019
GABA 0.184 ± 0.041
L-Glutamate 0.829 ± 0.687

  Antibiotic

Hyperforin has antibiotic properties and is active against methicillin-resistant strains of Staphylococcus aureus (MRSA) with a minimal inhibitory concentration (MIC) value of 1.0 μg/mL,[16] as well as against other gram-positive bacteria.[17]

  See also

  Further reading

  References

  1. ^ Umek A, Kreft S, Kartnig T, Heydel B (May 1999). "Quantitative phytochemical analyses of six hypericum species growing in slovenia". Planta medica 65 (4): 388–90. DOI:10.1055/s-2006-960798. PMID 17260265. 
  2. ^ Beerhues L. (2006). “Hyperforin.” Phytochemistry 67 (20): 2201-7. PMID 16973193
  3. ^ Smelcerovic A, Spiteller M (March 2006). "Phytochemical analysis of nine Hypericum L. species from Serbia and the F.Y.R. Macedonia". Die Pharmazie 61 (3): 251–2. PMID 16599273. 
  4. ^ Bystrov NS, Gupta ShR, Dobrynin VN, Kolosov MN, Chernov BK (January 1976). "[Structure of the antibiotic hyperforin]" (in Russian). Doklady Akademii Nauk SSSR 226 (1): 88–90. PMID 1248360. 
  5. ^ Bystrov NS, Chernov BK, Dobrynin VN, Kolosov MN (1975). "[The structure of hyperforin]". Tetrahedron Letters 16 (32): 2791–2794. DOI:10.1016/S0040-4039(00)75241-5. 
  6. ^ Shimizu Y, Shi S-L, Usuda H, Kanai M, Shibasaki M (February 2010). "Catalytic Asymmetric Total Synthesis of ent-Hyperforin". Angew Chem Int Ed 49 (6): 1103–6. DOI:10.1002/anie.200906678. 
  7. ^ Liu F, Pan C, Drumm P, Ang CY (February 2005). "Liquid chromatography-mass spectrometry studies of St. John's wort methanol extraction: active constituents and their transformation". Journal of pharmaceutical and biomedical analysis 37 (2): 303–12. DOI:10.1016/j.jpba.2004.10.034. PMID 15708671. 
  8. ^ Newall, Carol A.; Joanne Barnes; Anderson, Linda R. (2002). Herbal medicines: a guide for healthcare professionals. London: Pharmaceutical Press. ISBN 0-85369-474-5. 
  9. ^ Chatterjee SS, Bhattacharya SK, Wonnemann M, Singer A, Müller WE (1998). "Hyperforin as a possible antidepressant component of hypericum extracts". Life Sci. 63 (6): 499–510. DOI:10.1016/S0024-3205(98)00299-9. PMID 9718074. 
  10. ^ Marsh WL, Davies JA (October 2002). "The involvement of sodium and calcium ions in the release of amino acid neurotransmitters from mouse cortical slices elicited by hyperforin". Life Sciences 71 (22): 2645–55. PMID 12354583. http://linkinghub.elsevier.com/retrieve/pii/S0024320502021045. 
  11. ^ Buchholzer ML, Dvorak C, Chatterjee SS, Klein J (May 2002). "Dual modulation of striatal acetylcholine release by hyperforin, a constituent of St. John's wort". The Journal of Pharmacology and Experimental Therapeutics 301 (2): 714–9. PMID 11961077. http://jpet.aspetjournals.org/cgi/pmidlookup?view=long&pmid=11961077. 
  12. ^ a b Leuner K, Kazanski V, Müller M, et al. (December 2007). "Hyperforin--a key constituent of St. John's wort specifically activates TRPC6 channels". The FASEB journal : official publication of the Federation of American Societies for Experimental Biology 21 (14): 4101–11. DOI:10.1096/fj.07-8110com. PMID 17666455. 
  13. ^ Moore LB, Goodwin B, Jones SA, et al. (June 2000). "St. John's wort induces hepatic drug metabolism through activation of the pregnane X receptor". Proceedings of the National Academy of Sciences of the United States of America 97 (13): 7500–2. DOI:10.1073/pnas.130155097. PMC 16574. PMID 10852961. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=16574. 
  14. ^ Biber A, Fischer H, Römer A, Chatterjee SS. (1998). “Oral bioavailability of hyperforin from hypericum extracts in rats and human volunteers.” Pharmacopsychiatry 31 Suppl 1:36-43. PMID 9684946
  15. ^ Albert D, Zündorf I, Dingermann T, Müller WE, Steinhilber D, Werz O. (December 2002). "Hyperforin is a dual inhibitor of cyclooxygenase-1 and 5-lipoxygenase". Biochemical Pharmacology. 15;64(12):1767-75. PMID: 12445866
  16. ^ Reichling J, Weseler A, Saller R (July 2001). "A current review of the antimicrobial activity of Hypericum perforatum L". Pharmacopsychiatry 34 Suppl 1: S116–8. DOI:10.1055/s-2001-15514. PMID 11518059. 
  17. ^ Schempp CM, Pelz K, Wittmer A, Schöpf E, Simon JC (June 1999). "Antibacterial activity of hyperforin from St John's wort, against multiresistant Staphylococcus aureus and gram-positive bacteria". Lancet 353 (9170): 2129. DOI:10.1016/S0140-6736(99)00214-7. PMID 10382704. 
   
               

 

All translations of Hyperforin


   Advertising ▼