View Single Post
  #1  
Old 07-11-2018, 05:41 AM
basskiller's Avatar
basskiller basskiller Is Off Line
Administrator

 
Join Date: Jan 2004
Location: Bodybuilding heaven
Posts: 125,764
Thanks: 3,387
Thanked 18,378 Times in 10,667 Posts
Rep Power: 3960
basskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond reputebasskiller has a reputation beyond repute
rss Inhibition of cytochrome P450 enzymes by thymoquinone in human liver microsomes.

Inhibition of cytochrome P450 enzymes by thymoquinone in human liver microsomes.

Saudi Pharm J. 2018 Jul;26(5):673-677

Authors: Albassam AA, Ahad A, Alsultan A, Al-Jenoobi FI

Abstract
The aim of the present study was to investigate the potential effect of thymoquinone (TQ) on the metabolic activity of four major drug metabolizing enzymes in human liver microsomes, namely cytochrome P450 (CYP) 1A2, CYP2C9, CYP2D6 and CYP3A4. The inhibition of CYP enzymatic activities by TQ was evaluated by incubating typical substrates (phenacetin for CYP1A2, tolbutamide for CYP2C9, dextromethorphan for CYP2D6, and testosterone for CYP3A4) with human liver microsomes and NADPH in the absence or presence of TQ (1, 10 and 100 ÁM). The respective metabolite of the substrate that was formed was measured by HPLC. Results of the presented study presented that the metabolic activities of all the investigated CYP enzymes, viz. CYP1A2, CYP2C9, CYP2D6 and CYP3A4, were inhibited by TQ. At 1 ÁM TQ, CYP2C9 enzyme activity was maximally inhibited by 46.35%, followed by CYP2D6 (20.26%) > CYP1A2 (13.52%) > CYP3A4 (12.82%). However, at 10 ÁM TQ, CYP2C9 enzyme activity was maximally inhibited by 69.69%, followed by CYP3A4 (23.59%) > CYP1A2 (23.51%) > CYP2D6 (11.42%). At 100 ÁM TQ, CYP1A2 enzyme activity was maximally inhibited by 81.92%, followed by CYP3A4 (79.24%) > CYP2C9 (69.22%) > CYP2D6 (28.18%). The IC50 (mean ▒ SE) values for CYP1A2, CYP2C9, CYP2D6 and CYP3A4 inhibition were 26.5 ▒ 2.9 ÁM, 0.5 ▒ 0.4 ÁM, >500 ÁM and 25.2 ▒ 3.1 ÁM, respectively. These findings suggest that there is a high probability of drug interactions resulting from the co-administration of TQ or herbs containing TQ with drugs that are metabolized by the CYP enzymes, particularly CYP2C9.


PMID: 29989011 [PubMed]



This is an automated post
__________________

W C B B Sponsors
Southern Sarms

Beyondsupplements
Myprotein.com
Strength.com
i-Supplements
A1Supplements.com
PowderCity.com
BulkSupplements.com
Egg Whites International <---100% Bio-Available Egg White Protein


Remember... Any advice given on this board is just an opinion and not to be taken as medical advice. WCBB doesn't advocate or condone use of steroids. Check the laws in your country. WCBB just provides the platform in which to discuss such matters
Reply With Quote
Get your liquid egg whites here at EGG WHITES INTERNATIONAL