OBJECTIVETo explore the interaction between herbal medicines and western drugs based on CYP3A4 enzyme metabolism by using testotesrone as a probe in liver microsome metabolism system in vitro.

METHODThe mixed liver microsome enzymatic system consisting of rat liver microsomes by ultra-high-speed centrifuge was established. The substrate testosterone was added into the system and enzyme CYP3A4 metabolic activity was expressed by the output of 6beta-hydroxy-testosterone which was measured by HPLC method. The proper conditions for testotesrone metabolism in liver microsome system included substrate concentration, incubation time, pH and incubation temperature. When the conditions in vitro were determined, three kinds of Chinese herbal medicinal ingredients (Tetrahydropalmatine, neferine, panax notoginseng saponins) were diluted into different concentrations and incubated with testotesrone in the liver microsomes incubation system, respectively. The results were measured through metabolite production with or without the presence of Chinese medicines. We assessed the Chinese herbal medicinal ingredients effect on the metabolism of CYP3A4 enzyme through 6beta-hydroxy metabolite of testosterone production.

RESULTLiver microsomes were incubated in the system, the testosterone metabolited into 6beta-hydroxy testosterone. The metabolism conditions were proper at the concentration of testosterone 200 micromol x L(-1) which was incubated for 3.5 hours at 37 degrees C in pH 7.0, PBS 0.1 mol x L(-1). The inhibition of tetrahydropalmatine and panax notoginseng saponins on testotesrone were weak with IC50 > 100 micromol x L(-1). The neferine had a little inhibition on testotesrone metabolism, IC50 < 100 micromol L(-1).

CONCLUSIONTetrahydropalmatine and panax notoginseng saponins had no obvious effect on testotesrone metabolism. Neferine had a little effect on testotesrone metabolism. It prompted that drug-interaction could not be apparent between two kinds of Chinese medicines and the CYP3A4 enzyme substrate, Neferine could bring about drug-interaction.

Animals ; Cytochrome P-450 CYP3A ; Cytochrome P-450 Enzyme System ; metabolism ; Drug Interactions ; Drugs, Chinese Herbal ; analysis ; pharmacokinetics ; Male ; Microsomes, Liver ; chemistry ; drug effects ; enzymology ; Rats ; Rats, Wistar ; Testosterone ; analysis ; pharmacokinetics

Tai Chi and Qigong (TCQ) are regarded as major therapies of complementary and alternative medicine (CAM), and welcomed by increasing practitioners worldwide for their efficacy in various health issues. To better learn about the popularity of TCQ in the United States, the related data collected from 2007, 2012 and 2017 questionnaires of the National Health Interview Survey (NHIS) were examined and analyzed. The result showed that adult TCQ practitioners in the US increased substantially from 2007-2017, the percentage of Tai Chi practitioners in adult population was 1.0% in 2007, and Qigong practitioners 0.3%; Tai Chi practitioners was 1.1% in 2012, and Qigong practitioners 0.3%; in 2017, Tai Chi practitioners was 1.5%, and Qigong practitioners 0.5%. The top three reasons for using TCQ were: 82.4% for general wellness or disease prevention, 64.6% to improve or enhance energy, and 35.1% recommended by family, friends or co-workers. The health benefits of TCQ, the demand for complementary therapies and increasing research evidences were positive factors for the growth, while there are also challenges including insufficiencies in scientific researches and lacking of standardized teaching system. To promote the future development of TCQ in the US and oversea countries, we should optimize the research methods and standardize the teaching system, encourage the exchange and training of TCQ related professionals, and promote the integration of TCQ into conventional medical system and other related industries.