Abstract
In the study, it was hypothesized that Rhubarb Anthraquinones synergistically enhanced the purgative effect on constipation rat from the direct and indirect pathway at the same time. A validated HPLC method was successfully applied to elucidate the synergism mechanism from pharmacokinetics aspect after oral administration of Rhubarb extract with a dose of 0.25 g to normal and constipation rats. Comparison of the pharmacokinetic data of normal and constipation rats showed that there were significant differences (p < 0.05) in the main pharmacokinetic parameters. The C max and AUC of emodin in constipation rats were about ten times that of normal rats, while the t 1/2 was remarkably decreased (p < 0.05). However, a significant decrease (p < 0.05) in AUC value for aloe-emodin and rhein was observed in model group compared with normal group. The results may be attributed to the direct action of aloe-emodin and rhein on intestinal cell membranes and the indirect action of emodin on bowel movement through the adjustment by nervous system.
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Acknowledgments
The study was supported by National Natural Science Foundation of China (No: 81373943); the National Basic Research Program of China (973 Program No: 2011BAI13B05, 2012CB723502), Sichuan Youth Science and Technology Fundation (2013JQ0018) and Sichuan Provincial Science and Technology Department of Youth Science and Technology Innovation Research Team Program-Sichuan Province Pharmacology of Traditional Chinese Medicine Science and Technology Innovation Youth Team(2014TD0007).
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Gong, Xh., Li, Y., Zhang, Rq. et al. The synergism mechanism of Rhubarb Anthraquinones on constipation elucidated by comparative pharmacokinetics of Rhubarb extract between normal and diseased rats. Eur J Drug Metab Pharmacokinet 40, 379–388 (2015). https://doi.org/10.1007/s13318-014-0216-7
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DOI: https://doi.org/10.1007/s13318-014-0216-7