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      Tissue Distribution of Berberine and Its Metabolites after Oral Administration in Rats

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          Abstract

          Berberine (BBR) has been confirmed to have multiple bioactivities in clinic, such as cholesterol-lowering, anti-diabetes, cardiovascular protection and anti- inflammation. However, BBR’s plasma level is very low; it cannot explain its pharmacological effects in patients. We consider that the in vivo distribution of BBR as well as of its bioactive metabolites might provide part of the explanation for this question. In this study, liquid chromatography coupled to ion trap time-of-flight mass spectrometry (LC/MS n-IT-TOF) as well as liquid chromatography that coupled with tandem mass spectrometry (LC-MS/MS) was used for the study of tissue distribution and pharmacokinetics of BBR in rats after oral administration (200 mg/kg). The results indicated that BBR was quickly distributed in the liver, kidneys, muscle, lungs, brain, heart, pancreas and fat in a descending order of its amount. The pharmacokinetic profile indicated that BBR’s level in most of studied tissues was higher (or much higher) than that in plasma 4 h after administration. BBR remained relatively stable in the tissues like liver, heart, brain, muscle, pancreas etc. Organ distribution of BBR’s metabolites was also investigated paralleled with that of BBR. Thalifendine (M1), berberrubine (M2) and jatrorrhizine (M4), which the metabolites with moderate bioactivity, were easily detected in organs like the liver and kidney. For instance, M1, M2 and M4 were the major metabolites in the liver, among which the percentage of M2 was up to 65.1%; the level of AUC (0-t) (area under the concentration-time curve) for BBR or the metabolites in the liver was 10-fold or 30-fold higher than that in plasma, respectively. In summary, the organ concentration of BBR (as well as its bioactive metabolites) was higher than its concentration in the blood after oral administration. It might explain BBR’s pharmacological effects on human diseases in clinic.

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          Extensive intestinal first-pass elimination and predominant hepatic distribution of berberine explain its low plasma levels in rats.

          Berberine, one of the most commonly used natural products, exhibits a poor plasma concentration-effect relationship whose underlying mechanisms remain largely unclear. This study was designed to test the hypothesis that extensive first-pass elimination and abundant tissue distribution of berberine may be its specific pharmacokinetic properties. For that, four different dosing routes, intragastric, intraduodenal, intraportal, and intravenous, were used to investigate the gastric, intestinal, and hepatic first-pass elimination of berberine. After intragastric dosing, approximately half of berberine ran intact through the gastrointestinal tract and another half was disposed of by the small intestine, leading to an extremely low extent of absolute oral bioavailability in rats (0.36%). Moreover, the major berberine metabolites were identified and quantified in rat enterocyte S9 fractions, portal vein plasma, and intestinal perfusates; plasma concentrations and tissue distribution of berberine and its major metabolites were determined as well. Data indicated that M1, M2 glucuronide, and M3 were the major metabolites generated from the small intestine and that there was a 70-fold increase in the ratio of the area under the concentration-time curve value for berberine (liver versus plasma). We conclude that intestinal first-pass elimination of berberine is the major barrier of its oral bioavailability and that its high extraction and distribution in the liver could be other important factors that lead to its low plasma levels in rats.
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            Bioavailability study of berberine and the enhancing effects of TPGS on intestinal absorption in rats.

            Berberine chloride (BBR) is a natural isoquinoline alkaloid extracted from medicinal herbs. It has been reported that the intestinal absorption of BBR is very low. In this study, the absolute bioavailability of BBR was studied, and the enhancing effects of D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) on intestinal absorption were investigated in rats. BBR injection was administrated via the femoral vein at a dose of 1.0 mg kg(-1) in intravenous group, and BBR oral formulations were administrated by oral gavage at a dose of 100 mg kg(-1) in BBR control (control) group and BBR-TPGS (test) group, respectively. The result showed that BBR had a very low absolute bioavailability of 0.68%, and TPGS could enhance intestinal absorption of BBR significantly. TPGS at a concentration of 2.5% could improve peak concentration (C(max)) and area under the curve (AUC(0-36)) of BBR by 2.9 and 1.9 times, respectively. The absorption enhancing ability of TPGS may be due to its ability to affect the biological activity of P-glycoprotein and thereby reduce the excretion of absorbed BBR into the intestinal lumen. This study indicated that absolute bioavailability of BBR was 0.68% in rats, and TPGS was a good absorption enhancer capable of enhancing intestinal absorption of BBR significantly.
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              Acute toxicity of berberine and its correlation with the blood concentration in mice.

              The aim of this study was to investigate the LD(50) (median lethal dosage) of berberine (BBR) through three different routes of injection in mice: intravenous (i.v.) injection, intraperitoneal (i.p.) injection, and intragastric (i.g.) oral administration. The concentration of BBR in blood from their i.g. doses (10.4, 20.8, 41.6, and 83.2 g/kg) and the content relationship of BBR among different injections were analyzed by high-performance liquid chromatography (HPLC). The LD(50) of BBR from i.v. and i.p. injections is 9.0386 and 57.6103 mg/kg, respectively; but no LD(50) was found in the i.g. group. A significant difference in bioavailability was observed between the different routes. Furthermore, the concentration of BBR in the blood from different i.g. doses was also significantly different. However, we discovered an interesting phenomenon indicating that the absorption of BBR by oral administration has a limit, therefore, explaining the difficulty in obtaining an LD(50) of BBR for i.g. injection. From the analysis of BBR content in blood after various administrations, we hypothesized that not only does the concentration of BBR in blood contribute to its acute toxicity, but also the routes of administration may be an important facet that affects this toxicity evaluation. 2010 Elsevier Ltd. All rights reserved.
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                Author and article information

                Contributors
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, USA )
                1932-6203
                2013
                31 October 2013
                : 8
                : 10
                : e77969
                Affiliations
                [1]State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
                Biological Research Centre of the Hungarian Academy of Sciences, Hungary
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Conceived and designed the experiments: XST JYM RF CM WJC YPS JF MH CYH WYH YW JDJ. Performed the experiments: XST JYM RF WJC YPS JWS. Analyzed the data: XST JYM RF YW. Contributed reagents/materials/analysis tools: XST JYM RF WJC YPS. Wrote the paper: XST JYM YW JDJ.

                Article
                PONE-D-13-15989
                10.1371/journal.pone.0077969
                3815028
                24205048
                9db3f966-8e8b-49d0-89a8-4691e862d990
                Copyright @ 2013

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 16 April 2013
                : 9 September 2013
                Page count
                Pages: 9
                Funding
                The project was supported by National Science and Technology Special Projects (2012ZX09301-002-001, 2012ZX09301-002006), and the financial support from the National Natural Science Foundation of China (No. 30873115and 81072611). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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