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Modulation of transporter activity of OATP1B1 and OATP1B3 by the major active components of Radix Ophiopogonis.

Radix Ophiopogonis is often an integral part of many traditional Chinese formulas, such as Shenmai injection used to treat cardio-cerebrovascular diseases. The present study aimed to investigate the influence of the four active components of Radix Ophiopogonis on the transport activity of OATP1B1 and OATP1B3. The uptake of rosuvastatin in OATP1B1-HEK293T cells were stimulated by methylophiopogonanone A (MA) and ophiopogonin D' (OPD') with EC50 calculated to be 11.33±2.78 and 4.62±0.64 μM, respectively. However, there were no remarkable influences on rosuvastatin uptake in the presence of methylophiopogonanone B (MB) or ophiopogonin D (OPD). The uptake of atorvastatin in OATP1B1-HEK293T cells can be increased by MA, MB, OPD and OPD' with EC50 calculated to be 6.00±1.60, 13.64±4.07, 10.41±1.28 and 3.68±0.85 μM, respectively. The uptake of rosuvastatin in OATP1B3-HEK293T cells was scarcely influenced by MA, MB, and OPD, but was considerably increased by OPD' with an EC50 of 14.95±1.62 μM. However, the uptake of telmisartan in OATP1B3-HEK293T cells was notably reduced by OPD' with an IC50 of 4.44±1.10 μM, and barely affected by MA, MB, and OPD. The four active components of Radix Ophiopogonis affect the transporting activitives of OATP1B1 and OATP1B3 in a substrate-dependent manner.

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