1.Sustained Increase in the Oral Bioavailability of Loperamide after a Single Oral Dose of HM30181, a P-glycoprotein Inhibitor, in Healthy Male Participants.
Cha YJ1, Lee H2, Gu N1, Kim TE1, Lim KS1, Yoon SH1, Chung JY1, Jang IJ1, Shin SG1, Yu KS1, Cho JY1. Basic Clin Pharmacol Toxicol. 2013 Dec;113(6):419-24. doi: 10.1111/bcpt.12108. Epub 2013 Aug 7.
HM30181 is a new P-glycoprotein (P-gp) inhibitor. This study was conducted to investigate the effect of HM30181 and its duration of action on P-gp inhibition using loperamide as a probe drug. An open-label, five-period, fixed-sequence, cross-over study was conducted in 25 healthy Korean participants, who received a single oral dose of loperamide at 16 mg in five periods lasting for 17 days. In period II, participants also randomly received a single oral dose of HM30181 at 1, 5, 10, 15 mg simultaneously with loperamide. Serial pharmacokinetic blood samples were obtained up to 72 and 336 hr after loperamide and HM30181 administration, respectively. A mixed-effects analysis was performed to compare the area under the plasma concentration versus time curve from time 0 to 72 hr (AUC0-72 hr ) between periods and HM30181 dose groups. Tolerability was also assessed. The AUC0-72 hr of repeatedly administered loperamide was significantly increased 1.
2.Interaction of HM30181 with P-glycoprotein at the murine blood-brain barrier assessed with positron emission tomography.
Bauer F1, Wanek T, Mairinger S, Stanek J, Sauberer M, Kuntner C, Parveen Z, Chiba P, Müller M, Langer O, Erker T. Eur J Pharmacol. 2012 Dec 5;696(1-3):18-27. doi: 10.1016/j.ejphar.2012.09.013. Epub 2012 Sep 26.
HM30181, a potent and selective inhibitor of the adenosine triphosphate-binding cassette transporter P-glycoprotein (Pgp), was shown to enhance oral bioavailability and improve antitumour efficacy of paclitaxel in mouse tumour models. In search for a positron emission tomography (PET) radiotracer to visualise Pgp expression levels at the blood-brain barrier (BBB), we examined the ability of HM30181 to inhibit Pgp at the murine BBB. HM30181 was shown to be approximately equipotent with the reference Pgp inhibitor tariquidar in inhibiting rhodamine 123 efflux from CCRF-CEM T cells (IC(50), tariquidar: 8.2 ± 2.0 nM, HM30181: 13.1 ± 2.3 nM). PET scans with the Pgp substrate (R)-[(11)C]verapamil in FVB wild-type mice pretreated i.v. with HM30181 (10 or 21 mg/kg) failed to show significant increases in (R)-[(11)C]verapamil brain uptake compared with vehicle treated animals. PET scans with [(11)C]HM30181 showed low and not significantly different brain uptake of [(11)C]HM30181 in wild-type, Mdr1a/b((-/-)) and Bcrp1((-/-)) mice and significantly, i.
3.Single-cell pharmacokinetic imaging reveals a therapeutic strategy to overcome drug resistance to the microtubule inhibitor eribulin.
Laughney AM1, Kim E1, Sprachman MM1, Miller MA1, Kohler RH1, Yang KS1, Orth JD2, Mitchison TJ2, Weissleder R3. Sci Transl Med. 2014 Nov 5;6(261):261ra152. doi: 10.1126/scitranslmed.3009318.
Eribulin mesylate was developed as a potent microtubule-targeting cytotoxic agent to treat taxane-resistant cancers, but recent clinical trials have shown that it eventually fails in many patient subpopulations for unclear reasons. To investigate its resistance mechanisms, we developed a fluorescent analog of eribulin with pharmacokinetic (PK) properties and cytotoxic activity across a human cell line panel that are sufficiently similar to the parent drug to study its cellular PK and tissue distribution. Using intravital imaging and automated tracking of cellular dynamics, we found that resistance to eribulin and the fluorescent analog depended directly on the multidrug resistance protein 1 (MDR1). Intravital imaging allowed for real-time analysis of in vivo PK in tumors that were engineered to be spatially heterogeneous for taxane resistance, whereby an MDR1-mApple fusion protein distinguished resistant cells fluorescently. In vivo, MDR1-mediated drug efflux and the three-dimensional tumor vascular architecture were discovered to be critical determinants of drug accumulation in tumor cells.
4.HM30181 Derivatives as Novel Potent and Selective Inhibitors of the Breast Cancer Resistance Protein (BCRP/ABCG2).
Köhler SC1, Wiese M1. J Med Chem. 2015 May 14;58(9):3910-21. doi: 10.1021/acs.jmedchem.5b00188. Epub 2015 Apr 24.
The breast cancer resistance protein (BCRP, ABCG2) belongs to the superfamily of ATP binding-cassette (ABC) proteins. In addition to other physiological functions, it transports potentially cell-damaging compounds out of the cell using the energy from ATP hydrolysis. Certain tumors overexpressing BCRP were found to become resistant against various anticancer drugs. In previous work, we found that tariquidar analogues lacking the tetrahydroisoquinoline moiety selectively inhibit BCRP. In the present study, we synthesized 21 derivatives of the third-generation P-gp inhibitor HM30181, which is structurally related to tariquidar. The compounds were tested for their inhibitory activities against BCRP and screened against P-glycoprotein (P-gp, ABCB1) and multidrug resistance protein 1 (MRP1, ABCC1) to confirm the selectivity toward BCRP. The most potent compounds are selective toward BCRP and 2-fold more potent than the reference Ko143. Qualitative structure-activity relationship (SAR) analysis revealed that the presence of a methoxy group in the ortho or para position of at least one phenyl ring is beneficial for inhibitory activity.