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New Drug (CPU86017-RS) for Prevention and treatment of pulmonary hypertension

Pulmonary hypertension is the persistent hypertension of pulmonary artery above the normal maximum level. It is a multi-etiology disease with a complicated pathogenesis. Persistent pulmonary hypertension causes right ventricular hypertrophy, subsequently leading to right heart failure, which is one of the important causes of death. Current clinical drugs include oral endothelin receptor antagonists; inhaled NO; intravenous administration of prostacyclin derivatives, and nifedipine. But all these drugs can only be used as an adjuvant therapy for pulmonary hypertension.

CPU86017-RS, developed in this project, is an optical isomer of CPU86017. CPU86017 is a class of anti-arrhythmic drugs innovated independently by China Pharmaceutical University. All pre-clinical studies of CPU86017 have been completed. Studies have shown that CPU86017 had a significant therapeutic effect on treatment of pulmonary hypertension. However, the poor aqueous solubility, low bioavailability (about 10%), and its strong ¦Á-receptor antagonistic effects make it unsuitable for intravenous administration. To overcome the limitations of CPU86017, our group developed CPU86017-RS, an isomer of CPU86017. Experimental results showed that mechanism of action of CPU86017-RS in the treatment of pulmonary hypertension is clear, and that as compared with clinical drug nifedipine, CPU86017-RS not only has the vasodilating effect, but also has the effect on pulmonary artery reconstruction, which nifedipine does not have. As compared with the endothelin receptor antagonists, CPU86017-RS has calcium antagonistic effect, of which endothelin receptor antagonists is lack. Compared with racemic CPU86017, CPU86017-RS has the following advantages: the efficacy of the treatment of hypoxic pulmonary hypertension is more obvious; enhancement of calcium antagonistic effect; weakened ¦Á-blocking effect; significantly improved pharmacokinetics and bioavailability (20 %); increased solubility; and decreased toxicity. The metabolic pathways and its metabolites have been well-documented for racemate CPU86017. It should be reasonable to suppose that the isomer CPU86017-RS has the same metabolic pathways as  racemate CPU86017.   

This project uses the raw materials for the herbal active ingredient berberine (berberine), wide variety of sources, low prices. By reducing, chiral separation, quaternary ammonium and column chromatography to obtain, the method is simple. And related research racemic CPU86017 provides the basis for the study of the project, such as CPU86017 metabolic pathways and metabolites has been clear for its isomer CPU86017-RS is not going to change, should be the same as the racemate.

Advantages of RS-isomers: Readily available raw materials, matured process; excellent foundation for pharmacodynamic and pharmacokinetic research; toxicology research foundation, lower toxicity than racemate, low risk; support from the preliminary studies on racemate CPU86017. Currently, the synthesis process of CPU86017-RS isomer has been started, the preliminary studies on the major pharmacodynamics, toxicology of treatment of pulmonary hypertension have been under investigation, the pharmacokinetics and bioavailability are being studied by intravenous or intraperitoneal injections of three dosages of CPU86017-RS.

China patent obtained: 02138325.1 CN
2Â¥2014-10-09 22:32:37
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