HPMA copolymer conjugate with pirarubicin: In vitro and ex vivo stability and drug release study

0482175 - ÚMCH 2019 RIV GB eng J - Článek v odborném periodiku
Islam, W. - Fang, J. - Etrych, Tomáš - Chytil, Petr - Ulbrich, Karel - Sakoguchi, A. - Kusakabe, K. - Maeda, H.
HPMA copolymer conjugate with pirarubicin: In vitro and ex vivo stability and drug release study.
International Journal of Pharmaceutics. Roč. 536, č. 1 (2018), s. 108-115. ISSN 0378-5173. E-ISSN 1873-3476
Grant CEP: GA ČR(CZ) GA15-02986S; GA MŠMT(CZ) LQ1604; GA MŠMT(CZ) ED1.1.00/02.0109
Grant ostatní: AV ČR(CZ) JSPS-16-05
Program: Bilaterální spolupráce
Institucionální podpora: RVO:61389013
Klíčová slova: EPR effect * HPMA copolymer * tumor-targeting
Obor OECD: Pharmacology and pharmacy
Impakt faktor: 4.213, rok: 2018

We have developed a tumor environment-responsive polymeric anticancer prodrug containing pirarubicin (THP) conjugated to N-(2-hydroxypropyl) methacrylamide copolymer (PHPMA), [P-THP], through a spacer containing pH-sensitive hydrazone bond, that showed remarkable therapeutic effect against various tumor models and in a human pilot study. Toward clinical development, here we report THP release profile from its HPMA copolymer conjugate, the conjugate stability, protein and cell-binding and solubility of P-THP. Size exclusion chromatography of P-THP (molecular weight 38 kDa) showed similar hydrodynamic volume as bovine serum albumin (BSA) in aqueous solution, with no apparent interactions with BSA, nor aggregation by itself. pH-responsive release of free THP was reconfirmed at pHs 6.5 and lower. The drug release was significantly affected by a type of used buffer. Phosphate buffer seems to facilitate faster hydrazone bond cleavage at pH 7.4 whereas higher stability was achieved in L-arginine solution which yielded only little cleavage and THP release, approx. 15% within 2 weeks at the same pH at 25 °C. Furthermore, ex vivo study using sera of different animal species showed very high stability of P-THP. Incubation with blood showed high stability of P-THP during circulation, without binding to blood cells. These findings revealed that L-arginine solution provides appropriate media for formulation of P-THP infusion solution as tumor-targeted polymeric anticancer drug based on EPR effect.
Trvalý link: http://hdl.handle.net/11104/0278286