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Thermodynamic stability of cisplatin-loaded polymeric micelles and the phenotypic switching of the tumor-associated macrophages induced by combination of cisplatin-loaded micelles and Anti-PD-L1 antibody.

  • Haoyang Yuan‎ et al.
  • International journal of pharmaceutics‎
  • 2022‎

Chemotherapy is an effective anti-tumor treatment. Some anticancer chemotherapeutic drugs can not only induce cell death, but can also elicit antitumor immune responses. Here, the stability of cisplatin-loaded polymeric micelles (CDDP-PMs), pharmacokinetic drug-drug interactions of CDDP and anti-PD-L1 antibody (aPD-L1) in vivo and the alteration of the tumor microenvironment by combination of CDDP-PMs and aPD-L1 were evaluated. CDDP-PMs were fabricated by coordinated complexation and self-assembly method for tumor targeting. CDDP-PMs with higher mass ratio of copolymer have higher thermodynamic stability. The pharmacokinetic study showed that the CDDP and aPD-L1 were metabolized and cleared by two different pathways, suggesting that there is almost no risk of potential drug interactions between CDDP and aPD-L1 and the combination of aPD-L1 and CDDP- PMs may not alter the tissue distribution of CDDP. In vivo antitumor test showed that the tumor growth inhibition rates of CDDP-PMs combined with medium-dose aPD-L1 and CDDP-PMs combined with high-dose PD-L1 were 89.41% and 93.16%, respectively and therapeutic efficacy can be further increased by increasing the dose of aPD-L1 in co-administration group. This therapeutic system by combining chemotherapy and immunotherapy further increases the link between them and holds great potential to offer better safety and antitumor efficacy profiles.


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