Bone-Targeted Calcium Phosphate-Polymer Hybrid Nanoparticle Co-Deliver Zoledronate and Docetaxel to Treat Bone Metastasis of Prostate Cancer.

Prostate cancer is the most common malignant tumor with bone metastasis, and there is still no ideal treatment for bone metastasis of prostate cancer. In this study, a pH and GSH dual sensitive calcium phosphate-polymer hybrid nanoparticle (DTX@Cap/HP) was prepared to co-deliver zoledronate (ZOL) and docetaxel (DTX) to treat bone metastasis of prostate cancer. DTX@Cap/HP exhibited high bone binding affinity and released more DTX and ZOL in acidic and high GSH concentration environment. A large amount of DTX@Cap/HP was uptaken by PC-3 cell in acidic medium than that in neutral medium. DTX@Cap/HP obviously reduced PC-3 cell proliferation and bone lesion in in-vitro 3D model of bone metastases of prostate cancer. Besides, DTX@Cap/HP also exhibited stronger anti bone metastases of prostate cancer activity in vivo as compared with the same dose of DTX + ZOL, which resulted from the co-delivery of DTX and ZOL to bone metastases of prostate cancer by DTX@Cap/HP and the synergistic effects of DTX and ZOL. DTX@Cap/HP has great potential in the treatment of bone metastases of prostate cancer.

Bone-targeted PAMAM nanoparticle to treat bone metastases of lung cancer.

Aim: To prepare pH-sensitive nanoparticle composed of alendronate (ALN) and poly(amidoamine) (PAMAM) to treat bone metastases of lung cancer. Methods: The solvent evaporation method was used to prepare docetaxel (DTX)-loaded ALN-PAMAM nanoparticles (DTX@ALN-PAMAM). Results: The in vitro results showed DTX@ALN-PAMAM significantly enhanced the anticancer activity of DTX and inhibited the formation of osteoclasts. DTX@ALN-PAMAM concentrated at bone metastasis site in mice, which resulted in the suppression of bone resorption, pain response and growth of bone metastases. Eventually, the therapeutic effect of DTX on bone metastases of lung cancer was obviously improved. Conclusion: ALN modified PAMAM nanoparticle could be an effective platform for the treatment of bone metastases of lung cancer.