Tumor microenvironment-responsive MnSiO_(3)-Pt@BSA-Ce6 nanoplatform for synergistic catalysis-enhanced sonodynamic and chemodynamic cancer therapy

Compared with traditional photodynamic therapy(PDT),ultrasound(US)triggered sonodynamic therapy(SDT)has a wide application prospect in tumor therapy because of its deeper penetration depth.Herein,a novel MnSiO_(3)-Pt(MP)nanocomposite composed of Mn Si O_(3)nanosphere and noble metallic Pt was successfully constructed.After modification with bovine serum albumin(BSA)and chlorine e6(Ce6),the multifunctional nanoplatform Mn SiO_(3)-Pt@BSA-Ce6(MPBC)realized the magnetic resonance imaging(MRI)-guided synergetic SDT/chemodynamic therapy(CDT).In this nanoplatform,sonosensitizer Ce6 can generate singlet oxygen(^(1)O_(2))to kill cancer cells under US irradiation.Meanwhile,the loaded Pt has the ability to catalyze the decomposition of overexpressed hydrogen peroxide(H_(2)O_(2))in tumor microenvironment(TME)to produce oxygen(O_(2)),which can conquer tumor hypoxia and promote the SDT-induced^(1)O_(2)production.In addition,MP can degrade in mildly acidic and reductive TME,causing the release of Mn^(2+).The released Mn^(2+) not only can be used for MRI,but also can generate hydroxyl radical(^·OH)for CDT by Fenton-like reaction.The multifunctional nanoplatform MPBC has high biological safety and good anticancer effect,which displays the great latent capacity in biological application.