title: Cationic core-shell nanoparticles with carmustine contained within O⁶-benzylguanine shell for glioma therapy.
abstract: The application of carmustine (BCNU) for glioma treatment is limited due to its poor selectivity for tumor and tumor resistance caused by O⁶-methylguanine-DNA-methyl transferase (MGMT). To improve the efficacy of BCNU, we constructed chitosan surface-modified poly (lactide-co-glycolides) nanoparticles (PLGA/CS NPs) for targeting glioma, loading BCNU along with O⁶-benzylguanine (BG), which could directly deplete MGMT. With core-shell structure, PLGA/CS NPs in the diameter around 177 nm showed positive zeta potential. In vitro plasma stability of BCNU in NPs was improved compared with free BCNU. The cellular uptake of NPs increased with surface modification of CS and decreasing particle size. The cytotoxicity of BCNU against glioblastoma cells was enhanced after being encapsulated into NPs; furthermore, with the co-encapsulation of BCNU and BG into NPs, BCNU + BG PLGA/CS NPs showed the strongest inhibiting ability. Compared to free drugs, PLGA/CS NPs could prolong circulation time and enhance accumulation in tumor and brain. Among all treatment groups, F98 glioma-bearing rats treated with BCNU + BG PLGA/CS NPs showed the longest survival time and the smallest tumor size. The studies suggested that the co-encapsulation of BCNU and BG into PLGA/CS NPs could remarkably enhance the efficacy of BCNU, accompanied with greater convenience for therapy.
authors: Key Laboratory of Smart Drug Delivery, Ministry of Education, Department of Pharmaceutics, School of Pharmacy, Fudan University, Lane 826, Zhang Heng Road, Shanghai 201203, PR China.
authors: Lili
authors: L
authors: Qian
authors: Jiajun
authors: J
authors: Zheng
authors: Ke
authors: K
authors: Wang
authors: Ying
authors: Y
authors: Tang
authors: Xiaofeng
authors: X
authors: Zhang
authors: Haishi
authors: H
authors: Zhang
authors: Fengping
authors: F
authors: Huang
authors: Yuanying
authors: Y
authors: Pei
authors: Yanyan
authors: Y
authors: Jiang
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000493:pharmacokinetics; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000737:chemistry / Q000493:pharmacokinetics; D002330:Carmustine / Q000737:chemistry / Q000493:pharmacokinetics*; D002412:Cations / Q000737:chemistry*; D045744:Cell Line, Tumor; D055598:Chemical Phenomena; D004195:Disease Models, Animal; D016503:Drug Delivery Systems; D005260:Female; D005909:Glioblastoma / Q000188:drug therapy*; D006147:Guanine / Q000031:analogs & derivatives / Q000737:chemistry / Q000493:pharmacokinetics; D008279:Magnetic Resonance Imaging; D008297:Male; D053758:Nanoparticles / Q000737:chemistry*; D051381:Rats; D011916:Rats, Inbred F344
chemical_list: D000970:Antineoplastic Agents; D002412:Cations; C064976:O(6)-benzylguanine; D006147:Guanine; D002330:Carmustine
keywords: Carmustine; Chitosan; Glioma; Nanoparticles; O(6)-benzylguanine; Poly (lactide-co-glycolides)