Antitumor Effect of Liposomal Histone Deacetylase Inhibitor-Lipid Conjugates in Vitro
作者:Yoshiyuki Hattori、Yasuo Nagaoka、Manami Kubo、Haruka Yamasaku、Yuta Ishii、Hiroko Okita、Hiroki Nakano、Shinichi Uesato、Yoshie Maitani
DOI:10.1248/cpb.59.1386
日期:——
Histone deacetylase inhibitor (HDACI), suberoylanilide hydroxamic acid (SAHA), approved by the Food and Drug Administration (FDA) for the treatment of cutaneous T cell lymphoma, is a promising new treatment strategy for various cancers. In this study, we hypothesized that a liposomal formulation of HDACI might efficiently deliver HDACI into tumors. To incorporate HDACI efficiently into the liposomal membrane, we synthesized six HDACI-lipid conjugates, in which polyethylene glycol2000 (PEG2000)-lipid or cholesterol (Chol) was linked with a potent hydroxamic acid, HDACI, SAHA or K-182, by cleavable linkers, such as ester, carbamide and disulfide bonds. Liposomal HDACI-lipid conjugates were prepared with distearoylphosphatidylcholine (DSPC) and HDACI-Chol conjugate or with DSPC, Chol and HDACI-PEG-lipid conjugates, and their cytotoxicities were evaluated for human cervix tumor HeLa and mouse colon tumor Colon 26 cells. Among the liposomes, liposomal oleyl-PEG2000-SAHA conjugated with SAHA and oleyl-PEG2000 via a carbamate linker showed higher cytotoxicity via hyperacetylation of histone H3 and induction of caspase 3/7 activity. These results suggested that liposomal HDACI-lipid conjugates may be a potential tool for cancer therapy.
组蛋白去乙酰化酶抑制剂(HDACI),例如已获食品和药物管理局(FDA)批准用于治疗皮肤T细胞淋巴瘤的辛二酰苯胺异羟肟酸(SAHA),是一种有前景的多种癌症治疗新策略。在本研究中,我们假设HDACI的脂质体配方可能有效将HDACI递送至肿瘤。为了有效地将HDACI整合到脂质体膜中,我们合成了六种HDACI-脂质偶联物,其中聚乙二醇2000(PEG2000)-脂质或胆固醇(Chol)通过可裂解的连接子,例如酯、碳酰胺和二硫键,与强效异羟肟酸HDACI(SAHA或K-182)连接。使用二硬脂酰磷脂酰胆碱(DSPC)和HDACI-Chol偶联物或DSPC、Chol和HDACI-PEG-脂质偶联物制备脂质体HDACI-脂质偶联物,并评估它们对人宫颈肿瘤HeLa和小鼠结肠肿瘤Colon 26细胞的细胞毒性。在所有脂质体中,通过碳酰胺连接子与SAHA和油酰-PEG2000结合的脂质体油酰-PEG2000-SAHA显示出更高的细胞毒性,这通过组蛋白H3的高度乙酰化和caspase 3/7活性的诱导来体现。这些结果表明,脂质体HDACI-脂质偶联物可能是癌症治疗的潜在工具。