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(H
DACI),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H
DACI的脂质体配方可能有效将H
DACI递送至肿瘤。为了有效地将H
DACI整合到脂质体膜中,我们合成了六种H
DACI-脂质偶联物,其中聚
乙二醇2000(P
EG2000)-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H
DACI(
SAHA或K-182)连接。使用
二硬脂酰磷脂酰
胆碱(D
SPC)和H
DACI-Chol偶联物或D
SPC、Chol和H
DACI-P
EG-脂质偶联物制备脂质体H
DACI-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-P
EG2000结合的脂质体油酰-P
EG2000-
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ca
SPase 3/7活性的诱导来体现。这些结果表明,脂质体H
DACI-脂质偶联物可能是癌症治疗的潜在工具。