Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450000, People's Republic of China.
Department of Immuno-Oncology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050000, People's Republic of China.
J Nanobiotechnology. 2024 Jul 20;22(1):430. doi: 10.1186/s12951-024-02719-7.
Immunotherapy exhibits considerable promise for sustained tumor reduction. However, current cancer immunotherapy methods elicit limited responses due to the inadequate immunogenicity exhibited by cancer cells. This obstacle may be addressed using nanoplatforms that can activate synergistic therapies (photodynamic therapy and ferroptosis) in response to the acidic pH of the tumor microenvironment. We previously developed an amphiphilic photosensitizer, SR780, which displays satisfactory photodynamic effects. This photosensitizer is inactivated when bound to Fe (SR780Fe) but is activated upon release in mildly acidic conditions. In this study, M1 macrophage-derived extracellular vesicles (EVs) were fused with REV and SR780Fe-loaded liposomes (REV@SR780Fe@Lip) to form REV@SR780Fe@LEV hybrid nanovesicles. Further modification with the RS17 peptide for tumor targeting enabled a combination of photodynamic therapy, ferroptosis, and cGAS-STING pathway activation, resulting in enhanced antitumor efficacy through a synergistic effect. Upon laser irradiation, REV@SR780Fe@LEV-RS17 demonstrated antitumor effects in 4T1 breast cancer models, including the inhibition of lung and liver metastasis, as well as prevention of tumor recurrence.
免疫疗法在持续减少肿瘤方面显示出巨大的潜力。然而,由于癌细胞表现出的免疫原性不足,目前的癌症免疫疗法方法只能引起有限的反应。这个障碍可以通过纳米平台来解决,纳米平台可以对肿瘤微环境的酸性 pH 做出反应,激活协同疗法(光动力疗法和铁死亡)。我们之前开发了一种两亲性光敏剂 SR780,它具有令人满意的光动力效应。当与 Fe 结合时(SR780Fe),这种光敏剂失活,但在轻度酸性条件下释放时被激活。在这项研究中,M1 巨噬细胞衍生的细胞外囊泡(EVs)与 REV 和载有 SR780Fe 的脂质体(REV@SR780Fe@Lip)融合,形成 REV@SR780Fe@LEV 混合纳米囊泡。进一步用 RS17 肽进行肿瘤靶向修饰,使光动力疗法、铁死亡和 cGAS-STING 途径激活相结合,通过协同作用增强了抗肿瘤疗效。在激光照射下,REV@SR780Fe@LEV-RS17 在 4T1 乳腺癌模型中表现出抗肿瘤作用,包括抑制肺和肝转移以及预防肿瘤复发。
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