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Extremely effective chemo-radiotherapy by inducing immunogenic cell death and radio-triggered drug release under hypoxia alleviation.

著者 Zhu C , Guo X , Luo L , Wu Z , Luo Z , Jiang M , Zhang J , Qin B , Shi Y , Lou Y , Qiu YQ , You J
ACS Appl Mater Interfaces.2019 Nov 21 ; ():.
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Local hypoxia in solid malignancies often results in resistance to radiotherapy (RT) and chemotherapy (CT), which may be one of main reasons for their failure in clinical application. Especially oxygen is an essential element for enhancing DNA damage caused by ionizing radiation in radiotherapy. Here, two biomimetic oxygen delivery systems were designed by encapsulating hemoglobin (Hb) alone into a liposome (Hb-Lipo) or co-encapsulating Hb and doxorubicin (DOX) into a liposome (DOX-Hb-Lipo). Our data indicated that both Hb-Lipo and DOX-Hb-Lipo could effectively alleviate the hypoxia in tumors. We demonstrated that RT plus tumor-targeting delivery of oxygen mediated by Hb-Lipo could significantly overcome the tolerance of hypoxic cancer cells to RT, showing significantly enhanced cancer cells killing and tumor growth inhibition ability, mainly attributing to hypoxia alleviation and increased ROS production under RT in cancer cells. Furthermore, a melanoma model that was quite insensitive to both RT and CT was used to test the efficacy of chemo-radiotherapy combined with hypoxia alleviation. RT plus Hb-Lipo only caused a limited increase in antitumor activity. However, extremely strong tumor inhibition could be obtained by RT combined with DOX-Hb-Lipo-mediated CT, attributing to radio-triggered DOX release and an enhanced immunogenic cell death induced by RT under oxygen supplement. Our study provided a valuable reference for overcoming hypoxia-induced radioresistance and a useful therapeutic strategy for cancers that are extremely insensitive to chemo- or radiotherapy.
PMID: 31751119 [PubMed - as supplied by publisher]
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