AUTHOR=Li Yang , Liu Zeming , Zeng Weng , Wang Ziqi , Liu Chunping , Zeng Ning , Zhong Keli , Jiang Dazhen , Wu Yiping 

TITLE=A Novel H2O2 Generator for Tumor Chemotherapy-Enhanced CO Gas Therapy

JOURNAL=Frontiers in Oncology

VOLUME=11

YEAR=2021

URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.738567

DOI=10.3389/fonc.2021.738567

ISSN=2234-943X

ABSTRACT=<p>Carbon monoxide (CO) gas therapy is a promising cancer treatment. However, gas delivery to the tumor site remains problematic. Proper tunable control of CO release in tumors is crucial to increasing the efficiency of CO treatment and reducing the risk of CO poisoning. To overcome such challenges, we designed ZCM, a novel stable nanotechnology delivery system comprising manganese carbonyl (MnCO) combined with anticancer drug camptothecin (CPT) loaded onto a zeolitic imidazole framework-8 (ZIF-8). After intravenous injection, ZCM gradually accumulates in cancerous tissues, decomposing in the acidic tumor microenvironment, releasing CPT and MnCO. CPT acts as a chemotherapy agent destroying tumors and producing copious H<sub>2</sub>O<sub>2</sub>. MnCO can react with the H<sub>2</sub>O<sub>2</sub> to generate CO, powerfully damaging the tumor. Both <italic>in vitro</italic> and <italic>in vivo</italic> experiments indicate that the ZCM system is both safe and has excellent tumor inhibition properties. ZCM is a novel system for CO controlled release, with significant potential to improve future cancer therapy.</p>