Background Due to the acquired drug resistance, the potency of cisplatin-based chemotherapy is limited in lung cancer, which is a big obstacle in clinical treatment of lung cancer. Abundant evidence has revealed that circular RNAs (circRNAs) exerted facilitating or suppressive function on the tumorigenesis of multiple cancers. The oncogenic role of circ-ABCB10 in breast cancer and clear cell renal cell carcinoma has been validated in recent researches. However, the regulatory mechanism of circ-ABCB10 and its relation to cellular sensitivity to cisplatin in lung cancer is poorly understood. Methods The expression and characteristic of circ-ABCB10 were analyzed by RT-qPCR and nucleic acid electrophoresis. CCK-8, colony formation, TUNEL and transwell assays were applied to probe the role of FOXD3-AS1 in lung cancer. The interactions of miR-556-3p with circ-ABCB10 and AK4 were testified by luciferase reporter and RIP assays. Results Circ-ABCB10 was markedly upregulated and featured with loop structure in lung cancer. Circ-ABCB10 depletion suppresses lung cancer progression and sensitizes lung cancer cells to cisplatin. Molecular mechanism assays manifested that circ-ABCB10 bound with miR-556-3p and negatively modulated miR-556-3p expression. Additionally, AK4 was testified to be the downstream target of miR-556-3p. More importantly, rescue assays clarified that upregulation of AK4 could reverse the cisplatin-sensitizing and tumor-suppressing effect of circ-ABCB10 knockdown on lung cancer cells. Conclusions Circ-ABCB10 knockdown enhances sensitivity of lung cancer cells to cisplatin by targeting miR-556-3p/AK4 axis.

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Background A newly infectious diseases named coronavirus disease 2019 (COVID-19) emerged in China and now has spread in many countries, and constituted a public health emergency of international concern. Extracorporeal membrane oxygenation (ECMO) is used as salvage therapies in critical COVID-19 patients with respiratory/cardiac failure. Case presentation A 49-year-old female patient was diagnosed with COVID-19 and progressed to critical cases, she was successfully treated with the application of awake extracorporeal membrane oxygenation. This case is the first reported successfully treatment of application awake ECMO in critical COVID-19 patient in China. Conclusions Here we present the first reported successfully treatment of application awake ECMO in critical COVID-19 patient, however, whether awake ECMO can be widely used in the treatment of critical COVID-19 patients need more practice.