Influence of Dehydroxymethylepoxyquinomicin on Radiosensitivity of Thyroid Carcinoma TPC-1 Cells

Jie Liu; Hu Cai; Heqing Yi; Xin Li; Yunsong Peng; Linfa Li

doi:10.1155/2022/5026308

Influence of Dehydroxymethylepoxyquinomicin on Radiosensitivity of Thyroid Carcinoma TPC-1 Cells

J Oncol. 2022 Sep 30:2022:5026308. doi: 10.1155/2022/5026308. eCollection 2022.

Authors

Jie Liu¹, Hu Cai², Heqing Yi¹, Xin Li¹, Yunsong Peng³, Linfa Li¹

Affiliations

¹ Department of Nuclear Medicine, Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institute of Basic Medicine and Cancer Chinese, Hangzhou, Zhejiang 310022, China.
² Department of Integrated Traditional Chinese and Western Medicine, Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institute of Basic Medicine and Cancer Chinese, Hangzhou, Zhejiang 310022, China.
³ Department of Pharmacy, Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Institute of Basic Medicine and Cancer Chinese, Hangzhou, Zhejiang 310022, China.

Abstract

Objective: To investigate the influence of dehydroxymethylepoxyquinomicin (DHMEQ), an NF-κB inhibitor, on radiosensitivity of thyroid carcinoma (TC) TPC-1 cells.

Methods: The isolation of CDl33 positive cells (CD133⁺ TPC-1) and negative cells (CD133^- TPC-1) from TPC-1 cells used immunomagnetic bead sorting. After verification of the toxicity of DHMEQ to cells by MTT and cell cloning assays, the cells were divided into four groups, of which three groups were intervened by DHMEQ, ¹³¹I radiation, and DHMEQ +¹³¹I radiation, respectively, while the fourth group was used as a control without treatment. Alterations in cell growth, apoptosis, and cell cycle were observed.

Results: DHMEQ had certain toxic effects on TPC-1 cells, with an IC50 of 38.57 μg/mL (P < 0.05). DHMEQ inhibited CD133⁺ and CD133- TPC-1 proliferation and their clonogenesis after irradiation. DHMEQ + radiation contributed to a growth inhibition rate and an apoptosis rate higher than either or them alone (P < 0.05), with a more significant effect on CD133^- TPC-1 than CD133+ TPC-1 under the same treatment conditions (P < 0.05).

Conclusion: DHEMQ can increase the radiosensitivity of TC cells to ¹³¹I, inhibit tumor cell growth, and promote apoptosis. However, its effect is less significant on CD133⁺ TPC-1 compared with CD133^- TPC-1, which may be related to the stem cell-like properties of CD133⁺ cells. In the future, the application of DHMEQ in TC 131I radiotherapy will effectively improve the clinical effect of patients.