Arsenic trioxide-induced cytotoxicity in A549 cells: The role of necroptosis

Abstract

Introduction Lung cancer is one of the deadliest cancers globally. Arsenic trioxide (ATO) is still present as a highly effective drug in treating acute promyelocytic leukemia (APL). Chemotherapy resistance is one of the major problems in cancer therapy. Necroptosis, can overcomes resistance to apoptosis, and can promote cancer treatment. This study examines the necroptosis pathway in A549 cancer cells exposed to ATO.

Methods We used the MTT test to determine the ATO effects on the viability of A549 cells at three different time intervals. Also, the reactive oxygen species (ROS) and mitochondrial membrane potential (MMP) were performed in three-time intervals. The effect of ATO on apoptosis was evaluated by Annexin V / PI staining and, the RIPK1 and MLKL gene expression were measured by Real-Time PCR.

Results The ATO has dose and time-dependent cytotoxic effects, so at 24, 48, and 72 h, the IC50 doses were 33.81 ‘11.44 ‘2.535 µM respectively. A 50 μM ATO is the most appropriate to increase the MMP loss significantly at all three times. At 24 and 48 h after exposure of cells to ATO, the ROS levels increased. The RIPK1 gene expression increased significantly compared to the control group at concentrations of 50 and 100 μM; however, MLKL gene expression decreased.

Conclusions The A549 cells, after 48 h exposure to ATO at 50 and 100 μM, induces apoptosis and necroptosis. Due to the reduced expression of MLKL, it can be concluded that ATO is probably effective in the metastatic stage of cancer cells.

Key words

arsenic trioxide - apoptosis - Necroptosis - A549 cell line - MLKL - RIPK1

^* both authors contributed equally to this work: Maryam Jamil, Afshin Mohammadi-Bardbori

Publication History

Received: 14 February 2023

Accepted: 11 April 2023

Article published online:
25 May 2023

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