The Imidazacridine Derivative LPSF/AC-05 Induces Apoptosis, Cell Cycle Arrest, and Topoisomerase II Inhibition in Breast Cancer, Leukemia, and Lymphoma.

Introduction: Cancer is the major cause of morbidity and mortality worldwide. Current treatments for both solid and hematological tumors are associated with severe adverse effects and drug resistance, necessitating the development of novel selective antineoplastic drugs.

Methods: The present study describes the antitumor activity of the imidazacridine derivative 5-acridin-9-ylmethylidene-2-thioxoimidazolidin-4-one (LPSF/AC05) in breast cancer, leuke-mia, and lymphoma cells. Cytotoxicity assays were performed in PBMC and in breast cancer, leukemia, and lymphoma cell lines using the MTT method. Changes in cell cycle progression and apoptosis were assessed using flow cytometry. Moreover, topoisomerase II inhibition as-says were performed. LPSF/AC05 exhibited cytotoxicity in six of the nine cell lines tested.

Results: The best results for leukemia and lymphoma were observed in the Toledo, Jurkat, and Raji cell lines (IC50 = 27.18, 31.04, and 33.36 M, respectively). For breast cancer, the best re-sults were observed in the triple-negative cell line MDA-MB-231 (IC50 = 27.54 μM). The compound showed excellent selectivity, with no toxicity to normal human cells (IC50 > 100M; selectivity index > 3). Cell death was primarily induced by apoptosis in all cell lines. Furthermore, LPSF/AC05 treatmentinduced cell cycle arrest at the G0/G1 phase in leuke-mia/lymphoma and at the G2/M phase in breast cancer.

Conclusion: Finally, topoisomerase II was inhibited. These results indicate the potential ap-plication of LPSF/AC05 in cancer therapy.