Abstract
Background
Triple-negative breast cancers (TNBCs) are highly aggressive and metastatic. To date, finding efficacious targeted therapy molecules might be the only window of hope to cure cancer. Fibromodulin (FMOD), is ectopically highly expressed on the surface of Chronic Lymphocytic Leukemia (CLL) and bladder carcinoma cells; thus, it could be a promising molecule for targeted therapy of cancer. The objective of this study was to evaluate cell surface expression of FMOD in two TNBC cell lines and develop an antibody–drug conjugate (ADC) to target FMOD positive TNBC in vitro and in vivo.
Materials and methods
Two TNBC-derived cell lines 4T1 and MDA-MB-231 were used in this study. The specific binding of anti-FMOD monoclonal antibody (mAb) was evaluated by flow cytometry and its internalization was verified using phAb amine reactive dye. A microtubulin inhibitor Mertansine (DM1) was used for conjugation to anti-FMOD mAb. The binding efficacy of FMOD-ADC was assessed by immunocytochemistry technique. The anti-FMOD mAb and FMOD-ADC apoptosis induction were measured using Annexin V-FITC and flow cytometry. Tumor growth inhibition of anti-FMOD mAb and FMOD-ADC was evaluated using BALB/c mice injected with 4T1 cells.
Results
Our results indicate that both anti-FMOD mAb and FMOD-ADC recognize cell surface FMOD molecules. FMOD-ADC could induce apoptosis in 4T1 and MDA-MB-231 cells in vitro. In vivo tumor growth inhibition was observed using FMOD-ADC in 4T1 inoculated BALB/c mice.
Conclusion
Our results suggests high cell surface FMOD expression could be a novel bio-marker TNBCs. Furthermore, FMOD-ADC could be a promising candidate for targeting TNBCs.
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Acknowledgements
This work was supported by grants from Avicenna Research Institute, ACECR, Tehran, Iran (Grant No. 960205-012) and Tehran University of Medical Sciences, Tehran, Iran (Grant No. 97-03-87-40182).
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All procedures performed in studies involving animals were in accordance with the ethical standards of the ethics committee of Tehran University of Medical Sciences. (Approval number: IR.TUMS.VCR.REC.1397.1079).
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Haji Ghaffari, M., Simonian, M., Salimi, A. et al. A novel ADC targeting cell surface fibromodulin in a mouse model of triple-negative breast cancer. Breast Cancer 29, 1121–1132 (2022). https://doi.org/10.1007/s12282-022-01393-7
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DOI: https://doi.org/10.1007/s12282-022-01393-7