Abstract
We aimed to understand the crosstalk between mismatch repair (MMR) and FA-BRCA pathway in primary bladder carcinoma (BlCa) samples as well as in chemotolerant cell line. We analysed the genetic alterations of MLH1 and MSH2 (MMR-related genes) and after that we correlated it with the nuclear translocation of FANCD2 protein. Next, we evaluated this crosstalk in T24 BlCa cell line in response to doxorubicin treatment. In primary BlCa tumors, infrequent genetic deletion (17–20%) but frequent promoter methylation (28–55%) of MLH1 and MSH2 was observed, where MLH1 was significantly (p < 0.05) more methylated among the early staged samples (NMIBC). However, MSH2 was significantly more altered among the NMIBC samples, signifying the importance of MMR pathway during the early pathogenesis of the disease. Furthermore, BlCa samples with underexpressed MLH1/MSH2 protein possessed cytoplasmic FANCD2 protein; encouraging that inefficiency of MMR proteins might restrict FANCD2 nuclear translocation. Next, we analysed publicly available data in GEO2R tool where we observed that in response to chemotherapeutic drugs, expression of MLH1, MSH2 and FANCD2 were diminishing. Validating this result in doxorubicin tolerant T24 cells, we found that expression of MLH1 and MSH2 was gradually decreased with increasing dose of doxorubicin. Interestingly, FANCD2 mono-ubiquitination (L-form) was also reduced in chemotolerant T24 cells. The crosstalk between MMR and FA-BRCA pathway was substantiated in the primary BlCa tumors. Further, in response to doxorubicin, this crosstalk was found to be hampered due to under-expression of MLH1 and MSH2 gene, thereby rendering chemotolerance.
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02 May 2024
This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1007/s11010-024-05021-0
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Funding
This work was supported by University Grants Commission-National Eligibility Test Fellowship grant [Sr. No. 2061430780, Ref No.: 22/06/2014(i)EU-V to M.B.], Department of Biotechnology- West Bengal [923/(Sanc.)-BT (Estt.) RD 13/13F to C.K.P. and A.G.], Department of Science and Technology (Govt. of India), Kiran Division (SR/WOS-A/LS-278/2016 to D.M.) and NASI Senior Scientist Platinum Jubilee Fellowship (2020) to C.K.P.
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CKP, AG, DKP designed the study and brought funding from Department of Biotechnology, West Bengal. MB performed the experiments in the primary tumor samples and cell line. DKP provided the tumor samples and confirmed the histological stages of the tumor samples. MB and SG analyzed the results and did the statistical analysis. MB and CKP drafted the manuscript. DM and BC helped in the revision of the manuscript. The whole study was supervised by CKP and AG.
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11010_2022_4616_MOESM4_ESM.tif
Supplementary file4 (TIF 449 KB) Fig. S1 Kaplan-Meier survival curve in patients with a MLH1 deletion b MSH2 deletion c MLH1 methylation
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Basu, M., Mukhopadhyay, D., Chakraborty, B. et al. RETRACTED ARTICLE: Differential operation of MLH1/MSH2 and FANCD2 crosstalk in chemotolerant bladder carcinoma: a clinical and therapeutic intervening study. Mol Cell Biochem 478, 1599–1610 (2023). https://doi.org/10.1007/s11010-022-04616-9
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DOI: https://doi.org/10.1007/s11010-022-04616-9