Article ; Online: Early nucleolar responses differentiate mechanisms of cell death induced by oxaliplatin and cisplatin.
The Journal of biological chemistry
2021 Volume 296, Page(s) 100633
Abstract: Recent reports provide evidence that the platinum chemotherapeutic oxaliplatin causes cell death via ribosome biogenesis stress, while cisplatin causes cell death via the DNA damage response (DDR). Underlying differences in mechanisms that might initiate ...
Abstract | Recent reports provide evidence that the platinum chemotherapeutic oxaliplatin causes cell death via ribosome biogenesis stress, while cisplatin causes cell death via the DNA damage response (DDR). Underlying differences in mechanisms that might initiate disparate routes to cell death by these two broadly used platinum compounds have not yet been carefully explored. Additionally, prior studies had demonstrated that cisplatin can also inhibit ribosome biogenesis. Therefore, we sought to directly compare the initial influences of oxaliplatin and cisplatin on nucleolar processes and on the DDR. Using pulse-chase experiments, we found that at equivalent doses, oxaliplatin but not cisplatin significantly inhibited ribosomal RNA (rRNA) synthesis by Pol I, but neither compound affected rRNA processing. Inhibition of rRNA synthesis occurred as early as 90 min after oxaliplatin treatment in A549 cells, concurrent with the initial redistribution of the nucleolar protein nucleophosmin (NPM1). We observed that the nucleolar protein fibrillarin began to redistribute by 6 h after oxaliplatin treatment and formed canonical nucleolar caps by 24 h. In cisplatin-treated cells, DNA damage, as measured by γH2AX immunofluorescence, was more extensive, whereas nucleolar organization was unaffected. Taken together, our results demonstrate that oxaliplatin causes early nucleolar disruption via inhibition of rRNA synthesis accompanied by NPM1 relocalization and subsequently causes extensive nucleolar reorganization, while cisplatin causes early DNA damage without significant nucleolar disruption. These data support a model in which, at clinically relevant doses, cisplatin kills cells via the canonical DDR, and oxaliplatin kills cells via ribosome biogenesis stress, specifically via rapid inhibition of rRNA synthesis. |
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MeSH term(s) | A549 Cells ; Adenocarcinoma of Lung/drug therapy ; Adenocarcinoma of Lung/metabolism ; Adenocarcinoma of Lung/pathology ; Antineoplastic Combined Chemotherapy Protocols/pharmacology ; Cell Death ; Cell Nucleolus/drug effects ; Cell Nucleolus/metabolism ; Cell Nucleolus/pathology ; Cisplatin/administration & dosage ; DNA Damage ; Humans ; Lung Neoplasms/drug therapy ; Lung Neoplasms/metabolism ; Lung Neoplasms/pathology ; Nuclear Proteins/genetics ; Nuclear Proteins/metabolism ; Oxaliplatin/administration & dosage ; Ribosomes/drug effects ; Ribosomes/metabolism |
Chemical Substances | Nuclear Proteins ; Oxaliplatin (04ZR38536J) ; nucleophosmin (117896-08-9) ; Cisplatin (Q20Q21Q62J) |
Language | English |
Publishing date | 2021-04-03 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. |
ZDB-ID | 2997-x |
ISSN | 1083-351X ; 0021-9258 |
ISSN (online) | 1083-351X |
ISSN | 0021-9258 |
DOI | 10.1016/j.jbc.2021.100633 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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