Article ; Online: Microcystin-LR-induced epithelial-mesenchymal transition-like cells acquire resistance to multi-toxins.
Toxicon : official journal of the International Society on Toxinology
2023 Volume 238, Page(s) 107592
Abstract: The protein phosphatase inhibitor microcystin-LR (MC-LR), a hepatocyte-selective cyanotoxin, induces phenotypic changes in HEK293 OATP1B3-expressing (HEK293-OATP1B3) cells, which include cytoskeletal reorganization (HEK293-OATP1B3-AD) and anoikis ... ...
Abstract | The protein phosphatase inhibitor microcystin-LR (MC-LR), a hepatocyte-selective cyanotoxin, induces phenotypic changes in HEK293 OATP1B3-expressing (HEK293-OATP1B3) cells, which include cytoskeletal reorganization (HEK293-OATP1B3-AD) and anoikis resistance (HEK293-OATP1B3-FL) transformed cells, respectively. These cells acquire resistance to MC-LR and partial epithelial-mesenchymal transition (EMT) characteristics. In cancer cells, EMT is generally involved in multi-drug resistance. Here, we focused on the multi-drug resistance of HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells. The MTT assay and immunoblotting were conducted to examine the responses of HEK293-OATP1B3, HEK293-OATP1B3-AD, and HEK293-OATP1B3-FL cells to multiple toxins and drugs that function as substrates for OATP1B3, including MC-LR, nodularin (Nod), okadaic acid (OA), and cisplatin (CDDP). HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells were more resistant to MC-LR, Nod, and OA than HEK293-OATP1B3 cells. Conversely, the three cell types were equivalently sensitive to CDDP. By using protein phosphatase assay, the reduction of the inhibitory effect of MC-LR and Nod on phosphatase activity might be one reason for the resistance to MC-LR and Nod in HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells. Furthermore, the parental HEK293-OATP1B3 cells showed enhanced p53 phosphorylation and stabilization after MC-LR exposure, while p53 phosphorylation was attenuated in HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells. Moreover, in HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells, AKT phosphorylation was higher than that of the parental HEK293-OATP1B3 cell line. These results suggest that the multi-toxin resistance observed in HEK293-OATP1B3-AD and HEK293-OATP1B3-FL cells is associated with AKT activation and p53 inactivation. |
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MeSH term(s) | Humans ; Organic Anion Transporters, Sodium-Independent/metabolism ; Organic Anion Transporters, Sodium-Independent/pharmacology ; Solute Carrier Organic Anion Transporter Family Member 1B3/pharmacology ; Proto-Oncogene Proteins c-akt/metabolism ; Tumor Suppressor Protein p53/metabolism ; HEK293 Cells ; Microcystins/metabolism ; Okadaic Acid/toxicity ; Epithelial-Mesenchymal Transition ; Phosphoprotein Phosphatases ; Marine Toxins |
Chemical Substances | cyanoginosin LR (EQ8332842Y) ; Organic Anion Transporters, Sodium-Independent ; Solute Carrier Organic Anion Transporter Family Member 1B3 ; Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; Tumor Suppressor Protein p53 ; Microcystins ; Okadaic Acid (1W21G5Q4N2) ; Phosphoprotein Phosphatases (EC 3.1.3.16) ; Marine Toxins |
Language | English |
Publishing date | 2023-12-30 |
Publishing country | England |
Document type | Journal Article |
ZDB-ID | 204479-1 |
ISSN | 1879-3150 ; 0041-0101 |
ISSN (online) | 1879-3150 |
ISSN | 0041-0101 |
DOI | 10.1016/j.toxicon.2023.107592 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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