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Ectopic microRNA-150-5p transcription sensitizes glucocorticoid therapy response in MM1S multiple myeloma cells but fails to overcome hormone therapy resistance in MM1R cells

(2014) PLOS ONE. 9(12).
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Abstract
Glucocorticoids (GCs) selectively trigger cell death in the multiple myeloma cell line MM1S which express NR3C1/Glucocorticoid Receptor (GR) protein, but fail to kill MM1R cells which lack GR protein. Given recent demonstrations of altered microRNA profiles in a diverse range of haematological malignancies and drug resistance, we characterized GC inducible mRNA and microRNA transcription profiles in GC sensitive MM1S as compared to GC resistant MM1R cells. Transcriptome analysis revealed that GCs regulate expression of multiple genes involved in cell cycle control, cell organization, cell death and immunological disease in MM1S cells, which remain unaffected in MM1R cells. With respect to microRNAs, mir-150-5p was identified as the most time persistent GC regulated microRNA, out of 5 QPCR validated microRNAs (mir-26b, mir-125a-5p, mir-146-5p, mir-150-5p, and mir-184), which are GC inducible in MM1S but not in MM1R cells. Functional studies further revealed that ectopic transfection of a synthetic mir-150-5p mimics GR dependent gene expression changes involved in cell death and cell proliferation pathways. Remarkably, despite the gene expression changes observed, overexpression of mir-150-5p in absence of GCs did not trigger significant cytotoxicity in MM1S or MM1R cells. This suggests the requirement of additional steps in GC induced cell death, which can not be mimicked by mir-150-5p overexpression alone. Interestingly, a combination of mir-150-5p transfection with low doses GC in MM1S cells was found to sensitize therapy response, whereas opposite effects could be observed with a mir-150-5p specific antagomir. Although mir-150-5p overexpression did not substantially change GR expression levels, it was found that mir-150-5p evokes GR specific effects through indirect mRNA regulation of GR interacting transcription factors and hormone receptors, GR chaperones, as well as various effectors of unfolded protein stress and chemokine signalling. Altogether GC-inducible mir-150-5p adds another level of regulation to GC specific therapeutic responses in multiple myeloma.
Keywords
ACUTE LYMPHOBLASTIC-LEUKEMIA, CHRONIC LYMPHOCYTIC-LEUKEMIA, C-MYB, MOLECULAR-MECHANISMS, INDUCED APOPTOSIS, CANCER-CELLS, NONCODING RNA, RECEPTOR, MIR-150, LIGAND-INDEPENDENT ACTIVATION

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Citation

Please use this url to cite or link to this publication:

Chicago
Palagani, Ajay, Ken Op de Beeck, Stefan Naulaerts, Jolien Diddens, Chandra Sekhar Chirumamilla, Guy Van Camp, Kris Laukens, et al. 2014. “Ectopic microRNA-150-5p Transcription Sensitizes Glucocorticoid Therapy Response in MM1S Multiple Myeloma Cells but Fails to Overcome Hormone Therapy Resistance in MM1R Cells.” Plos One 9 (12).
APA
Palagani, A., Op de Beeck, K., Naulaerts, S., Diddens, J., Chirumamilla, C. S., Van Camp, G., Laukens, K., et al. (2014). Ectopic microRNA-150-5p transcription sensitizes glucocorticoid therapy response in MM1S multiple myeloma cells but fails to overcome hormone therapy resistance in MM1R cells. PLOS ONE, 9(12).
Vancouver
1.
Palagani A, Op de Beeck K, Naulaerts S, Diddens J, Chirumamilla CS, Van Camp G, et al. Ectopic microRNA-150-5p transcription sensitizes glucocorticoid therapy response in MM1S multiple myeloma cells but fails to overcome hormone therapy resistance in MM1R cells. PLOS ONE. 2014;9(12).
MLA
Palagani, Ajay et al. “Ectopic microRNA-150-5p Transcription Sensitizes Glucocorticoid Therapy Response in MM1S Multiple Myeloma Cells but Fails to Overcome Hormone Therapy Resistance in MM1R Cells.” PLOS ONE 9.12 (2014): n. pag. Print.
@article{5840069,
  abstract     = {Glucocorticoids (GCs) selectively trigger cell death in the multiple myeloma cell line MM1S which express NR3C1/Glucocorticoid Receptor (GR) protein, but fail to kill MM1R cells which lack GR protein. Given recent demonstrations of altered microRNA profiles in a diverse range of haematological malignancies and drug resistance, we characterized GC inducible mRNA and microRNA transcription profiles in GC sensitive MM1S as compared to GC resistant MM1R cells. Transcriptome analysis revealed that GCs regulate expression of multiple genes involved in cell cycle control, cell organization, cell death and immunological disease in MM1S cells, which remain unaffected in MM1R cells. With respect to microRNAs, mir-150-5p was identified as the most time persistent GC regulated microRNA, out of 5 QPCR validated microRNAs (mir-26b, mir-125a-5p, mir-146-5p, mir-150-5p, and mir-184), which are GC inducible in MM1S but not in MM1R cells. Functional studies further revealed that ectopic transfection of a synthetic mir-150-5p mimics GR dependent gene expression changes involved in cell death and cell proliferation pathways. Remarkably, despite the gene expression changes observed, overexpression of mir-150-5p in absence of GCs did not trigger significant cytotoxicity in MM1S or MM1R cells. This suggests the requirement of additional steps in GC induced cell death, which can not be mimicked by mir-150-5p overexpression alone. Interestingly, a combination of mir-150-5p transfection with low doses GC in MM1S cells was found to sensitize therapy response, whereas opposite effects could be observed with a mir-150-5p specific antagomir. Although mir-150-5p overexpression did not substantially change GR expression levels, it was found that mir-150-5p evokes GR specific effects through indirect mRNA regulation of GR interacting transcription factors and hormone receptors, GR chaperones, as well as various effectors of unfolded protein stress and chemokine signalling. Altogether GC-inducible mir-150-5p adds another level of regulation to GC specific therapeutic responses in multiple myeloma.},
  articleno    = {e113842},
  author       = {Palagani, Ajay and Op de Beeck, Ken and Naulaerts, Stefan and Diddens, Jolien and Chirumamilla, Chandra Sekhar and Van Camp, Guy and Laukens, Kris and Heyninck, Karen and Gerlo, Sarah and Mestdagh, Pieter and Vandesompele, Jo and Vanden Berghe, Wim},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keywords     = {ACUTE LYMPHOBLASTIC-LEUKEMIA,CHRONIC LYMPHOCYTIC-LEUKEMIA,C-MYB,MOLECULAR-MECHANISMS,INDUCED APOPTOSIS,CANCER-CELLS,NONCODING RNA,RECEPTOR,MIR-150,LIGAND-INDEPENDENT ACTIVATION},
  language     = {eng},
  number       = {12},
  pages        = {30},
  title        = {Ectopic microRNA-150-5p transcription sensitizes glucocorticoid therapy response in MM1S multiple myeloma cells but fails to overcome hormone therapy resistance in MM1R cells},
  url          = {http://dx.doi.org/10.1371/journal.pone.0113842},
  volume       = {9},
  year         = {2014},
}

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