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NALP3 inflammasome upregulation and CASP1 cleavage of the glucocorticoid receptor cause glucocorticoid resistance in leukemia cells
Journal article   Peer reviewed

NALP3 inflammasome upregulation and CASP1 cleavage of the glucocorticoid receptor cause glucocorticoid resistance in leukemia cells

Steven W Paugh, Erik J Bonten, Daniel Savic, Laura B Ramsey, William E Thierfelder, Prajwal Gurung, R K Subbarao Malireddi, Marcelo Actis, Anand Mayasundari, Jaeki Min, …
Nature genetics, Vol.47(6), pp.607-614
06/2015
DOI: 10.1038/ng.3283
PMCID: PMC4449308
PMID: 25938942
url
http://hdl.handle.net/1765/88148View
Open Access

Abstract

Glucocorticoids are universally used in the treatment of acute lymphoblastic leukemia (ALL), and resistance to glucocorticoids in leukemia cells confers poor prognosis. To elucidate mechanisms of glucocorticoid resistance, we determined the prednisolone sensitivity of primary leukemia cells from 444 patients newly diagnosed with ALL and found significantly higher expression of CASP1 (encoding caspase 1) and its activator NLRP3 in glucocorticoid-resistant leukemia cells, resulting from significantly lower somatic methylation of the CASP1 and NLRP3 promoters. Overexpression of CASP1 resulted in cleavage of the glucocorticoid receptor, diminished the glucocorticoid-induced transcriptional response and increased glucocorticoid resistance. Knockdown or inhibition of CASP1 significantly increased glucocorticoid receptor levels and mitigated glucocorticoid resistance in CASP1-overexpressing ALL. Our findings establish a new mechanism by which the NLRP3-CASP1 inflammasome modulates cellular levels of the glucocorticoid receptor and diminishes cell sensitivity to glucocorticoids. The broad impact on the glucocorticoid transcriptional response suggests that this mechanism could also modify glucocorticoid effects in other diseases.
Up-Regulation Inflammasomes - metabolism NLR Family, Pyrin Domain-Containing 3 Protein Humans Child, Preschool Caspase 1 - metabolism Drug Resistance, Neoplasm Infant Receptors, Glucocorticoid - metabolism Neoplasm Recurrence, Local - enzymology Precursor Cell Lymphoblastic Leukemia-Lymphoma - drug therapy DNA Methylation Proteolysis Base Sequence HEK293 Cells Transcription, Genetic Tumor Cells, Cultured Precursor Cell Lymphoblastic Leukemia-Lymphoma - pathology Child Infant, Newborn Antineoplastic Agents, Hormonal - pharmacology Gene Expression Regulation, Leukemic Prednisolone - pharmacology Carrier Proteins - metabolism Adolescent Precursor Cell Lymphoblastic Leukemia-Lymphoma - enzymology Drug Screening Assays, Antitumor

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