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MUC1-C IS ESSENTIAL FOR INFLAMMATORY MEMORY OF TYROSINE KINASE INHIBITOR RESISTANCE IN NSCLC CELLS

ABSTRACT: MUC1-C IS ESSENTIAL FOR INFLAMMATORY MEMORY OF TYROSINE KINASE INHIBITOR RESISTANCE IN NSCLC CELLS

PROVIDER: PRJNA1252146 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR33198141_1.fastq.gz	Fastqsanger.gz
	SRR33198141_2.fastq.gz	Fastqsanger.gz
	SRR33198142_1.fastq.gz	Fastqsanger.gz
	SRR33198142_2.fastq.gz	Fastqsanger.gz
	SRR33198143_1.fastq.gz	Fastqsanger.gz

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MUC1-C IS ESSENTIAL FOR INFLAMMATORY MEMORY OF TYROSINE KINASE INHIBITOR RESISTANCE IN NSCLC CELLS

Project description:This study identifies the oncogenic protein MUC1-C as a key driver of resistance to the EGFR tyrosine kinase inhibitor osimertinib in non-small cell lung cancers (NSCLCs).MUC1-C promotes resistance by activating STAT1 and type I/II interferon pathways, creating an inflammatory memory of the resistant phenotype. This memory is maintained via MUC1-C/STAT1 interaction at one enhancer region (pELS-1) and MUC1-C/JUN/PBAF at another (pELS-2) in the MUC1 gene. MUC1-C also mediates resistance to combination EGFR/MET inhibitors and a fourth-generation EGFR TKI (TQB3804). Importantly, targeting MUC1-C with an antibody-drug conjugate (M1C ADC) is effective both in vitro and in a patient-derived xenograft model, making MUC1-C a promising therapeutic target for TKI-refractory NSCLC.

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MUC1-C IS ESSENTIAL FOR ESTABLISHING AND RECALLING INFLAMMATORY MEMORY OF OSIMERTINIB RESISTANCE IN NSCLC CELLS [H1975_vs_H1975-OR]

Project description:MUC1-C is necessary for establishing and recalling resistance of NSCLC cells to osimertinib by driving an inflammatory memory responseThe oncogenic MUC1-C protein functions as a master regulator of NSCLC cell resistance to osimertinib by unclear mechanisms. We report that MUC1-C-mediated regulation of STAT1 and the interferon (IFN) type I/II pathways is necessary for establishing osimertinib resistance. Studies of osimertinib-resistant NSCLC cells selected for growth in the absence of drug further demonstrate that revertant cells are dependent on MUC1-C for recalling resistance to osimertinib. We show that establishing and recalling osimertinib resistance is dependent on activation of the MUC1 gene at (i) a proximal enhancer-like signature 1 (pELS-1) by MUC1-C and STAT1 and (ii) a pELS-2 by MUC1-C, JUN/AP-1 and PBAF. The MUC1 pELS regions function as memory domains for activation of MUC1-C and downstream STAT1 and IFN stimulated genes in conferring osimertinib resistance. Of clinical relevance, we report that the MUC1-C-driven inflammatory responses are induced in patient-derived, osimertinib-resistant MGH170 NSCLC cells with MET amplification. Our results further demonstrate that MGH170 cells are dependent on the MUC1-C-induced inflammatory response for resistance to the osimertinib and combination of osimertinib with the MET inhibitor capmatinib. These findings indicate that MUC1-C is necessary for establishing and recalling resistance of NSCLC cells to osimertinib by driving an inflammatory memory response.

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MUC1-C IS ESSENTIAL FOR ESTABLISHING AND RECALLING INFLAMMATORY MEMORY OF OSIMERTINIB RESISTANCE IN NSCLC CELLS [H1975-RT_vs_H1975-OR]

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Project description:Introduction: Overcoming of acquired resistance to EGFR-tyrosine kinase inhibitors (EGFR-TKIs) is an intractable obstacle for many clinical oncologists. The mechanisms of resistance to EGFR-TKIs are very complex. Long non-coding RNAs (lncRNAs) may play an important role in cancer development and metastasis. However, the biological process between lncRNAs and drug resistance to EGFR mutated lung cancer largely unknown. Methods: Osimertinib and afatinib-resistant EGFR-mutated lung cancer cells were established using by a stepwise method. Microarray analysis of non-coding and coding RNAs was performed using parental and resistant EGFR-mutant NSCLC cells. Results: Microarray analysis was evaluated by bioinformatics analysis through medical-industrial collaboration. CRNDE and DGCR5 lncRNAs were highly expressed in EGFR-TKIs-resistant cells. CRNDE binds to eIF4A3 protein, down-regulates eIF4A3 and MUC1 expression, and down-regulates p-EGFR expression. CRNDE inhibition activated the eIF4A3/MUC1/EGFR signaling pathway and apoptotic activity and restored sensitivity to EGFR-TKIs. Conclusions: We identified lncRNA CRNDE associated with resistance to EGFR-TKIs in EGFR-mutant NSCLC cells. CRNDE may be a novel therapeutic target for EGFR mutant NSCLC patients.

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Fms-like tyrosine kinase 3 (Flt3) contributes to a receptor tyrosine kinase signature regulating the cardiac side population

Project description:Fms-like tyrosine kinase 3 (Flt3) is a regulator of hematopoietic progenitor cells. It is a target of tyrosine kinase inhibitors (TKIs) used for acute myeloid leukemia treatment. Flt3 and its ligand (Flt3L) are expressed in the heart and cardiac side effects occur under Flt3-targeting TKIs. Whether Flt3/Flt3L also regulate cardiac progenitor cells (CPCs), however, is not known. The cardiac side population (SP) is a pool of heterogenous CPCs that can give rise to all cardiac lineages, hence contributing to cardiovascular homeostasis. Here we show that SP-CPCs produce and are responsive to Flt3L. Compared to wild-type, SP-CPCs from flt3L-/- mice are less abundant, with less contribution of CD45-CD34+ cells, and lower expression of gene sets related to epithelial-to-mesenchymal transition, cardiovascular development and stem cell differentiation. Upon culturing and compared to wild-type, flt3L-/- Sca1+CD31- SP-CPCs show increased proliferation and less vasculogenic commitment, but differentiation can be induced in the presence of receptor tyrosine kinase-activating growth factors. The observed differences are associated with decreased microvascularisation and global systolic function of flt3L-/- hearts. Thus, Flt3 contributes to a receptor tyrosine kinase signature necessary for the maintenance and functionality of SP-CPCs. These findings have potential implications regarding cardiovascular side effects observed under TKI therapy.

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