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IQGAP3 interacts with Rad17 to activate the MRN/ATM/Chk2 signaling and promote radioresistance in lung cancer

ABSTRACT: IQ motif containing GTPase activating protein 3 (IQGAP3) has been implicated in diverse cellular processes including neuronal morphogenesis, cell proliferation and motility as well as epithelial-mesenchymal transition. However, its roles in DNA damage and repair remain to be clarified. Here, we demonstrate that IQGAP3 is frequently overproduced and predicts poor prognosis in lung cancer patients. Functionally, we provide evidence that depletion of IQGAP3 impairs tumorigenesis and overcomes radioresistance in lung cancer in vitro and in vivo. Mechanistically, we uncover that IQGAP3 interacts with and controls the stability of Rad17 to activate the ATM/Chk2 signaling by recruiting Mre11-Rad50-Nbs1 (MRN) complex in response to DNA damage. Moreover, Rad17 is identified as the major downstream effector that mediates the functions of IQGAP3 in lung cancer. Clinically, IQGAP3 overexpression positively correlates with Rad17 protein levels in human lung cancer tissues. Collectively, these data support key roles for IQGAP3 in promoting tumorigenesis and radioresistance in lung cancer by stabilizing the Rad17 protein and suggest targeting IQGAP3 is a promising therapeutic strategy for lung cancer radiotherapy.

ORGANISM(S): Homo sapiens

PROVIDER: GSE137802 | GEO | 2019/09/21

REPOSITORIES: GEO

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IQGAP3 interacts with Rad17 to activate the MRN/ATM/Chk2 signaling and promote radioresistance in lung cancer

Project description:IQGAP3 interacts with Rad17 to activate the MRN/ATM/Chk2 signaling and promote radioresistance in lung cancer

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Project description:We reported earlier that IQGAP3 is an important stem cell factor in rapidly proliferating isthmus stem cells in the stomach. Furthermore, we observed robust induction of IQGAP3 expression in terminally differentiated chief cells and de-differentiated cells following tissue damage. The elevated expression of IQGAP3 in cancer and its association with metastasis suggest a fundamental role for IQGAP3 in proliferating cancer stem cells. What causes the upregulation of IQGAP3 in cancer is unclear. Here, we show that IGF2BP1 and IQGAP3 expression levels are highest in the blastocyst, with both showing decreases during adulthood. This suggests that IQGAP3, like IGF2BP1, is an early developmental gene that is aberrantly upregulated upon reexpression of IGF2BP1 during carcinogenesis. We found that IGF2BP1 binds and stabilizes m 6 A-modified IQGAP3 transcripts. Furthermore, downstream targets of IGF2BP1, namely SRF and FOXM1, also upregulate IQGAP3 expression. These multiple layers of IQGAP3 regulation, which may safeguard against inappropriate stem cell proliferation, present additional drug targets to inhibit IQGAP3-driven malignant growth.

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Oncofetal protein IGF2BP1 regulates IQGAP3 expression to maintain stem cell potential in cancer [RIP-Seq]

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The Iqgap3-Ras axis drives stem cell proliferation in the stomach corpus during homeostasis and repair [RNA-Seq]

Project description:Objective: Tissue stem cells are central regulators of organ homeostasis. We looked for a protein that is exclusively expressed and functionally involved in stem cell activity in rapidly proliferating isthmus stem cells in the stomach corpus. Design: We uncovered the specific expression of Iqgap3 in proliferating isthmus stem cells through immunofluorescence and in situ hybridization. We performed lineage tracing and transcriptomic analysis of Iqgap3+ isthmus stem cells with the Iqgap3-2A-tdTomato mouse model. Depletion of Iqgap3 revealed its functional importance in maintenance and proliferation of stem cells. We further studied Iqgap3 expression and the associated gene expression changes during tissue repair after tamoxifen-induced damage. Immunohistochemistry revealed elevated expression of Iqgap3 in proliferating regions of gastric tumors from patient samples. Results: Iqgap3 is a highly specific marker of proliferating isthmus stem cells during homeostasis. Iqgap3+ isthmus stem cells give rise to major cell types of the corpus unit. Iqgap3 expression is essential for the maintenance of stem potential. The Ras pathway is a critical partner of Iqgap3 in promoting strong proliferation in isthmus stem cells. The robust induction of Iqgap3 expression following tissue damage indicates an active role for Iqgap3 in tissue regeneration. Conclusion: IQGAP3 is a major regulator of stomach epithelial tissue homeostasis and repair. The upregulation of IQGAP3 in gastric cancer suggests that IQGAP3 plays an important role in cancer cell proliferation.

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The Iqgap3-Ras axis drives stem cell proliferation in the stomach corpus during homeostasis and repair [SMART-SeqII]

2021-03-08 | GSE161443 | GEO

USP9X-mediated KDM4C deubiquitination promotes lung cancer radioresistance by epigenetically inducing TGFβ2 transcription

Project description:Radioresistance is regarded as the main barrier to effective radiotherapy in lung cancer. However, the underlying mechanisms of radioresistance remain elusive. Here, we show that lysine-specific demethylase 4C (KDM4C) is overexpressed and correlated with poor prognosis in lung cancer patients. We provide evidence that genetical or pharmacological inhibition of KDM4C impairs tumorigenesis and radioresistance in lung cancer in vitro and in vivo. Moreover, we uncover that KDM4C upregulates TGFβ2 expression by directly reducing H3K9me3 level at the TGFβ2 promoter and then activates TGF-β/Smad/ATM signaling to confer radioresistance in lung cancer. Using tandem affinity purification technology, we further identify deubiquitinase USP9X as a critical binding partner which deubiquitinates and stabilizes KDM4C. More importantly, depletion of USP9X impairs TGF-β/Smad signaling and radioresistance by destabilizing KDM4C in lung cancer cells. Thus, our findings demonstrate that USP9X-mediated KDM4C deubiquitination activates TGF-β/Smad signaling to promote radioresistance, suggesting that targeting KDM4C may be a promising radiosensitization strategy in the treatment of lung cancer.

2021-07-14 | GSE136404 | GEO

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2022-09-16 | GSE137505 | GEO

Genome-wide expression analysis in murine brain in E14.5 vs. 10.5m old mice

Project description:NBS1 (Nbn in Mus musculus) is a critical component of the MRN (MRE11/RAD50/NBS1) complex, which regulates ATM- and ATR-mediated DNA damage response (DDR) pathways. NBS1 mutations cause the human genomic instability syndrome Nijmegen Breakage Syndrome (NBS), in which microcephaly and intellectual disability are marked neuronal deficits. NBS1 is essential for life, because of its function in the DDR to ensure proliferation and preventing the cell death of replicating cells. However, the function of NBS1 in postmitotic cells is unclear. To explore the possible role of Nbs1 in non-dividing cells and the effection of its deletion on gene expression, RNA-seq was carried out to compare the expression of Nbs1 and other DDR molecules in developing and adult brain.

2020-08-20 | GSE137506 | GEO

Effect of IQGAP3 silencing on HaCaT keratinocytes under normal conditions or inflammatory cytokine stimulation

Project description:Scaffold protein IQGAP3 mediates assembly of multiprotein complexes, orchestrating intracellular signaling pathways. Earlier we have found it to be overexpressed in lesional psoriatic skin. IQGAP3 is involved in cell proliferation and chemokine signaling that are key processes in psoriasis, so we decided to investigate the molecular basis of its role in psoriatic phenotype of keratinocytes. Transcriptome profiling of HaCaT keratinocytes allowed us to identify a wide range of psoriasis-associated pathways to be altered in IQGAP3-knockdown cells. NFkB signaling, EGFR signaling, p38/MAPK and ERK1/ERK2 activation, lipid metabolism and cytokine production as well as the response to the inflammatory cytokine stimulation were altered in the knockdown cells. Real-time analysis of cell growth revealed the alterations of proliferation and wound healing. The balance between proliferation and apoptosis of skin cells was altered, as well as the skin barrier functions and the production of IL-6 and IFNg. However, the diversity of the pathway alterations in the knockdown cells led us to the conclusion that IQGAP3 may not be the best target for the therapeutic inhibition to normalize the phenotype of keratinocytes in psoriasis.

2024-04-22 | GSE248548 | GEO

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Project description:Rad50 is a component of the conserved MRE11-RAD50-NBS1 (MRN) complex, which functions in genome stability and the cell’s ability to deal with stalled DNA replication forks. We identified Rad50 as a factor important for R-loop tolerance and thus mapped DNA:RNA hybrids in Rad50KO cells and compare them to previously reported wild-type and Sgs1KO profiles.

2019-10-31 | E-MTAB-7885 | biostudies-arrayexpress

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