From biological mechanisms to clinical implications: the role of mineral dust-induced gene in lung cancers

Zhang, Jianjun; Zhao, Hongwen

doi:10.21037/jtd.2017.05.14

Cited by 1 publication

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References 24 publications

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“…Mineral dust-induced gene (mdig) is a newly discovered lung cancer-related gene, which was first found in alveolar macrophages of coal miners (5,6). mdig contains a Jumonji C domain with demethylase function of histone H3K9me3, and can promote the activation of proto-oncogenes (7,8). mdig is also called myc-induced nuclear antigen with a molecular weight of 53 kDa (MINA53) or nuclear protein 52 (NO52) (6,9,10).…”

Section: Introductionmentioning

confidence: 99%

The mineral dust-induced gene, mdig, regulates angiogenesis and lymphangiogenesis in lung adenocarcinoma by modulating the expression of VEGF-A/C/D via EGFR and HIF-1α signaling

et al. 2021

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Mineral dust-induced gene (mdig) is a novel lung cancer-related oncogene. The aim of this study was to explore the effects of mdig on angiogenesis and lymphangiogenesis by vascular endothelial growth factor (VEGF) in lung adenocarcinoma. mdig-overexpressing A549, H1299 and 293T cells, mdig-silenced A549, human umbilical vein endothelial cells (HUVECs) and human lymphatic endothelial cells (HLECs) were cultured under normoxic and hypoxic conditions. Protein expression levels of mdig, epidermal growth factor receptor (EGFR), phospho(p)-EGFR Tyr1068, hypoxia-inducible factor-1α (HIF-1α), VEGF-A/C/D and VEGF-R1/R2/R3 were assessed using western blotting. mRNA expression levels of mdig, EGFR and HIF-1α were measured using RT-qPCR. Tube formation and xenograft tumor experiments were performed to examine the mechanism of mdig in angiogenesis and lymphangiogenesis. Protein expression levels of EGFR, HIF-1α and VEGF-A/C/D were significantly upregulated in cells cultured under hypoxic conditions compared with those cultured under normoxic conditions, whereas the levels of mdig were decreased. Protein expression levels of EGFR, p-EGFR and VEGF-A/R1/R2 were significantly increased in the mdig-overexpressing cells, whereas the levels of HIF-1α and VEGF-C/D/R3 were decreased compared with those in control cells, all of which were reversed in mdig-silenced cells. Tumor volumes and density of angiogenesis in the mdig-overexpressing group were significantly increased compared with those in the control group, whereas the density of lymphangiogenesis was decreased. No tumors formed in the mdig-silenced group after 3 weeks of assessment in vivo. Protein expression levels of EGFR, p-EGFR, VEGF-A and angiogenesis density were significantly reduced in the mdig-overexpressing cells treated with an EGFR inhibitor, whereas the levels of HIF-1α, VEGF-C/D and the lymphangiogenesis density were significantly increased in mdig-overexpressing cells treated with a HIF-1α agonist. All changes in protein expression were reversed in EGFR agonist and HIF-1α inhibitor treated mdig-silenced cells. In conclusion, mdig is an oxygen-sensitive protein that promotes tumor growth and angiogenesis by activating the EGFR/p-EGFR/VEGF-A/VEGF-R1/R2 pathway and inhibits lymphangiogenesis by blocking the HIF-1α/VEGF-C/D/VEGF-R3 pathway.

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