title: IRP2 as a potential modulator of cell proliferation, apoptosis and prognosis in nonsmall cell lung cancer.
abstract: IREB2is a gene that produces iron regulatory protein 2 (IRP2), which is critical to intracellular iron homeostasis and which relates to the rate of cellular proliferation.IREB2lies in a lung cancer susceptibility locus. The aims were to assess 1) the relationship between iron loading, cell proliferation and IRP2 expression in lung cancer; 2) the potential of iron related pathways as therapeutic targets; and 3) the relevance of IRP2 in operated lung cancer patients.Cells of two nonsmall cell cancer (NSCLC) lines and primary bronchial epithelial cells (PBECs) were cultured with and without iron; and proliferation, apoptosis and migration were assessed. Reverse transcriptase PCR and Western blot were used to assess expression of iron homeostasis genes/proteins. Iron chelation and knockdown ofIREB2were usedin vitroto explore therapeutics. A cohort of operated NSCLC patients was studied for markers of systemic iron status, tumour IRP2 staining and survival.Iron loading caused cell proliferation in cancer cell lines, which were less able to regulateIREB2expression than PBECs. Iron chelation resulted in a return of proliferation rates to baseline levels; knockdown ofIREB2had a similar effect. IRP2-positive tumours were larger (p=0.045) and higher percentage staining related to poorer survival (p=0.079).Loss of iron regulation represents a poor prognostic marker in lung cancer.
authors.affiliation: University of Birmingham, Birmingham, UK heenakhiroya@doctors.org.uk.|Both authors contributed equally.
authors.forename: Heena
authors.identifier: 0000-0001-7613-1881
authors.initials: H
authors.lastname: Khiroya
authors.affiliation: University of Birmingham, Birmingham, UK.|Both authors contributed equally.
authors.forename: Jasbir S
authors.initials: JS
authors.lastname: Moore
authors.affiliation: Walsall Hospitals NHS Trust, Walsall, UK.
authors.forename: Nabeel
authors.initials: N
authors.lastname: Ahmad
authors.affiliation: Barts and the London School of Medicine and Dentistry, London, UK.
authors.forename: Jamie
authors.initials: J
authors.lastname: Kay
authors.affiliation: Heart of England NHS Foundation Trust, Birmingham, UK.
authors.forename: Kerry
authors.initials: K
authors.lastname: Woolnough
authors.affiliation: Heart of England NHS Foundation Trust, Birmingham, UK.
authors.forename: Gerald
authors.initials: G
authors.lastname: Langman
authors.affiliation: Heart of England NHS Foundation Trust, Birmingham, UK.
authors.forename: Iyad
authors.initials: I
authors.lastname: Ismail
authors.affiliation: University of Birmingham, Birmingham, UK.|Heart of England NHS Foundation Trust, Birmingham, UK.
authors.forename: Babu
authors.initials: B
authors.lastname: Naidu
authors.affiliation: University of Birmingham, Birmingham, UK.
authors.forename: Chris
authors.initials: C
authors.lastname: Tselepis
authors.affiliation: University of Birmingham, Birmingham, UK.|Heart of England NHS Foundation Trust, Birmingham, UK.
authors.forename: Alice M
authors.initials: AM
authors.lastname: Turner
mesh_terms: D000368:Aged; D017209:Apoptosis; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D002460:Cell Line; D049109:Cell Proliferation; D004847:Epithelial Cells / Q000378:metabolism; D005260:Female; D015870:Gene Expression; D055785:Gene Knockdown Techniques; D006801:Humans; D007501:Iron / Q000378:metabolism*; D035942:Iron Regulatory Protein 2 / Q000235:genetics* / Q000378:metabolism; D008168:Lung / Q000473:pathology; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models
chemical_list: D007501:Iron; C546174:IREB2 protein, human; D035942:Iron Regulatory Protein 2