PURPOSE: Epithelial-to-mesenchymal transition (EMT) is a phenotype that alters cell morphology, disrupts morphogenesis, and increases motility. Our prior studies have shown that the progeny of human mammary epithelial cells (HMECs) irradiated with 2 Gy undergoes transforming growth factor β (TGF-β)-mediated EMT. In this study we determined whether radiation dose or quality affected TGF-β-mediated EMT. METHODS AND MATERIALS: HMECs were cultured on tissue culture plastic or in Matrigel (BD Biosciences, San Jose, CA) and exposed to low or high linear energy transfer (LET) and TGF-β (400 pg/mL). Image analysis was used to measure membrane-associated E-cadherin, a marker of functional epithelia, or fibronectin, a product of mesenchymal cells, as a function of radiation dose and quality. RESULTS: E-cadherin was reduced in TGF-β-treated cells irradiated with low-LET radiation doses between 0.03 and 2 Gy compared with untreated, unirradiated cells or TGF-β treatment alone. The radiation quality dependence of TGF-β-mediated EMT was determined by use of 1 GeV/amu (gigaelectron volt/atomic mass unit) (56)Fe ion particles at the National Aeronautics and Space Administration's Space Radiation Laboratory. On the basis of the relative biological effectiveness of 2 for (56)Fe ion particles' clonogenic survival, TGF-β-treated HMECs were irradiated with equitoxic 1-Gy (56)Fe ion or 2-Gy (137)Cs radiation in monolayer. Furthermore, TGF-β-treated HMECs irradiated with either high- or low-LET radiation exhibited similar loss of E-cadherin and gain of fibronectin and resulted in similar large, poorly organized colonies when embedded in Matrigel. Moreover, the progeny of HMECs exposed to different fluences of (56)Fe ion underwent TGF-β-mediated EMT even when only one-third of the cells were directly traversed by the particle. CONCLUSIONS: Thus TGF-β-mediated EMT, like other non-targeted radiation effects, is neither radiation dose nor quality dependent at the doses examined.
PURPOSE: Epithelial-to-mesenchymal transition (EMT) is a phenotype that alters cell morphology, disrupts morphogenesis, and increases motility. Our prior studies have shown that the progeny of human mammary epithelial cells (HMECs) irradiated with 2 Gy undergoes transforming growth factor β (TGF-β)-mediated EMT. In this study we determined whether radiation dose or quality affected TGF-β-mediated EMT. METHODS AND MATERIALS: HMECs were cultured on tissue culture plastic or in Matrigel (BD Biosciences, San Jose, CA) and exposed to low or high linear energy transfer (LET) and TGF-β (400 pg/mL). Image analysis was used to measure membrane-associated E-cadherin, a marker of functional epithelia, or fibronectin, a product of mesenchymal cells, as a function of radiation dose and quality. RESULTS:E-cadherin was reduced in TGF-β-treated cells irradiated with low-LET radiation doses between 0.03 and 2 Gy compared with untreated, unirradiated cells or TGF-β treatment alone. The radiation quality dependence of TGF-β-mediated EMT was determined by use of 1 GeV/amu (gigaelectron volt/atomic mass unit) (56)Fe ion particles at the National Aeronautics and Space Administration's Space Radiation Laboratory. On the basis of the relative biological effectiveness of 2 for (56)Fe ion particles' clonogenic survival, TGF-β-treated HMECs were irradiated with equitoxic 1-Gy (56)Fe ion or 2-Gy (137)Cs radiation in monolayer. Furthermore, TGF-β-treated HMECs irradiated with either high- or low-LET radiation exhibited similar loss of E-cadherin and gain of fibronectin and resulted in similar large, poorly organized colonies when embedded in Matrigel. Moreover, the progeny of HMECs exposed to different fluences of (56)Fe ion underwent TGF-β-mediated EMT even when only one-third of the cells were directly traversed by the particle. CONCLUSIONS: Thus TGF-β-mediated EMT, like other non-targeted radiation effects, is neither radiation dose nor quality dependent at the doses examined.
Authors: Fanny Bouquet; Anupama Pal; Karsten A Pilones; Sandra Demaria; Byron Hann; Rosemary J Akhurst; Jim S Babb; Scott M Lonning; J Keith DeWyngaert; Silvia C Formenti; Mary Helen Barcellos-Hoff Journal: Clin Cancer Res Date: 2011-10-25 Impact factor: 12.531
Authors: Catherine C Park; Walter Georgescu; Aris Polyzos; Christopher Pham; Kazi M Ahmed; Hui Zhang; Sylvain V Costes Journal: Integr Biol (Camb) Date: 2013-02-13 Impact factor: 2.192
Authors: Salma K Jabbour; Terence M Williams; Mutlay Sayan; Eric D Miller; Jaffer A Ajani; Andrew C Chang; Norman Coleman; Wael El-Rifai; Michael Haddock; David Ilson; Daniel Jamorabo; Charles Kunos; Steven Lin; Geoffrey Liu; Pataje G Prasanna; Anil K Rustgi; Rosemary Wong; Bhadrasain Vikram; Mansoor M Ahmed Journal: J Natl Cancer Inst Date: 2021-06-01 Impact factor: 13.506
Authors: Minli Wang; Megumi Hada; Janapriya Saha; Deepa M Sridharan; Janice M Pluth; Francis A Cucinotta Journal: PLoS One Date: 2012-07-23 Impact factor: 3.240