For over a century since the discovery of X-rays by Roentgen, students in radiological sciences have been taught that the quintessential target for radiation induced genetic damages resides in the DNA of the nucleus. The biological consequences of cytoplasmic damage are largely unknown. Using a precision charged particle microbeam, the applicant and his co-investigators have previously shown that targeted cytoplasmic irradiation induces mutations in the nucleus of the same hit cell in a process involving reactive oxygen and nitrogen species. Recent preliminary data suggest that the consequence of these damages can result in a non-targeted/ bystander response and that progeny of hit cells show an increase in genomic instability. The overall goals of this competitive renewal application are i) to characterize the induction of genomic instability in a human small airway epithelial model induced by cytoplasmic irradiation;2) to define the role of mitochondrial alterations (fusion/ fission) and the subsequent functional alterations induced by cytoplasmic irradiation;and 3) to determine signaling pathways induced by cytoplasmic irradiation that result in the biological response. A series of three interrelated specific aims are proposed to elucidate three testable hypotheses;linking the three themes of the application: genomic instability, mitochondrial damage and inflammatory signaling pathways. A state of the art charge particle microbeam that can deliver a precise number of alpha particles with a beam size of ~ 1 micrometer and a precision greater than 98% provides an unprecedented opportunity to address an issue that has been of interest to radiobiologists for decades: the differential biological effects of nuclear versus cytoplasmic damage. A major paradigm shift in radiation biology in the last decade has resulted from the elucidation of the biological consequence of targeted cytoplasmic irradiation and discovery of the bystander effect. Together with the genomic instability and bystander effects, the study will address some of the fundamental issues regarding extranuclear target and how cytoplasmic damages are being processed in mammalian cells. Such studies are critically important understanding the cellular response to DNA damages and in low dose radiation risk assessment.

Public Health Relevance

Generations of students in radiation biology have been taught that heritable biological effects induced by ionizing radiation are the consequence of a direct radiation-nuclear interaction. Using the Columbia University charged particle microbeam, there is evidence that targeted cytoplasmic irradiation is mutagenic in mammalian cells. This first, unequivocal demonstration of an extranuclear effect of ionizing radiation provides strong support of the subsequent, broad reaching bystander/ non-targeted effects of radiation. There is suggestive evidence that targeted cytoplasmic irradiation can induce a bystander effect as well as genomic instability among the progeny of hit cells many generations later Results of this proposed study will address some of the fundamental issues regarding extranuclear target and how cytoplasmic damages are being processed in mammalian cells.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
2R01ES012888-06A1
Application #
8290678
Study Section
Cancer Etiology Study Section (CE)
Program Officer
Shaughnessy, Daniel
Project Start
2004-05-03
Project End
2017-03-31
Budget Start
2012-06-18
Budget End
2013-03-31
Support Year
6
Fiscal Year
2012
Total Cost
$362,250
Indirect Cost
$137,250
Name
Columbia University (N.Y.)
Department
Radiation-Diagnostic/Oncology
Type
Schools of Medicine
DUNS #
621889815
City
New York
State
NY
Country
United States
Zip Code
10032
Wu, Jinhua; Hei, Tom K (2018) Focus small to find big - the microbeam story. Int J Radiat Biol 94:782-788
Pei, Hailong; Hu, Wentao; Guo, Ziyang et al. (2018) Long Noncoding RNA CRYBG3 Blocks Cytokinesis by Directly Binding G-Actin. Cancer Res 78:4563-4572
Ivanov, Vladimir N; Wu, Jinhua; Hei, Tom K (2017) Regulation of human glioblastoma cell death by combined treatment of cannabidiol, ?-radiation and small molecule inhibitors of cell signaling pathways. Oncotarget :
Wu, Jinhua; Zhang, Qin; Wuu, Yen-Ruh et al. (2017) Cytoplasmic Irradiation Induces Metabolic Shift in Human Small Airway Epithelial Cells via Activation of Pim-1 Kinase. Radiat Res 187:441-453
Liao, Wupeng; Hei, Tom K; Cheng, Simon K (2017) Radiation-Induced Dermatitis is Mediated by IL17-Expressing ?? T Cells. Radiat Res 187:454-464
Ivanov, Vladimir N; Wu, Jinhua; Hei, Tom K (2017) Regulation of human glioblastoma cell death by combined treatment of cannabidiol, ?-radiation and small molecule inhibitors of cell signaling pathways. Oncotarget 8:74068-74095
Wu, Jinhua; Zhang, Bo; Wuu, Yen-Ruh et al. (2017) Targeted cytoplasmic irradiation and autophagy. Mutat Res 806:88-97
Hei, Tom K (2016) Response of Biological Systems to Low Doses of Ionizing Radiation. Health Phys 110:281-2
Ivanov, Vladimir N; Hei, Tom K (2015) Regulation of viability, differentiation and death of human melanoma cells carrying neural stem cell biomarkers: a possibility for neural trans-differentiation. Apoptosis 20:996-1015
Wang, Tony J C; Wu, Cheng-Chia; Chai, Yunfei et al. (2015) Induction of Non-Targeted Stress Responses in Mammary Tissues by Heavy Ions. PLoS One 10:e0136307

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