Transient genome-wide transcriptional response to low-dose ionizing radiation in vivo in humans.
OBJECTIVE
The in vivo effects of low-dose low linear energy transfer ionizing radiation on healthy human skin are largely unknown. Using a patient-based tissue acquisition protocol, we have performed a series of genomic analyses on the temporal dynamics over a 24-hour period to determine the radiation response after a single exposure of 10 cGy.


METHODS
RNA from each patient tissue sample was hybridized to an Affymetrix Human Genome U133 Plus 2.0 array. Data analysis was performed on selected gene groups and pathways.


RESULTS
Nineteen gene groups and seven gene pathways that had been shown to be radiation responsive were analyzed. Of these, nine gene groups showed significant transient transcriptional changes in the human tissue samples, which returned to baseline by 24 hours postexposure.


CONCLUSIONS
Low doses of ionizing radiation on full-thickness human skin produce a definable temporal response out to 24 hours postexposure. Genes involved in DNA and tissue remodeling, cell cycle transition, and inflammation show statistically significant changes in expression, despite variability between patients. These data serve as a reference for the temporal dynamics of ionizing radiation response following low-dose exposure in healthy full-thickness human skin.
Berglund
Susanne R
SR
Department of Radiation Oncology, University of California Davis Cancer Center, Sacramento, CA 95817, USA.
Rocke
David M
DM
Dai
Jian
J
Schwietert
Chad W
CW
Santana
Alison
A
Stern
Robin L
RL
Lehmann
Joerg
J
Hartmann Siantar
Christine L
CL
Goldberg
Zelanna
Z
D001706:Biopsy; D004307:Dose-Response Relationship, Radiation; D015894:Genome, Human / Q000235:genetics / Q000528:radiation effects*; D006801:Humans; D018499:Linear Energy Transfer; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D011829:Radiation Dosage; D015398:Signal Transduction / Q000528:radiation effects; D012867:Skin / Q000473:pathology / Q000528:radiation effects*; D013997:Time Factors; D014158:Transcription, Genetic / Q000528:radiation effects*; D015854:Up-Regulation