Dosimetry of heavy ion exposure to human cells using nanoscopic imaging of double strand break repair protein clusters

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F22%3A00554301" target="_blank" >RIV/61389005:_____/22:00554301 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1038/s41598-022-05413-6" target="_blank" >https://doi.org/10.1038/s41598-022-05413-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41598-022-05413-6" target="_blank" >10.1038/s41598-022-05413-6</a>

Result language

angličtina

Original language name

Dosimetry of heavy ion exposure to human cells using nanoscopic imaging of double strand break repair protein clusters

Original language description

The human body is constantly exposed to ionizing radiation of different qualities. Especially the exposure to high-LET (linear energy transfer) particles increases due to new tumor therapy methods using e.g. carbon ions. Furthermore, upon radiation accidents, a mixture of radiation of different quality is adding up to human radiation exposure. Finally, long-term space missions such as the mission to mars pose great challenges to the dose assessment an astronaut was exposed to. Currently, DSB counting using gamma H2AX foci is used as an exact dosimetric measure for individuals. Due to the size of the gamma H2AX IRIF of similar to 0.6 mu m, it is only possible to count DSB when they are separated by this distance. For high-LET particle exposure, the distance of the DSB is too small to be separated and the dose will be underestimated. In this study, we developed a method where it is possible to count DSB which are separated by a distance of similar to 140 nm. We counted the number of ionizing radiation-induced pDNA-PKcs (DNA-PKcs phosphorylated at T2609) foci (size = 140 nm +/- 20 nm) in human HeLa cells using STED super-resolution microscopy that has an intrinsic resolution of 100 nm. Irradiation was performed at the ion microprobe SNAKE using high-LET 20 MeV lithium (LET= 116 keV/mu m) and 27 MeV carbon ions (LET= 500 keV/mu m). pDNA-PKcs foci label all DSB as proven by counterstaining with 53BP1 after low-LET gamma-irradiation where separation of individual DSB is in most cases larger than the 53BP1 gross size of about 0.6 mu m. Lithium ions produce (1.5 +/- 0.1) IRIF/mu m track length, for carbon ions (2.2 +/- 0.2) IRIF/mu m are counted. These values are enhanced by a factor of 2-3 compared to conventional foci counting of high-LET tracks. Comparison of the measurements to PARTRAC simulation data proof the consistency of results. We used these data to develop a measure for dosimetry of high-LET or mixed particle radiation exposure directly in the biological sample. We show that proper dosimetry for radiation up to a LET of 240 keV/mu m is possible.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

30224 - Radiology, nuclear medicine and medical imaging

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Scientific Reports

ISSN

2045-2322

e-ISSN

2045-2322

Volume of the periodical

12

Issue of the periodical within the volume

1

Country of publishing house

DE - GERMANY

Number of pages

15

Pages from-to

1305

UT code for WoS article

000747291900088

EID of the result in the Scopus database

2-s2.0-85123698558