TY  - JOUR
A1  - Schumann, S.
A1  - Eberlein, U.
A1  - Lapa, C.
A1  - Müller, J.
A1  - Serfling, S.
A1  - Lassmann, M.
A1  - Scherthan, H.
T1  - α-Particle-induced DNA damage tracks in peripheral blood mononuclear cells of [\(^{223}\)Ra]RaCl\(_{2}\)-treated prostate cancer patients
JF  - European Journal of Nuclear Medicine and Molecular Imaging
N2  - Purpose
One therapy option for prostate cancer patients with bone metastases is the use of [\(^{223}\)Ra]RaCl\(_{2}\). The α-emitter \(^{223}\)Ra creates DNA damage tracks along α-particle trajectories (α-tracks) in exposed cells that can be revealed by immunofluorescent staining of γ-H2AX+53BP1 DNA double-strand break markers. We investigated the time- and absorbed dose-dependency of the number of α-tracks in peripheral blood mononuclear cells (PBMCs) of patients undergoing their first therapy with [\(^{223}\)Ra]RaCl\(_{2}\).
Methods
Multiple blood samples from nine prostate cancer patients were collected before and after administration of [\(^{223}\)Ra]RaCl\(_{2}\), up to 4 weeks after treatment. γ-H2AX- and 53BP1-positive α-tracks were microscopically quantified in isolated and immuno-stained PBMCs.
Results
The absorbed doses to the blood were less than 6 mGy up to 4 h after administration and maximally 16 mGy in total. Up to 4 h after administration, the α-track frequency was significantly increased relative to baseline and correlated with the absorbed dose to the blood in the dose range < 3 mGy. In most of the late samples (24 h - 4 weeks after administration), the α-track frequency remained elevated.
Conclusion
The γ-H2AX+53BP1 assay is a potent method for detection of α-particle-induced DNA damages during treatment with or after accidental incorporation of radionuclides even at low absorbed doses. It may serve as a biomarker discriminating α- from β-emitters based on damage geometry.
KW  - γ-H2AX
KW  - DNA damage
KW  - nuclear medicine
KW  - dosimetry
KW  - α-Emitter
KW  - biokinetics
KW  - prostate cancer
KW  - [\(^{223}\)Ra]RaCl\(_{2}\)
KW  - 53BP1
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-265462
SN  - 1619-7089
VL  - 48
IS  - 9
ER  -