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Sökning: WFRF:(Stenerlöw Bo) > The α-emitter Ra-22...

The α-emitter Ra-223 induces clustered DNA damage and significantly reduces cell survival

Abramenkovs, Andris (författare)
Uppsala universitet,Medicinsk strålningsvetenskap,Bo Stenerlöw
Spiegelberg, Diana, 1982- (författare)
Uppsala universitet,Medicinsk strålningsvetenskap,Öron-, näs- och halssjukdomar,Göran Laurell
Nilsson, Sten (författare)
Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden,Sten Nilsson
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Stenerlöw, Bo (författare)
Uppsala universitet,Medicinsk strålningsvetenskap,Bo Stenerlöw
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 (creator_code:org_t)
Engelska.
  • Annan publikation (övrigt vetenskapligt/konstnärligt)
Abstract Ämnesord
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  • The bone-seeking radiopharmaceutical Xofigo (Radium-223 dichloride) has demonstrated both extended survival and palliative effects in treatment of bone metastases in patients with prostate cancer. The alpha-particle emitter Ra-223, administered as Ra-223 dichloride, targets regions undergoing active bone remodeling and strongly binds hydroxyapatite found in bone. However, the mechanisms mediating toxicity and properties of Ra-223 binding to hydroxyapatite are not fully understood. In the current study, we show that the alpha-particles originating from the Ra-223 decay chain produce a track-like distribution of the DNA damage response proteins 53BP1 and ɣH2AX and induce high amounts of clustered DNA double-strand breaks in prostate cancer cell nuclei. The Ra-223 treatment inhibited growth of prostate cancer cells, grown in 2D- and 3D- models in vitro, independent of prostate cancer cell type and androgen receptor variant 7 (ARv7) expression. The rapid binding with a high affinity of Ra-223 to bone structures was verified in an in silico assay (KD= 19.2 ± 6.5 e-18) and almost no dissociation was detected within 24 hours. Importantly, there was no significant uptake of Ra-223 in cells. Further, we demonstrate the importance of the local dose-distribution of this treatment; there was more than 100-fold increase in cell killing when Ra-223 was attached to the bone-like hydroxyapatite structure, compared to when the radioactivity was distributed in the cell growth media. However, independent of the exposure condition, the high cell killing efficacy of the Ra-223 was attributed to the clustered DNA damaged sites induced by the released α-particles.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)

Nyckelord

Prostate cancer
ARv7
DNA damage
Ra-223
high-LET
Medical Cell Biology
Medicinsk cellbiologi

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