Rhenium-188 for inhibition of human aortic smooth muscle cell proliferation.
OBJECTIVE
To evaluate dose-dependent growth-modulating effects of the beta-gamma emitter Rhenium-188 on cultured human aortic smooth muscle cells (haSMC).


METHODS
HaSMC were plated in 25 cm(2) flasks. Two days after plating, cells were incubated with the Re-188 (beta E(max) 2.12 MeV, tissue range(max) < 10 mm, T(1/2) 17 h) for five days. The doses administered were 0.2 Gy, 1, 4, 6, 8, 16, and 32 Gy. After five days, the radionuclide was removed. Cell growth, cell cycle distribution, and clonogenic activity were analyzed for the following 25 days.


RESULTS
The 0.2 and 1 Gy groups did not show relevant growth-inhibiting effects compared to the control groups. The 4 to 32 Gy groups presented dose-dependent growth inhibition, with a complete growth arrest of the 16 and 32 Gy groups. Clonogenic activity of the smooth muscle cell was strongly inhibited from doses > or =8 Gy. Flow cytometry showed a lasting dose-dependent G2/M phase block.


CONCLUSIONS
Smooth muscle cell (SMC) growth can be controlled effectively with Re-188 for at least 25 days after radiation in vitro. As the first four weeks after arterial angioplasty are crucial concerning neointimal formation, Re-188 may be a valuable radionuclide to inhibit restenosis after arterial angioplasty.
Wiskirchen
J
J
Department of Diagnostic Radiology, Eberhard-Karls University, Hoppe-Seyler Str. 3, 72076 Tuebingen, Germany. jakub.wiskirchen@uni-tuebingen.de
Dittmann
H
H
Kehlbach
R
R
Vogel-Claussen
J
J
Gebert
R
R
Dohmen
B M
BM
Schöber
W
W
Bares
R
R
Rodemann
H P
HP
Claussen
C D
CD
Duda
S H
SH
D001011:Aorta / Q000166:cytology / Q000528:radiation effects*; D002455:Cell Division / Q000528:radiation effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007399:Interphase / Q000528:radiation effects; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000528:radiation effects*; D011853:Radiobiology; D011868:Radioisotopes / Q000494:pharmacology*; D012211:Rhenium / Q000494:pharmacology*
D011868:Radioisotopes; D012211:Rhenium