Key result
Low-dose irradiation increases day-20 smooth muscle cell proliferation by ~9%, suggesting it merely postpones edge restenosis.
Why the study?
Low dose irradiation of uninjured vascular segments is proposed to minimize edge restenosis, but its effects on smooth muscle cell proliferation and ICAM-1 expression in monocytes are unclear.
Does low dose irradiation affect smooth muscle cell proliferation and monocyte ICAM-1 expression in an in vitro model of coronary atherosclerosis?
Population
Smooth muscle cells from 9 human coronary artery plaques and monocytes from buffy coat leukocytes
Comparison
Irradiation with 1 Gy, 4 Gy, and 10 Gy vs sham-irradiated controls
Design
In vitro preclinical study
Follow-up
Up to 20 days for smooth muscle cells and 4 hours for monocytes
Authors
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LDI may stimulate late SMC proliferation in vitro; leaves open whether extending brachytherapy fields merely delays edge restenosis.
Does low dose irradiation affect smooth muscle cell proliferation and monocyte ICAM-1 expression in an in vitro model of coronary atherosclerosis?
Effect estimate: 9.3% stimulation
p-value: p=<0.05
Low dose irradiation (1 Gy) initially inhibits but later stimulates smooth muscle cell proliferation in vitro, suggesting that extending irradiation margins in vascular brachytherapy may merely postpone rather than prevent edge restenosis.
Voisard et al. (2006) studied Advanced primary stenosing lesions of human coronary arteries (n=9). Low dose irradiation vs. Sham-irradiated cultures was evaluated on Smooth muscle cell proliferation at day 20 after 1 Gy irradiation (9.3% stimulation, p=<0.05). Low dose irradiation with 1 Gy initially inhibited smooth muscle cell proliferation but significantly stimulated it by 9.3% at day 20, suggesting that extending irradiation margins may merely postpone edge restenosis.
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