Korean J Oral Maxillofac Radiol.  2001 Sep;31(3):135-143.

The effect of retinoic acid on radiosensitivity analyzed by linear-quadratic model and apoptosis in head and neck squamous carcinoma cell lines

• Lee ES
• Kang BH
• Heo MS
• Lee SS
• Choi HB
• Choi SC
• Park TW

Abstract

PURPOSE: To evaluate the effect of all-trans-retinoic acid on radiosensitivity and radiation-induced apoptosis in NHOK, HEp-2 and FaDu cell lines. Material and Methods : We measured the changes in survival fraction at 2 Gy (SF2), alpha and beta after treatment of retinoic acid (1 microM) prior to irradiation with doses of 2, 4, 6 and 10 Gy and correlated the radiosensitizing effect of retinoic acid with them. Also, apoptosis induction was assayed with the flow cytometry on days 1, 2, 3, 4 and 5 after irradiation (2, 10 and 20 Gy) combined with retinoic acid.
Results
and CONCLUSION: SF2 values for NHOK, HEp-2 and FaDu cell lines were 0.54, 0.64 and 0.41, respectively and the cell line of FaDu was the most radiosensitive. For cell lines of NHOK and HEp-2, pretreatment of cells with retinoic acid resulted in a significant decrease of the SF2 values. The alpha/betaratios of x-ray survival curve were 8.714 (NHOK), 4.098 (HEp-2) and 11.79 (FaDu). The alpha/beta ratio for NHOK decreased on pretreatment with retinoic acid, whereas those for HEp-2 and FaDu increased. Radiation induced apoptosis in all cell lines but, retinoic acid did not affect the apoptosis.

Keyword

apoptosis; retinoid; radiation; ionizing; radiation tolerance

MeSH Terms

Apoptosis*
Carcinoma, Squamous Cell*
Cell Line*
Flow Cytometry
Head*
Neck*
Radiation Tolerance*
Radiation-Sensitizing Agents
Tretinoin*
Radiation-Sensitizing Agents
Tretinoin