The effect of retinoic acid on radiosensitivity analyzed by linear-quadratic model and apoptosis in head and neck squamous carcinoma cell lines.
- Author:
Eun Sook LEE
1
;
Bum Hyun KANG
;
Min Suk HEO
;
Sam Sun LEE
;
Hyun Bae CHOI
;
Soon Chul CHOI
;
Tae Won PARK
Author Information
1. Department of Oral and Maxillofacial Radiology, College of Dentistry, Seoul National University, Korea. raychoi@snu.ac.kr
- Publication Type:Original Article
- Keywords:
apoptosis;
retinoid;
radiation;
ionizing;
radiation tolerance
- MeSH:
Apoptosis*;
Carcinoma, Squamous Cell*;
Cell Line*;
Flow Cytometry;
Head*;
Neck*;
Radiation Tolerance*;
Radiation-Sensitizing Agents;
Tretinoin*
- From:Korean Journal of Oral and Maxillofacial Radiology
2001;31(3):135-143
- CountryRepublic of Korea
- Language:Korean
-
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.
