RESUMO
Objective To investigate the dose-response relationship of the treatment temperatures and heating time on human cervical carcinoma hela cells,aiming at providing experimental evidences for clinical hy-perthermia. Methods Hela cells were heated at 37 ～ 70 ℃ in temperature-controlled water baths, the tempera-ture was divided into nine groups,each time was divided into eight subgroups (1 ～ 30 min). The morphology changes of cells after hyperthermia were detected by inverted microscope. Proliferation rates were measured by MTT colorimetric assay. The apoptesis rates were determined by flow eytometric analyse. The levels of prolifera-ring cell nuclear antigen (PCNA) were measured with immunohistochemistry. Results lnereaseing the heating time at the same temperature, or increaseing heating temperature at the same time, the cell proliferation, survival rates and PCNA expression decreased. There was no significant morphological change about cells ,but have small amount of apoptosis and a direct role of the suppression and destruction at 41 ℃ and 43 ℃ group. A large num-ber of cells shrinked to round and a major role for apoptosis at 46℃ group. Cell necrosis was major role at 50 ℃and 55 ℃ group. More than 55 ℃ for necrotic cells. Conclusion With the increase of heating temperature and heating time, its treatment of Hela cells gradually enhance. So combining dose-effect relationship of hyperthermia temperature and time can reach the best therapeutic effects.
RESUMO
As a quantitative evaluation approach for tumor hyperthermia,thermal dosimetry is a critieat part of the treatment planning system and plays a key role in governing the relationships between thermal exposure(temperature and time of exposure)and thermal damage.Its principal theories,parameters as well as thermal dosimetry models are potentially to accurately describe the tumor hyperthermia effectiveness and therefore greatly improve the clinical experience and prescription for tumor hyperthermia.The deep study and wide clinical application of thermal dosimetry in hyperthermia will further standardize tumor hyperthermia and benefit the patients more.