L-histidinol potentiates hyperthermic cell-killing in-vitro
S Kohnoe1, Y Maehara, I Takahashi
1KYUSHU UNIV,FAC MED,DEPT SURG 2,FUKUOKA 812,JAPAN.
International Journal of Oncology
|May 17, 2011
Summary
L-histidinol enhances hyperthermic cell killing in vitro, particularly at 43°C, by affecting cell cycle progression. This compound potentiates heat
Area of Science:
- Cell Biology
- Cancer Research
- Hyperthermia Therapy
Background:
- Hyperthermia is a cancer treatment modality.
- Understanding agents that enhance hyperthermic cell killing is crucial.
- L-histidinol's role in modulating cellular responses to heat requires clarification.
Purpose of the Study:
- To investigate the effect of L-histidinol on hyperthermic cell killing in vitro.
- To determine optimal conditions for L-histidinol's enhancement of heat therapy.
- To elucidate the mechanism underlying L-histidinol's potentiation of hyperthermia.
Main Methods:
- Clonogenic survival assays were performed on HeLa and mouse sarcoma-180 cells.
- Cells were exposed to heat (41-43°C) with varying concentrations of L-histidinol.
- Flow cytometry was used to analyze cell cycle distribution.
Main Results:
- L-histidinol significantly reduced cell survival when combined with heat at 43°C.
- Optimal concentrations were 9 mM for HeLa and 3 mM for S-180 cells, with minimal toxicity alone.
- L-histidinol modulated cell cycle progression, attenuating G2/M accumulation and preserving G1 fraction under heat stress.
Conclusions:
- L-histidinol potentiates hyperthermic cell killing in vitro.
- The mechanism involves L-histidinol's influence on cell cycle transit during heat exposure.
- L-histidinol shows potential as an adjunct to hyperthermia treatment.
