Effect of a hypoxic radiosensitizer, AK 2123 (Sanazole), on yeast Saccharomyces cerevisiae.
Sanazole/DNA repair/Hypoxic radiosensitization/DNA polymerases/Saccharomyces cerevisiae Yeast Saccharomyces cerevisiae can exist in two physiological states, namely anaerobic and aerobic. They differ in their response to gamma- radiation and radiomodification. We report hereon our results concerning radiosensitization by Sanazole (AK-2123), a well-known hypoxic radio sensitizer, whose mechanism of action has been studied extensively. The results have revealed that Sanazole (1 mM) when present during irradiation could specifically sensitize wild-type anaerobic yeast cells with a DMF of 2.4. In a radiation-sensitive mutant which lacks a DNA repair pathway specific for the recovery from gamma-radiation induced DNA damage, the extent of sensitization was considerably lower and the DMF was only 1.3. Studies on the liquid holding recovery of cells of both wild- type and rad52 yeast cells exposed to radiation in presence of Sanazole revealed that sensitization by Sanazole is due to a preferential increase in the DNA damage, and not by impairing DNA repair. This system thus holds promise for screening potential hypoxic chemical radiosensitizers.
Pasupathy
K
K
Radiation Biology Division, Bhabha Atomic Research Centre, Mumbai, India.
Nair
C K
CK
Kagiya
T V
TV
D015687:Cell Hypoxia; D011838:Radiation-Sensitizing Agents / Q000494:pharmacology*; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000528:radiation effects; D014230:Triazoles / Q000494:pharmacology*
D011838:Radiation-Sensitizing Agents; D014230:Triazoles; C072690:AK 2123