[No authors listed]
A mild cold stress can have positive effects on longevity, aging and resistance to severe stresses in flies (heat, cold, fungal infection), but the causes of these effects remain elusive. In order to know whether these effects could be explained by the DIF transcription factor (a NF-κB-like factor in the Toll innate immunity pathway), the Dif ( 1 ) mutant and its control cn bw strain were subjected to a pretreatment by cold. The DIF factor seems to be involved in the response to fungal infection after a mild cold stress and in the resistance to heat. However, DIF seems to have no role in the increased longevity of non-infected flies and resistance to a severe cold shock, because the cold pretreatment slightly increased longevity in females, mainly in Dif ( 1 ) ones, and resistance to a long cold shock in both sexes of these strains.
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