Abstract:
:It has been hypothesized that hyperthermia promotes oxygen-centered free radical formation in cells; however, to date there is no direct evidence of this heat-induced increase in oxygen free radical flux. Using electron paramagnetic resonance (EPR) spin trapping, we sought direct evidence for free radical generation during hyperthermia in intact, functioning cells. Rat intestinal epithelial cell monolayers were exposed to 45 degrees C for 20 min, after which the nitrone spin trap 5,5-dimethyl-1-pyrroline N-oxide (DMPO) was added. Compared to control cells at 37 degrees C, heat-exposed cells had increased free radical EPR signals, consistent with the formation of DMPO/.OH (aN = aH = 14.9 G). These findings indicate that heat increases the flux of cellular free radicals and support the hypothesis that increased generation of oxygen-centered free radicals and the resultant oxidative stress may mediate in part, heat-induced cellular damage.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Flanagan SW,Moseley PL,Buettner GRdoi
10.1016/s0014-5793(98)00779-0subject
Has Abstractpub_date
1998-07-17 00:00:00pages
285-6issue
2eissn
0014-5793issn
1873-3468pii
S0014-5793(98)00779-0journal_volume
431pub_type
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