Increased flux of free radicals in cells subjected to hyperthermia: detection by electron paramagnetic resonance spin trapping.

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 Lett

journal_title

FEBS letters

authors

Flanagan SW,Moseley PL,Buettner GR

doi

10.1016/s0014-5793(98)00779-0

subject

Has Abstract

pub_date

1998-07-17 00:00:00

pages

285-6

issue

2

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(98)00779-0

journal_volume

431

pub_type

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