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The role of nitric oxide in the metabolism of labeled glucose in isolated rat uterus. Influence of 17β-estradiol

1995; Elsevier BV; Volume: 50; Issue: 4 Linguagem: Inglês

10.1016/0090-6980(95)00122-0

1878-416X

Ezequiel González, Alicia Jawerbaum, Virginia Novaro, A. Faletti, M.A.F. Gimeno,

Estrogen and related hormone effects

The influence of nitric oxide (NO) on the production of 14CO2 from labeled glucose in uteri isolated from ovariectomized-estrogenized rats was studied. Nitroprusside, an NO donor (NP), 200 μM increased the formation of labeled CO2 from [U-14C]glucose. This effect was blunted by hemoglobin (Hb) 20 μg/mL, an NO scavenger. The addition of N-monomethyl arginine (NMMA), an inhibitor of NO synthase decreased the stimulatory action of NP at 400 mM. Incubation of uterine strips in the presence of NP plus acetylsalicylic acid (ASA) 10−4 M (a cyclooxygenase inhibitor), inhibited the stimulatory action of NP on glucose metabolism. PGE2 (10−7 M) added to the incubation medium containing NP and ASA reversed the effect of the inhibitor. Neither NP nor Hb nor NMMA modified the 14CO2 production from labeled glucose in uterine strips from ovariectomized rats. The addition of NP to the incubating medium increased PGE accumulation by uterine strips from rats treated with estradiol, but not in ovariectomized animals. These results suggest that NO exerts a positive influence on glucose metabolism and PGE synthesis in isolated rat uteri from estrogenized animals.