Abstract:
:The effect of underfeeding over glucose metabolism in uteri isolated from ovariectomized and non-ovariectomized rats subjected to a restricted diet for 25 days (50% of the normal food intake), was studied. Underfeeding decreases (14)CO(2) formation from U(14) C-glucose in intact animal uteri. While in ovariectomized rats (25 days), the effect is the opposite. The addition of morphine 10(-6) M to the medium does not affect rats fed ad libitum. However, (14)CO(2) levels increase significantly in intact animals receiving a restricted diet. In ovariectomized rats morphine does not show any activity, regardless of the type of diet rats were subjected to. None of the rat groups seems to be sensitive to naloxone 10(-6) M. The s.c. injection of morphine (4 mg.kg (-1)) increases glucose metabolism only in intact rats provided with a restricted diet, while naloxone (2.5 mg.kg (-1) ) produces a decrease of ( 14)CO(2) in ovariectomized underfed animals. To conclude, morphine either 'in vivo' or 'in vitro' is active only in uteri from intact rats subjected to underfeeding. Naloxone produces a decrease in (14)CO(2) production, particularly when it is s.c. injected to ovariectomized rats undergoing a dietary restriction. Since the uterus does not react to naloxone, the effect of the opiod blocker may be the result of endogenous opioids originated in other tissues.
journal_name
Arch Physiol Biochemjournal_title
Archives of physiology and biochemistryauthors
Campos ML,Casalino-Matsuda SM,Linares JA,Goldraij Adoi
10.1076/apab.108.5.422.4295subject
Has Abstractpub_date
2000-12-01 00:00:00pages
422-8issue
5eissn
1381-3455issn
1744-4160journal_volume
108pub_type
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