Abstract
1. 1. Circulating [ 14C]glucose 2, 5 and 10 min after intravenous injection of [U- 14C]- l-alanine was greater in 24 hr starved than in fed rats. 2. 2. In vitro uptake of [ 14C]alanine by liver and kidney cortex slices from 24 hr starved and fed rats rose in parallel with increased medium substrate concentration. 3. 3. Formation of [ 14C]glucose from 1 mM [ 14C]alanine was similar in liver and kidney cortex slices and increased in tissues from 24 hr starved compared with fed rats. With 5 mM [ 14C]alanine more [ 14C]glucose was produced by liver than by kidney cortex slices from 24 hr starved rats. Liver slices always produced more [ 14C]lactate and less [ 14C]-CO 2 from [ 14C]alanine than kidney cortex slices. 4. 4. It is proposed that under physiological conditions, the kidneys cortex actively participates in glucose production from alanine.
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