Abstract
The concentration of insulin in portal vein blood decreases 50–60% in fed or fasted rats as they age from 12- to 24-months. The binding capacity of purified hepatic plasma membrane for insulin decreases approximately 60% as rats age from 2- to 24-months, whereas the dissociation constant for insulin is not altered. It is proposed that these factors may contribute significantly to previously documented examples of age-dependent modifications in liver enzyme regulation.
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