Abstract
The spontaneous secretion of lipoprotein lipase has been examined in adipose cells of mouse Ob17, Ob17SA and 3T3-F442A clonal lines as well as in rat adipose cells in primary culture. Striking differences are observed both in serum-free and serum-supplemented media, rat adipose cells and 3T3-F442A cells being the most active. Insulin from 10 −11M to 10 −9M was able to modulate the rate of LPL secretion from 2- to 4-fold. The stimulatory effect of insulin on this process occurred within 30 min in cells treated or not with cycloheximide. It is concluded that insulin is able to modulate the rate of LPL secretion independently of the synthesis of new enzyme molecules on a short-term basis and within a physiological range of concentrations.
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