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. 1973 Dec 1;59(3):708–721. doi: 10.1083/jcb.59.3.708

SECRETORY PROTEIN SYNTHESIS IN THE STIMULATED RAT PAROTID GLAND

Temporal Dissociation of the Maximal Response from Secretion

John H Lillie 1, Seong S Han 1
PMCID: PMC2109117  PMID: 4761337

Abstract

Administration of the β-adrenergic drug, isoproterenol (IPR), affects the release of 98% of stored amylase from rat parotid gland acinar cells. A period of 6 h elapses from the onset of secretion to the maximum [14C]phenylalanine (Phe) incorporation into total protein and amylase. 10 h after IPR administration the rate of [14C]Phe incorporation into total protein was no longer elevated above that of control. Incorporation into amylase, however, remained elevated above the control by 2.3 times. This latent period may reflect: (a) reduced amounts of available ATP which occurs as a result of the process of secretion as well as (b) the time required for reorganization of cellular organelles and membranes after secretion. The latent period after IPR-induced secretion appears similar to the latent period which has recently been reported to occur after physiologic release of amylase from the parotid gland during the diurnal feeding cycle of the rat. These observations support the existence of a positive feedback system operant in the parotid acinar cell linking the release of secretory proteins with their synthesis. The period of greatest protein synthesis is, however, temporally dissociated from the secretory process.

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Selected References

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