Cyclic AMP mediates β-adrenergic-induced increases in N-linked protein glycosylation in rat parotid acinar cells
- 15 August 1984
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 222 (1), 17-24
- https://doi.org/10.1042/bj2220017
Abstract
Beta-Adrenergic stimulation of rat parotid cells by isoprenaline (isoproterenol) results in 2-3-fold increases in [3H]mannose incorporation into N-linked oligosaccharides. This occurs without perceptible lag and is linear with time for 60 min after agonist addition. Concomitantly, isoprenaline markedly increases cellular cyclic AMP. Examination of individual proteins by sodium dodecyl sulphate/polyacrylamide-gradient-gel electrophoresis reveals that glycosylation changes are primarily associated with four secretory proteins, of approx. Mr 17000, 32000, 38000 and 220000. Beta-Adrenoreceptor activation additionally elicits a slight increase in parotid protein synthesis. The greatest increase in [14C]leucine incorporation is that into another secretory protein (Mr approx. 24000). Exposure of cells to dibutyryl cyclic AMP yields results comparable with those after isoprenaline treatment. Forskolin, which increases parotid-cell cyclic AMP, also causes similar effects. Conversely, dibutyryl cyclic GMP shows no such response. The data are consistent with the notion that beta-adrenergic stimulation of N-linked protein glycosylation in rat parotid cells is mediated by cyclic AMP.This publication has 3 references indexed in Scilit:
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- beta-Adrenergic regulation of protein phosphorylation and its relationship to exocrine secretion in dispersed rat parotid gland acinar cells.Journal of Biological Chemistry, 1981
- N-Linked glycoprotein assembly. Evidence that oligosaccharide attachment occurs within the lumen of the endoplasmic reticulum.Journal of Biological Chemistry, 1980