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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Peterson, S. W. Kyriakis, J. M. Hausman, R. E. |
| Description | Author Affiliation: Kyriakis JM ( Biological Sciences Center, Boston University, MA 02215.); |
| Abstract | The effect of insulin on the appearance of the enzyme choline acetyltransferase (ChoAcT; acetyl-CoA:choline O-acetyltransferase, EC 2.3.1.6) in embryonic chicken retina neurons cultured in defined medium was studied. In the presence of a minimal level of insulin (1 ng/ml), ChoAcT activity increased with time in culture. A correspondence between the insulin concentration in the defined medium (1-100 ng/ml) and both the rate of increase and maximum attained level of ChoAcT activity was observed. Maximal ChoAcT activity was 2- to 3-fold greater in cells cultured in the presence of 100 ng of insulin per ml than in cells cultured in the presence of 1 ng of insulin per ml. To elicit maximum ChoAcT activity, insulin at 100 ng/ml was required in the medium for only the first 4 days of the culture period, at which time insulin could be reduced to maintenance levels (10 ng/ml) without affecting ChoAcT activity. Insulin binding assays performed during a 7-day culture period revealed that irrespective of the insulin concentration in the medium during culture, cell-surface insulin receptors decreased by approximately 90% between 4 and 7 days in culture. This decrease in insulin binding corresponded to the observed decrease in the sensitivity of ChoAcT activity to insulin. Our findings suggest that insulin plays a role in mediating cholinergic differentiation in the embryonic chicken retina. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 84 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1987-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Choline O-Acetyltransferase Metabolism Insulin Pharmacology Receptor, Insulin Retina Enzymology Retinal Ganglion Cells Animals Binding, Competitive Cells, Cultured Chick Embryo Analogs & Derivatives Kinetics Embryology Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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