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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hamilton, T. H. Skipper, J. K. |
| Abstract | The vitellogenin gene is inactive in the liver of male Xenopus laevis, unless exogenous estrogen is administered. We have previously shown that conventional doses of estradiol-17beta result in the appearance of new hepatic messenger RNAs, some of which are encoded for vitellogenin. We now report that much higher doses of the hormone (2 mg/frog per day for 4 days) are required to elicit maximal responses. The relative levels of membrane-bound polysomes and vitellogenin mRNA were determined as a function of time and dose of hormone. Translation of total polysomal RNA in a cell-free system derived from wheat germ was used to estimate the relative levels of vitellogenin messenger RNA. Faithful translation of this messenger RNA was indicated by two lines of evidence: labeled cell-free products were immunoprecipitated with antivitellogenin antibody, and the migration of the major labeled product in sodium dodecyl sulfate/acrylamide gels was identical to that of native vitellogenin. Our results establish conditions for maximal estrogen-induced responses in this system, and are compatible with the hypothesis that a major regulatory mechanism of steroid hormones in the control of protein synthesis is that of gene activation and regulation of messenger RNA levels. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 6 |
| Volume Number | 74 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1977-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Estradiol Pharmacology Genes Lipoproteins Biosynthesis Liver Metabolism Vitellogenins Animals Cell Fractionation Drug Effects Microscopy, Electron Polyribosomes Ultrastructure Xenopus Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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