Analysis of Inositol Phosphate Metabolism in Melanotrope Cells of Xenopus laevis in Relation to Background Adaptation
| Autor: | H. Vaudry, L. Desrues, Eric W. Roubos, C. M. A. Mauger, Bruce G. Jenks, M. C. Tonon, H. P. Koning, P. M. J. M. Cruijsen |
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| Rok vydání: | 1993 |
| Předmět: |
Apomorphine
Acclimatization Dopamine Inositol Phosphates Phospholipid Xenopus Color General Biochemistry Genetics and Molecular Biology Xenopus laevis chemistry.chemical_compound History and Philosophy of Science Animals Inositol Melanocyte-Stimulating Hormones Inositol phosphate chemistry.chemical_classification biology General Neuroscience Inositol phosphate metabolism Metabolism biology.organism_classification Kinetics chemistry Biochemistry Pituitary Gland Phosphorylation Isonicotinic Acids Adaptation |
| Zdroj: | Annals of the New York Academy of Sciences. 680:188-198 |
| ISSN: | 1749-6632 0077-8923 |
| DOI: | 10.1111/j.1749-6632.1993.tb19684.x |
| Popis: | The present study examined inositol phosphate metabolism in melanotrope cells of Xenopus laevis to determine if inositol phosphates are involved in regulating the biosynthetic or secretory activity of these cells. No correlation could be found between inositol phosphate metabolism and the secretory activity of the melanotrope cells. Therefore, we conclude that inositol phosphate production is not directly involved in the regulation of release of alpha-MSH from these cells. However, there were dramatic differences in the capacity of the melanotrope cells to produce inositol phosphates dependent on the state of background adaptation of the animals from which the melanotropes were derived; cells from white-adapted animals had a low capacity to produce inositol phosphates, whereas melanotropes from black-adapted animals had a high capacity in this regard. During adaptation of animals from a white to a black background, the capacity of the melanotrope cells to produce inositol phosphates was only very slowly acquired, reminiscent of the slow acquisition displayed by these cells to produce POMC during background adaptations. Likewise, during black to white background adaptation, the melanotrope cells very slowly lost the capacity to phosphorylate inositol, which correlates with the slow loss of the biosynthetic capacity of melanotrope cells during such adaptations. Altogether we conclude that inositol phospholipid metabolism is likely involved in the regulation of the biosynthetic processes of melanotrope cells of Xenopus laevis. |
| Databáze: | OpenAIRE |
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