Tissue-specific regulation of vasoactive intestinal peptide messenger ribonucleic acid levels by estrogen in the rat
| Autor: | Susan Kasper, C Ikejiani, Henry G. Friesen, A Torsello, R A Popescu, Maria Vrontakis |
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| Přispěvatelé: | Kasper, S, Popescu, R, Torsello, A, Vrontakis, M, Ikejiani, C, Friesen, H |
| Jazyk: | angličtina |
| Rok vydání: | 1992 |
| Předmět: |
Pituitary gland
medicine.medical_specialty Transcription Genetic medicine.drug_class Vasoactive intestinal peptide Hypothalamus Neuropeptide Biology Endocrinology Pituitary Gland Anterior Ileum Internal medicine Gene expression medicine Hypothalamu Animals Northern blot RNA Messenger BIO/14 - FARMACOLOGIA Messenger RNA Animal Brain Estrogens Estrogen Rats medicine.anatomical_structure Gene Expression Regulation Organ Specificity Rat Female hormones hormone substitutes and hormone antagonists Vasoactive Intestinal Peptide |
| Popis: | The early and chronic effects of 17 beta-estradiol on vasoactive intestinal peptide (VIP) gene expression in rats were examined. Total RNA of four VIP-producing tissues were subjected to Northern blot analysis 15 and 30 min, and 1, 3, 6, and 24 h after a single injection of 17 beta-estradiol (100 micrograms/kg ip). Pituitary, hypothalamus, brain, and ileum VIP messenger RNA (mRNA) levels rose in a time-dependent manner after estrogen treatment. In the pituitary, the increase was maximal at 30-60 min, whereas in the hypothalamus, the increase reached significance only at 3 h but then persisted until at least 24 h. In the brain, a transient increase in VIP mRNA was observed at 30 min, whereas VIP mRNA levels in the ileum responded in a biphasic pattern; the initial early increase was followed by a second elevation occurring at 6 h. A smaller 1-kilobase VIP-related transcript particularly abundant in the pituitary was regulated in parallel with the 1.7-kilobase mature VIP mRNA species. Continuous estrogen stimulation for 7 weeks dramatically increased both mRNA species in the pituitary but did not affect VIP mRNA levels in the other tissues. These data suggest that the regulation of VIP gene expression by transient increases in estrogen levels is rapid and that the pattern of induction is tissue specific. |
| Databáze: | OpenAIRE |
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