Regulation of the aminolevulinate synthase gene in the Syrian hamster Harderian gland: Changes during development and circadian rhythm and role of some hormones
| Autor: | Rosa M. Sainz, Carmen Rodríguez, Monica Lidia Kotler, Armando Menendez-Pelaez, Isaac Antolín |
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| Rok vydání: | 1996 |
| Předmět: |
Male
Aging medicine.medical_specialty Histology Hamster Biology Gene Expression Regulation Enzymologic Melatonin Harderian gland Estrus Cricetinae Internal medicine Gene expression medicine Animals Circadian rhythm Gonadal Steroid Hormones Instrumentation Testosterone Estrous cycle Mesocricetus Harderian Gland Suprachiasmatic nucleus Circadian Rhythm Medical Laboratory Technology Endocrinology Female Anatomy 5-Aminolevulinate Synthetase medicine.drug |
| Zdroj: | Microscopy Research and Technique. 34:65-70 |
| ISSN: | 1097-0029 1059-910X |
| DOI: | 10.1002/(sici)1097-0029(19960501)34:1<65::aid-jemt9>3.0.co;2-v |
| Popis: | The Syrian hamster Harderian gland has been advocated as a model to study the porphyrin biosynthetic pathway, since it shows by far the highest porphyrin concentration known to date. Another particular characteristic is the sexual dimorphism at both the morphological and the biochemical levels. We found a variation in the ALV-S (aminolevulinate synthase) gene expression according to sex, with females exhibiting much higher mRNA levels than do males. After castration, ALV-S mRNA rose considerably in males, this increase being inhibited by darkness or treatment with melatonin. Treatment with hCG or progesterone did not vary the ALV-S mRNA levels in females. Castrated males, however, showed a much larger increase when they were treated with hCG. No variations have been found in the expression of the ALV-S gene in female HG throughout the estrous cycle. During development, males and females showed similar ALV-S mRNA levels until they were 20 days old. Afterwards, they started showing gender-associated differences. In females, ALV-S mRNA levels rose during the first 3 months of life, and thereafter they decreased progressively with aging. A circadian rhythm has been found in the gene expression of ALV-S mRNA in females, showing very low levels in the morning and reaching a peak during the first hours of darkness. It was an endogenous rhythm, probably regulated at the transcriptional level. It is proposed that the light-dark period duration modulates this rhythm through the suprachiasmatic nucleus which in turn acts on the pineal secretion of melatonin that regulates ALV-S gene expression. |
| Databáze: | OpenAIRE |
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