Maternal tamoxifen treatment alters oocyte differentiation in the neonatal mice: Inhibition of oocyte development and decreased folliculogenesis
Notice bibliographique
Résumé
AIM: Primary germ cells after migration to the developing ovary differentiate to oogonia and oocytes. The formation and number of primordial follicles in early fetal life are determining factors in the fertility state of adult life. Tamoxifen is used both to stimulate ovulation and as an anticancer drug. The aim of the present study was to evaluate the effect of tamoxifen on oocyte and follicular development and differentiation in mice. METHODS: Thirty adult female and 15 adult male mice were used in the present study. The female mice were divided into two groups: control and experimental. Two female mice at their sterous cycle were placed with one male mouse in a cage for mating. The observation of a vaginal plug was considered the 1st day of pregnancy. On the 13th day of pregnancy the mice received 100 microg tamoxifen by i.p. injection. At the end of pregnancy 2-, 3-, 6- and 7-day-old newborns were killed and their ovaries were fixed and prepared for light and electron microscopic studies. The number of follicular nests and diameter of primordial and primary follicles were determined using Motic software (Motic Incorporation Ltd, Canada) and compared with control values using t-test. RESULTS: Microscopy and morphometry showed that oocyte nests are formed on the 2nd and 3rd days and follicles are distinguished on the 6th and 7th days. Morphometric studies revealed that the number and diameters of oocyte nests were significantly (P < 0.001) reduced in the experimental groups compared to the control group. However, the numbers and diameters of primordial and primary follicles in experiential and controls were not significantly different. Electron microscopic studies revealed that in the control group, oocytes were separated from each other and were at primordial follicle stage. However, in the experimental group, the oocytes were in clusters as oocyte nests. CONCLUSION: The results indicate that tamoxifen suppresses follicular differentiation at early stages but does not affect the development of already differentiated follicles.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».