MT3 melatonin binding site, MT1 and MT2 melatonin receptors are present in oocyte, but only MT1 is present in bovine blastocyst produced in vitro
| Autor: | Dhúllia Stefanne B Conceição, Otávio Mitio Ohashi, R. V. Sampaio, Lucia de Fatima Sobral Sampaio, Moysés dos Santos Miranda |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
MT1 melatonin receptor
medicine.medical_specialty endocrine system Receptors Melatonin Mechanisms of development Fertilization in Vitro Biology Antioxidants Embryo Culture Techniques Melatonin Endocrinology Cell surface receptor Internal medicine medicine Animals Blastocyst Quinone Reductases MT2 melatonin receptor Receptor Receptor Melatonin MT2 Receptor Melatonin MT1 Research Obstetrics and Gynecology Embryo Oocyte Free radical scavenger Cell biology medicine.anatomical_structure Reproductive Medicine Melatonin binding embryonic structures Oocytes Cattle Female NQO2 Antioxidant hormones hormone substitutes and hormone antagonists medicine.drug Developmental Biology |
| Zdroj: | Reproductive Biology and Endocrinology : RB&E |
| ISSN: | 1477-7827 |
| DOI: | 10.1186/1477-7827-10-103 |
| Popis: | Background Melatonin inclusion into in vitro oocyte maturation (IVM) protocols has been suggested because it possesses a powerful free radical scavenger capability that improves the quality of the oocyte used in in vitro embryo production (IVP). The aim of our study was to investigate the presence of melatonin membrane receptors (MT1and MT2) and MT3, which is the melatonin binding site of NQO2 enzyme, in both oocytes and hatched blastocysts to consider an additional subcellular mechanism responsible for the effects of melatonin on IVP. Methods The presence of the high affinity melatonin receptors was investigated through an autoradiographic binding assay, using the non-permeable ligand [125I]-iodomelatonin (17 pM) in embryos. The kind of melatonin site was investigated in oocytes and embryos by immunocytochemistry. In vitro fertilized bovine embryos produced from in vitro maturated oocytes supplemented with melatonin (0.0001 to 1000 nM) were analysed to determine their cleavage and blastocyst formation rates. Results The [125I]-iodomelatonin (17 pM) binding in blastocysts was blocked by pre-incubation with melatonin (30000 nM), showing the presence of the high affinity melatonin receptors. MT1, MT2 and NQO2 immunoreactivity was observed in oocytes. MT1 immunoreactivity was observed in hatched blastocysts, however MT2 and NQO2 were not observed in this embryonic stage. Melatonin (pM) triggered significant difference in both cleavage and blastocysts formation rates. Conclusions The high affinity MT1 melatonin receptor must be taking part in IVM events; furthermore it is the first melatonin receptor to appear during bovine embryo development in vitro. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|