MT3 melatonin binding site, MT1 and MT2 melatonin receptors are present in oocyte, but only MT1 is present in bovine blastocyst produced in vitro

Reproductive Biology and Endocrinology

Otávio Mitio Ohashi²  Lucia de Fatima S Sampaio³  Moysés S Miranda²  Dhúllia Stefanne B Conceição²  Rafael V Sampaio¹ 

[1] Faculty of Animal Science and Food Engineering, University of São Paulo, Pirassununga, SP, Brazil;Lab. Fertilização in vitro, Instituto de Ciências Biológicas, Universidade Federal do Pará, Federal do Pará, Brazil;Lab. Bioquímica do Desenvolvimento do Sistema Nervoso, Instituto de Ciências Biológicas, Universidade Federal do Pará, Rua Augusto Corrêa 1. CEP: 66075-900, Belém, PA, Brazil

关键词: Mechanisms of development;    NQO2;    MT2 melatonin receptor;    MT1 melatonin receptor;    Antioxidant;    Melatonin;   

Others  :  1149711
DOI  :  10.1186/1477-7827-10-103

 received in 2012-08-18, accepted in 2012-11-27,  发布年份 2012

【 摘 要 】

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.

【 授权许可】

   
2012 Sampaio et al; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

Figure 3.

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