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Glucose affects monocarboxylate cotransporter (MCT) 1 expression during mouse preimplantation development
Sarah Jansen1, Tahereh Esmaeilpour, Marie Pantaleon
1School of Biomedical Sciences, University of Queensland, Brisbane 4072, QLD, Australia.
Reproduction (Cambridge, England)
|March 4, 2006
Summary
Embryonic development relies on monocarboxylate transporters (MCTs) for nutrient uptake. Glucose availability regulates MCT1 expression, crucial for pH balance and monocarboxylate transport during early development.
Area of Science:
- Embryology
- Cellular Metabolism
- Molecular Biology
Background:
- Early embryos require pyruvate and lactate, switching to glucose as they develop.
- Monocarboxylate transporters (MCTs) facilitate the transport of substrates like lactate and pyruvate.
- Understanding MCT roles is vital for comprehending embryonic metabolic shifts.
Purpose of the Study:
- To investigate the transport characteristics of DL-lactate in embryos.
- To examine the mRNA expression and protein localization of MCT1 and MCT3 during preimplantation development.
- To clarify the role of MCT proteins in embryonic development and their regulation by glucose.
Main Methods:
- Confocal laser scanning immunofluorescence was used to analyze MCT1 and MCT3.
- Transport characteristics for DL-lactate were assessed using kinetic analysis (Km).
- Embryos were collected and cultured in vitro, with and without glucose, to observe metabolic and transporter changes.
Main Results:
- Blastocysts showed a higher affinity for DL-lactate compared to zygotes.
- MCT1 mRNA and protein were detected throughout preimplantation development in the presence of glucose, with distinct localization patterns.
- MCT1 expression was significantly reduced or absent in the absence of glucose, correlating with morula survival.
Conclusions:
- MCT1 plays a critical role in regulating pH and monocarboxylate transport during preimplantation development.
- Glucose availability appears to control MCT1 expression, but not MCT3 expression.
- MCT3 was not detected in early embryos, suggesting a specialized role or later expression.