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Related Experiment Videos

Glutamine transport by mouse inner cell masses

M B Jamshidi1, P L Kaye

  • 1Department of Physiology and Pharmacology, University of Queensland, Brisbane, Australia.

Journal of Reproduction and Fertility
|May 1, 1995
PubMed
Summary

Mouse blastocysts utilize specific systems for glutamine uptake. This study identifies system Bo,+ as predominant in both inner cell masses and trophectoderm, with early evidence of system A in the inner cell mass.

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Area of Science:

  • Developmental Biology
  • Cell Physiology
  • Molecular Transport

Background:

  • Glutamine is crucial for blastocyst macromolecular synthesis and energy metabolism.
  • Understanding glutamine transport is key to early embryonic development.

Purpose of the Study:

  • To compare glutamine uptake in mouse blastocysts and isolated inner cell masses.
  • To characterize the specific glutamine transport systems in the inner cell mass.

Main Methods:

  • Utilized substrate competition and kinetic studies to identify transport systems.
  • Measured Na(+)-dependent glutamine uptake in isolated inner cell masses and whole blastocysts.
  • Investigated the effects of specific inhibitors like tryptophan, lysine, 2-amino-2-norbornanecarboxylic acid, and MeAIB.

Main Results:

  • Inner cell masses exhibit Na(+)-dependent facilitated glutamine uptake, primarily via system Bo,+.
  • System Bo,+ is expressed in both trophectoderm and inner cell mass components.
  • A Na(+)-dependent uptake sensitive to MeAIB, characteristic of system A, was identified in the inner cell mass, suggesting its early embryonic appearance.

Conclusions:

  • System Bo,+ is the predominant glutamine transporter in mouse blastocysts, present in both trophectoderm and inner cell mass.
  • The inner cell mass shows the initial embryonic expression of system A, a common transporter in somatic cells.
  • These findings elucidate the molecular mechanisms of nutrient acquisition essential for early embryonic development.

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