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Updated: Oct 2, 2025
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A Novel Culture Model for Human Pluripotent Stem Cell Propagation on Gelatin in Placenta-conditioned Media
Published on: August 3, 2015
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Glutamine-dependent signaling controls pluripotent stem cell fate
Vivian Lu1, Irena J Roy2, Alejandro Torres3
1Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA.
Developmental Cell
|February 26, 2022
Summary
Glutamine (Gln) withdrawal biases human pluripotent stem cell differentiation. Ectoderm uniquely synthesizes Gln to sustain itself, acting as a signaling molecule, while other lineages use it as a metabolic precursor.
Area of Science:
- Developmental Biology
- Stem Cell Biology
- Metabolic Signaling
Background:
- Human pluripotent stem cells (hPSCs) possess self-renewal and differentiation capabilities.
- Previous work indicated glutamine (Gln) withdrawal influences hPSC differentiation towards ectoderm.
- Germ lineage-specific metabolic regulation in hPSCs remains incompletely understood.
Purpose of the Study:
- To elucidate the role of intracellular glutamine (Gln) in human pluripotent stem cell (hPSC) differentiation across germ lineages.
- To investigate whether Gln acts as a signaling molecule or metabolic precursor in different germ layers.
- To explore the in vivo relevance of Gln metabolism in human embryonic development.
Main Methods:
- hPSC culture and differentiation assays.
- Assessment of Gln synthesis and utilization across germ lineages.
- Transcriptome analysis of gastrulation-stage human embryos.
- Manipulation of Gln levels and evaluation of differentiation outcomes.
Main Results:
- Ectoderm uniquely synthesizes sufficient Gln for viability and differentiation, unlike mesoderm and endoderm.
- Gln functions as a signaling molecule in ectoderm, overriding cytokine-induced differentiation.
- Mesoderm and endoderm utilize Gln primarily as an α-ketoglutarate precursor.
- In vivo embryonic transcriptome data suggests distinct Gln enzyme expression patterns across germ layers.
Conclusions:
- Intracellular glutamine (Gln) plays a critical, lineage-specific role in coordinating human pluripotent stem cell differentiation.
- Gln's dual function as a metabolic substrate and signaling molecule highlights its importance in developmental processes.
- Nutrient availability, specifically Gln, may directly influence cell fate decisions during human embryonic development.
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