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Fluorescent latex microparticles: A non-invasive short-term cell lineage marker suitable for use in the mouse early
Tom P Fleming1, Martin A George1
1Department of Anatomy, University of Cambridge, Downing Street, CB2 3DY, Cambridge, Great Britain.
Abstract:
We have examined the potential of fluorescent latex microparticles for use as a short term cell lineage marker in the mouse preimplantation embryo. Isolated blastomeres and intact embryos rapidly adsorb and subsequently endocytose the particles (0.2 μm diameter) from a monodisperse suspension in normal medium, so that cytoplasmic endocytic organelles, but not the cytosol itself, becomes labelled. Latex fluorescence, either within intact embryos, disaggregated cells or thick resin sections, is stable during UV irradiation. The development of labelled embryos, both in terms of sequential morphological changes and their time of expression, was comparable to controls and resulted in blastocysts with normal cell numbers and capacity for tissue differentiation. Latex fluorescence is preserved within all the progeny of labelled blastomeres over several cell cycles (e.g. from 8-cell stage to 64-cell stage) and is not transmitted to unlabelled cells either by exocytosis or via midbodies. The particles are particularly suitable for labelling exclusively the entire population of outside cells in the intact embryo from the 16-cell stage onwards.
Insights
Fluorescent latex microparticles effectively label mouse preimplantation embryo cells for short-term lineage tracing. These particles are stable, non-toxic, and accurately track cell development without affecting embryo viability.
Area of Science:
- Developmental Biology
- Cell Biology
- Biotechnology
Background:
- Cell lineage tracing is crucial for understanding embryonic development.
- Existing methods for short-term lineage marking in early embryos have limitations.
Purpose of the Study:
- To evaluate fluorescent latex microparticles as a short-term cell lineage marker in mouse preimplantation embryos.
- To assess the stability, safety, and efficacy of these particles for tracking cell fate.
Main Methods:
- Mouse embryos at various preimplantation stages were incubated with fluorescent latex microparticles (0.2 μm).
- Labeling efficiency, particle stability under UV irradiation, and effects on embryonic development were assessed.
- Cellular uptake mechanisms (adsorption and endocytosis) were investigated.
Main Results:
- Microparticles were rapidly adsorbed and endocytosed by blastomeres, labeling cytoplasmic organelles.
- Latex fluorescence remained stable during UV irradiation and was preserved across multiple cell cycles.
- Labeled embryos developed normally, showing comparable morphological changes and cell numbers to controls.
- Particles were not transmitted to unlabeled cells, ensuring specific lineage marking.
- Exclusive labeling of outer cells was achieved from the 16-cell stage onwards.
Conclusions:
- Fluorescent latex microparticles are a suitable and reliable tool for short-term cell lineage tracing in mouse preimplantation embryos.
- The method is safe, does not impede normal embryonic development, and allows for precise tracking of cell populations.
