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Mammary Epithelial Cell Lineage Analysis via the Lyon's Hypothesis
Andrea L George1, Gilbert H Smith1
1Mammary Stem Cell Biology Section, BRL, CCR, NCI, NIH, Bethesda, MD 20892, USA.
International Journal of Stem Cell Research and Therapy
|July 26, 2016
Summary
Mammary gland development involves specific cell lineages. This study shows mammary fat pad transplants reveal cap cells, derived from a lacZ-marked X chromosome clone, form TEB and duct basal cells, confirming their precursor role.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- Understanding mammary gland development and stem cell potential is crucial.
- Previous research suggested cap cells as precursors for mammary duct basal cells.
Purpose of the Study:
- To investigate the clonal origin and differentiation potential of mammary gland epithelial cells.
- To confirm the role of cap cells in mammary duct formation using genetic lineage tracing.
Main Methods:
- Transplantation of mammary fat pads from H253 transgenic mice (heterozygous for lacZ-labeled X chromosome) into immune-compromised hosts.
- Analysis of lacZ expression via X-gal staining to trace cellular lineage.
- Microscopic examination of mammary outgrowths at various time points.
Main Results:
- The lacZ-marked X chromosome was confined to a single epithelial clone.
- This clone gave rise to cap cells in terminal end buds (TEB) and basal cells of ducts.
- Luminal cells in ducts showed no lacZ expression, indicating derivation from silenced X chromosomes.
Conclusions:
- Mammary gland development involves distinct progenitor populations.
- Cap cells are confirmed as the precursors of basal (myoepithelial) cells in mammary ducts.
- This lineage tracing supports a model of mammary gland development originating from specific stem cell populations.
