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Updated: Apr 19, 2026

In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
Published on: September 28, 2017
Luminal signaling: it's what's on the inside that counts
Jennifer M Symonds1, Matthew P Hoffman1
1Matrix and Morphogenesis Section, NIDCR, NIH, Bethesda, MD 20892, USA.
Epithelial cells secrete fibroblast growth factors (FGFs) into a microlumen, creating luminal signaling. This localized signaling coordinates cell differentiation and collective migration during organogenesis.
Area of Science:
- Developmental biology
- Cell signaling
Background:
- Fibroblast growth factors (FGFs) are crucial diffusible signals in organogenesis.
- FGFs regulate cell coordination, morphogenesis, and tissue architecture.
Purpose of the Study:
- To investigate the role of FGF localization in epithelial cell clusters.
- To understand how luminal signaling influences cell differentiation and migration.
Main Methods:
- The study by Durdu et al. (2014) analyzed FGF secretion and localization in epithelial cell clusters.
- Investigated the impact of restricted FGF distribution within a microlumen.
Main Results:
- Epithelial cell clusters secrete FGFs into an enclosed microlumen.
- Restricted FGF localization within the microlumen facilitates coordinated cell activities.
- Luminal signaling involving FGFs directs both cell differentiation and collective migration.
Conclusions:
- Luminal signaling is a key mechanism for coordinating cellular behavior during organogenesis.
- Localized FGF distribution provides spatial cues for tissue development.
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