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Engineering Three-dimensional Epithelial Tissues Embedded within Extracellular Matrix

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Dynamics of branched tissue assembly.

Sriram Manivannan, Celeste M Nelson

Stem Cell Research & Therapy

|November 2, 2012

Summary

Cellular tissue assembly is dynamic, especially in branching organs. Comparing fruit fly trachea and mouse mammary gland development reveals insights into stereotyped and non-stereotyped branching systems.

Area of Science:

Developmental biology
Cellular biology
Organogenesis

Background:

Tissue assembly is a complex, dynamic process crucial for organ formation.
Branching morphogenesis is a common developmental strategy in various organs.
Understanding tissue assembly dynamics is key to comprehending organ development and disease.

Purpose of the Study:

To investigate the dynamic nature of tissue assembly in branching systems.
To compare stereotyped and non-stereotyped branching development.
To identify common principles governing diverse organ development.

Main Methods:

Comparative analysis of two distinct branching systems: Drosophila melanogaster tracheal network and mouse mammary gland ducts.
Observation and characterization of branch extension and elongation processes.

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Utilizing established model organisms for developmental studies.

Main Results:

Tracheal network formation in Drosophila is a stereotyped process, yielding consistent organ geometry.
Mammary gland duct elongation in mice is non-stereotyped, resulting in unique individual patterns.
Both systems exhibit dynamic cellular behaviors during tissue assembly.

Conclusions:

Branching organ development involves dynamic cellular processes that can be either stereotyped or non-stereotyped.
Comparative studies of different branching systems enhance our understanding of developmental plasticity.
Insights gained can inform the study of human organ development, including lung, kidney, and salivary glands.