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Updated: Nov 21, 2025

Mouse Mammary Epithelial Cells form Mammospheres During Lactogenic Differentiation
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Insulin regulates human mammosphere development and function.

Ashalyn P Watt1, Christophe Lefevre2,3, Cynthia S Wong4

  • 1Institute for Frontier Materials, Deakin University, Geelong, 3216, Australia. ashalyn.watt@monash.edu.

Cell and Tissue Research
|January 13, 2021
PubMed
Summary
This summary is machine-generated.

Insulin is crucial for human mammary gland development, forming functional mammospheres essential for lactation. This finding has implications for understanding lactational efficiency in conditions like obesity and gestational diabetes.

Keywords:
DifferentiationExtracellular matrixInsulinMammary glandMammosphere

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Area of Science:

  • * Human mammary gland development and function.
  • * Endocrinology and cell signaling.
  • * In vitro modeling for reproductive biology.

Background:

  • * Limited access to human mammary tissue hinders research on lactogenic hormones.
  • * Development of a functional in vitro model is needed to study mammary gland development.
  • * Understanding hormonal regulation is key for reproductive health.

Purpose of the Study:

  • * To characterize a human in vitro three-dimensional mammosphere model.
  • * To assess the role of insulin and IGF-1 in mammary epithelial cell development.
  • * To investigate signaling pathways regulating mammary gland development.

Main Methods:

  • * Culturing human mammary epithelial cells in vitro to form mammospheres on different matrices.
  • * Utilizing microarray analysis to study gene expression changes.
  • * Comparing the effects of insulin and insulin-like growth factor 1 (IGF-1).

Main Results:

  • * Insulin is essential for mammosphere formation and up-regulates extracellular matrix genes.
  • * Mammosphere formation involves up-regulation of differentiation, cell-cell junctions, and cytoskeleton organization.
  • * IGF-1 induced spherical structures but failed to induce proper cell polarization and milk protein gene expression.

Conclusions:

  • * Insulin plays a significant role in mammary acinar development, secretory differentiation, and function.
  • * The mammosphere model provides insights into hormonal regulation of mammary gland development.
  • * Findings suggest potential implications for reduced lactational efficiency in women with obesity and gestational diabetes.