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Related Experiment Videos

Programmed cell death in the terminal endbud.

R C Humphreys1

  • 1Laboratory of Genetics and Physiology, National Institute of Digestive, Diabetes and Kidney Disease, National Institutes of Health, Bethesda, Maryland 20892, USA. robinh@box-r.nih.gov

Journal of Mammary Gland Biology and Neoplasia
|July 30, 1999
PubMed
Summary

Mammary gland development involves programmed cell death (apoptosis) in mouse terminal endbuds. This apoptosis sculpts the ductal lumen, with Bcl-2 family proteins potentially regulating the process.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Pubertal mammary gland development involves significant epithelial remodeling.
  • Terminal endbuds (TEBs) are key structures driving ductal elongation.
  • Apoptosis has been observed in TEB body cells during development.

Purpose of the Study:

  • To investigate the role and regulation of apoptosis in pubertal mammary gland ductal development.
  • To determine if apoptosis contributes to lumen formation in the mammary duct.
  • To explore the involvement of Bcl-2 family proteins in TEB apoptosis.

Main Methods:

  • Histological analysis of mouse mammary glands during puberty.
  • Observation of apoptotic cell distribution within TEBs.

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  • Examination of Bcl-2 and Bcl-x expression patterns (implied).

    • Main Results:

    • Significant apoptosis occurs in the body cells of TEBs during pubertal development.
    • Apoptotic cells are sometimes localized to specific regions within TEBs.
    • The spatial distribution of apoptosis suggests a role in sculpting the ductal lumen.
    • Bcl-2 and Bcl-x proteins may play a role in regulating this apoptosis.

    Conclusions:

    • Apoptosis is a crucial mechanism for shaping the mammary ductal lumen during development.
    • The Bcl-2 family of proteins is implicated in the regulation of developmental apoptosis in TEBs.
    • Further investigation into signaling pathways regulating this process is warranted.