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Cellular Injury V: Apoptosis and Autophagy01:22

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Programmed cell death (apoptosis) is essential for embryonic development, including limb patterning.
  • The roles of specific enzymes in regulating apoptosis during limb development are not fully understood.

Purpose of the Study:

  • To investigate the role of cathepsin enzymes (D, B, and L) in embryonic limb interdigital apoptosis.
  • To elucidate the regulatory mechanisms controlling cathepsin gene expression during apoptosis.
  • To explore the functional relationship between cathepsins and caspases in programmed cell death.

Main Methods:

  • Analysis of cathepsin gene expression patterns during chick and duck limb development.
  • Examination of gene expression in Gremlin-/- and Dkk-/- mouse mutants.
  • Local application of BMP proteins to embryonic tissues.
  • Overexpression studies of cathepsin D in embryonic tissues.
  • Combined inhibition of cathepsins and caspases.

Main Results:

  • Cathepsin D and B gene expression patterns correlate with interdigital apoptosis in chick and duck limbs.
  • BMP signaling regulates cathepsin B and D gene expression, indicating a role in triggering cell death.
  • Cathepsin D protein is upregulated in preapoptotic mesenchyme and induces cell death via mitochondrial pathways.
  • Inhibition of both cathepsins and caspases reveals functional redundancy and compensatory activation within the apoptotic machinery.

Conclusions:

  • Lysosomal enzymes, particularly cathepsin D and B, are functionally involved in embryonic programmed cell death.
  • BMP signaling plays a key role in regulating cathepsin-mediated apoptosis during limb development.
  • Cathepsin pathways offer compensatory mechanisms for apoptosis when caspases are inhibited, highlighting enzyme redundancy in cell death processes.