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TGF-beta is required for programmed cell death in interdigital webs of the developing mouse limb
Nicole Dünker1, Kai Schmitt, Kerstin Krieglstein
1Department of Anatomy and Cell Biology, Building 61, University of Saarland, D-66421, Homburg/Saar, Germany. nduenke@gwdg.de
Mechanisms of Development
|April 19, 2002
Summary
Transforming growth factor beta (TGF-β) is critical for programmed cell death (PCD) during limb development. Loss of TGF-β2 and TGF-β3 significantly reduces PCD, hindering digit formation and web regression.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Limb formation involves programmed cell death (PCD) in interdigital spaces.
- Transforming growth factor beta (TGF-β) superfamily members are implicated in cell-cell interactions and PCD regulation.
- TGF-β is suggested to mediate epithelial-mesenchymal interactions during development.
Purpose of the Study:
- To investigate the role of TGF-β2 and TGF-β3 in regulating PCD during limb development.
- To determine the effect of TGF-β2 and TGF-β3 deficiency on interdigital web regression.
Main Methods:
- Analysis of limb development in Tgfbeta2-/-Tgfbeta3-/- double knockout mice.
- Assessment of interdigital mesenchyme regression and PCD in mutant embryos.
- Examination of dose-dependent effects using Tgfbeta2-/-Tgfbeta3+/- mutants.
Main Results:
- Programmed cell death (PCD) was significantly reduced in the interdigital spaces of Tgfbeta2-/-Tgfbeta3-/- double knockout limbs.
- Interdigital web regression was dose-dependently affected by TGF-β2 and TGF-β3 levels.
- Tgfbeta2-/-Tgfbeta3+/- mutants showed partial reduction in interdigital mesenchyme, while double knockouts exhibited minimal regression.
Conclusions:
- TGF-β signaling is essential for regulating PCD during limb development.
- TGF-β2 and TGF-β3 play a critical role in the regression of interdigital webs.
- TGF-β acts as a crucial extrinsic regulator of programmed cell death in this context.