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Reduction of endogenous transforming growth factors beta prevents ontogenetic neuron death
K Krieglstein1, S Richter, L Farkas
1Department of Anatomy, Medical Faculty, University of Saarland at Homburg/Saar, Building 61, D-66421 Homburg/Saar, Germany. ankkri@med-rz.uni-sb.de
Abstract:
We show that following immunoneutralization of endogenous transforming growth factors beta (TGF-beta) in the chick embryo, ontogenetic neuron death of ciliary, dorsal root and spinal motor neurons was largely prevented, and neuron losses following limb bud ablation were greatly reduced. Likewise, preventing TGF-beta signaling by treatment with a TbetaR-II fusion protein during the period of ontogenetic cell death in the ciliary ganglion rescued all neurons that normally die. TUNEL staining revealed decreased numbers of apoptotic cells following antibody treatment. Exogenous TGF-beta rescued the TGF-beta-deprived phenotype. We conclude that TGF-beta is critical in regulating ontogenetic neuron death as well as cell death following neuronal target deprivation.
Insights
Transforming growth factor-beta (TGF-beta) is critical for natural neuron death during development and after injury. Blocking TGF-beta signaling prevents neuron loss, highlighting its role in regulating cell survival.
Area of Science:
- Developmental Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Ontogenetic neuron death is a crucial process for nervous system development.
- Transforming growth factor-beta (TGF-beta) is implicated in various cellular processes, including cell death.
- The precise role of TGF-beta in developmental neuron survival and target-deprivation-induced cell death requires further elucidation.
Purpose of the Study:
- To investigate the role of endogenous transforming growth factor-beta (TGF-beta) in regulating ontogenetic neuron death in the chick embryo.
- To determine if TGF-beta signaling is involved in cell death following neuronal target deprivation (limb bud ablation).
- To assess the effects of blocking TGF-beta signaling on neuron survival in the ciliary ganglion.
Main Methods:
- Immunoneutralization of endogenous TGF-beta using antibodies in chick embryos.
- Treatment with a TGF-beta receptor II (TbetaR-II) fusion protein to block TGF-beta signaling.
- Limb bud ablation to induce neuronal target deprivation.
- TUNEL staining to detect apoptotic cells.
- Administration of exogenous TGF-beta to rescue phenotypes.
Main Results:
- Immunoneutralization of TGF-beta largely prevented ontogenetic neuron death in ciliary, dorsal root, and spinal motor neurons.
- Neuron loss following limb bud ablation was significantly reduced when TGF-beta was neutralized.
- Blocking TGF-beta signaling with a TbetaR-II fusion protein rescued all neurons that normally undergo cell death in the ciliary ganglion.
- TUNEL staining indicated fewer apoptotic cells in TGF-beta-treated embryos.
- Exogenous TGF-beta administration reversed the effects of TGF-beta deprivation.
Conclusions:
- Transforming growth factor-beta (TGF-beta) plays a critical role in regulating ontogenetic neuron death during development.
- TGF-beta signaling is essential for mediating cell death following neuronal target deprivation.
- Targeting TGF-beta signaling represents a potential therapeutic strategy for conditions involving excessive neuron loss.