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Growth factor modulation of substrate-specific morphological patterns in Aplysia bag cell neurons
1Department of Psychology, Yale University, New Haven, Connecticut 06511, USA.
Learning & Memory (Cold Spring Harbor, N.Y.)
|September 24, 1999
Summary
Extracellular matrix (ECM) components and growth factors (GFs) influence neuronal structure. This study shows how Aplysia bag cell neurons (BCNs) interact with ECM and GFs, revealing substrate-specific responses crucial for neuronal plasticity.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Extracellular matrix (ECM) components serve as substrates for neuronal attachment and signal transduction.
- Growth factors (GFs) are vital for neuronal development and plasticity.
- Understanding ECM-neuron and GF-neuron interactions is key to deciphering neuronal structural changes.
Purpose of the Study:
- To investigate the interaction of Aplysia bag cell neurons (BCNs) with various ECM components and GFs.
- To determine how different ECM substrates modulate BCN morphology and neurite outgrowth.
- To elucidate the substrate-dependent effects of GFs on BCNs.
Main Methods:
- Cultured Aplysia bag cell neurons (BCNs) were grown on different ECM substrata (collagen, poly-L-lysine, laminin, fibronectin).
- BCNs were treated with specific growth factors: BDNF, CNTF, and NGF.
- Adhesion and outgrowth were assessed using anti-beta1-integrin antibodies and RGD peptides.
Main Results:
- ECM substrata differentially affected BCN morphology and neurite outgrowth; collagen and poly-L-lysine promoted larger soma diameter and more outgrowth than laminin and fibronectin.
- Growth factor treatments yielded substrate-specific outcomes: BDNF enhanced outgrowth on fibronectin/laminin but reduced it on poly-L-lysine.
- CNTF altered soma diameter depending on the substrate, while NGF reduced both soma diameter and outgrowth universally.
- Anti-beta1-integrin and RGD peptides indicated distinct adhesion mechanisms (beta1-integrin and RGD-dependent) involved in BCN interactions with ECM.
Conclusions:
- BCN morphology and outgrowth are significantly influenced by the specific extracellular matrix (ECM) substrate.
- Growth factors (GFs) exert differential effects on BCNs depending on the ECM composition, highlighting complex signaling pathways.
- Neurons utilize distinct beta1-integrin and RGD-dependent adhesion mechanisms for interacting with various ECM components, offering potential targets for modulating neuronal plasticity.