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MAP-1B/TAU functional redundancy during laminin-enhanced axonal growth
M C DiTella1, F Feiguin, N Carri
1Instituto de Investigación Médica Mercedes y Martín Ferreyra, Córdoba, Argentina.
Journal of Cell Science
|February 1, 1996
Summary
Laminin accelerates axonal growth in neurons by promoting the use of microtubule-associated protein 1B (MAP-1b). This extracellular matrix molecule enhances axonal extension and microtubule stabilization, particularly when MAP-1b is utilized.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Neuronal development involves axonal elongation and microtubule dynamics.
- Microtubule-associated proteins (MAPs), including MAP-1b and tau, regulate microtubule stability.
- Extracellular matrix molecules like laminin influence neuronal growth and differentiation.
Purpose of the Study:
- To investigate the role of laminin in axonal elongation and neurite development.
- To determine the involvement of MAP-1b and tau in laminin-mediated axonal growth.
- To elucidate the mechanism by which laminin affects microtubule stabilization during axonal extension.
Main Methods:
- Cultured cerebellar macroneurons were grown on laminin-containing substrates or with added laminin.
- Neuronal development and axonal elongation rates were measured.
- Antisense oligonucleotides were used to suppress the expression of MAP-1b and tau.
- Immunoblotting and immunofluorescence were employed to detect phosphorylated MAP-1b incorporation into microtubules.
Main Results:
- Laminin significantly accelerated axonal elongation and induced axonal formation.
- Laminin promoted the incorporation of phosphorylated MAP-1b into axonal microtubules.
- Suppression of both MAP-1b and tau prevented laminin-induced axonal formation.
- Suppression of MAP-1b alone, but not tau, significantly reduced laminin-enhanced axonal elongation.
Conclusions:
- Laminin enhances axonal extension by promoting the utilization of MAP-1b.
- MAP-1b and tau exhibit functional substitution in axonal elongation.
- Extracellular matrix molecules like laminin play a crucial role in regulating microtubule dynamics and axonal growth through MAP-1b.