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Disorders of Erythrocytes
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El erizo sónico morfogénico es un quimioatractor axonal que colabora con la netrina-1 en la guía del axón de la línea
Frédéric Charron1, Elke Stein, Juhee Jeong
1Department of Biological Sciences, Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.
Cell
|April 8, 2003
Resumen
Sonic hedgehog (Shh) actúa como un quimioatractor, guiando a los axones en desarrollo hacia sus objetivos. Este morfógeno utiliza la señalización suavizada (Smo), revelando un nuevo papel para los morfógenos en la orientación axonal.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología del desarrollo Biología del desarrollo.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La orientación de los axones es crucial para la formación de circuitos neuronales.
- Netrin-1 es un conocido quimioatractor para los axones comisurales.
- La placa del piso proporciona señales de guía adicionales más allá de Netrin-1.
Objetivo del estudio:
- Para investigar el papel de Sonic hedgehog (Shh) como un quimioatractor axonal.
- Para determinar si Shh contribuye a la actividad de orientación de la placa del suelo.
- Para aclarar la vía de señalización involucrada en la orientación del axón mediada por Shh.
Principales métodos:
- Ensayos de quimioatracción in vitro utilizando axones aislados.
- La inhibición de la señalización Shh a través de ciclopamina dirigida a Smoothened (Smo).
- La inactivación condicional de Smo en las neuronas comisurales in vivo.
Principales resultados:
- Sonic hedgehog (Shh) demostró actividad quimioatractiva en axones aislados.
- Shh imitó la actividad quimioatractiva adicional de la placa del suelo in vitro.
- Inhibición o inactivación de la quimioatracción mediada por Shh y la proyección normal del axón.
Conclusiones:
- Shh actúa como un quimioatractor derivado de la línea media para los axones comisurales a través de la señalización Smo.
- Los morfógenos como Shh pueden funcionar como quimioatractores axonales directos.
- Esto identifica un nuevo mecanismo para la orientación de axones durante el desarrollo embrionario.
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