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Factores de crecimiento de las células de Schwann.
Cell
|November 1, 1978
Resumen
Los extractos de la pituitaria y el cerebro bovinos estimulan significativamente la proliferación de células de Schwann en ratas, independientemente de los niveles cíclicos de AMP. Esto sugiere que al menos dos vías distintas regulan la división celular de Schwann.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las células de Schwann son cruciales para la función nerviosa periférica.
- Comprender la proliferación de las células de Schwann es clave para la investigación de la regeneración nerviosa.
- Los factores de crecimiento existentes no explican completamente la mitogénesis de las células de Schwann.
Objetivo del estudio:
- Identificar los factores que promueven la proliferación de las células de Schwann.
- Investigar los mecanismos subyacentes a la estimulación del crecimiento celular de Schwann.
- Para explorar posibles efectos sinérgicos con mitógenos conocidos.
Principales métodos:
- Cultivo de células Schwann purificadas de la rata.
- Prueba de extractos de tejido bovino crudo (hipófisis, cerebro, raíces nerviosas, hígado, riñón) para la actividad mitogénica.
- Evaluación del efecto del suero fetal de ternera (FCS, por sus siglas en inglés) y varias hormonas.
- Investigando el papel de la AMP cíclica (cAMP) y la toxina del cólera.
Principales resultados:
- Los extractos crudos de la hipófisis y el cerebro mejoraron notablemente la proliferación celular de Schwann.
- Los extractos de la hipófisis eran mitógenos más potentes que los extractos del cerebro.
- Ni los extractos pituitarios ni los cerebrales aumentaron los niveles de AMPc, pero sinergizaron con la toxina del cólera.
- El FCS era necesario pero insuficiente por sí solo para una proliferación óptima.
Conclusiones:
- La hipófisis y el cerebro bovinos contienen potentes mitógenos térmicamente sensibles para las células de Schwann.
- Al menos dos vías de señalización distintas estimulan la división celular de Schwann.
- Una vía implica un aumento de la cAMP intracelular, mientras que otra no lo hace.
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