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La división celular B asimétrica en el centro de reacción del centro germinal
Burton E Barnett1, Maria L Ciocca, Radhika Goenka
1Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.
Science (New York, N.Y.)
|December 17, 2011
Resumen
Los linfocitos B del centro germinal se dividen asimétricamente, distribuyendo desigualmente las moléculas a las células hijas. Este proceso, crucial para las respuestas de anticuerpos, se basa en señales ambientales para la motilidad celular y la polaridad.
Área de la Ciencia:
- Inmunología Inmunología.
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La producción de anticuerpos de por vida depende de las reacciones del centro germinal dentro de los tejidos linfoides.
- Los linfocitos B exhiben polarización celular durante la estimulación del antígeno, un paso clave en la inmunidad humoral.
Objetivo del estudio:
- Para investigar el mecanismo de la división celular asimétrica en el centro germinal de los linfocitos B.
- Comprender cómo se establece la diversidad y la autorrenovación de las células hijas durante la reacción del centro germinal.
Principales métodos:
- Se estudió la segregación asimétrica de moléculas clave (Bcl6, IL-21R, aPKC) durante la división de los linfocitos B.
- Utilizó modelos de ratón con defectos en la adhesión de leucocitos para evaluar el papel de la motilidad en la división asimétrica.
Principales resultados:
- Los linfocitos B del centro germinal distribuyen asimétricamente el Bcl6, el receptor de la interleucina-21 y la proteína kinasa C. atípica.
- Los defectos en la adhesión de los leucocitos impiden la división asimétrica en los linfocitos B del centro germinal.
- Las células móviles pueden recibir señales de polaridad externa para la herencia desigual de células hijas.
Conclusiones:
- La división celular asimétrica en los linfocitos B del centro germinal genera diversidad de células hijas y auto-renovación.
- La adhesión de leucocitos y las señales microambientales son fundamentales para establecer la polaridad celular y la herencia desigual.
- Este mecanismo contribuye a las respuestas sostenidas de anticuerpos y la memoria inmunológica.
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