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Un ciclo de ácido tricarboxílico no canónico subyace a la identidad celular

Paige K Arnold^1,2, Benjamin T Jackson^1,2, Katrina I Paras^1,3

¹Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.

|March 10, 2022

Resumen

Las células de mamíferos utilizan un ciclo no canónico de ácido tricarboxílico (TCA) para los cambios de estado celular. Esta vía metabólica alternativa es crucial para procesos como la diferenciación de células madre embrionarias y la salida de la pluripotencia.

Área de la Ciencia:

El metabolismo celular
La bioquímica
Biología del desarrollo

Sus antecedentes:

El ciclo del ácido tricarboxílico (TCA) es vital para la energía celular y la biosíntesis.
Las células de mamíferos muestran una actividad diversa del ciclo TCA, pero los mecanismos y la importancia siguen sin estar claros.
La comprensión de la regulación del ciclo TCA es clave para comprender la determinación del destino celular.

Objetivo del estudio:

Identificar los mecanismos subyacentes a la diversidad del ciclo TCA en las células de los mamíferos.
Investigar el papel de la configuración del ciclo TCA en las transiciones del destino celular.
Explorar el requisito de un ciclo TCA no canónico para los cambios en el estado celular.

Principales métodos:

Mapeo de coesencialidad genética para identificar los genes que forman un ciclo alternativo de TCA.
Manipulación de la expresión de ATP citrato liasa y aconitasa 2 en mioblastos de ratón y células madre embrionarias.
Análisis de los cambios en la configuración del ciclo TCA durante las transiciones del destino celular, en particular la salida de la pluripotencia.

Principales resultados:

Se identificó un ciclo de TCA no canónico, utilizando ATP citrato liasa citoplasmática.
Esta vía no canónica es suficiente para eludir los pasos canónicos del ciclo TCA.
Las células madre embrionarias cambian de metabolismo canónico a no canónico de TCA durante la salida de pluripotencia; el bloqueo de este cambio evita la diferenciación.

Conclusiones:

Existe una alternativa al ciclo TCA no canónico y dependiente del contexto.
La activación adecuada del ciclo TCA es esencial para facilitar los cambios de estado celular.
El ciclo no canónico de TCA juega un papel crítico en la regulación de la salida de pluripotencia.

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