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Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
Published on: June 3, 2016
Control cíclico mediado por AMP de la síntesis de la enzima lipogénica durante la diferenciación adiposa de las
Cell
|May 1, 1981
Resumen
Los agentes que aumentan el monofosfato cíclico de adenosina (cAMP) reducen la síntesis de enzimas lipogénicas clave durante la diferenciación de las células grasas. Esta reducción se produce a nivel del ARN mensajero (ARNm), independientemente de la lipólisis.
Área de la Ciencia:
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
- Biología molecular La biología molecular.
Sus antecedentes:
- La diferenciación de la adiposa implica una mayor síntesis de enzimas lipogénicas.
- Los agentes que aumentan el monofosfato cíclico de adenosina (cAMP) generalmente inducen la lipólisis en las células grasas.
Objetivo del estudio:
- Investigar el efecto de los agentes elevadores de cAMP en la síntesis de enzimas lipogénicas durante la diferenciación celular 3T3-F442A.
- Para determinar si los efectos de la cAMP están mediados por la lipólisis o los niveles de ARNm.
Principales métodos:
- Tratamiento de las células 3T3-F442A con agentes elevadores de cAMP (Dibutirilo cAMP, teofilina, isoproterenol).
- Medición de la síntesis de las enzimas lipogénicas (glicerofosfato deshidrogenasa, sintetasa de ácidos grasos, enzima málica).
- Ensayos de traducción in vitro utilizando ARNm aislado de las células tratadas.
Principales resultados:
- Los agentes elevadores de cAMP redujeron la síntesis de enzimas lipogénicas, siendo la sintetasa de ácidos grasos la más sensible.
- Estos agentes no afectaron los cambios morfológicos o la síntesis de otras proteínas.
- La reducción en la síntesis enzimática fue independiente de la acumulación de triglicéridos (lipólisis).
- Los niveles de ARNm para las enzimas lipogénicas se redujeron en las células tratadas con agentes elevadores de cAMP.
Conclusiones:
- El monofosfato cíclico de adenosina (cAMP) reduce específicamente la acumulación de ARN mensajero (ARNm) para las enzimas lipogénicas durante la diferenciación adiposa.
- cAMP tiene una doble función: activar la lipólisis e inhibir la síntesis de la enzima lipogénica a través de la regulación del ARNm.
- Los cambios morfológicos y la síntesis de enzimas durante la adipogénesis se controlan de forma independiente.
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