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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Rab10 Phosphorylation Detection by LRRK2 Activity Using SDS-PAGE with a Phosphate-binding Tag
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La hinchazón lisosómica desencadena la actividad de LRRK2

Tuyana Malankhanova1,2, Zhiyong Liu3, Samuel Strader1,2

  • 1Duke Center for Neurodegeneration and Neurotherapeutics, Duke University, Durham, NC, USA.

bioRxiv : the preprint server for biology
|December 22, 2025
PubMed
Resumen

La hinchazón lisosómica, no el daño de la membrana, activa la quinasa 2 de repetición rica en leucina (LRRK2). Este descubrimiento revela a LRRK2 como un sensor del volumen lisosómico y el estrés mecánico, crucial para comprender las enfermedades relacionadas con LRRK2.

Palabras clave:
Biología de SistemasBiología CelularInmunologíaactivación de LRRK2Neurocienciainhibición de PIKfyvehinchazón lisosómicamacrófagos

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Área de la Ciencia:

  • Biología Celular
  • Biología Molecular
  • Bioquímica

Sus antecedentes:

  • Los desencadenantes precisos de la activación de la Leucina-Rich Repeat Kinase 2 (LRRK2) en condiciones fisiológicas siguen sin estar claros.
  • Se sabe que LRRK2 desempeña un papel en las funciones lisosómicas, pero las señales río arriba no se comprenden completamente.

Objetivo del estudio:

  • Identificar las señales fisiológicas que activan la Leucina-Rich Repeat Kinase 2 (LRRK2) endógena.
  • Investigar la relación entre la hinchazón lisosómica y la actividad de LRRK2.

Principales métodos:

  • Inducción de hinchazón lisosómica mediante inhibición de PIKfyve y captación de osmolitos indigestibles.
  • Medición de la fosforilación de Rab mediada por LRRK2.
  • Rescate farmacológico de desequilibrios iónicos lisosómicos.

Principales resultados:

  • La hinchazón lisosómica, independiente del daño de la membrana, desencadena selectivamente la fosforilación de Rab mediada por LRRK2.
  • La inhibición de PIKfyve induce la acumulación de fosforilación de Rab, que se suprime al rescatar la hinchazón lisosómica.
  • El estrés mecánico de la hinchazón aumenta la actividad de LRRK2 tanto en lisosomas hinchados como no hinchados.

Conclusiones:

  • La Leucina-Rich Repeat Kinase 2 (LRRK2) funciona como un sensor del volumen lisosómico y el estrés mecánico.
  • LRRK2 forma parte de un sistema de vigilancia endolisosómico que responde a la distensión lisosómica.
  • Estos hallazgos reestructuran el papel de LRRK2 en el contexto de la regulación del volumen lisosómico y la detección mecánica.