Progranulin associates with Rab2 and is involved in autophagosome-lysosome fusion in Gaucher disease.

Xiangli Zhao, Rossella Liberti, Jinlong Jian, Wenyu Fu, Aubryanna Hettinghouse, Ying Sun, Chuan-Ju Liu

Journal of molecular medicine (Berlin, Germany) 2021 Nov

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Progranulin (PGRN) is a key regulator of lysosomes, and its deficiency has been linked to various lysosomal storage diseases (LSDs), including Gaucher disease (GD), one of the most common LSD. Here, we report that PGRN plays a previously unrecognized role in autophagy within the context of GD. PGRN deficiency is associated with the accumulation of LC3-II and p62 in autophagosomes of GD animal model and patient fibroblasts, resulting from the impaired fusion of autophagosomes and lysosomes. PGRN physically interacted with Rab2, a critical molecule in autophagosome-lysosome fusion. Additionally, a fragment of PGRN containing the Grn E domain was required and sufficient for binding to Rab2. Furthermore, this fragment significantly ameliorated PGRN deficiency-associated impairment of autophagosome-lysosome fusion and autophagic flux. These findings not only demonstrate that PGRN is a crucial mediator of autophagosome-lysosome fusion but also provide new evidence indicating PGRN's candidacy as a molecular target for modulating autophagy in GD and other LSDs in general. KEY MESSAGES : PGRN acts as a crucial factor involved in autophagosome-lysosome fusion in GD. PGRN physically interacts with Rab2, a molecule in autophagosome-lysosome fusion. A 15-kDa C-terminal fragment of PGRN is required and sufficient for binding to Rab2. This PGRN derivative ameliorates PGRN deficiency-associated impairment of autophagy. This study provides new insights into autophagy and may develop novel therapy for GD. © 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Citation

Xiangli Zhao, Rossella Liberti, Jinlong Jian, Wenyu Fu, Aubryanna Hettinghouse, Ying Sun, Chuan-Ju Liu. Progranulin associates with Rab2 and is involved in autophagosome-lysosome fusion in Gaucher disease. Journal of molecular medicine (Berlin, Germany). 2021 Nov;99(11):1639-1654