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Related Experiment Video

Updated: Sep 19, 2025

Establishment of a Surgically-induced Model in Mice to Investigate the Protective Role of Progranulin in Osteoarthritis

Establishment of a Surgically-induced Model in Mice to Investigate the Protective Role of Progranulin in Osteoarthritis

Published on: February 25, 2014

sPLA2-IIA modifies progranulin deficiency phenotypes in mouse models.

Cha Yang^1,2, Huan Du^1,2, Gwang Bin Lee³

¹Department of Molecular Biology and Genetics, 345 Weill Hall, Ithaca, NY, 14853, USA.

Molecular Neurodegeneration

|June 17, 2025

Summary

This summary is machine-generated.

Progranulin (PGRN) deficiency causes frontotemporal lobar degeneration (FTLD). A novel pathway involving sPLA2-IIA was identified, offering a better mouse model for FTLD-GRN research and potential therapeutic targets.

Keywords:

Inflammation Lysosome Mitochondria Mouse strain background Progranulin sPLA2-IIA

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Modified Yeast-Two-Hybrid System to Identify Proteins Interacting with the Growth Factor Progranulin

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Published on: January 17, 2012

Area of Science:

Neuroscience
Genetics
Molecular Biology

Background:

Progranulin (PGRN) haploinsufficiency is a primary genetic cause of frontotemporal lobar degeneration (FTLD).
Existing mouse models, particularly on the C57BL/6 background, exhibit mild PGRN deficiency phenotypes, limiting research into underlying pathways.
Understanding genetic background effects and regulatory pathways is crucial for developing effective FTLD models and therapies.

Purpose of the Study:

To investigate the impact of genetic background on progranulin deficiency phenotypes in mice.
To identify novel pathways that modulate PGRN deficiency-related phenotypes.
To establish a more robust mouse model for studying FTLD caused by PGRN mutations.

Main Methods:

Generated PGRN-deficient mice on both FVB/N and C57BL/6 backgrounds for comparative analysis.
Utilized immunostaining, western blot, RNA-sequencing, and proteomics to assess phenotypes and molecular changes.
Employed small molecule inhibitor treatment and adeno-associated virus (AAV)-mediated gene overexpression to explore pathway modulation.

Main Results:

PGRN deficiency in the FVB/N background led to more severe FTLD-related and lysosome-related phenotypes compared to C57BL/6.
Identified a novel interaction between PGRN and secreted phospholipase A2-IIA (sPLA2-IIA), which is upregulated in the FVB/N background.
sPLA2-IIA inhibition ameliorated PGRN deficiency phenotypes, while its overexpression exacerbated gliosis and lipofuscin accumulation.
Mitochondrial pathway dysregulation was observed in PGRN-deficient C57BL/6 mice but not in FVB/N mice.

Conclusions:

Established the FVB/N background as a superior model for studying FTLD-GRN due to enhanced phenotypic presentation.
Uncovered a novel pathway involving sPLA2-IIA that significantly modifies PGRN deficiency phenotypes.
These findings provide critical insights into FTLD pathogenesis and offer potential therapeutic targets.