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Updated: Apr 6, 2026
Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
Published on: January 31, 2025
In vivo visualization of lipophagy dynamics using the tfLiveDrop reporter mice
Siqiao Gong1, Qiaofei Zhang1, Hongluan Wu1
1National Clinical Key Specialty Construction Program (2023), Guangdong Provincial Key Laboratory of Autophagy and Major Chronic Non-communicable Diseases, Key Laboratory of Prevention and Management of Chronic Kidney Disease of Zhanjiang City, Department of Nephrology, Institute of Nephrology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China.
Researchers developed the tfLiveDrop reporter mouse to visualize lipophagy (selective autophagy) in real-time. This tool reveals how lipophagy is dysregulated in diabetes and crucial for kidney development and lipid homeostasis.
Area of Science:
- Cell Biology
- Metabolic Research
- Autophagy
Background:
- Lipophagy is vital for cellular lipid homeostasis but challenging to study in vivo.
- Lack of sensitive tools hinders understanding of lipophagy's dynamic regulation and disease relevance.
Purpose of the Study:
- To develop and validate a novel reporter mouse model for real-time, in vivo visualization of lipophagic flux.
- To investigate the spatiotemporal regulation and physiological significance of lipophagy in different organs and disease models.
Main Methods:
- Generation of the tfLiveDrop reporter mouse using a tandem mCherry-eGFP fluorescent probe and a lipid droplet-targeting domain (LiveDrop).
- Validation in primary renal tubular epithelial cells (TECs).
- Systemic mapping of lipophagic activity in physiological and Type 2 diabetes models, and during kidney development.
Main Results:
- The tfLiveDrop reporter enables sensitive, real-time, single-cell resolution imaging of lipophagy in vivo.
- Basal lipophagic activity shows significant heterogeneity across organs.
- Lipophagic flux is dysregulated in a tissue-specific manner in a Type 2 diabetes model.
- A programmed wave of lipophagy is essential for lipid homeostasis during renal maturation.
Conclusions:
- The tfLiveDrop mouse is a powerful platform for in vivo lipophagy research.
- Lipophagy plays a critical role in metabolic disorders and organ development.
- This model facilitates deeper understanding of lipophagy's contribution to lipid metabolism and disease.
