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Updated: May 9, 2026
07:12
Analysis of Fluorescent-Stained Lipid Droplets with 3D Reconstruction for Hepatic Steatosis Assessment
Published on: June 2, 2023
Tumour-driven lipid accumulation in oenocytes reflects systemic lipid alterations
Chang Liu1,2,3, Sofya Golenkina1,2, Natasha Fahey1,2
1Peter MacCallum Cancer Centre, Melbourne, Australia.
Plos Genetics
|May 7, 2026
Summary
In cancer cachexia, larval oenocytes accumulate lipids due to tumor signals. Despite metabolic changes, these cells do not preserve muscle function, indicating a complex lipid exchange system.
Area of Science:
- Cell Biology
- Metabolic Diseases
- Drosophila melanogaster research
Background:
- Cancer cachexia involves systemic metabolic dysfunction and liver steatosis.
- Oenocytes are hepatocyte-like cells in Drosophila larvae with a role in lipid metabolism.
- Tumor-secreted factors, such as Gbb and ImpL2, are implicated in cachexia progression.
Purpose of the Study:
- To investigate the function of larval oenocytes in a Drosophila model of cancer cachexia.
- To understand how oenocytes respond to tumor-secreted signals and systemic metabolic changes.
- To explore the role of oenocytes in lipid metabolism and their interaction with other tissues like the fat body and muscle.
Main Methods:
- Utilized a Drosophila model of cancer cachexia.
- Examined lipid droplet accumulation in oenocytes in response to tumor signals (Gbb, ImpL2).
- Manipulated lipid synthesis, breakdown, storage, and trafficking in fat body and muscle tissues.
- Performed oenocyte-specific gene knockdown (FASN1) and overexpression (Akt).
- Assessed PI3K signaling pathways in oenocytes.
Main Results:
- Tumor-bearing larvae showed increased lipid droplet accumulation in oenocytes, mediated by Gbb and ImpL2.
- Oenocyte lipid content was sensitive to manipulations in fat body and muscle lipid metabolism.
- Oenocyte-specific FASN1 knockdown affected lipid droplet size in the fat body, suggesting cross-tissue regulation.
- Cachectic oenocytes displayed reduced PI3K signaling; Akt overexpression normalized oenocyte size and lipid levels but not muscle integrity.
Conclusions:
- Oenocytes exhibit dynamic lipid exchange with the fat body and muscle during cancer cachexia.
- While oenocytes are metabolically responsive, they do not actively preserve muscle function in this model.
- The fat body and muscle lipid pools are critical for maintaining muscle integrity during cachexia.
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