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Microarray Analysis Reveals Altered Lipid and Glucose Metabolism Genes in Differentiated, Ritonavir-Treated 3T3-L1
Cathriona R Loonam1, Sandra D O'Dell, Paul A Sharp
1Diabetes and Nutritional Sciences Division, King's College London, UK. cathriona.loonam@kcl.ac.uk.
Current HIV Research
|August 7, 2015
Summary
Ritonavir significantly alters adipocyte gene expression, impacting lipid accumulation and glucose metabolism. This suggests potential therapeutic targets for HIV lipodystrophy by modulating PPAR-γ signaling.
Area of Science:
- Molecular Biology
- Cell Biology
- Endocrinology
Background:
- HIV lipodystrophy involves abnormal fat distribution and metabolism due to altered adipocyte function.
- The protease inhibitor ritonavir is linked to the development of lipodystrophy.
- Understanding ritonavir's effects on adipogenic gene expression is crucial for identifying therapeutic strategies.
Purpose of the Study:
- To investigate the impact of ritonavir on gene expression in 3T3-L1 adipocytes.
- To identify specific genes and pathways affected by ritonavir treatment.
- To explore potential therapeutic targets for HIV lipodystrophy.
Main Methods:
- Gene expression profiling using Affymetrix Mouse Genome 430 2.0 oligonucleotide microarrays.
- Validation of key gene expression changes using real-time RT-PCR.
- Assessment of PPAR-γ transcriptional activity via DNA-binding ELISA.
- Quantification of adipocyte function through secreted adiponectin and triglyceride accumulation assays.
Main Results:
- Ritonavir significantly altered the expression of 389 genes (>5-fold change).
- Down-regulation of key adipogenic genes (e.g., Pparg, Cfd, Cidec) and glucose transport genes (e.g., Adipoq, Glut4).
- Up-regulation of Il6 and down-regulation of PPAR-γ regulatory genes (e.g., Cebpa, Nr1h3) were observed, alongside reduced PPAR-γ binding, adiponectin secretion, and triglyceride accumulation.
Conclusions:
- Ritonavir profoundly impacts adipocyte differentiation, lipid metabolism, and glucose regulation at the gene expression level.
- Down-regulation of Pparg appears to be influenced by alterations in Cebpa, Lcn2, and Nr1h3 expression.
- These findings highlight ritonavir-induced changes in adipocyte function and provide insights into potential therapeutic interventions for HIV lipodystrophy.
