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Telmisartan Protects a Microglia Cell Line from LPS Injury Beyond AT1 Receptor Blockade or PPARγ Activation.
Abdel G Elkahloun1, Yara Rodriguez2, Seham Alaiyed2
1Microarray Core, Cancer Genetics and Comparative Genomics Branch, National Human Genome Research Institute, National Institutes of Health, 50 South Dr, MSC 4435, Bethesda, MD, 20892-4435, USA.
Molecular Neurobiology
|August 15, 2018
Summary
Telmisartan demonstrates novel neuroprotective effects in microglia by downregulating inflammatory genes, independent of its known mechanisms. This suggests potential new therapeutic avenues for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Pharmacology
- Immunology
Background:
- Telmisartan, an Angiotensin II Receptor Blocker (ARB), is known to reduce inflammation via AT1 receptor blockade and PPARγ activation.
- Microglia play a crucial role in neuroinflammation, and their responses can be mimicked in cell lines like BV2.
- Understanding Telmisartan's effects beyond its known pathways is vital for exploring new therapeutic applications.
Purpose of the Study:
- To investigate the novel neuroprotective mechanisms of Telmisartan in a mouse microglia-like BV2 cell line.
- To explore Telmisartan's effects on gene expression related to inflammation, apoptosis, and neurodegeneration, independent of AT1 receptor and PPARγ pathways.
- To evaluate the neuroprotective potential of PPARγ antagonists and their interaction with Telmisartan.
Main Methods:
- Utilized a mouse microglia-like BV2 cell line, lacking AT1 receptor gene expression and PPARγ activation.
- Performed global gene expression profiling and pathway analysis to assess changes induced by Telmisartan and other agents.
- Employed Gene Set Enrichment Analysis (GSEA) to correlate gene expression changes with specific biological processes and disorders.
Main Results:
- Telmisartan reduced pro-injury gene expression and enhanced anti-inflammatory genes in BV2 cells, independent of AT1 receptor or PPARγ activation.
- Telmisartan normalized numerous LPS-upregulated genes linked to inflammation, apoptosis, and neurodegeneration.
- PPARγ antagonists (GW9662, T0070907) exhibited neuroprotective effects and potentiated Telmisartan's actions, notably through TLR2 signaling pathway downregulation.
Conclusions:
- Telmisartan possesses novel neuroprotective effects in microglia, involving the downregulation of the TLR2 signaling pathway.
- These findings suggest Telmisartan's potential therapeutic relevance for neurodegenerative diseases, extending beyond its established mechanisms.
- PPARγ antagonists may offer synergistic neuroprotection with Telmisartan by modulating inflammatory pathways.
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