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Peripheral ASIC1a regulation in an LPS-induced inflammatory pain model
Mayra Micaela Montes1, Libia Catalina Salinas Castellanos1, Juan Santiago Guidobono2
1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), Buenos Aires, Argentina.
Neuropharmacology
|July 27, 2026
Summary
Lipopolysaccharide (LPS) induces inflammatory pain by upregulating acid-sensing ion channel 1a (ASIC1a) in inflamed paw tissue. Blocking ASIC1a with PcTx-1 reduces pain hypersensitivity, highlighting its therapeutic potential.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Inflammatory pain models often use irritants like lipopolysaccharide (LPS).
- Acid-sensing ion channels (ASICs) are implicated in pain, but their peripheral regulation is unclear.
- Previous work showed formalin pain increases ASIC1a in the nervous system.
Purpose of the Study:
- Investigate ASIC1a regulation in LPS-induced inflammatory pain.
- Determine ASIC1a's role in peripheral tissue during inflammation.
- Explore therapeutic targeting of ASIC1a.
Main Methods:
- Utilized the LPS hind paw injection model in mice.
- Analyzed ASIC1a expression in paw tissue and dorsal root ganglia (DRGs).
- Assessed behavioral hypersensitivity and employed pharmacological blockade with PcTx-1.
Main Results:
- Demonstrated robust ASIC1a upregulation in inflamed paw tissue and DRGs.
- Linked ASIC1a upregulation to paw edema, ERK activation, and miRNA regulation.
- Showed PcTx-1 blockade attenuated mechanical and thermal hypersensitivity.
Conclusions:
- Inflamed peripheral tissue is a key site for ASIC1a regulation in LPS-induced pain.
- ASIC1a plays a significant role in the development of inflammatory hypersensitivity.
- ASIC1a represents a promising therapeutic target for inflammatory pain.
