Expression of Piezo mRNA is unaffected in a rat model of knee osteoarthritis

• Published in: Molecular pain Vol. 17; p. 17448069211014059
• Main Authors: Ikeda, Ryo, Arimura, Daigo, Saito, Mitsuru
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 2021; Sage Publications Ltd
• Subjects: Activities of daily living; Arthralgia; Arthritis; Cartilage (articular); Cartilage diseases; Dorsal root ganglia; Gene expression; Hyperalgesia; Inflammation; Joint diseases; Knee; Mechanical stimuli; Micro Report; mRNA; Osteoarthritis; Pain; Pain perception; knee; Piezo; pain; mechanical allodynia; hyperalgesia; Osteoarthritis
• ISSN: 1744-8069; 1744-8069
• DOI: 10.1177/17448069211014059

Osteoarthritis of the knee impairs activities of daily living of those affected. Its irreversible degenerative changes to the knee joint induce functional disturbance and unpleasant arthralgia. The pain has inflammatory components and often is manifested with mechanical allodynia and hyperalgesia. Sustained weight bearing and joint movements increase pain sensitivity in knee osteoarthritis. Understanding the mechanisms underlying the mechanical allodynia and hyperalgesia might provide a therapeutical target for pain relief in patients with such symptoms. Piezo channel is a mechanically activated ion channel that may be involved in mechanical transduction in the articular cartilage. Although it has been shown that inflammation potentiates Piezo channel current induced by mechanical stimulation, whether Piezo expression levels are influenced by knee osteoarthritis has remained unknown. We measured Piezo mRNA in knee joints and dorsal root ganglia after establishing a model of knee osteoarthritis in rats using monosodium iodoacetate and found Piezo mRNA level is not upregulated. This finding raises a question as whether and how Piezo channels may be involved in mechanically induced pain in osteoarthritis.