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Zhang Q, Liu A, Abouelfetouh MM, Ma N, Li M, Chen S, Ding M, Ding Y. Let-7b-5p promotes electroacupuncture tolerance by downregulating Penk1 gene in CFA-induced inflammatory nociception rats. Gene 2020; 742:144583. [PMID: 32184167 DOI: 10.1016/j.gene.2020.144583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 03/09/2020] [Accepted: 03/11/2020] [Indexed: 11/26/2022]
Abstract
BACKGROUND Studies showed that increased let-7b-5p microRNA during repeated electroacupuncture (EA) treatment was associated the formation of EA tolerance, which manifested as gradually decreased nociceptive threshold. Proenkephalin (PENK) is the precursor of enkephalin which is a pivot neuropeptide responsible for the decreased nociceptive threshold in EA. The aim of this study was to evaluate the relationship between let-7b-5p and PENK in EA tolerance. METHODS The target gene of let-7b-5p microRNA was determined through the dual-luciferase reporter assay in cortical neurons. Seventy-two Sprague Dawley rats received a combination of EA and intracerebroventricular injection of microRNA (let-7b-5p agomir, antagomir or their controls). The nociceptive thresholds were assessed with radiant heat tail-flick method. PENK and let-7b-5p were measured with Western Blot and qPCR, respectively, after administration of let-7b-5p agomir, antagomir, and their controls at day 1, 4 and 7. RESULTS Let-7b-5p targeted the 3' untranslated region of Penk1. The nociceptive thresholds in Let-7b-5p agomir + EA group were decreased (p < 0.05) compared with those in Let-7b-5p antagomir + EA group at day 1 to 7. Compared with Let-7b-5p agomir + EA group, the expression level of PENK in Let-7b-5p antagomir + EA group was increased at days 1, 4, and 7 (p < 0.05) CONCLUSION: Let-7b-5p may be a new potential target for decreasing the EA tolerance effect and facilitating the application of EA in treating chronic nociception of patients.
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Affiliation(s)
- Qiulin Zhang
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China.
| | - Ai Liu
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China.
| | - Mahmoud M Abouelfetouh
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China.
| | - Ning Ma
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China
| | - Meng Li
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China
| | - Shuhuai Chen
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China
| | - Mingxing Ding
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China.
| | - Yi Ding
- College of Veterinary Medicine, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan, Hubei 430070, PR China.
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