Abstract
Recent studies have demonstrated the vital role of P2X4 receptors (a family of ATP-gated non-selective cation channels) in the transmission of neuropathic and inflammatory pain. In this study, we investigated the role of spinal P2X4 receptors in chronic functional visceral hypersensitivity of neonatal maternal separation (NMS) rats. A rat model of irritable bowel syndrome was established by neonatal maternal separation. Visceral sensitivity was assessed by recording the response of the external oblique abdominal muscle to colorectal distension. P2X4 receptor antagonist and agonist were administrated intrathecally. The expression of P2X4 receptor was examined by Western Blot and immunofluorescence. The effect of P2X4 receptor antagonist on expression of brain-derived neurotrophic factor (BDNF) was assessed by Western Blot. We found neonatal maternal separation enhanced visceral hypersensitivity and increased the expression of P2X4 receptor in spinal thoracolumbar and lumbosacral segments of rats. Pharmacological results showed that visceral sensitivity was attenuated after intrathecal injection of P2X4 receptor antagonist, 5-BDBD, at doses of 10 nM or 100 nM, while visceral sensitivity was enhanced after intrathecal injection of P2X4 receptor agonist C5-TDS at doses of 10 μM or 15 μM. In addition, the spinal expression of BDNF significantly increased in NMS rats and intrathecal injection of 5-BDBD significantly decreased the expression of BDNF especially in NMS rats. C5-TDS failed to increase EMG amplitude in the presence of ANA-12 in control rats. Our results suggested the spinal P2X4 receptors played an important role in visceral hypersensitivity of NMS rats through BDNF.
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The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by grants from Fujian Science and Technology Innovation Joint Fund (2016Y9036, 2018Y9069), Natural Science Foundation of Fujian Province (2020J01608), Financial Special Fund of Fujian Province (2019B028), and Educational Research Projects for Young and Middle-aged Teachers of Fujian Provincial Education Department (JAT190172).
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CL and AC designed the study. BL, PS, ZC, YC, LC, and YT collected and analyzed the data. YH advised on histological staining and analysis. YT and LC drafted and wrote the manuscript. CL and AC revised the manuscript critically for intellectual content. All authors gave intellectual input to the study and approved the final version of the manuscript.
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All animal experiments were approved by the Animal Care and Use Committee, and the study protocol was approved by the Fujian Medical University. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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Tang, Y., Chen, L., Liu, B. et al. Spinal P2X4 Receptors Involved in Visceral Hypersensitivity of Neonatal Maternal Separation Rats. Purinergic Signalling 19, 113–122 (2023). https://doi.org/10.1007/s11302-022-09868-0
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DOI: https://doi.org/10.1007/s11302-022-09868-0