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• W3201865440 abstract "Angina pectoris is cardiac pain that is a common clinical symptom often resulting from myocardial ischemia. Spinal cord stimulation (SCS) is effective in treating refractory angina pectoris, but its underlying mechanisms have not been fully elucidated. The spinal dorsal horn is the first region of the central nervous system that receives nociceptive information; it is also the target of SCS. In the spinal cord, glial (astrocytes and microglia) activation is involved in the initiation and persistence of chronic pain. Thus, the present study investigated the possible cardiac pain‑relieving effects of SCS on spinal dorsal horn glia in chronic myocardial ischemia (CMI). CMI was established by left anterior descending artery ligation surgery, which induced significant spontaneous/ongoing cardiac pain behaviors, as measured using the open field test in rats. SCS effectively improved such behaviors as shown by open field and conditioned place preference tests in CMI model rats. SCS suppressed CMI‑induced spinal dorsal horn microglial activation, with downregulation of ionized calcium‑binding adaptor protein‑1 expression. Moreover, SCS inhibited CMI‑induced spinal expression of phosphorylated‑p38 MAPK, which was specifically colocalized with the spinal dorsal horn microglia rather than astrocytes and neurons. Furthermore, SCS could depress spinal neuroinflammation by suppressing CMI‑induced IL‑1β and TNF‑α release. Intrathecal administration of minocycline, a microglial inhibitor, alleviated the cardiac pain behaviors in CMI model rats. In addition, the injection of fractalkine (microglia‑activating factor) partially reversed the SCS‑produced analgesic effects on CMI‑induced cardiac pain. These results indicated that the therapeutic mechanism of SCS on CMI may occur partially through the inhibition of spinal microglial p38 MAPK pathway activation. The present study identified a novel mechanism underlying the SCS‑produced analgesic effects on chronic cardiac pain." @default.
• W3201865440 created "2021-10-11" @default.
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• W3201865440 date "2021-10-01" @default.
• W3201865440 modified "2023-09-27" @default.
• W3201865440 title "Spinal cord stimulation reduces cardiac pain through microglial deactivation in rats with chronic myocardial ischemia" @default.
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• W3201865440 doi "https://doi.org/10.3892/mmr.2021.12475" @default.
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