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C8H7NO4, orthorhombic, Pccn (no. 56), a = 14.1361(10) Å, b = 15.8923(12) Å, c = 6.6410(6) Å, V = 1491.9(2) Å3, Z = 8, Rgt(F) = 0.0406, wRref(F2) = 0.1155, T = 150(2) K.

Repetitive transcranial magnetic stimulation (rTMS) could effectively relieve the pain and depression in neuropathic pain (NP) patients. However, the specific treatment parameters and exact mechanism are still unclear. Our purpose is to observe the effects of rTMS on pain and despair‐like behaviour in chronic constriction injury (CCI) rats and explore its possible mechanism. Thirty‐two 8‐week‐old male Sprague–Dawley rats were randomly divided into four groups: sham operation group (S, n = 8), CCI group (n = 8), 1 Hz‐rTMS group (n = 8) and 10 Hz‐rTMS group (n = 8). The rTMS was applied to the left dorsal anterior agranular insular (AId) 1 week after the operation, once a day, 5 days/week for 4 consecutive weeks. Mechanical hyperalgesia, despair‐like behaviours and sciatic nerve function were used to evaluate the effects of rTMS. Besides, glucose metabolism, the metabotropic glutamate receptors 5 (mGluR5), N‐Methyl‐D‐Aspartic acid receptor type 2B (NMDAR2B), tumour necrosis factor‐α (TNF‐α), interleukin‐6 (Ll‐6) and interleukin‐1β (Ll‐1β) in AId were tested to explore the possible mechanism. Compared with 1 Hz‐rTMS, the rats of 10 Hz‐rTMS had higher the mechanical hyperalgesia, higher sugar preference and shorter swimming immobility time. Besides, the expressions of mGluR5, NMDAR2B, TNF‐α, Ll‐1β and Ll‐6 both in 1 Hz‐rTMS and 10 Hz‐rTMS groups were reduced compared with the CCI group; the 10 Hz‐rTMS group had a more decrease than that of 1 Hz‐rTMS. Furthermore, the [18]F‐FDG uptake was lower than that in the 1 Hz‐rTMS group. Compared with 1 Hz‐rTMS, 10 Hz‐rTMS could more effectively relieve mechanical hyperalgesia and reverse despair‐like behaviour in rats. The mechanism could be related to regulating mGluR5/NMDAR2B‐related inflammatory signalling pathways in the AId. [ABSTRACT FROM AUTHOR]

C8H7NO4, orthorhombic, Pccn (no. 56), a = 14.1361(10) Å, b = 15.8923(12) Å, c = 6.6410(6) Å, V = 1491.9(2) Å3, Z = 8, Rgt(F) = 0.0406, wRref(F2) = 0.1155, T = 150(2) K. [ABSTRACT FROM AUTHOR]

C8H7NO4, orthorhombic, Pccn (no. 56), a = 14.1361(10) Å, b = 15.8923(12) Å, c = 6.6410(6) Å, V = 1491.9(2) Å3, Z = 8, Rgt(F) = 0.0406, wRref(F2) = 0.1155, T = 150(2) K. [ABSTRACT FROM AUTHOR]

The effect of high-frequency (HF) repetitive transcranial magnetic stimulation (rTMS) on the dorsolateral prefrontal cortex (DLPFC) can relieve chronic pain and accompanying depressive symptoms. However, in recent years, some high-quality studies have challenged this view. Therefore, it is necessary to update the data and analyze the effects of HF rTMS on the DLPFC on chronic pain and accompanying depression. We performed a systematic review and meta-analysis to evaluate the effect of HF rTMS on the DLPFC on chronic pain and accompanying depression. We searched PubMed, Medline, Web of Science, and Cochrane through September 2021. The search strings searched were : "pain" AND ("TMS" OR "transcranial magnetic stimulation") AND "prefrontal cortex". The inclusion criteria according to PICOS was as follows: P, patient with chronic pain; I, HF (≥5 Hz) rTMS on the DLPFC; C, included a sham treatment condition; O, pain indicators; S, pre-/poststudies, crossover, or parallel-group. We extracted the pain and accompanying depression evaluation indicators. The short-term analgesic effect of HF rTMS over the left DLPFC is not significant (WMD = 0.34, 95% CI: [-1.60, 2.28]) but has a significant mid-term and long-term analgesic effect on chronic pain (WMD = -0.50, 95% CI: [-0.99, -0.01]; WMD = -1.10, 95% CI: [-2.00, -0.19], respectively). HF rTMS over the DLPFC can effectively alleviate the depressive symptoms of patients with chronic pain (WMD = -0.83, 95% CI: [-3.01, 1.36]). Thus, HF rTMS on the left DLPFC can relieve chronic pain and accompanying depressive symptoms.