Articles: neuralgia.
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Neurotoxicity research · Jun 2020
Behavioral, Electrophysiological, and Histological Characterization of a New Rat Model for Neoadjuvant Chemotherapy-Induced Neuropathic Pain: Therapeutic Potential of Duloxetine and Allopregnanolone Concomitant Treatment.
Neoadjuvant chemotherapy is beneficial against breast cancer, but its toxicity causes painful chemotherapy-induced neuropathy which decreases seriously patients' quality of life. Development of effective therapy is crucial because current treatments are unsatisfactory. While animal models have previously been produced to test therapeutics against chemotherapy-induced neuropathy, neuropathic pain evoked by the frequently used neoadjuvant-chemotherapy involving sequentially epirubicin and docetaxel has never been modeled. ⋯ This concomitant therapy was more effective than separate duloxetine or allopregnanolone treatment to prevent epirubicin-docetaxel induced cold allodynia, mechanical allodynia/hyperalgesia, peripheral nerve functional/electrophysiological, and histological alterations. Interestingly, duloxetine-allopregnanolone concomitant treatment (but not duloxetine) also prevented epirubicin-docetaxel induced Schwann cell dedifferentiation and related macrophage (CD11b/c-positive cells) infiltration in sciatic nerves. Altogether, our results suggest that duloxetine and allopregnanolone concomitant treatment may represent a promising therapeutic option to counteract efficiently painful neuropathy or epirubicin-docetaxel evoked peripheral nerve tissue damages and dysfunctions.
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Observational Study
Comparison of ropivacaine with ropivacaine and fentanyl in continuous epidural analgesia for postherpetic neuralgia: A STROBE-compliant retrospective study.
Continuous epidural analgesia (CEA) using local anesthetics is frequently used to control herpes zoster pain and prevent postherpetic neuralgia (PHN). However, few studies have been conducted to determine the efficacy of epidural drugs administered as CEA to manage PHN. This retrospective study was designed to evaluate the effectiveness of CEA with ropivacaine alone or with ropivacaine and fentanyl for controlling pain caused by PHN. ⋯ There was no difference in the management of pain in patients with PHN between the groups. Epidural administration of fentanyl with ropivacaine did not improve pain management when compared to ropivacaine alone. Although not statistically significant, the incidence of complications during CEA was higher in the opioid combination group.
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To investigate the effect of electroacupuncture stimulation at "Zusanli"(ST36) and "Kunlun"(BL60) on the morphological changes of the spinal dorsal horn and the expression of p38 mitogen-activated protein kinase (p38MAPK) in the injured spinal cord of rats with neuropathic pain. ⋯ Electroacupuncture stimulation at ST36 and BL60 can increase pain threshold, improve the motor function of the affected hindlimb, and improve the necrosis of neurofibrils in the spinal dorsal horn in rats with neuropathic pain, possibly by regulating the expression of p-p38MAPK in the spinal dorsal horn.
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Biochem. Biophys. Res. Commun. · May 2020
Lemairamin, isolated from the Zanthoxylum plants, alleviates pain hypersensitivity via spinal α7 nicotinic acetylcholine receptors.
Lemairamin (also known as wgx-50), is isolated from the pericarps of the Zanthoxylum plants. As an agonist of α7 nicotinic acetylcholine receptors (α7nAChRs), it can reduce neuroinflammation in Alzheimer's disease. This study evaluated its antinociceptive effects in pain hypersensitivity and explored the underlying mechanisms. ⋯ In an α7nAChR antagonist-reversible manner, intrathecal lemairamin also stimulated spinal expression of IL-10 and β-endorphin, while lemairamin treatment induced IL-10 and β-endorphin expression in primary spinal microglial cells. In addition, intrathecal injection of a microglial activation inhibitor minocycline, anti-IL-10 antibody, anti-β-endorphin antiserum or μ-opioid receptor-preferred antagonist naloxone was all able to block lemairamin-induced mechanical antiallodynia in neuropathic pain. These data demonstrated that lemairamin could produce antinociception in pain hypersensitivity through the spinal IL-10/β-endorphin pathway following α7nAChR activation.
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Neuroinflammation plays a vital role in the development and maintenance of neuropathic pain. Recent evidence has proved that bone marrow mesenchymal stem cells (BMSCs) can inhibit neuropathic pain and possess potent immunomodulatory and immunosuppressive properties via secreting a variety of bioactive molecules, such as TNF-α-stimulated gene 6 protein (TSG-6). However, it is unknown whether BMSCs exert their analgesic effect against neuropathic pain by secreting TSG-6. Therefore, the present study aimed to evaluate the analgesic effects of TSG-6 released from BMSCs on neuropathic pain induced by chronic constriction injury (CCI) in rats and explored the possible underlying mechanisms in vitro and in vivo. ⋯ The present study demonstrated a paracrine mechanism by which intrathecal injection of BMSCs targets the TLR2/MyD88/NF-κB pathway in spinal cord dorsal horn microglia to elicit neuroprotection and sustained neuropathic pain relief via TSG-6 secretion.