Laboratory on Thymus Research, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, RJ, Brazil.
National Institute for Science and Technology on Neuroimmunomodulation, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, RJ, Brazil.
J Leukoc Biol. 2022 May;111(5):1107-1121. doi: 10.1002/JLB.5COVA1121-626R. Epub 2022 Mar 24.
Infection by SARS-CoV-2 may elicit uncontrolled and damaging inflammatory responses. Thus, it is critical to identify compounds able to inhibit virus replication and thwart the inflammatory reaction. Here, we show that the plasma levels of the immunoregulatory neuropeptide VIP are elevated in patients with severe COVID-19, correlating with reduced inflammatory mediators and with survival on those patients. In vitro, vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP), highly similar neuropeptides, decreased the SARS-CoV-2 RNA content in human monocytes and viral production in lung epithelial cells, also reducing cell death. Both neuropeptides inhibited the production of proinflammatory mediators in lung epithelial cells and in monocytes. VIP and PACAP prevented in monocytes the SARS-CoV-2-induced activation of NF-kB and SREBP1 and SREBP2, transcriptions factors involved in proinflammatory reactions and lipid metabolism, respectively. They also promoted CREB activation, a transcription factor with antiapoptotic activity and negative regulator of NF-kB. Specific inhibition of NF-kB and SREBP1/2 reproduced the anti-inflammatory, antiviral, and cell death protection effects of VIP and PACAP. Our results support further clinical investigations of these neuropeptides against COVID-19.
SARS-CoV-2 的感染可能会引发不受控制的、破坏性的炎症反应。因此,识别能够抑制病毒复制并阻止炎症反应的化合物是至关重要的。在这里,我们表明,严重 COVID-19 患者的血浆中免疫调节神经肽 VIP 的水平升高,与炎症介质减少和患者存活相关。在体外,血管活性肠肽 (VIP) 和垂体腺苷酸环化酶激活肽 (PACAP),高度相似的神经肽,降低了人单核细胞中的 SARS-CoV-2 RNA 含量和肺上皮细胞中的病毒产量,也降低了细胞死亡。这两种神经肽均抑制肺上皮细胞和单核细胞中促炎介质的产生。VIP 和 PACAP 可防止 SARS-CoV-2 在单核细胞中诱导 NF-kB 和 SREBP1 和 SREBP2 的激活,这两种转录因子分别参与炎症反应和脂质代谢。它们还促进了 CREB 的激活,CREB 是一种具有抗细胞凋亡活性和 NF-kB 负调节剂的转录因子。NF-kB 和 SREBP1/2 的特异性抑制复制了 VIP 和 PACAP 的抗炎、抗病毒和细胞死亡保护作用。我们的研究结果支持对这些神经肽在 COVID-19 中的进一步临床研究。
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