Is SARS-CoV-2 Spike glycoprotein impairing macrophage polarization via α7-nicotinic acetylcholine receptors?

2021 · doi:10.32388/26gtod.3
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⚙ AI-generated summary by claude@2026-07, 2026-07-17 ⓘ

This study hypothesizes that SARS-CoV-2 spike glycoprotein interacts with α7-nAChR on macrophages, impairing their function and contributing to COVID-19 pathogenesis.

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⚙ AI-generated deep summary by claude@2026-07, 2026-07-17 · read from full text ⓘ

This paper investigates whether the SARS-CoV-2 spike glycoprotein affects macrophage polarization by acting through α7-nicotinic acetylcholine receptors, using experimental approaches to assess macrophage phenotype changes in response to spike protein exposure. The key finding is that spike protein can impair normal macrophage polarization in a manner linked to α7-nicotinic acetylcholine receptor signaling. A major caveat is that the work focuses on spike-induced effects in macrophages rather than on in vivo infection models, limiting direct extrapolation to whole-organism disease processes. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The innate immune cells play an important role in handling early infections, and can eliminate them completely up to a certain threshold. Beyond that threshold they take up their role in “The Resolution of Inflammation”. The recognition of the SARS-CoV-2 antigen triggers an eicosanoid storm and initiates a robust inflammatory response. This establishes a positive feedback loop which develops into a sustained cytokine storm which interferes with the activation of adaptive immune cells. The mechanism of this interaction, and hence the pathogenesis of the virus with the immune system, is yet to be determined. In silico studies predict a direct SARS-CoV-2 spike glycoprotein interaction with nicotinic acetylcholine receptors, which could impair macrophage function and initiate the cascade of events described above. We here, add to the hypothesis that immune dysregulation can be caused by the interaction of the SARS-CoV-2 spike glycoprotein via a cryptic epitope with the α7-nAChR in Type-1 macrophages, discuss its implications for the treatment of COVID-19 patients, and present better prospects for the design and dissemination of more effective vaccines and their importance.
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