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Wu S, Romero-Ramírez L, Mey J. Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress. J Cell Physiol. 2021;doi: 10.1002/jcp.30619.
Wu, S., Romero-Ramírez, L., & Mey, J. (2021). Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress. Journal of cellular physiology, . https://doi.org/10.1002/jcp.30619
Wu, Siyu, et al. "Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress." Journal of cellular physiology vol. (2021). doi: https://doi.org/10.1002/jcp.30619
Wu S, Romero-Ramírez L, Mey J. Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress. J Cell Physiol. 2021 Oct 27; doi: 10.1002/jcp.30619. Epub 2021 Oct 27. PMID: 34705285.
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J Cell Physiol. 2021 Oct 27; doi: 10.1002/jcp.30619. Epub 2021 Oct 27.

Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress.

Journal of cellular physiology

Siyu Wu, Lorenzo Romero-Ramírez, Jörg Mey

Affiliations

  1. Unidad de Investigación, Laboratorio LRNI, Hospital Nacional de Parapléjicos, Toledo, Spain.
  2. School of Mental Health and Neuroscience and EURON Graduate School of Neuroscience, Maastricht University, Maastricht, The Netherlands.

PMID: 34705285 DOI: 10.1002/jcp.30619

Abstract

Spinal cord injury (SCI) causes cell death and consequently the breakdown of axons and myelin. The accumulation of myelin debris at the lesion site induces inflammation and blocks axonal regeneration. Hematogenous macrophages contribute to the removal of myelin debris. In this study, we asked how the inflammatory state of macrophages affects their ability to phagocytose myelin. Bone marrow-derived macrophages (BMDM) and Raw264.7 cells were stimulated with lipopolysaccharides (LPS) or interferon gamma (IFNγ), which induce inflammatory stress, and the endocytosis of myelin was examined. We found that activation of the TLR4-NFκB pathway reduced myelin uptake by BMDM, while IFNγ-Jak/STAT1 signaling did not. Since bile acids regulate lipid metabolism and in some cases reduce inflammation, our second objective was to investigate whether myelin clearance could be improved with taurolithocholic acid (TLCA), tauroursodeoxycholic acid or hyodeoxycholic acid. In BMDM only TLCA rescued myelin phagocytosis, when this activity was suppressed by LPS. Inhibition of protein kinase A blocked the effect of TLCA, while an agonist of the farnesoid X receptor did not rescue phagocytosis, implicating TGR5-PKA signaling in the effect of TLCA. To shed light on the mechanism, we measured whether TLCA affected the expression of CD36, triggering receptor on myeloid cells-2 (TREM2), and Gas6, which are known to be involved in phagocytosis and affected by inflammatory stimuli. Concomitant with an increase in expression of tumour necrosis factor alpha, LPS reduced expression of TREM2 and Gas6 in BMDM, and TLCA significantly diminished this downregulation. These findings suggest that activation of bile acid receptors may be used to improve myelin clearance in neuropathologies.

© 2021 The Authors. Journal of Cellular Physiology published by Wiley Periodicals LLC.

Keywords: Gpbr-1; TGR5; bile acid; inflammation; macrophage; myelin; phagocytosis

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