Thymic Stromal Lymphopoietin (TSLP) promotes human eosinophil‐basophil in situ hemopoieisis, and its secretion from human nasal epithelium is a function of TSLP genotype

Denburg, Judah A.; Hui, Claudia C.K.; Neighbour, Helen; Heroux, Delia; Akhabir, Loubna; Sandford, Andrew J.

doi:10.1186/2045-7022-5-s4-o3

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“…While we propose that LPA and TSLP are important inducers of itch, TSLP may affect inflammation as well. TSLP stimulates eosinophil degranulation in vitro (Cook et al 2012), increases eosinophilopoiesis (Denburg et al 2015), and increases eosinophil survival (Wong et al 2010). We hypothesize that EPX activity initiates a feedforward loop, though Il-1 and LPA, that recruits and activates more eosinophils, leading to chronic inflammation.…”

Section: Discussionmentioning

confidence: 99%

Eosinophil peroxidase induces inflammation in a mouse model of dermatitis

Roth-Carter

Luo

Ochkur

et al. 2020

Preprint

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Eosinophils play an important role in mediating itch and inflammation in dermatitis. The role of the eosinophil granule protein eosinophil peroxidase (EPX) in mediating inflammation and itch was tested in a dermatitis mouse model. Mice were sensitized to trimellitic anhydride (TMA) and subsequently challenged chronically on the ear to establish dermatitis. Loss of EPX (in EPX (-/-) mice) or blocking EPX with the drug resorcinol significantly reduced dermatitis in mice exposed to TMA. Resorcinol also reduced levels of thymic stromal lymphopoietin protein (TSLP) in skin. Further studies showed that EPX increased different cytokines in keratinocytes in cell culture via two distinct mechanisms. EPX induced TSLP expression requires lysophosphatidic acid signaling while EPX induced expression of TNF-α, CSF2, CSF3, and IL1α required IL-1 signaling. We also showed that blocking IL-1 reduced inflammation in skin following TMA exposure in mice. Thus, EPX is an important mediator of inflammation and itch, that are mediated via at least two pathways. This suggests that both EPX and its’ signaling pathways may provide novel therapeutic strategies in dermatitis.

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Section: Discussionmentioning

confidence: 99%