[PDF][PDF] Intestinal inflammation alters the antigen-specific immune response to a skin commensal

GR Merana, LR Dwyer, MO Dhariwala, A Weckel… - Cell reports, 2022 - cell.com
GR Merana, LR Dwyer, MO Dhariwala, A Weckel, JR Gonzalez, JN Okoro, JN Cohen…
Cell reports, 2022cell.com
Resident microbes in skin and gut predominantly impact local immune cell function during
homeostasis. However, colitis-associated neutrophilic skin disorders suggest possible
breakdown of this compartmentalization with disease. Using a model wherein neonatal skin
colonization by Staphylococcus epidermidis facilitates generation of commensal-specific
tolerance and CD4+ regulatory T cells (Tregs), we ask whether this response is perturbed by
gut inflammation. Chemically induced colitis is accompanied by intestinal expansion of S …
Summary
Resident microbes in skin and gut predominantly impact local immune cell function during homeostasis. However, colitis-associated neutrophilic skin disorders suggest possible breakdown of this compartmentalization with disease. Using a model wherein neonatal skin colonization by Staphylococcus epidermidis facilitates generation of commensal-specific tolerance and CD4+ regulatory T cells (Tregs), we ask whether this response is perturbed by gut inflammation. Chemically induced colitis is accompanied by intestinal expansion of S. epidermidis and reduces gut-draining lymph node (dLN) commensal-specific Tregs. It also results in reduced commensal-specific Tregs in skin and skin-dLNs and increased skin neutrophils. Increased CD4+ circulation between gut and skin dLN suggests that the altered cutaneous response is initiated in the colon, and resistance to colitis-induced effects in Cd4creIl1r1fl/fl mice implicate interleukin (IL)-1 in mediating the altered commensal-specific response. These findings provide mechanistic insight into observed connections between inflammatory skin and intestinal diseases.
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