Abstract
Regulatory T cells (Tregs) are known to play critical roles in tissue repair via provision of growth factors, such as amphiregulin (Areg). Areg-producing Tregs have previously been difficult to study because of an inability to isolate live Areg-producing cells. In this report, we created a reporter mouse to detect Areg expression in live cells (AregThy1.1). We employed influenza A and bleomycin models of lung damage to sort Areg-producing and non-Areg-producing Tregs for transcriptomic analyses. Single-cell RNA-Seq revealed distinct subpopulations of Tregs and allowed transcriptomic comparisons of damage-induced populations. Single-cell TCR sequencing showed that Treg clonal expansion was biased toward Areg-producing Tregs and largely occurred within damage-induced subgroups. Gene module analysis revealed functional divergence of Tregs into immunosuppression-oriented and tissue repair–oriented groups, leading to identification of candidate receptors for induction of repair activity in Tregs. We tested these using an ex vivo assay for Treg-mediated tissue repair, identifying 4-1BB agonism as a mechanism for reparative activity induction. Overall, we demonstrate that the AregThy1.1 mouse is a promising tool for investigating tissue repair activity in leukocytes.
Authors
Lucas F. Loffredo, Katherine A. Kaiser, Adam Kornberg, Samhita Rao, Kenia de los Santos-Alexis, Arnold Han, Nicholas Arpaia
Figure 7
4-1BB agonism effects reparative activity induction and immunosuppression reduction in lung Tregs and identifies potential ligand-receptor interactions with structural tissue cells.
