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Dermal fibroblast cultures recapitulate differences between deermice and mice in responses to a Toll-like receptor agonist

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Nov 04, 2025 version files 176.63 MB

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Abstract

The white-footed deermouse Peromyscus leucopus is a primary reservoir for the agents of Lyme disease and other zoonoses in North America. These and other species of Peromyscus are tolerant of the infection by the bacteria, protozoa, and viruses they host. This is mainly achieved by mitigating the damaging effects of the innate immune response. In previous studies, we demonstrated differences between P. leucopus and either inbred or outbred M. musculus in the degree of sickness and profiles of biomarkers after exposure to bacterial lipopolysaccharide, a TLR4 agonist. To develop a method for broadly assessing of innate immunity of capture-release mammals in nature, we evaluated using bulk and single-cell RNA-seq primary dermal fibroblast cultures of P. leucopus and M. musculus in their short-term responses to a lipopeptide that is a TLR2 agonist. As we had observed for experimental animals, the fibroblast cultures of the two species displayed both similarities and differences in their responses to the agonist. The notable differences included the greater magnitude of an anti-viral profile of cytokines and other effectors in the deermouse fibroblasts and the occurrence of an interleukin-11 response in the mouse cultures but not deermouse. We also observed in both species' cultures an increased transcription of several types of endogenous retrovirus (ERV) elements after exposure of the cells to the agonist. The P. leucopus cells were distinguished from M. musculus cells in the generally shorter retroviral open reading frames among the differentially expressed sequences. This was consistent with previous findings about ERV transcription in P. leucopus and M. musculus and suggests a greater suppression of ERV activity in P. leucopus. The results affirm the feasibility of this in vitro model for both laboratory- and field-based studies without need for euthanasia, and that inherent differences between deermice and mice in innate immune responses can be demonstrated in primary fibroblasts as well as the animals themselves.