Geisshüsler, Helena; Marti, Eliane Isabelle; Stoffel, Michael Hubert; Kühni, Kathrin; Stojiljkovic, Ana; von Tscharner, Claudia; Vidondo Curras, Beatriz; Gerber, Vinzenz; Koch, Christoph (2016). Quantitative analysis of infiltrating immune cells and bovine papillomavirus type 1 E2-positive cells in equine sarcoids. Veterinary journal, 216, pp. 45-52. Elsevier 10.1016/j.tvjl.2016.06.016
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Quantitative analysis of infiltrating immune cells and bovine papillomavirus.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (1MB) | Request a copy |
Sarcoids are the most frequently observed skin tumours in equids and consist of cutaneous accumulations of transformed fibroblasts. Their aetiopathogenesis is closely linked to a presumably abortive infection by bovine papillomavirus (BPV) types 1 and 2. In cattle, dermal fibropapillomas induced by BPV1/2 usually regress spontaneously due to a local, cell-mediated, immune response; however, equids appear to lack an effective immune response to BPV1/2 and mechanisms of immune evasion have been postulated. As a consequence, equine sarcoids tend to persist and are prone to recur. In this study, cryosections were analysed by immunofluorescent staining and a high content analysis system to determine the presence and distribution of CD4(+), CD8(+), FoxP3(+), RORγt(-), CD206(+) and CD14(+) cells, along with expression of the BPV1 early regulatory protein E2. A higher density of cells was positive for BPV1 E2(+) within the transformed tissue than in perilesional tissue or normal skin of horses with sarcoids and control horses. The proportion of CD8(+) cytotoxic T cells was significantly increased in perilesional and lesional tissues, whereas CD4(+) T helper cells were present in higher density only in lesional tissue compared to normal skin from horses with and without sarcoids. The proportion of pro-inflammatory CD4(+)FoxP3(+)RORγt(+) regulatory T cells was decreased in sarcoid tissue compared to perilesional, distant and control tissue. There were no significant differences in densities of CD4(+)FoxP3(+) RORγt(-) regulatory T cells between sarcoids and control tissues. Equine sarcoids are characterised by infiltrations of CD8(+) and CD4(+) T cells, with decreased representation by pro-inflammatory CD4(+)FoxP3(+)RORγt(+) regulatory T cells.
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