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Hauck, S.M. ; Lepper, M.F. ; Hertl, M.* ; Sekundo, W.* ; Deeg, C.A.*

Proteome dynamics in biobanked horse peripheral blood derived lymphocytes (PBL) with induced autoimmune uveitis.

Proteomics 17:1700013 (2017)

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Equine recurrent uveitis (ERU) is the only spontaneous model for recurrent autoimmune uveitis in humans, where T cells target retinal proteins. Differences between normal and autoaggressive lymphocytes were identified in this study by analyzing peripheral blood derived lymphocytes (PBL) proteomes from the same case with IRBP-induced uveitis sampled before (day 0), during (day 15) and after uveitic attack (day 23). Relative protein abundances of PBL were investigated in a quantitative, label-free differential proteome analysis in cells that were kept frozen for 14 years since the initial experiment. Quantitative data could be acquired for 2632 proteins at all three time-points. Profound changes (≥2 fold change) in PBL protein abundance were observed when comparing day 0 to 15, representing acute inflammation (1070 regulated proteins) and day 0 to 23 (cessation; 1571 regulated). Significant differences applied to proteins with functions in integrin signaling during active uveitis, involving "Erk and pi-3 kinase are necessary for collagen binding in corneal epithelia", "Integrins in angiogenesis" and "Integrin-linked kinase signaling" pathways. In contrast, at cessation of uveitic attack, significantly changed proteins belonged to pathways of "nongenotropic androgen signaling", "classical complement pathway" and "Amb2 integrin signaling". Several members of respective pathways were earlier shown to be changed in naturally occurring uveitis, underscoring the significance of these findings here and proofing the value of the induced model in mimicking spontaneous autoimmune uveitis. All MS data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository 2 (dataset identifier PXD005580).

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