Abstract
Cutaneous microdialysis demonstrates cytokine production in living human skin. In the present study, microdialysis samples taken from uninvolved and lesional skin in three test subjects with psoriasis over 24 h have been investigated for cytokine content with a bead-based multiplex immunoassay from Luminex. Concentration curves for a set of Th1/Th2 and pro-inflammatory cytokines measured differed from a reference group of ten subjects without psoriasis. The time to return to near baseline values after innate insertion reactivity is between 9 and 16 h. Post-equilibration levels (17–24 h) for the three main cytokines elevated in the reference group were differentially elevated outside the range of the reference group for interleukin-1β (IL1β) and IL8 but not so for IL6. Two further cytokines, granulocyte-macrophage colony-stimulating factor and tumor necrosis factor-α not generally elevated in the reference group, showed elevated values in the test subjects. Multivariate time series analysis (chemometry) showed that cytokine patterns for the individual test subjects often fell outside the 99% confidence intervals of a model generated from the reference group. In a clinical research situation, cutaneous microdialysis is feasible, gives generally higher cytokine levels than in the blood and generates interpretable data on an individual’s reactivity compared with a reference group. This may well prove useful in delineation of pathogenetic issues, selection of appropriate therapy and monitoring of subsequent response in inflammatory dermatoses such as psoriasis.
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ACKNOWLEDGEMENTS
This work has been supported by the Swedish Psoriasis Foundation and the Welander Foundation. We thank Mats Fredriksson LARC University of Linköping for statistical advice and Peter Anderson for work with illustrations.
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Fig. a
The findings of five pro-inflammatory cytokines in cutaneous microdialysis samples collected over 24 h from the uninvolved skin of three subjects with psoriasis (ps1, ps2, ps3) are shown. Samples were collected hourly except for the sample “13 h” which is the pooled sample collected during the night. The median and range of the reference group (black, n = 10) is also shown (JPEG 1421 kb)
Fig. b
The findings of five pro-inflammatory cytokines in cutaneous microdialysis samples collected over 24 h from the lesional skin of three subjects with psoriasis (ps1, ps2, ps3) are shown. Samples were collected hourly except for the sample “13 h” which is the pooled sample collected during the night. The median and range of findings from “normal” skin in a reference group (black, n = 10) is also shown (JPEG 1607 kb)
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Sjögren, F., Davidsson, K., Sjöström, M. et al. Cutaneous Microdialysis: Cytokine Evidence for Altered Innate Reactivity in the Skin of Psoriasis Patients?. AAPS J 14, 187–195 (2012). https://doi.org/10.1208/s12248-012-9331-z
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DOI: https://doi.org/10.1208/s12248-012-9331-z