title: Platelet P-selectin reflects a state of cutaneous inflammation: possible application to monitor treatment efficacy in psoriasis.
abstract: Haemostasis-maintaining platelets are also recognized as important modulators in the regulation of immune response. Activated platelets expressing P-selectin (CD62P) are involved in the extravasation of leucocytes. This study evaluated platelet P-selectin expression as a biomarker for cutaneous inflammation. P-selectin expression was assessed by flow cytometry in 147 successive patients suffering from an inflammatory or infectious skin condition at the day of admission for in-patient treatment as well as a day prior to demission. Forty-one patients admitted for allergy testing served as controls. A commercially available ELISA was used in 17 patients to determine soluble P-selectin in the plasma. In patients with psoriasis, the Psoriasis Area and Severity Index (PASI) was documented as a measure for disease severity. We observed a significant increase in platelet P-selectin expression in patients with inflammatory or infectious disorders, when compared to the control group (3,01% vs. 1,46%; P < 0.000001). Successful treatment resulted in a significant decrease in P-selectin expression to the level of the control group. In the case of psoriasis (n = 47), we found highly significant correlation between P-selectin and PASI (r = 0.51; P < 0.000001), as well as between the change in the PASI and the change in P-selectin expression (r = 0.4; P = 0.006). Platelet P-selectin expression as determined by flow cytometry correlated well with the results of soluble P-selectin, determined by ELISA (r = 0.63; P < 0.01). Thus, platelet P-selectin expression may be used as an efficacy biomarker to monitor treatment success in psoriasis. As platelet P-selectin correlates with soluble P-selectin in patient plasma, which can be measured by ELISA, the latter is feasible also for routine use.
authors.affiliation: Department of Dermatology, Clinic of the Goethe-University, Theodor-Stern-Kai 7, Frankfurt, Germany.
authors.forename: Jurate
authors.initials: J
authors.lastname: Garbaraviciene
authors.forename: Sandra
authors.initials: S
authors.lastname: Diehl
authors.forename: Domenica
authors.initials: D
authors.lastname: Varwig
authors.forename: Matilda
authors.initials: M
authors.lastname: Bylaite
authors.forename: Hanns
authors.initials: H
authors.lastname: Ackermann
authors.forename: Ralf J
authors.initials: RJ
authors.lastname: Ludwig
authors.forename: Wolf-Henning
authors.initials: WH
authors.lastname: Boehncke
mesh_terms: D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D015415:Biomarkers / Q000097:blood; D001792:Blood Platelets / Q000378:metabolism*; D002097:C-Reactive Protein / Q000378:metabolism; D016022:Case-Control Studies; D003872:Dermatitis / Q000097:blood*; D006801:Humans; D019007:P-Selectin / Q000097:blood*; D010789:Phototherapy; D011565:Psoriasis / Q000097:blood* / Q000175:diagnosis / Q000628:therapy*; D012720:Severity of Illness Index; D016896:Treatment Outcome
chemical_list: D000893:Anti-Inflammatory Agents; D015415:Biomarkers; D019007:P-Selectin; D002097:C-Reactive Protein