title: Modulation of the atopy patch test reaction by topical corticosteroids and tar.
abstract: BACKGROUND
  Pharmacologic studies in atopic eczema (AE) are difficult to standardize. Patients with AE differ in the stage of their skin disease (acute, subacute, chronic).
  
  
  OBJECTIVE
  This study was designed to assess macroscopic and microscopic effects of pretreatment with topical glucocortico-steroids (GCSs) and tar on the atopy patch test (APT) reaction in patients with atopic eczema.
  
  
  METHODS
  Nonlesional skin of the back of patients with AE (n = 6) was treated for 3 weeks at 3 different sites with triamcin-olonacetonide 0.1% in cetamacrogol ointment (GCSs), pix liquida 10% in cetamacrogol ointment (tar), and cetamacrogol ointment (vehicle), respectively. APTs were performed, and biopsy specimens were taken from all these sites (time = 0 and 24 hours) for immunohistochemical analysis.
  
  
  RESULTS
  Treatment with both GCSs and tar was able to reduce the macroscopic outcome of the APT reaction. Furthermore, both treatment modalities had an almost equally inhibiting effect on the influx of T cells, eosinophils, and CD1(+), RFD1(+), IFN-gamma(+), and IL-4(+) cells, as well as on the percentage of vessels expressing the adhesion molecules vascular cell adhesion molecule 1 and E-selectin in response to epicutaneous aeroallergen challenge.
  
  
  CONCLUSIONS
  Although both treatments significantly reduced the various cellular constituents of allergic inflammation, all cell types remained present. In addition, this study shows that the APT can be used to evaluate the effect of topical anti-inflammatory treatments on allergic inflammation in patients with AE.
authors.affiliation: Department of Dermatology/Allergology, University Medical Center Utrecht, Utrecht, The Netherlands.
authors.forename: E G
authors.initials: EG
authors.lastname: Langeveld-Wildschut
authors.forename: H
authors.initials: H
authors.lastname: Riedl
authors.forename: T
authors.initials: T
authors.lastname: Thepen
authors.forename: I C
authors.initials: IC
authors.lastname: Bihari
authors.forename: P L
authors.initials: PL
authors.lastname: Bruijnzeel
authors.forename: C A
authors.initials: CA
authors.lastname: Bruijnzeel-Koomen
mesh_terms: D000287:Administration, Topical; D000328:Adult; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage*; D003876:Dermatitis, Atopic / Q000175:diagnosis*; D005260:Female; D005938:Glucocorticoids; D006801:Humans; D008297:Male; D009824:Ointments; D010328:Patch Tests / Q000379:methods*; D012867:Skin / Q000187:drug effects; D013638:Tars / Q000494:pharmacology*; D013997:Time Factors; D014222:Triamcinolone Acetonide / Q000008:administration & dosage
chemical_list: D000893:Anti-Inflammatory Agents; D005938:Glucocorticoids; D009824:Ointments; D013638:Tars; D014222:Triamcinolone Acetonide