TY - JOUR
T1 - Lack of evidence for activation of the hedgehog pathway in psoriasis
AU - Gudjonsson, Johann E.
AU - Aphale, Abhishek
AU - Grachtchouk, Marina
AU - Ding, Jun
AU - Nair, Rajan P.
AU - Wang, Timothy
AU - Voorhees, John J.
AU - Dlugosz, Andrzej A.
AU - Elder, James T.
N1 - Funding Information:
This work was supported by the Dermatology Foundation (JEG), the American Skin Association (JEG), the National Institute of Arthritis, Musculoskeletal, and Skin Diseases (AR052889; JTE). We acknowledge Dr D Thomas for generously contributing reagents. We thank the volunteers who provided blood and skin samples for this study, and acknowledge the skilled technical assistance of Linda Hodges, Kathleen McCarthy, and Suzan Rehbine.
PY - 2009/3
Y1 - 2009/3
N2 - Recent reports have suggested that the hedgehog (Hh) pathway is activated in lesional psoriatic skin, and that treatment with the Hh pathway antagonist cyclopamine may lead to rapid resolution of the disease. To assess Hh pathway activity in psoriasis, we isolated RNA from lesional and uninvolved skin of 58 psoriatic patients, and from 63 normal control subjects, and subjected these samples to global gene expression profiling on Affymetrix HU133 Plus 2.0 gene arrays. We were especially interested in Hh target genes (PTCH1 and GLI1), whose expression is elevated in response to Hh signaling. The microarray data demonstrated downregulation of PTCH1 expression in uninvolved and lesional skin (1.1-fold and 2-fold, respectively; P<0.0001). Additionally GLI1 mRNA was downregulated in lesional skin (1.7 fold; P<0.05). No significant changes were observed between lesional and uninvolved skin for the Hh ligands or Smoothened. Quantitative PCR confirmed these findings. In situ hybridization for GLI1 and PTCH1 was positive in basal cell carcinoma tumor cells, but was negligible in uninvolved or lesional psoriatic skin. The absence of elevated Hh target gene expression in lesional psoriatic skin indicates that the Hh pathway is not activated in this disease, raising questions regarding the proposed use of Hh antagonists as antipsoriatic agents.
AB - Recent reports have suggested that the hedgehog (Hh) pathway is activated in lesional psoriatic skin, and that treatment with the Hh pathway antagonist cyclopamine may lead to rapid resolution of the disease. To assess Hh pathway activity in psoriasis, we isolated RNA from lesional and uninvolved skin of 58 psoriatic patients, and from 63 normal control subjects, and subjected these samples to global gene expression profiling on Affymetrix HU133 Plus 2.0 gene arrays. We were especially interested in Hh target genes (PTCH1 and GLI1), whose expression is elevated in response to Hh signaling. The microarray data demonstrated downregulation of PTCH1 expression in uninvolved and lesional skin (1.1-fold and 2-fold, respectively; P<0.0001). Additionally GLI1 mRNA was downregulated in lesional skin (1.7 fold; P<0.05). No significant changes were observed between lesional and uninvolved skin for the Hh ligands or Smoothened. Quantitative PCR confirmed these findings. In situ hybridization for GLI1 and PTCH1 was positive in basal cell carcinoma tumor cells, but was negligible in uninvolved or lesional psoriatic skin. The absence of elevated Hh target gene expression in lesional psoriatic skin indicates that the Hh pathway is not activated in this disease, raising questions regarding the proposed use of Hh antagonists as antipsoriatic agents.
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U2 - 10.1038/jid.2008.266
DO - 10.1038/jid.2008.266
M3 - Article
C2 - 18754037
AN - SCOPUS:59949101719
SN - 0022-202X
VL - 129
SP - 635
EP - 640
JO - Journal of Investigative Dermatology
JF - Journal of Investigative Dermatology
IS - 3
ER -