Document Detail

Glutathione S-transferase M1 (GSTM1) genotype but not GSTT1 or MC1R genotype influences erythemal sensitivity to narrow band (TL-01) UVB phototherapy.
MedLine Citation:
PMID:  20802377     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: Although a majority of psoriasis patients respond to treatment with narrow band ultraviolet B radiation (TL-01) phototherapy, it is currently not possible to predict erythemal sensitivity, or to identify treatment responders. A variety of antioxidant enzymes, including the polymorphic glutathione S-transferase GSTM1 and GSTT1 genes, protect the cell from UVR-induced oxidative challenge. GSTM1 and GSTT1 are deleted in approximately 50 and 20% of the Caucasian population, respectively, and GST null genotype has been associated with increased sunburn sensitivity and reduced minimal erythemal dose (MED) after broadband UVR exposure in healthy volunteers and with susceptibility to skin cancer. Another polymorphic determinant of UVR sensitivity is the melanocortin 1 receptor (MC1R), which protects cells from UVR-induced apoptosis and photodamage. Our aim was therefore to investigate whether GST or MC1R genotype influenced erythemal sensitivity to narrow band (TL-01) ultraviolet B radiation phototherapy in patients with psoriasis.
METHODS: We used TaqMan quantitative gene copy and allelic discrimination assays to determine GST and MC1R genotypes, and looked for possible associations between genotype and threshold erythemal sensitivity (MED) and treatment outcomes in patients with psoriasis (n=256).
RESULTS: We showed that GSTM1 genotype, but not GSTT1 or MC1R genotype influences erythemal sensitivity to TL-01 phototherapy, with a significantly lower MED observed in GSTM1 null individuals [χ(2 d.f.)=8.862, P=0.012]. None of the genotypes studied were associated with TL-01 treatment outcomes or relapse rates.
CONCLUSION: GSTM1 genotype may have clinical utilityin the prediction of photosensitivity and/or in identifying patients at increased risk of treatment-related side effects.
Gillian Smith; Simone Weidlich; Robert S Dawe; Sally H Ibbotson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pharmacogenetics and genomics     Volume:  21     ISSN:  1744-6880     ISO Abbreviation:  Pharmacogenet. Genomics     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101231005     Medline TA:  Pharmacogenet Genomics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  217-24     Citation Subset:  IM    
aBiomedical Research Institute bPhotobiology Unit, University of Dundee, Ninewells Hospital and Medical School, Dundee, UK.
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