BACKGROUND: Atopic dermatitis (AD) and psoriasis are common inflammatory skin diseases. Although many reports implicate Th2 cytokines in the pathophysiology of AD and Th1 cytokines in psoriasis, the precise etiology of these diseases remains elusive. OBJECTIVE: We investigated novel AD- or psoriasis-related genes to further understand the pathogenesis of these diseases. METHODS: We performed a comprehensive analysis of mRNA expression in skin biopsies from AD or psoriasis patients using DNA microarrays. Quantitative PCR was then used to monitor the expression of novel disease-related genes in human keratinocytes or pinnae from NC/Nga mice. RESULTS: Levels of mRNA for IDO (indoleamine 2,3-dioxygenase) and kynureninase, enzymes constituting the tryptophan degradation pathway, were found to be upregulated in the skin lesions as compared to the uninvolved skin of patients with AD or psoriasis. Expression of these two genes was induced in human epidermal keratinocytes stimulated with IFN-gamma in vitro. Moreover, in NC/Nga mice, the expression of kynureninase mRNA in the ear skin was induced following development of AD-like skin lesions. CONCLUSION: The tryptophan degradation pathway may play an important role in the pathophysiology of AD and psoriasis.
BACKGROUND:Atopic dermatitis (AD) and psoriasis are common inflammatory skin diseases. Although many reports implicate Th2 cytokines in the pathophysiology of AD and Th1 cytokines in psoriasis, the precise etiology of these diseases remains elusive. OBJECTIVE: We investigated novel AD- or psoriasis-related genes to further understand the pathogenesis of these diseases. METHODS: We performed a comprehensive analysis of mRNA expression in skin biopsies from AD or psoriasispatients using DNA microarrays. Quantitative PCR was then used to monitor the expression of novel disease-related genes in human keratinocytes or pinnae from NC/Nga mice. RESULTS: Levels of mRNA for IDO (indoleamine 2,3-dioxygenase) and kynureninase, enzymes constituting the tryptophan degradation pathway, were found to be upregulated in the skin lesions as compared to the uninvolved skin of patients with AD or psoriasis. Expression of these two genes was induced in human epidermal keratinocytes stimulated with IFN-gamma in vitro. Moreover, in NC/Nga mice, the expression of kynureninase mRNA in the ear skin was induced following development of AD-like skin lesions. CONCLUSION: The tryptophan degradation pathway may play an important role in the pathophysiology of AD and psoriasis.
Authors: Johann E Gudjonsson; Jun Ding; Andrew Johnston; Trilokraj Tejasvi; Andrew M Guzman; Rajan P Nair; John J Voorhees; Goncalo R Abecasis; James T Elder Journal: J Invest Dermatol Date: 2010-03-11 Impact factor: 8.551
Authors: Aishwarya P Yadama; Rachel S Kelly; Kathleen Lee-Sarwar; Hooman Mirzakhani; Su H Chu; Priyadarshini Kachroo; Augusto A Litonjua; Jessica Lasky-Su; Scott T Weiss Journal: Brain Behav Immun Date: 2019-10-10 Impact factor: 7.217
Authors: Jamie L Harden; Steven M Lewis; Samantha R Lish; Mayte Suárez-Fariñas; Daniel Gareau; Tim Lentini; Leanne M Johnson-Huang; James G Krueger; Michelle A Lowes Journal: J Allergy Clin Immunol Date: 2015-12-22 Impact factor: 10.793