1. The molecular skin pathology of familial primary localized cutaneous amyloidosis.
- Author
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Tanaka A, Lai-Cheong JE, van den Akker PC, Nagy N, Millington G, Diercks GF, van Voorst Vader PC, Clements SE, Almaani N, Techanukul T, Hide M, South AP, and McGrath JA
- Subjects
- Apoptosis Regulatory Proteins genetics, Cell Differentiation genetics, Cell Proliferation, Down-Regulation genetics, Female, Gene Expression Profiling, Heterozygote, Humans, Keratinocytes metabolism, Male, Nerve Tissue Proteins genetics, Netherlands, Skin metabolism, Stem Cells metabolism, Up-Regulation genetics, Amyloidosis, Familial genetics, Amyloidosis, Familial metabolism, Mutation, Missense genetics, Oncostatin M Receptor beta Subunit genetics, Skin Diseases, Metabolic genetics, Skin Diseases, Metabolic metabolism
- Abstract
Familial primary localized cutaneous amyloidosis (FPLCA) is an autosomal dominant disorder associated with chronic itching and skin lichenification. In lesional skin, there are apoptotic basal keratinocytes and deposits of amyloid material on degenerate keratin filaments in the upper dermis. The genetic basis of FPLCA involves mutations in the OSMR and IL31RA genes but the disease pathophysiology is not fully understood. In this study, we identified new pathogenic heterozygous missense mutations in the OSMR gene (p.Val631Leu and p.Asp647Tyr) in two Dutch FPLCA families. We then compared gene expression profiles between FPLCA lesional skin (n = 4) and site-matched control skin (n = 6). There was twofold or greater upregulation of 34 genes and downregulation of 43 genes. Most changes in gene expression (verified by quantitative RT-PCR) reflected alterations in epidermal differentiation and proliferation consistent with lichenification, but we also noted a reduction in several interfollicular keratinocyte stem cell markers in FPLCA skin. Differences in gene expression were also noted for proteins involved in apoptosis and nerve conduction. Collectively, this study expands the molecular basis of FPLCA and provides new insight into the skin pathology of this condition.
- Published
- 2010
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