Regulatory networks contributing to psoriasis susceptibility

Area of Science:

• Dermatology
• Molecular Biology
• Genomics

Background:

• Psoriasis pathogenesis involves complex genetic and molecular alterations.
• Non-lesional psoriatic skin exhibits distinct characteristics predisposing it to disease development.
• Understanding early molecular changes in unaffected skin is crucial for psoriasis research.

Purpose of the Study:

• To identify differentially regulated genes and proteins in non-involved psoriatic epidermis compared to normal epidermis.
• To uncover regulatory networks contributing to these molecular differences.
• To investigate early molecular events in psoriasis development.

Main Methods:

• Organotypic cultures of non-involved epidermis from healthy and psoriatic individuals.
• T-cell lymphokine induction to stimulate epidermal cultures.
• cDNA microarray analysis to compare gene expression profiles.
• Bioinformatics analysis to identify regulatory networks.

Main Results:

• Identified 61 annotated genes and 11 expressed transcripts with differential regulation in psoriatic non-involved epidermis.
• Bioinformatics analysis indicated abnormal regulation in cell morphology, development, and cell death.
• Differential regulation observed in small molecule and lipid metabolism in psoriatic epidermis.
• Abnormal regulation of Interleukin-23A (IL-23A) and Interleukin-1B (IL-1B) genes suggested as early pathogenic events.

Conclusions:

• Non-involved psoriatic skin possesses inherent molecular abnormalities.
• Altered gene expression in keratinocytes may initiate psoriasis pathogenesis.
• Dysregulation of IL-23A and IL-1B represents a potential early step in psoriasis development.