Multifaceted array-based keloidal gene expression profiling reveals specific MDFI upregulation in keloid lesions.

Area of Science:

• Dermatology
• Molecular Biology
• Genomics

Background:

• Keloid lesions exhibit mesenchymal cell proliferation and excessive extracellular matrix deposition.
• The precise molecular pathology of keloid development remains unclear despite previous studies.

Purpose of the Study:

• To identify essential molecules involved in keloid development using microarray analysis.
• To explore the molecular differences between keloid tissues and lesional fibroblasts.

Main Methods:

• Microarray analysis of keloid and nonlesional skin tissues (in vivo and in vitro).
• Gene expression comparison between tissues and cells.
• Quantitative reverse transcription (qRT)-PCR and immunohistochemical staining for validation.

Main Results:

• Several molecules, including PTPRD and NTM, were upregulated in keloid tissues and fibroblasts.
• MDFI and ITGA4 were central in keloid gene coexpression networks.
• MDFI expression was significantly elevated in keloid tissues, with MDFI-positive fibroblasts located in the keloid-associated lymphoid tissue (KALT).

Conclusions:

• Gene expression profiles can differentiate keloid tissue from cultured fibroblasts.
• MDFI is commonly expressed in both keloid tissues and cells.
• MDFI-positive cells within the KALT may play a significant role in keloid pathogenesis and are relevant for in vitro studies.