Oxidative stress and mitochondrial dysfunction in Kindler syndrome

Area of Science:

• Dermatology
• Molecular Biology
• Cell Biology

Background:

• Kindler Syndrome (KS) is a rare genodermatosis caused by FERMT1 mutations, presenting with skin blistering, photosensitivity, premature aging, and cancer predisposition.
• The clinical variability and non-skin fragility features like aging and cancer predisposition in KS are not fully understood.
• Oxidative stress is implicated in KS pathogenesis, but cellular redox status alterations have not been previously investigated.

Purpose of the Study:

• To explore the role of oxidative stress in the pathogenesis of Kindler Syndrome.
• To investigate mitochondrial dysfunction in KS.
• To analyze cellular redox status in patient-derived cells.

Main Methods:

• Cultured patient-derived keratinocytes and controls, classified by mutation via PCR and Western blot.
• Analyzed oxidative stress biomarkers (MDA, GSSG/GSH ratio, GCL subunits) using spectrophotometry and qPCR.
• Assessed mitochondrial structure and function using confocal and electron microscopy, and redox biosensors.

Main Results:

• Patient keratinocytes exhibited altered oxidative stress biomarkers, including increased MDA and GSSG/GSH ratio, and modified GCL subunits.
• Electron and confocal microscopy revealed significant mitochondrial morphological abnormalities and functional derangement in KS skin biopsies and keratinocytes.
• These findings indicate a pro-oxidant state in KS, characterized by oxidative stress and mitochondrial dysfunction.

Conclusions:

• This study provides the first evidence of mitochondrial dysfunction in Kindler Syndrome.
• Oxidative stress is identified as a key factor in the pathogenesis of KS.
• The findings offer novel insights into the molecular mechanisms underlying this rare genodermatosis.