Gapmer Antisense Oligonucleotide Targeting E-Cadherin Rescues Abnormal Keratinization in X-Linked Ichthyosis Models

Area of Science:

• Dermatology
• Genetics
• Molecular Biology

Background:

• X-linked ichthyosis (XLI) is an inherited skin disorder caused by steroid sulfatase (STS) deficiency, with no current effective therapies.
• E-cadherin is overexpressed in STS-deficient keratinocytes and is a potential therapeutic target for XLI.

Purpose of the Study:

• To investigate the role of E-cadherin in keratinocyte differentiation and its therapeutic potential for XLI.
• To develop and evaluate an E-cadherin-targeting antisense oligonucleotide for XLI treatment.

Main Methods:

• Mutations were introduced into the N-terminal region of E-cadherin to assess its role in keratinocyte differentiation.
• A microRNA (miR-6766) and a gapmer antisense oligonucleotide (gASO) were used to modulate E-cadherin expression in HaCaT cells.
• The efficacy of gASO in suppressing E-cadherin and keratinocyte differentiation markers was evaluated.

Main Results:

• Mutations in the E-cadherin N-terminal region impaired keratin 1 expression, highlighting its importance in differentiation.
• miR-6766 and gASO treatments downregulated keratinocyte differentiation markers.
• The gASO demonstrated enhanced potency and stability, leading to significant suppression of E-cadherin and keratin 1 expression compared to miR-6766.

Conclusions:

• E-cadherin plays a critical role in regulating keratinocyte differentiation.
• An E-cadherin-targeting gASO effectively suppresses abnormal keratinocyte differentiation.
• This gASO represents a promising therapeutic strategy for X-linked ichthyosis.