iNOS deficiency aggravates DNFB-induced atopic dermatitis in mice.

Area of Science:

• Dermatology
• Immunology
• Molecular Biology

Background:

• Atopic dermatitis (AD) is a prevalent chronic inflammatory skin condition.
• Immune homeostasis imbalance is central to AD pathogenesis.
• Nitric oxide (NO), synthesized by inducible nitric oxide synthase (iNOS), plays a key role in skin immune regulation.

Purpose of the Study:

• To investigate the specific mechanisms of iNOS in regulating AD development.
• To elucidate the role of iNOS in modulating skin immune homeostasis in AD.

Main Methods:

• Immunofluorescence staining to detect iNOS expression in AD lesions.
• qRT-PCR and pathological staining for inflammatory markers.
• Flow cytometry and immunofluorescence for immune cell infiltration.
• RNA-sequencing to explore iNOS regulatory mechanisms.
• In vitro stimulation of keratinocytes and fibroblasts.

Main Results:

• iNOS expression was significantly upregulated in AD lesions.
• iNOS deficiency exacerbated AD-like inflammation.
• iNOS deficiency promoted IL-17 signaling pathway effector molecules and increased IL-17A+ T cells.
• iNOS deficiency upregulated cytokine expression in skin cells.

Conclusions:

• iNOS deficiency aggravated AD-like inflammatory responses.
• The exacerbation is potentially linked to heightened IL-17 signaling activity.