Nrf2 Activation by SK-119 Attenuates Oxidative Stress, UVB, and LPS-Induced Damage

Area of Science:

• Biochemistry
• Dermatology
• Pharmacology

Background:

• The Nrf2 signaling pathway is crucial for cellular defense against oxidative stress.
• Activating Nrf2 offers therapeutic potential for oxidative stress-related disorders.
• Computer-aided drug design yielded novel Nrf2 enhancers, including SK-119.

Purpose of the Study:

• To investigate the efficacy of (E)-5-oxo-1-(4-((2,4,6-trihydroxybenzylidene)amino)phenyl)pyrrolidine-3-carboxylic acid (SK-119) in mitigating skin oxidative damage.
• To evaluate SK-119's impact on Nrf2 activation and its protective effects in dermatological models.

Main Methods:

• SK-119 was initially tested in PC-12 cells to assess its effect on oxidative stress-induced cytotoxicity and Nrf2 activation.
• In vitro (HaCaT cells) and ex vivo (human skin organ culture) models were used to evaluate SK-119's impact on skin.
• The compound's anti-inflammatory and photoprotective properties were assessed, including its effects on cytokine secretion, UVB-induced oxidative stress, apoptosis, and DNA damage.

Main Results:

• SK-119 treatment attenuated oxidative stress-induced cytotoxicity and activated Nrf2 in PC-12 cells.
• The compound exhibited significant anti-inflammatory properties, reducing lipopolysaccharide (LPS)-induced cytokine secretion comparable to dexamethasone.
• Topical SK-119 application blocked UVB-induced oxidative stress, reduced caspase-mediated apoptosis, and prevented DNA adduct formation in skin models.

Conclusions:

• SK-119 functions as an Nrf2 activator.
• The compound demonstrates potent anti-inflammatory and photoprotective effects.
• SK-119 serves as a promising prototype for developing new treatments for oxidative stress-related dermatological disorders.