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Modulation of Oxidative and ER Stress Pathways by the ADAM17 Inhibitor GW280264X in LPS-Induced Acute Liver Injury
Merve Huner Yigit1, Oguzhan Okcu2, Mehtap Atak1
1Department of Medical Biochemistry, Faculty of Medicine, Recep Tayyip Erdogan University, 53000 Rize, Türkiye.
Background And Objectives:
ADAM17, a sheddase that regulates cytokine and receptor ectodomains, amplifies inflammatory signaling. Acute liver injury (ALI) is driven by dysregulated inflammation, accompanied by both oxidative and endoplasmic reticulum (ER) stress responses. We investigated whether pharmacological inhibition of ADAM17 with GW280264X mitigates lipopolysaccharide (LPS)-induced acute liver injury by targeting these pathways.
Methods:
Male C57BL/6J mice received intraperitoneal LPS (10 mg/kg). GW280264X (500 µg/kg, i.p.) was administered at one and three hours post-LPS treatment. At the fifth hour, serum and liver samples were collected to determine serum ALT/AST levels and to perform hematoxylin and eosin (H&E) staining. Inflammatory (TNF-α), oxidative (MDA, 4-HNE, Fe2+, GSH; NRF2/KEAP1), endoplasmic reticulum (ER) stress (GRP78, ATF6, CHOP), and ferroptosis-related (GPX4, SLC7A11) markers, along with ADAM17 protein levels, were analyzed using ELISA, colorimetric assays, and Western blotting.
Results:
LPS triggered hepatic injury. This was accompanied by marked elevations in TNF-α, oxidative indices (MDA, 4-HNE, Fe2+) and ER stress proteins (GRP78, ATF6, CHOP), together with depletion of hepatic GSH. GW280264X significantly reduced AST levels, attenuated inflammatory, oxidative, and ER stress responses, and improved hepatic histopathology. GPX4 and SLC7A11 tended to increase following treatment, but the changes did not reach statistical significance and should be interpreted cautiously due to the limited sample size (n = 5). Similarly, ADAM17 protein levels tended to decrease, although the change was not statistically significant.
Conclusions:
Pharmacological inhibition of ADAM17 with GW280264X may confer early hepatoprotection in LPS-induced ALI by attenuating inflammatory, oxidative and ER stress pathways. ADAM17 inhibition yielded partial and statistically non-significant protective effects at this early stage; therefore, these findings should be considered exploratory. Future studies with larger sample sizes and longer observation periods are warranted to confirm the durability and mechanistic basis of this response.
