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Targeting STAT3 with Conditional Knockout or PROTAC Technology Alleviates Renal Injury by Limiting Pyroptosis [ChIP-seq]

ABSTRACT: The role of signal transducer and activator of transcription protein 3 (STAT3) in AKI remains controversial. Our study demonstrated an upregulation of total STAT3 protein in AKI mouse models induced by cecal ligation and puncture (CLP) or ischemia-reperfusion (I/R), correlating with patient biopsy results. This increase may be attributed to histone H3K27 acetylation. STAT3 knockout in renal tubular epithelial cells significantly reduced AKI injury and inflammation in mice. Mechanistically, STAT3 induces the transcription of tripartite motif-containing protein 21 (TRIM21), triggering a cascade that activates gasdermin D (GSDMD), resulting in pyroptosis. Administration of the novel proteolysis-targeting chimera (PROTAC) compound E034, which selectively targets STAT3 for ubiquitination and degradation, significantly alleviated renal injury in a low-dose, single-dose regimen, underscoring its substantial therapeutic potential with infrequent dosing requirements. In the context of renal injury, PROTAC emerges as a promising modality by specifically targeting the STAT3/TRIM21/GSDMD axis, which our study has identified as a potential therapeutic target, thereby potentially endowing novel and clinically significant therapeutic strategies.

ORGANISM(S): Mus musculus

PROVIDER: GSE283158 | GEO | 2025/06/16

REPOSITORIES: GEO

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Project description:# Background Acute kidney injury (AKI) in sepsis patients increases patient mortality. Endothelial cells are important players in the pathophysiology of sepsis-associated AKI (SA-AKI), yet knowledge regarding their spatiotemporal involvement in coagulation disbalance and leukocyte recruitment is lacking. This study investigated the identity and kinetics of responses of different microvascular compartments in kidney cortex in response to SA-AKI. # Methods Laser microdissected arterioles, glomeruli, peritubular capillaries, and postcapillary venules from kidneys of mice subjected to cecal ligation and puncture (CLP) were analyzed using RNA sequencing. Differential expression and pathway enrichment analyses identified genes involved in coagulation and inflammation. A selection of these genes was evaluated by RT-qPCR in microvascular compartments of renal biopsies from patients with SA-AKI. The role of two identified genes in lipopolysaccharide-induced endothelial coagulation and inflammatory activation were determined in vitro in HUVEC using siRNA-based gene silencing. # Results CLP-sepsis in mice induced altered expression of approximately 400 genes in the renal microvasculature, with microvascular compartments exhibiting unique spatiotemporal responses. In mice, changes in gene expression related to coagulation and inflammation were most extensive in glomeruli at early and intermediate time points, with high induction of Plat, Serpine1, Thbd, Icam1, Stat3, and Ifitm3. In human SA-AKI, PROCR and STAT3 were induced in postcapillary venules, while SERPINE1 expression was diminished. IFITM3 was increased in arterioles and glomeruli. In vitro studies revealed that STAT3 and IFITM3 partly control endothelial coagulation and inflammatory activation. # Conclusion Renal microvascular compartments in mice and humans exhibited heterogeneous changes in coagulation- and inflammation-related gene expression in response to SA-AKI. Additional research should aim at understanding the functional consequences of the here described heterogeneous microvascular responses to establish the usefulness of identified genes as therapeutic targets in SA-AKI.

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Targeting STAT3 with Conditional Knockout or PROTAC Technology Alleviates Renal Injury by Limiting Pyroptosis [ChIP-seq]

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