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Myeloid FtH deficiency accelerates kidney disease by inducing Snca and ferroptosis

ABSTRACT: This study aimed to investigate impact of myeloid ferritin heavy chain (FtH) deletion on iron trafficking in kidney health and disease. Myeloid FtH deletion (FtHΔ/Δ) led to upregulation of synuclein-α (Snca) as the only iron-binding protein. When exposed to kidney injury, FtHΔ/Δ mice exhibited significantly worse kidney function. Transcriptome analysis identified ferroptosis as a key pathway triggered by FtH deletion. This was confirmed by elevated expression of ferroptosis-related genes, oxidative stress markers, and increased iron deposition in the kidneys. The latter was mediated via reprogramming of macrophages to an iron-recycling phenotype by inducing Spic. Mechanistically, we demonstrate ferrireductase activity of monomeric Snca acts as a catalyst triggering oxidative stress and ferroptosis. Moreover, kidney accumulation of Snca is promoted in kidney diseases marked by heavy leukocyte infiltration in both mice and humans. These findings emphasize role of FtH in regulating iron metabolism and promoting kidney repair by suppressing Snca and Spic.

ORGANISM(S): Mus musculus

PROVIDER: GSE291562 | GEO | 2025/03/17

REPOSITORIES: GEO

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Project description:Sepsis-associated acute kidney injury (SA-AKI) is a key contributor to the life threatening sequalae attributed to sepsis. Mechanistically, SA-AKI is a consequence of unabated myeloid cell activation and oxidative stress that induces tubular injury. Iron mediates inflammatory pathways directly and through regulating the expression of myeloid-derived ferritin, an iron storage protein comprised of ferritin light (FtL) and ferritin heavy chain (FtH) subunits. Previous work revealed myeloid FtH deletion leads to a compensatory increase in intracellular and circulating FtL and is associated with amelioration of SA-AKI. We designed this study to test the hypothesis that loss of myeloid FtL and subsequently, circulating FtL will exacerbate the sepsis-induced inflammatory response and worsen SA-AKI. We generated a novel myeloid-specific FtL knockout mouse (FtLLysM-/-) and induced sepsis via cecal ligation and puncture or lipopolysaccharide endotoxemia. As expected, serum ferritin levels were significantly lower in the knockout mice, suggesting that myeloid cells dominantly contribute to circulating ferritin. Interestingly, while sepsis induction led to a marked production of pro- and anti-inflammatory cytokines, there was no statistical difference between the genotypes. There was a similar loss of kidney function, as evident by a rise in serum creatinine and cystatin C, and renal injury identified by expression of kidney injury molecule-1 and neutrophil gelatinase associated lipocalin. Finally, RNA sequencing revealed upregulation of pathways for cell cycle arrest and autophagy post-sepsis, but no significant differences were observed between genotypes, including in key genes associated with ferroptosis, an iron-mediated form of cell death. The loss of FtL did not impact sepsis-mediated activation of NFkB or HIF-1a signaling, key inflammatory pathways associated with dysregulated host response. Taken together, while FtL overexpression was shown to be protective against sepsis, loss of FtL did not influence sepsis pathogenesis.

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Myeloid FtH deficiency accelerates kidney disease by inducing Snca and ferroptosis

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