dsHMGB1, released from IL-17A-induced pyroptotic prostate epithelial cells, drives M1 polarization by promoting Pfkp-mediated glycolysis via Jak2/Stat1 transcription in experimental autoimmune prostatitis.

Abstract

Background: Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is a prevalent urological disorder in males, characterized by an unknown mechanism and limited therapeutic efficacy. The involvement of high mobility group box 1 (HMGB1)-mediated macrophage polarization has been extensively explored in various immune-inflammatory conditions; however, its potential role in CP/CPPS has not yet been examined. Method: In experimental autoimmune prostatitis (EAP) mouse model, with various treatments including anti-IL-17A, Bz-ATP, or glycyrrhizic acid (GA, a HMGB1 inhibitor). In vitro, prostate epithelial cells (PECs) and immortalized bone marrow-derived macrophages (iBMDM) were treated with IL-17A, disulfide HMGB1 (dsHMGB1), or fludarabine (Flu, a Stat1 inhibitor). Histological analysis, immunofluorescence, TUNEL, ELISA, reactive oxygen species detection, glucose uptake, lactate assays, flow cytometry, western blot, proteome sequence, differential gene analysis, RT-qPCR, ChIP-qPCR, and dual-luciferase assay, etc. were used for the detection of phenotypes and exploration of mechanisms. Results: We confirmed that IL-17A could induce pyroptosis in PECs and release dsHMGB1 in vitro, the similar function presented in vivo as well, and can be reversed by Bz-ATP. Additionally, dsHMGB1 enhances glycolytic metabolism via the Jak2/Stat1 pathway, thereby promoting polarization of M1 macrophage. Pfkp, a rate-limiting enzyme involved in glycolysis, plays a critical role in this metabolic shift. ChIP-qPCR and luciferase assays demonstrated that Stat1 can transcriptionally regulate Pfkp. In the rescue experiments, we also demonstrated that GA and Flu could potentially be the therapeutic options for CP/CPPS. Conclusions: IL-17A-mediated pyroptosis in prostate epithelial cells triggers the release of dsHMGB1, which transcriptional regulates the key glycolytic enzyme Pfkp through the Jak2/Stat1 transcription to promote the M1 polarization of macrophages. Targeting dsHMGB1 or Stat1 could be potential therapeutic strategies for managing CP/CPPS by regulating M1 macrophage polarization and reducing inflammatory cytokines.