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Background Despite significant advancements in therapeutic approaches for lung cancer, the prognosis of lung squamous cell carcinoma (LUSC) remains suboptimal, underscoring the critical need to identify novel molecular targets and develop targeted therapeutic strategies. Through bioinformatic analysis, SH3RF2 was identified as a gene significantly upregulated in LUSC patients, and its high expression was strongly associated with lower survival rates. However, no significant differences in expression or survival correlation were observed in lung adenocarcinoma. Notably, SH3RF2, an E3 ubiquitin ligase characterized by three SH3 domains, has not been systematically investigated in LUSC pathogenesis. Results Mechanistic investigations found that SH3RF2 promoted tumor cell proliferation, upregulated M2 markers (Arg-1, CD163, IL-10), increased CD206 + subpopulation of M0 THP-1 cells and enhanced migration and invasion of M0 THP-1 cells. SH3RF2 promoted the nuclear translocation of β-catenin. Furthermore, ICG-001, the inhibitors of β-catenin pathway, alleviated the above effects of SH3RF2. In vivo tumorigenesis experiments found that SH3RF2 promoted tumor growth and increased the proportion of M2 cells. Proteomic analysis revealed that SH3RF2 interacted with LZTS2 and regulated the ubiquitination of LZTS2 with RING domain. Overexpression of LZTS2 attenuated SH3RF2-induced nuclear translocation of β-catenin, suppressed cellular migration and invasion, and inhibited M2 polarization promoted by SH3RF2 overexpression. The combination of SH3RF2 knockdown and radiotherapy inhibited the growth of tumor compared with SH3RF2 knockdown or radiotherapy alone. Conclusions This study demonstrates the functionality of SH3RF2 in both potentiating tumor progression and inducing M2 macrophage polarization through coordinated regulation of LZTS2 degradation and β-catenin nuclear translocation. These findings establish a novel mechanistic framework and propose SH3RF2-associated signaling axes as promising therapeutic targets for LUSC.

Traumatic brain injury (TBI) is a major global burden of health. As an accepted inflammatory mediator, high mobility group box 1 (HMGB1) is found to be effective in facilitating neurogenesis and axonal regeneration. SH3RF2 (also known as POSHER), an E3 ligase SH3 domain-containing ring finger 2, belongs to the SH3RF family of proteins. Here, we aimed to investigate the role of redox states of HMGB1 on neurite outgrowth and regeneration both in vitro and in vivo . In this study, distinct recombinant HMGB1 redox isoforms were used. Sequencing for RNA-seq and data analysis were performed to find the potential downstream target of nonoxid-HMGB1 (3S-HMGB1). Protein changes and distribution of SH3RF2 were evaluated by western blot assays and immunofluorescence. Lentivirus and adeno-associated virus were used to regulate the expression of genes. Nonoxid-HMGB1-enriched exosomes were constructed and used to treat TBI rats. Neurological function was evaluated by OF test and NOR test. Results demonstrated that nonoxid-HMGB1 and fr-HMGB1, but not ds-HMGB1, promoted neurite outgrowth and axon elongation. RNA-seq and western blot assay indicated a significant increase of SH3RF2 in neurons after treated with nonoxid-HMGB1 or fr-HMGB1. Notably, the beneficial effects of nonoxid-HMGB1 were attenuated by downregulation of SH3RF2. Furthermore, nonoxid-HMGB1 ameliorated cognitive impairment in rats post-TBI via SH3RF2. Altogether, our experimental results suggest that one of the promoting neurite outgrowth and regeneration mechanisms of nonoxid-HMGB1 is mediated through the upregulated expression of SH3RF2. Nonoxid-HMGB1 is an attractive therapeutic candidate for the treatment of TBI.

Background The SH3RF2 gene is a protein-coding gene located in a quantitative trait locus associated with body weight, and its deletion has been shown to be positively associated with body weight in chickens. Results In the present study, CNV in the SH3RF2 gene was detected in 4079 individuals from 17 populations, including the “Gushi ×Anka” F2 resource population and populations of Chinese native chickens, commercial layers, and commercial broilers. The F2 resource population was then used to investigate the genetic effects of the chicken SH3RF2 gene. The results showed that the local chickens and commercial layers were all homozygous for the wild-type allele. Deletion mutation individuals were detected in all of the commercial broiler breeds except Hubbard broiler. A total of, 798 individuals in the F2 resource group were used to analyze the effects of genotype (DD/ID/II) on chicken production traits. The results showed that CNV was associated with 2-, 6-, 10-, and 12-week body weight (P = 0.026, 0.042, 0.021 and 0.039 respectively) and significantly associated with 8-week breast bone length (P = 0.045). The mutation was significantly associated with 8-week body weight (P = 0.007) and 4-week breast bone length (P = 0.010). CNV was significantly associated with evisceration weight, leg muscle weight, carcass weight, breast muscle weight and gizzard weight (P = 0.032, 0.033, 0.045, 0.004 and 0.000, respectively). Conclusions CNV of the SH3RF2 gene contributed to variation in the growth and weight gain of chickens.