Glioma is a type of tumor derived from glial cells in the spine or brain and accounts for approximately 80% of malignant brain tumors [27]. At present, the treatment of glioma primarily relies on surgery supplemented by postoperative radiotherapy and chemotherapy. Owing to their invasive growth characteristics, gliomas cannot be completely removed by surgery [28]. Therefore, identifying effective biomarkers for the early diagnosis of glioma can improve patient treatment outcomes and prognosis. Through bioinformatics analysis and biological experiments, this study revealed that LINC00601 acts as a potential prognostic marker and oncogene in glioma.
The LINC00601 gene, noted for its elevated expression in various cancers, is located on chromosome 10 at position 10q26.2. It spans 8,013 bases and is oriented on the minus strand. Y.-C. WANG et al. first demonstrated in vitro that LINC00601 promotes HCC cell proliferation, affects cell cycle distribution and inhibits apoptosis in the G1/G0 phase [24]. SHI X. et al. reported that LINC00601 expression may be associated with a poor prognosis in patients with esophageal squamous cell carcinoma [29]. In this study, we observed significant upregulation of LINC00601 in glioma, along with a strong correlation between its expression and histological grade. Elevated p-STAT3 activity has been associated with increased proliferation, survival, and invasion of glioma cells, contributing to the aggressive nature of these tumors [25]. Thus, LINC00601 may be related to the p-STAT3 signaling pathway, which needs to be confirmed by further study. Furthermore, our findings indicate that high LINC00601 expression is significantly associated with reduced overall survival and increased recurrence risk in glioma patients. Functionally, knockdown of LINC00601 significantly inhibited cell proliferation, colony formation, migration, and invasion in vitro and tumor growth in vivo. Overall, LINC00601 can be considered a potential prognostic marker and therapeutic target for gliomas.
LncRNAs are RNA molecules that are more than 200 nucleotides in length and cannot be translated into proteins due to the lack of a promoter [30]. Although lncRNAs do not directly participate in protein coding, an increasing number of experimental findings have demonstrated that their abnormal expression leads to tumor cell development, which subsequently impacts prognosis and survival rates. For example, H19 lncRNA expression is significantly increased in many human malignant tumors, and elevated H19 expression is typically associated with a poor prognosis in cancer patients [31]. Ohgaki H et al. investigated autophagy-related lncRNAs in glioma patients and identified 10 such lncRNAs as independent prognostic factors [32]. Five of these lncRNAs (TP53TG1, ZNF674-AS1, COX10AS1, DDX11-AS1, and SBF2-AS1) were identified as adverse prognostic factors, whereas the other five (PCBP1)-AS1, DHRS4-AS1, GABPB1-AS1, MAPKAPK5-AS1, and MIR4453HG) were favorable prognostic factors [33]. In this study, using the TCGA and CGGA databases, we found that upregulation of LINC00601 expression is associated with increased malignancy and a poor prognosis in glioma patients. Additionally, LINC00601 expression was significantly higher in recurrent gliomas than in primary gliomas. These findings suggest that LINC00601 could serve as a potential prognostic marker and therapeutic target for glioma.
LncRNAs play crucial roles in regulating cell proliferation, apoptosis, differentiation, and the response to hypoxia stress by actively participating in nuclear interference [34], transcriptional activation [35], and chromatin modification [28]. Consequently, they play key roles in the progression of glioma.
Zhou, K et al. reported that the expression of the lncRNA NEAT1 is upregulated in glioma. It promotes glioma formation by inhibiting the expression of miR-132, thereby alleviating the negative regulatory effect of miR-132 on SOX2 [36]. In primary GBM tumors, SChLAP1 expressed at high levels interacts with heterogeneous nuclear ribonucleoprotein L (HNRNPL), leading to increased binding of HNRNPL to α-actinin-4 (ACTN4). This interaction inhibits the degradation of ACTN4, which in turn increases the activity of nuclear factor κB (NF-κB) signaling, a pathway associated with cancer progression [37]. Here, we observed that the knockdown of LINC00601 suppressed the proliferation, migration, and invasion of glioma cells. Furthermore, knockdown of LINC00601 significantly inhibited glioma tumor growth in vivo. These findings suggest that LINC00601 plays a cancer-promoting role both in vitro and in vivo.
As previously discussed, the expression of lncRNAs in gliomas differs significantly from that in normal tissues. Research has confirmed that lncRNAs are involved in various signaling pathways, influencing the proliferation, migration, invasion, and other behaviors of glioma cells, as well as the regulation of the tumor microenvironment. Consequently, lncRNAs may serve as therapeutic targets by modulating these pathways. The expression of the lncRNA solute carrier family 8 member A1 antisense RNA 1 (SLC8A1-AS1) is highly upregulated in glioma tissues. This RNA promotes cell proliferation, colony formation, migration, and invasion by activating the Wnt/β-catenin signaling pathway [38]. LINC01410 activates the Notch signaling pathway and accelerates glioma progression by sponging miR-506-3p and upregulating the NOTCH2 receptor [39]. The roles of lncRNAs in glioma mechanisms vary, and their underlying mechanisms have not yet been fully elucidated, so further in-depth studies are needed. In our study, by analyzing transcriptome data for normal U87 cells and U87 cells with LINC00601 knockdown, we discovered that LINC00601 primarily influences the JAK/STAT, NOD-like receptor, and TNF signaling pathways, along with associated biological behaviors. Our Western blot analysis also revealed that LINC00601 knockdown significantly inhibited a key node of the JAK/STAT signaling pathway. Therefore, we hypothesized that LINC00601 modulates glioma biological behavior by regulating the p-STAT3 signaling pathway. We discovered that Stattic alone can suppress the proliferation of glioma cells and that the combined application of si-LINC00601 and Stattic enhances this inhibitory effect. These findings confirmed that LINC00601 promotes glioma cell proliferation and invasion via the p-STAT3 signaling pathway.
In summary, our study revealed that LINC00601 is abnormally upregulated in gliomas and may serve as a valuable prognostic marker for glioma patients. LINC00601 plays a crucial role in glioma regulation by modulating the p-STAT3 pathway, thereby providing a new theoretical basis for glioma treatment.