Quercetin protects against LPS-induced lung injury in mice via SIRT1-mediated suppression of PKM2 nuclear accumulation.

The role of NOD-like receptor protein 3 (NLRP3)-mediated macrophages pyroptosis in acute lung injury (ALI) is well-established. Quercetin (Que) is a natural bioflavonoid compound with anti-inflammatory and antioxidative properties that reportedly inhibits the NLRP3 inflammasome in sepsis-induced organ dysfunctions such as ALI. However, the mechanism underlying the inhibitory effect of quercetin on NLRP3 activation remains unclear. In this study, we established an endotoxin-induced ALI mouse model with an in vitro LPS challenge. We demonstrated that the administration of quercetin could significantly reduce pulmonary injury and decrease the production of pro-inflammatory cytokines. Moreover, we found that quercetin could inhibit the activation of the NLRP3 inflammasome by suppressing the nuclear accumulation of PKM2 and increasing SIRT1 levels. Importantly, treatment with SRT1720 (a specific SIRT1 activator) could inhibit the nuclear accumulation of PKM2 and the activation of NLRP3. Besides, preventing PKM2 dimerization with ML265 yielded an anti-inflammatory effect, similar to findings observed for SRT1720. In addition, we found that SIRT1 silencing or inhibition by EX527 could increase NLRP3 activation and nuclear accumulation of PKM2 and override quercetin-mediated anti-inflammatory activity. These findings indicated that quercetin could downregulate NLRP3 inflammasome activation by inhibiting the nuclear accumulation of PKM2 and upregulating SIRT1 expression, expanding the treatment landscape for ARDS.

Retraction Note: Upregulation of the long non-coding RNA AFAP1-AS1 affects the proliferation, invasion and survival of tongue squamous cell carcinoma via the Wnt/ß-catenin signaling pathway.

The authors have retracted this article [1] because there are errors in Figures 4a and 4b.

Upregulation of the long non-coding RNA AFAP1-AS1 affects the proliferation, invasion and survival of tongue squamous cell carcinoma via the Wnt/ß-catenin signaling pathway.

BACKGROUND: Long non-coding RNA (lncRNA) actin filament associated protein 1 antisense RNA1 (AFAP1-AS1) is oriented in an antisense direction to the protein-coding gene AFAP1 in the opposite strand. Previous studies showed that lncRNA AFAP1-AS1 was upregulated and acted as an oncogene in a variety of tumors. However, the expression and biological functions of lncRNA AFAP1-AS1 in tongue squamous cell carcinoma (TSCC) are still unknown. METHODS: The expression level of AFAP1-AS1 was measured in 103 pairs of human TSCC tissues and corresponding adjacent normal tongue mucous tissues. The correlation between AFAP1-AS1 and the clinicopathological features was evaluated using the chi-square test. The effects of AFAP1-AS1 on TSCC cells were determined via a CCK-8 assay, clone formation assay, flow cytometry, wound healing assay and transwell assay. Furthermore, the effect of AFAP1-AS1 knockdown on the activation of the Wnt/ß-catenin signaling pathway was investigated. Finally, CAL-27 cells with AFAP1-AS1 knockdown were subcutaneously injected into nude mice to evaluate the effect of AFAP1-AS1 on tumor growth in vivo. RESULTS: In this study, we found that lncRNA AFAP1-AS1 was increased in TSCC tissues and that patients with high AFAP1-AS1 expression had a shorter overall survival. Short hairpin RNA (shRNA)-mediated AFAP1-AS1 knockdown significantly decreased the proliferation of TSCC cells. Furthermore, AFAP1-AS1 silencing partly inhibited cell migration and invasion. Inhibition of AFAP1-AS1 decreased the activity of the Wnt/ß-catenin pathway and suppressed the expression of EMT-related genes (SLUG, SNAIL1, VIM, CADN, ZEB1, ZEB2, SMAD2 and TWIST1) in TSCC cells. In addition, CAL-27 cells with AFAP1-AS1 knockdown were injected into nude mice to investigate the effect of AFAP1-AS1 on tumorigenesis in vivo. Downregulation of AFAP1-AS1 suppressed tumor growth and inhibited the expression of EMT-related genes (SLUG, SNIAL1, VIM, ZEB1, NANOG, SMAD2, NESTIN and SOX2) in vivo. CONCLUSIONS: Taken together, our findings present a road map for targeting the newly identified lncRNA AFAP1-AS1 to suppress TSCC progression, and these results elucidate a novel potential therapeutic strategy for TSCC.

[Effect of motivational interviewing combined with peer participation on obesity management in adolescents].

OBJECTIVE: To investigate the effect of motivational interviewing combined with peer participation on obesity management in adolescents. METHODS: A total of 100 adolescents with simple obesity were randomly divided into traditional management and peer participation groups (n=50 each). The traditional management group received traditional health management. The peer participation group received motivational interviewing performed by psychological consultants combined with peer participation through the entire process in addition to traditional health management. The physical exercise, dietary behavior, differences in body composition parameters, and effect of comprehensive intervention were compared between the two groups after intervention for half a year. RESULTS: After the health management for six months, the peer participation group showed better improvements in the control of energy intake, adjustment of dietary structure, adherence to moderate/high intensity exercise, and increase in lean body mass compared with the traditional management group (P<0.05). The peer participation group had a significantly higher attendance rate for guidance and counseling performed by a multidisciplinary team once a week than the traditional management group (89% vs 57%; P<0.05), as well as a significantly higher response rate to health management than the traditional management group (83% vs 43%; P<0.05). CONCLUSIONS: Motivational interviewing combined with peer participation for obesity management can improve the compliance and the effect of comprehensive intervention in losing weight in adolescents.

Up-Regulation of microRNA-183 Promotes Cell Proliferation and Invasion in Glioma By Directly Targeting NEFL.

Glioblastoma multiforme (GBM) is the most common and lethal type of primary malignant brain tumor. In recent years, increasing reports suggest that discovery of microRNAs (miRNAs) might provide a novel therapeutical target for human cancers, including GBM. The expression and roles of microRNA-183 (miR-183) has been explored in several types of human cancers, including in GBM, and plays important roles in tumor initiation and progression. However, its biological functions in GBM remain largely unknown. In this study, we demonstrated that miR-183 was significantly up-regulated in astrocytoma tissues and glioblastoma cell lines. Introduction of miR-183 mimics into U251 cells could promoted, while its antisense oligos inhibited cell proliferation and invasion. Moreover, we identified neurofilament light polypeptide (NEFL) as a novel target gene of miR-183. The expression levels of NEFL are inversely correlated with that of miR-183 in human astrocytoma clinical specimens. In addition, NEFL-siRNA could significantly attenuate the inhibitory effects of knockdown miR-183 on the proliferation and invasion of U251 cells via mTOR signaling pathway. Overall, This study revealed that miR-183 promotes glioma cell proliferation by targeting NEFL, and also demonstrated that miR-183 could be a potential target for GBM treatment.