Preliminary clinical study of personalized neoantigen vaccine therapy for microsatellite stability (MSS)-advanced colorectal cancer.

Immunotherapy based on immune checkpoint inhibitors (ICIs) has provided revolutionary results in treating various cancers. However, its efficacy in colorectal cancer (CRC), especially in microsatellite stability-CRC, is limited. This study aimed to observe the efficacy of personalized neoantigen vaccine in treating MSS-CRC patients with recurrence or metastasis after surgery and chemotherapy. Candidate neoantigens were analyzed from whole-exome and RNA sequencing of tumor tissues. The safety and immune response were assessed through adverse events and ELISpot. The clinical response was evaluated by progression-free survival (PFS), imaging examination, clinical tumor marker detection, circulating tumor DNA (ctDNA) sequencing. Changes in health-related quality of life were measured by the FACT-C scale. A total of six MSS-CRC patients with recurrence or metastasis after surgery and chemotherapy were administered with personalized neoantigen vaccines. Neoantigen-specific immune response was observed in 66.67% of the vaccinated patients. Four patients remained progression-free up to the completion of clinical trial. They also had a significantly longer progression-free survival time than the other two patients without neoantigen-specific immune response (19 vs. 11 months). Changes in health-related quality of life improved for almost all patients after the vaccine treatment. Our results shown that personalized neoantigen vaccine therapy is likely to be a safe, feasible and effective strategy for MSS-CRC patients with postoperative recurrence or metastasis.

Cryptotanshinone inhibits prostaglandin E2 production and COX-2 expression via suppression of TLR4/NF-κB signaling pathway in LPS-stimulated Caco-2 cells.

Crytotanshinone (CTN), one of the main constituents of Salvia miltiorrhiza, has been known to exhibit antioxdative, anti-inflammatory and other important therapeutic activities. The aim of this study was to evaluate the effect of CTN on prostaglandin E2 and COX-2 production in LPS-stimulated human intestinal cells (Caco-2 cells). Caco-2 cells were stimulated with LPS in the presence or absence of CTN. The production of prostaglandin E2 (PGE2) was detected by ELISA. The expression of COX-2 was detected by qRT-PCR and Western blot. The extent of phosphorylation of IκB-α, NF-κB p65 and the expression of TLR4 were detected by western blot. The results showed that CTN dose-dependently inhibited the expression of COX-2 both in mRNA and protein levels, resulting in a decreased production of PGE2. We also found that CTN suppressed LPS-induced NF-κB activation and IκBα degradation. Furthermore, CTN inhibited the expression of TLR4 up-regulated by LPS. These results suggest that CTN exerts an anti-inflammatory property by inhibiting TLR4/NF-κB signaling pathway and the release of pro-inflammatory mediators. These findings suggest that CTN may be a therapeutic agent against intestinal inflammatory diseases.

Downregulation of long non-coding RNA AIRN promotes mitophagy in alcoholic fatty hepatocytes by promoting ubiquitination of mTOR.

Long non-coding RNAs (lncRNAs) are crucial in chronic liver diseases, but the specific molecular mechanism of lncRNAs in alcoholic fatty liver (AFL) remains unclear. In this study, we investigated the in-depth regulatory mechanism of mTOR affected by AIRN non-protein coding RNA (lncRNA-AIRN) in the development of AFL. LncRNA-AIRN was highly expressed in the liver tissues of AFL C57BL/6mice and oleic acid+alcohol (O+A)treated AML-12cells by using quantitative real-timePCR. RNA pull-down and RNA immunoprecipitation experiments demonstrated that there was an interaction between lncRNA-AIRN and mTOR, and that interference with lncRNA-AIRN could promote the mTOR protein level. Results ofcycloheximide-chase assay showed that the proteinlevel of mTOR was decreased with the treatment time after the knockdown of lncRNA-AIRN. Furthermore, the knockdown of lncRNA-AIRN reducedmTOR protein level by promoting the E3 ubiquitin ligase FBXW7-mediated ubiquitination.The lncRNA-AIRN/mTORaxis was involved in the regulation of the mitophagy of O+A treated hepatocytes, which was confirmed by the cell transfection and the MTT assay.SPSS 16.0 was used for analyzing data. The difference between the two groups was analyzed by performing Student's t-test, and ANOVA was used to analyze the difference when more than two groups. P values < 0.05 were considered to be significantly different.Our findings demonstrated that the knockdown of lncRNA-AIRN influencedmitophagy in AFL by promoting mTOR ubiquitination.

[The relationship of methylenetetrahydrofolate reductase G1793A gene polymorphism, hyperhomocysteinaemia and ulcerative colitis].

OBJECTIVES: The present study aimed to investigate the associations between genetic polymorphism of methylenetetrahydrofolate reductase (MTHFR) G1793A, plasma homocysteine (Hcy) levels, vitamin status and ulcerative colitis (UC) in a cohort of patients in Hubei Han nationality. METHODS: Two hundred and ninety-nine UC patients and 764 age- and sex-matched healthy controls were recruited in this study. Polymorphism of MTHFR G1793A was examined using a PCR-RELP method. Plasma levels of Hcy, folate and vitamin B12 were determined by enzymatic cycling assay and corpuscle immune chemiluminescence assay, respectively. RESULTS: Both variant allele and genotype frequencies in MTHFR G1793A gene were significantly higher in the UC patients compared to the controls (22.24% vs 14.20%, P < 0.001; 42.81% vs 26.97%, P<0.001, respectively). Plasma Hcy levels were increased in UC patients compared to the controls [(20.67 ± 6.42) mmol/L vs (13.21±5.11) mmol/L, P<0.001] while folate and vitamin B12 concentrations were significantly decreased [(11.37±6.34) nmol/L vs (14.89±7.21) nmol/L, P<0.001; (324.15±127.53) pmol/L vs (421.54±128.45) pmol/L, P<0.001, respectively]. Furthermore, hyperhomocysteinaemia (HHcy) and folate deficiency were also more prevalent in the UC patients (32.44% vs 25.78%, P=0.029; 23.41% vs 17.01%, P=0.016, respectively). CONCLUSIONS: Genetic polymorphism of MTHFR G1793A was strongly associated with UC. HHcy, folate deficiency and low vitamin B12 concentration were common phenomena in the UC patients of Hubei Han nationality. Our findings demonstrate that the genes related to Hcy metabolism may play an important role in the pathogenesis of UC.