Introduction

Intragastric balloon (IGB) is a minimally invasive intervention used for obese patients who do not achieve adequate weight loss with standard medical therapy (SMT), which includes lifestyle interventions with or without pharmacological treatment. It is also an option for individuals who do not meet the criteria for bariatric surgery or choose not to undergo it. Despite its growing use, there is little data on the short and long-term effectiveness of IGB compared to SMT in randomized controlled trials (RCTs).

Aims & Methods

This systematic review and meta-analysis aimed to compare the efficacy of IGB therapy for at least six months versus SMT in the treatment of obesity, assessing outcomes at 6, 9, and 12 months. A comprehensive literature search was conducted in the MEDLINE, EMBASE, and Cochrane Library databases. The primary outcome was the percentage of excess weight loss (%EWL), while secondary outcomes included absolute weight loss (AWL), percentage of total weight loss (%TWL), and body mass index reduction (BMIR). We calculated mean differences (MD) with 95% confidence intervals (CI) for continuous outcomes. Meta-regression was performed using baseline body mass index (BMI) as a covariate, and subgroup analyses were conducted based on IGB type, baseline BMI, and pharmacological therapy in the SMT group.

Results

A total of 15 RCTs, including 1,961 patients, were included. Compared to SMT, IGB therapy resulted in significantly greater %EWL at 6 months (MD 16.80%; 95% CI [9.22%; 24.38%]), 9 months (MD 14.36%; 95% CI [7.67%; 21.04%]), and 12 months (MD 13.10%; 95% CI [10.43%; 15.77%]). IGB was also superior in AWL, %TWL, and BMIR across all time points (Table 1). Subgroup analyses revealed that results remained consistent regardless of pharmacological therapy use in the SMT group (p=0.77). The Orbera balloon showed superior %TWL at 6 months (p<0.01) and AWL at 6 months (test for subgroup differences with p=0.01), while the Spatz3 balloon demonstrated better %TWL at 9 months (p<0.01). Studies with a baseline BMI >40 kg/m² had significantly greater %TWL at 6 months (p=0.04) and AWL at 6 months (p<0.01) than those with BMI ≤40 kg/m². Meta-regression analysis indicated that higher baseline BMI was associated with greater AWL and BMIR at 6 months.

Conclusion

IGB therapy was significantly more effective than SMT, even when pharmacological therapy was included, leading to superior weight loss outcomes at 6, 9, and 12 months.

Table 1. Summary of findings.

References

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Introduction

Gastric cancer is one of the most common malignant tumors with high morbidity, and Helicobacter pylori (H. pylori) infection is the predominant risk factor for gastric cancer. In our previous study, we performed proteomic analysis and compared the differentially expressed RNA-binding proteins between the two groups after H. pylori infection, which led us to focus on Insulin-like growth factor-2 mRNA-binding protein1 (IGF2BP1). As an RNA-binding protein, IGF2BP1 plays an increasingly important role in tumorigenesis, but its mechanism in the pathogenesis of H. pylori infection remains unclear. Therefore, we investigated the role of IGF2BP1 in response to H. pylori infection and gastric tumorigenesis in this study.

Aims & Methods

In vitro cell culture, patient-derived organoids, and in vivo mouse models were used. RT-qPCR and Western blot were used to verify the phenomena in cellular level, mouse model and patient samples. Bioinformatics analyses of local and public databases were applied to analyze IGF2BP1 expression, signaling pathways, and clinical significance. The IGF2BP1 over-expressed stable cell line and stable knockout cell line were constructed by lentiviral infection. Cell proliferation was verified by CCK8 and cell apoptosis assay and the reactive oxygen species (ROS) production was detected by DCFH-DA probe assay. Further mechanisms were explored by RNA Immunoprecipitation (RIP) and RNA turnover experiments. Validated IGF2BP1 as a potential therapeutic target was accomplished by patient-derived organoids culture and xenograft in nude mice with intratumoral injection of BTYNB, a small molecule compound, which was identified as a potent and selective inhibitor of IMP1 binding to c-Myc mRNA.

Results

We found that the expression of IGF2BP1 was significantly up-regulated when H. pylori infected in cell lines, mouse model and patient samples. Cell proliferation induced by IGF2BP1 up-regulated was verified by CCK8 and cell apoptosis assay and ROS production was significantly inhibited after overexpression of IGF2BP1 and up-regulated after knockout of IGF2BP1, suggesting that IGF2BP1 promoted cell proliferation and inhibit ROS production and thus facilitated the survival of malignant cells. Further, transcriptome sequencing revealed that the relevant differentially expressed genes were mainly enriched in the endoplasmic reticulum stress-related pathway, suggesting that IGF2BP1 might influence the occurrence of oxidative stress via ferroptosis. Then we found that IGF2BP1 could inhibit ferroptosis by up-regulating the SLC7A11, which is an important molecule of ferroptosis pathway. Mechanismly, IGF2BP1 acted as an RNA m6A methylation reader to recognize and bind to SLC7A11 mRNA, and promoted the expression level of SLC7A11 after increasing its mRNA stability thereby inhibiting ferroptosis. Taken together, IGF2BP1 could inhibit ferroptosis and promote cell proliferation, thus promoting the development of gastritis and gastric cancer associated with H. pylori infection. Intratumoral injection of BTYNB into xenograft in nude mice significantly inhibited the proliferation of tumors with high IGF2BP1 expression, which indicated that IGF2BP1 was a potential therapeutic target in gastric cancer.The same result was likewise demonstrated in patient-derived organoids culture system.
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Conclusion

Our results clarified the important role of IGF2BP1 in gastric mucosal diseases associated with H. pylori infection, and identified IGF2BP1 was a potential therapeutic target in gastric mucosal diseases through cellular experiments, mouse model and clinical patient samples.

Introduction

Gastric cancer is a malignant tumor that seriously endangers human physical and mental health worldwide. H. pylori infection is considered to be the major cause of gastric cancer. Differences in clinical outcomes after H. pylori infection may be related to bacterial virulence. Thioredoxin-1 (Trx1) and Arginase (RocF) expressed by H. pylori were found to be closely related to its pathogenicity and promoted gastric cancer pathogenesis in our previous study.

Aims & Methods

To explore whether Helicobacter pylori Trx1 and RocF can be used as a marker of highly pathogenic Helicobacter pylori and its pathogenesis. We investigated the expression level of H. pylori trx1 and H. pylori rocF in human gastric antrum tissues using reverse transcription and quantitative real-time PCR (RT-qPCR) and clarified the clinical application value of trx1 and rocF for screening highly pathogenic H. pylori. The pathogenic mechanism of Trx1 were further explored by RNA-seq of GES-1 cells co-cultured with trx1 high or low expressing H. pylori. Differentially expressed genes and signaling pathways were validated by RT-qPCR, Enzyme-linked immunosorbent assay (ELISA), western blot, immunohistochemistry and immunofluorescence. We also assessed the adherence of trx1 high and low expressing H. pylori to GES-1 cells.

Results

We found that H. pylori trx1 and H. pylori rocF were more significantly expressed in the gastric cancer and peptic ulcer group than that in the gastritis group and the parallel diagnosis of H. pylori trx1 and H. pylori rocF had high sensitivity. Trx1 high expressing H. pylori had stronger adhesion ability to GES-1 cells and upregulated the interleukin (IL) 23A/Nuclear factor κappaB (NF-κB)/IL17A, IL6,IL8 pathway.

Conclusion

In conclusion, H. pylori trx1 and H. pylori rocF can be used in clinical screening of highly pathogenic H. pylori and predicting the outcome of H. pylori infection. trx1 high expressing H. pylori enhances the adhesion capacity and promotes the development of gastric diseases by upregulating the NF-κB signaling pathway and related inflammatory cytokines.

References

1. Sung H.,Ferlay J.,Siegel R.L.,Laversanne M.,Soerjomataram I.,Jemal A., et al. (2021) Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries. CA Cancer J Clin.71, 209-249.
2. Schottker B., Adamu M.A., Weck M.N. and Brenner H. (2012) Helicobacter pylori infection is strongly associated with gastric and duodenal ulcers in a large prospective study. Clin Gastroenterol Hepatol.10, 487-493.

Disclosure

The authors declare that there is no competing interests associated with the manuscript.