Long noncoding RNA MIRG induces osteoclastogenesis and bone resorption in osteoporosis through negative regulation of miR-1897

OBJECTIVE

To investigate the expression of long noncoding RNA (LncRNA) MIRG and its potential functions in regulating osteoclastogenesis and bone resorption function through modulating miR-1897 in bone marrow macrophages (BMMs).

MATERIALS AND METHODS

qRT-PCR was performed to detect the expressions of MIRG and its co-expression mRNA NFATc1 at different stages during osteoclastogenesis. The CCK-8 assay was performed to evaluate cell proliferation and differentiation. The correlation between miR-1897 and MIRG was detected by statistical analysis. Bioinformatics and luciferase assay were performed to explore the interaction and binding site of MIRG and miR-1897. We also cloned the mice NFATc1 3'-UTR into the luciferase reporter vector and constructed miR-1897 binding mutants to validate the inhibited regulation of miR-1897 to the expression of NFATc1.

RESULTS

Results showed that expressions of MIRG and NFATc1 were upregulated during osteoclastogenesis. qRT-PCR and CCK-8 assay showed that MIRG expression is associated with osteoclastogenesis and bone resorption. The bioinformatics prediction and luciferase assay suggested that by interacting with miR-1897, MIRG acts as a molecular sponge for the miR-1897 target NFATc1, to partly modulate the inhibitory effect of miR-1897 on NFATc1.

CONCLUSIONS

We found that lncRNA-MIRG was upregulated in osteoclasts, which could promote osteoclastogenesis and bone resorption function as a molecular sponge by modulating the inhibitory effect of miR-1897 on NFATc1.

Impact of catheter ablation on HFpEF in people with comorbid atrial fibrillation and HFpEF using invasive haemodynamic testing

Background

The impact of catheter ablation (CA) for atrial fibrillation (AF) in patients with heart failure with preserved ejection fraction (HFpEF) is unknown.

Objectives

To determine whether CA for AF reverses adverse haemodynamic changes associated with HFpEF.

Methods

Consecutive consenting patients with EF ≥50% scheduled for index CA underwent baseline exercise right heart catheterisation (exRHC), cardiac output (CO) measurement, cardiac MRI, echocardiogram, QOL questionnaires and BNP testing. HFpEF was defined by resting pulmonary capillary wedge pressure (PCWP) ≥15mmHg or peak exercise PCWP ≥25 mmHg during exRHC. Patients with HFpEF were offered follow-up exRHC ≥6 months post-CA.

Results

Of 252 patients scheduled for CA between April 2017 and Sept 2019, 131 (51.9%) qualified for inclusion, 65 (49.6%) consented to exRHC and 11 (16.9%) were excluded due to a subsequent decrease in EF (10) and uncontrolled hypertension (1). Fifty-four underwent exRHC, with 35 (65%) meeting criteria for HFpEF. Of them 26 (74.3%) who underwent CA, 20 (77%) had a follow up exRHC at 12±6 months follow-up, showing an overall decrease in peak exercise PCWP from 30.3±4.2 to 26.8±4.7 mmHg (p<0.05). Patients without arrhythmia recurrence showed significant improvements in peak exercise PCWP (29.2±3.7 to 22.9±2.0 mmHg (p<0.01). Their cardiac output increased from 10.3±3.0 to 12.1±4.0 mmHg p=0.1), and BNP decreased from (94.6±101.6 to 38.0±34.0 mmHg (p=0.06),whereas those with arrhythmia recurrence did not. Overall, 9 patients (45.0%) no longer met criteria for HFpEF.

Conclusion

There is a high prevalence of HFpEF in people referred for AF ablation. Successful CA for AF reverses the adverse haemodynamic changes associated with HFpEF

Changes in PCWP following AF ablation

Funding Acknowledgement

Type of funding source: Public grant(s) – National budget only. Main funding source(s): NHMRC, NHF, RACP

Sleep difficulties and alcohol use behaviors in adolescents and young adults: a systematic review

Background

Sleep disturbances and substance abuse are prevalent in adolescents, often associated with adverse behavioral outcomes and daytime dysfunction. While sleep problems are often seen as consequences to alcohol use, they are risk factors for alcohol misuse and related consequences. However, current evidence in adolescents and young adults (AYA) is mostly observational and is not well-documented in recent years. This systematic review aims to assess the literature surrounding sleep difficulties and their effects on subsequent alcohol misuse in AYA.

Methods

Medline, PsycINFO, and EMBASE were searched for observational studies assessing alcohol consumption, alcohol-related consequences, and self-reported sleep difficulties in AYA aged 16-25. Studies with clinical samples and randomized trials were excluded. Data on measurement tools, measures of association, and sample characteristics were recorded using a standardized form. Associations between sleep difficulties and alcohol misuse were qualitatively summarized by study type (cross-sectional and longitudinal studies). Risk of bias was assessed using CLARITY tools.

Results

Of 7706 records retrieved from databases, 24 studies met the inclusion criteria. Cross-sectional studies (n = 17) found insomnia-like symptoms (difficulties falling/staying asleep, frequent night-time awakenings) were significantly associated with alcohol use frequency and intensity (n = 16) and subsequent intoxication (n = 6). Among longitudinal studies (n = 7), persistent erratic sleep behaviors at baseline were associated with frequent binge-drinking (n = 2) and increased odds of interpersonal problems (n = 2) and risky behaviors at follow-up (n = 1).

Conclusions

The present review assesses the role of sleep difficulties in alcohol use behaviors and related consequences in AYA. Sleep inadequacies are involved in alcohol misuse, prompting investigations to clarify sleep's etiological role in alcohol use behaviors to prevent negative consequences in AYA.

Key messages

Sleep disturbances need to be investigated further as possible risk factors for incident alcohol misuse in young adults. Addressing sleep hygiene and promoting healthy sleep behaviors are important in evaluating the overarching public health issue of alcohol addiction and misuse in adolescents.

Night shift work, sleep quality and risk of endocrine-related cancer: a systematic review

Background

Cancer is a major public health concern as it is a leading cause of death worldwide. The risk of endocrine-related cancers may be associated with suboptimal sleep quality due to disruptions in circadian rhythm. However, the extent of this relationship is not clear and warrants a review summarizing recent research findings. This systematic review aims to provide an updated summary of the literature surrounding the association between night shift work, sleep quality, circadian rhythm disruption and the risk of endocrine-related cancers.

Methods

MEDLINE, EMBASE, CINAHL, and Web of Science databases have been searched for related cohort, case-control, and cross-sectional studies. The search was limited to studies published in English, after the year 2000. Non peer-reviewed literature and randomized control trials, were excluded. Reviewers will independently extract data on study characteristics, sleep quality measures, circadian rhythm measures, cancer diagnosis, and outcome measures. Risk of bias assessment will be performed using the CLARITY tools.

Results

Data synthesis is ongoing. Associations between sleep quality, night shift work, circadian disruption and risk of endocrine-related cancer will be summarized and risk estimates will be reported for four endocrine-related cancers: breast, prostate, thyroid, ovarian, and endometrial cancer. If data are available, subgroup analyses will be carried out by cancer type, study design, and age group.

Conclusions

This review qualitatively synthesizes current literature to determine the extent of the association between sleep quality, night shift work, circadian rhythm disruption and the risk of endocrine-related cancers. These findings can contribute to population-level cancer prevention efforts and aid public health promotion of healthier sleep-related behaviours.

Key messages

The relationship between sleep quality and endocrine-related cancers should be explored further in public health research due to inconclusive evidence from current literature. The findings of this project can help promote healthy sleep behaviours and population-level cancer prevention.

Sustained IFN-I stimulation impairs MAIT cell responses to bacteria by inducing IL-10 during chronic HIV-1 infection

Mucosal-associated invariant T (MAIT) cells in HIV-1-infected individuals are functionally impaired by poorly understood mechanisms. Single-cell transcriptional and surface protein analyses revealed that peripheral MAIT cells from HIV-1-infected subjects were highly activated with the up-regulation of interferon (IFN)-stimulated genes as compared to healthy individuals. Sustained IFN-α treatment suppressed MAIT cell responses to Escherichia coli by triggering high-level interleukin-10 (IL-10) production by monocytes, which subsequently inhibited the secretion of IL-12, a crucial costimulatory cytokine for MAIT cell activation. Blocking IFN-α or IL-10 receptors prevented MAIT cell dysfunction induced by HIV-1 exposure in vitro. Moreover, blocking the IL-10 receptor significantly improved anti-Mycobacterium tuberculosis responses of MAIT cells from HIV-1-infected patients. Our findings demonstrate the central role of the IFN-I/IL-10 axis in MAIT cell dysfunction during HIV-1 infection, which has implications for the development of anti-IFN-I/IL-10 strategies against bacterial coinfections in HIV-1-infected patients.

Silencing of ATPase family AAA domain-containing protein 2 inhibits migration and invasion of colorectal cancer cells

Colorectal cancer is one of the most common malignant tumors with a high rate of distant metastasis, postoperative recurrence and mortality. ATPase family AAA domain-containing protein 2 (ATAD2), a member of ATPase family, is highly expressed in various cancers, including colorectal cancer. However, whether ATAD2 plays a role in the migration and invasion of colorectal cancer cells remains unknown. In this study, we established ATAD2 knockdown in colorectal cancer cell lines by RNA interference and found that silencing of ATAD2 inhibited the migration and invasion ability of Caco-2 and SW-480 cells. Moreover, ATAD2 silencing suppressed epithelial-mesenchymal transition (EMT), and reduced the expression and enzymatic activity of matrix metalloproteinases (MMPs) in Caco-2 and SW-480 cells. In summary, our results suggest that silencing of ATAD2 inhibits migration and invasion of colorectal cancer cells by suppressing EMT and decreasing the activity of MMPs. Hence, ATAD2 could be considered as a novel molecular marker of metastatic colorectal cancer, and it may provide new insights for clinical diagnosis and treatment of colorectal cancer.

Comparison of high-flow nasal cannula versus oxygen face mask for environmental bacterial contamination in critically ill pneumonia patients: a randomized controlled crossover trial

Whereas high-flow nasal cannula use is gaining prevalence, its high gas flow raises concerns about aerosolization of infectious particles and spread of infection. This randomized controlled crossover non-inferiority trial (N = 20) evaluated the degree of environmental contamination by viable bacteria associated with the use of high-flow nasal cannula compared with conventional oxygen mask for critically ill patients with Gram-negative pneumonia. The results show that high-flow nasal cannula use was not associated with increased air or contact surface contamination by either Gram-negative bacteria or total bacteria, suggesting that additional infection control measures are not required.