British Journal of Biomedical Science最新文献

Introduction: Urbanization often correlates with reduced diversity in human gut microbiota, with notable variations observed between the gut microbiota among the Indigenous communities in rural villages and urban citizens residing in modern settings. Although research has been conducted on the gut microbiota of healthy adults in Malaysia, there has been no study characterising the gut microbiota of Sarawak's Indigenous communities to date. This study aims to fill this gap by examining the gut microbiota profile of the Sarawak Indigenous groups (specifically Orang Ulu subethnic groups Kayan and Kenyah), comparing them with semi-urbanized Selangor Indigenous communities from Peninsular Malaysia (represented by Proto Malay subtribe Temuan) and Urban communities from Kuala Lumpur.

Methods: We conducted a cross-sectional study and collected stool samples from 86 Indigenous participants from Sarawak and compared them with published data from 45 Malaysian Indigenous participants from Selangor and 18 Urban citizens living in Kuala Lumpur City. DNA was extracted from the stool samples, and subsequently, the V4 hypervariable region of the 16S rRNA gene was sequenced. The raw sequence data were analyzed using the Quantitative Insights into Microbial Ecology 2 (QIIME2) bioinformatics platform.

Results and discussion: Analysis revealed that the Sarawak Indigenous community exhibited the highest gut microbial diversity, followed by the Peninsular Indigenous and Urban groups. The Prevotella/Bacteroides (P/B) ratio revealed that the Sarawak Indigenous community showed the highest presence of Prevotella at 88.3%, while Kuala Lumpur Urban residents had a predominantly Bacteroides composition at 61%. The Selangor Indigenous community also exhibited a Prevotella-dominant profile at 75.5%. VANISH microbes (Prevotella, Faecalibacterium, and Succinivibrio) were identified as dominant genera in the Sarawak Indigenous gut microbiota, contrasting with the BIoSSUM microbe (Bacteroidaceae) found in the Kuala Lumpur cohort.

Conclusion: This study sheds light on the distinct gut microbiota composition of Sarawak's Indigenous community, which has not been previously explored. It highlights the impact of urbanization on gut microbiota composition during lifestyle transitions.

Background: The global spread of COVID-19, caused by SARS-CoV-2, has resulted in a wide spectrum of clinical manifestations, ranging from asymptomatic cases to severe complications, such as pneumonia, acute respiratory distress syndrome (ARDS), and multiple organ failure. Identifying effective biomarkers is essential for predicting disease severity and improving patient management.

Objectives: This meta-analysis aims to assess the significance of S100 proteins (S100A4, S100A8, S100A9, S100A12, S100B, S100P) and interleukins (IL) (IL-6, IL-8, IL-10, IL-17, IL-1β) in COVID-19 patients, comparing those with and without pneumonia or organ failure.

Methods: A systematic literature search was conducted on different databases, yielding 47 relevant studies published between 2020 and 2024. Data on the prevalence of IL and S100 protein levels were extracted and analyzed using pooled standardized mean differences (SMD) and heterogeneity (I²) to evaluate their associations with disease severity.

Results: IL-6 and IL-10 levels were significantly elevated in COVID-19 patients suffering from pneumonia or organ failure. IL-6 levels were notably higher in pneumonia patients compared to those without (SMD = 0.34 [95% CI: 0.17, 0.52], I² = 29%). Similarly, elevated S100B levels were observed in severe cases (SMD = 0.51 [95% CI: 0.19, 0.83], I² = 0%). While IL-10 levels showed high variability (I² = 90%), they remained consistently linked with worse outcomes.

Conclusion: This meta-analysis underscores the potential of IL-6, IL-10, and S100 proteins as important biomarkers in evaluating COVID-19 severity, offering valuable insights to help clinical management.

Purpose: The readability of public-facing vaccine-related information is an important aspect of health literacy particularly regarding vaccine uptake. The aims of this study were to analyse the readability of such written literature and to provide recommendations, for improvement.

Methods: Readability of vaccine-related information (n_total = 240) from publicly available sources (n = 20 per category), including PubMed Abstracts, Expert Review of Vaccines (ERV) and Cochrane Reviews (CR), paired plain language and scientific abstracts, public health materials, clinical trial summaries and vaccine patient information leaflets, were assessed using the Flesch Reading Ease (FRE), Flesch-Kincaid Grade Level (FKGL), SMOG and Gunning Fog readability metrics using the readability software tool readable.com.

Results: Vaccine-related information for all sources had poor readability across all readability metrics with 90.8% and 94.6% not reaching the target FKGL (≤8) (mean 12 ± 3.2 sd) and FRE (≥60) (mean 34 ± 17 sd). Plain language summaries had improved readability, but did not reach reference targets. Scientific abstract and plain language scores for the CR were FRE (mean 25 ± 7.2 sd; median 25) versus (mean 37 ± 8.6 sd; median 36) p < 0.0001), respectively and for ERV FRE the scientific abstract (mean 18 ± 11 sd; median 17) versus the plain language score (mean 26 ± 11 sd; median 28) p = 0.002), respectively, indicating an improvement in readability scores for plain language summaries but again not reaching reference targets.

Conclusion: The readability of public-facing vaccination materials is currently not optimum. The readability can be improved through the employment of readability calculators and ensuring, where possible, the use of mono-syllable words and less than fourteen words per sentence. The preparation of public-facing materials with improved readability scores will help aid in the promotion of health literacy and in turn promote vaccination uptake.

Triple-negative breast cancer (TNBC) is the most aggressive breast cancer subtype, characterized by a lack of key hormone receptors in tumor cells. As there are limited treatment options for these patients, it is crucial to understand the underlying mechanisms by which TNBC constantly evolves and evades treatments. In this regard, the pervasive nature of transcription provides a potential reservoir of transcripts, including both coding and noncoding, that TNBC leverages to sustain a proliferative advantage and support tumor growth. TNBC is affected by energy sources such as glucose, which can have a profound impact on gene expression regulation mediated by various molecules, including noncoding RNAs, at the cellular level. In this study, we demonstrate that glucose modulates the gene expression profile mediated by the microRNA-503 host gene (MIR503HG), which has been previously implicated in TNBC. To comprehensively characterize the impact of glucose on MIR503HG-regulated genes and cellular pathways, we sequenced total RNA, performed gene set enrichment analyses, and determined the relation between gene expression and patient outcomes. Analysis of gene subsets specific to various glucose environments identified clinical outcomes for breast cancer patients across different molecular subtypes. Our findings indicate that MIR503HG has potential as a diagnostic marker and may be useful in the clinical management of TNBC.

Background: Autoimmune diseases pose an increasing global health burden. The detection of antinuclear antibodies (ANA) via indirect immunofluorescence (IIF) is central to diagnosing systemic autoimmune conditions. This study aimed to assess the prevalence and distribution of ANA patterns in a Taiwanese population.

Methods: We conducted a retrospective, cross-sectional study of 8,299 patients who underwent ANA testing at Asia University Hospital between January 2021 and December 2023. ANA patterns were classified based on fluorescence staining characteristics. Demographic variables, including age and gender, were analyzed.

Results: ANA positivity was observed in 35.3% of patients. The most frequent pattern was homogeneous (33.0%), followed by speckled (24.1%). Female patients had a significantly higher positivity rate (female-to-male ratio 2.7:1), and the ≥66-year age group accounted for 34.6% of ANA-positive cases. Mixed ANA patterns were identified in 22.8% of ANA-positive patients, with homogeneous-speckled being the most common combination (27.4%).

Conclusion: This large-scale study provides valuable epidemiological data on ANA prevalence and pattern distribution in Taiwan. The predominance of homogeneous and speckled patterns, particularly among older female patients, aligns with established trends in autoimmune diseases. The high proportion of mixed ANA patterns suggests the need for further investigation into their clinical significance and diagnostic value.

Nasopharyngeal carcinoma (NPC) remains a major public health concern with a geographically skewed distribution. The disease is endemic in East Asia (particularly China), Southeast Asia (SEA) and South-Central Asia. Although China contributes the largest share of global NPC cases, several SEA countries consistently report high incidence rates. Despite this substantial burden, NPC remains a neglected disease across much of the region. This review synthesizes and appraises the available evidence on the epidemiology, incidence trends and disease burden of NPC in SEA. High-incidence hotspots persist in Indonesia, Malaysia, Singapore, Vietnam, the Philippines, and Thailand, with particularly striking rates among indigenous populations of East Malaysia. Late-stage presentation is common and survival outcomes in many SEA countries lag behind those observed in better-resourced endemic regions. Socioeconomic disparities in many SEA communities also amplify exposure to key NPC risk factors. This review outlines key region-specific challenges and identifies priority areas for coordinated health system strengthening. We emphasize the urgent need for regionally tailored strategies to mitigate the growing burden of NPC throughout SEA.

The gold standard for assessing expression of miRNAs, small molecules involved in numerous biological processes, is reverse transcription-quantitative polymerase chain reaction (RT-qPCR). The reliability of RT-qPCR analysis results largely depends on accurate data normalization and the selection of an appropriate reference gene. This study evaluated the stability of five candidate reference genes-miR-525, miR-520c, SNORD48, miR-135b, and miR-143-in human placental samples. GeNorm, NormFinder, BestKeeper, and the delta Ct-method were used to evaluate gene expression stability. The effect of reference gene selection for normalization of target miRNAs (miR-1537, miR-190b, miR-16, miR-21, and miR-146a) expression in term placental samples from smokers and non-smokers was also investigated. All statistical tools identified miR-525, miR-520c, and SNORD48 as the three most stable reference genes, except for GeNorm, which recommends the combination of the first two genes. Normalization using SNORD48 and miR-525 produced comparable results for miR-21 expression in the placental samples, both in smokers and non-smokers, whereas normalization with miR-143 yielded markedly different outcomes compared to SNORD48 and miR-525. These findings highlight the considerable impact of reference gene selection on RT-qPCR results, emphasizing the importance of careful validation to avoid misinterpretation of gene expression data.

[This corrects the article DOI: 10.3389/bjbs.2025.15455.].

Chronic inflammatory skin conditions such as psoriasis, eczema, and acne are driven by sustained inflammation, oxidative stress, and impaired tissue repair. Current treatments often lead to adverse effects with prolonged use highlighting the need for safer, targeted alternatives. Withaferin-A, a bioactive compound derived from Withania somnifera, has demonstrated potent anti-inflammatory and antioxidant properties in various disease models. This study explored the potential of Withaferin-A liposome-loaded gels for topical delivery, testing their efficacy in an inflamed skin model. Withaferin-A liposomes were prepared using the ethanol injection method and incorporated into hydroxypropyl methylcellulose (HPMC) gels. In vitro release studies using a permeable insert system were used to compare release profiles of Withaferin-A from liposomal gels. Cytotoxicity was assessed via XTT assay on human umbilical vein endothelial cells (HUVEC) and human dermal fibroblasts (HDFa). Inflammation was induced with tumour necrosis factor-alpha (TNF-α), and anti-inflammatory effects measured using enzyme-linked immunosorbent assays for interleukin-6 (IL-6) and matrix metalloproteinase-9 (MMP9). Reactive oxygen species (ROS) levels were quantified using the DCFDA assay. Cytotoxicity studies using the XTT assay on HUVEC and HDFa cells revealed good biocompatibility at lower Withaferin-A concentrations (0-1 µM), though reduced viability was observed at 5 µM. In vitro release studies revealed sustained release of Withaferin-A from liposomal gels, with significantly slower release over 6 h compared to solution at 99.53% ± 3.47% and 48.87% ± 4.51% respectively. Anti-inflammatory effects were evaluated following TNF-α-induced inflammation, with Withaferin-A loaded gels significantly reducing IL-6 secretion in a dose-dependent manner in both HUVECs (38.90 ± 5.34 to 19.15 ± 3.56 pg/mL) and HDFa cells (40.05 ± 2.23 to 10.42 ± 2.02 pg/mL). Withaferin-A treatment also reduced ROS levels and lowered MMP-9 secretion in HDFa cells from 408.80 ± 13.05 pg/mL to 195.00 ± 7.55 pg/mL, indicating potential for tissue remodelling. In summary, WA-loaded liposomal gels demonstrated effective anti-inflammatory activity and sustained drug release while maintaining biocompatibility at therapeutic concentrations. These findings support their potential as a novel strategy for managing inflammatory skin diseases by improving drug bioavailability and promoting tissue repair.

The global prevalence of type 2 diabetes mellitus (T2DM) has increased significantly over the past decade and is projected to rise further. While genetic and lifestyle factors are well-established contributors to T2DM pathogenesis, mitochondria have also gained attention as the key players. Many studies suggested that mitochondrial DNA (mtDNA) mutations and epigenetic modifications were implicated in the development and progression of T2DM. This review aimed to provide a comprehensive analysis of mtDNA mutations and epigenetic modifications associated with T2DM. Based on data from 30 published studies, a total of 117 mtDNA mutations were identified to be associated with T2DM, with D-loop region being the mutation hotspot. However, it was reported that the majority of D-loop mutations were also more frequently observed in healthy populations compared to mutations in other mtDNA regions, suggesting their potential non-pathogenic characteristic. Thus, mtDNA mutations found to be associated with T2DM but with lower occurrence in healthy populations may play a more significant role in influencing T2DM susceptibility. Regarding epigenetic modifications, mtDNA methylation was commonly reported in the D-loop and ND6 regions across seven studies. These findings suggested that these regions may play critical roles in the regulation of mitochondrial gene expression under diabetic conditions. Lastly, this review also discussed the technical challenges and limitations of detecting mtDNA mutations and methylation changes. In addition, relevant ethical considerations surrounding mitochondrial genetic research were also addressed. In conclusion, mtDNA mutations and methylation changes could potentially serve as biomarkers for the development and progression of T2DM. These molecular modifications may offer valuable insights for early diagnosis and preventive strategies. However, further research and validation are essential to establish their clinical significance and diagnostic utility.