Conectar
Systemic sclerosis (SSc) is a rare autoimmune disease characterised by skin and organ fibrosis, vasculopathy and immune dysregulation. Given the disease heterogeneity and severity, accurate prognostic and predictive markers are needed. Blood immunophenotyping by flow or mass cytometry offers a promising non-invasive approach to identify immune signatures associated with disease subtypes, complications (eg, interstitial lung disease, scleroderma renal crisis, digital ulcers) and treatment responses. However, findings remain inconsistent and lack clinical standardisation. This systematic review aims to identify cytometry-based blood immune markers associated with clinical outcomes in SSc.
A comprehensive search will be conducted on three databases: PubMed, Web of Science and Cochrane Library, from their inception to the date of the final search (21 December 2025). Data will be extracted and analysed using a predefined charting form. Studies published in English or French reporting the use of flow or mass cytometry for peripheral blood cells phenotyping in adults with SSc will be included. Comparators will include healthy controls, other autoimmune diseases, disease severity groups and treatment response subgroups. The primary outcome will be the association with the diffuse cutaneous subtype, while secondary outcomes will include overall survival and disease-specific mortality, organ involvement, progression of the disease and treatment response.
Ethical approval is not required as this review is an analysis of published scientific literature and does not involve patients. The results of this systematic literature review will be submitted for publication in a peer-reviewed journal and presented at relevant conferences.
CRD420250644594.
Background
Fatigue is a highly prevalent symptom for individuals with polycystic ovary syndrome (PCOS); however, characterization of fatigue and investigation into the gut microbiome—a pathway that may contribute to fatigue—remains inadequately explored in Black women with PCOS.
Objectives
The purpose of this cross-sectional study was to examine fatigue and its relationship to the gut microbiome in adult Black women with PCOS.
Methods
Adult Black women with a diagnosis of PCOS were recruited for this cross-sectional study. The Multidimensional Fatigue Inventory-20 (MFI-20) and the PROMIS Fatigue Short Form were used to measure fatigue. The V3/V4 region of the bacterial 16S rRNA gene was sequenced to investigate gut microbial composition. Relative abundance and diversity values were calculated.
Results
We found that Black women with PCOS experience mild to moderate levels of fatigue. An inverse relationship between fatigue scores and alpha diversity values was found for the gut microbiome. We also found distinct beta diversity profiles based on fatigue. Lastly, when controlling for hypertension and body mass index, Ruminococcus bromii, Blautia obeum, Roseburia, and HT002 were associated with three subscales of the MFI-20.
Discussion
Black women with PCOS experience mild to moderate fatigue. Clinicians should be cognizant of this population’s increased risk for fatigue to adequately address their healthcare needs. We also found that gut microbial composition was associated with fatigue in Black women with PCOS. Specifically, a higher relative abundance of certain gut bacteria involved in short-chain fatty acid production and anti-inflammatory pathways was correlated with lower fatigue levels. Future studies should further investigate the link between the gut microbiome and fatigue to determine whether this relationship is causal as better insight could inform tailored diet and exercise interventions to alter the gut microbiome and reduce fatigue.
Background
Black adults have a higher risk for heart failure (HF) than others, which may be related to higher cardiovascular risk factors and also inflammatory dietary patterns. The Western diet is associated with inflammation and contributes to HF. Trimethylamine N-oxide is a diet-linked metabolite that contributes to inflammation and is associated with higher tumor necrosis factor-alpha (TNF-α) levels, especially in HF populations. The dietary inflammatory index score measures a diet’s inflammatory potential and food’s inflammatory effects.
Objective
The purpose of this pilot study was to explore associations between the Western diet, dietary inflammatory index, trimethylamine N-oxide, relevant covariates and variables, and TNF-α in Black persons with HF.
Methods
Thirty-one Black participants (mean age = 55 years, 68% women) with HF were enrolled. Trimethylamine N-oxide and TNF-α levels were analyzed using immunoassays. A food frequency questionnaire was completed, and dietary inflammatory index scores and food groups were calculated. Analyses included correlations and I-test statistics.
Results
Mean dietary inflammatory index score was −0.38, noting an anti-inflammatory diet with slightly higher inflammatory diet scores in men compared to women. The dietary inflammatory index score showed a negative association with dietary choline but not with trimethylamine N-oxide or TNF-α. Trimethylamine N-oxide and age were positively correlated, along with the correlation for TNF-α with a moderate effect size. No relationship was found among dietary inflammatory index, TNF-α, and trimethylamine N-oxide variables.
Discussion
A greater understanding of intake of inflammatory foods and relationships with immune factors is warranted to inform intervention development. In Black adults with HF, it is important to consider the intake of inflammatory foods as increased age may affect the retention of dietary metabolites. Metabolites may also increase the levels of inflammation. Knowledge about these relationships could lead to tailored dietary interventions based on diet, age, and culture patterns. 
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