Background: Initially, there were no data on the safety of COVID-19 vaccines in lactating women. The aim of our study was to evaluate the immune response to COVID-19 vaccinations in breastfeeding women. Methods: The study included 32 breastfeeding women who, regardless of the study, had decided to be vaccinated. Maternal serum and breast milk samples were simultaneously collected on days 8 ± 1, 22 ± 2, 29 ± 3, and 43 ± 4 after the first dose of the vaccine. The immune response was assessed by determining the presence of anti-SARS-CoV-2 IgG and IgA. Results: The breast milk IgG level was detectable (6.50 ± 6.74, median 4.7, and maximum 34.2 BAU/mL) and highly correlated to serum IgG level (r_S 0.89; p < 0.001). The breast milk ratio of IgA to the cut-off value was higher in serum IgA-positive (4.18 ± 3.26, median 2.8, and maximum >10) than in serum IgA-negative women (0.56 ± 0.37, median 0.5, and maximum 1.6; p < 0.001). The highest concentrations of serum and breast milk antibodies were observed on day 29 ± 3 with a decrease on day 43 ± 4. Conclusion: The immune response to the vaccination against SARS-CoV-2 is strongest 7 ± 3 days after the second dose of the vaccine. Lactating mothers breastfeeding their children after vaccination against SARS-CoV-2 may transfer antibodies to their infant.

The results of studies on theCD3+CD8+CD28-cells in SLE are inconsistent since several analyses describeCD3+CD8+CD28-as either immunosuppressive or cytotoxic. The aim of this study is to inquire whether the quantitative changes ofCD3+CD8+CD28-T lymphocytes subpopulation are related to the clinical status of patients with lupus nephritis. Evaluation of Foxp3 expression onCD3+CD8+CD28-cells may shed some light on functional properties of these cells. 54 adult SLE patients and 19 sex and age matched healthy volunteers were enrolled in the study. There were 15 patients in inactive (SLEDAI ≤ 5) and 39 in active (SLEDAI > 5) phase of disease. We determined absolute count ofCD3+CD8+CD28-andCD3+CD8+CD28-Foxp3+subpopulations by flow cytometry. We observed a statistically significant increase in absolute count and percentage ofCD3+CD8+CD28-in SLE patients compared to HC (p<0.001). Moreover there was significant positive correlation between increasing absolute count ofCD3+CD8+CD28-cells and disease activity measured by SLEDAI (rs = 0.281,p=0.038). Active LN patients had increased absolute count ofCD3+CD8+CD28-cells compared to HC. Positive correlation ofCD3+CD8+CD28-number with disease activity, and lack of Foxp3 expression on these cells, suggests thatCD3+CD8+CD28-lymphocytes might be responsible for an increased proinflammatory response in the exacerbation of SLE.

Successful long-term kidney allograft survival with parallel reduction of complications resulting from prolonged immunosuppressive treatment is a goal in kidney transplantation. We studied the immune changes in cell phenotypes and gene expression induced by kidney transplantation. Our goal was to find a phenotypic and/or transcriptional pattern that might be considered prognostic for the kidney transplant outcome. The analysis was performed prospectively on 36 KTx recipients sampled during the first year and followed for five years after transplantation and on 40 long-term KTx recipients (7.9±2.2 y. post-KTx). The research involved flow cytometry assessment of lymphocyte subpopulations (including Tregs and CD3⁺CD8⁺CD28⁻ lymphocytes) and gene expression analysis of immune-related genes (CD4, CD8, CTLA4, GZMB, FOXP3, IL10, IL4, ILR2A, NOTCH, PDCD1, PRF1, TGFB, and TNFA). The analysis of patterns observed over the first post-KTx year was confronted with control, pretransplant, and long-term transplant results. Treg counts at months one and three post-KTx correlated positively with the current and future allograft function. FOXP3 gene expression at month one post-KTx was also associated with long-term allograft function. The KTx-induced CD3⁺CD8⁺CD28⁻ population correlated with GZMB and PRF1 expression and suggested their cytotoxic properties. The size of the Treg population and regulatory FOXP3 gene expression in the early period after transplantation are associated with kidney transplant outcome. The outlined predictive power of the Treg population needs to be investigated further to be confirmed as one of the immune monitoring strategies that may help achieve the best long-term kidney allograft outcomes.

Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides (AAV) are a group of necrotizing multiorgan autoimmune vasculitides that predominantly affect small blood vessels and are associated with the presence of ANCAs. The aim was to assess regulatory and effector cell populations accompanied by the suPAR biomarker level and link the so-defined immune state to the AAV disease activity. The research involved a multicomponent description of an immune state encompassing a range of B and T cell subsets such as transitional/regulatory B cells (CD19⁺CD24⁺⁺CD38⁺⁺), naïve B cells (CD19⁺CD24^INTCD38^INT), Th17 cells, T regulatory cells (CD4⁺CD25⁺FoxP3⁺) and cytotoxic CD4⁺CD28⁻ cells by flow cytometry. The suPAR plasma level was measured by ELISA. The results indicate that AAV is associated with an increased suPAR plasma level and immune fingerprint characterized by an expansion of Th17 cells and T cells lacking the costimulatory molecule CD28, accompanied by a decrease of regulatory populations (Tregs and transitional B cells) and NK cells. Decreased numbers of regulatory T cells and transitional B cells were shown to be linked to activation of the AAV disease while the increased suPAR plasma level—to AAV-related deterioration of kidney function. The observed immune fingerprint might be a reflection of peripheral tolerance failure responsible for development and progression of ANCA-associated vasculitides.

Introduction: Obesity, which is a serious problem in children, has a negative impact on many organs, including kidneys, and obesity-related glomerulopathy (ORG) is an increasingly common cause of ESKD (end-stage kidney disease) in adults. Early-detected and -treated glomerular lesions are reversible, so it is important to find a useful marker of early damage. The study aimed to evaluate the albumin-to-creatinine ratio (ACR), urinary alpha-1-acid glycoprotein (α1-AGP), and mRNA of podocyte-specific proteins as indicators of glomerular injury and their relationship with the degree of obesity and metabolic disorders. Materials and Methods: A total of 125 obese children and 33 healthy peers were enrolled. Patients were divided into two groups, depending on SDS BMI values. ACR, α1-AGP, mRNA expression of nephrin, synaptopodin, podocin, and C2AP protein in urine sediment were measured. Results: ACR values did not differ between groups and were within the normal range. α1-AGP and mRNA expression were significantly higher in obese children compared with controls. mRNA expression of the remaining podocyte proteins was similar in both groups. No significant differences concerning all examined parameters were found depending on the degree of obesity. There was a positive significant correlation between α1-AGP and ACR. Conclusions: Increased α1-AGP before the onset of albuminuria suggests its usefulness as a biomarker of early glomerular damage in obese children. An increased podocin mRNA expression also indicates podocyte damage and may be linked to ORG development. The lack of increase in expression of other podocyte proteins suggests that podocin mRNA may be a more specific and sensitive biomarker. The degree of obesity has no impact on the tested parameters, but further studies are needed to confirm it.

Purpose To prospectively evaluate prognostic capabilities of non-muscle invasive bladder cancer (NMIBC) biomarkers for predicting disease recurrence or progression after radical TURB (transurethral resection of bladder tumor). Methods Evaluated biomarkers included blood: plasminogen activator inhibitor 1 (PAI-1), soluble urokinase plasminogen activator receptor (suPAR), interleukin 8 (IL-8) and urine: IL-8, vascular endothelial growth factor (VEGF) and apolipoprotein E (APOE). Blood and urine samples acquired before TURB for NMIBC from 223 subjects were analysed. The primary outcome was tumor recurrence or progression. Results After 3 months follow-up with cystoscopy or TURB– 92 patients were tumor free (Group 1). In 131 subjects (Group 2) a recurrence of NMIBC (n = 120) or progression to muscle invasive bladder cancer (MIBC) (n = 11) has been observed. No major clinical differences between these two groups were spotted. The group 2 has presented with significantly higher concentrations of blood IL-8 and suPAR as well as urine VEGF and APOE. The serum IL-8 and urinary VEGF showed the highest prognostic abilities with AUROC of 0.611 (95% CI: 0.534–0.687, p = 0.0044) and 0.632 (95% CI: 0.557–0.707, p = 0.0006), respectively. Multivariable machine learning models which included all investigated biomarkers and European Organisation for Research and Treatment of Cancer (EORTC) risk scores have allowed to discriminate the two patient entities with AUROC of 0.84 (95% CI: 0.73–0.95, p < 0.0001). Conclusions The assessed biomarkers alone have shown unsatisfactory prognostic capabilities to be used for prognostication of outcomes after TURB. More complex multivariable prediction models may improve their prognostic performance. Trial registration The study was retrospectively registered at clinicaltrails.gov with National Clinical Trial number (NCT): NCT06235853.