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Clinica chimica acta
Elsevier
Clinica chimica acta

Elsevier

0009-8981

Clinica chimica acta/Journal Clinica chimica actaSCIISTPIC
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    A review: Pathological and molecular biological study on atherosclerosis

    Jing L.Shu-xu D.Yong-xin R.
    6页
    查看更多>>摘要:? 2022 Elsevier B.V.Atherosclerosis is a disease in which the arterial intima thickens and transforms into a sclerotic plaque, interfering with normal blood flow and potentially leading to stroke or death. It is divided into three stages: the pre-stage, which is characterized by diffuse intimal thickenings (DITs) and fatty streaks, the early atherosclerotic stage, which is characterized by pathological intimal thickening (PIT), and the late stage, which is characterized by fibroatheromas transformed from PIT. Each stage of atherosclerosis is distinguished by distinct morphological changes, biological changes, and the expression of immune markers at various levels. This review summarizes discoveries and achievements in microanatomy, ultrastructure, immunohistochemical staining, and molecular biology in the literature on atherosclerosis. Based on our research, we have emphasized common histological changes and pathological mechanisms of atherosclerosis in this review.

    Alzheimer's disease diagnosis based on detection of autoantibodies against Aβ using Aβ40 peptide in liposomes

    Monteiro J.C.Yokomichi A.L.Y.de Carvalho Bovolato A.L.Schelp A.O....
    7页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: Alzheimer's disease (AD) is the most common form of dementia and affect more than 50 million people worldwide. Thus, there is a high demand by non-invasive methods for an early diagnosis. This work explores the AD diagnostic using the amyloid beta 1–40 (Aβ40) peptide encapsulated into dipalmitoyl phosphatidyl glycerol (DPPG) liposomes and immobilized on polyethylene imine previously deposited on screen-printed carbon electrodes to detect autoantibodies against Aβ40, a potential biomarker found in plasma samples. Methods: The immunosensor assembly was accompanied by atomic force microscopy (AFM) images that showed globular aggregates from 20 to 200 nm corresponding liposomes and by cyclic voltammetry (CV) through increase of the voltammogram area each material deposited. After building the immunosensor, when it was exposed to antibody anti-Aβ40, there was an increase in film roughness of approximately 9 nm, indicating the formation of the immunocomplex. Results: In the detection by CV, the presence of specific antibody, in the range of 0.1 to 10 μg/ml, resulted in an increase in the voltammograms area and current in 0.45 V reaching 3.2 μA.V and 5.7 μA, respectively, in comparison with the control system, which remained almost unchanged from 0.1 μg/ml. In patient samples, both cerebrospinal fluid (CSF) and plasma, was possible separated among positive and negative samples for AD using CV profile and area, with a difference of 0.1 μA.V from the upper error bar of healthy samples for CSF sample and 0.6 μA.V for plasma sample. Conclusions: These results showed the feasibility of the method employed for the non-invasive diagnostic of Alzheimer's disease detecting natural autoantibodies that circulate in plasma through a simple and easy-to-interpret method.

    Evaluation of a batched-extraction method for measurement of sirolimus, tacrolimus, and cyclosporine on the Architect i2000SR

    Di Meo A.Youkhana S.Khalifeh S.Brinc D....
    7页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: Manual extraction of immunosuppressants is required before measurement on the Architect immunoassay analyzer. The individual extraction of samples places clinical laboratory staff at risk for ergonomic injury. We evaluated the analytical performance of a batched extraction method for measuring sirolimus, tacrolimus, and cyclosporine using the Architect i2000SR. Methods: Residual whole blood samples from patients receiving immunosuppressant therapy were used for evaluation. The analytical evaluation included imprecision, linearity, and method comparison. Technologist-to-technologist variation was also assessed. Results: Total imprecision ranged from 2.58 to 3.13% for sirolimus, 2.70–3.77% for tacrolimus, and 7.82–12.41% for cyclosporine. Linearity was verified from 0.44–19.49 μg/l for sirolimus, 0.05–26.15 μg/l for tacrolimus, and 0.15–991.55 μg/l for cyclosporine. Deming regression analysis showed slope and intercept were not significant for either technologist-to-technologist comparison or for batched vs. individual processing comparison. Bland-Altman analysis of individual vs. batched processing revealed a mean bias of 1.29% (LLOA: ?14.63%, ULOA: 17.21%) for sirolimus, 2.07% (LLOA: ?10.87%, ULOA: 15%) for tacrolimus, and ?1.56% (LLOA: ?20.05%, ULOA: 16.94%) for cyclosporine. The values were not significantly different from the bias and LLOAs observed for technologist-to-technologist comparison. Conclusions: The imprecision and linearity of batched methods met analytical goals. The batched method also correlated well with the individual extraction methods. The ULOA and LLOA for all drugs tested exceeded a TAE or ± 15%. However, similar range of differences was observed between technologists, suggesting that batch processing did not increase or reduce variability due to manual preparation steps.

    Molecular diagnostics of SARS-CoV-2: Findings of an international survey

    Vacaflores Salinas A.Ashavaid T.Payne D.A.Linder M.W....
    6页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: In the current COVID-19 pandemic, early and rapid diagnosis of potentially infected and contagious individuals enables containment of the disease through quarantine and contact tracing. The rapid global expansion of these diagnostic testing services raises questions concerning the current state of the art with regard to standardization of testing and quality assessment practices. The aim of this study was to provide a global overview of the test methods, laboratory procedures and quality assessment practices used for SARS-CoV-2 diagnostics. Methods: The Molecular Diagnostics Committee of the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC C-MD) initiated a survey among international laboratories performing molecular genetic detection of SARS-CoV-2. Questions on quality assurance, variant testing, sequencing and the transmission of findings were included in the survey. Results: A total of 273 laboratories from 49 countries participated in the survey. The majority of the participating laboratories (92.2%) use reverse transcriptase polymerase chain reaction (RT-PCR). The majority of participating laboratories do not conduct testing to identify SARS CoV-2 variants. Participation in external quality assessment programs was reported by the majority of laboratories, however, 33.2% of the laboratories reported not participating in external quality assurance programmes. Conclusions: Based on the survey, molecular diagnostic methods for SARS-CoV-2 detection are clearly not standardized across different countries and laboratories. The survey found an array of responses in regard to sample preparation, collection, processing and reporting of results. This work suggests quality assurance is insufficiently performed by diagnostic laboratories conducting SARS-CoV-2 testing.

    Association between liver and chronic kidney disease on hemoglobin A1c concentrations

    Pratt G.W.Bi C.Kroll M.H.Rao L.V....
    5页
    查看更多>>摘要:? 2022 Elsevier B.V.Introduction: HbA1c is the gold standard for measuring long-range glycemic control in patients with type-2 diabetes mellitus. Conditions such as CKD or LD can lead to spurious HbA1c test results. There is conflicting literature about the relationship between HbA1c, LD, and CKD. Methods: Results for HbA1c concentrations were retrieved from 2015- to 2019. We evaluated over 2,500 test results with LD and 20,000 results with CKD compared to over 21,000 test results without LD, iron de?ciency anemia, or CKD. Patients were classi?ed as having LD if they had high ALT and AST concentrations and classified as CKD, if they have abnormal serum creatinine and BUN or low eGFR based on age-based reference ranges. Kruskal–Wallis statistical analyses method was used to test whether the two populations followed the same distribution and signi?cance. Results: The median HbA1c concentration was 5.8% (40 mmol/l) among LD classified patients in both males and females vs. 5.4% (36 mmol/l) (P < 0.001) for females and 5.6% (38 mmol/l) (P < 0.001) for males without LD. A significant difference in median HbA1c concentrations were also observed between CKD samples (female: 5.7% (39 mmol/l), male: 6.0% (42 mmol/l)) and non-CKD samples (female: 5.4% (36 mmol/l), male: 5.6% (38 mmol/l)) (P < 0.001). Depending on the population's CKD stage, median concentrations of % HbA1c are increased from stage-1 through stage-4 and fell in Stage-5. Conclusion: Patients with high AST and ALT concentrations or CKD can have increased HbA1c concentrations compared to normal patients. When using HbA1c concentrations to monitor diabetes, healthcare professionals should consider LD or CKD status before making any therapeutic decisions.

    Associations between polycythemia and cardiometabolic risk factors in middle-aged men

    Wakabayashi I.
    6页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: Polycythemia increases blood viscosity and causes thrombogenesis in cardiovascular disease. However, relationships between polycythemia and cardiometabolic risk factors in a general population remain to be determined. Methods: Subjects were middle-aged Japanese men (n = 11261) receiving annual health checkup examinations. Relationships of polycythemia, defined as hemoglobin concentrations of 16.5 g/dl or higher, with cardiometabolic risk factors, including obesity, hypertension, dyslipidemia and diabetes, were investigated. Results: Both in univariable analysis and multivariable analysis with adjustment for age, histories of smoking, alcohol drinking and regular exercise, and medication therapy for hypertension, dyslipidemia or diabetes, waist-to-height ratio, systolic and diastolic blood pressure, triglycerides, LDL cholesterol, cardiometabolic index (CMI) and hemoglobin A1c were significantly higher and HDL cholesterol was significantly lower in the polycythemic group than in the non-polycythemic group. The above associations between polycythemia and cardiovascular risk factors were also found in the sub-analysis for nonsmokers (n = 4937). The odds ratios (ORs) of the polycythemic vs. non-polycythemic groups for high CMI and metabolic syndrome (MS) were significantly high when compared with the reference level in the multivariable analysis (OR with 95% confidence interval: high CMI, 2.18 [1.91 ~ 2.50]; MS, 2.39 [2.02 ~ 2.85]). Conclusion: Polycythemia showed smoking-independent associations with cardiometabolic risk factors including visceral obesity, hypertension, dyslipidemia, diabetes and metabolic syndrome. Thus, polycythemia is a potential discriminator of cardiovascular risk in the general population.

    A deep learning-based system for assessment of serum quality using sample images

    Yang C.Li D.Sun D.Zhang S....
    7页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: Serum quality is an important factor in the pre-analytical phase of laboratory analysis. Visual inspection of serum quality (including recognition of hemolysis, icterus, and lipemia) is widely used in clinical laboratories but is time-consuming, subjective, and prone to errors. Methods: Deep learning models were trained using a dataset of 16,427 centrifuged blood images with known serum indices values (including hemolytic index, icteric index, and lipemic index) and their performance was evaluated by five-fold cross-validation. Models were developed for recognizing qualified, unqualified and image-interfered samples, predicting serum indices values, and finally composed into a deep learning-based system for the automatic assessment of serum quality. Results: The area under the receiver operating characteristic curve (AUC) of the developed model for recognizing qualified, unqualified and image-interfered samples was 0.987, 0.983, and 0.999 respectively. As for subclassification of hemolysis, icterus, and lipemia, the AUCs were 0.989, 0.996, and 0.993. For serum indices and total bilirubin predictions, the Pearson's correlation coefficients (PCCs) of the developed model were 0.840, 0.963, 0.854, and 0.953 respectively. Moreover, 30.8% of serum indices tests were deemed unnecessary due to the preliminary application of the deep learning-based system. Conclusions: The deep learning-based system is suitable for the assessment of serum quality and holds the potential to be used as an accurate, efficient, and rarely interfered solution in clinical laboratories.

    IgG4-IgE complex in patients with IgG4-related disease

    Nakano K.Sugita J.Seimiya M.Yasuda K....
    4页
    查看更多>>摘要:? 2022 Elsevier B.V.Background: IgG4-related disease (IgG4-RD) is an immune-mediated fibroinflammatory disease characterized by high IgE levels; however, the physiological significance of elevated IgE levels in patients with IgG4-RD is unclear. Previously, we reported the formation of IgG4-IgE complex in IgG4-RD patients with elevated IgE levels. In this study, we examined the frequency of this complex formation and its relationship with the clinical features in IgG4-RD patients. Methods: The IgG4-IgE complex was evaluated in 33 and 17 patients with and without IgG4-RD, respectively. The IgG4-IgE complex was evaluated by performing the immunoadsorption of IgG4 using anti-IgG4 antibody-conjugated matrices. Results: The frequency of IgG4-IgE complex formation in patients with IgG4-RD was significantly higher than that in those without IgG4-RD (21.2% vs. 0%). No significant differences were observed between the groups in terms of clinical characteristics and laboratory data. However, the IgG4-IgE complex-positive group had a significantly higher frequency of pancreatic lesions (85.7% vs. 42.3%) and a significantly lower rate of retroperitoneal fiber/periarterial lesions (0% vs. 38.5%) than the IgG4-IgE complex-negative group. Conclusion: The IgG4-IgE complex was found only in patients with IgG4-RD which may provide some clues to the pathogenesis and etiology of IgG4-RD.

    Immune regulation in polycystic ovary syndrome

    Luan Y.-Y.Zhang L.Peng Y.-Q.Li Y.-Y....
    8页
    查看更多>>摘要:? 2022 The AuthorsA polycystic ovarian syndrome (PCOS) is the most common endocrine disorder affecting females. Furthermore, it is a heterogeneous disease with a variety of etiologies and outcomes. Patients frequently complain about infertility, irregular menstruation, acne, seborrheic dermatitis, hirsutism, and obesity. PCOS can be caused by hypothalamic-pituitary-ovarian axis dysfunction, heredity, or metabolic abnormalities. PCOS is characterized by chronic low-level inflammation, which includes an imbalance in pro-inflammatory factor secretion, endothelial cell dysfunction, and leukocytosis. PCOS is also distinguished by hormonal and immune dysregulation. During PCOS, immune cells and immune regulatory molecules play critical roles in maintaining metabolic homeostasis and regulating immune responses. Because of oligo/anovulation, patients with PCOS have low progesterone levels. Therefore, low progesterone levels in PCOS overstimulate the immune system, causing it to produce more estrogen, which leads to a variety of autoantibodies. This review aims to summarize the immune regulation involved in the pathogenesis of PCOS and pave the way for the development of better PCOS treatment options in the near future.

    Misidentification of epithelial renal tubular cells as decoy cells in the urinary sediment of a kidney transplant recipient: the importance of adequate clinical information

    Malvica S.Mateus C.Garigali G.Castellano G....
    4页
    查看更多>>摘要:? 2022 Elsevier B.V.The examination of the urinary sediment of a kidney transplant recipient, carried out in blind conditions, showed the presence of a moderate number of cells which were identified as decoy cells. Most frequently these cells are a marker of BK polyomavirus reactivation, which can lead to BK virus nephropathy and graft loss. However, the patient's clinical history, the absence of BK viremia, and the renal biopsy findings excluded this condition. The careful examination of the renal biopsy demonstrated a severe tubular damage with cells resembling those identified in the urine as decoy cells. This paper is the first which demonstrates that damaged renal tubular epithelial cells can be misidentified as decoy cells. In addition, it highlights the importance of supplying adequate clinical information for a correct urinary sediment examination.