Phenotypic amikacin resistance may not indicate poor response to amikacin in Mycobacterium avium complex pulmonary disease

When using amikacin to treat Mycobacterium avium complex pulmonary disease (MAC-PD), a minimum inhibitory concentration resistance breakpoint of ≥64 mcg/mL is recommended. We explored whether amikacin resistance characterized by phenotypic drug susceptibility testing was associated with clinical outcomes or mutational resistance in a retrospective cohort of patients with MAC-PD. Despite little aminoglycoside exposure, amikacin resistance was common in our MAC-PD patients but was not associated with worse outcomes or rrs gene mutations.

External Validation of the BACES Score in Canadian Patients With Nontuberculous Mycobacterial Pulmonary Disease

BACKGROUND

The clinical course of nontuberculous mycobacterial pulmonary disease (NTM-PD) can be variable and difficult to predict. Recently, the BACES score was developed as a tool to predict all-cause mortality in patients with NTM-PD. This score is calculated based on five patient characteristics (BMI, age, cavity, erythrocyte sedimentation rate, and sex), and higher scores portend worse prognosis. Although the BACES score has been validated in a cohort of South Korean patients, it has not yet been validated in other settings or ethnic groups.

RESEARCH QUESTION

How well does the BACES mortality score perform in a cohort of Canadian patients with NTM-PD?

STUDY DESIGN AND METHODS

We performed a single-center retrospective chart review. Patients who were seen between July 2003 and June 2021 were eligible for inclusion if they met guideline-based diagnostic criteria for NTM-PD and were excluded if any component of the BACES score was missing. To assess the model's discriminatory performance, we compared Kaplan-Meier curves between risk groups and calculated Harrell's C index. To assess calibration, we used a graphical calibration curve.

RESULTS

The cohort included 435 patients with a median follow-up of 5.8 years. The median age was 64 years and 74% were female. Based on the BACES scores, patients were classified into three risk groups: low, moderate, or high. Survival curves showed clear separation of the risk groups. Harrell's C index was 0.733 in the study cohort, indicating moderate to good discriminatory performance, although this was lower than the value reported in the derivation cohort (0.812). The graphical calibration curve showed a tendency of the BACES model to underpredict mortality.

INTERPRETATION

The BACES model was evaluated in a multicultural cohort of Canadian patients and demonstrated good discriminatory performance but suboptimal calibration, which may be due to population differences, the use of dichotomized variables in model construction, or both.

Fluorescence emission quenching of RdB fluorophores in attendance of various blood type RBCs based on Stern-Volmer formalism

In this work, the optical properties of Rhodamine B (RdB) are investigated in the attendance of various red blood cells (RBCs). RdB fluorophores, as biological markers, is excited using SHG-CW Nd:YAG laser at 532 nm. In fact, the addition of biomolecules of interest to the reference fluorophore notably changes the fluorescence properties of the suspension. Here, laser induced fluorescence (LIF) spectrophotometry based on Stern-Volmer quenching formalism and field emission scanning electron microscope (FESEM) are employed here. According to the given fluorescence spectra, the spectral shift of emissions as well as quenching coefficients are assessed subsequently. The Stern-Volmer formalism is used to determine the quenching coefficients. In fact, RdB + RBCs suspensions contain a plenty of bioconjugates leading to the signal reduction and notable red shift in RdB fluorescence emissions. Furthermore, it is demonstrated that the positive blood type RBCs exhibit the higher quenching coefficients and the larger red shifts against those of negative blood types. This mainly arises from the nature of specific sugar antigens available on the RBC membranes as to N-acetylgalactosamine and galactose attached to the O-antigen terminal would enhance further quenching of the species. Moreover, a significant correlation appears between Stern-Volmer coefficients and the corresponding RBCs. In fact, distinct discrepancy takes place in quenching coefficients in terms various positive/negative blood types to envisage a facile method of blood typing.

Evaluating the antibiotic resistance and frequency of adhesion markers among Escherichia coli isolated from type 2 diabetes patients with urinary tract infection and its association with common polymorphism of mannose-binding lectin gene

The present paper aims to determine the frequency and antibiotic resistance patterns of pathogenic bacteria, the virulence factor profile of Escherichia coli and mannose-binding lectin (MBL) gene polymorphism in individuals with diabetes mellitus (DM) and urinary tract infection (UTI). The population under study was 130 individuals with type 2 diabetes mellitus (T2DM) and UTI. The patients' clinical characteristics and urine and blood samples (5 mL) were collected. Antibiotic resistance was determined using a disc diffusion method, and the results were interpreted according to CLSI. The presence of virulence genes was detected by multiplex PCR. To detect the MBL gene polymorphism, PCR and restriction fragment length polymorphism methods were applied. The predominant Gram-negative and Gram-positive bacteria included E. coli and Streptococcus spp.viridans group, respectively. Women were more susceptible to the incidence of UTI than men. The E. coli isolates showed a high level of resistance to amoxicillin-clavulanic acid (87.35%), and nitrofurantoin and ceftizoxime were the most effective antimicrobial agents for E. coli. Cefotaxime and ceftizoxime were the most effective antimicrobial agents for Enterobacter spp., norfloxacin and ciprofloxacin were the most effective antimicrobial agents for Staphylococcus epidermidis and Staphylococcus saprophyticus. papGII (52.87%) and papEF (1.14%) had the highest and lowest frequency among examined genes in E. coli isolates, respectively. The GG genotype had the highest frequency among patients with T2DM and UTI. Results showed that the detection of E. coli in individuals with an AA genotype, codon 54 of the MBL gene, can play an important role in the molecular diagnosis and timely treatment of bacterial infections in individuals with diabetes.

Chitosan-based Nanoparticles in Mucosal Vaccine Delivery

Most infectious diseases are caused by pathogenic infiltrations from the mucosal tract. Nowadays, the use of vaccines has been widely investigated for the prevention of different infectious diseases, infertility, immune disorders, malignancies, and allergies. Broad-spectrum adjuvant substances have been studied for immune system stimulation with a greater efficiency against specific antigens. Various adjuvants have been developed such as inorganic, oil-based, and emulsion adjuvants, bacterial products and their derivatives, cytokines, cytosine-guanine dinucleotide (CpG) motifs, and particulate systems. Mucosal vaccine delivery is an alternative route to induce both humoral and cellular immune responses. Applying nanoparticles in vaccine formulations allows not only improved antigen stability and immunogenicity, but also targeted delivery, and consequently, more specific release of the agent of interest. Chitosan nanoparticles have immunological activity and mucoadhesive properties. They have been used as a mucosal vaccine delivery system for many antigens. This review provides an overview of the recent advances in chitosan nanoparticles as a novel mucosal vaccine delivery system.

Investigation of the Effect of Folic Acid Based Iron Oxide Nanoparticles on Human Leukemic CCRF-CEM Cell Line

BACKGROUND

Nanoparticulate drug delivery systems have attracted significant attention in the field of cancer nanotechnology. This study determines the effect of folate-based Fe2O3 nanoparticles. This study aimed to decorate nanoparticles with folate (FA), a molecular ligand for 'active' targeting of cancerous cells and the application of modified-nanoparticles in cancer treatment.

MATERIALS AND METHODS

The nanoparticles were prepared by a solvent evaporation and emulsification cross-linking method and anticancer activity of agent was evaluated on CCRF CEM cells, derived from human blood cancer samples.

RESULTS

The physicochemical properties of the nanoparticles were characterized by various techniques, and uniform nanoparticles with an average particle size of 110±15 nm were obtained. Cytotoxicity tests showed that the SPIO-FA had higher cell toxicity, and confocal microscopy analysis confirmed excellent cellular uptake efficiency.

CONCLUSION

These results indicate that FA based SPIO-NPs have potential uses as anticancer drug carriers and also have an enhanced anticancer effect.

Immunosuppressive proteins isolated from spiral and coccoid cytoplasmic solutions of Helicobacter pylori

The aim of this study was to investigate the antiproliferative proteins that probably have a role in Helicobacter pylori evade of immune response and cause chronic infection disease and also to see if coccoid form had a role in its chronicity. H. pylori strain VacA s2/m2 positive and CagA negative, from a gastric biopsy of a patient with peptic ulcer disease, was isolated and cultured in brucella agar. Both spiral and coccoid forms were harvested and ruptured by sonication. The cytoplasmic solutions of both forms were collected and their fractions obtained by gel chromatography and preparative polyacrylamide gel electrophoresis. The fractions were analyzed by MTT assay for their antiproliferative activity. We isolated two proteins with a significant dose dependent antiproliferative activity that analyzed with sodium dodecyl sulfate-polyacrylamide gel electrophoresis, one of them that was urease positive showed two bands with 61 and 27 kDa, which is resumed to urease of H. pylori, another consist of 57 and 63 kDa. Helicobacterpylori secret some proteins like urease that inhibit immune cells proliferation response against its antigens.

Fatigue, depression, and health-related quality of life in patients with multiple sclerosis in Isfahan, Iran

BACKGROUND AND PURPOSE

Quality of life (QoL) of patients with multiple sclerosis (MS) is worse than that of other chronic diseases. There is a need to examine the impact of fatigue and depression on the QoL independent of level of physical disability in MS. The aim of this study is to explore physical, psychological, and social aspects of health-related QoL (HRQoL) of MS patients in association with physical disability, fatigue, and depression.

METHODS

In a cross-sectional study, 281 (63.4% women, 36.6% men) patients with MS participated in the study. The HRQoL was assessed by the Persian version of the multiple sclerosis quality of life (MSQoL-54) questionnaires. Other covariates included in the study were disease type, physical disability, fatigue, disease impact, and depression.

RESULTS

In univariate analysis disease type, physical disability, fatigue, disease impact, and depression were significantly associated with both physical and mental health composite summaries of MSQoL-54. In multivariate regression analysis, patients' physical disability remained significantly associated with both components of MSQoL-54, whilst fatigue and depression were associated with physical and mental composite summaries, respectively.

CONCLUSIONS

Our findings suggest that MS-related physical disability, fatigue, and depression affect the HRQoL of MS patients, independently of each other and other potential confounding factors. Effective interventions that target fatigue and depression may help improve the QoL of patients, regardless of their disease type and level of disability.

Validation of the harmless acute pancreatitis score in predicting nonsevere course of acute pancreatitis

BACKGROUND

The Harmless Acute Pancreatitis Score (HAPS) is a scoring algorithm to identify patients with nonsevere acute pancreatitis. The aim of this study was to evaluate the reproducibility of HAPS outside its original study setting.

METHOD

Baseline information of all hospitalized patients with acute pancreatitis at Karolinska University Hospital, Stockholm, Sweden, between 2004 and 2009 was collected. The parameters constituting HAPS were signs of peritonitis, hematocrit and serum creatinine levels. Since hematocrit was not available in all patients, complete sample analysis was performed by replacing hematocrit with hemoglobin (strongly correlated with hematocrit; r = 0.86).

RESULTS

In total, 531 patients with a first-time or a recurrent attack of acute pancreatitis were included. Among 353 patients with complete information on parameters constituting HAPS, 79 patients were predicted to have a nonsevere course, of whom 1 patient developed severe acute pancreatitis. The specificity of HAPS in predicting a nonsevere course of acute pancreatitis was 96.3% (95% CI: 81.0-99.9) with a corresponding positive predictive value of 98.7% (95% CI: 93.1-100). Complete sample analysis replacing hematocrit with hemoglobin level predicted a nonsevere course in 182 patients, of whom 2 patients had severe acute pancreatitis (94.3% specificity and 98.9% positive predictive value).

CONCLUSION

HAPS is a highly specific scoring algorithm that predicts a nonsevere course of acute pancreatitis. Therefore, HAPS might be an additional tool in the clinical assessment of acute pancreatitis where early screening is important to treat the patients at an optimal level of care.

Immunhistochemischer Nachweis einer verst�rkten Anreicherung von Isoprostan 8-epi-PGF2? in den Gef��l�sionen bei Arteriitis temporalis

BACKGROUND AND PURPOSE

Oxidative injury caused by lipid oxidation is considered a major factor in the development of several ocular disorders including temporal arteritis. This study investigates the role of 8-epi-PGF2alpha as a marker of oxidative stress in vivo.

PATIENTS AND METHODS

Sections from isolated human temporal arteries, obtained from patients suspected of having giant cell arteritis ( n=22), were analyzed by semiquantitative immunohistochemistry and planimetry.

RESULTS

Immunoreactivity for 8-epi-PGF2alpha was significantly higher in patients with temporal arteritis (AT) compared to healthy temporal arteries (Co). The percentage of the areas stained positive in immunohistochemistry was higher in the AT group compared to the control group (Co). The enrichment values in the intimal layer containing the endothelium of the same temporal arteries were also significantly higher ( p<0.01) in temporal arteries of the AT group.

CONCLUSIONS

Our findings of an enhanced accumulation of 8-epi-PGF2alpha in areas of the arterial wall subjected to extensive vascular tissue destruction suggest that lipid peroxidation products may also play a role in the pathogenesis of this disease.

Incisional hernia after renal transplantation and its repair with propylene mesh

PURPOSE

Kidney recipients are susceptible to incisional hernia. We studied predisposing factors for incisional hernia in our patients and the results of its repair with propylene mesh.

MATERIALS AND METHODS

From 1989 to 2002, 589 patients had undergone kidney transplantation in our hospital. Of these, patients who developed incisional hernia were evaluated in this study. The following data were collected from their records: age, gender, weight, age at graft rejection, surgical complications, treatment method, and the treatment results with propylene mesh.

RESULTS

Of 589 recipients, 16 (3%) developed incisional hernia in surgical site. The median interval between kidney transplantation and developing of incisional hernia was 48 (range 12 to 425) days. Predisposing factors were overweight, age over fifty years, and female gender (P <0.005). In four patients, hernia was small, and the repair was performed without using mesh. Three patients were reluctant to hernia repair, and in 9, due to the large size of hernia, repair was done using propylene mesh. Having these 9 patients treated with propylene mesh, 2 developed serous collection in surgical site, which were managed successfully with multiple punctures. Hernia recurrence or infection was not noted in these patients during 3 to 36 months follow-up periods.

CONCLUSION

Incisional hernia is not a rare entity after kidney transplantation. Predisposing factors, such as overweight, age over 50 years, and female gender have a role in its development. Also, repeated surgeries in kidney recipients can increase the risk of incisional hernia. Managing this complication with propylene mesh is a safe and effective method.

Immunhistochemischer Nachweis ver�nderter Low-density-Lipoproteine (ox-LDL) in der Gef��wand bei Patienten mit Arteriitis temporalis

BACKGROUND AND PURPOSE

Recent data indicate that lipid peroxidation is implicated in the pathogenesis of giant cell arteritis with a close anatomic relationship between reactive oxygen species and oxidatively injured vascular tissue.

PATIENTS AND METHODS

Immunohistochemistry utilizing anti-ox-LDL was performed on paraffin sections of isolated temporal arteries obtained from patients (n=23) suspected of having temporal arteritis. Enrichment as well as staining intensity of ox-LDL in vascular tissue was analysed by digital image planimetry.

RESULTS

Temporal arteries with biopsy proven temporal arteritis (n=11) presented with significantly higher enrichment of ox-LDL in the intima (16.9+/-4.2% vs. 11.25+/-2.3%; p<0.01) and mean (9.6+/-2.4% vs. 6.75+/-1.8%; p<0.01) as compared to healthy controls. Comparable results for the staining intensity were found in the intimal (2.8+/-0.5 eU vs. 1.7+/-0.4 eU; p<0.01) and medial layer (1.55+/-0.5 eU vs. 1.04+/-0.6 eU; p<0.01) of diseased patients compared to controls.

CONCLUSIONS

Accumulation of ox-LDL in the intimal layer, especially at the intima-media-border, was closely related to disruption of the elastica interna and adjacent vascular tissue, presumably contributing to the underlying process of intimal hyperplasia through unimpeded migration of smooth muscle and accumulation inflammatory cells.

Increased plasma, serum and urinary 8-epi-prostaglandin F2 alpha in heterozygous hypercholesterolemia

Oxidation injury results in foam cell formation, which is known to be a central mechanism in atherogenesis. We investigated in this study whether 8-epi-prostaglandin (PG) F2 alpha, an in vivo indicator of oxidative stress, is elevated in hyperlipoproteinemia. The isoprostane 8-epi-PGF2 alpha levels in plasma, serum and urine were determined in 123 patients (67 m, 56 f; 17-60 years) suffering from familial heterozygous hypercholesterolemia (FH). A group of 99 normocholesterolemic adults (51 m, 48 f; 20-63 years) served as controls. Plasma, serum and urine levels of 8-epi-PGF2 alpha were significantly (p < 0.01) higher in the FH group. Smokers showed elevated 8-epi-PGF2 alpha levels; however, no correlation was observed to hypertension, age and sex. Successful dietary and drug treatment of FH patients resulted in a significant decrease in 8-epi-PGF2 alpha levels in plasma, serum and urine. These findings indicate that FH is associated with increased oxidation injury, which is beneficially influenced by successful dietary and/or drug treatment.

Assessment of myocardial viability by dobutamine echocardiography, positron emission tomography and thallium-201 SPECT: correlation with histopathology in explanted hearts

OBJECTIVES

We examined the relationship among viability assessment by dobutamine echocardiography (DE), positron emission tomography (PET) and thallium-201 single-photon emission computed tomography (TI-SPECT) to the degree of fibrosis.

BACKGROUND

DE, PET and TI-SPECT have been shown to be sensitive in identifying viability of asynergic myocardium. However, PET and TI-SPECT indicated viability in a significant percentage of segments without dobutamine response or functional improvement after revascularization.

METHODS

Twelve patients with coronary artery disease and severely reduced left ventricular function (EF 14.5+/-5.2%) were studied with DE prior to cardiac transplantation: 5 had additional PET and 7 had TI-SPECT studies. Results of the three techniques were compared to histologic findings of the explanted hearts.

RESULTS

Segments with >75% viable myocytes by histology were determined to be viable in 78%, 89% and 87% by DE, PET and TI-SPECT; those with 50-75% viable myocytes in 71%, 50% and 87%, respectively. Segments with 25-50% viable myocytes showed response to dobutamine in only 15%, but were viable in 60% by PET and 82% by TI-SPECT. Segments with <25% viable myocytes responded to dobutamine in 19%; however, PET and TI-SPECT demonstrated viability in 33% and 38%, respectively. Discrepant segments without dobutamine response but viability by PET and SPECT had significantly more viable myocytes by pathology than did those classified in agreement to be nonviable but had significantly less viable myocytes than those classified in agreement to be viable (p < .001).

CONCLUSIONS

These findings suggest that contractile reserve as evidenced by a positive dobutamine response requires at least 50% viable myocytes in a given segment whereas scintigraphic methods also identify segments with less viable myocytes. Thus, the methods may provide complementary information: Nuclear techniques appear to be highly sensitive for the detection of myocardial viability, and negative tests make it highly unlikely that a significant number of viable myocytes are present in a given segment. Conversely, dobutamine echo may be particularly useful for predicting recovery of systolic function after revascularization.

Measuring extracellular matrix turnover in the serum of patients with idiopathic or ischemic dilated cardiomyopathy and impact on diagnosis and prognosis

Circulating levels of extracellular matrix components were measured by radioimmunoassays and tested if they were useful for clinical staging in chronic heart failure. In 41 patients with dilated cardiomyopathy (33 idiopathic and 8 ischemic cases), the serum concentrations of procollagen type III aminoterminal peptide (PIIINP), type I collagen telopeptide (ICTP), and basement membrane laminin were significantly higher than in 30 healthy controls regardless of the underlying etiology. Patients with serum values of PIIINP, ICTP, and laminin > 7 micrograms/L, 7.6 micrograms/L, and 2.3 U/ml, respectively, were at higher relative risk for advanced clinical stage, poor hemodynamic condition, hyponatremia, heart transplantation, and death during follow-up than patients with low levels, with the exception that serum laminin > 2.3 U/ml was not significantly associated with hyponatremia and heart transplantation. Despite their interdependence on liver function, circulating levels of PIIINP and ICTP were independent predictors of mortality. In 17 of the 41 patients with cardiomyopathy whose explanted hearts were available for histologic evaluation, serum PIIINP, ICTP, and laminin significantly correlated with the myocardial area fractions of their tissue analogues (PIIINP vs myocardial collagen type III, r = 0.784, p = 0.0013; serum ICTP vs myocardial collagen type I, r = 0.603, p = 0.0527; and serum laminin vs myocardial laminin, r = 0.605, p = 0.0411). In conclusion, the increase in extracellular matrix turnover, which may partially be derived from fibrosis in the myocardium, can be measured in the serum of patients with dilated cardiomyopathy, and has an impact on risk stratification and prognosis.

Endomyocardial HLA expression is increased to the same extent in idiopathic and secondary dilated cardiomyopathy

In a total of 22 failing hearts from human transplant recipients, the expression of major histocompatibility complex (MHC) molecules, the CD phenotype of infiltrating mononuclear cells, and the number of fibroblasts were analyzed by immunohistochemistry. Compared with 10 non-failing control hearts, significantly higher morphometric area fractions of HLA-ABC and HLA-DR with a concomitant increase of CD3-, CD4- and CD8-positive cells were found to be comparable in 12 patients with idiopathic dilated cardiomyopathy and in 10 patients with secondary heart failure. Furthermore, the similarity of T-cell activation in idiopathic and secondary variants of the disease were substantiated by the following observations: (1) the site-specific distribution of MHC molecules and mononuclear cells in the myocardium was comparable in idiopathic and secondary dilated cardiomyopathy; (2) 6 individuals with lymphocytic aggregates in their myocardium in association with the highest levels of HLA-ABC expression were equally distributed among idiopathic and secondary patient subsets; and (3) expression of HLA-ABC and HLA-DR correlated with that of an endothelial cell marker, von Willebrand factor, in failing myocardia of both study groups. In conclusion, no difference was found in increased MHC molecule expression in failing myocardium of idiopathic and secondary variants of dilated cardiomyopathy, and these entities were not differentially associated with infiltration by increased numbers of T lymphocytes. Hence, we postulate that these immunopathological features are consequences rather than causative factors of myocardial degeneration and dilatation.(ABSTRACT TRUNCATED AT 250 WORDS)

Serum-soluble CD4 as clinical and immunological marker in patients with dilated cardiomyopathy

Serological markers of cell-mediated immunity, i.e., soluble CD4, soluble interleukin-2 (Il-2) receptor and beta 2-microglobulin, were determined in 60 patients with dilated cardiomyopathy. Compared with normal healthy donors (n = 30) and controls who had coronary artery disease with preserved left ventricular function (n = 20), significantly increased levels associated with the New York Heart Association functional classes have been found in the cardiomyopathy patients, irrespectively of the etiology. Out of the immunological variables tested, serum-soluble CD4 most closely reflected the clinical and hemodynamic stage, predicted the presence of lymphocytic aggregates in the myocardium and correlated with the CD4/CD8 ratios of endomyocardial lymphocytes (r = 0.6, P < 0.05). Conversely, focal mononuclear infiltration of the myocardium was associated with significantly elevated CD4/CD8 ratios (2.1 +/- 0.6 vs. 1.3 +/- 0.2, P < 0.05), higher total numbers and percentages of endomyocardial lymphocytes expressing the pan T-markers CD2 and CD3, more CD45RO/UCHL1-positive cells and more CD4-positive T-helper cells, compared with non-reactive cases the lymphocytes of which were scattered throughout the myocardium. In conclusion, in a subset of cardiomyopathy patients lymphocytic clusters in the myocardium indicated an enhanced cellular immune response predominantly mediated by CD4-positive T-helper lymphocytes with active memory function. This immunopathological condition in the heart can be monitored by serum-soluble CD4.