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1.
Egypt J Immunol ; 31(2): 18-27, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38615201

RESUMO

Multiple sclerosis (MS) is a multifactorial polygenic disease; results from autoimmune and neurodegenerative processes which lead to multifocal lesions of the central nervous system. Axonal degeneration was found to be prominent in the inflammation period of MS and contribute to the progression of disability. Soluble N-ethylmaleimide sensitive factor attachment receptor (SNARE) complex plays a vital role in the release of neurotransmitter by synaptic vesicle fusion. Stx-1A protein (Stx-1A), a major component of the SNARE complex, is widely expressed in brain tissue. This study intended to evaluate the prevalence of the Stx-1A gene polymorphism (rs1569061) in the Egyptian population with MS and to investigate its association with various clinical factors. This study included 65 adult Egyptian MS patients and 35 age- and sex-matched normal control subjects. Diagnosis of MS was made by an experienced neurologist according to revised McDonald criteria. All Patients underwent full history taking, included Age of onset of MS, disease duration, disease course and degree of disability according to the Expanded Disability Status Scale (EDSS) and family history of neurological diseases. Stx-1A gene polymorphism (rs1569061) genotyping was performed by TaqMan assay based quantitative real time (qPCR) and verified by sanger sequencer. Genotype and allele frequencies of (rs1569061) did not differ significantly between case and control groups. No difference was detected when comparing the genotype frequency and the allele frequency to different disease parameters. Discrepancy of the minor allele frequency (MAF) of Stx-1A gene (rs1569061) between different populations was noted. In conclusion, our study in Stx-1A gene polymorphism (rs1569061) and MS showed that no difference between the patient and control as regards gene frequency and allele frequency. Predicting no association between the studied polymorphism and MS in the Egyptian population. However, discrepancy between different population was noted as regards the MAF for Stx-1A gene (rs1569061).


Assuntos
Esclerose Múltipla , Sintaxina 1 , Adulto , Humanos , Egito/epidemiologia , Frequência do Gene , Esclerose Múltipla/genética , Polimorfismo Genético , Proteínas SNARE , Sintaxina 1/genética , População do Norte da África/genética
2.
Neuroradiol J ; : 19714009241247462, 2024 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-38622821

RESUMO

INTRODUCTION: Wide-necked bifurcation aneurysms pose significant challenges for endovascular treatment. A recent innovation, the stent plus balloon-assisted coiling technique, combines a stent and a balloon to address these aneurysms effectively. PURPOSE: To evaluate the safety and efficacy of the stent plus balloon-assisted coiling for the treatment of wide-necked bifurcation aneurysms. METHODS: We conducted a retrospective review of our endovascular database to identify patients who were treated with this technique and had a satisfactory angiographic follow-up of at least 24 months. Technical success, initial clinical and angiographic outcomes, procedural complications, and follow-up results were analyzed. Angiographic and clinical outcomes were assessed using Modified Raymond-Roy Classification and Modified Rankin Scale, respectively. RESULTS: Our study included 37 aneurysms in 36 patients (26 females) with a mean age of 56.6 years. Mean aneurysm and neck sizes were 7.3 ± 3.5 mm and 3.7 ± 1.0 mm, respectively. Technical success reached 97.2%, with an immediate occlusion rate of 65.7%. At a mean follow-up of 36.5 ± 9.7 months, final angiographic follow-up showed a 91.9% complete occlusion rate. Three aneurysms did not achieve complete occlusion; however, none required retreatment. Complications developed in 32.4% of the procedures. Mortality and morbidity rates were 5.4% and 2.7%, respectively. A good clinical outcome was observed in 91.9% of patients. CONCLUSION: Our results showed that stent plus balloon-assisted coiling technique allows good angiographic outcomes for wide-necked bifurcation aneurysms. However, overall complication rate is high. Subgroup analysis indicated promising safety and efficacy for MCA bifurcation aneurysms, suggesting this technique could be a valuable option for select aneurysms.

3.
Neurosurg Rev ; 47(1): 123, 2024 Mar 20.
Artigo em Inglês | MEDLINE | ID: mdl-38503965

RESUMO

Low-profile stents may provide significant advantages in Y-stent-assisted coiling due to their miniaturized design and capability to be delivered through a 0.0165-inch microcatheter. We aim to investigate the safety and efficacy of using these newer versions of stents in Y-stent-assisted coiling for the treatment of wide-necked bifurcation aneurysms. We conducted a systematic review of the PubMed, Embase, Cochrane Library, and Web of Science databases up to September 2023, following the PRISMA guidelines. Eligible studies included ≥ 5 patients with intracranial wide-necked bifurcation aneurysms treated with Y-stent-assisted coiling using low-profile stents, providing angiographic and clinical outcomes. Two authors independently handled the search and selection. Primary outcomes were immediate and follow-up aneurysm occlusion, procedure-related complications, aneurysm recanalization, and retreatment. Secondary outcomes included technical success, procedure-related morbidity, procedure-related mortality, procedure-related stroke, and in-stent stenosis at follow-up. We analyzed the data using random-effects meta-analysis. In total, 19 studies including 507 patients with 509 aneurysms were included. 95% of the treated aneurysms were managed using the crossing Y-configuration. Technical success rate was 99%. Immediate adequate aneurysm occlusion was 90%. Follow-up angiographies were available for 443 aneurysms. The mean angiographic follow-up duration was 15.6 ± 1.9 months. The rates for follow-up adequate aneurysm occlusion and complete occlusion were 98% and 89%, respectively. After a mean clinical follow-up of 15 ± 2.4 months, a good clinical outcome was observed in 98% of patients. Overall, procedure-related morbidity and mortality rates were 1.3%, and 0.4%, respectively. Low-profile stents in Y-stent-assisted coiling outperform previous stent versions in terms of safety, efficacy, and technical success rates.


Assuntos
Embolização Terapêutica , Aneurisma Intracraniano , Humanos , Resultado do Tratamento , Estudos Retrospectivos , Stents , Aneurisma Intracraniano/complicações , Angiografia Cerebral
4.
Sci Rep ; 14(1): 5717, 2024 03 08.
Artigo em Inglês | MEDLINE | ID: mdl-38459097

RESUMO

To determine the extent of pesticide buildup and their environmental contamination, the environmental half-lives of pesticides are examined. The influence of the factors affecting the half-lives of fipronil and thiamethoxam including soil type, sterilization, temperature, and time and their interactions was studied using experimental modeling design by Minitab software. Based on the dissipation kinetics data, fipronil concentrations reduced gradually over 60 days while thiamethoxam concentrations decreased strongly. Also, fipronil and thiamethoxam dissipated more rapidly in calcareous soil than in alluvial soil. Thiamethoxam, however, disappeared more rapidly than fipronil in all treatments. Incubation at 50 °C leads to rapid the pesticide degradation. For prediction of the dissipation rate, model 5 was found to be the best fit, Residue of insecticide (%) = 15.466 - 11.793 Pesticide - 1.579 Soil type + 0.566 Sterilization - 3.120 Temperature, R2 = 0.94 and s = 3.80. Also, the predicted DT50 values were calculated by a model, DT50 (day) = 20.20 - 0.30 Pesticide - 7.97 Soil Type + 0.07 Sterilization - 2.04 Temperature. The shortest experimental and predicted DT50 values were obtained from treatment of thiamethoxam at 50 °C in calcareous soil either sterilized (7.36 and 9.96 days) or non-sterilized (5.92 and 9.82 days), respectively. The experimental DT50 values of fipronil and thiamethoxam ranged from 5.92 to 59.95 days while, the modeled values ranged from 9.82 to 30.58 days. According to the contour plot and response surface plot, temperature and sterilization were the main factors affecting the half-lives of fipronil and thiamethoxam. The DT50 values of fipronil and thiamethoxam increased in alluvial soil and soil with low temperature. In general, there is a high agreement between the experimental results and the modeled results.


Assuntos
Inseticidas , Resíduos de Praguicidas , Praguicidas , Pirazóis , Poluentes do Solo , Tiametoxam , Solo , Neonicotinoides , Resíduos de Praguicidas/análise , Inseticidas/metabolismo , Praguicidas/metabolismo , Cinética , Poluentes do Solo/metabolismo
6.
Sci Rep ; 13(1): 9945, 2023 Jun 19.
Artigo em Inglês | MEDLINE | ID: mdl-37337045

RESUMO

Sheets of high-density polyethylene (HDPE) loaded with magnesium oxide in micro and nano were synthesized with different weight percentages of micro-MgO (0,5,10,20 and 30% by weight) and nano-MgO (5 and 30%) and shaped in form of disc and dog bone shape. The morphological, mechanical, and attenuation characteristics of each concentration were determined. The linear attenuation coefficients (LAC) of the prepared discs were calculated using a well-calibrated scintillation detector and five standard gamma-ray point sources (241Am, 133Ba, 137Cs, 60Co and 152Eu). The LAC was theoretically calculated for HDPE/micro-MgO composites using XCOM software. A good agreement between the theoretical and experimental results was observed. The comparison between micro and nano-MgO as a filler in HDPE was evaluated. The results proved that the loaded nano-MgO in different proportions of HDPE produced greater attenuation coefficients than its micro counterpart. The addition of nano MgO with different weight percentage led to a significant improvement in the mechanical properties of HDPE, the ultimate force and ultimate stress increased as the concentration of nano MgO increased, and the young modulus of HDPE also increased with increasing concentration of micro and nano MgO.

8.
Obes Surg ; 33(2): 418-425, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36502436

RESUMO

BACKGROUND: Obesity is a widely prevalent medical and socioeconomic problem. Bariatric surgery is indicated for patients with clinically severe obesity. Reduction of gastric volume is an important factor that contributes to weight loss after laparscopic sleeve gastrectomy (LSG). The impact of the gastric volume on weight after LSG has been studied. AIM OF THE STUDY: This study was designed to assess the gastric volume in patients with obesity prior to LSG and in the normal-weight patients, using three-dimensional multi-detector computer tomography (3D-MDCT), and to evaluate the potential correlation of the gastric volume with body mass index (BMI). PATIENTS AND METHODS: A total of 100 patients were equally enrolled in two groups: one group for patients with obesity scheduled for LSG and another one for normal-weight patients scheduled for non-bariatric surgery. The study patients underwent 3D-MDCT gastric volumetry. RESULTS: The gastric volume ranged from 525 to 1170 mL in patients with obesity and from 312 to 676 mL in the normal-weight group. Statistically significant difference was found between the two groups. Age, weight, and BMI were found to be predictors for the gastric volume in normal-weight patients only. CONCLUSION: MDCT gastric volumetry is a feasible method to assess the stomach volume. Higher volumes were evident in patients with obesity. Age, weight, and BMI are predictors for the gastric volume in normal-weight patients with linear regression equations that could help during the preoperative planning of bariatric surgeries.


Assuntos
Laparoscopia , Obesidade Mórbida , Humanos , Obesidade Mórbida/cirurgia , Laparoscopia/métodos , Estômago/diagnóstico por imagem , Estômago/cirurgia , Obesidade/cirurgia , Gastrectomia/métodos , Índice de Massa Corporal , Tomografia Computadorizada por Raios X , Tomografia , Resultado do Tratamento , Estudos Retrospectivos
9.
Heliyon ; 8(10): e10875, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36210863

RESUMO

The effects of the COVID-19 pandemic on mental health are likely to worsen as the epidemic progresses and will last long even after the pandemic has passed. The present study developed a coronaphobia scale during the pandemic to measure its psychological effects such as fear, anxiety, and depression in the majority of the cases in the United Arab Emirates (UAE). It is a 35-item scale that measures anxiety symptoms connected with COVID-19 and may be used to identify people who require mental health treatment. Based on 618 adults, the reliability and validity of these items were appropriate. The scales were distributed via social media using a Google form. Internal consistency, reliability analysis, and structural equation models, particularly confirmatory factor analysis, were carried out. The elevated scores on the coronaphobia scale were associated with social phobia, anxiety, stress, and depression. The coronaphobia score distinguishes well between those with and without dysfunctional anxiety (85% specificity and 90% sensitivity). These results support the coronaphobia scale as a valid and effective tool for clinical practice and research.

10.
Plast Reconstr Surg Glob Open ; 10(7): e4445, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35923984

RESUMO

Background: Various materials have been developed as skin fillers to correct wrinkles of the face. Dermal fillers are classified based on their biodegradability into bioresorbable versus nonbioresorbable. All dermal fillers have a potential risk of complications, which can be classified as early and late onset events. Among all the complications of filler injections, inflammatory nodules and granulomas are the most annoying and disfiguring. The purpose of the study was to provide a surgical treatment algorithm that allows us to deal with the complications of facial fillers through three surgical techniques. Methods: Thirty-one patients with complaints of facial contour abnormalities after filler injection, three surgical techniques were adopted according to the presenting case including face lift incision, needle aspiration and intraoral excision after preoperative preparation of the case with postoperative follow-up for 6 months. Results: Among our studied patients treated by these surgical techniques, dissection was difficult owing to the fibrosis and the granulomatous reaction post complicated filler injection. There were two cases of hematoma, 1 case of seroma, and 1 case of facial nerve injury that improved after 4 months, in which marked improvement of facial contour and skin quality was observed. Conclusions: The use of the facelift technique as a surgical treatment for post filler complication granuloma excision provides a useful and satisfactory method for patients complaining of major facial deformities following repeated complicated filler injections. Despite being more difficult than other techniques it is more satisfactory in facial rejuvenation post complicated facial fillers.

11.
J Diabetes Metab Disord ; 21(1): 439-444, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35673516

RESUMO

Purpose: Engulfment and cell motility 1 (ELMO1), is a candidate gene responsible for cell motility and phagocytosis. However, its role in the development and progression of nephropathy attributed to T2D is still unknown. Kidney injury molecule-1 (KIM-1) plays a significant role in renal regeneration processes. The current study aimed to evaluate the association between kidney injury molecule-1 levels, ELMO1 gene polymorphism (rs741301, and rs1345365) as well as DN in an Egyptian population with T2D. Methods: In this study, we enrolled 89 participants from the internal medicine outpatient clinic, 23 T2DM without DN, 22 with DN, and 44 control subjects. They were genotyped by real-time PCR. Serum level of KIM-1 was detected by ELISA. Results: Serum KIM-1 level was correlated with DM duration, HbA1C, and UACR (P value <0.001) in T2D. There was no significant difference in the allelic and genotypic frequencies of rs741301 and rs1345365 between participants with DM who presented with albuminuria and those without. Results showed that rs1345365A/rs741301T and rs1345365G/rs741301C haplotypes were more common in patients with T2D than in HCs. However, the difference was not statistically significant (P = 0.262 and 0.414, respectively). Conclusions: KIM-1 can be a useful non-invasive biomarker for detecting early DN. The association between ELMO1 gene polymorphisms and the risk of DN in patients with T2D was not validated. Therefore, further studies with a larger sample size must be conducted.

12.
Pediatr Res ; 92(6): 1689-1694, 2022 12.
Artigo em Inglês | MEDLINE | ID: mdl-35338352

RESUMO

BACKGROUND: The major increase in the survival rate among children with cancer is due to improvement in the diagnosis and treatment. Despite this increase, childhood cancer survivors (CCS) are at high risk of developing late complications such as nephrotoxicity due to chemotherapy. So, we aimed to detect early subclinical kidney dysfunction among CCS. METHODS: This cross-sectional study was implemented on 52 survivors of childhood cancer recruited from Pediatric Oncology Unit, Menoufia University. Laboratory evaluations for each participant, including complete blood count, serum urea, creatinine, urinary protein, urinary calcium, uric acid, and serum cystatin C and urinary Neutrophil Gelatinase Associated Lipocalin (UrNGAL) by ELISA were obtained. RESULTS: Estimated GFR was decreased in 23.1% of cases, with elevated serum cystatin C, UrNGAL and UrNGAL/Cr. There was a significant increase of Uprotein/Cr, UCa/Cr, UACR (p = 0.02), UrNGAL and UrNGAL/Cr (P < 0.001) in patients with tubular dysfunction compared without tubular dysfunction. There was a significant difference between two groups regarding cisplatin (P = 0.03) and high-dose methotrexate chemotherapy (p = 0.04). The AUCs for detecting kidney tubular dysfunction by UrNGAL and UrNGAL/Cr were 0.807 and 0.747. CONCLUSION: A significant tubular dysfunction among childhood cancer survivors receiving chemotherapy as cisplatin and high-dose methotrexate. IMPACT: Detection of kidney dysfunction mainly tubular in childhood cancer survivors after finishing chemotherapy. Urinary NGAL is a good predictor for detection of tubular dysfunction in childhood cancer survivors after finishing chemotherapy.


Assuntos
Injúria Renal Aguda , Sobreviventes de Câncer , Neoplasias , Insuficiência Renal , Humanos , Criança , Cisplatino , Cistatina C , Metotrexato , Estudos Transversais , Neoplasias/complicações , Neoplasias/tratamento farmacológico , Lipocalina-2/urina , Rim , Biomarcadores , Injúria Renal Aguda/diagnóstico , Creatinina
13.
Confl Health ; 16(1): 7, 2022 Feb 21.
Artigo em Inglês | MEDLINE | ID: mdl-35189938

RESUMO

Fragile and shock-prone settings (FASP) present a critical development challenge, eroding efforts to build healthy, sustainable and equitable societies. Power relations and inequities experienced by people because of social markers, e.g., gender, age, education, ethnicity, and race, intersect leading to poverty and associated health challenges. Concurrent to the growing body of literature exploring the impact of these intersecting axes of inequity in FASP settings, there is a need to identify actions promoting gender, equity, and justice (GEJ). Gender norms that emphasise toxic masculinity, patriarchy, societal control over women and lack of justice are unfortunately common throughout the world and are exacerbated in FASP settings. It is critical that health policies in FASP settings consider GEJ and include strategies that promote progressive changes in power relationships. ReBUILD for Resilience (ReBUILD) focuses on health systems resilience in FASP settings and is underpinned by a conceptual framework that is grounded in a broader view of health systems as complex adaptive systems. The framework identifies links between different capacities and enables identification of feedback loops which can drive or inhibit the emergence and implementation of resilient approaches. We applied the framework to four different country case studies (Lebanon, Myanmar, Nepal and Sierra Leone) to illustrate how it can be inclusive of GEJ concerns, to inform future research and support context responsive recommendations to build equitable and inclusive health systems in FASP settings.

14.
J Craniomaxillofac Surg ; 50(12): 873-883, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36681615

RESUMO

The aim of this study was to evaluate the clinical outcomes of linear and orbital volume measurements in severe orbital trauma. Patients with severe orbital trauma that involved more than two walls and entailed a marked degree of comminution were included in this retrospective analysis. However, patients with incomplete clinical records and a simple blowout or zygmatico-orbital fractures were excluded. All the cases underwent surgical correction guided by virtual surgical planning and 3D-printed templates. The measurement protocol depended on assessing orbital dimensions, orbital volumetry, and the zygomatic bone's position in the three-dimensional planes. All patients' preoperative 3D CT scans were obtained, and DICOM files were imported into a three-dimensional image processing software. Data were then converted for 3D reconstruction in the axial, coronal, and sagittal views. A total of 18 patients with a mean age was 39.28 ± 6.28 were included in this study. The results revealed a significant difference between the pre and postoperative differences in distances in relation to the FHP (Frankfurt Horizontal Plane) (P = 0.0014) and sagittal planes (P < 0.0001). The orbital width and height of the traumatized orbit were significantly decreased from 45.26 ± 6.72 mm and 45.30 ± 2.89 mm to 39.74 ± 3.91 mm (P = 0.0022), and 40.34 ± 0.86 mm (P < 0.0001), respectively. Clinically, there was a satisfactory degree of symmetry regarding the zygomatic bones' position and orbital dimensions postoperatively. Moreover, the mean orbital volume on the traumatized side decreased significantly from 23.16 ± 1.91 cm3 preoperatively to 20.7 ± 1.96 cm3 postoperatively (P < 0.0001). These findings were associated with a low incidence of complications. Within the limitations of the study it seems that the described methodology is a relevant addition to clinical treatment options. It incorporates all the latest technology to plan virtual reconstruction surgery in the treatment of complex orbital trauma and should be adapted accordingly in cases of severe displacement and comminution.


Assuntos
Órbita , Fraturas Orbitárias , Cirurgia Assistida por Computador , Adulto , Humanos , Pessoa de Meia-Idade , Computadores , Órbita/diagnóstico por imagem , Órbita/cirurgia , Fraturas Orbitárias/diagnóstico por imagem , Fraturas Orbitárias/cirurgia , Estudos Retrospectivos , Software , Zigoma/cirurgia
16.
Artigo em Inglês | MEDLINE | ID: mdl-34093002

RESUMO

BACKGROUND: Assessment of multiple sclerosis (MS) patients during the era of the coronavirus disease 2019 (COVID-19) pandemic was confronted with the overwhelmed healthcare facilities in Egypt and fear of the patients to get infected while attending the follow-up visits. This study aimed to assess the value of telephone-based assessments in the follow-up of MS patients. It includes one hundred and five patients who participated in the study and completed 3 telephone-based assessments which are the Hauser Ambulation index, Multiple Sclerosis Neuropsychology Questionnaire (MSNQ), and Symptoms of Multiple Sclerosis Scale (SMSS). RESULTS: The Hauser Ambulation index was significantly correlated with the latest Expanded Disability Status Scale (EDSS) score done within 1 month from the telephone call (r=0.738, P<0.001). The analysis of MSNQ scores showed that one-third of the study population had evidence of cognitive and/or neuropsychological impairment. Post hoc analysis regarding the cognitive and psychological impairment component of SMSS revealed that the patients who answered "Never" had significantly lower MSNQ scores compared to those who answered "Sometimes" (P=0.016), "Often" (P=0.022), and "Always" (P=0.001). The comparison of the EDSS scores of the patients regarding the sensory-motor impairment component of SMSS showed a non-significant difference. CONCLUSION: The Hauser Ambulation index may be a reliable telephone-based tool for the assessment of physical disability. The MSNQ and the cognitive and psychological impairment component of SMSS can be used for the assessment of cognitive and psychological impairment among patients with MS.

17.
Eye Contact Lens ; 47(11): 611-616, 2021 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-33870929

RESUMO

PURPOSE: To report on the changes in the natural crystalline lens in primary congenital glaucoma (PCG) eyes that had undergone previous combined angle-filtering surgery with antimetabolites. SETTINGS: The pediatric ophthalmology unit of the ophthalmology department of Alexandria Main University Hospital. DESIGN: A retrospective chart review. METHODS: A retrospective chart review of patients presenting with and operated (by combined angle-filtering surgery with antimetabolites) for PCG in the period from 2005 to 2018. Any lens pathology was noted as well as the management and the outcome. RESULTS: The records of 422 children (613 eyes) were reviewed. Lens pathology was noted in 54 (8.8%) eyes. Abnormalities in lens clarity (cataract) were detected in 31 (56%) eyes, and abnormalities in lens position (subluxation) were detected in 24 (44%) eyes. Management options included observation (in 28 eyes), lensectomy for aphakia (in 14 eyes), lensectomy with in the bag intraocular lens (IOL) implantation (in 11 eyes), and lensectomy with iris-fixated IOL (in 1 eye). Elevation of intraocular pressure (IOP) occurred in only 4 eyes (of 26 operated eyes, 15.3%) after lens extraction. CONCLUSIONS: Changes in the natural crystalline lens clarity and/or position occurred in 8.8% (54 of 613) of PCG eyes operated by combined angle-filtering surgery with antimetabolites. Lens extraction was a relatively safe procedure with only 15% (4 of 26) of eyes suffering an elevation of IOP after lens extraction.


Assuntos
Extração de Catarata , Catarata , Cirurgia Filtrante , Glaucoma , Cristalino , Lentes Intraoculares , Criança , Glaucoma/etiologia , Glaucoma/cirurgia , Humanos , Pressão Intraocular , Implante de Lente Intraocular , Estudos Retrospectivos , Acuidade Visual
18.
Onco Targets Ther ; 14: 609-621, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33519209

RESUMO

INTRODUCTION: Quiescent leukemia stem cells (LSCs) play a major role in therapeutic resistance and disease progression of chronic myeloid leukemia (CML). LSCs belong to the primitive population; CD34+CD38-Lin-, which does not distinguish normal hematopoietic stem cells (HSC) from CML LSCs. Because Thomsen-Friedenreich/CD176 antigen is expressed on CD34+ HSC and IL1RAP is tightly correlated to BCR-ABL expression, we sought to increase the specificity towards LSC by using additional biomarkers. METHODS: We evaluated the co-expression of both antigens on CD34+ peripheral blood mononuclear cells (PBMCs) from both healthy volunteers and CML patients, using flow cytometry. Then, we used site-directed mutagenesis to induce knob-in-hole mutations in the human IgG heavy chain and the human lambda light chain to generate the bi-specific antibody (Bis-Ab) TF/RAP that binds both antigens simultaneously. We measured complement-directed cytotoxicity (CDC) in CML samples with the Bis-Ab by flow cytometry. RESULTS: In contrast to healthy volunteers, CML samples displayed a highly significant co-expression of CD176 and IL1RAP. When either a double-positive cell line or CML samples were treated with increasing doses of Bis-Ab, increased binding and CDC was observed indicating co-operative binding of the Bis-Ab as compared to monoclonal antibodies. DISCUSSION: These results show that the bi-specific antibody is capable of targeting IL1RAP+ and CD176+ cell population among CML PBMCs, but not corresponding normal cells in CDC assay. We hereby offer a novel strategy for the depletion of CML stem cells from the bulk population in clinical hematopoietic stem cell transplantation.

19.
J Hazard Mater ; 402: 123514, 2021 01 15.
Artigo em Inglês | MEDLINE | ID: mdl-32717546

RESUMO

We selected ruthenium (Ru) to improve the photocatalytic activity of a WO3/ZrO2 composite. The synthesized Ru/WO3/ZrO2 was then compared to a benchmark photocatalyst (S-TiO2) in terms of photocatalytic disinfection of raw surface waters collected from the Nile Delta region, Egypt. The photocatalysts were immobilized on aluminum plates with polysiloxane to test them in repetitive cycles under the irradiation of a metal-halide lamp. Bacterial concentrations in the raw waters ranged from 300 to 5000 CFU/mL (CFU: colony-forming units) and different species and genus were detected including gram-negative (e.g., shigella, salmonella, vibrio parahaemolyticus, and vibrio cholera) and gram-positive bacteria (e.g., enterococcus). Ru/WO3/ZrO2 deactivated over 90 % of the bacterial content within 120 min for most sources, whereas S-TiO2 did not perform as highly. The bacterial count after 240 min of irradiation was below the detection limit for all different water sources. Moreover, the inhabitation of photocatalytic disinfection by natural organic matter (NOM) was investigated. Ru/WO3/ZrO2 was stable for four continuous cycles (960 min in total), suggesting the viability for practical application.


Assuntos
Desinfecção , Rutênio , Catálise , Luz , Titânio
20.
Egypt J Immunol ; 27(1): 77-86, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33180390

RESUMO

The study aimed at comparing the diagnostic performances of CRP, PCT and CD11b in neonatal sepsis and evaluating the effectiveness of the sepsis score system when using a combination of various biomarkers. The study was conducted on 90 neonates divided into 3 equal groups; a group with proven sepsis, suspected sepsis and healthy newborns. All were subjected to measurement of CPR by Latex agglutination, serum Procalcitonin by ELISA and CD11b by flow cytometry. On comparing the three biomarkers; PCT (Serum procalcitonin) was associated with the highest (AUC) area under the curve followed by CD11b and CRP recording the smallest value. However, the AUC of the combined sepsis score was much higher than individual biomarkers. Although the sensitivity of individual biomarkers from procalcitonin to CD11b and lastly CRP but the sensitivity and specificity of the sepsis score showed higher values compared to those of individual biomarkers. In conclusion, the study demonstrate that combination of CRP, CD11b and, procalcitonin can enhance diagnostic discriminative power over traditional tests and overcome the drawbacks of each test alone with greater diagnostic accuracy.


Assuntos
Proteína C-Reativa/análise , Antígeno CD11b/análise , Sepse Neonatal , Pró-Calcitonina/análise , Biomarcadores/análise , Humanos , Recém-Nascido , Sepse Neonatal/diagnóstico , Curva ROC , Sensibilidade e Especificidade
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