Export 32 results:
Sort by: Author Title Type [ Year  (Asc)]
ElBeshlawy, A., H. G. Metwally, R. A. Zayed, S. M. Mousa, and H. R. F, "The Effect of Freezing on the Recovery and Expansion of Umbilical Cord Blood Hematopoietic Stem Cells", Exp Clin Transplant., vol. 7, issue 1, pp. 50-55, 2009.
Omran, N., Azza M. Ibrahim, H. H. Abou-Elew, and R. A. Zayed, Molecular Detection of Intron 22 Inversion of Factor VIII Gene in Egyptian Hemophilia A Patients, , 2009.
Eyada, T. K., M. A. K. E. Din, M. M. Khorshied, and R. A. Zayed, PRAME and WT1 Genes expression in Chronic Myeloid Leukemia Patients: Clinical Importance and Future Prospects, , 2009.
EL-BELTAGY, M. O. H. A. M. A. D., A. H. M. A. D. ALY, H. Gabr, R. Zayed, E. H. S. A. N. E. L. GONEIMY, N. E. V. I. N. E. FOUAD, and A. H. M. A. D. ISSA, "Adjuvant Dendritic Cell-Based Tumor Vaccination for Patients with Malignant Glioma", Med. J. Cairo Univ., vol. 78, issue 1, pp. 253-258, 2010.
Zayed, R. A., E. Rushdy, and D. ’aA. Saleh, "Detection of HCV RNA in the Peripheral Blood Mononuclear Cells of Serum HCV RNA Negative Egyptian Patients under Interferon Treatment.", Am J Med Sci., vol. 340, issue 6, pp. 435-438, 2010. Abstract

Despite recent success after the introduction of combination therapy with interferon (IFN)-α and ribavirin, approximately 60% of patients with hepatitis C virus (HCV) genotype 4 fail to respond. Resistance to antiviral therapy remains a serious problem in the management of chronic hepatitis C. In most patients, HCV RNA could be detected in peripheral blood mononuclear cell (PBMC).
The authors aimed to investigate the predictive value of HCV RNA in PBMC of patients with chronic hepatitis C after IFN treatment, which may act as the source of HCV reinfection of hepatic cells.
Seventy patients with chronic hepatitis C were treated with IFN plus ribavirin for 48 weeks; they all achieved clearance of HCV RNA from serum. At the end of treatment, PBMC and serum were examined by real-time polymerase chain reaction for detection of HCV RNA. Six months later, HCV RNA in serum was monitored to detect sustained virologic response.
: Analysis revealed the presence of detectable HCV RNA in the PBMC of 27% of patients despite clearance of serum HCV RNA. During follow-up, 80% of the patients who became serum HCV positive 6 months after the end of treatment had detectable level of HCV RNA in PBMC at the end of treatment.
The absence of HCV in the serum of patients by the end of treatment does not exclude future viremia. The patient might still be a source of infection to others. It is strongly encouraged to test for HCV in PBMC to detect lack of response to treatment and persisting infection.

Zayed, R. A., H. F. Sheba, M. A. A. K. Elazaem, Z. A. Elsaadany, L. O. Elmessery, J. A. Mahmoud, D. A. R. Rahman, and F. R. Abdou, "B- Cell Activating Factor Promoter Polymorphisms in Egyptian Patients with Systemic Lupus Erythematosus.", Annals of Clinical & Laboratory Science, vol. 43, issue 3, pp. 111-116, 2013. Abstract

Background: Systemic lupus erythematosus (SLE) is a heterogonous autoimmune disease involving
most immune cells. Studies have revealed a number of cytokine pathways that play important roles in
the disease process. Among these are B- cell activating factor (BAFF), which regulates B-cell maturation,
survival, and function. Objective: To study the association between BAFF promoter polymorphism and
systemic lupus erythematosus (SLE). Methods: Single nucleotide polymorphisms in the BAFF promoter
region; -2841 (T>C), -2701 (T>A), -871 (C>T) were investigated by PCR-RFLP genotyping in fifty Egyptian
SLE patients and thirty normal controls. Results: The frequency of mutant alleles of both -871C>T
and -2701 T>A was higher among SLE patients than controls (p-value <0.001 and 0.000 respectively).
There was a highly significant relationship between -871 C>T polymorphism and SLE (P<0.001), with the
sensitivity and the specificity of the test being 100 %, and 70%, respectively. Patients expressing the -2701
T>A allele were seven times more prone to SLE than those with the T/T wild genotype (sensitivity of the
test = 78%, specificity = 66.7%, odds ratio = 7.09, C.I at 95% = 2.29-22.64). Conclusion: Polymorphisms
in the regulatory region of the BAFF gene do contribute to the susceptibility to SLE in Egyptian patients,
which indicates BAFF as a potential therapeutic target.

Gabr, H., R. Zayed, and A. R. Elzayat, "Comparison between Different Cord Blood Stem Cell Populations in Efficiency of Transdifferentiation into Hepatic Lineage.", 1st Annual International Interdisciplinary Conference, AIIC, Azores, Portugal, ESI, pp. 762-768, 2013. Abstract

Background: Cord blood is established as a source of stem cells for hemopoeitic reconstitution. Cord
blood transplants have been performed for more than 20 years now. However, cord blood stem cells
as a source for regenerative medicine is still under trial. The availability of cord blood and its banking
facilities make it a very useful source of hepatocytes for support of endstage liver disease. Cord blood
contains a number of stem cell subsets: CD34+, CD133+, and mesenchymal stem cells (MSCs).
Objectives: This study was conducted to compare between these subsets in hepatocyte
transdifferentiation efficiency. Hepatocyte lineage commitment was evaluated by alpha-fetoprotein
(AFP) expression and albumin synthesis.
Methods: Cord blood is assayed for viability. Magnetic separation was done for CD34+ve, CD133+ve
populations, MSCs were separated by culture on plastic flasks. Each cell fraction (CD34+ve,
CD133+ve and MSCs) was cultured in liquid culture containing hepatocyte growth factor for 7 days.
AFP expression was done using immunocytochemistry, albumin synthesis was measured in culture
supernatant using microalbumin assay kit.
Results: All three populations showed heptocyte transdifferentiation; although with varying
percentages. There was no statistically significant difference in AFP expression with MSCs showing
31% positivity, CD133+ve30% followed by CD34+ve showing 28.8%. Also, MSCs population
showed the highest albumin synthesis levels, followed by CD34+ then CD133+ cells.
Conclusion: Induction of hepatocyte-like cells is possible with all three stem cell subsets of the cord
blood. However, establishment of functional hepatic cells is higher in MSCs population.

Omran, D., S. Hamdy, S. Tawfik, S. Esmat, D. ’aA. Saleh, and R. A. Zayed, "Association of Interferon-γ Inducible Protein-10 Pretreatment Level and Sustained Virological Response in HCV-Positive Egyptian Patients.", Annals of Clinical & Laboratory Science, vol. 44, issue 2, pp. 169-174, 2014. Abstract

Background. The response to antiviral therapy in HCV infected patients depends on several
predictive factors; however, the ability to achieve sustained virological response is still limited to around
60% of the patients infected with the HCV-4 genotype. Increased serum and intrahepatic interferon -γ
inducible protein 10 (IP-10) levels in patients with chronic hepatitis C have been described. The aim of
the work was to study the impact of pretreatment serum IP-10 level on the antiviral treatment outcome
in a group of Egyptian patients infected with HCV. Materials and methods. The study included 80 treatment
naive HCV patients. Serum IP-10 levels were determined by an enzyme linked immunosorbent assay
before therapy was introduced. Serum samples were examined twice by Real-Time PCR after complete
course of therapy for detection of HCV RNA; at the end of the antiviral therapy and six months later to
detect sustained virological response (SVR). Results. 57 patients (71%) achieved SVR while 23 (29%) patients were non-responders (NR). Pretreatment serum IP-10 levels were significantly lower in patients who achieved SVR than in NR (p=0.000). Conclusion. Low pretreatment serum IP-10 is a favorable predictive of response to antiviral HCV therapy in Egyptian patients.

Gabr, H., R. Zayed, A. ElBeshlawy, L. Hegazy, R. Fawzy, M. Samir, and H. Mosa, "Differentiation of bone marrow hematopoietic stem cells into FVIII-producing hepatocytes: approach to hemophilia treatment", Comp Clin Pathol , vol. 23, pp. 193-198, 2014. Abstract

Hemophilia is caused by a single-gene defect resulting in familial bleeding disorder. Small increase in
gene products could transform a severe form of hemophilia into a mild one. Stem cells from extrahepatic sources are being considered for clinical applications in liver cell therapy as they possess high in vitro culture potential and could be used in transplant procedures. We studied the differentiation
of bone marrow hemapoietic stem cells (BM-HSCs) from hemophilia patients' relatives into FVIII-producing hepatocytes aiming to expand patients' donor options for partial replacement of mutant liver cells by healthy cells in hemophilia A patients which could manage the severity of the bleeding disorder. BM-HSCs from hemophilic families were cultured in liquid culture containing hepatocyte growth factor for 6 days. Differentiation into hepatocytes was evaluated by alpha-fetoprotein (AFP) expression using mmunocytochemistry. Functional evaluation of transdifferentiation into hepatic lineage was done through albumin synthesis in culture supernatant using microalbumin assay kit, factor VIII activity by one stage clotting assay and expression of FVIII mRNA by RT-PCR. BM-HSCs-derived hepatocytes showed positive
AFP expression with a mean of 11 %. Functional tests performed showed their ability to produce albumin and perform FVIII activity. Also, FVIII mRNA expression was detected. Inducing the differentiation of BM-HSCs by in vitro manipulation may become a valuable tool to provide a cell source for hepatocyte transplant procedures for treatment of hemophilia patients.

El-Bassiouni, N. E., E. L. O. Messery, R. A. Zayed, O. B. Metwally, M. Y. Zahran, O. M. Mahmoud, R. A. Ibrahim, and E. A. E. Bassiouny, "Tissue factor expression on blood monocytes in patients with hepatitis C virus-induced chronic liver disease", Comp Clin Pathol , vol. 23, pp. 1159-1166, 2014. Abstract

Chronic liver disease (CLD) is a worldwide common pathology characterised by an inflammatory and fibrotic process leading to progressive evolution from chronic hepatitis to cirrhosis.Monocytes play a crucial role in the pathogenesis of inflammation and fibrosis in chronic liver diseases. Activated monocytes increase the expression of tissue factor, a key glycoprotein that participates in haemostatic and nflammatory processes. This study aims to assess the expression of tissue factor on activated peripheral blood monocytes in patients with hepatitis C virus (HCV)-induced CLD in relation to the degree of hepatic insufficiency and haemostatic imbalance. The current study included 60 patients with HCV induced
CLD, categorised after Child–Pugh into four groups: Child A, B, C and C during acute attack of haematemesis, 15 patients each, and 15 healthy subjectswere included as normal controls. Immunophenotype characterization was carried out by flow cytometric analysis for identification of monocytes tissue factor expression (CD142) on activated blood monocytes population (CD11b and CD14) in different groups studied. Data demonstrated significant increase (p<0.05) in the expression of each of CD11b, CD14 and CD142 revealing monocytes activation and increased expression of tissue factor
on peripheral blood monocytes in different groups of patients especially cases during acute attack of haematemesis, compared to healthy subjects. Increased monocytes tissue factor expression in patients with HCV may play a key role in the intensification of the inflammatory and immunological processes
in conjunction with activation of the coagulation mechanisms. The interaction of all these phenomena may trigger bleeding by perturbing the unstable haemostasis in frail patients with chronic liver disease.

Zayed, R. A., M. El-Ghamrawy, H. A. Alwakeel, and N. Esh, "Impact of circulating erythrocyte-derived microparticles on coagulation activation in sickle cell disease", Comparative Clinical Pathology, vol. 24, issue 5, pp. 1123-1128, 2015.
Gabr, H., and R. A. Zayed, "Mesenchymal Stem Cell Infusion in Chronic Renal Failure Patients", Journal of Medical and Bioengineering, vol. 4, issue 4, pp. 329-331, 2015.
Zayed, R. A., S. M. Abdel-Hamid, and H. El-Lithy, "The association of cytokine genes polymorphisms and susceptibility to aplastic anemia in Egyptian patients", Hematology, vol. 21, issue 2, pp. 106-112, 2016.
Mansour, I., R. A. Zayed, F. Said, and L. A. Latif, "Indoleamine 2,3-dioxygenase and regulatory T cells in acute myeloid leukemia", Hematology, vol. 21, issue 8, pp. 447-453, 2016.
Zayed, R. A., D. Omran, D. A. Mokhtar, Z. ZAKARIA, S. Ezzat, M. A. Soliman, L. Mobarak, H. El-Sweesy, and G. Emam, "Association of Toll-Like Receptor 3 and Toll-Like Receptor 9 Single Nucleotide Polymorphisms with Hepatitis C Virus Infection and Hepatic Fibrosis in Egyptian Patients.", Am J Trop Med Hyg., vol. 96, issue 3, pp. 720-726, 2017.
Zayed, R. A., D. Omran, A. A. Zayed, and L. O. Elmessery, "Determinants of Infection Outcome in HCV-genotype 4", Viral Immunology, vol. 30 , issue 8, pp. 560-567, 2017.
Zayed, R. A., M. A. Eltaweel, S. K. Botros, and M. A. Zaki, "MN1 and PTEN gene expression in acute myeloid leukemia", Cancer Biomarkers, vol. 18, issue 2, pp. 177-182, 2017.
Zayed, R. A., S. A. Elhamid, and D. Khamess, "The Association of Transforming Growth Factor-β1 (TGF-β1) Gene Polymorphism and Susceptibility to Aplastic Anemia in Egyptian Patients", International Journal of Pharmaceutical and Clinical Research, vol. 10, issue 11, pp. 249-251, 2018. the_association_of_transforming_growth_factor-b1_tgf-b1_gene.pdf
Omran, D., A. Yosry, S. K. Darweesh, M. M. Nabeel, M. El-Beshlawey, S. Saif, A. Fared, M. Hassany, and R. A.Zayed, "Enhanced liver fibrosis test using ELISA assay accurately discriminates advanced stage of liver fibrosis as determined by transient elastography fibroscan in treatment naı¨ve chronic HCV patients", Clin Exp Med, vol. 18, issue 1, pp. 45-50, 2018.
Omran, D., R. A. Zayed, M. M. Nabeel, L. Mobarak, Z. Zakaria, A. Farid, M. Hassany, S. Saif, M. Mostafa, O. K. Saad, et al., "Evaluating Diagnostic Accuracy of Noninvasive Tests in Assessment of Significant Liver Fibrosis in Chronic Hepatitis C Egyptian Patients", Viral Immunol. , vol. 31, issue 4, pp. 314-320, 2018.
Attallah, A. M., D. Omran, M. M. Omran, M. A. Abdelrazek, R. Zayed, R. E. Essawey, S. Saif, A. Farid, M. Hassany, A. Yosry, et al., "Extracellular Matrix Proteins Substantiate IL-28B T allele Effect on Histological Outcome of Chronic Hepatitis C", Ann Hepatol. , vol. 17, issue 4, pp. 569-576, 2018.
Attallah, A. M., D. Omran, M. M. Omran, M. S. Albannan, R. A. Zayed, S. Saif, A. Farid, M. Hassany, and A. Yosry, "Fibro-Mark: a panel of laboratory parameters for predicting significant fibrosis in chronic hepatitis C patients", Br J Biomed Sci., vol. 75, issue 1, pp. 19-23, 2018.
Omran, D., M. Alboraie, R. A. Zayed, M. - N. Wifi, mervat naguib, M. Eltabbakh, M. Abdellah, A. F. Sherief, S. Maklad, H. H. Eldemellawy, et al., "Towards hepatitis C virus elimination: Egyptian experience, achievements and limitations", World J Gastroenterol , vol. 24, issue 38, pp. 4330-4340, 2018.
Abou-Elew, H. H., I. Youssry, S. Hefny, R. H. Hashem, N. E. V. I. N. E. FOUAD, and R. A. Zayed, "βS globin gene haplotype and the stroke risk among Egyptian children with sickle cell disease", Hematology, vol. 23, issue 6, pp. 362-367, 2018.
Wifi, M. - N., R. A. Zayed, N. E. V. I. N. E. FOUAD, ahmed y hassan, M. A. Hussien, and M. G. Sokar, "Association of serum growth differentiation factor 15 and hepatocellular carcinoma in Egyptian patients", The Egyptian Journal of Internal Medicine, vol. 31, pp. 57-63, 2019.