Characterization of the Anti-HLA Class I and II IgG Antibodies in Moroccan IVIg Using Regular Beads and Ibeads in Luminex Multiplex Single Antigen Immunoassay
Fatiha EL Hilali,
Vadim Jucaud,
Hajar EL Hilali,
Mohammed Hassan Bhuiyan,
Andrew Mancuso,
Nancy LiuSullivan,
Abdeslem Elidrissi,
Hamid Mazouz
Issue:
Volume 5, Issue 4, August 2017
Pages:
53-65
Received:
15 May 2017
Accepted:
23 May 2017
Published:
18 July 2017
Abstract: Therapeutic Immunoglobulin Intravenous (IVIg), approved to treat a wide range of autoimmune and primary immunodeficiency diseases, contain mixture of polyreactive and polyclonal IgG purified from the pooled plasma of thousands of donors. The aim of this study is to characterize the profiles of anti- Human Leukocyte Antigen (HLA) class-I and class-II IgG antibodies in four lots of Moroccan IVIg preparations using Luminex Multiplex Single Antigen Bead Immunoassay and to compare it with the unique high frequency HLA types found in the Moroccan population. Anti-HLA class I IgG profiles were assessed using regular (Labscreen) Beads and iBeads. The regular beads are coated with all conformational and structural variants of HLA-I (HLA heavy chain (HC) with β2-microglobulin (β2m) with or without peptides, β2m-free HC with or without peptides or HC only), quite contrast to iBeads, which contained only native tissue-associated HLA HC with β2m and with or without peptides. The level of antibodies was measured as Mean Fluorescent Intensity (MFI). The reactivity of anti-HLA-I IgG antibodies to different alleles of HLA-I loci differed in their recognition of native HLA-I and other structural variants of the HLA-I. High MFI IgG antibodies in the IVIg corresponded with several high frequency HLA-I alleles (B*0801, B*5001, Cw*0602 and Cw*0702) and HLA-II haplotypes (DQA1*0201-DQB1*0201/DRB1*0301), which accounted for 50% of the total gene frequencies in the Moroccan population. HLA-I reactivity of the IVIg with iBeads confirms that the IgG reacting to normal tissue associated with peptide -associated or -free β2mHC. These findings caution the use of high dose IVIg for the carriers of the high frequency HLA types for it may cause tissue injury. The β2m-free-HC reactivity of IVIg indicates the potential of IVIg to bind to activated T and B cells that express these variants, to suppress antibody production. Such an immunomodulation by IVIg renders benefit for patients with autoimmune diseases and organ transplantation.
Abstract: Therapeutic Immunoglobulin Intravenous (IVIg), approved to treat a wide range of autoimmune and primary immunodeficiency diseases, contain mixture of polyreactive and polyclonal IgG purified from the pooled plasma of thousands of donors. The aim of this study is to characterize the profiles of anti- Human Leukocyte Antigen (HLA) class-I and class-I...
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CTLA-4, ICOS, PD1 and PTPN22 Gene Polymorphisms and Susceptibility to Autoimmune Hepatitis Type 1
María Del Pilar Fortes,
Paolo Tassinari,
Irma Machado
Issue:
Volume 5, Issue 4, August 2017
Pages:
66-73
Received:
30 June 2017
Accepted:
10 July 2017
Published:
10 August 2017
Abstract: Autoimmune hepatitis type 1 (AIH-1) is a progressive inflammatory liver disorder in which HLA Class II gene polymorphism prevails as the most important genetic risk. However, other gene polymorphisms have been associated with this disease. The single nucleotide polymorphisms of four candidate genes (CTLA-4 +49A/G, ICOS c.1564 T/C, PD1.3 G/A, PTPN22 1858C/T) were selected in this study. One-hundred and ninety (190) mestizo Venezuelan unrelated individuals grouped in AIH-1 patients (n=70) and healthy subjects (n=120) were evaluated. Our results showed significantly increased frequency of the PTPN22 1858 C/T (p= 0.0014; pc= 0.0042; OR= 8.7; 99%CI: 1.82-41.54) and ICOS c.1564 T/C (p= 0.070; pc=0.21; OR= 2.08; 95%CI: 1.09-3.93) genotypes in the patient population compared to control group. There was no significant association between CTLA-4 +49A/G and PD1.3 G/A genotypes in both groups. In addition, the PTPN22 1858C/T polymorphism was associated to cirrhosis, treatment relapse, increased IgG levels and co-existence of other autoimmune diseases. Furthermore, the ICOS c.1564 T/C polymorphism was related to higher levels of globulins, IgG and presence of ANA. Conclusion: this data suggest for the first time, that PTPN22 1858 C/T and ICOS c.1564 T/C gene polymorphisms are associated with the development of AIH-1.
Abstract: Autoimmune hepatitis type 1 (AIH-1) is a progressive inflammatory liver disorder in which HLA Class II gene polymorphism prevails as the most important genetic risk. However, other gene polymorphisms have been associated with this disease. The single nucleotide polymorphisms of four candidate genes (CTLA-4 +49A/G, ICOS c.1564 T/C, PD1.3 G/A, PTPN22...
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The Expression Patterns of Some Pro-inflammatory and Anti-inflammatory Cytokines Genes Pre and Post Acute Exercise
Ehiaghe Friday Alfred,
Onyenekwe Charles Chinedum,
Ifeanyichukwu Martins,
Akosile Christopher Olusanjo,
Ehiaghe Imuetiyan Joy,
Nancy Ibeh Chitogu,
Ukibe Nkiruka Rose,
Osakue Nosa,
Ekpe Elijah Chukwuemeka
Issue:
Volume 5, Issue 4, August 2017
Pages:
74-79
Received:
3 July 2017
Accepted:
18 July 2017
Published:
11 August 2017
Abstract: This study was designed to determine the expression patterns of some pro-inflammatory and anti-inflammatory cytokine genes in some young male undergraduates that passed through exhaustive exercise using the Bruce protocol for sub-maximal acute exercise as studies have shown that exhaustive exercise activates the release of multiple cytokine genes which modulate the immune responses of stressed individuals. Twenty five (25) healthy young male undergraduates with an average age of 24.3±3 years and body mass index of 22.7±1.8 (Kg/m2) participated fully in the study. Blood samples were collected from the participants before commencement of the study, at 1 hour, 4 hours and 24 hours post exercise. Tumor necrosis factor α, interferon gamma and interleukin-10 genes expression patterns were detected using reverse transcriptase polymerase chain reaction methods. Serum cortisol (nmol/L) using enzyme-linked immunosorbent assay method. The study revealed that eleven (11) out of the twenty-five (25) participants had their tumor necrosis factor α genes up-regulated at 1 hour post exercise and sustained till 24 hours post exercise. Moreover, interferon gamma and interleukin-10 genes were up-regulated at 4 hours post exercise and sustained till 24 hours post exercise in most of the subjects. This study also observed that the cortisol level of the exercised subjects was significantly higher at 1 hour post acute exercise when compared with pre-exercise stage. Acute exercise was associated with an enhanced lymphocytic cell functions which are evidence in the up-regulation patterns of both lymphocytic pro-inflammatory cytokine and anti-inflammatory cytokine genes post exercise.
Abstract: This study was designed to determine the expression patterns of some pro-inflammatory and anti-inflammatory cytokine genes in some young male undergraduates that passed through exhaustive exercise using the Bruce protocol for sub-maximal acute exercise as studies have shown that exhaustive exercise activates the release of multiple cytokine genes w...
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