Expression of activation-induced cytidine deaminase gene in B lymphocytes of patients with common variable immunodeficiency.

Abstract:

OBJECTIVE:Common variable immunodeficiency (CVID) is a heterogeneous disorder characterized by reduced serum level of IgG, IgA or IgM and recurrent bacterial infections. Class switch recombination (CSR) as a critical process in immunoglobulin production is defective in a group of CVID patients. Activation-induced cytidine deaminase (AID) protein is an important molecule involving CSR process. The aim of this study was to investigate the AID gene mRNA production in a group of CVID patients indicating possible role of this molecule in this disorder. METHODS:Peripheral blood mononuclear cells (PBMC) of 29 CVID patients and 21 healthy controls were isolated and stimulated by CD40L and IL-4 to induce AID gene expression. After 5 days AID gene mRNA production was investigated by real time polymerase chain reaction. FINDINGS:AID gene was expressed in all of the studied patients. However the mean density of extracted AID mRNA showed higher level in CVID patients (230.95±103.04 ng/ml) rather than controls (210.00±44.72 ng/ml; P=0.5). CVID cases with lower level of AID had decreased total level of IgE (P=0.04) and stimulated IgE production (P=0.02); while cases with increased level of AID presented higher level of IgA (P=0.04) and numbers of B cells (P=0.02) and autoimmune disease (P=0.02). CONCLUSION:Different levels of AID gene expression may have important roles in dysregulation of immune system and final clinical presentation in CVID patients. Therefore investigating the expression of AID gene can help in classifying CVID patients.

journal_name

Iran J Pediatr

authors

Abolhassani H,Farrokhi AS,Pourhamdi S,Mohammadinejad P,Sadeghi B,Moazzeni SM,Aghamohammadi A

subject

Has Abstract

pub_date

2013-08-01 00:00:00

pages

451-7

issue

4

eissn

2008-2142

issn

2008-2150

journal_volume

23

pub_type

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