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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Phototherapy and DNA changes in full term neonates with hyperbilirubinemia
Egyptian Journal of Medical Human Genetics, Volume 13, No. 1, Year 2012
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Description
Background: Phototherapy has remained the standard therapeutic approach for neonatal hyperbilirubinemia. Oxidative effects of phototherapy on cell membranes and cell components may have a wide range of potential adverse effects, including enhanced lipid peroxidation and DNA damage. Apoptosis is an indispensable mechanism for maintaining many cellular functions, including cell replication, and removal of damaged cells with high burden of genetic mutations. Many genes function as apoptosis regulatory genes. Examples of these genes include the BCL2 gene which is an anti-apoptotic oncogene, and the BAX gene which acts as a promoter of apoptosis. Objectives: Assess the effect(s) of phototherapy on DNA and on the rate of apoptosis in full term neonates with hyperbilirubinemia. It comprised 35 neonates with indirect hyperbilirubinemia who received phototherapy for 48. h, and 20 apparently healthy full term neonates with normal serum bilirubin level, as a control group. DNA damage was assessed by DNA fragmentation and micronucleus assay. Determination of the anti-apoptotic effect(s) of BCL2 gene was achieved by quantitative assay of its product, (BCL2) protein, by ELISA and BAX gene expression status was assessed by PCR. Results: The frequency of micronuclei in circulating lymphocytes of neonates who received phototherapy has significantly increased before and after phototherapy compared to controls, (p< 0.001; p< 0 0.00001), respectively. DNA fragmentation in circulating lymphocytes, was significantly higher among cases before and after phototherapy compared to controls (p< 0.0001; p< 0 0.00001). The plasma BCL2 protein was significantly lower in the cases before and after phototherapy compared to controls (p< 0.01; p< 0.01), respectively, and BAX gene expression was significantly high among cases before and after phototherapy compared to controls. Conclusions: Geno toxic effects of bilirubin and phototherapy, induce more DNA damage and enhances apoptosis of exposed cells, probably through down regulation of BCL2 expression and upregulation of BAX gene expression in neonates with hyperbilirubinemia. © 2012 Production and hosting by Elsevier B.V.
Authors & Co-Authors
El-Abdin, Maha Youssif Zein
Egypt, Cairo
Faculty of Medicine
El-Salam, Manal Abd
Egypt, Cairo
Faculty of Medicine
Ibrhim, Mona Yousri
Egypt, Cairo
Faculty of Medicine
Koraa, Soheir S.M.
Egypt, Cairo
National Center for Radiation Research and Technology
Mahmoud, Enas
Egypt, Cairo
Faculty of Medicine
Statistics
Citations: 17
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1016/j.ejmhg.2011.11.003
e-ISSN:
20902441
Research Areas
Cancer
Environmental
Genetics And Genomics
Maternal And Child Health
Study Design
Randomised Control Trial
Study Approach
Quantitative