ABSTRACT
Aims: Glutamate cysteine ligase (GCL) enzyme is involved in the synthesis of glutathione, which functions as an antioxidant. Polymorphisms in the sequence of amino acids making up the gene GCLC will cause differences in enzyme expression and GCLC activity. Gene expression that is influenced by oxidative stress can be used to measure markers such as F2-isoprostanes. This study aims to examine the association between the polymorphism in the GCLC gene with glutathione plasma level and F2-isoprostanes in contacts of person with infectious tuberculosis (TB). Methodology and results: Samples are taken from the family members of pulmonary TB patients who seeks treatment at the Pulmonary Centre (Lung Health Center for Public = BBKPM) and Policlinic of Dr Wahidin Sudirohusodo Hospital, Makassar. Total of approximately 4 mL of venous blood are taken from each person with pulmonary TB contacts and furtherly analyzed using genomic PCR-RFLP method and ELISA. Our results described that contacts of person with infectious TB for approximately 6 months have polymorphism C/C genotype at 80.3%, C/T of 18.3% and T/T for 1.4% of the total 71 samples with high levels of glutathione from 0.167 to 0.548 mM/mL and F2-isoprostanes level 72.4 - 1343.9 pg/mL. Conclusion, significance and impact of study: There are no significant association between GCLC gene polymorphism with glutathione and F2-isoprostanes levels of individual who had contacted infection TB. In this study the elevation of F2-isoprostanes equal to the decrease levels of glutathione.