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  • Title: Associations of -308G/A polymorphism of tumor necrosis factor (TNF)-α gene and serum TNF-α levels with measures of obesity, intra-abdominal and subcutaneous abdominal fat, subclinical inflammation and insulin resistance in Asian Indians in north India.
    Author: Vikram NK, Bhatt SP, Bhushan B, Luthra K, Misra A, Poddar PK, Pandey RM, Guleria R.
    Journal: Dis Markers; 2011; 31(1):39-46. PubMed ID: 21846948.
    Abstract:
    OBJECTIVES: Obesity is associated with high levels proinflammatory cytokines like tumour necrosis factor alpha (TNF-α), which may play an important role in the genesis of insulin resistance. We evaluated the relationship of -308G/A polymorphism of TNF-α gene with obesity and insulin resistance in Asian Indians in north India. METHODS: This cross-sectional study included 151 apparently healthy individuals (79 males, 72 females) 18-50 yrs of age from New Delhi, India. Body composition by dual-energy x-ray absorptiometry (DEXA) and abdominal fat by magnetic resonance imaging (MRI) were measured. Biochemical measurements included OGTT, lipids, fasting insulin, hs-CRP and TNF-α levels. We analysed -308G/A polymorphism of TNF-α gene and studied its association with obesity and biochemical parameters. RESULTS: At comparable BMI, abdominal obesity was more prevalent in females (50%) as compared to males (20%). The wild genotype (GG) was present in 78.8%, GA in 17.9%, and AA in 3.3% subjects. Measures of body composition, abdominal fat distribution, lipids, insulin, hs-CRP and TNF-α levels were not influenced by the presence of -308G/A polymorphism. Serum TNF-α levels correlated significantly with fasting insulin in both genders. CONCLUSION: TNF-α levels correlate with fasting insulin but not with indicators of body composition in Asian Indians. The -308G/A polymorphism of TNF-α gene is not associated with differences in the serum levels of TNF-α in Asian Indians.
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