Toxic Metals Increase Serum Tumor Necrosis Factor-α Levels, Modified by Essential Elements and Different Types of Tumor Necrosis Factor-α Promoter Single-nucleotide Polymorphisms

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Abstract

Background:

Lead (Pb), cadmium (Cd), and arsenic (As) could cause health issues through oxidative stress that is indicated in the elevated tumor necrosis factor-alpha (TNF-α). However, some of the essential elements—selenium (Se), zinc (Zn), cobalt (Co), and copper (Cu)—are cofactors or structural components of antioxidant enzymes. It is suggested that single-nucleotide polymorphisms (SNPs) in the TNF-α gene have different TNF-α responses. This study aims to evaluate the effect of serum TNF-α levels through the interactions between toxic metals and essential elements and how the interactions between the toxic metals and TNF-α SNPs (−1031 T > C, −863 C > A, −857 C > T, −308 G > A, −238 G > A) influence serum TNF-α levels.

Methods:

Blood samples were collected from 455 workers who carried out annual health examinations and multielements determined by inductively coupled plasma mass spectrometry (ICP-MS). TNF-α levels were detected by enzyme-linked immunosorbent assay (ELISA). TNF-α promoter SNPs were analyzed by specific primer probes using real-time polymerase chain reaction (PCR) methods.

Results:

Increasing blood Pb, Cd, and As levels were associated with elevated TNF-α levels. The interaction between Pb and Cu decreased TNF-α levels and so did the interaction between Cd and Se. In the interaction between Pb and SNPs, individuals with AA/AG (−308 G > A) and AA/AG (−238 G > A) had higher serum TNF-α levels. However, lower TNF-α levels were noted in those individuals with AA/CA (−863 C > A). In the interaction between As and SNPs, workers with AA/AG (−238 G > A) had synergic effect with As and induced higher serum TNF-α levels.

Conclusions:

Blood Cu and Se were antagonists of toxic metals (Pb, As, and Cd) through lower serum TNF-α levels. Variant types of TNF-α SNPs (−308 G > A, −238 G > A) and wild type of −863 CC would be more susceptible to toxic metals.

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