Influence of IL-6, IL-8, and TGF-β1 gene polymorphisms on the risk of human papillomavirus-infection in women from Pernambuco, Brazil

Mem Inst Oswaldo Cruz. 2016 Nov;111(11):663-669. doi: 10.1590/0074-02760160051. Epub 2016 Oct 24.

Abstract

Human papillomavirus (HPV) infections are strongly associated with the development of cervical intraepithelial neoplasias and invasive cervical cancer. Polymorphisms in cytokine-encoding genes and behavioural cofactors could play an important role in protecting an individual against viral infections and cancer. Here, we investigated whether IL-6 -174 G>C, IL-8 +396 G>T, and TGF-β1 +869 G>C and +915 G>C polymorphisms were associated with susceptibility to HPV infection in women from north-east (Pernambuco) Brazil. We analysed 108 healthy uninfected women (HC) and 108 HPV-positive women with cervical lesions. Genetic polymorphisms were assessed using Sanger sequencing and polymerase chain reaction-restriction fragment length polymorphism. Comparison of the distribution of the genotypic and allelic frequencies of the IL-18 +396 T>G polymorphism between HPV infected woman an uninfected controls showed that the GG genotype and G allele were both more frequent in the HC group, and were associated with protection from HPV infection (p = 0.0015; OR = 0.29 CI95% = 0.13-0.61; p = 0.0005; OR = 0.45 CI95% 0.29-0.7, respectively). Individuals from the control group could have previously had HPV infection that was spontaneously eliminated; however, it was undetectable at the time of sample collection. Based on our findings, we hypothesize that the IL-8 +396 G>T polymorphism could interfere with susceptibility to HPV infection, by modulating the ability of immune system to fight the virus.

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Alleles
  • Base Sequence
  • Brazil
  • Cross-Sectional Studies
  • DNA, Viral / analysis
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease
  • Humans
  • Interleukin-6 / genetics*
  • Interleukin-8 / genetics*
  • Middle Aged
  • Papillomavirus Infections / genetics*
  • Papillomavirus Infections / virology
  • Polymerase Chain Reaction
  • Polymorphism, Single Nucleotide*
  • Transforming Growth Factor beta1 / genetics*
  • Uterine Cervical Dysplasia / genetics*
  • Uterine Cervical Dysplasia / virology
  • Uterine Cervical Neoplasms / genetics*
  • Uterine Cervical Neoplasms / virology
  • Young Adult

Substances

  • DNA, Viral
  • Interleukin-6
  • Interleukin-8
  • Transforming Growth Factor beta1