Estudo de associação de polimorfismos nos genes CCR2 e CCR5 com o desenvolvimento de lesões cervicais induzidas pelo HPV

Abstract

Cervical cancer (CC) affects about half a million women each year worldwide. The main etiological agent that can lead to the development of the CC is the human papillomavirus (HPV). However, not all women infected with HPV will have a progression to cancer, since the neoplastic development involves immune, genetic and environmental factors. Chemokine receptors play an important role in immune response, and progression of cervical intraepithelial neoplasia (CIN) for CC. Genetic variations related to the genes of these receptors may lead to the formation of cervical neoplasia. This study aimed to associate polymorphisms in genes of CCR2-64I chemokine receptor (rs1799864) and CCR5-Δ32 (rs333) with susceptibility to the development of cervical lesions (CIN or CC) in women from the State of Pernambuco, Brazil. The study population consisted of 139 women with cervical lesions (patients) and 151 healthy women (controls). The CCR2-64I and CCR5-Δ32 polymorphisms were analyzed by the technique of PCR-RFLP. The HPV detection was performed using the standard PCR technique. A protective effect for individuals carriers of a mutant genotypes (GA or AA) for individuals with cervical injury to the polymorphism in CCR2-64I gene (OR = 0.37, p = 0.0008). The same was observed for the A allele (OR = 0.39, P = 0.0002). In contrast, no association to the polymorphism in the CCR5-Δ32 gene was observed (p> 0.05). The prevalence of HPV types showed that 38.8% of patients were infected with HPV16; 22.3% HPV 18; HPV31 2.9%; 3.6% HPV 33; and 14.4% for other types of HPV. For multiple infection 18% of patients were co-infected with types 16 and 18. When we analyzed the association of HPV type with CCR2-64I polymorphism in the gene between individuals of the group of patients there is an effect protector of infection for HPV 16 (OR = 0.35, p = 0.0184). Moreover, when patients were stratified according to the severity of cervical lesions, 28.78% (40/139) had CIN I (low grade lesion), 62.58% (87/139) had CIN II or III (high-grade lesions) and 8.63% (12/139) had CC. In summary, our study showed CCR2-64I polymorphism protective effect of both susceptibility to infection with HPV 16 and for the development of cervical lesions (CIN and CC).