Expressão imunohistoquímica de moléculas HLA não clássicas (HLA-G E HLA-E) e receptores CD4, CD28 em lesões de mucosa oral, associada a infecção pelo papilomavírus humano (HPV)
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Data
2006-12-13
Autores
Fregonezi, Paula Andréa Gabrielli [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
As células tumorais infectadas pelo HPV podem apresentar estratégias para escapar da resposta imunológica resultando na persistência da infecção viral e na transformação celular maligna. O objetivo do presente estudo foi investigar o papel das células T e, indiretamente, das células Natural Killer (NK), em lesões orais causadas pelo HPV. A avaliação imunohistoquímica dos receptores de células T em infiltrado linfocitário foi realizada nas 79 biópsias de mucosa oral divididas de acordo com sua diferenciação histológica. Tipos de HPV de alto risco foram mais freqüentes em todas as lesões orais e infecções por diferentes tipos de HPV foram observados na mesma lesão. Diminuição da expressão de CD4/CD25 e CD25/CD28 ( P=0,037) foi observada nas lesões malignas e em todas as lesões com HPV. Menor expressão de CD4 e maior expressão de CD28 foram observadas em lesões orais malignas quando comparadas com as lesões benignas (P=0,005). Em 51 pacientes, elevada expressão de HLA-G foi observada em lesões orais benignas (p<0,01) e progressivamente diminuiu nas lesões pré-malignas e malignas.Correlação inversa (r = - 0,3944, p<0,05) foi observada em lesões orais com HPV, com alta expressão de HLA-G e baixa expressão de HLA-E. Em conclusão, a diminuição da expressão de receptores de células T e de moléculas HLA-E, bem como a maior expressão de moléculas HLA-G pode ser uma estratégia do HPV para escapar da imunovigilância do hospedeiro, resultando na infecção viral persistente e na carcinogênese oral.
HPV-infected tumor cells could present strategies to evade from the immune responses, resulting in the persistence of viral infection and to malignant cell transformation. The aim of the present study was to investigate the role of T cells, and, indirectly, natural killer cells, in HPV-infected oral lesions. To investigate T cell receptors in lymphocyte infiltrate, immunohistochemistry evaluation was performed in 79 oral biopsies, stratified according histological differentiation. High-risk HPV types were more frequent among all oral lesions and multiple HPV type infection was observed in the same oral lesions. Downregulation of CD4/CD25 and CD25/28 (P=0.037) was observed in malignant oral lesions and in all oral lesions groups HPV-infected. Lower expression of CD4 and higher expression of CD28 were observed in malignant oral lesions, when compared with benign lesions (P=0.005). In 51 patients, HLA-G overexpression was observed in benign oral lesions (p < 0.01) and progressively decreased in premalignant to malignant oral lesions. An inverse correlation (r = - 0.3944, p< 0.05) was observed in HPV-infected oral lesions, with high HLA-G expression and low HLA-E expression. We can conclude that downregulation of T cell receptors and HLA-E tissue expression as well as upregulation of HLA-G molecule might be an HPV strategy to escape from host immune surveillance, which could result in HPV persistent infection and oral carcinogenesis.
HPV-infected tumor cells could present strategies to evade from the immune responses, resulting in the persistence of viral infection and to malignant cell transformation. The aim of the present study was to investigate the role of T cells, and, indirectly, natural killer cells, in HPV-infected oral lesions. To investigate T cell receptors in lymphocyte infiltrate, immunohistochemistry evaluation was performed in 79 oral biopsies, stratified according histological differentiation. High-risk HPV types were more frequent among all oral lesions and multiple HPV type infection was observed in the same oral lesions. Downregulation of CD4/CD25 and CD25/28 (P=0.037) was observed in malignant oral lesions and in all oral lesions groups HPV-infected. Lower expression of CD4 and higher expression of CD28 were observed in malignant oral lesions, when compared with benign lesions (P=0.005). In 51 patients, HLA-G overexpression was observed in benign oral lesions (p < 0.01) and progressively decreased in premalignant to malignant oral lesions. An inverse correlation (r = - 0.3944, p< 0.05) was observed in HPV-infected oral lesions, with high HLA-G expression and low HLA-E expression. We can conclude that downregulation of T cell receptors and HLA-E tissue expression as well as upregulation of HLA-G molecule might be an HPV strategy to escape from host immune surveillance, which could result in HPV persistent infection and oral carcinogenesis.
Descrição
Palavras-chave
Papilomavirus humano (Imunohistoquímica), Lesões orais, HLA não clássicas, Lesions HPV, Oral carcinogenesis
Como citar
FREGONEZI, Paula Andréa Gabrielli. Expressão imunohistoquímica de moléculas HLA não clássicas (HLA-G E HLA-E) e receptores CD4, CD28 em lesões de mucosa oral, associada a infecção pelo papilomavírus humano (HPV). 2007. 145 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Farmacêuticas, 2007.