RESUMO
Overactivation in Ras signaling has been under intensive study as the molecular basis for development of cancer. Such overactivation can occur in the presence or absence of mutations in Ras gene resulting in activation of a series of down-stream effectors such as transcription factors. Different studies have shown the activation of Ras down-stream effectors in non-Hodgkin lymphoma (NHL) although mutations in Ras are not prevalent in this malignancy. Since overactivation in Ras signaling also increases permissiveness of cancer cells to infection by oncolytic versions of herpes simplex virus (e.g. R3616), we were interested in evaluating the value of transcription factors down-stream of Ras as molecular indicators for permissiveness to herpes therapy. In order to accomplish this, and also to assess the permissiveness of lymphoma cells to infection with R3616, we used NHL cell lines Daudi, Jurkat, NC37, Raji, Ramos and ST486. Once the levels of phosphorylation (activation) of extracellular-signal regulated kinase (ERK, a Ras effector pathway) and its down-stream transcription factor ELK were evaluated, Raji and NC37 showed a significant increase in the phosphorylation levels of both molecules while ATF2 (another transcription factor down-stream of p38-kinase pathway) seemed to be activated in all studied cells. Raji and NC37 cells were also most permissive cells to infection with R3616 while their permissiveness was decreased upon treatment of cells with an inhibitor of ELK-DNA binding portraying ERK/ELK as a suitable predictive indicator for selection of cancer cells with increased sensitivity to R3616. This study, therefore, for the first time documents permissiveness of lymphoma cells to oncolytic herpes viruses and introduces ELK as a suitable factor for predicting tumor susceptibility to these novel anticancer agents.
Assuntos
Herpesviridae/metabolismo , Neoplasias , Vírus Oncolíticos/metabolismo , Transdução de Sinais/fisiologia , Fatores de Transcrição/metabolismo , Proteínas Elk-1 do Domínio ets/metabolismo , Proteínas ras/metabolismo , Antibióticos Antineoplásicos/química , Antibióticos Antineoplásicos/uso terapêutico , Linhagem Celular Tumoral , Cromomicina A3/química , Cromomicina A3/uso terapêutico , Herpesviridae/genética , Humanos , Estrutura Molecular , Neoplasias/genética , Neoplasias/terapia , Terapia Viral Oncolítica/métodos , Vírus Oncolíticos/genética , Fatores de Transcrição/genética , Proteínas Elk-1 do Domínio ets/genética , Proteínas ras/genéticaRESUMO
The aim of the study was to determine whether infectious mononucleosis may trigger atopic symptoms or modulate their clinical course. Data from literature point out to such a relationship and attribute it to the influence of EBV on lymphocytes B and IL-4,IL-5,IL-10 and vIL-10 secretion stimulation. The authors examined 30 children who had suffered from symptomatic infectious mononucleosis 2-4 years previously, evaluating symptoms of allergic diseases and performing skin prick tests with selected inhalant and food allergens. The symptoms of atopic disease were found in 57 % in the mononucleosis group, a significantly higher percentage (p<0.0001) than in general population of children in Lódz (16%). The frequency of positive skin prick tests with common allergens was also significantly higher (60% vs 27%, respectively).
