Perfil de citocinas da polipose nasossinusal na Fibrose Cística comparado com indivíduos sem doenças nasossinusais / Cytokine profile in subjects with Cystic Fibrosis and nasal polyposis compared to patients with no nasal disorders

RESUMO

Embora o perfil das citocinas na polipose nasossinusal seja bem documentado, pouco se sabe sobre estas proteínas quando associadas à Fibrose Cística. Objetivos: Avaliar a expressão das citocinas IL¬4, IL¬5, IL¬6, IL¬8, GM¬C-SF e IFN--y analisada pela RT¬-PCR, nos pólipos de pacientes com Fibrose Cística. Material e método: Estudo transversal, prospectivo, de 24 pacientes, 13 com Fibrose Cística e polipose nasossinusal (Grupo Fibrose Cística) e 11 com exame otorrinolaringológico normal (Grupo Controle). A média de idade foi de 21 anos (3¬-57), 12 eram do sexo masculino e 12 do sexo feminino. O perfil das citocinas foi pesquisado nos fragmentos de mucosa (Grupo Controle) ou pólipo nasal (Grupo Fibrose Cística) através da RT-¬PCR. Foram estudadas as transcrições para as citocinas IL¬4, IL¬5, IL¬6, IL¬8, IFN¬y e GM¬-CSF ajustadas pelo valor da β¬ actina. Resultados: As interleucinas 5, 6, 8 e GM¬-CSF foram semelhantes nos dois grupos (p>0,05). Menores valores de IFNy¬ (p=0,03) e forte tendência de aumento de IL¬4 (p=0,06) foram observados no grupo Fibrose Cística. Conclusão: As células inflamatórias e estruturais podem produzir RNA mensageiro para IL¬4, bloqueando a produção de outras citocinas com IFN-y¬, sugerindo a participação destes mecanismos na formação dos pólipos da Fibrose Cística.

ABSTRACT

Although the cytokine profile in nasal polyposis is well documented, little is known about cytokines associated to cystic fibrosis. AIM: Assess the expression of cytokines IL¬4, IL¬5, IL¬6, IL¬8, GM¬-CSF and IFN¬-y, analyzed through RT-PCR, in the polyps of patients with cystic fibrosis. Materials and methods: A cross-sectional, prospective study was carried out with 24 patients, 13 of whom had cystic fibrosis and nasal polyposis (Cystic Fibrosis Group) and 11 had normal otorhinolaryngological exams (Control Group). The average age was 21 years (3¬57); 12 participants were males and 12 were females. The cytokine profile was studied in mucosal fragments (Control Group) or nasal polyps (Cystic Fibrosis Group) through RT¬PCR. Transcriptions were studied for cytokines IL¬4, IL¬5, IL¬6, IL¬8, IFN¬y and GM¬CSF, adjusted for the β¬-actin value. Results: Interleukins 5, 6, 8 and GM¬CSF were similar in both groups (p>0.05). There were lower values of IFN-y¬ (p=0.03) and a strong tendency toward an increase in IL¬4 (p=0.06) in the Cystic Fibrosis Group. Conclusion: Inflammatory and structural cells may produce messenger RNA for IL¬4, blocking the production of other cytokines such as IFN-y, suggesting the participation of this mechanism in the formation of polyps in cystic fibrosis.