RESUMO
Extrapulmonary TB (EPTB) occurs with increased frequency in persons with underlying immunodeficiency. Even after recovery from acute illness, differences in immune phenotype and activation persist. Studies defining characteristics of immune responses after recovery from extrapulmonary TB may provide insights into factors that increase TB risk. We performed two case-control studies (in the United States and Brazil) among HIV-seronegative adults with previous EPTB (n = 9; 25), previous pulmonary TB (n = 7; 25), latent M. tuberculosis (Mtb) infection (n = 11; 25), and uninfected TB contacts (n = 10; 25). We assessed the frequency of dual CD4+ interferon-γ and tumor necrosis factor-α responses after stimulation with overlapping Mtb peptides from ESAT-6 or CFP-10, or gamma-irradiated Mtb H37Rv, proliferative responses to Mtb antigens, T-regulatory cell (Treg) frequency and phenotype. In both study populations, individuals with prior EPTB had the highest frequency of intracellular cytokine-producing cells in response to Mtb antigens (p < 0.05; p <.0001). Persons with prior EPTB in Brazil had the highest levels of CD4 proliferation to Mtb antigens (p < 0.0001), and the highest expression of CD39 on Tregs (p < 0.0001). Individuals with treated EPTB maintained high frequencies of Mtb-specific memory responses and active Treg cells, suggesting that susceptibility to EPTB occurs despite the ability to develop and maintain enhanced adaptive immune responses.
Assuntos
Linfócitos T CD4-Positivos/imunologia , Memória Imunológica , Mycobacterium tuberculosis/imunologia , Tuberculose/imunologia , Adulto , Idoso , Antígenos de Bactérias/imunologia , Antituberculosos/uso terapêutico , Proteínas de Bactérias/imunologia , Brasil , Linfócitos T CD4-Positivos/efeitos dos fármacos , Linfócitos T CD4-Positivos/microbiologia , Estudos de Casos e Controles , Proliferação de Células , Células Cultivadas , Citocinas/metabolismo , Feminino , Interações Hospedeiro-Patógeno , Humanos , Ativação Linfocitária , Masculino , Pessoa de Meia-Idade , Mycobacterium tuberculosis/efeitos dos fármacos , Fenótipo , Fatores de Tempo , Resultado do Tratamento , Tuberculose/tratamento farmacológico , Tuberculose/microbiologia , Estados UnidosRESUMO
OBJECTIVE: To prospectively evaluate the acute impact of Kawasaki disease (KD) on health-related quality of life (HRQoL) and to assess deterioration in the HRQoL experienced by children with KD compared with other childhood diseases. STUDY DESIGN: We merged the Outcomes Assessment Program database obtained prospectively with the existing KD database and queried for KD admissions between 1 month and 13 years of age. HRQoL was evaluated with the parent-proxy Pediatric Quality of Life Inventory (PedsQL) 4.0 Generic Core and Infant Scales. We compared the KD HRQoL results with those obtained from newly diagnosed patients with cancer and pneumonia, matched for age, sex and race. PedsQL total scores over time were assessed with ANCOVA models, adjusted for matching variables and PedsQL score prior to admission. RESULTS: We identified 89 patients with KD and compared 65 subjects with an equal number with pneumonia and with 67 subjects with newly diagnosed cancer. Patients with demonstrated lower PedsQL total score on admission and suffered a significantly greater HRQoL decline from baseline to admission than the other groups. KD diagnostic subtype (complete or incomplete) and coronary artery dilatation were not associated with HRQoL outcomes. However, non-intravenous immunoglobulin responders showed greater HRQoL decline than responders (P = .03). CONCLUSIONS: Children with KD suffer acute and significant HRQoL impairment exceeding that of children newly diagnosed with cancer. Lack of immediate treatment response may exert an additional HRQoL burden, whereas KD subtype and coronary artery dilatation do not.