Immune status of Fanconi anemia patients: decrease in T CD8 and CD56dim CD16+ NK lymphocytes
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Fanconi anemia (FA), a rare genetic disease in which patients' life is compromised mainly by hematological abnormalities and cancer prone, seems to be affected by subtle immune cell irregularities. Knowing that FA presents developmental abnormalities and, based on recent reports, suggesting that natural killer (NK) CD56dim and NK CD56bright correspond to sequential differentiation pathways, we investigated if there were changes on the total number of NK cells and subsets as well as on T CD4 and T CD8 lymphocytes and their ratio. A large sample of FA patients (n = 42) was used in this work, and the results were correlated to clinical hematological status of these patients. Among FA patients, a decreased proportion of T CD8+ and NK CD56dimCD16+ cells were observed when compared to healthy controls as well as an imbalance of the subsets NK lymphocytes. Data suggest that FA patients might have a defective cytotoxic response due to the lower number of cytotoxic cells as well as impairment in the differentiation process of the NK cells subsets which may be directly related to impairment of the immune surveillance observed in these patients.
KeywordsFanconi anemia Lymphocytes Immune system NK cells CD8 T cells Flow cytometry
This work was supported by the National Counsel of Technological and Scientific Development (CNPq) and the Rio de Janeiro State Foundation for the Support of Research (FAPERJ).
Conflict of interest
The authors declare that they have no conflict of interest.
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