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[Farquhar disease. Reduced phagocyte function in a 9-year-old girl with erythrophagocytic lymphohistiocytosis]
H Schroten1, A Kampmann, M Sperzel
1Zentrum für Kinderheilkunde, Heinrich-Heine-Universität Düsseldorf.
Insights
Phagocyte function tests revealed impaired chemiluminescence and yeast-killing capacity in monocytes and granulocytes of an infant with familial hemophagocytic lymphohistiocytosis (HLH). These deficits persisted regardless of disease status, indicating a fundamental immune cell defect in HLH.
Area of Science:
- Immunology
- Cell Biology
- Pediatric Hematology
Background:
- Familial hemophagocytic lymphohistiocytosis (HLH) is a rare, life-threatening hyperinflammatory syndrome.
- Defective cytotoxic lymphocyte function is a hallmark of primary HLH, but phagocyte function in this condition requires further elucidation.
- Understanding immune cell defects is crucial for diagnosing and managing HLH.
Observation:
- Phagocyte function, specifically chemiluminescence and killing of Saccharomyces cerevisiae, was assessed in a female infant diagnosed with familial HLH.
- Tests were conducted before and after chemotherapy, during remission, to evaluate functional capacity of monocytes and granulocytes.
- The study focused on innate immune cell responses in the context of a primary immunodeficiency.
Findings:
- Monocytes and granulocytes from the infant consistently demonstrated markedly reduced chemiluminescence.
- The capacity of these phagocytes to kill Saccharomyces cerevisiae was also significantly impaired.
- These functional deficits were observed irrespective of the infant's clinical stage, including remission post-chemotherapy.
Implications:
- The findings suggest a potential intrinsic defect in phagocyte function in familial HLH, beyond the known cytotoxic T-cell abnormalities.
- This could contribute to the overall immune dysregulation and hyperinflammation characteristic of HLH.
- Further research into phagocyte dysfunction in HLH may reveal novel therapeutic targets and diagnostic markers.
Abstract:
We report phagocyte function tests in a female infant with familial hemophagozytotic lymphohistiocytosis. Chemiluminescence and killing of Saccharomyces cerevisiae by monocytes and granulocytes before chemotherapy and in remission were examined. Patients' monocytes and granulocytes showed a markedly reduced chemiluminescence and killing capacity irrespective of the stage of disease.