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Related Experiment Videos

Neutrophil function in megaloblastic anemia.

R P Falcão1

  • 1Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 1, 1988
PubMed
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Neutrophil chemotaxis is impaired in megaloblastic anemia, but nitroblue tetrazolium reduction and Fc gamma receptor presence remain normal. Correcting the anemia restored normal chemotaxis, despite no increased infection risk observed.

Area of Science:

  • Hematology
  • Immunology
  • Nutritional Anemias

Background:

  • Megaloblastic anemia, characterized by impaired DNA synthesis, affects red blood cells and can impact neutrophil function.
  • Neutrophil dysfunction may increase susceptibility to infections, a phenomenon not typically reported in megaloblastic anemia.

Purpose of the Study:

  • To investigate neutrophil function in megaloblastic anemia by assessing chemotaxis, nitroblue tetrazolium (NBT) reduction, and Fc gamma receptor expression.
  • To determine if neutrophil function abnormalities correlate with the presence or correction of megaloblastic anemia.

Main Methods:

  • Peripheral blood neutrophils from 20 megaloblastic anemia patients (15 folate deficiency, 5 pernicious anemia) and normal controls were analyzed.
  • Measurements included neutrophil chemotaxis, NBT reduction capacity, and Fc gamma receptor surface expression.

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Main Results:

  • Neutrophil chemotaxis was significantly decreased by approximately 20% in patients with megaloblastic anemia (P < 0.05).
  • The percentage of NBT-positive neutrophils and Fc gamma receptor-positive neutrophils did not differ between patients and controls.
  • In three cases where anemia was corrected, neutrophil chemotaxis returned to normal levels.

Conclusions:

  • Megaloblastic anemia is associated with impaired neutrophil chemotaxis, suggesting a specific functional defect.
  • Despite reduced chemotaxis, patients with megaloblastic anemia do not appear to have an increased risk of infection.
  • Neutrophil chemotaxis abnormalities are reversible with correction of the underlying anemia.