RESUMO
Granulocyte colony stimulating factor (G-CSF) restores neutrophil count in patients with chemotherapy-induced neutropenia. G-CSF can also induce production of epithelial neutrophil activating protein-78 (ENA-78) and interleukin-8 (IL-8), chemotactic factors from neutrophils in vitro. This study was purposed to investigate whether this effect is also observed in vivo. 10 lymphoma patients were selected who received chemotherapy and G-CSF (nartograstim) administration. Blood was obtained before chemotherapy [Time Point 1 (TP1)], at neutropenic phase before G-CSF administration (TP2), and at neutrophil recovery phase after G-CSF (TP3). ENA-78 and IL-8 mRNA in neutrophils were quantified by real-time PCR. Phagocytosis and reactive oxygen species (ROS) generation were examined by flow cytometry. The results showed that ENA-78 and IL-8 mRNA expression at TP2 increased in 5 and 8 patients, respectively. The ENA-78 mRNA expression at TP3 was increased in 3 and decreased in 6 patients, and IL-8 mRNA expression at TP3 decreased in 7 patients. G-CSF did not affect phagocytosis and normalized ROS generation in all of the patient. It is concluded that increase of ENA-78 and IL-8 expression in neutrophils is common in chemotherapy-induced neutropenic patients. G-CSF administration does not significantly increase ENA-78 and IL-8 expression.