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IL-8 mRNA expression and IL-8 production by acute myeloid leukemia cells
F Vinante1, A Rigo, C Vincenzi
1Verona University School of Medicine, Department of Hematology, Italy.
Abstract:
Purified leukemic cells from 30 acute myeloid leukemia (AML) cases at diagnosis were investigated for the presence of interleukin 8 (IL-8) mRNA by Northern blot analysis. IL-8 specific transcripts were detected in uncultured blasts in 14/30 cases, 10/14 from patients with M4-M5 and 4/14 from cases with M0-M3 morphology. The transcript expression was associated with the detection of IL-8 molecule in blast cells by immunostaining performed on cytospin preparations. After 24-hour culture, a strong up-regulation or the appearance in cases negative before culture of IL-8 mRNA was observed in all cases tested, and culture supernatants contained high amounts of IL-8. Our data demonstrate that leukemic cells in AML are equipped with the functional apparatus for IL-8 production. Since IL-8 displays a wide range of biological activities, including the regulation of some membrane molecules relevant to adhesion and migration processes, its production by AML blasts might be of relevance for the pattern of leukemic growth.
Insights
Acute myeloid leukemia (AML) blasts produce interleukin-8 (IL-8). This cytokine
Area of Science:
- Hematology
- Molecular Biology
- Oncology
Background:
- Interleukin-8 (IL-8) is a cytokine with diverse biological activities.
- The role of IL-8 in acute myeloid leukemia (AML) pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the presence and production of IL-8 mRNA and protein in leukemic cells from AML patients.
- To explore the potential functional relevance of IL-8 in AML.
Main Methods:
- Northern blot analysis to detect IL-8 mRNA in purified leukemic blasts.
- Immunostaining to detect IL-8 protein in blast cells.
- Cell culture to assess IL-8 production over time.
Main Results:
- IL-8 mRNA was detected in 14/30 AML cases at diagnosis, particularly in M4-M5 subtypes.
- IL-8 protein expression correlated with mRNA detection.
- All cases showed significant IL-8 mRNA up-regulation after 24-hour culture, with high IL-8 levels in supernatants.
Conclusions:
- Leukemic cells in AML possess the machinery for IL-8 production.
- IL-8 production by AML blasts may influence leukemic cell adhesion, migration, and growth patterns.