Elevation of serum thrombopoietin precedes thrombocytosis in acute infections

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Immunometabolic Circuits in Infection for Advancing Host Directed Therapies
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Immunometabolic Circuits in Infection for Advancing Host Directed Therapies

Published on: September 13, 2024

Akira Ishiguro1, Yoko Suzuki, Mari Mito

  • 1Department of Paediatrics, Mizonokuchi Hospital, Teikyo University School of Medicine, Kawasaki, Japan. ishiguro@med.teikyo-u.ac.jp

British Journal of Haematology
|February 19, 2002
PubMed

Insights

Thrombopoietin (TPO) and interleukin-6 (IL-6) contribute to infection-related thrombocytosis in children. TPO levels rise early in infection, peaking around day 4, while platelet counts increase later, suggesting complex regulatory mechanisms.

Area of Science:

  • Hematology
  • Immunology
  • Pediatric Infectious Diseases

Background:

  • Thrombocytosis, an elevated platelet count, can occur secondary to infections.
  • The precise mechanisms driving infection-induced thrombocytosis, particularly the roles of key cytokines, require further elucidation.
  • Understanding these mechanisms is crucial for managing pediatric patients with inflammatory conditions.

Purpose of the Study:

  • To investigate the longitudinal serum levels of thrombopoietin (TPO) and interleukin-6 (IL-6) in pediatric patients with infection-associated thrombocytosis.
  • To explore the relationship between TPO, IL-6, and C-reactive protein (CRP) levels during acute infections.
  • To clarify the contribution of TPO and IL-6 to the development of thrombocytosis following infections in children.

Main Methods:

  • A longitudinal study design was employed, analyzing serum samples from 15 infants and young children with thrombocytosis (platelets >700 x 10(9)/l) post-infection.
  • 116 age-matched healthy children served as controls.
  • Serum TPO and IL-6 levels were quantified using enzyme-linked immunosorbent assay (ELISA); CRP levels were also measured.

Main Results:

  • In the first week of infection, TPO levels increased significantly, peaking around day 4, while platelet counts remained normal.
  • TPO levels normalized by the time platelet counts peaked in the second and third weeks.
  • Serum TPO levels showed significant positive correlations with CRP (r = 0.688, P < 0.001) and IL-6 (r = 0.481, P = 0.027) levels.

Conclusions:

  • Thrombopoietin (TPO) plays a role in the development of thrombocytosis secondary to infections in children, acting in conjunction with interleukin-6 (IL-6).
  • The temporal dynamics of TPO and IL-6 suggest complex regulatory pathways influencing thrombocytosis during acute infections.
  • These findings indicate that additional regulatory mechanisms beyond TPO and IL-6 likely contribute to the modulation of blood TPO levels in response to infection.

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