Differences between newborn and adult mice in their response to immune thrombocytopenia

Zhongbo Hu, William B. Slayton, Lisa M. Rimsza, Matthew Bailey, Hannes Sallmon, Martha C. Sola-Visner

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Background: Sick neonates frequently develop severe thrombocytopenia. Objective and Methods: In order to test the ability of fetal mice to increase their megakaryocyte size and ploidy in response to thrombocytopenia, we injected an antiplatelet antibody (MWReg30) into pregnant mice daily for 7 days, and into nonpregnant adult mice to serve as controls. After that time, platelet counts were obtained and megakaryocytes in the bone marrow, liver, and spleen were stained with anti-von Willebrand factor antibody, individually measured, and quantified. Results: Our study demonstrated that megakaryocytopoiesis in newborn mice shares many features of human fetal/neonatal megakaryocytopoiesis, including the small size of megakaryocytes. In response to thrombocytopenia, adult mice increased megakaryocyte volume and concentration, primarily in the spleen. Newborn mice, in contrast, increased the megakaryocyte concentration in the spleen, but exhibited no increase in megakaryocyte volume in any of the organs studied. In fact, the megakaryocyte mass was significantly lower in the bone marrow of thrombocytopenic neonates than in age-matched controls. Conclusions: We concluded that fetuses have a limited ability to increase their megakaryocyte mass in response to consumptive thrombocytopenia, compared to adult mice. These observations provide further evidence for the existence of biological differences between fetal/neonatal and adult megakaryocytopoiesis.

Original languageEnglish (US)
Pages (from-to)100-108
Number of pages9
JournalNeonatology
Volume98
Issue number1
DOIs
StatePublished - Jun 2010

Keywords

  • Megakaryocyte
  • Thrombocytopenia

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental Biology

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