Treatment with polyclonal immunoglobulin during T-cell reconstitution promotes naive T-cell proliferation

Ana Elisabete Pires, Ana Filipa Afonso, Ana Queirós, Maria Salomé Cabral, Luis Porrata, Svetomir N. Markovic, Srini V. Kaveri, Maria Gomes Da Silva, Cristina João

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Natural antibodies are unique self molecules endowed with both suppressive and activating functions on various cells of the immune system and are recognized as a fundamental link between the adaptive and innate immune system. Here, we examine the role of natural antibodies, using polyclonal immunoglobulins (Ig), as a promoter of T-cell reconstitution in a context of lymphopenia. We have established a mouse model to mimic immunologic recovery in adult patients with severe hypothymic function subjected to autologous hematopoietic precursor cell transplantation. Thymectomized mice were transplanted and treated with low doses of Ig or its Fab or Fc fragments. The animals displayed, during early phases of Ig treatment, a significant increase of T-cell reconstitution displaying a naive CD4 +phenotype. In addition, the Igtreated animals exhibited an increase dilution of single-joint T-cell receptor excision circles (sjTRECs) in peripheral blood, suggesting an early increase in proliferation of T cells stimulated by the natural antibodies. These results unveil a novel and considerable effect of intravenous Ig treatment in situations of severe lymphopenia as a stimulator of proliferation of peripheral naive T cells, possibly protecting diverse immune repertoires.

Original languageEnglish (US)
Pages (from-to)618-625
Number of pages8
JournalJournal of Immunotherapy
Issue number6
StatePublished - Jul 2010


  • Homeostatic peripheral expansion
  • Immune reconstitution
  • Immunoglobulin
  • Naive T lymphocytes
  • TRECs

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Pharmacology
  • Cancer Research


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