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Related Experiment Videos

Are cord blood B cells functionally mature?

A Tucci1, A Mouzaki, H James

  • 1Department of Medicine, Geneva University Hospital, Switzerland.

Clinical and Experimental Immunology
|June 1, 1991
PubMed
Summary

Newborns exhibit low immunoglobulin production due to immature T and B cells. However, potent T cell signals can overcome this B cell immaturity in vitro, enabling antibody responses.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Newborns show reduced immunoglobulin secretion after pokeweed mitogen (PWM) stimulation, often attributed to immature T and B cells.
  • Cord blood T cells display naive phenotypes with dominant suppressor activity over helper activity, impacting B cell function.
  • Cord blood B cells, despite expressing diverse immunoglobulins, secrete minimal IgG and IgA in standard assays.

Purpose of the Study:

  • To investigate the underlying causes of diminished immunoglobulin secretion in newborn cord blood mononuclear cells (MNC).
  • To assess the competence of cord blood B cells in generating antibody responses under specific in vitro conditions.
  • To evaluate the role of transforming growth factor-beta 1 (TGF-beta 1) in the low PWM response of cord blood cells.

Main Methods:

  • Cultured cord blood and adult mononuclear cells (MNC) with mutant EL-4 thymoma cells and T cell supernatant to stimulate B cell responses.
  • Assessed immunoglobulin (IgM, IgG, IgA) secretion in response to PWM stimulation.
  • Quantified transforming growth factor-beta 1 (TGF-beta 1) sensitivity and mRNA levels in MNC.
  • Utilized neutralizing anti-TGF-beta 1 antibodies to investigate its inhibitory role.

Main Results:

  • Cord blood B cells demonstrated competence in generating clonal IgM, IgG, and IgA responses when provided with potent T cell signals in vitro.
  • TGF-beta 1 sensitivity and mRNA levels were comparable between adult and cord blood cells.
  • Neutralizing anti-TGF-beta 1 antibody enhanced adult PWM responses but did not significantly improve immunoglobulin secretion in cord blood MNC.
  • Immunoglobulin secretion in cord blood MNC remained very low even with TGF-beta 1 inhibition.

Conclusions:

  • Endogenous TGF-beta 1 contributes to suppression in the PWM system but is not the primary cause of low cord blood MNC immunoglobulin response.
  • The 'immaturity' of newborn B cells can be overcome by potent T cell signals in vitro, suggesting their potential for T-dependent antibody responses in vivo.

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