P3 mAb: An immunogenic anti-NeuGcGM3 antibody with unusual immunoregulatory properties

Darel Martínez, Nely Rodríguez Rondón, Tania Griñán, Teresa Rondón, Ana María Vázquez, Rolando Pérez, Ana María Hernández

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4 Scopus citations


P3 is a murine IgM mAb that recognize N-glycosylated gangliosides, sulfatides, and anti- gens expressed in melanoma, breast, and lung human tumors.This antibody has the ability to trigger an IgG antibody response in the syngeneic BALB/c model, even when it is admin- istered in the absence of adjuvant or carrier protein.The mechanism by which the P3 mAb, a self-immunoglobulin, induce this immune response in the absence of co-stimulatory or classical danger signals is still unknown. In the present paper we show that the high immunogenicity of P3 mAb depends not only on CD4 but also on CD8+ T cells, since the depletion of CD8+ or CD4+ T cells led to the loss of P3 mAb immunogenicity in the syngeneic model. Furthermore, the immunization with P3 mAb enhanced the recovery of the CD8+ T cell population in mice treated with an anti-CD8a antibody. Additionally, the immunization with P3 mAb restored the capacity of immunosuppressed mice to reject allogeneic tumors, a mechanism mediated by the action of CD8+ T cells. Finally, in mice with cyclophosphamide induced lymphopenia, the administration of P3 mAb accelerated the recovery of both CD4+ and CD8+ T cells. These results show new possibilities for B and CD8+ T cells interactions during the immune response elicited by a self-protein. Fur- thermore they point to P3 mAb as a potential interesting candidate for the treatment of immunosuppressed patients.

Original languageEnglish
Article numberArticle 94
JournalFrontiers in Immunology
Issue numberAPR
StatePublished - 2012
Externally publishedYes


  • CD8T cells
  • Immunogenicity
  • Immunoregulation
  • Monoclonal antibody


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