Modulation of the humoral immune response by placental secretory factors.
OBJECTIVE
To investigate how the factors secreted by human placenta modify the quality and the quantity of the antibody produced by the hybridoma as well as its cellular proliferation.


METHODS
Supernatants of cultures of human placenta (PS) were added to a mouse IgG1 hybridoma culture producing anti-DNP antibodies. The quantity of monoclonal antibody produced, the nature of these antibodies and the proliferation of the hybridoma cells were studied.


RESULTS
It was found that PS augmented by 40-50% the quantity of total antibody produced, increased the proportion of asymmetric (blocking) antibodies from 15% to 30%, and diminished the cellular proliferation, as measured by 3H-thymidine incorporation.


CONCLUSIONS
These results, together with other similar observations already described in human, rat and mouse pregnancies, suggest that secretory factors produced by the placenta do modify the immune response of the mother against paternal antigens and participate in the mechanisms that make possible the survival of the allogenic fetus.
Malan Borel
I
I
IDEHU-Instituo de Estudios de la Inmunidad Humoral (CONICET-UBA), Buenos Aires, Argentina.
Miranda
S
S
Menezes Freire
S
S
Canellada
A
A
Eslave Bueno
M
M
Binaghi
R
R
Margni
R A
RA
D000276:Adjuvants, Immunologic / Q000502:physiology*; D000818:Animals; D000917:Antibody Formation / Q000187:drug effects*; D002474:Cell-Free System / Q000276:immunology; D002478:Cells, Cultured; D003470:Culture Media / Q000494:pharmacology; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D010920:Placenta / Q000276:immunology* / Q000378:metabolism*; D014327:Trophoblasts / Q000276:immunology / Q000378:metabolism
D000276:Adjuvants, Immunologic; D003470:Culture Media