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Immune responsiveness in offspring of adoptively immunized mothers
Insights
Maternal adoptive immunization increases antibody-forming cells (PFC) in newborn mice offspring, even when foster nursed. Direct immunization of newborns, however, decreases PFC, suggesting potential transplacental immune cell transfer.
Area of Science:
- Immunology
- Developmental Biology
- Maternal-fetal transfer
Background:
- The development of the neonatal immune system is crucial for survival.
- Understanding how maternal immunity influences offspring immunity is vital.
- Adoptive immunization models are used to study immune responses.
Purpose of the Study:
- To investigate the effect of maternal and direct neonatal adoptive immunization on antibody-forming cells (PFC) in newborn mice.
- To explore the potential mechanisms behind observed immune responses, including transplacental cell passage.
Main Methods:
- Adoptive immunization of pregnant F1 mice, fetuses, and/or newborns with anti-paternal antibodies.
- Quantification of spleen plaque-forming cells (PFC) at specific postnatal ages.
- Cross-fostering experiments to control for maternal environment.
Main Results:
- Offspring from adoptively immunized mothers showed increased PFC numbers from 6-11 days post-birth.
- This increase in PFC persisted even when newborns were foster-nursed by untreated mothers.
- Direct adoptive immunization of newborns led to a decrease in PFC during the second week after birth.
Conclusions:
- Maternal immunization can significantly enhance the development of antibody-producing cells in offspring.
- The results suggest a potential role for transplacental transfer of immunocompetent cells from mother to fetus.
- Neonatal immune responses can be modulated by both maternal factors and direct immunization strategies.
Abstract:
The rate of appearance of cells forming 19S hemolytic antibody (PFC) in the spleens of F1 newborn mice after adoptive anti-paternal immunization of fetuses, newborns and/or their mothers during pregnancy has been studied. An increase in the number of PFC was found at the age of 6 to 11 days in offspring of adoptively immunized mothers. These newborns, even when foster nursed by untreated mothers, still had a significantly higher number of PFC in comparison to the controls. In contrast, adoptive immunization of the newborns themselves resulted in a decrease of PFC during the second week after birth. Several possible explanations for the obtained results are discussed including the putative transplacental passage of immunocompetent cells.