Related Experiment Videos
Cell mixing during the early development of mouse aggregation chimera
P Dvorak1, A Yoshiki, D Dvorakova
1Laboratoire de Biologie Cellulaire et Moleculaire, INRA, Jouy en Josas, France.
The International Journal of Developmental Biology
|August 1, 1995
Summary
Mouse aggregation chimeras reveal strain dominance changes during development. Early development shows equal cell mixing, but later stages exhibit specific strain interactions influencing cell distribution and survival.
Area of Science:
- Developmental Biology
- Immunology
- Genetics
Background:
- Mouse aggregation chimeras are crucial models for studying early embryonic development and cell interactions.
- The Major Histocompatibility Complex (MHC), specifically H-2 haplotypes in mice, plays a significant role in immune recognition and compatibility.
- Understanding strain-specific interactions in chimeras can shed light on developmental processes and immune responses.
Purpose of the Study:
- To investigate cell mixing patterns and strain dominance in mouse aggregation chimeras at different developmental stages.
- To analyze the influence of specific H-2 haplotype combinations on cellular interactions within chimeras.
- To explore potential immune-mediated mechanisms affecting chimera development.
Main Methods:
- Creation of mouse aggregation chimeras from two different inbred strain combinations: C3H/HeN x C57BL/6N and C3H/HeN x BALB/cA.
- Analysis of cell proportions at 24 hours post-aggregation (blastocyst stage) using fluorescence-labeled antibodies (CSA) and confocal microscopy.
- Immunohistochemical analysis of 7.5-day post coitum (p.c.) chimeras using biotinylated antibody-avidin peroxidase technique.
Main Results:
- At the blastocyst stage (24h), aggregation chimeras showed equal cell mixing with no strain dominance.
- In 7.5-day p.c. chimeras, C3H/HeN x BALB/cA showed C3H/HeN strain dominance.
- C3H/HeN x C57BL/6N chimeras exhibited reduced C3H/HeN cells (CSA-positive) in 83% of cases, with some exhibiting uniformly CSA-positive extraembryonic tissue.
- Progressive degeneration was observed in 36% of implanted chimeras across both combinations.
Conclusions:
- Cell mixing and strain proportions in mouse aggregation chimeras are dynamic and influenced by developmental stage.
- Specific H-2 haplotype combinations likely mediate immune interactions affecting cellular distribution and survival.
- These findings suggest a role for host-fetal immune interactions in chimera development beyond the blastocyst stage.