Regulation ofβ-catenin mRNA and protein levels in human villous cytotrophoblasts undergoing aggregation and fusion in vitro: correlation with E-cadherin expression
Bibliographic record
Abstract
Abstract The cellular mechanisms underlying the formation and organization of the human placenta remain poorly understood. Recent studies have demonstrated that E-cadherin, in association with the cytoplasmic protein known asβ-catenin, plays an integral role in the differentiation of the trophectoderm in the murine and bovine embryo. Although E-cadherin expression is regulated during the aggregation and fusion of human villous cytotrophoblasts, the expression ofβ-catenin during the terminal differentiation of these primary cell cultures has not been determined. In this study,β-catenin mRNA concentrations and protein expression were examined in primary cultures of human villous cytotrophoblasts using northern and western blot analysis.β-catenin mRNA concentrations and protein expression were high in freshly isolated mononucleate cytotrophoblasts but decreased as these cells underwent aggregation and fusion to form syncytium. A similar pattern of expression was observed for the E-cadherin mRNA transcript and protein species present in these cell cultures. Immunoprecipitation studies demonstrated that theβ-catenin and E-cadherin protein species present in the mononucleate cytotrophoblasts were capable of forming intracellular complexes. In contrast,β-catenin and E-cadherin mRNA and protein expression in JEG-3 choriocarcinoma cells remained constant over time in culture.β-catenin and E-cadherin expression was subsequently immunolocalized to the aggregates of mononucleate cells present in both of these trophoblastic cell cultures and the villous cytotrophoblasts of the human first trimester and term placenta. Taken together, these observations indicate that the E-cadherin-β-catenin complex plays a central role in the terminal differentiation of human trophoblasts in vitro and in vivo.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".