Focal Adhesion Signaling in the Rat Myometrium Is Abruptly Terminated with the Onset of Labor1
Bibliographic record
Abstract
The dramatic increase in uterine growth during late pregnancy and the generation of labor contractions require dynamic remodeling of myometrial smooth muscle-ECM interactions. In many tissues, such interactions are provided by focal adhesions; however, there are no data as to the expression of focal adhesion proteins or of focal adhesion signaling in the myometrium. In this study, we show that tyrosine phosphorylation of myometrial FAK (FAK-P-Tyr) and of its downstream substrate, paxillin, exhibited a >10-fold increase during late pregnancy (days 15-22 of pregnancy) with each exhibiting a dramatic fall in P-Tyr on day 23 in association with the onset of labor. These changes in FAK-P-Tyr were paralleled by changes in FAK enzyme activity. Activated ERK1 and ERK2 expression remained relatively unchanged from day 15 to day 23, but decreased markedly 1 day post partum. Treatment of late pregnant rats with progesterone prevented the fall in FAK-P-Tyr/enzyme activity on day 23, and also blocked the onset of labor. These data suggest that progesterone (which decreases at term) modulates myometrial FAK activity/focal adhesion signaling and that these changes may underlie the tremendous remodeling that must occur in order for this muscle to develop optimal contractile activity during labor.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".