Sexual Dimorphism in the Regulation of Liver Connexin32 Transcription in Hexachlorobenzene-Treated Rats
Bibliographic record
Abstract
Hexachlorobenzene (HCB), an epigenetic carcinogen, causes female rats to be more susceptible to liver tumor formation than males. HCB exposure in females downregulates the expression of Cx32, a gap junction protein, through the activation of Akt. The objectives of this study were to determine (1) the implication of different regions of the hepatic Cx32 promoter in the observed sexual dimorphism in the expression of Cx32, (2) the implication of different regions of the hepatic Cx32 promoter in the HCB-induced downregulation of Cx32 in female rat liver, and (3) if HCB exposure modulates the binding of transcription factors on the Cx32 promoter through Akt activation. Male and female rats were exposed to HCB during 5 consecutive days and sampled 45 days later. Electrophoresis mobility shift assays showed that the intensity of only one nuclear protein-DNA complex differed between males and females. The formation of this complex requires two binding sites to be intact in a fragment of the basal promoter (Fr26). Following HCB exposure, the intensity of two complexes (Fr26 and Fr110) was decreased in females, but not in males, consistent with the decrease in Cx32 expression observed only in HCB-treated females. In vitro studies using a rat hepatocyte cell line (MH1C1) showed that the formation of the Fr110 protein-DNA complex appears to be controlled by Akt and requires the integrity of a Myb site. Overall, results suggest that both the sexual dimorphism and the downregulation of Cx32 in HCB-treated female rats are mediated by a reduction in the binding of activating transcription factors on the Cx32 promoter.
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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 | 0.001 | 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".