Abstract 18643: Role for RUNX2 in Pulmonary Arterial Hypertension
Bibliographic record
Abstract
Introduction: Pulmonary arterial hypertension (PAH) is a vascular remodeling disease characterized by enhanced pulmonary artery smooth muscle cells (PASMC) proliferation, calcification and suppressed apoptosis. Numerous biological pathways have been implicated in the sustainability of this phenotype, including P53/P21, Bcl-2 along with the STAT3/NFAT axis. Several studies have demonstrated that miR-204 is downregulated in PAH. Interestingly, miR-204 directly regulates the expression of the transcription factor RUNX2, which is implicated in many features characterizing PAH, including modulation of the BMPR2, P53/P21, and Bcl2 pathways. Hypothesis: Thus, we hypothesized that a miR-204 dependent upregulation of RUNX2 in PAH promotes PASMC proliferation, resistance to apoptosis and calcification. Methods/Results: Using human explanted lungs, fresh distal PAs and freshly isolated PASMC from both control and PAH patients (n=5 to 12), we demonstrated a significant (p<0.05) upregulation of RUNX2 (RT-qPCR, western blot and immunofluorescence) in PAH compared to controls. Gain and loss functions experiments in PASMC showed that downregulation of miR-204 in control PASMC increases RUNX2 expression, while increases in miR-204 in PAH-PASMC decreases it (n=3 to 5 p<0.05). Increased RUNX2 expression was associated with a downregulation of P53/P21 and an upregulation of Bcl2 (n=3 to 8 p<0.05). More importantly, restoring miR-204 or decreasing RUNX2 expression decreased calcification (red alizarin), proliferation (Ki67) and resistance to apoptosis (TUNEL) in human PAH-PASMC (n=3 p<0.05), while upregulating RUNX2 in control PASMC using an adenovirus mimicked PAH phenotype (n=3 p<0.05). Finally, in Sugen/hypoxia rat model of PAH, nebulization of RUNX2 siRNA (n=15) decreased mean PA pressure, pulmonary vascular resistance, and increased exercise tolerance and cardiac output (p<0.05). Conclusions: Taken together, our study uncovers a new miR-204-RUNX2 axis contributing to a P53/P21-dependent pro-proliferative and Bcl2-dependent anti-apoptotic phenotype in PAH-PASMC.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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 source (direct Gemma or distilled Codex), 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".