Abstract 4139456: Integrin α5β1 contributes to pathological remodeling of the right ventricle in pulmonary arterial hypertension
Bibliographic record
Abstract
Introduction: Right ventricular (RV) function is an important prognosis factor in pulmonary arterial hypertension (PAH). In response to pressure overload, the RV undergoes morphological changes driven by the accumulation of extracellular matrix (ECM) elements and cardiomyocyte hypertrophy. Integrins (Itg) are members of the cell adhesion receptor superfamily. Through ECM-binding, Itg are known to transduce extracellular cues to cardiac cells resulting in the activation of pro-hypertrophic and pro-fibrotic signaling pathways. Among them, integrin α5β1 is one of the most abundant heterodimers in cardiac tissue. We thus hypothesized that α5β1 signaling promotes pathological RV remodeling. Methods&Results: Using Western blot (WB), we found elevated levels of Itgα5 and Itgβ1 protein in RV isolated from PAH patients compared to controls. Similar findings were observed in monocrotaline (MCT) and pulmonary artery banding (PAB) rats. In adult rat cardiomyocytes, pharmacological inhibition of α5β1 decreased phenylephrine-induced hypertrophy and reversed established hypertrophy induced by MCT treatment (assessment of cell surface area by F-actin labeling). In human RV fibroblasts (RVFB) inhibition of α5β1 prevented TGFβ1-induced activation of control RVFB and decreased proliferation and activation of RVFB derived from PAH patients (WB PCNA, αSMA, COL1; immunofluorescence Ki67). In vivo , inhibition of α5β1 using a small molecule inhibitor or a blocking-antibody improved RV dysfunction (CO, TAPSE, RVFAC, RV strain, as assessed by echocardiography, right heart catheterization and cardiac magnetic resonance imaging) and diminished RV hypertrophy and fibrosis (Fulton index, H&E and Masson’s trichrome staining) in MCT-injected rats with established PAH and PAB rats. Ex vivo , inhibition of α5β1 attenuated cardiomyocyte hypertrophy and RV fibrosis in human precision-cut RV slices exposed to phenylephrine and TGFβ1. Conclusion: Our results suggest that integrin α5β1 plays a key role in pathological RV remodeling in PAH.
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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) | 0.000 | 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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.016 | 0.003 |
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".