Abstract 17939: Lack of the Alpha-11 Integrin in the Heart is Associated With Progressive Diastolic Dysfunction, Myofibrillar Disarray and Impaired Cardiomyocyte Growth
Bibliographic record
Abstract
BACKGROUND: Integrins, transmembrane receptors, play crucial roles in diverse cellular and developmental processes due to critical interactions with the extracellular matrix (ECM). During fetal development and towards adulthood, heart growth and function is suggested to depend on forming and remodeling the ECM and its connection to the myocyte. Currently however, the role of integrins in cardiovascular development (CVD) is poorly defined. Thus, we hypothesized that the α11 integrin (α11), which is expressed by fibroblasts and binds preferentially to type I collagen fibers, plays a vital role in CVD. METHODS: α11 KO and wildtype littermate mice (both n = 8) were examined at 4 weeks and 8 weeks of age. Animals underwent function assessments, including echocardiography and invasive pressure volume (PV) loop analysis, and structural examination via histological and electron microscopy (EM) analysis. RESULTS: At 4 weeks, heart weight (HW) and HW indexed to tibial length were decreased in α11 KO mice (P < 0.05), which were normalized at 8 weeks. Echocardiography revealed reduced end-diastolic area (EDA) at 4 weeks (P < 0.05). Despite normalization of EDA at 8 weeks, PV loop revealed impaired diastolic function as evidence by increased EDP, prolonged Tau and steeper EDPVR (all P < 0.05). No differences in HR or systolic parameters were evident. α11 KO mice also demonstrated structural changes. WGA staining revealed evidence of myofibrillar disarray. Connexin 43 and desmin staining showed increased Z-disk and intermediate filament clustering, respectively. LV myocyte size was also reduced (P < 0.05). Similarly, EM analysis showed reduced cardiomyocyte thickness and distance between end plates (both P < 0.05). CONCLUSION: Loss of α11 resulted in progressively worsening diastolic function that was associated with myofibrillar disarray and impaired cardiomyocyte growth. These findings suggest that α11 is required for the development of normal heart structure and function.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.009 | 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".