Abstract 13748: A Disintegrin and Metalloproteinase 17 Deletion in Smooth Muscle Cell Transiently Suppresses Angiotensin II Mediated Hypertension
Bibliographic record
Abstract
Introduction: A disintegrin and metalloproteinase-17 (ADAM17) proteolytically releases membrane-bound growth factors and cytokines. Hypertension is associated with remodeling, hypertrophy and hyperplasia of smooth muscle cells (SMCs). ADAM17 has been reported to mediate Angiotensin II (Ang II)-induced SMC hypertrophy. We investigated the role of smooth muscle cell ADAM17 in Ang II-induced hypertension. Hypothesis: Smooth muscle cell ADAM17 deficiency suppresses Ang II-induced hypertension. Methods: SMC-specific ADAM17-deficient mice ( Adam17 flx/flx /SM22Cre ; Adam17 SMC-Cre ), and littermate controls ( Adam17 flx/flx ) received Ang II or saline (Alzet pumps, 1.5 mg/kg/d; 4 wks). Blood pressure was measured in conscious mice before and 4 wks after Ang II infusion (Telemetry). Vascular function (vasoconstrictor/dilator response), circumferential wall stress/strain were assessed in second order mesenteric arteries ex vivo at 2 wks after Ang II/saline infusion. SMCs were isolated from either genotype (enzyme dispersal method). SMC proliferation (BrdU incorporation), migration (scratch assay) and apoptosis (Annexin V/7-AAD staining, Flow Cytometry) were assessed (±Ang II). Activation of signaling pathways (phospho/total EGFR, Akt and ERK1/2), HB-EGF were assessed by Western blot. Results: Adam17 SMC-Cre mice exhibited suppressed hypertension in the 1 st week of Ang II infusion (reduced systolic, diastolic & MAP). However, by the 2 nd week, systolic and diastolic BP rose to similar levels as Adam17 flx/flx mice and remained similar. Ex vivo analyses revealed similar acute vasoconstrictor/dilator responses, and comparable wall stiffness in both genotypes; but the Ang II-induced increase in wall thickness was not observed in Adam17 SMC-Cre group. ADAM17-deficient SMCs showed reduced Ang II-induced proliferation, migration, and activation of HB-EGF and ERK1/2. A time-course study revealed delayed Ang II-mediated EGFR activation in ADAM17-deficient SMCs (@24 hrs vs 30 min). End organ damage, hypertrophy and fibrosis in the heart and kidneys, were comparable. Conclusions: ADAM17 deficiency in SMCs causes a transient reduction in Ang II-induced hypertensive response, possibly due to delayed activation of the EGFR pathway.
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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 | 0.001 |
| Bibliometrics | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 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".