Relationship between Eicosanoids and Endothelin-1 in the Pathogenesis of Erythropoietin-induced Hypertension in Uremic Rats
Bibliographic record
Abstract
Recent studies suggest a possible link between recombinant human erythropoietin (rhEPO)-induced hypertension and endothelium-derived vasoconstrictor autocoids. The current study was designed to evaluate the role of eicosanoids such as thromboxane (TX) A and prostacyclin (PGI ) and of endothelin-1 (ET-1) and the relationship between these vasoactive substances in rhEPO-induced hypertension in uremic rats. Renal failure was induced by a two-stage 5/6 nephrectomy followed by a 6-week stabilization period. In protocol A, rats were divided into four groups: vehicle, rhEPO (100 u/kg, subcutaneously, three times per week), a selective ET receptor antagonist (ABT-627, 10 mg/kg/d), and rhEPO + ABT-627 for 5 weeks. In protocol B, uremic animals were divided into two groups: rhEPO and rhEPO + a TX receptor antagonist and synthesis inhibitor, ridogrel (25 mg/kg/d), for 5 weeks. At the end of the study, immunoreactive eicosanoid metabolites (TXB and 6-keto-PGF, stable metabolites of TXA and PGI ), and ET-1 were measured in either the thoracic aorta or in the mesenteric arterial bed. After 5/6 nephrectomy, the animals developed uremia, anemia, and hypertension. rhEPO corrected the anemia but aggravated the hypertension. Both drugs were effective in preventing the progression of hypertension in rhEPO-treated rats although ABT-627 was more potent than ridogrel. rhEPO increased the concentration of ET-1 and TXB in blood vessels and ABT-627 decreased tissue levels of both vasopressors. The concentration of 6-keto-PGF was not significantly changed. Ridogrel significantly decreased tissue TXB concentrations but had no effect on ET-1 levels. These results suggest that endothelium-derived vasoconstrictor autacoids (TXA and ET-1) are involved in the pathogenesis of rhEPO-induced hypertension in uremic rats. TXA probably serves as a mediator of the vascular effect of ET-1.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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".