The Potential Role of the Heme Oxygenase/Carbon Monoxide System in Male Sexual Dysfunctions
Bibliographic record
Abstract
INTRODUCTION: Recently there has been a growing interest regarding the role of carbon monoxide (CO) and its precursor, heme oxygenase (HO) in mediation of penile erection and their potential roles as molecular targets in treatment of erectile dysfunction. AIM: To review the available literature on the role of the HO/CO system in male sexual dysfunctions. METHODS: This review will begin by a discussion of the physiology of the HO/CO system followed by a detailed assessment of the literature examining the role of HO/CO system in male sexual dysfunctions. MAIN OUTCOME MEASURES: The effect of HO/CO system on penile erection, ejaculation, and priapism. RESULTS: Most of the studies attempting to investigate the role of HO/CO in male sexual functions focused on penile erection. The majority of these studies did report a significant positive effect of the HO/CO system on penile erection. However, none of these studies examined the role of HO/CO system in aging animals; aging being considered the most important risk factor for ED. Furthermore, only one study tested the role of HO/CO system in erectile function. The important observation that HO-2 deficient mice have low bulbospongiosus muscle activity deserves extensive research on the value of HO inhibition in the treatment of premature ejaculation. Data from the only study on low-flow priapism and HO suggests that HO-1 is involved in the paradigm of low-flow priapism. CONCLUSIONS: The HO/CO system may have an important role in many male sexual functions. Extensive research is needed to precisely delineate the extent to which the HO/CO system plays in the physiology and pathophysiology of male sexual dysfunctions.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".