Evidence map›Paper›PMID 23889981›Full record

ArticleThe journal of sexual medicine2013

Metformin treatment improves erectile function in an angiotensin II model of erectile dysfunction.

Hicham Labazi, Brandi M Wynne, Rita Tostes, R Clinton Webb

Abstract read
In one paragraph

Article in The journal of sexual medicine, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed, 1 pooled it
3.3field-weighted citation impact, top 8% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 1 synthesis or guideline pooled it, 38 citations in OpenAlex.

  1. Pooled it
  2. Review
  3. Effects of Anti-Diabetic Drugs on Erectile Dysfunction: A Systematic Review and Meta-Analysis.Diabetes, metabolic syndrome and obesity : targets and therapy · 2025
    Review
  4. Article
  5. Article
  6. Review
  7. Review
  8. Review
  9. Erectile dysfunction in renal failure and transplant patients.Translational andrology and urology · 2019
    Review
  10. Review
  11. Article
  12. Role of Adenosine Receptor(s) in the Control of Vascular Tone in the Mouse Pudendal Artery.The Journal of pharmacology and experimental therapeutics · 2016
    Article
  13. Gas what: NO is not the only answer to sexual function.British journal of pharmacology · 2015
    Review
  14. Article
  15. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 2 countries.

Hicham LabaziGeorgia Health Sciences University, Physiology Department, Augusta, GA, USA.
Brandi M Wynne
Rita Tostes
R Clinton Webb
Augusta University Health · USEmory University · USUniversidade de São Paulo · BR

Funding

Nitric Oxide Inhibits RhoA/Rho-kinase in Penile ErectionR01HL071138 · NHLBI · MEDICAL COLLEGE OF GEORGIA (MCG) · PI WEBB, R CLINTON · 2003 to 2011
$2.9M
TNF-alpha: a key player in erectile (dys)functionR01DK083685 · NIDDK · AUGUSTA UNIVERSITY · PI WEBB, R CLINTON · 2009 to 2012
$1.4M
NHLBI NIH HHS HL71138NHLBI NIH HHS R01 HL071138NIDDK NIH HHS DK83685NIDDK NIH HHS R01 DK083685
6 · The paper itself

Abstract

introductionIncreased angiotensin II (AngII) levels cause hypertension, which is a major risk factor for erectile dysfunction (ED). Studies have demonstrated that increased AngII levels in penile tissue are associated with ED. A recent study showed that metformin treatment restored nitric oxide synthase (NOS) protein expression in penile tissue in obese rats; however, whether metformin treatment can be beneficial and restore erectile function in a model of ED has not yet been established.

aimThe goal of this study was to test the hypothesis that AngII induces ED by means of increased corpus cavernosum contraction, and that metformin treatment will reverse ED in AngII-treated rats.

methodsMale Sprague-Dawley rats were implanted with mini-osmotic pumps containing saline or AngII (70 ng/minute, 28 days). Animals were then treated with metformin or vehicle during the last week of AngII infusion.

main outcome measuresIntracavernosal pressure; corpus cavernosum contraction and relaxation; nNOS protein expression; extracellular signal-regulated kinase (ERK1/2), AMP-activated protein kinase (AMPK), and eNOS protein expression and phosphorylation.

resultsAngII-induced ED was accompanied with an increase in corpus cavernosum contractility, decreased nitrergic relaxation, and increased ERK1/2 phosphorylation. Metformin treatment improved erectile function in the AngII-treated rats by reversing the increased contraction and decreased relaxation. Metformin treatment also resulted in an increase in eNOS phosphorylation at ser1177.

conclusionsMetformin treatment increased eNOS phosphorylation and improved erectile function in AngII hypertensive rats by reestablishing normal cavernosal smooth muscle tone.

Indexed as

Angiotensin IIAMP-Activated Protein KinasesAnimalsAntihypertensive AgentsArterial PressureDisease Models, AnimalErectile DysfunctionHumansHypertensionMaleMetforminMitogen-Activated Protein Kinase 1Mitogen-Activated Protein Kinase 3Nitric Oxide Synthase Type INitric Oxide Synthase Type IIIPenile ErectionAMP-Activated Protein KinasesAngiotensin IIAntihypertensive AgentsMetforminMitogen-Activated Protein Kinase 1Mitogen-Activated Protein Kinase 3Nitric Oxide Synthase Type INitric Oxide Synthase Type IIINos1 protein, ratNos3 protein, ratAngiotensin IICorpus CavernosumeNOSErectile DysfunctionHypertensionMetformin

Identifiers

PMID23889981
PMCPMC4429591
OpenAlexW1938155937

What OpenQuestion holds

Texttitle and abstract
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.