Evidence map›Paper›PMID 25700847›Full record

ReviewExperimental gerontology2015

Leydig cell aging and hypogonadism.

M C Beattie, L Adekola, V Papadopoulos, H Chen, B R Zirkin

Open access · greenAbstract readReview
In one paragraph

Review in Experimental gerontology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers.

0numbers the graph read from it
0cells of the map it votes in
64citing papers in PubMed
5.6field-weighted citation impact, top 3% 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

64 citing papers in PubMed, 134 citations in OpenAlex.

  1. Review
  2. Review
  3. Article
  4. Article
  5. Review
  6. Review
  7. Article
  8. Article
  9. Review
  10. Article
  11. Review
  12. Mechanisms of Leydig Cell Aging and Obesity-Related Hypogonadism in Men: A Review.Medical science monitor : international medical journal of experimental and clinical research · 2025
    Review
  13. Article
  14. Article
  15. Review
  16. Age-related testosterone decline: mechanisms and intervention strategies.Reproductive biology and endocrinology : RB&E · 2024
    Review
  17. Review
  18. Frontiers in toxicology · 2024
    Article
  19. Review
  20. Article

4 more citing papers are in PubMed but not listed here.

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

5 authors at 2 institutions in 2 countries.

M C BeattieDepartment of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA.
L AdekolaDepartment of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA.
V PapadopoulosThe Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada; Department of Medicine, McGill University, Montreal, Quebec, Canada; Department of Biochemistry and Pharmacology, McGill University, Montreal, Quebec, Canada; Department of Therapeutics, McGill University, Montreal, Quebec, Canada.
H ChenDepartment of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA.
B R ZirkinDepartment of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA. Electronic address: brzirkin@jhu.edu.
Johns Hopkins University · USMcGill University Health Centre · CA

Funding

Aging and Leydig Cell FunctionR37AG021092 · NIA · JOHNS HOPKINS UNIVERSITY · PI ZIRKIN, BARRY R · 2006 to 2015
$4.0M
Antioxidant Defense System and Leydig Cell AgingR03AG026721 · NIA · JOHNS HOPKINS UNIVERSITY · PI CHEN, HAOLIN · 2006 to 2007
$161k
Canadian Institutes of Health Research MOP125983NIA NIH HHS R03 AG026721NIA NIH HHS R37 AG021092
6 · The paper itself

Abstract

Leydig cell testosterone (T) production is reduced with age, resulting in reduced serum T levels (hypogonadism). A number of cellular changes have been identified in the steroidogenic pathway of aged Leydig cells that are associated with reduced T formation, including reductions in luteinizing hormone (LH)-stimulated cAMP production, the cholesterol transport proteins steroidogenic acute regulatory (STAR) protein and translocator protein (TSPO), and downstream steroidogenic enzymes of the mitochondria and smooth endoplasmic reticulum. Many of the changes in steroid formation that characterize aged Leydig cells can be elicited by the experimental alteration of the redox environment of young cells, suggesting that changes in the intracellular redox balance may cause reduced T production. Hypogonadism is estimated to affect about 5 million American men, including both aged and young. This condition has been linked to mood changes, worsening cognition, fatigue, depression, decreased lean body mass, reduced bone mineral density, increased visceral fat, metabolic syndrome, decreased libido, and sexual dysfunction. Exogenous T administration is now used widely to elevate serum T levels in hypogonadal men and thus to treat symptoms of hypogonadism. However, recent evidence suggests that men who take exogenous T may face increased risk of stroke, heart attack, and prostate tumorigenesis. Moreover, it is well established that administered T can have suppressive effects on LH, resulting in lower Leydig cell T production, reduced intratesticular T concentration, and reduced spermatogenesis. This makes exogenous T administration inappropriate for men who wish to father children. There are promising new approaches to increase serum T by directly stimulating Leydig cell T production rather than by exogenous T therapy, thus potentially avoiding some of its negative consequences.

Indexed as

AnimalsCellular SenescenceHormone Replacement TherapyHumansHypogonadismLeydig CellsMalePhosphoproteinsRatsReceptors, GABASteroidogenic Acute Regulatory ProteinTestosteronePhosphoproteinsReceptors, GABASteroidogenic Acute Regulatory ProteinTestosteroneTSPO protein, humanAgingHypogonadismTestosteroneTSPO

Identifiers

PMID25700847
PMCPMC5662440
OpenAlexW2056583090

What OpenQuestion holds

Textmetadata
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.