Evidence map›Paper›PMID 29566165›Full record

ReviewBiology of reproduction2018

Leydig cells: formation, function, and regulation.

Barry R Zirkin, Vassilios Papadopoulos

Open access · bronzeAbstract readReview
In one paragraph

Review in Biology of reproduction, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 312 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
312citing papers in PubMed, 1 pooled it
26.2field-weighted citation impact, top 1% 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

312 citing papers in PubMed, 1 synthesis or guideline pooled it, 664 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Review
  4. Article
  5. Review
  6. Article
  7. Article
  8. The impact of probiotics on testosterone synthesis in the TM3 cell line.Clinical and experimental reproductive medicine · 2026
    Article
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252 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

2 authors at 2 institutions in 1 country.

Barry R ZirkinDepartment of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
Vassilios PapadopoulosDepartment of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, California, USA.
Johns Hopkins University · USUniversity of Southern California · US

Funding

AGING AND LEYDIG CELL FUNCTIONR01AG021092 · NIA · JOHNS HOPKINS UNIVERSITY · PI ZIRKIN, BARRY R · 2002 to 2019
$3.1M
Hypogonadism in Men: Is It Reversible?R21AG051259 · NIA · JOHNS HOPKINS UNIVERSITY · PI ZIRKIN, BARRY R · 2016 to 2017
$446k
NIA NIH HHS R01 AG021092NIA NIH HHS R21 AG051259
6 · The paper itself

Abstract

Herein we summarize important discoveries made over many years about Leydig cell function and regulation. Fetal Leydig cells produce the high levels of androgen (testosterone or androstenedione, depending upon the species) required for differentiation of male genitalia and brain masculinization. Androgen production declines with loss of these cells, reaching a nadir at postpartum. Testosterone then gradually increases to high levels with adult Leydig cell development from stem cells. In the adult, luteinizing hormone (LH) binding to Leydig cell LH receptors stimulates cAMP production, increasing the rate of cholesterol translocation into the mitochondria. Cholesterol is metabolized to pregnenolone by the CYP11A1 enzyme at the inner mitochondrial membrane, and pregnenolone to testosterone by mitochondria and smooth endoplasmic reticulum enzymes. Cholesterol translocation to the inner mitochondrial membrane is mediated by a protein complex formed at mitochondrial contact sites that consists of the cholesterol binding translocator protein, voltage dependent anion channel, and other mitochondrial and cytosolic proteins. Steroidogenic acute regulatory protein acts at this complex to enhance cholesterol movement across the membranes and thus increase testosterone formation. The 14-3-3γ and ε adaptor proteins serve as negative regulators of steroidogenesis, controlling the maximal amount of steroid formed. Decline in testosterone production occurs in many aging and young men, resulting in metabolic and quality-of-life changes. Testosterone replacement therapy is widely used to elevate serum testosterone levels in hypogonadal men. With knowledge gained of the mechanisms involved in testosterone formation, it is also conceivable to use pharmacological means to increase serum testosterone by Leydig cell stimulation.

Indexed as

AnimalsCholesterolHumansLeydig CellsMaleTestisTestosteroneCholesterolTestosterone

Identifiers

PMID29566165
PMCPMC6044347
OpenAlexW2791383766

What OpenQuestion holds

Textmetadata
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.