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Leydig cell stem cells: Identification, proliferation and differentiation.

Haolin Chen1, Yiyan Wang2, Renshan Ge2

  • 1Center for Scientific Research, Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China; Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.

Molecular and Cellular Endocrinology
|October 17, 2016
PubMed
Summary
This summary is machine-generated.

Adult Leydig stem cells (SLCs) in the testis regenerate Leydig cells. Desert hedgehog (DHH) signaling promotes SLC proliferation and differentiation into testosterone-producing cells, offering potential treatments for androgen deficiency.

Keywords:
CD90COUP-TFIIDHHLeydig cellStem cell

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Area of Science:

  • Reproductive biology
  • Stem cell research
  • Endocrinology

Background:

  • Adult Leydig cells originate from quiescent stem Leydig cells (SLCs) in the adult testis.
  • SLCs reside in interstitial, peritubular, and perivascular niches and can regenerate Leydig cells.
  • Key markers for identifying SLCs include nestin, PDGFRα, COUP-TFII, CD51, and CD90.

Purpose of the Study:

  • To investigate the regulation of stem Leydig cell (SLC) proliferation and differentiation.
  • To identify signaling pathways that control SLC fate.
  • To explore the therapeutic potential of regulating SLCs for androgen deficiency.

Main Methods:

  • Analysis of protein markers for SLC identification.
  • Investigating the effects of various growth factors and signaling pathways (DHH, FGF2, PDGFBB, activin, TGFβ, androgen, PKA, Notch, Wnt) on SLC proliferation and differentiation.
  • Assessing the role of Desert hedgehog (DHH) in SLC commitment to the Leydig lineage.

Main Results:

  • SLC proliferation is stimulated by DHH, FGF2, PDGFBB, activin, and PDGFAA, but suppressed by TGFβ, androgen, and PKA signaling.
  • SLC differentiation into Leydig cells is promoted by DHH, lithium, and activin, while inhibited by TGFβ, PDGFBB, FGF2, Notch, and Wnt signaling.
  • DHH alone induces SLC differentiation into luteinizing hormone (LH)-responsive steroidogenic cells, highlighting its critical role in Leydig cell lineage commitment.

Conclusions:

  • Stem Leydig cells (SLCs) are regulated by complex signaling networks.
  • Desert hedgehog (DHH) is a key regulator of SLC proliferation and differentiation, crucial for Leydig cell development.
  • Understanding SLC regulation offers potential therapeutic strategies for androgen deficiency and related conditions.