PMID- 18184909 OWN - NLM STAT- MEDLINE DCOM- 20080318 LR - 20161122 IS - 0077-8923 (Print) IS - 0077-8923 (Linking) VI - 1120 DP - 2007 Dec TI - Gene expression during development of fetal and adult Leydig cells. PG - 16-35 LID - 10.1196/annals.1411.016 [doi] AB - In rats and mice, Leydig cells are formed as two morphologically and functionally different generations. The first generation develops in utero, from undifferentiated stem Leydig cells (SLCs) that differentiate into fetal Leydig cells (FLCs). After birth, SLCs that may differ from the fetal SLCs undergo lineage-specific commitment and give rise to adult Leydig cells (ALCs). The intermediates of ALCs first become apparent by day 11 postpartum. These first-appearing intermediates, progenitor Leydig cells (PLCs), are spindle shaped and identifiable as steroidogenic because they express luteinizing hormone receptor (LHR) and 3beta-hydroxysteroid dehydrogenase (3betaHSD). The next step in the transition of PLCs to ALCs is the appearance of the immature Leydig cells (ILCs), most commonly seen in the testis during days 28 to 56 postpartum. ILCs have a more abundant smooth endoplasm reticulum (SER), the network of membranes providing a scaffold for steroidogenic enzyme localization, compared to PLCs, but are considered immature because they secrete higher levels of 5alpha-reduced androgen than testosterone. ILCs undergo a final division before ALC steroidogenic function matures by postnatal day 56. ALCs mark the point of maximum differentiation, and at this stage, the Leydig cell secretes testosterone at the highest rate. In this review, trends of gene expression during development of the two Leydig-cell generations, and recent information from gene profiling by microarray, are evaluated. The expression profiles are distinct, indicating that FLCs and ALCs may originate from separate pools of stem cells. FAU - Dong, Lei AU - Dong L AD - Department of Pathology, the 1st Affiliated Hospital of Wenzhou Medical College, Zhejiang, 325000, China. FAU - Jelinsky, Scott A AU - Jelinsky SA FAU - Finger, Joshua N AU - Finger JN FAU - Johnston, Daniel S AU - Johnston DS FAU - Kopf, Gregory S AU - Kopf GS FAU - Sottas, Chantal M AU - Sottas CM FAU - Hardy, Matthew P AU - Hardy MP FAU - Ge, Ren-Shan AU - Ge RS LA - eng GR - R01 AG030598/AG/NIA NIH HHS/United States GR - R01 AG030598-01/AG/NIA NIH HHS/United States GR - R01 HD050570/HD/NICHD NIH HHS/United States GR - R01 HD050570-01A2/HD/NICHD NIH HHS/United States PT - Journal Article PL - United States TA - Ann N Y Acad Sci JT - Annals of the New York Academy of Sciences JID - 7506858 SB - IM MH - Adult Stem Cells/metabolism/physiology MH - Age Factors MH - Animals MH - Cell Differentiation/genetics MH - Cell Lineage/genetics MH - Embryo, Mammalian MH - Fetus/*metabolism MH - Gene Expression Profiling MH - *Gene Expression Regulation, Developmental MH - Leydig Cells/*metabolism/*physiology MH - Male MH - Models, Biological MH - Oligonucleotide Array Sequence Analysis MH - Rats MH - Stem Cells/metabolism EDAT- 2008/01/11 09:00 MHDA- 2008/03/19 09:00 CRDT- 2008/01/11 09:00 PHST- 2008/01/11 09:00 [pubmed] PHST- 2008/03/19 09:00 [medline] PHST- 2008/01/11 09:00 [entrez] AID - 1120/1/16 [pii] AID - 10.1196/annals.1411.016 [doi] PST - ppublish SO - Ann N Y Acad Sci. 2007 Dec;1120:16-35. doi: 10.1196/annals.1411.016.