Endocrinology, Vol 131, 1107-1114, Copyright © 1992 by Endocrine Society

ARTICLES

Developmental changes in levels of luteinizing hormone receptor and androgen receptor in rat Leydig cells

LX Shan and MP Hardy
Population Council, New York, New York 10021.

To further assess the hormonal response capabilities of Leydig cell progenitors (PLC) from 21-day-old rats, their levels of LH and androgen receptors (LH-R and AR) were measured and compared to those of isolated immature (ILC) and adult Leydig cells (ALC) from 35- and 90-day-old rats, respectively. Levels of LH receptor were estimated by Scatchard analysis of binding to [125I]hCG, and levels of LH receptor mRNA were determined by Northern blot analysis using a rat LH receptor antisense RNA probe. The numbers of LH receptors per cell measured by the binding study were 2,623 +/- 1,110 in PLC, 9,024 +/- 1,992 in ILC, and 39,896 +/- 15,234 in ALC (mean +/- SEM of four replicate experiments; ALC significantly greater than either PLC or ILC at P less than 0.05). The Northern blotting revealed three major bands [6.7, 2.6, and 2.3 kilobases (kb)] that were present in Leydig cells at all three ages and were not detected in HepG2 cells. When the steady state levels of the predominant 6.7-kb species were normalized to actin mRNA, PLC were 6.3- fold lower than ILC and 1.7-fold lower than ALC (n = 3 replicate isolations of poly(A) RNA). The 2.6- and 2.3-kb species exhibited similar trends. Levels of AR were estimated by immunoblotting using a polyclonal antibody against a synthetic peptide of the receptor (residues 14-32) that detected a 110-kilodalton AR protein. Levels of AR mRNA were estimated by Northern blot analysis, using a rat AR antisense RNA probe that detected a single 10-kb AR mRNA. The relative levels of AR protein were 1.0, 1.5, and 0.5 in PLC, ILC, and ALC, respectively (n = 3). Similar trends were observed for AR mRNA (n = 3). The observation that both LH and AR levels were lower in PLC compared to ILC is consistent with the hypothesis that the former are progenitors of Leydig cells.

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