Histogenesis of human extraparenchymal Leydig cells
作者:
Manuel Nistal,
Ricardo Paniagua,
期刊:
Cells Tissues Organs
(Karger Available online 1979)
卷期:
Volume 105,
issue 2
页码: 188-197
ISSN:1422-6405
年代: 1979
DOI:10.1159/000145122
出版商: S. Karger AG
关键词: Extraparenchymal Leydig cells;Ectopic Leydig cells;Testicular nerves;Leydig cell differentiation
数据来源: Karger
摘要:
From 64 consecutive autopsies of patients with neither testicular nor hormonal pathology, 26 showed extraparenchymal Leydig cells, located mainly in the epididymis and in the spermatic cord. The ultrastructural study of these specimens plus those obtained from 2 patients affected with functional testicular tumors leads to the following conclusions: (1) The origin of ectopic Leydig cells is not interstitial Leydig cells having infiltrated the testicular nerves and migrated along them towards ectopic locations. (2) The ectopic Leydig cells are considered to develop from undifferentiated precursor cells, located extraparenchymally, mainly inside and beside the testicular nerves. These precursor cells are similar to those observed in the testicular interstitium and have an ovoid shape and some cytoplasmic projections. The cytoplasm contains vesicles of smooth endoplasmic reticulum, lysosomes, lipid droplets and abundant microfilament bundles. The transformation from these cells into mature Leydig cells implies a progressive differentiation of the cytoplasmic components involved in steroid biosynthesis.
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