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Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They can secrete testosterone and are often closely related to nerves. Leydig cells have round vesicular nuclei and a granular eosinophilic cytoplasm.
Additional recommended knowledge
Leydig cells release a class of hormones called androgens (19-carbon steroids). They secrete testosterone, androstenedione and dehydroepiandrosterone (DHEA), when stimulated by the pituitary hormone luteinizing hormone (LH). LH increases cholesterol desmolase activity (an enzyme associated with the conversion of cholesterol to pregnenolone), leading to testosterone synthesis secretion by Leydig cells.
Follicle-stimulating hormone (FSH) increases the response of Leydig cells to LH by increasing the number of LH receptors expressed on Leydig cells.
Leydig cells are polygonal, eosinophilic cells with a round vesicular nucleus and contain lipid droplets. They contain abundant smooth endoplasmic reticulum, which accounts for their eosinophilia. Frequently, lipofuscin pigment and rod-shaped crystal-like structures (Reinke's crystals) are found.
Leydig cells form during the 16th and 20th week of gestation and are quiescent until puberty.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Leydig_cell". A list of authors is available in Wikipedia.|