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  • Cell & Developmental Biology  (1)
  • Morphometry  (1)
  • 1
    ISSN: 1432-0878
    Keywords: Leydig cell ; Testis ; Interstitium ; Aging ; Ultrastructure ; Morphometry ; Testosterone ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The ultrastructure of testicular interstitium in young and aged adult rats was analysed using morphometric methods, and the plasma testosterone concentration was measured. With increasing age there was an augumentation in the volume of collagen fibrils in the intercellular matrix and in blood vessels. During the aging process (approximately two years) the average volume of the Leydig cell decreased from 1364 μm3 to 637 μm3, but the number of Leydig cells in paired testes increased from 53x106 to 113x106. The absolute volume of smooth surfaced endoplasmic reticulum (SER) per Leydig cell amounted in aged rats to 78% of that in young adult rats. The total amount of SER in paired testes increased by 62% with aging. The present analysis suggests that the ability of SER to maintain peripheral testosterone concentration decreases with age. In young adult rats the absolute volume of peroxisomes per Leydig cell correlated significantly with the concentration of testosterone in blood and also with the absolute volume of SER per Leydig cell. These results combined with ultrastructural observations of close apposition of peroxisomes and SER suggest that peroxisomes have a role in testosterone secretion by Leydig cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 163 (1969), S. 595-601 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: In combination with biochemical determination of cholesterol in testes, cholesterol was studied histochemically in the testicular interstitial cells of dd strain mice from 5 to 63 days.Cholesterol is found in interstitial cells at five days and cholesterol positive interstitial cells increase significantly from 7% at 5 days to 47% at 21 days (17% at 7 days, 21% at 10 days and 31% at 14 days) and thereafter gradually to 58% at 63 days (50% at 28 days, 54% at 35 days, 56% at 42 days, 58% at 49 days and 57% at 56 days).The cholesterol concentration of testes (μg of cholesterol per mg testicular weight) remains at low values before 42 days (1.33 at 5 days, 2.12 at 7 days, 1.89 at 10 days, 2.18 at 14 days, 2.16 at 21 days, 1.63 at 28 days and 2.09 at 35 days) but it increases rapidly at days 42-49 (2.21 at 42 days and 5.16 at 49 days) and then it is almost unchanged (5.47 at 56 days and 5.18 at 63 days).From these results it is suggested that (1) at five days testicular steroid could be elaborated and (2) the capacity of interstitial cells to produce testicular steroid elevates actively from 42 to 49 days.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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