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Germ Cell-Sertoli Cell Interactions: The Effect of Testicular Maturation on the Synthesis of Cyclic Protein-2 by Rat Sertoli Cells1

1990; Oxford University Press; Volume: 43; Issue: 1 Linguagem: Inglês

10.1095/biolreprod43.1.25

1529-7268

Sonya Zabludoff, Abdul Karzai, William W. Wright,

Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities

Cyclic Protein-2 (CP-2) is synthesized in a stage-specific manner by mature rat Sertoli cells within stage VI and VII seminiferous tubules. To determine how testicular maturation affects CP-2 synthesis, we cultured 20 cm of tubules encompassing all stages of the cycle from rats 17, 35, 45, and 75 days old. The greatest increase in CP-2 synthesis was found to occur between 35 and 45 days and exceeded that observed for transferrin and sulfated glycoprotein (SGP)-2. Additionally, two-dimensional gel analysis indicated that secretion of CP-2 increased from 35 to 45 days to a greater extent than the secretion of SGP-1 and SGP-2 and transferrin. Biochemical analysis also demonstrated that CP-2 synthesis was stage-specific by 45 days. Immunocytochemistry expanded these observations; CP-2 was not detected in 7−35-day-old Sertoli cells. However, at 36 days, CP-2 was detected in Sertoli cells in stage VI and VII tubules but not at any other stage. CP-2 concentration in stage VI-VII tubules was increased by 38 days, but was unchanged thereafter. Finally, we immunocytochemically examined age-related changes in CP-2 concentration of the proximal convoluted kidney tubule. This analysis revealed that, at 1 wk, CP-2 was present in all proximal tubules except those in the subcapsular area; however, by 14 days, CP-2 was detected in all proximal tubules. This comparison of Sertoli cells and proximal tubule cells indicates that CP-2 content is determined by the maturity of a cell and not by the age of the animal.