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a Department of Anatomy and
b Institute of Reproduction and Development, Monash University, Clayton, Victoria, 3168, Australia
Sertoli cell proliferation in the rat is completed by Days 15–20 postnatally. Thyroid hormones appear to regulate the duration of Sertoli cell proliferation, affecting adult Sertoli cell number and hence the capacity of the testis to produce sperm. In the present study, a combination of immunohistochemistry, immunoblot analysis, and reverse transcription-polymerase chain reaction was used to demonstrate the expression pattern of thyroid hormone receptors (TR) in the juvenile and adult rat testis. The results indicated that TR
1 was expressed in proliferating Sertoli cell nuclei, its expression decreasing coincident with the cessation of proliferation. TR2, TR3, and TRß1 mRNAs were expressed at low levels during development; however, the corresponding protein was not detected by immunoblot analysis. In addition, TR1 was found to be expressed in germ cells from intermediate spermatogonia to mid-cycle pachytene spermatocytes. Immunohistochemistry also demonstrated TR expression in a subset of interstitial cells. The demonstration of TR expression in germ cells undergoing spermatogenic differentiation suggests a possible role for thyroid hormones in the adult testis.
1 This work was supported by ARC grants (Grant A09600657 and A09927208). M.K.O.B. is supported by a National Health and Medical Research Council (Australia) post-doctoral fellowship.
2 Correspondence: G. Wreford, Department of Anatomy, Monash University, Wellington Road, Clayton, Victoria, 3168, Australia. FAX: 61 3 9905 2766. nigel.wreford{at}med.monash.edu.au
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