Abstract
Expression of a glutamate transporter (EAAC1), a lipocalin (MEP17) and β-galactosidase (β-Gal) in histological sections was used to monitor post-natal development of the murine epididymis. Three epithelia in the adult caput of wild-type mice were distinguished: I, the initial segment; II, the proximal caput; and III, the distal caput. The regions in which epithelia I, II and III were situated were called regions I, II and III, respectively. Regions I, II and III developed from a precursor epithelium present on day 14; from day 16, a presumptive region I epithelium was evident and, by day 21, epithelia characteristic of future regions II and III appeared. The relationship between the c-ros gene and the initial segment was studied by investigating the development of the caput epididymidis in transgenic homozygous c-ros knockout (−/−) mice that lack the initial segment, heterozygous (+/−) males and wild-type males in which the efferent ducts had been ligated prepubertally so that the initial segment failed to develop. In mice with prepubertally ligated efferent ducts, regions II and III developed normally but region I was missing in the adult and expression of c-ros was partially decreased. In (−/−) mice, the precursor epithelium was present, differentiation of epithelium II was delayed until day 32 and epithelium I never developed. Thus, caput region I develops before c-ros expression, high testosterone secretion and differentiation of regions II and III but not if the organ is deprived of the oncogene c-ros or testicular exocrine secretions. The caput of the knockout male lacks solely the initial segment so that the efferent ducts are in continuity with the post-initial segment, proximal caput region. The ligand for c-ros may be present in testicular fluid and both ligand and receptor may be necessary for differentiation of epithelia I and II.
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Acknowledgements
This work was funded by the Deutsche Forschungsgemeinschaft (“the male gamete: production, maturation, function”, FOR 197/3-1). We thank Prof. Marie-Claire Orgebin-Crist for the generous gift of anti-MEP17 antiserum and Prof. E. Nieschlag for his continued support.
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This work was funded by the Deutsche Forschungsgemeinschaft (“the male gamete: production, maturation, function”, FOR 197/3-1)
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Avram, C.E., Cooper, T.G. Development of the caput epididymidis studied by expressed proteins (a glutamate transporter, a lipocalin and β-galactosidase) in the c-ros knockout and wild-type mice with prepubertally ligated efferent ducts. Cell Tissue Res 317, 23–34 (2004). https://doi.org/10.1007/s00441-004-0892-8
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DOI: https://doi.org/10.1007/s00441-004-0892-8