Expression of DDX25 in nuage components of mammalian spermatogenic cells: immunofluorescence and immunoelectron microscopic study |
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Authors: | Yuko Onohara Sadaki Yokota |
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Institution: | (1) Section of Functional Morphology, Faculty of Pharmaceutical Sciences, Nagasaki International University, Huis Ten Bosch 2825-7, Nagasaki, Sasebo 859-3298, Japan; |
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Abstract: | The localization of DDX25/GRTH and gonadotropin-stimulated RNA helicase was studied in the spermatogenic cells of rat, mouse,
and guinea pig by immunofluorescence and immunoelectron microscopy (IEM). Immunofluorescence studies identified four kinds
of granular staining: (1) fine particles observed in meiotic cells; (2) small granules associated with a mitochondrial marker,
appearing in pachytene spermatocytes after stage V; (3) short strands lacking the mitochondrial marker in late spermatocytes;
and, (4) large irregularly shaped granules in round spermatids. IEM identified DDX25 signals in nine compartments: (1) fine
dense particles in the meiotic cells; (2) intermitochondrial cement; (3) loose aggregates of 70–90 nm particles; (4) chromatoid
bodies; (5) late chromatoid bodies; (6) satellite bodies; (7) granulated bodies; (8) mitochondria-associated granules; and,
(9) reticulated bodies. Compartments (1) to (6) were previously classified into nuage while (7) to (9) were classified as
nuage components by the present study. The results suggest that DDX25 functions in these nine compartments. |
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