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Biology of Reproduction, Vol 11, 85-92, Copyright © 1974 by Society for the Study of Reproduction

Rapid Movements of the Chromatoid Body in Living Early Spermatids of the Rat

MARTTI PARVINEN 1, and PENTTI T. JOKELAINEN 2

1 Department of Anatomy, University of Turku, SF-20520 Turku 52, Finland
2 Department of Electron Microscopy, University of Turku, SF-20520 Turku 52, Finland


The stages of the seminiferous epithelial cycle are recognizable in freshly isolated rat seminiferous tubules by a simple transillumination technique. By phase contrast microscopy on cells squeezed out from an isolated piece of tubule, the developmental stage of live germinal cells can be accurately determined. The kinetics of some organelles in early postmeiotic spermatids were followed by means of videotape recording and time-lapse cinemicrography. Pieces of tubules containing cells of corresponding developmental stages were prepared for electron microscopy.

Immediately after the second meiotic division the chromatoid body and the Golgi apparatus are dispersed in the cytoplasm of the young spermatid as small dark bodies. But very soon, during stage 1 of spermiogenesis, these organelles assume the compacted form typical of the next stages. This morphogenesis involves the presence of vesicles of continuously and rather rapidly changing configuration.

During stage 2, the chromatoid body rapidly moves on the nuclear envelope. It continuously sends and receives small dark particles and light vesicles and produces transient shallow depressions or occasionally deep indentations in the nuclear envelope. During its movements the chromatoid body also makes transient contacts with the Golgi apparatus. At stage 3 these movements slow down and practically cease at the stage 5.

The rapid nonrandom movements of the chromatoid body and associated granules and vesicles suggest that this organelle participates from the early stages of spermiogenesis in spermatid maturation. The early activities of the chromatoid body, especially at stage I, may be heat labile.

 Accepted on November 16, 1973




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S. Ventela, J. Toppari, and M. Parvinen
Intercellular Organelle Traffic through Cytoplasmic Bridges in Early Spermatids of the Rat: Mechanisms of Haploid Gene Product Sharing
Mol. Biol. Cell, July 1, 2003; 14(7): 2768 - 2780.
[Abstract] [Full Text] [PDF]


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Copyright © 1974 by the Society for the Study of Reproduction.