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Related Experiment Videos

Continuous development precludes radioprotection in a colonial ascidian.

Diana J Laird1, Irving L Weissman

  • 1Department of Biological Sciences, Hopkins Marine Station, Stanford University, Ocean View Boulevard, Pacific Grove, CA 93950, USA. dlaird@post.harvard.edu

Developmental and Comparative Immunology
|December 4, 2003
PubMed
Summary

Colonial organism Botryllus schlosseri somatic stem cells are radiosensitive. Radiation exposure, even with cell transplantation, did not improve survival, indicating stem cells are not essential for initial bud development.

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Area of Science:

  • Stem cell biology
  • Marine invertebrate biology
  • Developmental biology

Background:

  • Colonial ascidian Botryllus schlosseri offers a unique model for studying stem cell biology.
  • This organism exhibits both sexual reproduction and asexual budding, and can form chimeras through vascular fusion.

Purpose of the Study:

  • To establish a radioprotection assay for somatic stem cells in Botryllus schlosseri.
  • To investigate the role of stem cells in chimerism and bud development under radiation stress.

Main Methods:

  • Irradiation of Botryllus schlosseri colonies at various doses.
  • Autologous and allogeneic cell transplantation experiments.
  • Observation of colony survival and bud development post-radiation.

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Main Results:

  • Neither autologous nor allogeneic cell transplantation improved host colony survival after radiation exposure.
  • High mitotic activity in asexual development appears to confer radiosensitivity to essential organs.
  • Radiation induced uncontrolled epithelial cell proliferation in buds, independent of stem cells.

Conclusions:

  • Somatic stem cells in Botryllus schlosseri may be radiosensitive, contributing to colony mortality.
  • Stem cells are not required for the initial phases of bud development, even under radiation-induced stress.