Related Experiment Videos
Effect of hydroxyurea on differentiation of mitotically inactive olfactory receptor cells in the frog
1Northwestern University, Department of Neurobiology and Physiology, Evanston, Illinois 60201.
Abstract:
Hydroxyurea is a widely used mitotic suppressant, but its action on nondividing cells remains largely unknown. This is a study of the effect of the drug on the development of newly generated, mitotically inactive olfactory receptor cells in adult frogs. To obtain olfactory epithelia consisting of newly generated cells, the original olfactory epithelia in a group of animals were ablated by irrigation of their nasal cavities with a solution of zinc sulfate in distilled water. The new epithelial cells were then allowed to generate over a period of 10 days. The hydroxyurea treatment was carried out by delivering a 50 mM concentration of the drug in Ringer's solution into the frogs' nasal cavities at a flow rate of 0.40 ml/day continuously for 24 days. Such treatment was capable of suppressing mitotic activity in olfactory epithelia. Morphological and electrophysiological observations of olfactory receptor cells, which were developing during hydroxyurea treatment, did not reveal any notable differences in comparison with olfactory receptor cells in control epithelia treated only with Ringer's solution. Thus the prolonged treatment of olfactory epithelia with hydroxyurea employed in this study, while suppressing mitotic activity in these tissues, did not significantly affect the differentiation of young postmitotic receptor cells.
Insights
Hydroxyurea (HU) suppresses cell division in frog olfactory epithelia. This study found that prolonged HU treatment did not affect the development of new olfactory receptor cells after mitosis.
Area of Science:
- Neuroscience
- Cell Biology
- Pharmacology
Background:
- Hydroxyurea (HU) is a known mitotic suppressant.
- Its effects on nondividing cells, particularly in sensory systems, are not well understood.
- Olfactory receptor cells (ORCs) in adult vertebrates are continuously generated.
Purpose of the Study:
- To investigate the impact of hydroxyurea on the differentiation of newly generated, postmitotic olfactory receptor cells in adult frogs.
- To determine if hydroxyurea affects the development of these cells after cell division has ceased.
Main Methods:
- Olfactory epithelia in adult frogs were ablated using zinc sulfate to generate new cells.
- Hydroxyurea (50 mM) was continuously delivered to the nasal cavities for 24 days to suppress mitotic activity.
- Morphological and electrophysiological methods were used to assess the development of olfactory receptor cells.
Main Results:
- Hydroxyurea treatment successfully suppressed mitotic activity in the olfactory epithelia.
- No significant morphological or electrophysiological differences were observed between hydroxyurea-treated and control olfactory receptor cells.
- The differentiation of young, postmitotic olfactory receptor cells was not notably affected by the prolonged hydroxyurea exposure.
Conclusions:
- Prolonged hydroxyurea treatment effectively inhibits cell proliferation in olfactory epithelia.
- Hydroxyurea does not adversely impact the differentiation or function of newly formed, postmitotic olfactory receptor cells.
- These findings suggest hydroxyurea's potential use in studies involving neurogenesis without compromising neuronal development.