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Ionic induction of the frog cement-gland cell from presumptive ectodermal tissues
Journal of Embryology and Experimental Morphology
|February 1, 1981
Summary
Early frog embryo cells differentiate into cement gland cells with high salt concentrations. Lower salt levels promote epidermal cell development, while very low salt inhibits differentiation.
Area of Science:
- Developmental biology
- Cell differentiation
- Amphibian embryology
Background:
- The presumptive ectoderm of Rana japonica embryos contains cells capable of differentiating into various cell types.
- Environmental factors, such as salinity, can influence cell fate during embryonic development.
Purpose of the Study:
- To investigate the effect of varying NaCl concentrations on the differentiation of superficial ectoderm cells from early gastrulae.
- To determine the optimal conditions for inducing cement gland cell (CGC) differentiation.
Main Methods:
- Explanting superficial ectoderm cells from Rana japonica gastrulae (stage 10).
- Culturing explants in Barth's solution with varying NaCl concentrations (15-130 mM).
- Optimizing stimulation and culture conditions (e.g., NaCl concentration, duration, temperature) for CGC induction.
Main Results:
- Cells differentiated into CGCs at 90-130 mM NaCl and epidermal/cilia cells at 20-40 mM NaCl.
- No differentiation occurred below 15 mM NaCl.
- Optimal CGC induction involved 130 mM NaCl stimulation for 6-10 hours at 18°C, followed by 15-40 mM NaCl culture, yielding ~85% CGCs.
- Similar induction percentages were achieved with KCl, RbCl, sucrose, or mannitol stimulation.
Conclusions:
- NaCl concentration is a critical factor in directing cell differentiation in early amphibian embryos.
- Specific salinity levels can induce specialized cell fates, like cement gland cells.
- The superficial ectoderm at stages 10-11 is most responsive to these differentiation cues.