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Regional variations in the tightness of the ectodermal epithelium in the developing chick embryo: a study using
1Department of Physiological Sciences, Medical School, University of Newcastle, England.
The Journal of Experimental Zoology
|August 1, 1990
Summary
This study investigates the ion concentrations in avian embryos, revealing how potassium and calcium gradients may explain developmental pH differences. These findings shed light on early embryonic development and ion transport mechanisms.
Area of Science:
- Developmental Biology
- Cell Physiology
- Biophysics
Background:
- A rostro-caudal gradient of interstitial pH exists in 2-day-old avian embryos.
- The developmental significance and cellular mechanisms of this pH gradient are not well understood.
Purpose of the Study:
- To investigate interstitial potassium and calcium ion concentrations in avian embryos.
- To explore the movement of these ions across the ectodermal epithelium.
- To propose a mechanism for the observed longitudinal pH gradient.
Main Methods:
- Measurement of interstitial potassium and calcium ion concentrations using ion-sensitive and conventional microelectrodes.
- Experiments involved avian embryos bathed in solutions with varying potassium and calcium concentrations.
Main Results:
- Potassium concentrations showed a rostro-caudal gradient, influenced by external potassium levels.
- Calcium concentrations also exhibited a gradient, varying with external calcium concentrations.
- Intra-embryonic ion gradients can be generated based on extra-embryonic ion concentrations.
Conclusions:
- Interstitial ion gradients, specifically for potassium and calcium, are present in avian embryos.
- These ion gradients likely contribute to the previously observed rostro-caudal pH gradient.
- The findings provide insights into ion transport and its role in embryonic development.