Related Experiment Videos
Pacemaker calcium oscillations in thalamic astrocytes in situ
1School of Biosciences, Cardiff University, Museum Avenue, PO Box 911, Cardiff, CF10 3US, UK.
Neuroreport
|December 14, 2001
Summary
Thalamic astrocytes exhibit rhythmic calcium oscillations, acting as pacemakers. These rhythmic oscillations may drive synchronized neuronal activity in the developing thalamocortical loop.
Area of Science:
- Neuroscience
- Cellular Neuroscience
- Astrocyte Biology
Background:
- Astrocytes in the ventrobasal thalamus show spontaneous intracellular calcium [Ca(2+)](i) oscillations during development.
- These calcium oscillations can excite nearby thalamocortical neurons through NMDA receptors.
Purpose of the Study:
- To investigate the nature of spontaneous calcium oscillations in developing thalamic astrocytes.
- To determine if a subset of astrocytes exhibits rhythmic, pacemaker-like calcium oscillations.
- To explore the potential implications of these oscillations for neuronal activity.
Main Methods:
- Monitoring intracellular calcium ([Ca(2+)](i)) dynamics in developing thalamic astrocytes.
- Analyzing the frequency and amplitude patterns of spontaneous calcium oscillations.
- Comparing rhythmic oscillations with irregular oscillations in astrocytes.
Main Results:
- A subset of spontaneously active thalamic astrocytes displays regular, rhythmic [Ca(2+)](i) oscillations (pacemakers).
- The average frequency of these pacemaker oscillations is approximately 0.019 Hz.
- This pacemaker frequency is similar to the modal frequency of irregularly oscillating astrocytes, indicating a preferred oscillation frequency.
Conclusions:
- Developing thalamic astrocytes can exhibit pacemaker-like calcium oscillations.
- These rhythmic oscillations suggest a potential mechanism for driving rhythmic neuronal activation.
- Pacemaker astrocyte oscillations may contribute to synchronized activity within the thalamocortical loop.