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Transferrin can alter physiological properties of retinal neurons
A G Hyndman1, P E Hockberger, G D Zeevalk
1Department of Biological Sciences, Rutgers University, Piscataway, NJ 08855.
Brain Research
|October 11, 1991
Summary
Transferrin may act as a neurotransmitter in the developing nervous system. Studies show it increases intracellular calcium and affects neuronal signaling in chick retinal cells.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Transferrin is primarily known for iron transport.
- Its potential role in neuronal signaling is largely unexplored.
Purpose of the Study:
- To investigate transferrin's function as a neurotransmitter or neuromodulator.
- To examine transferrin's effects on intracellular calcium and neuronal activity in cultured chick retinal cells.
Main Methods:
- Cell culture of chick retinal neurons.
- Measurement of intracellular calcium levels.
- Electrophysiological recordings (membrane depolarization, voltage clamp).
- Analysis of glutamate binding.
Main Results:
- Transferrin induced a transient increase in intracellular calcium in ~20% of retinal neurons.
- Transferrin caused membrane depolarization in bipolar-like neurons.
- Transferrin-evoked currents showed non-linear voltage dependence, similar to glutamate.
- Transferrin exposure increased Na+-independent [3H]glutamate binding by 200%.
Conclusions:
- Transferrin exhibits properties consistent with a neurotransmitter or neuromodulator role.
- These findings suggest a novel function for transferrin in the developing vertebrate nervous system.