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Glucose-induced inhibition: how many ionic mechanisms?
1Department of Pharmacology, University of Cambridge, Cambridge, UK. dib22@cam.ac.uk
Acta Physiologica (Oxford, England)
|May 29, 2009
Summary
Cells sense sugar to maintain energy balance, often using potassium (K+) currents. However, the exact channels and how they activate remain unclear, with evidence suggesting multiple channel types may be involved.
Area of Science:
- Physiology
- Molecular Biology
- Neuroscience
Background:
- Organisms regulate internal energy levels by sensing sugar.
- Glucose sensing often involves stimulation of plasma membrane potassium (K+) currents.
- The molecular identity and activation mechanisms of these glucose-sensitive channels are debated.
Purpose of the Study:
- To review the ionic and pharmacological properties of glucose-induced inhibition.
- To discuss potential molecular correlates of glucose sensing.
- To explore the diversity of K+ channels involved in glucose sensing.
Main Methods:
- Review of existing literature on glucose-induced ion channel activity.
- Analysis of ionic and pharmacological data from various cell types.
- Comparison of findings across different species and tissues.
Main Results:
- Glucose stimulates K+ currents in hypothalamic neurons and crab neurosecretory cells, exhibiting leak-like properties.
- Studies on KCNK gene family knockouts have not fully explained glucose inhibition in hypothalamic cells.
- Glucose-stimulated K+ channels can be voltage-gated in some tissues, like the carotid body.
- Alternative mechanisms, including Cl- channel opening and K(ATP) channel closure, are also proposed.
Conclusions:
- Glucose-induced inhibition involves complex cellular mechanisms.
- Multiple types of K+ channels, not exclusively leak channels, may mediate glucose sensing.
- Further research is needed to elucidate the precise molecular players in glucose-regulated cellular functions.
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