Membrane channel
Membrane channels are a family of
endocannabinoids (eCBs) as molecules that can regulate the opening of these channels during diverse conditions.[1]
Properties
Hemichannels
A hemichannel is a membrane channel made up of six subunits.[2] A hemichannel is defined as one-half of a gap junction channel.[3] Hemichannels consist of connexins.[2]
Pannexin
Pannexins are involved in the process of purinergic signalling. They release adenosine triphosphate (ATP), which activate purinergic receptors. On the other hand, purinergic receptor activation can also lead to the opening of the channel, via a positive feedback loop.[4] In addition, P2Y receptors activate inositol trisphosphate, which leads to a transient increase in intracellular calcium, and opens both connexin and pannexin channels, therefore contributing to the propagation of calcium waves across astrocytes and epithelial cells.[4]
References
Further reading
- Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P (2002). Molecular Biology of the Cell (4th ed.). New York and London: Garland Science. ISBN 9780815332183.
See Glossary, under "membrane channels".