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Purinergic receptor
Purinergic receptors, also known as purinoceptors, are a family of plasma membrane molecules that are found in almost all mammalian tissues. Within the field of purinergic signalling, these receptors have been implicated in learning and memory, locomotor and feeding behavior, and sleep. More specifically, they are involved in several cellular functions, including proliferation and migration of neural stem cells, vascular reactivity, apoptosis and cytokine secretion. These functions have not been well characterized and the effect of the extracellular microenvironment on their function is also poorly understood.
The term ''purinergic receptor'' was originally introduced to illustrate specific classes of membrane receptors that mediate relaxation of gut smooth muscle as a response to the release of ATP (P2 receptors) or adenosine (P1 receptors). P2 receptors have further been divided into five subclasses: P2X, P2Y, P2Z, P2U, and P2T. To distinguish P2 receptors further, the subclasses have been divided into families of metabotropic (P2Y, P2U, and P2T) and ionotropic receptors (P2X and P2Z).〔King BF, Burnstock G (2002) Purinergic receptors. In: Pangalos M, Davies C (eds) Understanding G protein-coupled receptors and their role in the CNS. Oxford University Press, Oxford, pp 422– 438〕
In 2014, the first purinergic receptor in plants, DORN1, was discovered.
== 3 classes of purinergic receptors ==
There are three known distinct classes of purinergic receptors, known as P1, P2X, and P2Y receptors.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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