‬The expression of purinergic P2X4 and P2X7 receptors in selected mesolimbic structures during morphine withdrawal in rats.

A new interesting article has been published in Brain Res. 2019 May 20. pii: S0006-8993(19)30280-X. doi: 10.1016/j.brainres.2019.05.025. and titled:

‬The expression of purinergic P2X4 and P2X7 receptors in selected mesolimbic structures during morphine withdrawal in rats.

Authors of this article are:

Metryka E, Gutowska I, Kupnicka P, Tarnowski M, Tkacz M, Listos J, Talarek S, Barczak K, Chlubek D, Baranowska-Bosiacka I.

A summary of the article is shown below:

Morphine is one of the most potent analgesics used in medicine and it’s long-term use is associated with the risk of the state of dependence. The cessation of chronic morphine administration leads to withdrawal signs which are associated with neurotransmitter dysregulations within mesolimbic system. Adenosine 5′-triphosphate (ATP) and purinergic system play an important role in the activity of central nervous system (CNS). Purinergic receptors are widely distributed in neurons and glial cells throughout the CNS taking part in integration of functional activity between neurons, glial and vascular cells. In the present study the mRNA and protein expression of purinergic P2X4 and P2X7 receptors in selected mesolimbic structures (striatum, hippocampus and prefrontal cortex) during morphine withdrawal in rats was investigated by RT-PCR and Western Blot analysis. Two experimental models of morphine withdrawal were studied: single and repeated morphine withdrawal. We demonstrated that expression of P2X4 and P2X7 receptors was altered during morphine withdrawal period in rats. These alterations were varied in particular mesolimbic areas depending on the scheme of morphine administration. Our results extend the current knowledge on morphine withdrawal and for the first time high-light interactions between purinergic system and morphine withdrawal. It seems, the purinergic system may be a new, valuable tool in searching for a new strategy of management of opioid dependence.Copyright © 2019. Published by Elsevier B.V.

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This article is a good source of information and a good way to become familiar with topics such as: P2X4 receptors; P2X7 receptors; addiction; inflammation; morphine; purinergic receptors.