Revisiting the role of ectonucleotidases in synaptic transmission. Thermal sensitivities of ATP-producing metabolic pathways

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The release of ATP as an intermediate at the neuromuscular junction, and acetylcholine, the chief neurotransmitter, may take place by mechanisms responsible for quantal and non-quantal secretion from the motor neurons of the central and peripheral nervous system. The dephosphorylation pathway of ATP that is completed by the hydrolysis of AMP to adenosine in the synaptic cleft is a cascade of reactions catalyzed by ectonucleotidases. These enzymes are of enormous interest, the research in this field is necessary to clarify their role in a complex signaling cascade, since it is known that they have dual functions: ectonucleotidases limit the action of ATP as a neurotransmitter and participate in the formation of other neuromodulators (ADP, AMP and adenosine). In addition, ATP and its metabolites can cause completely different physiological effects. The activity of ectonucleatidases in different types of skeletal muscles was determined, it varies within 5-7 IU. A decrease in temperature to 22°C leads to a multiple decrease in the enzymatic regeneration of ATP in skeletal muscle tissues. It is assumed that enzymatic limitation of ATP and the production of its metabolites ensures stabilization of effective cholinergic neuromuscular transmission in norm and pathology.

作者简介

A. Khairullin

Kazan State Medical University;Kazan Federal University

Email: khajrulli@yandex.ru
Kazan, Russia

D. Efimova

Kazan State Medical University

Email: khajrulli@yandex.ru
Kazan, Russia

D. Ivanova

Kazan State Medical University

Email: khajrulli@yandex.ru
Kazan, Russia

S. Grishin

Kazan State Medical University

Email: khajrulli@yandex.ru
Kazan, Russia

A. Ziganshin

Kazan State Medical University

编辑信件的主要联系方式.
Email: khajrulli@yandex.ru
Kazan, Russia

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