S.M. MARCHENKO, O.A. FEDORENKO, V.V. YAROTSKY, D.E. DUZHYI (2020) 'PROPERTIES OF NEURONAL INOSITOL 1,4,5-TRISPHOSPHATE RECEPTORS/ Ca2+-RELEASE CHANNELS' in O.A. Krishtal, E.A. Lukyanetz (Eds.), ESSAYS ON NEUROPHYSIOLOGY BY PLATON KOSTYUK AND HIS STUDENTS, AKADEMPERIODYKA, pp. 267-271
PROPERTIES OF NEURONAL INOSITOL 1,4,5-TRISPHOSPHATE RECEPTORS/ Ca2+-RELEASE CHANNELS
S.M. MARCHENKO1, O.A. FEDORENKO1,2, V.V. YAROTSKY1,3, D.E. DUZHYI1
- Bogomoletz Institute of physiology NAS of Ukraine, Kyiv, Ukraine;
- Universitй de Picardie Jules Verne, Amiens, France
- Penn State College of Medicine, Hershey, USA
DOI: https://doi.org/10.15407/biph.books.EssNeur.267

Abstract
Inositol 1,4,5-trisphosphate receptors (InsP3Rs) are a major type of intracellular Ca2+ release channels localized redominantly in the endoplasmic reticulum. Notwith-standing numerous investigations, there is a significant controversy on the basic properties of these receptors. There is also a long-standing controversy on the role of the nuclear envelope in the regulation of nuclear Ca2+. To address these issues, we have studied native InsP3Rs in the nuclear membrane of mammalian cells. The nuclear envelope is the only part of the endoplasmic reticulum readily accessible for patch-clamp recording. Very high levels of expression of InsP3Rs were reported for some types of neurons. Investigation of neuronal nuclei is hampered by the cellular heterogeneity of the brain where neurones comprise no more than 10% of the cells. We have developed methods for isolation of cell nuclei from identified types of central neurons . Here we report some recent data on the properties of neuronal InsP3Rs.
Keywords:
Inositol 1,4,5-trisphosphate receptors (InsP3Rs), calcium signaling, nuclear membrane, Purkinje neurons, hippocampal pyramidal neurons, patch-clamp electrophysiology, Ca²⁺-dependent desensitization, intracellular Ca²⁺ release, transient Ca²⁺ signals, endoplasmic reticulum, neuronal excitability.
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