A novel nuclear signaling pathway for thromboxane A2 receptors in oligodendrocytes: evidence for signaling compartmentalization during differentiation.

Molecular and Cellular Biology
Fozia Mir, Guy C Le Breton

Abstract

The present study investigated G protein expression, localization, and functional coupling to thromboxane A(2) receptors (TPRs) during oligodendrocyte (OLG) development. It was found that as OLGs mature, the expression levels of G(q) increase while those of G(13) decrease. In contrast, the expression levels of G(s), G(o), and G(i) do not change significantly. Localization studies revealed that G(q), G(13), and G(i) are present only in the extranuclear compartment, whereas G(s) and G(o) are found in both the extranuclear and the nuclear compartments. Purification of TPR-G protein complexes demonstrated that TPRs couple to both G(q) and G(13) in the extranuclear compartment but only to G(s) in the nuclear compartment. Furthermore, functional analysis revealed that stimulation of nuclear TPR in OLGs stimulates CREB phosphorylation and myelin basic protein transcription and increases survival. Collectively, these results demonstrate that (i) OLGs selectively modulate the expression of certain G proteins during development, (ii) G proteins are differentially localized in OLGs leading to subcellular compartmentalization, (iii) TPRs couple to G(q) and G(13) in the extranuclear compartment and to G(s) only in the nucleus, (iv) mature O...Continue Reading

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Citations

Jul 8, 2015·International Journal of Molecular Sciences·Peter Göttle, Patrick Küry
Nov 21, 2015·Schizophrenia Research·Sarah A MauneyTsung-Ung W Woo
Jun 13, 2013·Journal of Molecular and Cellular Cardiology·Clémence MerlenBruce G Allen
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Oct 27, 2020·IScience·Mohammad Ali Mohammad NezhadySylvain Chemtob
Jun 3, 2021·Pharmaceuticals·Salomé Gonçalves-MonteiroCarmen Diniz

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