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 ABC  Vol.8 No.3 , June 2018
The Flow of Information from Nucleus to Golgi Is Contingent upon Nuclear Membrane Synthesis and Protraction of the Ceramide-Containing Membrane to Endoplasmic Reticulum
Abstract: The nucleus-initiated augmentation of ER membrane is reflected in a coordinated synthesis and intercalation of the explicit proteins and lipids required for the replacement, repair and function of the cell and its organelles. The direct connection between nucleus and the membranes containing labeled sphingosine (SphN) and ceramide (Cer) was affirmed by determining synthetic activity of serine palmitoyltransferase (SPT). The SPT and the newly synthesized serine-labeled lipid products were identified in the Outer- and Inner-Nuclear Membrane (ONM, INM) and ER. The pulse-chase experiments disclosed that the incorporation of radiolabeled lipids into both nuclear membranes declined upon their simultaneous increase in Endoplasmic Reticulum (ER). These results, and prior findings regarding metabolic transfer of nuclear membrane phosphoinositides to the outer leaflet of ER [Slomiany and Slomiany, Health, 2011, 3, 187-199], allowed us to reason that INM and ONM are not distinct entities, but uninterrupted continuum facing nucleosol and then cytosol when protracted into segment known as ER. Consequently, the identification of SPT and its products in the inner leaflet of nuclear and ER microsomes lent credence to the luminal presence of Cer in Golgi, luminal synthesis of glycosphingolipids (GSphLs), sphingomyelin (SM), and their delivery to the outer leaflet of apical and basolateral cell membrane, respectively. The findings presented in this communication provide further support to our concept that the factual intercalation of proteins and lipids into the cell membranes can only take place during their simultaneous synthesis that is guided by the nuclear and cytosolic processes enacted in nuclear-ER membrane continuum. At the nuclear stage, the signal-specific genes expression promotes active synthesis and intercalation of lipids into the organelles’ customized membrane that is protracted and articulated in ER in form of transport vesicles.
Cite this paper: Slomiany, A. and Slomiany, B. (2018) The Flow of Information from Nucleus to Golgi Is Contingent upon Nuclear Membrane Synthesis and Protraction of the Ceramide-Containing Membrane to Endoplasmic Reticulum. Advances in Biological Chemistry, 8, 47-68. doi: 10.4236/abc.2018.83005.
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