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375 results on '"Saiardi, Adolfo"'

31. MINPP1 prevents intracellular accumulation of the chelator inositol hexakisphosphate and is mutated in Pontocerebellar Hypoplasia

Author

Ucuncu, Ekin, Rajamani, Karthyayani, Wilson, Miranda S. C., Medina-Cano, Daniel, Altin, Nami, David, Pierre, Barcia, Giulia, Lefort, Nathalie, Banal, Céline, Vasilache-Dangles, Marie-Thérèse, Pitelet, Gaële, Lorino, Elsa, Rabasse, Nathalie, Bieth, Eric, Zaki, Maha S., Topcu, Meral, Sonmez, Fatma Mujgan, Musaev, Damir, Stanley, Valentina, Bole-Feysot, Christine, Nitschké, Patrick, Munnich, Arnold, Bahi-Buisson, Nadia, Fossoud, Catherine, Giuliano, Fabienne, Colleaux, Laurence, Burglen, Lydie, Gleeson, Joseph G., Boddaert, Nathalie, Saiardi, Adolfo, and Cantagrel, Vincent

Published
2020
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41. Evolutionary perspective on mammalian inorganic polyphosphate (polyP) biology.

Author

Borghi, Filipy and Saiardi, Adolfo

Subjects
*POLYPS, *EUKARYOTES, *BIOLOGY, *ADENOMATOUS polyps
Abstract

Inorganic polyphosphate (polyP), the polymeric form of phosphate, is attracting evergrowing attention due to the many functions it appears to perform within mammalian cells. This essay does not aim to systematically review the copious mammalian polyP literature. Instead, we examined polyP synthesis and functions in various microorganisms and used an evolutionary perspective to theorise key issues of this field and propose solutions. By highlighting the presence of VTC4 in distinct species of very divergent eucaryote clades (Opisthokonta, Viridiplantae, Discoba, and the SAR), we propose that whilst polyP synthesising machinery was present in the ancestral eukaryote, most lineages subsequently lost it during evolution. The analysis of the bacteria-acquired amoeba PPK1 and its unique polyP physiology suggests that eukaryote cells must have developed mechanisms to limit cytosolic polyP accumulation. We reviewed the literature on polyP in the mitochondria from the perspective of its endosymbiotic origin from bacteria, highlighting how mitochondria could possess a polyP physiology reminiscent of their ‘bacterial’ beginning that is not yet investigated. Finally, we emphasised the similarities that the anionic polyP shares with the better-understood negatively charged polymers DNA and RNA, postulating that the nucleus offers an ideal environment where polyP physiology might thrive. [ABSTRACT FROM AUTHOR]

Published
2023
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42. β-lapachone regulates mammalian inositol pyrophosphate levels in an NQO1-and oxygen-dependent manner.

Author

Eisenbeis, Verena B., Danye Qiu, Gorka, Oliver, Strotmann, Lisa, Guizhen Liu, Prucker, Isabel, Su, Xue Bessie, Wilson, Miranda S. C., Ritter, Kevin, Loenarz, Christoph, Groß, Olaf, Saiardi, Adolfo, and Jessen, Henning J.

Subjects
ELECTROSPRAY ionization mass spectrometry, INOSITOL, REACTIVE oxygen species, CAPILLARY electrophoresis, TYPE 2 diabetes
Abstract

Inositol pyrophosphates (PP-InsPs) are energetic signaling molecules with important functions in mammals. As their biosynthesis depends on ATP concentration, PP-InsPs are tightly connected to cellular energy homeostasis. Consequently, an increasing number of studies involve PP-InsPs in metabolic disorders, such as type 2 diabetes, aspects of tumorigenesis, and hyperphosphatemia. Research conducted in yeast suggests that the PP-InsP pathway is activated in response to reactive oxygen species (ROS). However, the precise modulation of PP-InsPs during cellular ROS signaling is unknown. Here, we report how mammalian PP-InsP levels are changing during exposure to exogenous (H2O2) and endogenous ROS. Using capillary electrophoresis electrospray ionization mass spectrometry (CE-ESI-MS), we found that PP-InsP levels decrease upon exposure to oxidative stressors in HCT116 cells. Application of quinone drugs, particularly β-lapachone (β-lap), under normoxic and hypoxic conditions enabled us to produce ROS in cellulo and to show that β-lap treatment caused PP-InsP changes that are oxygen-dependent. Experiments in MDA-MB-231 breast cancer cells deficient of NAD(P)H:quinone oxidoreductase-1 (NQO1) demonstrated that β-lap requires NQO1 bioactivation to regulate the cellular metabolism of PP-InsPs. Critically, significant reductions in cellular ATP concentrations were not directly mirrored in reduced PP-InsP levels as shown in NQO1-deficient MDA-MB-231 cells treated with β-lap. The data presented here unveil unique aspects of β-lap pharmacology and its impact on PP-InsP levels. The identification of different quinone drugs as modulators of PP-InsP synthesis will allow the overall impact on cellular function of such drugs to be better appreciated. [ABSTRACT FROM AUTHOR]

Published
2023
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