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Title: Administration of chitosan-tripolyphosphate-DNA nanoparticles to knockdown glutamate dehydrogenase expression impairs transdeamination and gluconeogenesis in the liver
Author: Gaspar Condori, Juan Carlos
Silva-Marrero, Jonás I.
Fábregas, A. (Anna)
Miñarro Carmona, Montserrat
Ticó Grau, Josep R.
Vázquez Baanante, Ma. Isabel
Metón Teijeiro, Isidoro
Keywords: Farmacologia
Teràpia genètica
Biologia molecular
Gene therapy
Molecular biology
Issue Date: 6-Sep-2018
Publisher: Elsevier B.V.
Abstract: Glutamate dehydrogenase (GDH) plays a major role in amino acid catabolism. To increase the current knowledge of GDH function, we analysed the effect of GDH silencing on liver intermediary metabolism from gilthead sea bream (Sparus aurata). Sequencing of GDH cDNA from S. aurata revealed high homology with its vertebrate orthologues and allowed us to design short hairpin RNAs (shRNAs) to knockdown GDH expression. Following validation of shRNA-dependent downregulation of S. aurata GDH in vitro, chitosan-tripolyphosphate (TPP) nanoparticles complexed with a plasmid encoding a selected shRNA (pCpG-sh2GDH) were produced to address the effect of GDH silencing on S. aurata liver metabolism. Seventy-two hours following intraperitoneal administration of chitosan-TPP-pCpG-sh2GDH, GDH mRNA levels and immunodetectable protein decreased in the liver, leading to reduced GDH activity in both oxidative and reductive reactions to about 53-55 % of control values. GDH silencing decreased glutamate, glutamine and aspartate aminotransferase activity, while increased 2-oxoglutarate content, 2-oxoglutarate dehydrogenase activity and 6-phosphofructo-1-kinase/fructose-1,6-bisphosphatase activity ratio. Our findings show for the first time that GDH silencing reduces transdeamination and gluconeogenesis in the liver, hindering the use of amino acids as gluconeogenic substrates and enabling protein sparing and metabolisation of dietary carbohydrates, which would reduce environmental impact and production costs of aquaculture.
Note: Versió postprint del document publicat a:
It is part of: Journal of Biotechnology, 2018, vol. 286, p. 5-13
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ISSN: 0168-1656
Appears in Collections:Articles publicats en revistes (Bioquímica i Fisiologia)
Articles publicats en revistes (Farmàcia, Tecnologia Farmacèutica i Fisicoquímica)

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