In support of the hypothesis that FAD-induced cell death is mediated by excessive ER stress, PERK−/− MEFs exhibited decreased levels of FAD-induced cell death (P<0.05, Figure 5a), which is correlated with decreased ER stress as shown by reduced levels of both CHOP and GRP78.
The metabolic configuration of β-cells is adapted to favour the complete oxidation of glucose by mitochondria [95] through the suppression of genes involved in the production of lactate (LDHA and the plasma membrane monocarboxylate transporter, SLC16A1/MCT1) [96 99], and the expression at high levels of FAD-GPDH [24,25,100].
Results of an analysis of metabolite profiles before the intervention were consistent with the FAD-LSD1 hypothesis, ie, the dietary intervention enhanced the difference in the level of FAD between the 2 genotypes.
A potentially important difference between the 2 genotypes was in the level of FAD, which after the intervention was higher in genotype 2 than genotype 1. FAD is a redox cofactor associated with several important reactions in metabolism, notably in fatty acid oxidation and glycolysis.
RNA-seq expression levels of the FAD genes in developing seeds were obtained from R. Hovav and J. Wendel (personal communication).
The data we obtained are consistent with the regulatory effect of FAD; when FAD levels are relatively high, there is down-regulation of expression of genes in mitochondrial respiration and enhanced export of citrate from the TCA cycle, which results in elevated concentrations of fatty acids, lysolipids, and steroids.
Surprisingly though, there were much higher levels of Δ6 Fads compared with Elovl5 gene expression in the SBT-E1 cells, suggesting that a different Elovl enzyme may catalyse this reaction in SBT.
Sakha 53 at wider spacing of 25 cm with application of nitrogen fertilization levels of 45 N fad.−1.−1
To test the possible involvement of Nrf2 in the maintenance of the mitochondrial redox homeostasis, we determined the levels of NADH and FAD by their autofluorescence.
