Abstract:
:Glucose and glutamine serve as the two primary carbon sources in proliferating cells, and uptake of both nutrients is directed by growth factor signaling. Although either glucose or glutamine can potentially support mitochondrial tricarboxylic acid (TCA) cycle integrity and ATP production, we found that glucose deprivation led to a marked reduction in glutamine uptake and progressive cellular atrophy in multiple mammalian cell types. Despite the continuous presence of growth factor and an abundant supply of extracellular glutamine, interleukin-3 (IL-3)-dependent cells were unable to maintain TCA cycle metabolite pools or receptor-dependent signal transduction when deprived of glucose. This was due at least in part to down-regulation of IL-3 receptor α (IL-3Rα) surface expression in the absence of glucose. Treatment of glucose-starved cells with N-acetylglucosamine (GlcNAc) to maintain hexosamine biosynthesis restored mitochondrial metabolism and cell growth by promoting IL-3-dependent glutamine uptake and metabolism. Thus, glucose metabolism through the hexosamine biosynthetic pathway is required to sustain sufficient growth factor signaling and glutamine uptake to support cell growth and survival.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Wellen KE,Lu C,Mancuso A,Lemons JM,Ryczko M,Dennis JW,Rabinowitz JD,Coller HA,Thompson CBdoi
10.1101/gad.1985910subject
Has Abstractpub_date
2010-12-15 00:00:00pages
2784-99issue
24eissn
0890-9369issn
1549-5477pii
gad.1985910journal_volume
24pub_type
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