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2016 ; 24
(5
): 716-727
Nephropedia Template TP
gab.com Text
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English Wikipedia
Environment Dictates Dependence on Mitochondrial Complex I for NAD+ and Aspartate
Production and Determines Cancer Cell Sensitivity to Metformin
#MMPMID27746050
Gui DY
; Sullivan LB
; Luengo A
; Hosios AM
; Bush LN
; Gitego N
; Davidson SM
; Freinkman E
; Thomas CJ
; Vander Heiden MG
Cell Metab
2016[Nov]; 24
(5
): 716-727
PMID27746050
show ga
Metformin use is associated with reduced cancer mortality, but how metformin
impacts cancer outcomes is controversial. Although metformin can act on cells
autonomously to inhibit tumor growth, the doses of metformin that inhibit
proliferation in tissue culture are much higher than what has been described
in vivo. Here, we show that the environment drastically alters sensitivity to
metformin and other complex I inhibitors. We find that complex I supports
proliferation by regenerating nicotinamide adenine dinucleotide (NAD)+, and
metformin's anti-proliferative effect is due to loss of NAD+/NADH homeostasis and
inhibition of aspartate biosynthesis. However, complex I is only one of many
inputs that determines the cellular NAD+/NADH ratio, and dependency on complex I
is dictated by the activity of other pathways that affect NAD+ regeneration and
aspartate levels. This suggests that cancer drug sensitivity and resistance are
not intrinsic properties of cancer cells, and demonstrates that the environment
can dictate sensitivity to therapies that impact cell metabolism.