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2017 ; 8
(ä): 682
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Arginase-II Deficiency Extends Lifespan in Mice
#MMPMID28943853
Xiong Y
; Yepuri G
; Montani JP
; Ming XF
; Yang Z
Front Physiol
2017[]; 8
(ä): 682
PMID28943853
show ga
The mitochondrial arginase type II (Arg-II) has been shown to interact with
ribosomal protein S6 kinase 1 (S6K1) and mitochondrial p66(Shc) and to promote
cell senescence, apoptosis and inflammation under pathological conditions.
However, the impact of Arg-II on organismal lifespan is not known. In this study,
we demonstrate a significant lifespan extension in mice with Arg-II gene
deficiency (Arg-II(-/-)) as compared to wild type (WT) control animals. This
effect is more pronounced in the females than in the males. The gender difference
is associated with higher Arg-II expression levels in the females than in the
males in skin and heart at both young and old age. Ablation of Arg-II gene
significantly reduces the aging marker p16(INK4a) levels in these tissues of old
female mice, whereas in the male mice this effect of Arg-II deficiency is weaker.
In line with this observation, age-associated increases in S6K1 signaling and
p66(Shc) levels in heart are significantly attenuated in the female Arg-II(-/-)
mice. In the male mice, only p66(Shc) but not S6K1 signaling is reduced. In
summary, our study demonstrates that Arg-II may play an important role in the
acceleration of aging in mice. Genetic disruption of Arg-II in mouse extends
lifespan predominantly in females, which relates to inhibition of S6K1, p66(Shc),
and p16(INK4a). Thus, Arg-II may represent a promising target to decelerate aging
process and extend lifespan as well as to treat age-related diseases.