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2016 ; 27
(9
): 2810-24
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Inorganic Phosphate Activates the AKT/mTORC1 Pathway and Shortens the Life Span
of an ??Klotho-Deficient Model
#MMPMID26872488
Kawai M
; Kinoshita S
; Ozono K
; Michigami T
J Am Soc Nephrol
2016[Sep]; 27
(9
): 2810-24
PMID26872488
show ga
Inorganic phosphate (Pi) has been implicated in the pathogenesis of accelerated
aging; however, the underlying mechanisms remain elusive. Herein, we demonstrated
in cultured cells and in vivo that increased levels of extracellular Pi activated
the AKT/mammalian target of rapamycin complex 1 (mTORC1) pathway by suppressing
membrane-bound phosphatase and tensin homolog (PTEN) levels in a manner requiring
the sodium-dependent Pi transporter PiT?1. High levels of extracellular Pi also
led to phosphorylation of Ser/Thr clusters in the C?terminal tail of PTEN, which
has been shown to dissociate PTEN from the membrane. Notably, blockade of mTORC1
activity by rapamycin treatment prolonged the life span of hyperphosphatemic
??Klotho-deficient (Kl(-/-)) mice. Dietary correction of hyperphosphatemia or
treatment with rapamycin also rescued the brown adipose tissue dysfunction and
oxidative damage observed in Kl(-/-) mice. Furthermore, rapamycin treatment
partially rescued these effects and extended the life span when Kl(-/-) mice were
maintained on a high-phosphate diet. Finally, rapamycin reduced circulating Pi
levels in Kl(-/-) mice, apparently by decreasing the localization of
sodium-dependent Pi transport protein 2a at the renal brush border membrane.
Therefore, the activation of mTORC1 may create a vicious loop that exacerbates
the retention of Pi, which in turn may enhance oxidative damage and ultimately
shorten the life span of Kl(-/-) mice. These results demonstrate that Pi has
important roles in the aging process, and the blockade of mTORC1 may have
therapeutic potential for premature aging-like symptoms associated with
hyperphosphatemia.