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2014 ; 289
(52
): 36204-19
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Modulation of the mevalonate pathway by akt regulates macrophage survival and
development of pulmonary fibrosis
#MMPMID25378391
Larson-Casey JL
; Murthy S
; Ryan AJ
; Carter AB
J Biol Chem
2014[Dec]; 289
(52
): 36204-19
PMID25378391
show ga
Protein kinase B (Akt) is a key effector of multiple cellular processes,
including cell survival. Akt, a serine/threonine kinase, is known to increase
cell survival by regulation of the intrinsic pathway for apoptosis. In this
study, we found that Akt modulated the mevalonate pathway, which is also linked
to cell survival, by increasing Rho GTPase activation. Akt modulated the pathway
by phosphorylating mevalonate diphosphate decarboxylase (MDD) at Ser(96). This
phosphorylation in macrophages increased activation of Rac1, which enhanced
macrophage survival because mutation of MDD (MDDS96A) induced apoptosis.
Akt-mediated activation in macrophages was specific for Rac1 because Akt did not
increase activity of other Rho GTP-binding proteins. The relationship between Akt
and Rac1 was biologically relevant because Akt(+/-) mice had significantly less
active Rac1 in alveolar macrophages, and macrophages from Akt(+/-) mice had an
increase in active caspase-9 and -3. More importantly, Akt(+/-) mice were
significantly protected from the development of pulmonary fibrosis, suggesting
that macrophage survival is associated with the fibrotic phenotype. These
observations for the first time suggest that Akt plays a critical role in the
development and progression of pulmonary fibrosis by enhancing macrophage
survival via modulation of the mevalonate pathway.