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2015 ; 74
(ä): 38-48
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The critical role of Akt in cardiovascular function
#MMPMID26025205
Abeyrathna P
; Su Y
Vascul Pharmacol
2015[Nov]; 74
(ä): 38-48
PMID26025205
show ga
Akt kinase, a member of AGC kinases, is important in many cellular functions
including proliferation, migration, cell growth and metabolism. There are three
known Akt isoforms which play critical and diverse roles in the cardiovascular
system. Akt activity is regulated by its upstream regulatory pathways at
transcriptional and post-translational levels. Beta-catenin/Tcf-4, GLI1 and
Stat-3 are some of few known transcriptional regulators of AKT gene. Threonine
308 and serine 473 are the two critical phosphorylation sites of Akt1.
Translocation of Akt to the cell membrane facilitates PDK1 phosphorylation of the
threonine site. The serine site is phosphorylated by mTORC2. Ack1, Src, PTK6,
TBK1, IKBKE and IKK? are some of the non-canonical pathways which affect the Akt
activity. Protein-protein interactions of Akt to actin and Hsp90 increase the Akt
activity while Akt binding to other proteins such as CTMP and TRB3 reduces the
Akt activity. The action of Akt on its downstream targets determines its function
in cardiovascular processes such as cell survival, growth, proliferation,
angiogenesis, vasorelaxation, and cell metabolism. Akt promotes cell survival via
caspase-9, YAP, Bcl-2, and Bcl-x activities. Inhibition of FoxO proteins by Akt
also increases cell survival by transcriptional mechanisms. Akt stimulates cell
growth and proliferation through mTORC1. Akt also increases VEGF secretion and
mediates eNOS phosphorylation, vasorelaxation and angiogenesis. Akt can increase
cellular metabolism through its downstream targets GSK3 and GLUT4. The
alterations of Akt signaling play an important role in many cardiovascular
pathological processes such as atherosclerosis, cardiac hypertrophy, and vascular
remodeling. Several Akt inhibitors have been developed and tested as anti-tumor
agents. They could be potential novel therapeutics for the cardiovascular
diseases.