The Role of FCH Domain Only 1 (FCHO1) as an Oncogene in Lung Cancer

Akt, or protein kinase B, a serine/threonine protein kinase [4], is activated downstream from phosphatidylinositol 3-kinase (PI3K), by various growth factors, including insulin, insulin-like growth factor-I, and epidermal growth factor [5]. Activated Akt (phospho-Akt, p-Akt) is a strong promoter of cell survival because it antagonizes and inactivates various components of the apoptotic cascade such as proapoptotic Bad, caspase-9, and forkhead transcription factor family members [6,7]. The PI3K/Akt signaling pathway regulates the G1/S cell cycle transition by modulating the transcription of cell cycle proteins and suppressing cell cycle inhibitors [8]. A dysregulated cell cycle is often associated with increased tumorigenesis and accelerated tumor growth [9].