AKT2

AKT2 Full Name

v-akt murine thymoma viral oncogene homolog 2

AKT2 Introduction

AKT2, or v-akt murine thymoma viral oncogene homolog 2, is a serine/threonine kinase belonging to the AKT family, which also includes AKT1 and AKT3. As a central mediator of the PI3K–AKT signaling pathway, AKT2 regulates key processes tied to cell survival, proliferation, glucose metabolism, and stress adaptation. It becomes activated through phosphorylation following PI3K stimulation by growth factors, hormones, or cytokines, enabling it to relay signals from the cell membrane to downstream effectors. AKT2 is widely expressed across human tissues but is particularly important in metabolic organs such as liver, muscle, and adipose tissue, reflecting its prominent role in insulin signaling and metabolic homeostasis.

Figure 1. Proposed mechanisms for AKT1 and AKT2 downstream regulation during breast cancer progression.(Sources: Riggio M, et al.; 2017)

Functionally, AKT2 modulates multiple cellular programs, including the regulation of glucose uptake through its control of GLUT4 translocation, the inhibition of pro-apoptotic proteins, and the promotion of protein synthesis via mTOR activation. It also contributes to cytoskeletal organization, cell motility, and cell cycle progression. Distinct from AKT1 and AKT3, AKT2 shows a strong functional specialization in metabolic pathways, particularly those governing insulin responsiveness and lipid metabolism. Experimental studies show that loss of AKT2 function leads to impaired insulin signaling, reduced glucose uptake, and metabolic dysregulation, whereas its hyperactivation promotes cell survival, increased anabolic activity, and resistance to cellular stress.

Clinically, AKT2 is implicated in a broad range of human diseases. Germline mutations in AKT2 can cause severe insulin resistance syndromes or congenital hyperinsulinemic hypoglycemia, underscoring its central role in metabolic control. In oncology, AKT2 amplification or overactivation is associated with several tumor types, including ovarian, pancreatic, breast, and colorectal cancers, where it drives tumor growth, metastasis, and therapy resistance. The kinase's function in promoting survival and metabolic adaptation makes it a strategic therapeutic target in drug development. Beyond metabolic disease and cancer, dysregulated AKT2 signaling has also been linked to cardiovascular disorders and inflammatory conditions, demonstrating the enzyme's wide-ranging influence on human physiology and disease.

Alternate Names for AKT2

AKT2; v-akt murine thymoma viral oncogene homolog 2; RAC-beta serine/threonine-protein kinase; PKB beta; RAC-PK-beta; protein kinase Akt-2; protein kinase B beta; rac protein kinase beta; murine thymoma viral (v-akt) homolog-2; PKBB; PRKBB; HIHGHH; PKBBETA; RAC-BETA;

• 1. Riggio M, et al.; AKT1 and AKT2 isoforms play distinct roles during breast cancer progression through the regulation of specific downstream proteins. Sci Rep. 2017, 7:44244.