S6 Kinase 1, also known as p70S6K, is an enzyme that plays a crucial role in cell growth and metabolism. It is part of the mTOR signaling pathway, which regulates various cellular processes in response to nutrients, growth factors, and energy status. By phosphorylating the ribosomal protein S6, it promotes protein synthesis and cell proliferation. This kinase is important for muscle development and is implicated in various diseases, including cancer and metabolic disorders. Dysregulation of S6 Kinase 1 can lead to abnormal cell growth, making it a potential target for therapeutic interventions in conditions like diabetes and tumors.