Apoptosis plays a major role in normal organism development, tissue homeostasis, and removal of damaged cells. Disruption of this process has been implicated in a variety of diseases such as cancer (reviewed in 1). Bcl-xL is a member of the Bcl-2 family of proteins that are critical regulators of apoptosis (reviewed in 2 and 3). These can be divided into two classes: those that inhibit apoptosis and those that promote cell death. Bcl-xL is an anti-apoptotic mitochondrial protein related to Bcl-w and the major transcript of the bcl-x gene (4). Its high expression in tumors is correlated with advanced disease and poor prognosis (5). Bcl-xL expression level increases in response to several stimuli such as ionizing radiation and treatment with chemotherapeutic agents (6,7).
Jak-STAT signaling pathway
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