Inhibition of apoptosis by normal and aberrant Fli-1 and erg proteins involved in human solid tumors and leukemias

Oncogene
H YiE S Reddy

Abstract

Two ets family members, namely erg and Fli-1 are fused with two EWS family members namely EWS and TLS/FUS as a result of chromosome translocation in human solid tumors and leukemias. EWS-erg and EWS-Fli-1, which are involved in greater than 95% of Ewing family of tumors, were shown to function as transcriptional activators. TLS/FUS-erg, which is involved in human myeloid leukemias also functions as a transcriptional activator. Expression of these fusion proteins (EWS-erg and EWS-Fli-1) are shown to be essential for maintaining the oncogenic and tumorigenic properties of tumor cells. Cancer is thought to be caused not only by uncontrolled cell proliferation but also by deregulation of programmed cell death. Therefore, we have studied the role of normal (Fli-1 and erg) and aberrant fusion proteins (EWS-erg, EWS-Fli-1 and TLS/FUS-erg) in apoptosis. We have found that expression of normal (Fli-1 and erg) and aberrant fusion proteins inhibit the apoptosis of NIH3T3 cells induced by either serum deprivation or by treatment with calcium ionophore. We have also observed similar suppression of apoptosis in Ewing's sarcoma cells expressing EWS-Fli-1 and EWS-erg proteins suggesting that these fusion proteins may be responsible for the dec...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis