Does Bcl-2 trigger apoptosis?

The BCL-2 family of proteins controls cell death primarily by direct binding interactions that regulate mitochondrial outer membrane permeabilization (MOMP) leading to the irreversible release of intermembrane space proteins, subsequent caspase activation and apoptosis.

Does Bcl-2 promote cell proliferation?

Bcl-2 decreases cell proliferation and promotes accumulation of cells in S phase without affecting the rate of apoptosis in human ovarian carcinoma cells. Gynecol Oncol. 2005 Jun;97(3):796-806. doi: 10.1016/j.

What does Bcl-2 do in cancer?

The equilibrium of pro- versus anti-apoptotic BCL-2 proteins ensures appropriate regulation of programmed cell death during development and maintains organismal health. When unbalanced, the BCL-2 family can act as a barrier to apoptosis and facilitate tumour development and resistance to cancer therapy.

What does Bcl-2 interact with to prevent apoptosis?

BCL2 prevents BAX/BAK oligomerization, which would otherwise lead to the release of several apoptogenic molecules from the mitochondrion. It is also known that BCL2 binds to and inactivates BAX and other pro-apoptotic proteins, thereby inhibiting apoptosis.

Is BCL2 a tumor suppressor?

Bcl-2 is widely believed to be an apoptosis suppressor gene. Overexpression of the protein in cancer cells may block or delay onset of apoptosis, by selecting and maintaining long-living cells and arresting cells in the G0 phase of the cell cycle.

What causes BCL2 overexpression?

The results suggest that gene amplification and translocation are at least equally common mechanisms causing bcl-2 protein overexpression in DLBCL. Bcl-2 protein overexpression as determined by IHC is associated with poor response to chemotherapy and poor survival.

What cancer does Bcl-2 cause?

BCL-2 may also play a role in nonhematologic tumors, and inappropriate expression has been observed in solid tumors such as prostate, breast, and small cell and non-small cell lung cancers. In small cell lung cancer, high BCL-2 expression in >90% of patients has been reported.

What does bcl2 positive mean?

Bcl-6 was positive in 13.6% (6 of 44) of cases (11.1% of mantle cell lymphoma and 40% of diffuse large B-cell lymphoma) and its positivity implies a better disease course. Bcl-2 and Bcl-6 can be used as prognostic marker in NHL.

Is Bax a tumor suppressor gene?

The expression of BAX is upregulated by the tumor suppressor protein p53, and BAX has been shown to be involved in p53-mediated apoptosis. The p53 protein is a transcription factor that, when activated as part of the cell’s response to stress, regulates many downstream target genes, including BAX.