Is BCL2 antiapoptotic or proapoptotic?

Bcl-2 protectors protect cells against apoptosis. Bcl-2 killers (eg, Bax and Bak) are proapoptotic proteins that actively kill cells. Bcl-2 regulators (widely known as BH3-only proteins) promote cell killing by either interfering with the protectors or activating the killers.

What are BCL2 inhibitors?

A selective inhibitor of the anti-apoptotic protein B-cell lymphoma 2 (Bcl-2), with potential pro-apoptotic and antineoplastic activities. Upon administration, Bcl-2 inhibitor BCL201 binds to and inhibits the activity of Bcl-2. This restores apoptotic processes in tumor cells.

What is the function of BCL2 proteins?

BCL-2 family proteins are the regulators of apoptosis, but also have other functions. This family of interacting partners includes inhibitors and inducers of cell death. Together they regulate and mediate the process by which mitochondria contribute to cell death known as the intrinsic apoptosis pathway.

What does BCL2 do in 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.

What is Bax and Bak?

Bax and Bak are two nuclear-encoded proteins present in higher eukaryotes that are able to pierce the mitochondrial outer membrane to mediate cell death by apoptosis. Thus, organelles recruited by nucleated cells to supply energy can be recruited by Bax and Bak to kill cells.

Does Bcl-2 cause 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.

What does BCL-2 positive mean?

Samples with 50% or more malignant cells expressing BCL2 were defined as BCL2 positive. In all, 69 DLBCL cases were stained with CD10, BCL6 and MUM1 to determine cell of origin subtype by Hans criteria.

Is BCL-2 a tumor suppressor gene?

Apoptosis-Suppressing Oncoprotein Bcl-2 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 does BCL stand for in biology?

Bcl-2 (B-cell lymphoma 2), encoded in humans by the BCL2 gene, is the founding member of the Bcl-2 family of regulator proteins that regulate cell death (apoptosis), by either inhibiting (anti-apoptotic) or inducing (pro-apoptotic) apoptosis. It was the first apoptosis regulator identified in any organism.

What cells are BCL2 positive?

Bcl-2 protein was positive in 36.4% (16 of 44) of cases (62.5% of follicular lymphoma, 16.7% of mantle cell lymphoma and 30% of diffuse large B-cell lymphoma); the positive group implying a bad prognostic effect of the marker in NHL.