Bcl-2

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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 inducing (pro-apoptotic) or inhibiting (anti-apoptotic) apoptosis.[1][2]

Bcl-2 derives its name from B-cell lymphoma 2, as it is the second member of a range of proteins initially described in chromosomal translocations involving chromosomes 14 and 18 in follicular lymphomas. Orthologs[3] (such as Bcl2 in mice) have been identified in numerous mammals for which complete genome data are available.

Like BCL3, BCL5, BCL6, BCL7A, BCL9, and BCL10, it has clinical significance in lymphoma.

Isoforms

The two isoforms of Bcl-2, Isoform 1, also known as 1G5M, and Isoform 2, also known as 1G5O/1GJH, exhibit a similar fold. However, results in the ability of these isoforms to bind to the BAD and BAK proteins, as well as in the structural topology and electrostatic potential of the binding groove, suggest differences in antiapoptotic activity for the two isoforms.[4]

Normal physiological function

BCL-2 is localized to the outer membrane of mitochondria, where it plays an important role in promoting cellular survival and inhibiting the actions of pro-apoptotic proteins. The pro-apoptotic proteins in the BCL-2 family, including Bax and Bak, normally act on the mitochondrial membrane to promote permeabilization and release of cytochrome C and ROS, that are important signals in the apoptosis cascade. These pro-apoptotic proteins are in turn activated by BH3-only proteins, and are inhibited by the function of BCL-2 and its relative BCL-Xl.[5]

There are additional non-canonical roles of BCL-2 that are being explored. BCL-2 is known to regulate mitochondrial dynamics, and is involved in the regulation of mitochondrial fusion and fission. Additionally, in pancreatic beta-cells, BCL-2 and BCL-Xl are known to be involved in controlling metabolic activity and insulin secretion, with inhibition of BCL-2/Xl showing increasing metabolic activity,[6] but also additional ROS production; this suggests it has a protective metabolic effect in conditions of high demand.[7]

Role in disease

See also: Apoptosis implication in disease

Damage to the Bcl-2 gene has been identified as a cause of a number of cancers, including melanoma, breast, prostate, chronic lymphocytic leukemia, and lung cancer, and a possible cause of schizophrenia and autoimmunity. It is also a cause of resistance to cancer treatments.[citation needed]

Cancer

Cancer can be seen as a disturbance in the homeostatic balance between cell growth and cell death. Over-expression of anti-apoptotic genes, and under-expression of pro-apoptotic genes, can result in the lack of cell death that is characteristic of cancer. An example can be seen in lymphomas. The over-expression of the anti-apoptotic Bcl-2 protein in lymphocytes alone does not cause cancer. But simultaneous over-expression of Bcl-2 and the proto-oncogene myc may produce aggressive B-cell malignancies including lymphoma.[8] In follicular lymphoma, a chromosomal translocation commonly occurs between the fourteenth and the eighteenth chromosomes — t(14;18) — which places the Bcl-2 gene from chromosome 18 next to the immunoglobulin heavy chain locus on chromosome 14. This fusion gene is deregulated, leading to the transcription of excessively high levels of Bcl-2.[9] This decreases the propensity of these cells for apoptosis.

Auto-immune diseases

Apoptosis plays an active role in regulating the immune system. When it is functional, it can cause immune unresponsiveness to self-antigens via both central and peripheral tolerance. In the case of defective apoptosis, it may contribute to etiological aspects of autoimmune diseases.[10] The autoimmune disease type 1 diabetes can be caused by defective apoptosis, which leads to aberrant T cell AICD and defective peripheral tolerance. Due to the fact that dendritic cells are the immune system's most important antigen-presenting cells, their activity must be tightly regulated by mechanisms such as apoptosis. Researchers have found that mice containing dendritic cells that are Bim -/-, thus unable to induce effective apoptosis, suffer autoimmune diseases more so than those that have normal dendritic cells.[10] Other studies have shown that dendritic cell lifespan may be partly controlled by a timer dependent on anti-apoptotic Bcl-2.[10]

Other

Apoptosis plays an important role in regulating a variety of diseases. For example, schizophrenia is a psychiatric disorder in which an abnormal ratio of pro- and anti-apoptotic factors may contribute towards pathogenesis.[11] Some evidence suggests that this may result from abnormal expression of Bcl-2 and increased expression of caspase-3.[11]

Diagnostic use

Antibodies to Bcl-2 can be used with immunohistochemistry to identify cells containing the antigen. In healthy tissue, these antibodies react with B-cells in the mantle zone, as well as some T-cells. However, positive cells increase considerably in follicular lymphoma, as well as many other forms of cancer. In some cases, the presence or absence of Bcl-2 staining in biopsies may be significant for the patient's prognosis or likelihood of relapse.[12]

Targeted therapies

Targeted and selective Bcl-2 inhibitors that have been in development or are currently in the clinic include:

Oblimersen

An antisense oligonucleotide drug, oblimersen (G3139), was developed by Genta Incorporated to target Bcl-2. An antisense DNA or RNA strand is non-coding and complementary to the coding strand (which is the template for producing respectively RNA or protein). An antisense drug is a short sequence of RNA that hybridises with and inactivates mRNA, preventing the protein from being formed.

Human lymphoma cell proliferation (with t(14;18) translocation) could be inhibited by antisense RNA targeted at the start codon region of Bcl-2 mRNA. In vitro studies led to the identification of Genasense, which is complementary to the first 6 codons of Bcl-2 mRNA.[13]

These showed successful results in Phase I/II trials for lymphoma. A large Phase III trial was launched in 2004.[14] As of 2016, the drug had not been approved and its developer was out of business.[15]

ABT-737 and navitoclax (ABT-263)

In the mid-2000s, Abbott Laboratories developed a novel inhibitor of Bcl-2, Bcl-xL and Bcl-w, known as ABT-737. This compound is part of a group of BH3 mimetic small molecule inhibitors (SMI) that target these Bcl-2 family proteins, but not A1 or Mcl-1. ABT-737 is superior to previous BCL-2 inhibitors given its higher affinity for Bcl-2, Bcl-xL and Bcl-w. In vitro studies showed that primary cells from patients with B-cell malignancies are sensitive to ABT-737.[16] ABT-737 does not directly induce apoptosis; it enhances the effects of apoptotic signals and causes single-agent-mechanism-based killing of cells in small-cell lung carcinoma and lymphoma lines.[citation needed]

In animal models, it improves survival, causes tumor regression and cures a high percentage of mice.[17] In preclinical studies utilizing patient xenografts, ABT-737 showed efficacy for treating lymphoma and other blood cancers.[18] Because of its unfavorable pharmacologic properties ABT-737 is not appropriate for clinical trials, while its orally bioavailable derivative navitoclax (ABT-263) has similar activity on small cell lung cancer (SCLC) cell lines and has entered clinical trials.[19] While clinical responses with navitoclax were promising, mechanistic dose-limiting thrombocytopoenia was observed in patients under treatment due to Bcl-xL inhibition in platelets.[20][21][22]

Venetoclax (ABT-199)

Due to dose-limiting thrombocytopoenia of navitoclax as a result of Bcl-xL inhibition, Abbvie successfully developed the highly selective inhibitor venetoclax (ABT-199), which inhibits Bcl-2, but not Bcl-xL or Bcl-w.[23] Clinical trials studied the effects of venetoclax, a BH3-mimetic drug designed to block the function of the Bcl-2 protein, on patients with chronic lymphocytic leukemia (CLL).[24][25] Good responses have been reported and thrombocytopoenia was no longer observed.[25][26] A phase 3 trial started in Dec 2015.[27] It was approved by the US FDA in April 2016 as a second-line treatment for CLL associated with 17-p deletion.[28] This was the first FDA approval of a BCL-2 inhibitor.[28] In June 2018, the FDA broadened the approval for anyone with CLL or small lymphocytic lymphoma, with or without 17p deletion, still as a second-line treatment.[29]

Interactions

File:Signal transduction pathways.svg
Overview of signal transduction pathways involved in apoptosis.

Bcl-2 has been shown to interact with:

See also

References

  1. ↑ Tsujimoto Y, Finger LR, Yunis J, Nowell PC, Croce CM (Nov 1984). "Cloning of the chromosome breakpoint of neoplastic B cells with the t(14;18) chromosome translocation". Science. 226 (4678): 1097–9. Bibcode:1984Sci...226.1097T. doi:10.1126/science.6093263. PMID 6093263.
  2. ↑ Cleary ML, Smith SD, Sklar J (Oct 1986). "Cloning and structural analysis of cDNAs for bcl-2 and a hybrid bcl-2/immunoglobulin transcript resulting from the t(14;18) translocation". Cell. 47 (1): 19–28. doi:10.1016/0092-8674(86)90362-4. PMID 2875799.
  3. ↑ "OrthoMaM phylogenetic marker: Bcl-2 coding sequence".
  4. ↑ "Human Bcl2, Isoform 1".
  5. ↑ Hardwick JM, Soane L (2013). "Multiple functions of BCL-2 family proteins". Cold Spring Harb Perspect Biol. 5 (2): a008722. doi:10.1101/cshperspect.a008722. PMC 3552500. PMID 23378584.
  6. ↑ Luciani DS, White SA, Widenmaier SB, Saran VV, Taghizadeh F, Hu X, Allard MF, Johnson JD (2013). "Bcl-2 and Bcl-xL suppress glucose signaling in pancreatic ß-cells". Diabetes. 62 (1): 170–182. doi:10.2337/db11-1464. PMC 3526034. PMID 22933114.
  7. ↑ Aharoni-Simon M, Shumiatcher R, Yeung A, Shih AZ, Dolinsky VW, Doucette CA, Luciani DS (2016). "Bcl-2 Regulates Reactive Oxygen Species Signaling and a Redox-Sensitive Mitochondrial Proton Leak in Mouse Pancreatic ß-Cells". Endocrinology. 157 (6): 2270–2281. doi:10.1210/en.2015-1964. PMID 27070098.
  8. ↑ Otake Y, Soundararajan S, Sengupta TK, Kio EA, Smith JC, Pineda-Roman M, Stuart RK, Spicer EK, Fernandes DJ (Apr 2007). "Overexpression of nucleolin in chronic lymphocytic leukemia cells induces stabilization of bcl2 mRNA". Blood. 109 (7): 3069–75. doi:10.1182/blood-2006-08-043257. PMC 1852223. PMID 17179226.
  9. ↑ Vaux DL, Cory S, Adams JM (Sep 1988). "Bcl-2 gene promotes haemopoietic cell survival and cooperates with c-myc to immortalize pre-B cells". Nature. 335 (6189): 440–2. Bibcode:1988Natur.335..440V. doi:10.1038/335440a0. PMID 3262202.
  10. ↑ 10.0 10.1 10.2 Li A, Ojogho O, Escher A (2006). "Saving death: apoptosis for intervention in transplantation and autoimmunity". Clinical & Developmental Immunology. 13 (2–4): 273–82. doi:10.1080/17402520600834704. PMC 2270759. PMID 17162368.
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