Bi-specific T-cell engager explained

Bi-specific T-cell engagers (BiTEs) are a class of artificial bispecific monoclonal antibodies that are investigated for use as anti-cancer drugs. They direct a host's immune system, more specifically the T cells' cytotoxic activity, against cancer cells. BiTE is a registered trademark of Micromet AG (fully owned subsidiary of Amgen Inc).[1]

BiTEs are fusion proteins consisting of two single-chain variable fragments (scFvs) of different antibodies, or amino acid sequences from four different genes, on a single peptide chain of about 55 kilodaltons. One of the scFvs binds to T cells via the CD3 receptor, and the other to a tumor cell via a tumor specific molecule.[2] [3]

Mechanism of action

Like other bispecific antibodies, and unlike ordinary monoclonal antibodies, BiTEs form a link between T cells and tumor cells. This causes T cells to exert cytotoxic activity on tumor cells by producing proteins like perforin and granzymes, independently of the presence of MHC I or co-stimulatory molecules. These proteins enter tumor cells and initiate the cell's apoptosis.[4]

This action mimics physiological processes observed during T cell attacks against tumor cells.

BiTEs in clinical assessment or with clinical approvals

Several BiTEs are currently in preclinical and clinical trials to assess their therapeutic efficacy and safety. [5]

Blinatumomab

See main article: Blinatumomab. Blinatumomab links T cells with CD19 receptors found on the surface of B cells. The Food and Drug Administration (US) and the European Medicines Agency approved this therapy for adults with Philadelphia chromosome-negative relapsed or refractory acute lymphoblastic leukemia.[6]

Glofitamab

See main article: Glofitamab.

It is a bispecific CD20-directed CD3 T-cell engager. It was approved for medical use in Canada in March 2023, in the United States in June 2023, and in the European Union in July 2023.

Mosunetuzumab

See main article: Mosunetuzumab.

Bispecifically binds CD20 and CD3 to engage T-cells. Mosunetuzumab was approved for medical use in the European Union in June 2022.

Solitomab

See main article: Solitomab.

Solitomab links T cells with the EpCAM antigen which is expressed by colon, gastric, prostate, ovarian, lung, and pancreatic cancers.[7] [8]

Tebentafusp

See main article: Tebentafusp.

After clinical trials, in January 2022, the US FDA approved tebentafusp (a BiTE targeting the gp100 peptide) for HLA-A*02:01-positive adult patients with unresectable or metastatic uveal melanoma.[9]

Further research

Utilizing the same technology, melanoma (with MCSP specific BiTEs) and acute myeloid leukemia (with CD33 specific BiTEs) can be targeted.[10], research in this area is active.[10]

Another avenue for novel anti-cancer therapies is re-engineering some of the currently used conventional antibodies like trastuzumab (targeting HER2/neu), cetuximab and panitumumab (both targeting the EGF receptor), using the BiTE approach.[11]

, BiTEs against CD66e and EphA2 are being developed as well.[12]

Further reading

Notes and References

  1. Web site: US Trademark registration no. 3,068,856, serial number 78/040,636.. US Patent and Trademark Office.
  2. Helwick. Caroline. 1 June 2008. Novel BiTE antibody mediates contact between T cells and cancer cells. Oncology NEWS International. 17. 6. 15 August 2008. 16 February 2012. https://web.archive.org/web/20120216072126/http://www.cancernetwork.com/display/article/10165/1165525. dead.
  3. Journal Onkologie. BiTE-Antikörper: Durch Bispezifität T-Lymphozyten gegen Tumorzellen richten. BiTE antibodies: Directing T lymphocytes against tumor cells by bispecifity. 2008. 4. D.. Rüttinger. G.. Zugmaier. D.. Nagorsen. C.. Reinhardt. P. A.. Baeuerle. de.
  4. Web site: BiTE Antibody Platform. Micromet Inc.
  5. Voynov. V. Adam. PJ. 2020. Discovery Strategies to Maximize the Clinical Potential of T-Cell Engaging Antibodies for the Treatment of Solid Tumors. Antibodies . 9. 4. E65–E81. 33217946. 10.3390/antib9040065. 7709135. 227100306. free.
  6. Malard. Florent. Mohty. Mohamad. 4 April 2020. Acute lymphoblastic leukaemia. The Lancet. 395. 10230. 1146–1162. 10.1016/s0140-6736(19)33018-1. 32247396. 214779717. 0140-6736. free.
  7. D. . Volkland . Rau . S. . Mangold . J. . Journal of Immunotherapy . 19609237 . 5 . 452–464 . 32 . Pflanz . R. . Lutterbuese . M. . S. . d'Argouges . Amann . Raum . 2009 . T. . Münz . M. . Kufer . P. . Schlereth . B. . Baeuerle . P. A. . Friedrich . M. . Antitumor Activity of an EpCAM/CD3-bispecific BiTE Antibody During Long-term Treatment of Mice in the Absence of T-cell Anergy and Sustained Cytokine Release . S. . Lorenczewski . Kischel . R. . K. . Brischwein . G. . 10.1097/CJI.0b013e3181a1c097 . 25568468 .
  8. Kebenko. Maxim. Goebeler. Marie-Elisabeth. Wolf. Martin. Hasenburg. Annette. Seggewiss-Bernhardt. Ruth. Ritter. Barbara. Rautenberg. Beate. Atanackovic. Djordje. Kratzer. Andrea. Rottman. James B.. Friedrich. Matthias. 2018. A multicenter phase 1 study of solitomab (MT110, AMG 110), a bispecific EpCAM/CD3 T-cell engager (BiTE®) antibody construct, in patients with refractory solid tumors. Oncoimmunology. 7. 8. e1450710. 10.1080/2162402X.2018.1450710. 2162-4011. 6136859. 30221040.
  9. Web site: FDA approves tebentafusp-tebn for unresectable or metastatic uveal melanoma. Center for Drug Evaluation and. Research. 26 January 2022. FDA.
  10. Characterization in primates of MCSP- and CD33-specific human BiTE antibodies for treatment of Melanoma and AML. Kischel. R. Proc Am Assoc Cancer Res. 99. Abs 2404. 2008. etal. dead. https://web.archive.org/web/20110719061528/http://www.micromet.de/fileadmin/template/main/pdf/download/AACR_2008_MCSP_CD33_BiTE_Poster.pdf. 19 July 2011.
  11. Conversion of cetuximab, panitumumab, trastuzumab and omalizumab into T-cell-engaging BiTE antibodies creates novel drug candidates of high potency. Lutterbuese. R. Proc Am Assoc Cancer Res. 99 . Abs 2402 . 2008 . etal. dead . https://web.archive.org/web/20110719061543/http://www.micromet.de/fileadmin/template/main/pdf/download/AACR_2008_Herceptin_BiTE_Poster.pdf. 19 July 2011.
  12. Baeuerle. PA. Reinhardt. C. Bispecific T-cell engaging antibodies for cancer therapy.. Cancer Research. 69. 12. 4941–4. 2009. 19509221. 10.1158/0008-5472.CAN-09-0547.

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