Biosynthesis of tumorigenic HER2 C-terminal fragments by alternative initiation of translation
Open accessAbstract
The overactivation of the HERs, a family of tyrosine kinase receptors, leads to the development of cancer. Although the canonical view contemplates HER receptors restricted to the secretory and endocytic pathways, full-length HER1, HER2 and HER3 have been detected in the nucleoplasm. Furthermore, limited proteolysis of HER4 generates nuclear C-terminal fragments (CTFs). Using cells expressing a panel of deletion and point mutants, here we show that HER2 CTFs are generated by alternative initiation of translation from methionines located near the transmembrane domain of the full-length molecule. In vitro and in vivo, HER2 CTFs are found in the cytoplasm and nucleus. Expression of HER2 CTFs to levels similar to those found in human tumors induces the growth of breast cancer xenografts in nude mice. Tumors dependent on CTFs are sensitive to inhibitors of the kinase activity but do not respond to therapeutic antibodies against HER2. Thus, the kinase domain seems necessary for the activity of HER2 CTFs and the presence of these HER2 fragments could account for the resistance to treatment with antibodies.
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p95-HER2 retains kinase activity.
“This form of HER2 retains kinase activity”
From ERBB Receptors: From Oncogene Discovery to Basic Science to Mechanism-Based Cancer Therapeutics (2014) · cites this paper as Anido et al., 2006
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- Authors
- Anido, J., Scaltriti, M., Bech Serra, J. J., Josefat, B. S., Rojo Todo, F., Baselga, J., & Arribas, J.
- Affiliations
- Vall d'Hebron Institut de Recerca (ES)
- Venue
- The EMBO Journal
- Published
- 2006-06-22
- Volume
- 25
- Issue
- 13
- Pages
- 3234-3244
- ISSN
- 0261-4189 (ISSN-L)
- 1460-2075
- PMC
- PMC1500971
- OpenAlex
- W2021019188
- Cited by
- 231
- References
- 30
- Citations by year
- 2026: 7 · 2025: 5 · 2024: 5 · 2023: 16 · 2022: 6 · 2021: 8 · 2020: 11 · 2019: 7 · 2018: 10 · 2017: 5 · 2016: 9 · 2015: 11 · 2014: 15 · 2013: 14 · 2012: 18
- FWCI
- 7.80
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The EMBO Journal (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Health Sciences › Medicine › Pathology and Forensic Medicine › Cancer Mechanisms and Therapy
- Keywords
- HER2, C-terminal fragment, receptor tyrosine kinase, nuclear localization, breast cancer xenografts, kinase inhibitors, ErbB4, EGF receptor, HER3
- MeSH terms
- Amino Acid Sequence, Animals, Breast Neoplasms, Cell Line, Cell Nucleus, Cell Transformation, Neoplastic, Cytoplasm, Enzyme Activation, Female, Humans, Molecular Sequence Data, Mutation, Phosphorylation, Translations, Protein Structure, Tertiary, Codon, Initiator, Erb-b2 Receptor Tyrosine Kinases
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