Abstract:
:Anti-HER2 monoclonal antibodies (mAb) have been shown to reduce tumor size and increase survival in patients with breast cancer, but they are ineffective against brain metastases due to poor brain penetration. In previous studies, we identified a peptide, known as Angiopep-2 (An2), which crosses the blood-brain barrier (BBB) efficiently via receptor-mediated transcytosis, and, when conjugated, endows small molecules and peptides with this property. Extending this strategy to higher molecular weight biologics, we now demonstrate that a conjugate between An2 and an anti-HER2 mAb results in a new chemical entity, ANG4043, which retains in vitro binding affinity for the HER2 receptor and antiproliferative potency against HER2-positive BT-474 breast ductal carcinoma cells. Unlike the native mAb, ANG4043 binds LRP1 clusters and is taken up by LRP1-expressing cells. Measuring brain exposure after intracarotid delivery, we demonstrate that the new An2-mAb conjugate penetrates the BBB with a rate of brain entry (Kin) of 1.6 × 10(-3) mL/g/s. Finally, in mice with intracranially implanted BT-474 xenografts, systemically administered ANG4043 increases survival. Overall, this study demonstrates that the incorporation of An2 to the anti-HER2 mAb confers properties of increased uptake in brain endothelial cells as well as BBB permeability. These characteristics of ANG4043 result in higher exposure levels in BT-474 brain tumors and prolonged survival following systemic treatment. Moreover, the data further validate the An2-drug conjugation strategy as a way to create brain-penetrant biologics for neuro-oncology and other CNS indications.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Regina A,Demeule M,Tripathy S,Lord-Dufour S,Currie JC,Iddir M,Annabi B,Castaigne JP,Lachowicz JEdoi
10.1158/1535-7163.MCT-14-0399subject
Has Abstractpub_date
2015-01-01 00:00:00pages
129-40issue
1eissn
1535-7163issn
1538-8514pii
1535-7163.MCT-14-0399journal_volume
14pub_type
杂志文章abstract::Endocrine therapy is important for management of patients with estrogen receptor (ER)-positive breast cancer; however, positive ER staining does not reliably predict therapy response. We assessed the potential to improve prediction of response to endocrine treatment of a novel test that quantifies functional ER pathwa...
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journal_title:Molecular cancer therapeutics
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:2012-05-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Molecular cancer therapeutics
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