Abstract
Purpose
We evaluated the uptake of angiopep-2 paclitaxel conjugate, ANG1005, into brain and brain metastases of breast cancer in rodents. Most anticancer drugs show poor delivery to brain tumors due to limited transport across the blood-brain barrier (BBB). To overcome this, a 19-amino acid peptide (angiopep-2) was developed that binds to low density lipoprotein receptor-related protein (LRP) receptors at the BBB and has the potential to deliver drugs to brain by receptor-mediated transport.
Methods
The transfer coefficient (Kin) for brain influx was measured by in situ rat brain perfusion. Drug distribution was determined at 30 min after i.v. injection in mice bearing intracerebral MDA-MB-231BR metastases of breast cancer.
Results
The BBB Kin for 125I-ANG1005 uptake (7.3 ± 0.2 × 10-3 mL/s/g) exceeded that for 3H-paclitaxel (8.5 ± 0.5 × 10-5) by 86-fold. Over 70% of 125I-ANG1005 tracer stayed in brain after capillary depletion or vascular washout. Brain 125I-ANG1005 uptake was reduced by unlabeled angiopep-2 vector and by LRP ligands, consistent with receptor transport. In vivo uptake of 125I-ANG1005 into vascularly corrected brain and brain metastases exceeded that of 14C-paclitaxel by 4–54-fold.
Conclusions
The results demonstrate that ANG1005 shows significantly improved delivery to brain and brain metastases of breast cancer compared to free paclitaxel.
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Acknowledgements
This work was supported by grants from the Department of Defense Breast Cancer Program (W81XWH-062-0033), NIH/NINDS (R01 NS052484), and from AngioChem, Inc.
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Thomas, F.C., Taskar, K., Rudraraju, V. et al. Uptake of ANG1005, A Novel Paclitaxel Derivative, Through the Blood-Brain Barrier into Brain and Experimental Brain Metastases of Breast Cancer. Pharm Res 26, 2486–2494 (2009). https://doi.org/10.1007/s11095-009-9964-5
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DOI: https://doi.org/10.1007/s11095-009-9964-5