Research Conducted by MedImmune Shows the xB3 Platform Efficiently Delivers Antibodies Across the BBB at Therapeutic Doses xB3 Demonstrated Sustained Systemic PK Properties of the MedImmune Antibody Constructs and Demonstrated a Strong PK/PD Dose Dependent Relationship in a Neuropathic Pain Pre-Clinical Model
Delivery of biologic drugs across the blood-brain barrier is becoming a reality. However, the solutions often involve the assembly of complex multi-specific antibody molecules. Here we utilize a simple 12 amino-acid peptide originating from the melanotransferrin (MTf) protein that has shown improved brain delivery properties. 3D confocal fluorescence microscopic analysis demonstrated brain parenchymal localization of a fluorescently labelled antibody (NIP228) when chemically conjugated to either the MTf peptide or full-length MTf protein. Measurement of plasma kinetics demonstrated the MTf peptide fusions had very similar kinetics to an unmodified NIP228 control antibody, whereas the fusion to MTf protein had significantly reduced plasma exposure most likely due to a higher tissue distribution in the periphery. Brain exposure for the MTf peptide fusions was significantly increased for the duration of the study, exceeding that of the fusions to full length MTf protein. Using a neuropathic pain model, we have demonstrated that fusions to interleukin 1 receptor antagonist (IL-1RA) are able to induce significant and durable analgesia following peripheral administration. These data demonstrate that recombinant and chemically conjugated MTf-based brain delivery vectors can deliver therapeutic levels of drug to the central nervous system.
About Bioasis
Bioasis Technologies, Inc. is a biopharmaceutical company developing xB3, a proprietary platform technology for the delivery of therapeutics across the blood-brain barrier (BBB) and the treatment of CNS disorders in areas of high unmet medical need, including brain cancers and neurodegenerative diseases. The delivery of therapeutics across the BBB represents the final frontier in treating neurological disorders. The in-house development programs at Bioasis are designed to develop symptomatic and disease-modifying treatments for brain-related diseases and disorders. The company maintains headquarters in Richmond, Canada with offices in Guilford, Conn., United States. Bioasis trades on the TSX Venture Exchange under the symbol “BTI” and on the OTCQB under the symbol “BIOAF.” For more information about the company please visit www.bioasis.ca or www.bioasis.us.
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1 Thom G, Tian MM, Hatcher JP, et al., A peptide derived from melanotransferrin delivers a protein-based interleukin 1 receptor antagonist across the BBB and ameliorates neuropathic pain in a preclinical model. Journal of Cerebral Blood Flow and Metabolism.
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Source: Bioasis Technologies, Inc.