In 2017, there are no biologics that are FDA approved for CNS disease, wherein drug action requires transport into the brain across the BBB
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1 The Brain and Biotechnology In 2017, there are no biologics that are FDA approved for CNS disease, wherein drug action requires transport into the brain across the BBB
2 History of biologic drug development for the brain and spinal cord Park. Dis. ICV GDNF ALS SQ BDNF SQ CNTF 1999 stroke IV FGF ICV: intra-cerebro-ventricular CED: convection enhanced diffusion
3 Autoradiography History of biologic of rat brain drug 24 development hours after the for injection the of [ 125 Blasberg et al (1975) I]-BDNF brain into and the spinal lateral ventricle cord (LV) Park. Dis. ICV GDNF ALS SQ BDNF SQ CNTF 1999 stroke IV FGF ICV: intra-cerebro-ventricular CED: convection enhanced Yan et al diffusion (1994)
4 History of biologic drug development for the brain and spinal cord Park. Dis. ICV GDNF ALS SQ BDNF SQ CNTF Park. Dis. CED GDNF 1995 stroke IV FGF-2 ICV: intra-cerebro-ventricular CED: convection enhanced diffusion
5 Brain [GDNF] after 7 days of History of biologic drug convection development enhanced diffusion for the delivery to the primate brain brain and spinal cord Park. Dis. ICV GDNF 2005 ALS SQ BDNF SQ CNTF 1999 Park. Dis. CED GDNF Flow = 0.1 ul/min 1995 stroke IV FGF-2 ICV: intra-cerebro-ventricular CED: convection enhanced diffusion Salvatore et al (2006)
6 History of biologic drug development for the brain and spinal cord Park. Dis. ICV GDNF 2009 stroke IV EPO ALS SQ BDNF SQ CNTF Park. Dis. CED GDNF 1995 stroke IV FGF-2 ICV: intra-cerebro-ventricular CED: convection enhanced diffusion
7 Brain uptake of biologic drugs: CSF as surrogate measure of brain penetration 2017 Press Release Robust CNS Penetration of therapeutic antibody for Parkinson s disease based on finding of CSF/plasma ratio of 0.3% Antibody distribution into CSF reflects transport across the choroid plexus, which forms the blood-csf barrier The blood-csf barrier at the choroid plexus is anatomically distinct from the blood-brain barrier (BBB) at the capillary endothelium of brain tissue The choroid plexus, at the blood-csf barrier, is >100-fold leaky compared to the BBB at the brain capillary endothelium All proteins in plasma leak across the choroid plexus at a rate inversely related to molecular weight The CSF/plasma ratio for all plasma IgGs, none of which cross the BBB, ranges from 0.2 to 0.3%
8 History of biologic drug development for the brain and spinal cord Alzheimer Dis. IV bapineuzumab 2013 Park. Dis. ICV GDNF 2009 stroke IV EPO ALS SQ BDNF SQ CNTF stroke IV FGF Park. Dis. CED GDNF ICV: intra-cerebro-ventricular CED: convection enhanced diffusion
9 BBB dysfunction in antibody trials in Alzheimer s disease: Amyloid-Related Imaging Abnormality (ARIA) Sperling et al (2011) ARIA (%) Aducanumab in humans (Sevigny et al, 2016) 1 mg/kg 3 mg/kg 6 mg/kg mg/kg Aβ plaque reduction FLAIR MRI shows multiple areas of vasogenic brain edema in AD subject on bapineuzumab
10 Past CNS Clinical Trials with Biologics and no BBB Delivery Technology disease drug BBB Result 1 ALS BDNF Not considered Fail 2 stroke FGF-2 BBB said to be disrupted Fail 3 PD GDNF Bypass BBB with CSF Fail 4 PD GDNF Bypass BBB with CED Fail 5 stroke EPO Use CSF as index of BBB 6 AD Bapineuzumab Drug induces BBB disruption Fail Fail
11
12 blood red cell Intra-endothelial volume 0.8 ul/gram GLUT1 abluminal membrane Extra-vascular volume 700 ul/gram GLUT1 luminal membrane brain
13 Endogenous BBB Transporters GLUT1 MCT1 CAT1 LAT1? CTL1 NBT? CNT2 Nutrient Transport: Carrier-Mediated Transport Peptide Transport: Receptor-Mediated Transport
14 Immune-staining of capillaries in brain with an antibody to a BBB peptide receptor
15 Human and primate BBB insulin receptor: Mediates transport of insulin and an insulin receptor antibody Human brain capillaries Immunocytochemistry of Rhesus monkey brain with MAb against human insulin receptor (HIR) Brain scanning in Rhesus monkeys Emulsion auto-radiography of rabbit brain after carotid artery infusion of [ 125 I]-insulin Peptide alone Peptide-HIRMAb
16 IgG Fusion Proteins for Delivery of Protein Therapeutics to the Human Brain + = Chimeric or humanized HIRMAb Recombinant protein IgG fusion protein: a New Biological Entity
17 Human BBB Trojan horse fusion proteins: Re-engineering protein therapeutics for delivery to human brain Lysosomal enzymes: Decoy Receptors: Neurotrophins: Therapeutic antibodies: IDUA IDS ASA SGSH TNFR-II EPO GDNF Anti-Aβ ΜΑb
18 Brain scans in the Rhesus monkey: With and Without Trojan Horse Technology IDUA = α-l-iduronidase; lysosomal enzyme mutated in MPS-I IDUA, a lysosomal enzyme HIRMAb -IDUA Fusion protein [ 125 I]-Bolton-Hunter reagent Brain scan 2 hrs after intravenous injection [ 125 I]-Bolton-Hunter reagent
19 HIRMAb-IDUA fusion protein IDUA enzyme alone
20 First BBB Trojan Horse Clinical Trials (INDs approved 2015) Mucopolysaccharidosis Type I Hurler Syndrome HIRMAb-IDUA fusion protein (AGT-181) IDUA = iduronidase The Mucopolysaccharidoses (MPS), Lysosomal storage disorders Mucopolysaccharidosis Type II Hunter Syndrome HIRMAb-IDS fusion protein (AGT-182) IDS = iduronate 2-sulfatase
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