Disclosure Statement. Objectives. Novel Therapies for Vascular Access Dysfunction: OptiflowDevice, Gene Therapy, and Sirolimus Wrap 2/29/2012
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1 Novel Therapies for Vascular Access Dysfunction: OptiflowDevice, Gene Therapy, and Sirolimus Wrap Neointimal Hyperplasia Characteristic Lesion of Dialysis Access Dysfunction AVF Timmy Lee, M.D., M.S.P.H., F.A.C.P., F.A.S.N. Assistant Professor of Medicine Division of Nephrology and Hypertension University of Cincinnati Academic Health Center February 26, 2012 AVG Roy-Chaudhury, et al. JASN, 2006 and Lee et al, ACKD, 2009 Disclosure Statement Hemodynamic and Vascular Biology Interactions: A Challenge and an Opportunity Consultant: Proteon Therapuetics Shire Funding: National Institutes of Health (5K23DK ) National Kidney Foundation Franklin McDonald/Fresenius Young Investigator Award AVFand AVG Creation Optimize Upstream Hemodynamics Optimize Downstream Biology AVFand AVG Success Courtesy of Dr. Roy-Chaudhury Objectives Pathology and Pathophysiology of AVF and AVG Dysfunction Novels Therapies Endothelial Cell Implants Elastase Local Gene Delivery Therapy SirolimusWrap Goals of Therapies to Target Downstream Biology Promote Vasodilatation Inhibit Neointimal Hyperplasia 1
2 Types of Drug Delivery Systems to Treat Vascular Access Stenosis Systemic Local Drug Delivery Perivascular ( outside to inside ) Endovascular ( inside to outside ) Endothelial Cell Implants Adventitial Cells Migrate to the Intima Optimizing Downstream Biology: Perivascular Endothelial Cell Implants Rationale behind this approach is that the endothelial cell is not just a lining cell but also a cell that produces a slew of beneficial mediators (NO and prostacyclin) Just need to deliver ECs to a site near the region of stenosis and the beneficial mediators will do the rest! After vascular injury adventitial fibroblasts migrate into intima where they become myofibroblasts or contractile smooth muscle cells Roy-Chaudhury, P. et al, JASN, 2006 Edelman and Nugent J Vasc Res 2003 Principles of Novel Perivascular Local Delivery Therapies Drug targets downstream biology Drug applied directly to adventitia to block adventitial activation of fibroblasts Drug applied locally near or at site of vein-artery (AVF) or vein-graft (AVG) anastomosis Directed at the site of vascular injury with minimal systemic toxicity Gradient of drug concentration (highest at adventitia and lowest at endothelium) OptimizingDownstream Biology: Perivascular Endothelial Cell Implants (Vascugel) in Diabetic Patients AVF Implants Arter y V-HEALTH STUDY (Phase I/II trial) AVG Implants No differences in safety profiles (infection rates) No difference in primary unassisted patency Arter y Received FDA approval for Phase III study in 2011 Conte et al, JVS,
3 Efficacy of Phase II Study of Vascugel Primary Patency Assisted Primary Patency Conte et al, JVS, 2009 OptimizingDownstream Biology: Perivascular Elastase Administration Recombinant elastase Applied to the adventitia Destroys the elastinin the vessel wall (internal elastic lamina) Results in a permanent increase in vessel caliber Phase I/II study ongoing in AVF/AVG Safety Data From Phase 2 Study of Vascugel OptimizingDownstream Biology: Perivascular Elastase Administration Artery Pre-Treatment Artery Post-Treatment Conte et al, JVS, 2009 Elastase Therapy Gene Therapy 3
4 OptimizingDownstream Biology: VEGF-D GENE therapy (Trinam; Ark Therapeutics) Perivascular Delivery of Gene Therapy Biodegradable Collar Completion of Surgical Placement of Collar Injection of VEGF-D VEGF-D adenoviral vectors will deliver VEGF-D to the vessel wall Stimulate the production of nitric oxide and prostacyclin Inhibit venous stenosis at the GVA with minimal systemic toxicity Good safety data from a Phase II study Optimizing downstream biology: VEGF-D GENE therapy (Trinam; Ark Therapeutics) Control without Drug Control with Drug Sirolimus Wrap From Ark Therapeutics Perivascular Delivery of Gene Therapy Efficacy of Sirolimus Biodegradable Collar Placement of Collar on AVG Sirolimus is immunosuppresive with antiinflammatory and anti-proliferative effects Acts on smooth muscle cells Proven utility in suppressing neointimal tissue in stents in coronary artery disease 4
5 Coll-R sleeves are wrapped around graft (Coll-R #1) and vein (Coll-R #2) at graft-vein anastomosis Kaplan Meier Analysis of Primary Unassisted Patency and Secondary Assisted Patency 76% 1 year 38% 2 year 84% 1 year 52% 2 year Paulson W D et al. Nephrol. Dial. Transplant (in press), 2012 Paulson W D et al. Nephrol. Dial. Transplant (in press) 2012 Patient Characteristics and Outcomes Whole Blood Sirolimus Levels Following Implantation Systemic Immunosuppression Low Paulson W D et al. Nephrol. Dial. Transplant (in press), 2012 Paulson W D et al. Nephrol. Dial. Transplant (in press) 2012 Individual Outcomes of COLL-Grafts Future Paradigm for Treatment of Hemodialysis Vascular Access Stenosis Pre-surgery therapies to modify vascular endothelium Prevent Stenosis Therapies at the time of surgery 1. Anti-oxidants (MMP inhibitors) 2. Anti-Inflammatory Mediators (Bardoxolone Methyl) 1. Perivascular locally-delivered therapies 2. Optimizing Hemodynamics Therapies at the time of endovascular intervention Paulson W D et al. Nephrol. Dial. Transplant (in press), Local antiproliferative therapy 2. Drug-eluting stents 5
6 Conclusions Adventitial activation may lead to cellular migration from adventitia to media to intima Perivascular therapies may target adventitial activation and promote vasodilatation and inhibit neointima development Promising perivascular therapies entering phase III trials Target therapies to multiple points where vascular injury occurs 6
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