Improving MPS I ERT Efficacy through Lectin-Mediated Delivery

DESCRIPTION provided by applicant The long term goal of this project is to develop an improved enzyme replacement therapeutic ERT for MPS I that integrates safety and cost advantages of plant based bioproduction with innovations that enhance ERT delivery and disease correction MPS I encompassing Hurler Hurler Scheie Scheie syndromes the most common MPS disease is caused by genetic deficiencies in the lysosomal enzyme L iduronidase IDUA Current IDUA based ERTs for MPS I patients effectively treat most somatic symptoms but do not correct significant debilitating manifestations of this disease especially those affecting the central nervous system CNS To expand the delivery of corrective IDUA enzyme to critical cells and tissues exhibiting MPS I pathology we have produced fusion proteins that combine IDUA with a galactose galactosamine selective plant lectin This lectin has high affinity for glycoproteins and glycolipids common on mammalian cell surfaces and mediates efficient cellular uptake transcytosis and lysosomal delivery of IDUA In vitro analyses of MPS I patient fibroblasts treated with our IDUA Lectin fusions termed IDUAL demonstrate rapid and efficient correction of cellular disease phenotypes They also indicate that IDUAL utilizes different cell binding and uptake mechanisms compared to current ERT drugs for lysosomal diseases We hypothesize that IDUAL will provide ERT access to a broader array of cell types including cells of the central nervous system that are not treated by current MPS I drugs The goal of this SBIR Phase I feasibility study is to assess the in vivo efficacy of the IDUAL fusion as an ERT in the MPS I mouse model Specific aims for Phase I are to produce IDUAL fusion protein at a scale to support in vivo trials using a transient plant based expression platform suitable for commercial production and to demonstrate biodistribution and initial in vivo efficacy of IDUAL in the MPS I mouse model The in vivo studies will include analyses of cognitive behavior and brain histopathology to assess ERT delivery to the brain and potential for ameliorating CNS pathologies While our IDUAL fusion protein has shown significant in vitro efficacy in MPS I fibroblasts this SBIR represents the first test of in vivo animal efficacy and will provide a critical proof of concept for the lectin carrier and the IDUAL fusion drug candidate Based on successfully meeting the Phase I milestones follow on Phase II research will address key preclinical studies required for filing an IND for this product In anticipation of this long term goal BioStrategies LC has initiated clinical and manufacturing partnerships for the Phase II SBIR to support cGMP like bioproduction scale up with Kentucky BioProcessing LLC and extended in vivo preclinical research with the University of Minnesota Medical School necessary to support IND filing with FDA and follow on clinical trials directed toward delivering this technology to affected MPS I patients PUBLIC HEALTH RELEVANCE The family of human genetic diseases belonging to the group of lysosomal diseases LDs including MPS I Hurlers Syndrome represents some of the most devastating disease afflictions known and the most costly to patients their families and the public health care system Currently available enzyme replacement therapeutics ERTs for several of these diseases although effective for many patients suffers from problems of safety high cost product effectiveness and availability of adequate product supplies to patient populations The new therapeutics innovations developed in this SBIR Phase I Randamp D project would address many of these issues by developing ERTs that are more effectively targeted to diseased cell types and tissues e g the brain and that are safer and cheaper to supply to patient populations by virtue of employing newer plant based production technologies The innovative drug delivery technology developed in this project would further the goal of reducing the cost and suffering to patients with these devastating genetic diseases