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Pharma Tech Outlook | Tuesday, May 18, 2021
The latest study will help Inozyme characterize the therapeutic potential of INZ-701 in PXE and other manifestations of ABCC6 Deficiency, which provides hope to patient communities waiting for a viable treatment option.
FREMONT, CA: Inozyme Pharma, a biopharmaceutical firm developing therapeutics for the treatment of abnormal mineralization, publishes preclinical data suggesting its clinical development candidate's utility INZ-701, as a potential treatment for ABCC6 Deficiency. The data, demonstrated at the virtual European Calcified Tissue Society Annual Congress, are the first to show that an enzyme replacement therapy (ERT) increased plasma pyrophosphate levels and reduced calcification in an animal model ABCC6 Deficiency.
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ABCC6 Deficiency is a rare, inherited disease that can present as generalized arterial calcification of infancy (GACI) type 2 in infants and as pseudoxanthoma elasticum (PXE) in children and adults. The abnormal calcification created by low PPi can result in vision loss and life-threatening complications, among other morbidities. There is no approved therapy for ABCC6 Deficiency.
In patients with ABCC6 Deficiency, the fewer levels of PPi that lead to pathological mineralization suggest an overlap between ENPP1 and ABCC6 Deficiencies. This helps the rationale for an enzyme replacement therapy aimed at increasing PPi to treat these genetic disorders. The data show that INZ-701 high plasma PPi levels hindered abnormal calcification in an ABCC6-deficient mouse model, demonstrating its ability to treat patients with PXE, a chronic form of ABCC6 Deficiency with no approved therapeutic choices.
This study was performed in partnership with Thomas Jefferson University. Subcutaneous administration of INZ-701 was initiated in ABCC6-deficient mice when the initiation of ectopic mineralization in this model is found. INZ-701 led to a dose-dependent rise in plasma PPi levels at both two and eight weeks after initiation of treatment, leading to lower levels of soft tissue mineralization. It is interesting to see an ENPP1 enzyme replacement impacting tissue calcification in this PXE animal model. The patients suffering from this disease have no treatment options, and partnering with Inozyme to use the in-house expertise on this disease with their drug discovery efforts is exciting.
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