Medication Summary
Several therapies have been approved by the US Food and Drug Administration (FDA) for the treatment of type 1 Gaucher disease. Enzyme replacement therapy (ERT) with glucocerebrosidase purified from human placenta was FDA approved in 1991, followed by approval in 1994 of a recombinant form of the enzyme produced in cultured Chinese hamster ovary (CHO) cells, marketed as imiglucerase (Cerezyme). Worldwide, over 4,000 patients with Gaucher disease have received ERT, which is safe and well tolerated.
In 2010, an alternate form of ERT was approved. This form of recombinant enzyme is produced in cultured human cells and is marketed as velaglucerase alfa (VPRIV).[4, 5] In May 2012, taliglucerase alfa (Elelyso) was the first plant cell–based ERT approved by the FDA; it uses engineered carrot cells.
Approximately 10-15% of patients with Gaucher disease treated with imiglucerase develop antibodies to the enzyme protein, but few develop any significant allergic reactions, which are controlled with premedication with hydrocortisone, antihistamines, or both. All antibodies have immunoglobulin G (IgG), mostly of the IgG1 subclass. A few patients with Gaucher disease have developed antibodies that impair enzyme activity. No antibody production has been reported with velaglucerase alfa.
Oral substrate reduction therapy, using an aminosugar inhibitor of glucosylceramide synthase, has been approved for use in patients with type 1 Gaucher disease in whom ERT is not a therapeutic option because of allergy, hypersensitivity, or poor venous access. Although oral substrate reduction therapy was approved by the FDA in 2003, long-term data regarding efficacy and safety are not yet available.
Enzyme replacement therapy
Class Summary
In most cases, ERT is highly effective in reversing the visceral and hematologic manifestations of type 1 Gaucher disease. Recombinant beta-glucocerebrosidase (imiglucerase [Cerezyme]) has replaced the original tissue-derived product, alglucerase (Ceredase). Alglucerase is an orphan drug and still manufactured by Genzyme Corporation on an extremely limited basis for a few patients unable to tolerate the newer recombinant product. Presymptomatic use is controversial because of the high cost and the extremely variable clinical course.
Imiglucerase (Cerezyme)
A recombinant-derived analog of beta-glucocerebrosidase produced in mammalian cell culture and chemically modified by mannose termination of glycosylated amino acids. Catalyzes hydrolytic cleavage of glucocerebroside (a glycoprotein) to glucose and ceramide within the lysosomes of phagocytic cells in the reticuloendothelial system. Treatment with recombinant enzyme improves anemia and thrombocytopenia, reduces spleen and liver size, and decreases cachexia
Velaglucerase alfa (VPRIV)
Hydrolytic lysosomal glucocerebroside-specific enzyme indicated for long-term enzyme replacement therapy for type 1 Gaucher disease. Improves symptoms associated with the disease, including anemia, thrombocytopenia, increased spleen and liver size, and cachexia.
Taliglucerase alfa (Elelyso)
Taliglucerase is a plant-based recombinant enzyme. It catalyzes the hydrolysis of glucocerebroside to glucose and ceramide, which results in reduced spleen and liver enlargement and increased RBCs and platelets.
Glucosylceramide synthase inhibitors:
Class Summary
These agents inhibit the enzyme glucosylceramide synthase, the initial enzyme in a series of reactions that result in the synthesis of most glycosphingolipids, including glucocerebroside. The goal of treatment is to reduce the rate of glucocerebroside biosynthesis so that the amount is reduced to a level that allows the residual activity of the deficient glucocerebrosidase enzyme to be more effective (substrate reduction therapy).
Miglustat (Zavesca)
Indicated for type 1 Gaucher disease in patients in whom ERT is not a therapeutic option. Reduces GSL production by inhibiting glucosylceramide synthase. Reduces spleen and liver volume and increases hemoglobin and platelet counts.
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