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Enzyme replacement therapy (ERT) is the standard-of-care treatment of Pompe disease, a lysosomal storage disorder caused by deficiency of acid α-glucosidase (GAA). One limitation of ERT with recombinant human (rh) GAA is antibody formation against GAA. Similarly, in adeno-associated virus (AAV) vector-mediated gene transfer for Pompe disease, development of antibodies against the GAA transgene product and the AAV vector prevents therapeutic efficacy and vector readministration, respectively. Here a nondepleting anti-CD4 monoclonal antibody (mAb) was administrated intravenously prior to administration of an AAV2/9 vector encoding GAA to suppress anti-GAA responses, leading to a substantial reduction of anti-GAA immunoglobulins, including IgG1, IgG2a, IgG2b, IgG2c, and IgG3. Transduction efficiency in liver with a subsequent AAV2/8 vector was massively improved by the administration of anti-CD4 mAb with the initial AAV2/9 vector, indicating a spread of benefit derived from control of the immune response to the first AAV2/9 vector. Anti-CD4 mAb along with AAV2/9-CBhGAApA significantly increased GAA activity in heart and skeletal muscles along with a significant reduction of glycogen accumulation. Taken together, these data demonstrated that the addition of nondepleting anti-CD4 mAb with gene therapy controls humoral immune responses to both vector and transgene, resulting in clear therapeutic benefit in mice with Pompe disease.

Original publication

DOI

10.1089/hum.2014.115

Type

Journal article

Journal

Hum Gene Ther

Publication Date

01/2015

Volume

26

Pages

26 - 35

Keywords

Animals, Antibodies, Antibodies, Monoclonal, Antibodies, Viral, CD4 Antigens, Capsid Proteins, Cell Line, Cross Reactions, Dependovirus, Disease Models, Animal, Enzyme Activation, Female, Gene Expression, Genetic Therapy, Genetic Vectors, Glycogen Storage Disease Type II, Humans, Liver, Male, Mice, Mice, Knockout, Sex Factors, Transduction, Genetic, Transgenes, alpha-Glucosidases