Journal
JOURNAL OF MOLECULAR MEDICINE-JMM
Volume 89, Issue 2, Pages 161-170Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00109-010-0693-3
Keywords
Mitochondrial disorders; Lipoamide dehydrogenase (LAD) deficiency; Enzyme replacement therapy; TAT; E3 mice
Funding
- United Mitochondrial Disease Foundation
- Israel Science Foundation
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Medicine today offers no cure for patients suffering from mitochondrial disorders, such as lipoamide dehydrogenase (LAD; also known as E3) deficiency, and treatment is limited to symptomatic care. LAD is one of the components of the alpha-ketoacid dehydrogenase complexes, which are mitochondria] multienzyme complexes crucial fer the metabolism of carbohydrates and amino acids. Recently, we tested the therapeutic approach for treating mitochondrial disorders whereby the activity of multicomponent complexes in the mitochondria is restored by TAT-mediated enzyme replacement therapy (ERT). The LAD deficiency disease was used before as a proof-of-principle in vitro, in patients' cells, utilizing the TAT-LAD fusion protein. In this report, we present successful TAT-mediated ERT in an in vivo mouse model using E3-deficient mice. We demonstrate the delivery of TAT-LAD into E3-deficient mice tissues and that a single administration of TAT-LAD results in a significant increase in the enzymatic activity of the mitochondria] multienzyme complex pyruvate dehydrogenase complex within the liver, heart and, most importantly, the brain of TAT-LAD-treated E3-deficient mice. We believe that this TAT-mediated ERT approach could change the management of mitochondrial disorders and of other metabolic diseases in modern medicine.
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