Correction of the disease phenotype in canine leukocyte adhesion deficiency using ex vivo hematopoietic stem cell gene therapy

Thomas R. Bauer, Mehreen Hai, Laura M. Tuschong, Tanya H. Burkholder, Yu Chen Gu, Robert A. Sokolic, Cole Ferguson, Cynthia E. Dunbar, Dennis D. Hickstein

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Canine leukocyte adhesion deficiency (CLAD) represents the canine counterpart of the human disease leukocyte adhesion deficiency (LAD). Defects in the leukocyte integrin CD18 adhesion molecule in both CLAD and LAD lead to recurrent, life-threatening bacterial infections. We evaluated ex vivo retroviral-mediated gene therapy in CLAD using 2 nonmyeloablative conditioning regimens - 200 cGy total body irradiation (TBI) or 10 mg/kg busulfan - with or without posttransplantation immunosuppression. In 6 of 11 treated CLAD dogs, therapeutic levels of CD18+ leukocytes were achieved. Conditioning with either TBI or busulfan allowed long-term engraftment, and immunosuppression was not required for efficacy. The percentage of CD18+ leukocytes in the peripheral blood progressively increased over 6 to 8 months after infusion to levels ranging from 1.26% to 8.37% at 1-year follow-up in the 6 dogs. These levels resulted in reversal or moderation of the severe CLAD phenotype. Linear amplification-mediated polymerase chain reaction assays indicated polyclonality of insertion sites. These results describe ex vivo hematopoietic stem cell gene transfer in a disease-specific, large animal model using 2 clinically applicable conditioning regimens, and they provide support for the use of nonmyeloablative conditioning regimens in preclinical protocols of retroviral-mediated gene transfer for nonmalignant hematopoietic diseases such as LAD.

Original languageEnglish
Pages (from-to)3313-3320
Number of pages8
Issue number10
StatePublished - Nov 15 2006
Externally publishedYes


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