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Blood, 15 December 2006, Vol. 108, No. 13, pp. 4283-4287.
Prepublished online as a Blood First Edition Paper on August 31, 2006; DOI 10.1182/blood-2006-03-007997.
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Submitted March 6, 2006
Accepted July 14, 2006
Continuous in vivo infusion of interferon-gamma (IFN- ) enhances engraftment of syngeneic wild-type cells in Fanca-/- and Fancg-/- mice
Yue Si, Samantha Ciccone, Feng-Chun Yang, Jin Yuan, Daisy Zeng, Shi Chen, Henri van de Vrugt, John Critser, Fre Arwert, Laura S Haneline, and D W Clapp*
Dept. of Microbiol. & Immunol., Wells Ctr. for Ped. Res., Indiana Univ. Sch. of Med.
Dept. of Peds., Wells Ctr. for Ped. Res., Indiana Univ. Sch. of Med.
Dept. of Clinical & Human Genetics, VU Univ. Med. Ctr., Amsterdam, The Netherlands
Dept. of Lab. Pathol., Comp. Med. Ctr., Univ. of Missouri
Dept. of Microbiol. & Immunol., Dept. of Peds., Wells Ctr. for Ped. Res., Indiana Univ. Sch. of Med.
* Corresponding author; email: dclapp{at}iupui.edu.
Fanconi anemia (FA) is a heterogeneous genetic disorder characterized by bone marrow (BM) failure and cancer susceptibility. Identification of the cDNAs of FA complementation types allows the potential of using gene transfer technology to introduce functional cDNAs as transgenes into autologous stem cells and provide a cure for the BM failure in FA patients. However, strategies to enhance the mobilization, transduction, and engraftment of exogenous stem cells are required to optimize efficacy prior to widespread clinical use. Hypersensitivity of Fancc -/- cells to interferon-gamma (IFN- ), a nongenotoxic immune regulatory cytokine, enhances engraftment of syngeneic wild-type (WT) cells in Fancc-/- mice. However, whether this phenotype is of broad relevance in other FA complementation groups is unresolved. Here we show that primitive and mature myeloid progenitors in Fanca-/- and Fancg-/- mice are hypersensitive to IFN- and that in vivo infusion of IFN- at clinically relevant concentrations was sufficient to allow consistent long term engraftment of isogenic WT repopulating stem cells. Given that FANCA, FANCC, and FANCG complementation groups account for over 90% of all FA patients, these data provide evidence that IFN- conditioning may be a useful nongenotoxic strategy for myelopreparation in FA patients.

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