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CUTTING EDGE |
RI as Target for Immunotherapy of Invasive Candidiasis


*
Immunotherapy Laboratory,
Medarex Europe, and
Genmab, University Medical Center, Utrecht, The Netherlands
Invasive candidiasis represents a life-threatening disease for
immunocompromised patients. This study focused on new immunotherapeutic
approaches for systemic Candida albicans infections in a
human Fc
RI-transgenic mouse model. Fc
RI (CD64) is a potent
immunoactivating receptor on phagocytic and dendritic
cells. In vivo targeting of C. albicans toward
neutrophil-Fc
RI by bispecific Abs and G-CSF effectively protected
Fc
RI-transgenic mice from lethal candidiasis. Nontransgenic mice
were not protected, and treatment with bispecific Ab or G-CSF alone did
not reduce mortality. Furthermore, infected Fc
RI-transgenic mice
developed high titers of anti-C. albicans IgG, and
survival was extended on secondary infection without further treatment.
These findings document the capacity of Fc
RI to initiate potent
anti-C. albicans immunity and support the
development of Fc
RI-directed immunotherapy of invasive fungal
disease.
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