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Transferrin, an iron-binding beta-globulin protein that transports iron to mammalian cells, may contribute to innate immunity to fungal pathogens, primarily by limiting microbial access to iron. We investigated whether unsaturated (apo) canine and bovine transferrin had an inhibitory effect in vitro on Malassezia pachydermatis, an important opportunistic cutaneous yeast pathogen of dogs. M. pachydermatis strains were grown at 32 degrees C in 96-well culture plates using Sabouraud's liquid medium containing canine or bovine apo-transferrin at concentrations ranging from 10.6 to 0.7 mg/ml. Optical densities (OD492) in the treated and control wells were measured and then compared between treatments. Bovine and canine transferrin inhibited (P &lt; 0.01) yeast growth at all concentrations tested after five and six days of incubation; inhibition by 5.3 mg/ml exceeded (P &lt; 0.05) that of 0.7 mg/ml on day six. Unsaturated and saturated bovine transferrin had comparable inhibitory effects on the growth of four strains, indicating that the inhibitory effects of transferrin on M. pachydermatis are not dependent upon iron depletion. These studies suggest that transferrin may contribute to innate immunity to M. pachydermatis in dogs and cattle.

Bovine and canine transferrin inhibit the growth ofMalassezia pachydermatis in vitro