INHIBITORY EFFECT OF LACTOFERRIN ON IN VITRO GROWTH OF BABESIA CABALLI

HIROMI IKADAI Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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TETSUYA TANAKA Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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NONA SHIBAHARA Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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HIROKO TANAKA Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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AYA MATSUU Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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NOBORU KUDO Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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KEI-ICHI SHIMAZAKI Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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IKUO IGARASHI Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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TAKASHI OYAMADA Department of Veterinary Parasitology, and Department of Small Animal Medicine, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori, Japan; Dairy Science Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido, Japan; National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan

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Lactoferrin (LF) is an important biologic molecule with many functions, one of which is antimicrobial defense. We evaluated the growth-inhibiting effects of four types of LF (native LF, Fe+3-bound [holo] LF, Fe+3-free [apo] LF, and LF hydrolyzate) on the in vitro growth of Babesia caballi and B. equi. The growth of B. caballi was significantly suppressed in media containing apo LF, but was not inhibited in media containing native LF, holo LF, or LF hydrolyzate. The growth of B. equi was not inhibited by media containing native LF, holo LF, or apo LF. These data indicate that apo LF had the strongest inhibitory effect on B. caballi. This may have been caused by inactivation or inhibition of a growth factor in the culture medium.

Author Notes

Reprints requests: Hiromi Ikadai, Department of Veterinary Parasitology, School of Veterinary Medicine and Animal Sciences, Kitasato University, Towada, Aomori 034-8628, Japan, Telephone: 81-176-23-4371, Fax: 81-176-25-0165, E-mail: ikadai@vmas.kitasato-u.ac.jp
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