Growth-promoting effects of lactoferrin on L. acidophilus and Bifidobacterium spp

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
W S KimK Shimazaki

Abstract

We investigated the effects of lactoferrin on the growth of L. acidophilus CH-2, Bifidobacterium breve ATCC 15700, B. longum ATCC 15707, B. infantis ATCC 15697, and B. bifidum ATCC 15696. The growth of L. acidophilus was stimulated by bovine holo-lactoferrin but not by apo-lactoferrin. With bifidobacteria, bovine lactoferrin stimulated growth of three strains: B. breve, B. infantis and B. bifidum under certain conditions. Both apoprotein and holoprotein had similar effects. However, B. longum growth was not affected by lactoferrin. Thus, the mechanism of stimulating growth of bifidobacteria may be different from that of L. acidophilus. By far-western blotting using biotinylated lactoferrin and horseradish peroxidase-conjugated streptavidin, lactoferrin-binding proteins were detected in the membrane protein fraction of L. acidophilus, B. bifidum, B. infantis and B. breve. The molecular weights of lactoferrin-binding proteins of L. acidophilus were estimated from SDS-polyacrylamide gel electrophoresis to be 27, 41 and 67 kDa, and those of the three bifidobacterial strains were estimated to be 67-69 kDa. However, no such lactoferrin-binding components were detected in the membrane fraction of B. longum. It is interesting that the ...Continue Reading

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