Lactoferrin promotes bone growth

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
Jillian Cornish

Abstract

We have demonstrated bovine or human lactoferrin to be an anabolic factor in skeletal tissue. In vitro, lactoferrin stimulates the proliferation of bone forming cells, osteoblasts, and cartilage cells at physiological concentrations (above 0.1 microg/ml). The magnitude of this effect exceeds that observed in response to other skeletal growth factors such as IGF-1 and TGFbeta. DNA synthesis is also stimulated in a bone organ culture system likely reflecting the proliferation of cells of the osteoblast lineage. Lactoferrin is also a potent osteoblast survival factor. In TUNEL and DNA fragmentation assays, lactoferrin decreased apoptosis, induced by serum withdrawal, by up to 70%. In addition, lactoferrin has powerful effects on bone resorbing cells, osteoclasts, decreasing osteoclast development at concentrations > 1 microg/ml in a murine bone marrow culture system. However, lactoferrin did not alter bone resorption in calvarial organ culture, suggesting that it does not influence mature osteoclast function. In vivo, local injection of lactoferrin in adult mice resulted in increased calvarial bone growth, with significant increases in bone area and dynamic histomorphometric indices of bone formation after only 5 injections. Taken...Continue Reading

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