Cyclophilin A is a early stage maker of bovine mastitis.

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Cyclophilin A (CyPA), a member of the peptidyl-prolyl cis-trans isomerase family, is known as a cyclosporin binding-protein. Although CyPA was initially believed to function primarily as an intracellular protein, recent studies have revealed that it can be secreted by cells in response to inflammatory stimuli. Therefore, CyPA may play a role in cardiovascular diseases, viral infections and others. Further, extracellular CyPA has a potent chemotactic effect on leukocytes, monocytes, and lymphocytes through CD147 cell receptor.We investigated the expression of CyPA in bovine mammary gland. CyPA was detected in mammary epithelial cells of mastitis cow stronger than healthy cow. Surprisingly, CyPA in milk was stained in mammary gland alveolus of mastitis cow with inflammation of leukocytes, but not in healthy cow. The content of CyPA in milk was greater in mastitis cow than healthy cow. These data indicate that CyPA in milk may be a marker of mastitis.