Synergic antistaphylococcal properties of lactoferrin and lysozyme

Leitch, E.C. and Willcox, M. D. P. (1998) Synergic antistaphylococcal properties of lactoferrin and lysozyme. Journal of Medical Microbiology, 47(9), pp. 837-842. (doi: 10.1099/00222615-47-9-837) (PMID:9736166)

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Staphylococcus epidermidis colonises a wide range of implanted prosthetic devices, but rarely contact lenses - despite a similarity in material composition. A conceivable explanation for this anomaly is the action of the tear defences, including the constitutive proteins lactoferrin and lysozyme. Therefore this study investigated the effect of lactoferrin, lysozyme and serum on the growth of S. epidermidis isolates in artificial tear fluid. Whether supplemented with serum alone or serum with either apolactoferrin or lysozyme, this medium induced a similar, strain-variable effect. However, simultaneous addition of these proteins induced a greater bactericidal or bacteristatic effect. Of those strains killed by the concerted action of apolactoferrin and lysozyme, the absence of serum led to a further increase in the bactericidal effect, whereas strains displaying bacteriostasis were unaffected by serum. Iron saturation of lactoferrin reversed the antimicrobial synergy of apolactoferrin and lysozyme. These results show synergy between lactoferrin and lysozyme which is dependent on the iron limitation of lactoferrin. As a bactericidal mechanism, this synergy is augmented by serum, but bacteriostasis remains unaffected by serum supplemention. Thus, the combination of lysozyme and lactoferrin may partly explain the low level of contact lens colonisation by S. epidermidis in vivo.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Leitch, Dr Carol
Authors: Leitch, E.C., and Willcox, M. D. P.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Journal of Medical Microbiology
Publisher:Microbiology Society
ISSN (Online):1473-5644

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