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The Journal of Medical Microbiology, Vol 35, Issue 2 65-71, Copyright © 1991 by Society for General Microbiology

JOURNAL ARTICLE

Characterisation and functional aspects of monoclonal antibodies specific for surface proteins of coagulase-negative staphylococci

C. P. Timmerman, J. M. Besnier, L. De Graaf, R. Torensma, A. J. Verkley, A. Fleer and J. Verhoef
GA Eijkman-Winkler Laboratory of Medical Microbiology, University of Utrecht, The Netherlands.

Mouse monoclonal antibodies (MAbs) raised against whole cells of Staphylococcus epidermidis strain 354 were characterised morphologically and functionally. Nine MAbs showed strong reactivity with coagulase-negative staphylococci (CNS). Only two MAbs were specific for CNS; both belonged to the IgG1 subclass, and one, MAb 36.4, reacted only with the strain used for immunisation. In immunoblotting, both CNS-specific MAbs 36.3 and 36.4 reacted strongly with cell-wall protein bands of 220 Kda of S.epidermidis strain 354 and weak reactivity was observed with a 110-Kda band. MAb 36.3 reacted also with 220-230 Kda bands of two other S.epidermidis strains (291 and ATCC 35984) and a 160-180 Kda band of S.epidermidis strain 354. Only MAb 36.4 promoted phagocytosis of strain 354 by polymorphonuclear leucocytes (PMNL) and monocytes, whereas MAb 36.3 and the other MAbs lacked this activity. Opsonisation of S. epidermidis with MAb 36.4 in the presence of complement enhanced uptake by PMNL, but not by monocytes. Furthermore, S.epidermidis strain 354 opsonised with MAb 36.4 induced chemiluminescence of PMNL. Immuno-gold electronmicroscopy with both MAbs 36.3 and 36.4 demonstrated a homogeneous distribution of gold particles on the surface as well as close to the surface of S.epidermidis.


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