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J Bacteriol. 1965 December; 90(6): 1520-1524
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Mouse C-Reactive Protein and Endotoxin-Induced Resistance

^a Department of Microbiology, University of Texas Medical Branch, Galveston, Texas

ABSTRACT

PATTERSON, L. T. (University of Texas, Galveston), AND R. D. HIGGINBOTHAM. Mouse C-reactive protein and endotoxin-induced resistance. J. Bacteriol. 90:1520–1524. 1965.—The relationship between the level of C-reactive protein (CRP) in the sera of mice and resistance to Staphylococcus aureus infection after the injection of Escherichia coli endotoxin was studied. The CRP level was essentially unchanged at 6 hr after endotoxin, and resistance was slightly decreased. At 24 hr after endotoxin, both CRP levels and resistance were increased. Since the increase in the CRP level and resistance appeared to be associated, it was of interest that, when mouse CRP was tested for in vitro reactions with several strains of bacteria, cells of all species of gram-positive bacteria tested (including S. aureus) were agglutinated by CRP. E. coli was not agglutinated under the conditions of the test. It is proposed that mouse CRP is an opsonin, and possibly a lysin, and is involved in nonspecific resistance to infection with S. aureus.

¹ James W. McLaughlin postdoctoral fellow. Present address: Department of Animal Industry and Veterinary Science, University of Arkansas, Fayetteville.

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