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Abstract
Sprague-Dawley rats were injected intraperitoneally with an inoculum of living or
killed E. Coli suspended in a solution with or without hemoglobin. Rat mortality rate was directly
proportional to both the number of viable bacteria and the amount of hemoglobin injected,
though sterile hemoglobin was innocuous. Serial bacterial colony counts, white blood
cell counts, and differential stains of the peritoneal fluid revealed that (1) hemoglobin
significantly inhibited the intraperitoneal influx of white cells (especially polymorphonuclear
leukocytes [PMNs]) in response to an intraperitoneal bacterial challenge; (2) hemoglobin
inhibited bacterial clearance from the peritoneal cavity; (3) both the rate of clearance
from and the rate of PMN influx into the peritoneal cavity were inversely proportional
to the hemoglobin concentration; (4) hemoglobin reversed both the process of peritoneal
leukocytosis and the clearance of bacteria from the peritoneal cavity when injected
90 minutes after the bacteria; (5) the suppressive effect of hemoglobin on peritoneal
leukocytosis did not depend on bacterial viability. The results strongly suggest that
hemoglobin interferes with the response of PMNs to chemotactic stimuli normally produced
after bacterial challenge in the peritoneal cavity. Thus the adjuvant effect of hemoglobin
in experimental peritonitis appears to be based on its interference with the influx
of PMNs into the peritoneal cavity in response to bacterial organisms. Thus the organisms
are relieved of the principal antibacterial defense in the peritoneal cavity and are
permitted uncontrolled proliferation.
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Article info
Publication history
Accepted:
April 12,
1977
Footnotes
☆Supported by United States Public Health Service grant No. AM 13083.
☆☆Presented at the Third Tripartite Meeting, Philadelphia, Pa., Sept. 29, 1976.
Identification
Copyright
© 1978 Published by Elsevier Inc.