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International Journal of Experimental Pathology logoLink to International Journal of Experimental Pathology
. 1995 Feb;76(1):21–28.

Role of alpha-2-macroglobulin and bacterial elastase in guinea-pig pseudomonal septic shock.

M M Khan 1, Y Shibuya 1, T Kambara 1, T Yamamoto 1
PMCID: PMC1997136  PMID: 7537522

Abstract

An essential role of alpha-2-macroglobulin (alpha 2M) was revealed in the prevention of septic shock induced in guinea-pigs by an elastase producing strain (IFO-3455) of Pseudomonas aeruginosa. When bacterial peritonitis was induced by inoculating fibrin-thrombin clot containing viable bacteria at a dose of 10(9) c.f.u./kg body weight, the guinea-pigs (n = 6) died within 7-8 hours due to septic shock. Prior to the shock, consumption of two-thirds of the circulating alpha 2M was observed. When circulating alpha 2M was depleted 4 hours after the bacterial inoculation, the guinea-pigs immediately developed shock and died within one hour. This shock was prevented either with a specific elastase inhibitor, HONHCOCH(CH2C6H5)CO-Ala-Gly-NH2, zincov (6 microM), or with human alpha 2M. Simultaneous depletion of circulating Hageman factor also prevented shock in the alpha 2M-depleted animals. These results indicate that septic shock was induced through activation of the Hageman factor dependent system by the bacteria-produced elastase which survived alpha 2M in the circulation.

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Selected References

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