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. 1984 Mar;114(3):410–417.

Differential effects of complement activation induced by cobra venom factor on pulmonary transvascular fluid and protein exchange.

A Johnson, F A Blumenstock, M Hussain, A B Malik
PMCID: PMC1900409  PMID: 6696049

Abstract

Sheep were prepared with lung lymph fistulas for assessment of the effects of complement activation on pulmonary transvascular fluid and protein exchange in the intact animal. Cobra venom factor (CVF 200 +/- 46 U/kg) was injected intravenously for activation of the complement system. In some animals (n = 6), pulmonary lymph flow (Qlym) and pulmonary arterial pressure (Ppa) increased without a change in the lymph-to-plasma protein concentration ratio (L/P) or in pulmonary blood flow (QL), indicating an increase in pulmonary vascular permeability to proteins. In another group (n = 6), Qlym and the L/P did not change, and there were also no changes in Ppa and QL following a similar injection of CVF. Morphologic evidence showed that leukocytes were trapped in pulmonary vessels and interstitium of both groups. Pulmonary edema was also present in both groups. Complement activation does not uniformly increase pulmonary lymph flow despite pathologic evidence of leukocyte sequestration and pulmonary edema. The lack of change in lymph flow in some animals may be due to lymphatic insufficiency, or lack of generation of humoral mediators, and/or a decrease in pulmonary capillary pressure.

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Selected References

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