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A blood coagulation abnormality in rabbits deficient in the sixth component of complement (C6) and its correction by
Insights
The sixth complement component (C6) plays a role in blood coagulation. C6 deficiency in rabbits caused clotting abnormalities, which were corrected by adding purified C6.
Area of Science:
- Immunology
- Hematology
- Biochemistry
Background:
- The role of complement system proteins in hemostasis is not fully understood.
- Genetic deficiencies in complement components can impact physiological processes.
Purpose of the Study:
- To investigate the involvement of the sixth component of complement (C6) in normal blood coagulation.
- To characterize the coagulation defect in C6-deficient rabbits.
Main Methods:
- Studied whole blood clotting time and prothrombin consumption in C6-deficient rabbits.
- Assessed other coagulation parameters (prothrombin time, partial thromboplastin time, etc.).
- Administered purified C6 to deficient blood and observed clotting parameters.
- Monitored C6 hemolytic activity during normal human blood clotting.
Main Results:
- C6-deficient rabbit blood exhibited prolonged whole blood clotting time and decreased prothrombin consumption.
- Other coagulation parameters remained normal in deficient rabbits.
- Addition of purified C6 normalized clotting time and prothrombin consumption.
- Partial consumption of C6 hemolytic activity correlated with prothrombin consumption in normal human blood.
Conclusions:
- Provides evidence for the involvement of C6 in normal blood coagulation.
- C6 deficiency leads to specific coagulation abnormalities.
- C6 is consumed during the coagulation process, suggesting a functional role.
Abstract:
Evidence for the involvement of the sixth component of complement (C6) in normal blood coagulation is provided by the description of a coagulation abnormality in rabbits with a genetic C6 deficiency and by its correction with highly purified preparations of C6. Whole blood clotting time in glass or plastic was prolonged and prothrombin consumption was decreased in blood from the deficient animals. Other parameters of blood coagulation were normal, including prothrombin time, partial thromboplastin time, specific clotting factor activities, platelet factor III function, platelet count, and bleeding time. Clotting time and prothrombin consumption became normal when physiologic amounts of highly purified C6 were added to the deficient blood. Partial consumption of C6 hemolytic activity, with a time course similar to the consumption of prothrombin, was demonstrated during the clotting of normal human blood.