Generation of an esterolytic and kinin-forming kallikrein-α2-macroglobulin complex in human serum by treatment with acetone
Naunyn-Schmiedebergs Archiv für Pharmakologie und experimentelle Pathologie - Tập 294 - Trang 75-84 - 1976
Tóm tắt
Kinin-forming and esterolytic activity in human citrate plasma has been activated by treatment of the plasma with acetone. By far most of the esterolytic activity if not all of it was recovered in an α2-macroglobulin (α2M) kallikrein complex (SI) which was characterized and purified by chromatography. Little if any esterolytic activity was present which could be ascribed to free plasma kallikrein. The α2M-kallikrein complex had kinin-releasing activity though much less than free plasma kallikrein, relative to esterolytic potency. This explains that a considerable fraction of the kinin-forming potential of acetone-activated plasma resides in free plasma kallikrein although it represents only a very small portion of the total kallikrein store. Like free plasma kallikrein the α2M complex releases kinin from LMW-kininogen less efficiently than from HMW, in systems of purified components. In whole plasma, the efficiencies change: whereas plasma kallikrein is rapidly inactivated by endogenous inhibitors, the α2M complex is protected from further inactivation and capable of releasing kinin continuously if slowly, attacking also LMW-kininogen after HMW-kininogen has been consumed by free kallikrein. While the α2M-complex in this respect differs functionally from free plasma kallikrein and explains earlier observations suggesting the presence of two kininogenases, it seems doubtful now that two truly different kininogenases exist in human plasma. The results suggest that acetone predominantly inactivates full inhibitors of kallikrein such as C1INH whereas α2M is somewhat more resistant and (pre-)-kallikrein even more. Depending on the time and temperature of acetone treatment one obtains more or less total kallikrein and varying proportions of free to bound enzyme. It is likely that acetone does not truly trigger an activation of prekallikrein but supports spontaneous activation by slowing down the control of the feedback reinforcement of this activation, by damaging inhibitors.
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