Summary
Sephadex G 200 chromatography of non-contacted human or bovine plasma reveals one peak of kininogen (LMW kininogen) which serves as substrate for both trypsin and contact kallikrein (= prekallikrein activated by Hageman Factor.)
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2.
Under special conditions (faster flow rate, protection with diisopropyl fluorophosphate and hexadimethrine bromide), a small kininogen fraction of higher molecular weight (HMW) occasionally preceded the LMW substrate. It appeared increased when the plasma was hemolytic whether contacted or not.
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3.
Native human plasma was subjected to DEAE sephadex chromatography using stepwise elution starting with relatively high salt concentration. The second peak called HMW-kininogen emerged together with the abrupt increase in ionic strength and contained 2.2 to 4.8 times less kinin than did the first. Both kininogens yielded kinin with purified contact kallikrein.
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4.
By analytical gel filtration of different HMW-kininogen preparations, molecular weights of about 100,000, 200,000 and 500,000 were estimated.
We conclude that HMW-kininogen is not represented by a distinct, individual molecule. It may be a polymer of the low molecular weight kininogen or an aggregate of it with other plasma constituents.
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Habermann, E., Jahrreiss, R. On the endogenous mechanism of kinin release. Naunyn-Schmiedebergs Arch. Pharmak. 269, 101–111 (1971). https://doi.org/10.1007/BF01422019
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DOI: https://doi.org/10.1007/BF01422019