FORMATION OF KININS IN PLASMA
& TISSUES
The
pathway for the formation and metabolism of kinins is shown in Figure 17–4.
Three kinins have been identified in mammals: bradykinin, lysylbradykinin (also known as kallidin), and
methi-onyllysylbradykinin. Each contains bradykinin in its structure.Each
kinin is formed from a kininogen by the action of a dif-ferent enzyme.
Bradykinin is released by plasma kallikrein, lysyl-bradykinin by tissue
kallikrein, and methionyllysylbradykinin by pepsin and pepsin-like enzymes. The
three kinins have been found in plasma and urine. Bradykinin is the predominant
kinin in plasma, whereas lysylbradykinin is the major urinary form.
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