Response of the Circulatory System to Bradykinin and Related Peptides: A Specific Kinin Assay
The complex response of the mammalian circulatory system to bradykinin and related peptides is made up both of direct actions of the peptides as well as responses of the organism which tend to neutralize the actions of the kinins. The direct vasomotor actions of bradykinin are arteriolar dilation, venular constriction, and increased capillary permeability. These cause the observed sharp fall in blood pressure. Catecholamine release, tachyphylaxis, and increased cardiac output partially neutralize the direct effects, and a very efficient multienzyme kinin metabolizing system rapidly removes bradykinin from the circulation. To study these effects we have used synthetic peptides related in structure to the kinins, in addition to certain drugs. The peptides were synthesized by the solid phase method (Stewart and Young, 1969). An adequate understanding of the factors involved has made it possible to develop a rat blood pressure assay which is specific for each of the known mammalian kinins.
KeywordsRelated Peptide Catecholamine Release Solid Phase Method Arteriolar Dilation Blood Pressure Study
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