Increased urinary excretion of angiotensin during anaphylactoid reactions.
Immunoreactive angiotensin I (ANG I) and angiotensin II (ANG II) were measured in human urine, after purification on octadecasilyl-silica cartridges. The total daily excretion of ANG I and II in healthy volunteers was 292.2 +/- 62.5 and 12.2 +/- 2.5 pmol/24 h (mean +/- SEM; n = 14). No differences in the concentrations of ANG I or II were detected between females and males. Although lower levels of ANG I and II were found during the nighttime, no clear-cut circadian rhythm in the excretion of the peptides was found. ANG II was not degraded in acidified urine which shows the effective inhibition of ANG-II-degrading enzymes. Oral provocation tests (OPT) in patients with a history of anaphylactoid reactions (AR) to drugs, foods and food additives were associated with elevated ANG I and II concentrations when symptoms of anaphylaxis occurred. The excretion of ANG I increased by a factor of 7.8 +/- 2.4 and the excretion of ANG II by a factor of 6.1 +/- 1.6 (mean +/- SEM; n = 15). In patients with negative OPT and no clinical symptoms of anaphylaxis, the levels of ANG I and II remained unchanged (n = 26). It is concluded that angiotensin peptides play a role during the events of AR. The peptides may be considered as counteracting factors which stabilize cardiovascular functions.
Department of Dermatology, University Hospital Eppendorf, University of Hamburg, Germany.
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R
Rittweger
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Hermann
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J
Ring
D000293:Adolescent; D000328:Adult; D000368:Aged; D000707:Anaphylaxis / Q000209:etiology / Q000652:urine*; D000803:Angiotensin I / Q000652:urine*; D000804:Angiotensin II / Q000652:urine*; D002648:Child; D002675:Child, Preschool; D004342:Drug Hypersensitivity / Q000150:complications / Q000652:urine; D005260:Female; D005512:Food Hypersensitivity / Q000150:complications / Q000652:urine; D006801:Humans; D008297:Male; D008875:Middle Aged; D012084:Renin-Angiotensin System / Q000502:physiology
D000804:Angiotensin II; D000803:Angiotensin I