Cited by 135Complement system in diseasesCoagulation, Bradykinin, Polyphosphates, and AngioedemaBlood Coagulation and Thrombosis Mechanisms

Microvascular effects of anaphylatoxins C3a and C5a.

Björk, J, Hugli, T E, Smedegård, G·1985·The Journal of Immunology

Abstract

The direct microvascular effects of human C3a and C5a were investigated by using hamster cheek pouches prepared for intravital microscopy. Topical application of 10 nM C3a resulted in pronounced microcirculatory alterations, characterized by vasoconstriction, platelet aggregation, and an increase in macromolecular leakage at postcapillary venules, as assessed by extravasation of intravascular fluorescein-labeled dextran (m.w. 150,000). Exposure of the preparation to 500 nM COOH-terminal octapeptide analogs of C3a resulted in a microvascular response almost identical to that of C3a, supporting the view that the active site of this anaphylatoxin resided within the COOH-terminal portion. Changes similar to those caused by C3a were also induced by 20 or 100 nM C5a and, in addition, the higher concentration of C5a caused accumulation of polymorphonuclear leukocytes (PMNL) in small venules and somewhat prolonged vascular leakage from venules exhibiting PMNL accumulation. Histamine was found to partially mediate the vascular leakage induced by C3a and the initial (first 5 min) permeability response to the high concentration of C5a, whereas the subsequent leakage induced by the latter anaphylatoxin was unaffected by mepyramine pretreatment. In neutropenic and mepyramine-treated animals exposed to the high concentration of C5a, a partial reduction of both the early and the subsequent vascular leakage was seen, indicating that accumulated PMNL play a role in the prolonged phase of leakage. The pronounced microvascular alterations induced by low concentrations of C3a and C5a strengthen the view that these anaphylatoxins act as mediators of inflammatory reactions in which the complement system is activated.

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Crossref · 10.4049/jimmunol.134.2.1115

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  • Platelet degranulation releases inflammatory mediators including IL-8/CXCL8, IL-1α, IL-1β, IL-6, and TNF-α, and activates the complement cascade.

    “Platelet degranulation also leads to the release of inflammatory mediators such as interleukin (IL)-8, or CXCL8 (a potent neutrophil chemoattractant), in addition to IL-1α, IL-1β, IL-6, and tumor necrosis factor (TNF)-α, and activates the complement cascade [9, 14].”

    From Immunology of Wound Healing (2018) · cites this paper as [14]

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Authors
Björk, J., Hugli, T. E., & Smedegård, G.
Affiliations
  • Uppsala University (SE)
  • Scripps Clinic (US)
Venue
The Journal of Immunology
Published
1985-02-01
Volume
134
Issue
2
Pages
1115-1119
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1583938359
Cited by
134
References
0
Citations by year
2026: 2 · 2024: 3 · 2023: 1 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 4 · 2018: 2 · 2017: 1 · 2016: 5 · 2015: 3 · 2014: 3 · 2013: 3
FWCI
2.95
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Health Sciences › Medicine › Genetics › Coagulation, Bradykinin, Polyphosphates, and Angioedema
  • Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
Keywords
anaphylatoxins, C3a, C5a, complement system, microcirculation, vasoconstriction, platelet aggregation, vascular leakage, polymorphonuclear leukocytes, histamine, mepyramine, neutropenia, inflammatory mediators, hamster cheek pouch
MeSH terms
Animals, Arterioles, Cheek, Complement C3, Complement C5, Cricetinae, Histamine, Humans, Male, Mesocricetus, Microcirculation, Oligopeptides, Platelet Aggregation, Pyrilamine, Vasoconstriction, Venules, Complement C3a, Complement C5a

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