Linked Life Data

2600603

Source:http://linkedlifedata.com/resource/pubmed/id/2600603

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1990-1-30
pubmed:abstractText
Previous investigation has demonstrated that in vivo complement activation can produce acute lung injury. Complement component C5a has been implicated as a key factor in this damage. In addition, C5a is thought to play a central role in mediating polymorphonuclear leukocyte (PMN) function. Studies suggest that administering antibodies to C5a might play a role in attenuating lung injury in animal models of sepsis. To evaluate further the effects of anti-C5a antibodies, we compared the effects of anti-human C5a des-Arg monoclonal (MAb) and polyclonal (PAb) antibodies on PMN functions including chemotaxis, chemiluminescence, and lysosomal release. PMN chemotaxis was assayed in Boyden chambers using 0.5% zymosan-activated serum (ZAS) as a source of C5a and 0.5% normal human serum (NHS) as a control. PMN chemiluminescence was measured by scintillation counting using ZAS as a stimulant and NHS as control. In addition, the lysosomal marker enzyme beta-D-glucuronidase was spectrophotometrically determined to assess lysosomal release. The PMN chemotactic response to ZAS was completely abolished with MAb and PAb anti-C5a antibodies (p less than 0.01). Control antibodies had no effect on ZAS-stimulated chemotaxis. The anti-C5a MAb markedly inhibited PMN chemotaxis at concentrations ranging from 20 to 0.2 microgram/ml, and was approximately 30 times more potent than the PAb. ZAS-stimulated PMN chemiluminescence was markedly decreased in response to monoclonal antibodies to C5a. In contrast, the control antibody did not inhibit ZAS-stimulated PMN chemiluminescence. Anti-C5a antibodies also significantly attenuated the release of the lysosomal enzyme beta-D-glucuronidase from ZAS-stimulated PMN. Anti-C5a antibody treatment did not cause a significant lytic effect when incubated with PMN, as demonstrated by the absence of the cytoplasmic marker lactate dehydrogenase in the supernatant. These studies suggest that in states of complement activation, MAbs and PAbs may decrease PMN functions including chemotaxis, chemiluminescence, and lysosomal enzyme release.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0732-6580
pubmed:author
pubmed:issnType
Print
pubmed:volume
8
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
614-24
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Effects of anti-C5a antibodies on human polymorphonuclear leukocyte function: chemotaxis, chemiluminescence, and lysosomal enzyme release.
pubmed:affiliation
Department of Medicine, Stanford University Medical Center, CA 94305-5236.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't