Linked Life Data

3629190

Source:http://linkedlifedata.com/resource/pubmed/id/3629190

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1987-9-29
pubmed:abstractText
Jacalin, a D-galactose-specific lectin from jackfruit, interacts with human IgA and one or two other serum proteins. Incubation of jacalin with fresh human serum was shown to result in activation of the complement system. Therefore the mechanism of complement activation by jacalin was studied. Jacalin was extracted from jackfruit seeds (crude preparation) and purified to homogeneity by affinity chromatography on IgA-Sepharose to yield a pure preparation of jacalin. Both crude and pure jacalin were able to activate complement, accompanied by conversion of C3. Consumption of C1, C4 and C-1-inactivator (C-1-In) indicated involvement of the classical pathway. Aggregated IgG (AIgG) caused partial (38%) and jacalin induced complete consumption of C1-In functional activity. It was found upon Ouchterlony analysis that jacalin forms a precipitation line with purified C-1-In. In addition binding of 125I-C-1-In to jacalin-Sepharose was observed, and this binding was inhibitable by either secretory IgA or D-galactose. Next to binding of jacalin to C-1-In, jacalin was also shown to inhibit the functional activity of C-1-In. These results indicate that jacalin induces complement activation by inhibition of C-1-In function and thereby facilitates the activation of precursor C1 in either the absence or presence of low amounts of C1 activators.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0300-9475
pubmed:author
pubmed:issnType
Print
pubmed:volume
26
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
111-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
The IgA-binding lectin jacalin induces complement activation by inhibition of C-1-inactivator function.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't