Linked Life Data

1538121

Source:http://linkedlifedata.com/resource/pubmed/id/1538121

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1992-3-30
pubmed:abstractText
GK1.5 is a rat mAb that recognizes the mouse CD4 Ag. It has been shown to deplete CD4+ cells in vivo and to be immunosuppressive. To evaluate the effect of the C region of this antibody in achieving cell depletion, chimeric antibodies, each having the rat GK1.5 V regions and one of the four mouse IgG C region isotypes, were compared with the native rat antibody. The chimeric antibodies and the native antibody were tested for their ability to mediate in vitro C-dependent cytotoxicity, in vivo cell depletion, and prolongation of allogeneic skin graft survival and suppression of alloantibody production. In vitro C-dependent cytotoxicity assays revealed that rat IgG2b and the chimeric antibodies containing mouse IgG2a, mouse IgG2b, and mouse IgG3 were effective in lysing CD4+ lymphocytes whereas mouse IgG1 was ineffective. In vivo studies of CD4+ cell depletion showed that mouse IgG2a, rat IgG2b, and mouse IgG2b were effective isotypes, mouse IgG1 was less effective, and mouse IgG3 did not deplete CD4+ cells. A correlation was found between the ability of an isotype to deplete CD4+ cells in vivo and its ability to prolong the survival of skin allografts and to suppress alloantibody production. The nondepleting mouse IgG3 was ineffective in these assays. Overall the most effective mouse isotype was IgG2a which was as effective as rat IgG2b. These results indicate 1) that syngeneic isotypes of mAb can cause cell depletion and consequently the prolongation of allograft rejection and suppression of alloantibody production; 2) that not all isotypes are equally effective; and 3) that the ability of a given isotype to deplete cells in vivo does not correlate with its ability to mediate C-dependent lysis in vitro. Our results are consistent with the hypothesis that in vivo depletion of cells is mediated by opsonization and binding through the FcR.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-1767
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
148
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1382-8
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Comparison of GK1.5 and chimeric rat/mouse GK1.5 anti-CD4 antibodies for prolongation of skin allograft survival and suppression of alloantibody production in mice.
pubmed:affiliation
Department of Pathology, Boston University School of Medicine, MA 02118.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.