A monoclonal antibody recognizing an epitope shared by receptors for growth hormone, prolactin, interleukin 2 and interleukin 6 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-05

AUTHORS

Silvia A. Longhi, Marta E. Miranda, María G. Gobet, Lilia A. Retegui

ABSTRACT

Monoclonal antibody (MAb) termed R7B4 was generated throughout the idiotypic-anti-idiotypic network from mice immunized with human and bovine growth hormones (GH). The Ab was selected on the basis that it did not recognize human GH (hGH) neither insolubilized nor in solution but inhibited 125I-hGH binding to receptors from rat and rabbit liver and from Nb2-cell membranes. Since it inhibited Nb2-cell mitogenesis stimulated by hGH, prolactins or placental lactogens, MAb R7B4 behaved as an antagonist of lactogenic hormones. Furthermore, the Ab impaired proliferative activity of interleukin 2 (IL-2) on Nb2 cells as well as growth of 7TD1 cells, an interleukin 6 (IL-6) dependent hybridoma not expressing GH receptors. Biotin-labeled MAb R7B4 specifically bound to rat liver microsomes, and the Ab was able to recognize Nb2 and 7TD1-cell membranes as shown by flow cytometry experiments. However, MAb binding was not hampered by hGH, indicating that the Ab did not mimic GH binding site to receptors. Immunoblot assays indicated that rat and rabbit liver as well as Nb2-cells membrane antigens recognized by MAb R7B4 were similar to those revealed by a MAb directed to prolactin receptors. In addition, MAb R7B4 was able to detect two bands probably corresponding to the somatogenic receptor in rabbit liver microsomes as well as three different proteins in 7TD1-cells showing molecular weights similar to those of the IL-6 receptor complex. Results suggest that MAb R7B4 is directed to an epitope shared by receptors for lactogenic and somatogenic hormones, IL-2 and IL-6. To our knowledge, these data are the first experimental evidence of the existence of structural similarity between some of the receptors grouped in the cytokine receptor superfamily. More... »

PAGES

235-243

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1006984506267

DOI

http://dx.doi.org/10.1023/a:1006984506267

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/10395088


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