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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1981 Jul;78(7):4241–4245. doi: 10.1073/pnas.78.7.4241

Production and characterization of monoclonal antibodies to soluble rat lung guanylate cyclase.

H Brandwein, J Lewicki, F Murad
PMCID: PMC319765  PMID: 6117073

Abstract

Four monoclonal antibodies to rat lung soluble guanylate cyclase [GTP pyrophosphate-lyase (cyclizing) EC 4.6.1.2] have been produced by fusing spleen cells from immunized BALB/c mice with SP-2/0 myeloma cells. The antibodies were detected by their ability to bind immobilized guanylate cyclase and by immunoprecipitation of purified enzyme in the presence of second (rabbit anti-mouse) antibody. After subcloning by limiting dilution, hybridomas were injected intraperitoneally into mice to produce ascitic fluid containing 2-5 mg of antibody per ml. The four antibodies obtained had titers of between 1:1580 and 1:3160 but were detectable at dilutions greater than 1:20,000. Soluble guanylate cyclase from several rat tissues were crossreactive with the four monoclonal antibodies, suggesting that the soluble enzyme from different rat tissues is antigenically similar. The antibodies also recognized soluble lung enzyme from rat, beef, and pig, while enzyme from rabbit was not crossreactive and mouse enzyme was recognized by only one of the antibodies. Particulate guanylate cyclase from a number of tissues had only minimal crossreactivity with the antibodies. Immunoprecipitated guanylate cyclase retained catalytic activity, could be activated with sodium nitroprusside, and was inhibited by cystamine. None of the antibodies were inhibitory under the conditions examined. These antibodies will be useful probes for the study of guanylate cyclase regulation and function under a variety of physiological conditions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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