Production of antibodies against bradykinin

Summary High-titer antibodies against bradykinin were raised in rabbits. 2 different conjugates of bradykinin were used for immunization: bradykinin coupled to human serum albumin via 1,5-difluoro-2,4-dinitrobenzene and bradykinin coupled to edestin via 1-ethyl-3(3-dimethyl-aminopropyl)-carbodiimide. The sensitivity of the radioimmunoassay method is in the range of 1–50 pg of bradykinin. Cross-reaction of anti-bradykinin antisera occurred with kallidin and met-lysbradykinin.     

Production of antibodies against synthetic angiotensin II in various animal species

Zusammenfassung Bei Ratten und Kaninchen, jedoch nicht bei Hunden und Katzen, konnten durch wiederholte Injektion von Angiotensin-II-Amid-Carbodiimid-Proteinkomplex in Freund'schem Adjuvans zirkulierende Antikörper gegen Angiotensin erzeugt werden. Durch diese Immunisierung wurde die pressorische Wirkung von exogenem Angiotensin aufgehoben bzw. abgeschwächt, während die von Noradrenalin oder Vasopressin unbeeinflusst blieb. Der Reningehalt der Nieren von Ratten und Kaninchen wurde durch die Immunisierung nicht verändert.     

Stability of some bradykinin analogues against kininase II (author's transl)]

Some analogues of bradykinin, especially with replacements by other amino acids of phenylalanine in position 8, have been investigated for enzymatic stability against kininase II from rat duodenum microsomes and rat uterus plasma membranes, respectively. As compared with bradykinin, two of the analogues, [8-erythro-beta-phenylserine]- and [8-erythro-alpha-Amino-beta-phenylbutyric acid]-Bradykinin were stable to enzymatic degradation. Therefore, the latter may be used for studies in hormone-receptor interaction.     

Production of antibodies to amanitins as the basis for their radioimmunoassay.

The production of antibodies against amanitins is described. By means of these antibodies, a radioimmunoassay was developed which allows detection of as little as 0.5 ng of amanitins in 1 ml of serum. By this method, the clearance of alpha-amanitin from the blood of poisoned mice was measured.     

Production of monoclonal anti-Schistosoma mansoni antibodies. Preliminary study of their biological activities]

Monoclonal antibodies against Schistosoma mansoni have been produced by fusion of splenic lymphocytes from S. mansoni infected Rats and P3-X63-Ag8 BALB/c cells. In vitro and in vivo studies of the biological activities of these antibodies have led to the identification of IgE antibodies with a high reaginic activity and antibodies which in a complement dependent or eosinophil dependent system were shown to have a marked cytotoxicity for schistosomula in vitro. This methodology seems to open new perspectives for the study of antibody function in immunity against parasites as well as for the isolation of the corresponding target antigens.     

9,10-Dihydroergotamine: Production of antibodies and radioimmunoassay

Summary Antibodies against 9,10-dihydroergotamine (DHE) were produced by immunizing rabbits with a conjugate of 6-nor-6-carboxymethyl-9,10-dihydroergotamine and bovine serum albumin. A highly specific and sensitive radioimmunoassay for DHE has been developed.We are greatly indebted to Dr.T. Fehr for the synthesis of 6-nor-6-carboxymethyl-9,10-dihydroergotamine, and to Dr.E. Schreier for providing us with 9,10-dihydroergotamine-[13-³H]-base of high specific activity.     

Production and characterization of antibodies cross-reactive with major aflatoxins

Antibodies cross-reactive with 4 major aflatoxins were demonstrated three weeks after immunization of rabbits with an immunogen which was prepared by conjugating aflatoxin B3 to bovine serum albumin. Aflatoxin B3 was first converted to its hemisuccinate before conjugation to the protein. Tritiated aflatoxin B1 (AFB1) was used as the marker ligand both for antibody titer determination as well as for analysis of antibody specificity. Competitive RIA revealed that the antibodies have good cross-reactivity with aflatoxins B1, B2, G1, and G2 when tritiated AFB1 was used as the marker ligand. The concentrations causing 50% inhibition of binding of 3H-AFB1 to the antibodies by unlabeled aflatoxins B1, B2, G1, G2 and B3 were found to be 0.25, 3.34, 0.32, 4.0 and 0.53 ng/assay, respectively. The antibodies could be used for simultaneous analysis of aflatoxins B1 and G1, two of the most important toxic metabolites produced by Aspergillus flavus and A. parasiticus.     

Production and characterization of antibodies cross-reactive with major aflatoxins

Antibodies cross-reactive with 4 major aflatoxins were demonstrated three weeks after immunization of rabbits with an immunogen which was prepared by conjugating aflatoxin B₃ to bovine serum albumin. Aflatoxin B₃ was first converted to its hemisuccinate before conjugation to the protein. Tritiated aflatoxin B₁ (AFB₁) was used as the marker ligand both for antibody titer determination as well as for analysis of antibody specificity. Competitive RIA revealed that the antibodies have good cross-reactivity with aflatoxins B₁, B₂, G₁, and G₂ when tritiated AFB₁ was used as the marker ligand. The concentrations causing 50% inhibition of binding of³H-AFB₁ to the antibodies by unlabeled aflatoxins B₁, B₂, G₁, G₂ and B₃ were found to be 0.25, 3.34, 0.32, 4.0 and 0.53 ng/assay, respectively. The antibodies could be used for simultaneous analysis of aflatoxins B₁ and G₁, two of the most important toxic metabolites produced byAspergillus flavus andA. parasiticus.     

Monoclonal antibodies against antigens on breast cancer cells

Summary Of 360 mAb obtained in a cell fusion experiment with the spleen cells of a mouse immunized with a mixture of different human breast carcinoma cells lines, 30 mAb were selected which reacted more strongly with tumor cells than with (noncancerous) fibroblasts. Theses mAb were tested for reactivity with additional types of cancerous and noncancerous tissues. Two mAb showed high tumor selectivity, but the corresponding epitopes on individual tumor cells were heterogeneously expressed. The mAb will be evaluated for in vivo applications.     

Improved synthesis of bradykinin

Zusammenfassung Eine neue Methode zur Entfernung der Schutzgruppe von N^G-Tos-Arg mittels wasserfreier Flußsäure und ihre Anwendung für die Synthese von Bradykinin wird beschrieben.     

Monoclonal antibodies against functionally distinct sites on the delta-endotoxin ofBacillus thuringiensis var.thuringiensis

Summary Monoclonal antibodies against the toxic units ofBacillus thuringiensis delta-endotoxin were raised by the hybridoma technique and detected by an indirect enzyme-linked immunosorbent assay (ELISA). Out of 5 positive clones, I was found to secrete antibodies which inactivate the toxin.     

Monoclonal antibodies against antigens on breast cancer cells

Of 360 mAb obtained in a cell fusion experiment with the spleen cells of a mouse immunized with a mixture of different human breast carcinoma cell lines, 30 mAb were selected which reacted more strongly with tumor cells than with (noncancerous) fibroblasts. These mAb were tested for reactivity with additional types of cancerous and noncancerous tissues. Two mAb showed high tumor selectivity, but the corresponding epitopes on individual tumor cells were heterogeneously expressed. The mAb will be evaluated for in vivo applications.     

Induction of antibodies against pure proteins inXenopus laevis daud

Riassunto TreXenopus laevis Daud., mantenuti a temperatura costante di 25 °C, sono stati immunizzati con una proteina pura ad alto peso molecolare, l'emocianina diViviparus ater Cristofori et Jan. Tutti gli animali hanno rispoto con produzione di anticorpi altamente specifici e mercaptoetanolo sensibili. Si è potuto inoltre confermare che l'anticorpopoiesi inXenopus dipende dalla temperatura alla quale l'animale è tenuto durante il trattamento e che è stimolata dall'azione del cortisone.     

Pharmacological characteristics of bradykinin B

Zusammenfassung Die pharmakologischen Effekte (in vitro undin vivo) eines durch Einwirkung von Schlangengift (Bothrops jararaca) auf Rinderplasma erhaltenen, reinen Bradykinins (B) werden beschrieben.     

Biological properties of synthetic bradykinin

Zusammenfassung Das synthetische Bradykinin H-L-Arg-L-Pro-L-Pro-Gly-L-Phe-L-Ser-L-Pro-L-Phe-L-Arg-OH hat (innerhalb der durch Unterschiede in der Methodik bedingten Fehlerbreite) die gleiche biologische Wirksamkeit wie natürliches, durch Einwirkung von Trypsin oderBothrops jararaca-Gift aus Rinderplasma gewonnenes Bradykinin.     

Production and characterization of antibody against aflatoxin M1

Antibody against aflatoxin M1 was obtained after immunization of rabbits with bovine serum albumin-afla M1 oxime conjugate. The antibody has greatest binding efficiency for afla M1, and was less efficient for afla B1. Cross-reaction of antibody with aflatoxin Q1, aflatoxicol, and aflatoxin B2a was weak. Aflatoxin B2, G1, and G2 and afla B1-guanine adducts showed almost no cross-reaction with the antibody. The sensitivity of the binding assay for aflatoxin M1 detection is in the range of 1-10 ng per assay. Detailed methods for the preparation of the conjugate, production of immune serum, and methods for antibody determination are described.