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Hemagglutination
About: Hemagglutination is a research topic. Over the lifetime, 5481 publications have been published within this topic receiving 113822 citations.
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TL;DR: It was shown that the tumor-specific antibodies were not directed against bacterial contaminants or against the unusually high concentrations of fibrin found in many neoplastic tissues.
Abstract: Two methods were used to demonstrate the presence of tumor-specific antigens in adenocarcinomata of the human colon: (a) rabbits were immunized with extracts of pooled colonic carcinomata, and the antitumor antisera thus produced were absorbed with a pooled extract of normal human colon and with human blood components; (b) newborn rabbits were made immunologically tolerant to normal colonic tissue at birth, and were then immunized with pooled tumor material in adult life. Normal and tumor tissues were obtained from the same human donors in order to avoid misinterpretation of results due to individual-specific antigenic differences. The antisera prepared by both methods were tested against normal and tumor antigens by the techniques of agar gel diffusion, immunoelectrophoresis, hemagglutination, PCA, and immunofluorescence. Distinct antibody activity directed against at least two qualitatively tumor-specific antigens, or antigenic determinants, was detected in the antisera prepared by both methods and at least two additional tumor antigens were detected exclusively in antisera prepared by the tolerance technique. Whether these additional antigens were qualitatively different from normal tissue antigens, or merely present in tumor tissue in higher concentrations than in normal tissue has not as yet been determined. Furthermore, it was shown that the tumor-specific antibodies were not directed against bacterial contaminants or against the unusually high concentrations of fibrin found in many neoplastic tissues. It was concluded from these results that the pooled tumor extracts contained tumor-specific antigens not present in normal colonic tissue. Identical tumor-specific antigens were also demonstrated in a number of individual colonic carcinomata obtained from different human donors.
2,216 citations
TL;DR: A description of the procedures currently in use in The Rockefeller Foundation Virus Laboratories, some of which were initially developed elsewhere; of those developed in this laboratory, most aspects have not been previously reported.
Abstract: Preparation of Antigens 561; Preparation of Sera 567; Preparation of Erythrocytes 568; Chemical Reagents 569; Technique of HA and HI Tests 570; HA Titrations 571; HI Tests 572; References 573
During the past few years, the methods for conducting hemagglutination (HA) and hemagglutination-inhibition (HI) tests with arthropod-borne (arbor) viruses have undergone a number of modifications, directed toward simplification and improvement as well as extension of the tests to include a larger number of arbor viruses. Accordingly, it seems desirable at this time to bring together, in one publication rather than in a series of papers, a description of the procedures currently in use in The Rockefeller Foundation Virus Laboratories. Some of the procedures were initially developed elsewhere; of those developed in this laboratory, most aspects have not been previously reported.
It was stated by Hallauer (1946) that he had obtained a hemagglutinating antigen from viscerotropic but not from neurotropic strains of yellow fever.
2,059 citations
1,652 citations
TL;DR: Treatment of sheep erythrocytes with suitable concentrations of tannic acid render them capable of adsorbing certain protein molecules from solution in saline, and small amounts of the antigens can be detected through their power to inhibit hemagglutination of the treated cells.
Abstract: Treatment of sheep erythrocytes with suitable concentrations of tannic acid render them capable of adsorbing certain protein molecules from solution in saline. Red cells which have adsorbed proteins in this way are agglutinated after washing by the homologous antiprotein sera, even by high dilutions. Through hemagglutination sera can be titrated for antibodies against antigens adsorbed on the cells exposed to tannic acid. Furthermore, small amounts of the antigens can be detected through their power to inhibit hemagglutination of the treated cells.
1,209 citations
TL;DR: The intranasal inoculation of volunteers with living partially attenuated strains of influenza A and B viruses offers a new opportunity to determine the protective effect of serum haemagglutin-inhibiting antibody against a strictly homologous virus.
Abstract: The intranasal inoculation of volunteers with living partially attenuated strains of influenza A and B viruses offers a new opportunity to determine the protective effect of serum haemagglutin-inhibiting antibody against a strictly homologous virus, under conditions where the time and dosage of the infective challenge can be controlled, the scoring of proven infections can be more precise and higher rates of infection can be achieved than in most natural epidemics.In 1032 adult volunteers, whose serum HI antibody titre was determined immediately before virus challenge, there was a consistent inverse quantitative relationship between the HI titre and the likelihood of infection. The PD 50 (50% protective dose) of HI antibody was 1/18-1/36, but an unusual finding was that volunteers with no detectable pre-challenge antibody often seem to be less susceptible to infection than those with pre-challenge antibody in low titre.In one group of volunteers challenged with an influenza B strain there was no evidence that pre-challenge antibody titres against viral neuraminidase had any significant protective effect against challenge infection.
866 citations