Antibody

“ Examples might include the findings of the presumptive biomarker identification with the addition of a positive PCR, ELISA, or electrochemiluminescence (ECL) results, using specific target nucleic acid sequences for the organism and antibody recognition of agent-specific antigen sites, respectively. ”

“ The most important antibody of this latter type is Hæmolysin, a substance that makes its appearance in the blood serum of an animal previously injected with washed blood cells from an animal of a different species. The serum from such an animal possesses the power of disintegrating red blood discs of the variety employed as antigen and causing the discharge of their contained hæmoglobin, and is specific in its action to the extent of failing to exert any injurious effect upon the red blood cells of any other species of animal. ”

“ In some cases, clear induction of antibodies with activity in impairing parasite growth in a standardized growth inhibitory assay has been achieved [47] but that has not been associated with significant vaccine efficacy. A telling comparator may be that strong adjuvants have generally induced antibody levels comparable to those seen in semi-immune adults living in endemic areas. Such adults have significant protective immunity from natural exposure because they have antibody responses to very large numbers of antigens not just one or two as in vaccinees. ”

“ Previously, these residues have been implicated in regulating norovirus VLP-carbohydrate ligand binding interactions [8] , [36] , [33] . The identification of Epitope D as a human antibody blockade epitope that changes over time provides direct support for our previous hypothesis that escape from protective herd immunity may drive changes in carbohydrate ligand binding affinities over time and potential retargeting of virus infection in different human populations [8] , [31] . ”

“ These data absolutely underscore the critical importance of determining the structures of several of these human mAbs with their appropriate GII.4 VLP epitopes by either cryoEM or crystallography, for informing targeted mutagenesis to identify the role of key residues in regulating antigenicity and antibody escape. ”

“ Infected cells commonly seen in the lung of fetuses that develop a high titer of antibody for PPV probably represent this stage of replication (see Fig. 17.8C) . Affected cells subsequently round up, become pyknotic, and disintegrate with release of virus and viral antigen (Fig. 17.2B) . Other cells in the culture that are not at the appropriate stage to support viral replication continue to phagocytize and accumulate viral antigen in their cytoplasm (Fig. 17.2C) . ”

“ It has been found that immunity from disease may be acquired by young animals being suckled by a female which had previously become immune, the antibody to the disease being absorbed in the ingested milk. ”

“ If hunters from the city do track us to our drinking places, I'll know how to get more weapons!"
"Yes," agreed Calhoun, and added, "Murgatroyd made the antibodies that cured you. As a general rule, you can expect antibody production in your own bodies once an infection begins to be licked. In case of extreme emergency, each of you can probably supply antibodies for a fair number of other plague-victims. You might try serum from blisters you produce on your skin. Quite often antibodies turn up there. ”

“ Guinea-pigs' serum is that most frequently employed for experimental work.
Hæmolysin (immune body, copula, sensitising body, amboceptor) is a thermostable antibody formed in response to the injection of red cells which although in itself inert is capable of linking up complement present in the normal serum to the red cells of the variety used as antigen—a combination resulting in hæmolysis.
Hæmolysin is obtained by collecting fresh blood serum from a suitably inoculated animal and exposing it to a temperature of 56° C. (to destroy the thermo-labile complement) for 15 to 30 minutes before use. ”

“ These amino acids tend to cluster on loops and ridges of the P2 subdomain where antibody interaction would be most accessible. Beyond bioinformatics predictions, only a few studies have shown empirical evidence mapping GII.4 antigenic change. Allen et al. [32] compared the reactivity of five monoclonal antibodies against a pre and post-2002 epidemic GII.4 strain, and identified conformational epitopes composed of residues 294–296 and 393–395. The carbohydrate blockade potential of these antibodies was not reported, so the role of these sites in escape from herd immunity was unclear. ”

“ Body cells die, too, and have to be disposed of; what would happen if removing those dead cells provoked an antibody reaction, as the destruction of foreign cells does? We'd die of anaphylactic shock while we were still infants. ”

“ The membranes were blocked with 2.5% bovine serum albumin and incubated with anti-phosphorylated MRLC (Thr-18/Ser-19) or anti-MLC2 antibody to evaluate phosphorylated or whole MRLC, respectively, followed by incubation with HRP-conjugated anti-rabbit IgG secondary antibodies. Epitopes on proteins specifically recognized by the antibody were visualized using the ECL Advance kit (GE Healthcare UK Ltd., Buckinghamshire, England) . Band intensities were quantified using NIH Image-J software (Bethesda, MD, USA) . Samples were analyzed in triplicate, and representative data are shown in figures. ”

“ Sigmoidal curves were fit to the mean percent control binding calculated by comparing the amount of VLP bound to PGM in the presence of antibody pretreatment to the amount of VLP bound in the absence of antibody pretreatment. Error bars represent the standard error of the mean. Panel B: Mean EC50 for blockade of each blocked VLP. * indicates VLPs with significantly different EC50 compared GII.4.2006.Summary of exchange mutant VLPs containing blockade Epitopes A and D and the reactivity pattern of the human mAbs that recognize these epitopes. ”

“ I suppose you're cleaning up some things on the synthesis of antibodies."
"Yes, I t'ink I can bring immunity reactions under the mass action law. But you are not to help me. You are to do your own work. What do you want to do? This is not a clinic; wit' patients going through so neat in a row!"
"I want to find a hemolysin for which there's an antibody. There isn't any for streptolysin. I'd like to work with staphylolysin. Would you mind?"
"I do not care what you do—if you just do not steal my staph cultures out of the ice-box, and if you will look mysterious all the time, so Dr. ”

“ Its effect is clear but modest.
hen regard to getting early intervention, monoclonal antibodies, both from Lilly and from Regeneron, have received emergency use authorization. Here again, the earlier one uses these, the better. These are as efficient and more efficient in those individuals who don’t necessarily have a good antibody response. ”

“ The process by which passive immunity is acquired depends upon the fact that as a result of the reaction between the specific virus of a particular disease (the antigen) and the tissues of the animal attacked, certain substances—antibodies—are produced, which when transferred to the body of a susceptible animal protect it against that disease. The most important of these antibodies are the antitoxins. From the study of the processes by which immunity is secured against the effects of bacterial action the serum and vaccine methods of treating certain infective diseases have been evolved. ”

“ The immune system produces antibodies as a defense to foreign agents called antigens. When a particular antigen—a virus, for example—enters the body, the immune system generates antibodies to attack it. In a successful attack, the antibodies target and bind to the antigen, stopping it from causing harm to the body. ”

“ By immunity is meant non-susceptibility to a given disease, or to experimental inoculation with a given bacterium or toxin. The term must be used in a relative sense, and account must always be taken of the conditions present. Immunity.An animal may be readily susceptible to a disease on experimental inoculation, and yet rarely or never suffer from it naturally, because the necessary conditions of infection are not supplied in nature. That an animal possesses natural immunity can only be shown on exposing it to such conditions, this being usually most satisfactorily done in direct experiment. ”

“ In passive immunity the blood serum of an actively immunized animal is introduced into a second animal, which thereupon becomes immune, though its cells are not concerned in the process. The animal is passive, just as a test-tube, in which a reaction takes place, plays no other part than that of a passive container for the reagents.
In active immunity the organism may be introduced in what is to be considered a natural manner, as when an animal becomes infected, has a disease, without human interference. Or the organism may be purposely introduced to bring about the immunity. ”

“ But in certain directions, notably in regard to the relations with micro-organisms, changes in the blood-plasma can be made out, though they are not associated in all cases with changes in the formed elements which float in it, nor with any obvious microscopical or chemical alterations.
The phenomena of immunity to the attacks of bacteria or their toxins, of agglutinative action, of opsonic action, of the precipitin tests, and of haemolysis, are all largely dependent on the inherent or acquired characters of the blood serum. It is a commonplace thatImmunity. ”

“ The increased ingestion of bacteria in active immunity would seem to depend upon the presence of immune opsonins in the serum. These, as already explained, are true anti-substances. Thus the apparent increased activity of the leucocytes is due to a preliminary effect of the opsonins on the bacteria. We have no distinct proof that there occurs in active immunity any education of the phagocytes, in Metchnikoff’s sense, that is, any increase of the inherent ingestive or digestive activity of these cells. ”

“ In such cases the immunity is, to speak generally, specific, i.e. applies only to the bacterium or toxin used in its production. A certain degree of non-specific immunity or increased tissue resistance may be produced locally, e.g. in the peritoneum, by injections of non-pathogenic organisms, peptone, nucleic acid and various other substances. In these cases the immunity is without specific character, and cannot be transferred to another animal. Lastly, in a few instances one organism has an antagonistic action to another ”

“ Individuals vary just as much in susceptibility and hence in reactive power, and generally speaking, an individual will react better in the production of antibodies to a stimulus to which he has been more or less subjected, i.e., to organisms derived from his own body.
In the preparation of a vaccine great care must be used in heating so that the organisms are killed, but the antigens are not destroyed. Many of the enzymes present in bacteria, especially the proteolytic ones, are not any more sensitive to heat than are the antigens, hence are not destroyed entirely. ”

“ Ways of detecting adulteration in foods, particularly foods from animal sources, and of differentiating proteins of varied origin, as well as means of establishing biological relationships and differences among groups of animals through “immunity reactions” of blood serums have followed from knowledge gained by application of the facts or the methods of immunity research. Hence the study of “immunity problems” has come to include much more than merely the study of those factors which prevent the development of disease in an animal or result in its spontaneous recovery. ”

“ Just as they had a built-in unit in their digestive tract to cause the instant rejection of unwholesome food, their body-cells had a built-in ability to produce antibodies immediately the toxin of a pathogenic organism came into contact with them. So tormals were effectively safe against any disease transmitted by ordinary methods of infection. Yet if a culture of pathogenic bacteria—say—were injected into their blood stream, their whole body set to work to turn out antibodies because all their body was attacked. ”

“ The question of the value of preventive inoculation is, however, still an open one. So also are other applications of the principles of immunity, as the production of anti-sera for snake-venom, and for the irritant (and perhaps intoxicating) vegetable agent causing hay fever.
I have earlier in this lecture referred to methods of serum diagnosis depending on agglutination or solution of bacteria or on the precipitation of protein. Immunology has recently contributed to medicine another diagnostic method of great value. ”

“ All immunological studies are based on the known fact of the reinforcement of natural resistance to disease, as illustrated by serum therapy in diphtheria and by vaccine therapy in anthrax. The attempts to elucidate the principles underlying these two methods have led to the development of many fruitful hypotheses and theories, and many diagnostic and curative procedures of great value. It was early evident that the explanation of resistance to infection, either natural or acquired, must be sought in the cells or fluids of the body and especially of the blood. ”

“ Again, antibodies may be formed in response to antigens other than infective particles—thus the injection into suitable animals of foreign proteins such as egg albumin, heterologous blood sera or red blood discs from a different species of animal, will result in the formation of specific antibodies possessing definite affinities for their respective antigens. ”

“ Suffice it to say, that various scientists have learned that immunity may be produced in a previously susceptible animal by the injection of various preparations. But in each instance, the injection is expected to produce immunity from only one disease. My own studies were at first in this direction, and I have succeeded not only in learning how to prevent each malady separately, but what is far better, I have discovered a method by which I can render an individual immune to all zymotic diseases. ”