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Results for “Radioallergosorbent Test”

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PubMed1977

Longitudinal study of workers employed in the manufacture of toluene-diisocyanate.

Workers at a toluene-diisocyanate manufacturing plant were studied longitudinally to determine the effects of the chemical on their health. Studies included health questionnaire, pulmonary function, environmental monitoring, and immunologic testing. Workers reporting increased lower respiratory symptoms were from the nonsmoker group. Environmental monitoring showed frequent excursions of toluene-diisocyanate concentrations above the threshold limiting value. There was poor correlation between area and personal exposure levels. No exposure-related decline of pulmonary function was demonstrable. Immunologic studies showed development of a positive skin test to a toluene-diisocyanate-human serum albumin conjugate by some persons and an increasing incidence of toluene-diisocyanate-specific IgE antibodies as measured by a radioallergosorbent test. Toluene-diisocyanate did not induce histamine release from leukocytes in vitro but did diminish the in vitro stimulation of cyclic adenosine monophosphate by isoproterenol. Most of the clinically sensitive persons demonstrated adverse bronchial response when challenged by inhalation of toluene-diisocyanate. This response was dose dependent in some persons. When challenged with Mecholyl, clinically sensitive persons showed greater reactivity of airways than nonsensitive persons.

Antibodies↗

PubMed1984

Allergy testing in otology.

The allergic etiologic factors in many otologic diseases are becoming increasingly apparent. Recent advances in the understanding of mechanisms in atopic allergic reactions have resulted in the development of highly accurate diagnostic tools. The development of the radioallergosorbent test (RAST) for determining specific IgE has lead to very effective techniques of immunotherapy. Unfortunately, the mechanisms involved in nonatopic sensitivity, such as that found in food and chemical allergies, are still poorly understood. It is hoped that research will reveal the mechanisms of nonatopic disease and lead to effective in vitro diagnosis and treatment. Regardless of which techniques are used in diagnosis and treatment, education of the allergy patient is imperative to ensure that long-lasting good results are obtained.

Drug Hypersensitivity↗

PubMed1989

Occurrence of an anti-peplomycin IgE antibody cross-reacting with bleomycin in a patient with cervical uterine cancer.

An allergic reaction to peplomycin was observed in a patient with cervical uterine cancer who had previously been treated with peplomycin. A positive Prausnitz-Küstner test and its elimination after heat treatment of the serum showed the production of anti-peplomycin IgE antibody. Peplomycin was coupled to a paper disc and a sensitive radioallergosorbent test for peplomycin was developed to quantitate the antibody. Patient serum IgE and IgG were purified by DE52 column chromatography; the IgE fraction contained binding activity to peplomycin. A competition test revealed that the antibody bound to both peplomycin and bleomycin. DNA, RNA, and mononucleotides had no effect on antibody binding, but the antibody inhibited peplomycin's activity.

Aged↗

PubMed1978

Immediate-type hypersensitivity to reactive dyes.

Reactive dyes have gained extensive use in recent years. This paper reports four cases of immediate-type occupational allergy to these compounds. All the patients had had symptoms of asthma and allergic rhinitis, and had been weighing dyes for a minimum of 2 years. The skin prick tests were positive, and nasal and bronchial provocation challenges also produced positive immediate reactions. A high serum titre of specific IgE could be demonstrated for at least one dyd by the radioallergosorbent test. The identification of specific IgE shows that the mechanism of the hypersensitivity is immunological, reactive dyes acting probably as haptens.

Adult↗

PubMed1977

Provocation with cow's milk and cereals in atopic dermatitis.

Oral provocation test with cow's milk and cereals were performed in 81 children with atopic dermatitis, all below 5 years of age. In 15 of the children exacerbation of the dermatitis occurred on the second or third day after initiation of the tests. These patients, whose mean age was 13 months, underwent repeated provocation during the ensuring 18 months. Eleven children lost their sensitivity to the offending foods and 2 children became more tolerant during this period. Initial levels of serum IgE and specific reagins against the foods tested did not distinguish those patients who were positive to the provocation tests. In this group, however, reagins against egg white were significantly increased. The specific serum reagins were unaltered or increased in the majority of cases during the period of study. The radioallergosorbent test (RAST) was found of limited value as a screening tool in patients with atopic dermatitis in whom exacerbation of the condition appears to be caused by food sensitivity.

Allergens↗

PubMed1991

Fractionation and immunological characterization of allergens and allergoids of Prosopis juliflora pollen.

Allergoids of Prosopis juliflora pollen were prepared by formalinization of crude allergen and glycoprotein. Fractionation of crude allergen and allergoids on Sephadex G-100 resulted in separation of proteins of varying molecular size and a glycoprotein of 81 to 13 KD. Allergoids prepared from the glycoprotein fractionated into two proteins of approximately 200 KD and more than 200 KD. Crossed immunoelectrophoresis indicated 12 and gel diffusion test 3 precipitating antigens incrude allergen extract; by these tests allergoids depicted 8 and 3 precipitin bands, respectively. The precipitin analysis showed heterogeneity of allergenic determinants and also variation in cross-immunogenicity of the formalinized derivatives. The skin prick and radioallergosorbent tests depicted greater activity of fractionated crude allergens than the allergoids. The above tests suggest altered and concealed antigenic determinants as result of formalinization of P. juliflora pollen which, however, showed reduced allergenic activity relative to the native allergen.

Allergens↗

PubMed2006

Skin testing for immediate hypersensitivity to betalactams: comparison between two commercial kits.

INTRODUCTION: Skin testing with major and minor determinants of benzylpenicillin is the recommended standard practice to evaluate subjects with immediate hypersensitivity to betalactams. The withdrawal of these products from the market has set us back to the early days, before the introduction of reagents for in vivo testing. OBJECTIVES: To compare a recently released kit of benzylpenicillin conjugated to poly-l-lysine (PPL) and minor determinants mixture (MDM) with the previously existing kit in a positive control group of subjects sensitized to major and/or minor determinants of benzylpenicillin. METHODS: Skin tests with both kits were made in a group of positive subjects previously diagnosed with immediate hypersensitivity to penicillins and with positive results to PPL and/or MDM and in a negative control group. Radioallergosorbent test (RAST) inhibition assays with a pool of sera and individual samples were carried out to compare the inhibition capacity of PPL and MDM of both kits. RESULTS: Of 22 cases selected from our historical group, 14 were positive: eight to PPL, three to MDM and three to both. These results were equivalent for both kits. RAST inhibition studies showed similar potencies in the inhibition of PPL and MDM. CONCLUSIONS: Both tests show similar results in terms of RAST inhibition assays and skin tests sensitivity and specificity in the groups selected. The new assay can be used for the same purpose and indications as the previous test.

Drug Hypersensitivity↗

PubMed1995

Fc epsilon RI-beta polymorphism and risk of atopy in a general population sample.

OBJECTIVE: To establish the prevalence of Fc epsilon RI-beta polymorphisms Leu181 and Leu181/Leu183 on chromosome 11q13 in the general population and to examine whether when maternally inherited they confer a risk of atopy. DESIGN: A population based survey for measures of atopy (skin prick test reactions, specific IgE titres, total serum IgE concentration), bronchial hyperresponsiveness, and carriage of Fc epsilon RI-beta Leu181 and Leu181/Leu183. SETTING: The rural coastal town of Busselton, Western Australia. SUBJECTS: 1004 members of 230 two generation families identified through adults aged under 55. RESULTS: Fc epsilon RI-beta Leu181/Leu183 was identified in 45 subjects (4.5%). All 13 children who had inherited the variant maternally were atopic. Six had asthma and nine rhinitis. The odds ratio of a positive skin prick test reaction to house dust mite or grass pollen in these children compared with the other 523 children was 7.37 (95% confidence interval 1.62 to 33.60). The 95% confidence interval for the odds ratio of a positive specific IgE response (radio-allergosorbent test) was 3.00 to infinity, and the odds ratio for bronchial hyperresponsiveness was 3.70 (1.21 to 11.60). By contrast, the eight children who had derived the variant paternally had negative skin prick and radioallergosorbent test results and did not have increased bronchial responsiveness. CONCLUSION: Fc epsilon RI"' beta Leu181/Leu183 when inherited maternally identifies a genetic risk factor for atopy and bronchial hyperresponsiveness.

Adolescent↗

PubMed2001

Polyisotypic antipeanut-specific humoral responses in peanut-allergic individuals.

BACKGROUND: Peanut-containing food products may induce severe clinical reactions in sensitized subjects, and high levels of antipeanut IgE have been reported in the literature. Immunotherapy, proposed for the prevention of severe accidents, is often ill-tolerated and only partly efficient. This could be due to the spontaneous development of polyisotypic antipeanut antibodies. OBJECTIVE: To appreciate the presence and reactivity of other isotypes other than IgE of peanut-specific antibodies in serum samples from peanut-sensitized subjects. METHODS: Serum samples were obtained from 20 non-sensitized subjects and 23 sensitized patients divided in three groups according to their response to peanut oral challenge (no response or response to high or low doses, respectively). Peanut-specific IgG, IgG subclasses, IgA and IgM were assayed using an ELISA, and their reactivity against peanut proteins tested using Western Blot. RESULTS: A large dispersion of antipeanut antibody levels was observed in the three groups of patients, high levels of IgG, IgG1, IgG4 and IgA usually correlating with highly positive radioallergosorbent test (RAST). Such high levels were observed at onset in four patients who underwent peanut immunotherapy who had side effects and poor efficiency. Western blotting demonstrated that the polyisotypic response observed was directed to several peanut antigens, including the major allergens, Ara h1 and Ara h2. CONCLUSION: Peanut-sensitized patients who spontaneously develop specific IgE, display polyisotypic-specific antibody responses, whatever their response to oral challenge. This might explain the poor efficiency of peanut rush immunotherapy attempts.

Adolescent↗

PubMed1996

Acute urticaria caused by pigeon ticks (Argas reflexus).

A 28-year-old man was admitted to our institute because of acute urticaria appearing a few hours earlier. The patient stated that during sleep he had been bitten by a large number of "insects," which had dropped from wooden ceiling beams under the roof of his room. The patient was living in the center of Milan in a very old house, where numerous pigeons had built their nests under the rooftop. The patient brought along with him some examples of these "insects," which were later classified as pigeon ticks (Argas reflexus) (Figs. 1,2). Dermatologic examination revealed the presence of numerous wheals and erythemato-papular lesions on the neck and trunk. These lesions were of different shapes and sizes, bright red in color, and with a small central ulceration corresponding to the tick bite. In addition, there were numerous excoriated lesions due to scratching; the patient in fact complained of very intense pruritus. The general physical examination was within normal limits. Laboratory examinations revealed only slight leukocytosis (9300 WBC/mm3). All other laboratory tests were negative; in particular, the assay for anti-Borrelia burgdorferi IgG and IgM was within normal ranges (< 1:256 and < 1:64, respectively). These results were confirmed on subsequent blood samples. Positive radioallergosorbent tests (RAST) to a somatic extract and to the saliva of the tick were observed. A diagnosis of acute urticaria caused by A. reflexus was made. The patient was treated with betamethasone (4 mg intravenously) and chlorpheniramine (10 mg intramuscularly), with resolution of the clinical picture within 3 days.

Acute Disease↗

PubMed1995

Occupational allergy caused by spathe flower (Spathiphyllum wallisii).

Occupational allergy caused by plants is seldom reported although it is probably relatively common. We report on a 22-year-old male atopic caretaker of plants who developed IgE-mediated allergic rhinitis, laryngitis, pharyngitis, and contact and generalized urticaria caused by exposure to spathe flower (Spathiphyllum wallisii) while he was working for a firm that supplied plants to offices. He also had an asthmatic attack at work, but in bronchial provocation tests conducted 8 months after he had stopped doing the work in question, he developed rhinoconjunctivitis, pharyngitis, and laryngitis, but exhibited neither bronchial reaction nor fall in PEF values. Prick tests with spathe flower gave 3+ reactions for exudates from the flower, pollen, stem, and leaves. He also had several positive reactions to fruits, vegetables, and spices, but not to natural rubber latex. The radioallergosorbent test with spathe flower was positive (3.4 PRU/ml, close to class 3). In protein staining with SDS-PAGE, one heavy band was detected at about 14 kDa, and other faint bands were visible on both sides. Six faint bands were detected at the mol. mass range of 30-67 kDa. In IgE immunoblotting, one heavy band was detected at about 14 kDa. The patient became symptomless after he had ceased working with plants.

Adult↗

PubMed1981

The human basophil degranulation test as an in vitro method for the diagnosis of allergies.

We have designed a human basophil degranulation test based on a one-step method of basophil staining after exposure to a specific allergen. This very simple test is now commercially available as a ready-to-use kit. It explores the allergic sensitivity at the cellular level, probably through IgE-dependent sensitization of the basophil. It positively correlates with histamine release and radioallergosorbent test (RAST). It detects sensitivity to common allergens and to chemical and food products as well. In its present state, the test provides a simple, inexpensive specific means for in vitro diagnosis of allergic diseases. Recently, it has been further developed to be performed on the automatic Hemalog D Technicon machine.

Allergens↗

PubMed1988

A longitudinal study of the occurrence of bronchial hyperresponsiveness in western red cedar workers.

Two hundred twenty-seven workers in a western red cedar sawmill underwent methacholine bronchoprovocation testing at least 2 times during 3 surveys over a 2-yr period. At the first survey, workers completed a respiratory and occupational questionnaire, performed spirometry, gave serum for measurement of plicatic acid-specific IgE antibodies by radioallergosorbent testing, and had skin prick tests to detect atopy. Bronchial hyperresponsiveness was present initially in 18% of the workers. Approximately 15% of those with initially no hyperresponsiveness developed hyperresponsiveness during the follow-up period; 15% of those with initial hyperresponsiveness also lost it during follow-up. Development of hyperresponsiveness tended to coincide with a decrease in level of pulmonary function, whereas loss of hyperresponsiveness was associated with improvement in pulmonary function. Workers with either persistent bronchial hyperresponsiveness or with varying responsiveness had a higher prevalence of plicatic acid IgE antibodies and lower levels of initial pulmonary function than did workers with persistent nonresponsiveness. Workers with persistent hyperresponsiveness had higher initial estimated total airborne dust exposure than did other workers. Age, duration of sawmill employment, atopy, race, and cigarette smoking did not influence the occurrence of hyperresponsiveness. Levels of plicatic-acid-specific IgE antibodies did not change substantially over the 2 yr. These results indicate that immunologic sensitivity to plicatic acid and change in airway caliber are associated with the occurrence of bronchial hyperresponsiveness in cedar workers.

Allergens↗

PubMed1999

Skin test evaluation of genetically engineered hypoallergenic derivatives of the major birch pollen allergen, Bet v 1: results obtained with a mix of two recombinant Bet v 1 fragments and recombinant Bet v 1 trimer in a Swedish population before the birch pollen season.

BACKGROUND: More than 95% of birch pollen-allergic subjects react with the major birch pollen allergen, Bet v 1, and almost 60% of them are sensitized exclusively to this allergen. OBJECTIVE: The aim of this study was to compare the in vivo biologic activity of genetically engineered hypoallergenic derivatives of Bet v 1 (an equimolar mixture of 2 recombinant [r] Bet v 1 fragments and of rBet v 1 trimer) with that of rBet v 1 wild-type by skin prick and intradermal testing. METHODS: Birch pollen-allergic patients who had not received immunotherapy (n = 23), a group of allergic patients without birch pollen allergy (n = 12), and nonatopic persons (n = 8) from northern Europe (Sweden) underwent skin prick and intradermal testing with different concentrations of the recombinant allergens and commercial birch pollen extract before the birch pollen season. Immediate and late-phase reactions were recorded and allergen-specific IgE and IgG subclass responses were determined by CAP radioallergosorbent test and ELISA, respectively. RESULTS: Atopic persons without birch pollen allergy and nonatopic individuals did not have skin reactions to rBet v 1 wild-type and genetically engineered hypoallergenic derivatives. By intradermal testing, 8 of 23 and 13 of 23 birch pollen-allergic patients did not react with the highest concentration (1 microg/mL) of the rBet v 1 fragment mix and rBet v 1 trimer, respectively, compared with 1 with rBet v 1 wild type. Likewise, the highest concentration (100 microg/mL) of fragment mix or trimer failed to elicit a positive skin prick test in 18 of 23 and 15 of 23 patients in comparison with 0/23 with the monomer. No late reactions were observed. CONCLUSION: The recombinant hypoallergenic birch pollen allergens can probably be used for patient-tailored immunotherapy with a reduced risk to induce anaphylactic reactions.

Adolescent↗

PubMed1976

Penicillin allergy studies by a modified red-cell-linked antigen-antiblobulin reaction.

A red-cell-linked antigen-radioactive antiglobulin reaction (RCLA AR) is reported which may be combined with the conventional red-cell-linked antigen-antiglobulin reaction (RCLAAR) to measure antibodies of all five immunoglobulin calsses against the same determinant at the same time. The method has been applied to sera from penicillin-allergic patients and controls. Human erythrocytes coated with rabbit antibodies carrying penicilloyl groups were incubated with the serum to be tested, then washed. 125I-labelled anti-human IgE was added and, after further incubation and washing, the radioactivity retained by the cells was counted. This gives a measure of the specific IgE in the test sample. Other aliquots of the coated cells were treated with specific antiglobulin reagents in the usual manner of the RCLAAR in order to determine antibodies of other classes. The sensitivity for IgE was similar to that of the radioallergosorbent test. Information was also obtained about specific IgG subclasses.

Animals↗

PubMed1980

Immediate hypersensitivity to seminal fluid and atopic dermatitis.

A woman with atopic dermatitis experienced anaphylactic episodes following intercourse with her husband, with subsequent exacerbations of her atopic dermatitis. Skin testing and an in vitro leukocyte histamine release assay established the diagnosis of immediate hypersensitivity to her husband's seminal fluid; delayed hypersensitivity to seminal fluid could not be demonstrated. Antigen was found in the seminal fluid of nonrelated men. Radioallergosorbent testing detected the presence of circulating IgE antibodies specific for seminal plasma protein. Immunotherapy with seminal plasma may have limited the severity of a subsequent reaction. Serum from the husband and nonrelated men also contained antigen that provoked histamine release from the patient's leukocytes in vitro. The antigen in serum was associated with the globulin fraction and had a temporal relationship to ejaculation, appearing within 12 hours of ejaculation and disappearing within four days.

Adult↗

PubMed1997

Pollinosis due to Australian pine (Casuarina): an aerobiologic and clinical study in southern Spain.

An aerobiologic and clinical survey was conducted in Málaga, southern Spain, in order to determine fluctuations of Australian pine (Casuarina) pollen in the atmosphere of the city, and the prevalence of sensitivity in a nonatopic population. The aerobiologic survey, using a Burkard spore trap, was conducted from January 1991 to December 1994, and sensitization was ascertained by the skin prick test. The pollen season is relatively short and the pollen dispersion period occurs during October and November, mainly during the last 3 weeks of October. Diurnal patterns showed that the highest concentrations of pollen occur between 12 a.m. and 2 p.m., the most influential variables in its dispersion being temperature, sunshine, and rainfall. The prevalence of sensitization to Casuarina pollen was determined by skin prick test (SPT) in a nonatopic population of 210 patients with a previous history of autumn rhinitis, asthma, or rhinitis asthma. Six subjects showed a positive reaction to the pollen extracts, and the presence of specific IgE was demonstrated by the conventional radioallergosorbent test (RAST > or = 2) in five of these patients with positive SPT.

Adolescent↗

PubMed1991

Anaphylactoid reaction to intravenous hydrocortisone sodium succinate: a case report and literature review.

Reports of corticosteroid sensitivity reactions are rare in the medical literature. We report an anaphylactoid reaction to hydrocortisone sodium succinate given intravenously which occurred on two occasions during treatment of a patient for asthma. Intradermal testing with a wide range of steroid preparations gave positive results with hydrocortisone sodium succinate, methylprednisolone sodium succinate, methylprednisolone sodium succinate and methylprednisolone acetate. No reactions occurred to dexamethasone sodium phosphate administered intravenously, prednisolone given orally or beclomethasone dipropionate by inhalation. Results of a radioallergosorbent test (RAST) were negative for hydrocortisone sodium succinate.

Administration, Inhalation↗