Identification and cloning of a complementary DNA encoding a vicilin-like proprotein, jug r 2, from english walnut kernel (Juglans regia), a major food allergen

BACKGROUND: Walnuts and other tree nuts are important food-allergen sources that have the potential to be associated with life-threatening, IgE-mediated systemic reactions in some individuals. OBJECTIVE: The purpose of this study was to characterize a complementary (c)DNA clone encoding one of the walnut food allergens. METHODS: A cDNA expression library prepared from walnut somatic embryo was screened for IgE reactivity with patient serum. A reactive clone of 2060 bp, which encoded a protein of 593 amino acids in length, was subcloned by excision into the pGEX expression vector. IgE-binding inhibition experiments were performed. RESULTS: A recombinant fusion protein was induced and shown to bind serum IgE from 9 of 15 patients tested, thus identifying a major allergen. This clone, named Jug r 2, exhibited significant homology with genes encoding the vicilin group of seed proteins. An IgE-binding inhibition experiment suggested that the encoded protein undergoes posttranslational modification into at least one major polypeptide (47 kd) and possibly several others, which is similar to the vicilin-like proteins characterized in cocoa bean (Theobroma cacao) and cottonseed (Gossypium hirsutum). N-terminal sequencing of the 47-kd band, Jug r 2, identified it as a mature protein obtained from the precursor. A second IgE-binding inhibition experiment showed that there is minimal or no cross-reactivity between Jug r 2 and pea vicilin, peanut proteins, or cacao proteins. CONCLUSION: Jug r 2 is the third vicilin food allergen identified in addition to vicilins from soy and peanut. The availability of recombinant food allergens should help advance studies on the immunopathogenesis and possible treatment of IgE-mediated food hypersensitivity.     

Food allergy diagnostics: scientific and unproven procedures

PURPOSE OF REVIEW: The accurate diagnosis of food allergy is crucial not only for the right treatment but also for the avoidance of unnecessary diets. The diagnostic work-up of suspected food allergy includes the measurement of food-specific IgE antibodies using serologic assays, the skin prick test, elimination diets and oral provocation tests. In addition, some approaches are either under further rigorous investigation (the atopy patch test) or are already in widespread use, particularly by practitioners of alternative or complementary medicine, but are considered unproven. These diagnostic methods include specific IgG to foods, provocation/neutralization testing, kinesiology, cytotoxic tests and electrodermal testing. This review covers some of the most common scientifically validated and unproven approaches used in the diagnosis of food allergy. RECENT FINDINGS: For specific serum IgE and the SPT, decision points have been established for some foods, allowing prediction of clinical relevance. The APT may be helpful, especially when considered in combination with defined levels of specific IgE. In regard to other approaches, most scientific studies do refute the usefulness of these approaches. SUMMARY: In most patients, controlled oral food challenges remain the gold standard in the diagnostic work-up of suspected food allergy. The skin prick test and measurement of specific IgE antibodies to food extracts, individual allergens or allergenic peptides are helpful in the diagnostic approach. Food-specific IgG continues to be an unproven or experimental test. The other alternative and complementary techniques have no proven benefit and may endanger patients via misdiagnosis.     

Thyrotoxic crisis in Graves' disease: Indication for immediate surgery

Summary Thyrotoxic crisis (thyroid storm) is a rare complication of hyperthyroidism. It can be observed not only in thyroid autonomy with latent hyperfunction after exposure to iodine, but also in Graves' disease with overt hyperfunction. Adequate management of thyrotoxic crisis is still controversial. We report about four patients (four women, mean age 75 years) with Graves' disease who developed thyrotoxic crisis during therapy with antithyroid drugs so that surgical intervention became necessary. The patients had been admitted to the hospital for nonspecific symptoms such as headache, cachexy, and psychosis. Thyroid hormone levels had reached twice the normal range prior to surgery. All patients showed severe neurological deficits leading to coma. In three cases euthyroidism was achieved within two days after surgery. The neurological symptoms disappeared after an average of four days. The postoperative course did not show severe complications and all patients recovered completely.Especially in the elderly a monosymptomatic or nonspecific course of thyroid storm with neurological symptoms may represent a severe and life-threatening situation. In these cases surgery can become necessary even if euthyroidism has not been achieved preoperatively.Abbreviations dl deciliter - FT3 free triiodthyronine - FT4 free thyroxine - Hg mercury - l liter - MAK microsomal antibodies - mg milligram - ml milliliter - mU milliunit - ng nanogram - T3 triiodthyronine - T4 thyroxine - TAK thyroglobulin antibodies - TBG thyroxine-binding globulin - TRAK TSH-receptor antibodies - TRH thyrotropin-releasing hormone - TSH thyroid-stimulating hormone - TT3 total triiodthyronine - TT4 total thyroxine - g microgram     

Pattern recognition within and across sensory modalities in normal and brain-injured children

For normal children, intermodal transfer (from touch to vision or from vision to touch) has been shown to be more difficult than intramodal transfer from vision to vision, but no more difficult than from touch to touch. This study extends the investigation to children with early brain damage and tests the claim that intermodal transfer is particularly vulnerable to such damage. Brain-damaged children do perform more poorly than younger normal children on the intermodal tasks employed, but the brain-injured children did even worse on those intramodal tasks that involved vision alone. An additional experiment showed that normal children performed as badly as the brain-injured as soon as one made the visual presentation of patterns sequential instead of simultaneous.     

Use and abuse of intravenous immunoglobulin

Used for more than 20 years to treat primary immunodeficiency disorders, intravenous immunoglobulin is now used also as therapy for many other disease states, including autoimmune disorders. However, IV immunoglobulin should not be used for diseases without a valid scientific basis.     

A Review of Non-Cystic Fibrosis Pediatric Bronchiectasis

With the implementation of vaccination programs and the use of antibiotics, developed countries have seen a decline in infection-related pediatric bronchiectasis. However, significant morbidity from bronchiectasis is still seen and both infectious and noninfectious causes of bronchiectasis in the pediatric population remain. A review of the literature will be presented including causes of pediatric bronchiectasis, clinical symptoms and signs, laboratory evaluation and imaging, as well as treatment options. This review stresses the importance of early evaluation and treatment in children with recurrent cough, sinusitis, potential foreign-body aspiration, or gastroesophageal reflux to prevent the complications of ongoing respiratory disease and bronchiectasis.     

Acute schizophreniform disorder in Hashimoto disease

While for some diseases with hyperthyreosis psychotic developments are well known, for a rare autoimmune thyroiditis, Hashimoto's thyroiditis, only one case of development of psychotic symptoms is known. In this case-study we present a 42-year-old white female who was admitted to hospital showing symptoms of acute psychosis. The results of the laboratory examinations showed the constellation of beginning Hashimoto's thyroiditis in hyperthyreotic state with high level of antithyroid peroxidase antibodies and comparatively low level of anti-TSH receptor antibodies. The patient recovered well in 4-weeks time under therapy with neuroleptics and benzodiazepines.     

Subclinical hyperthyroidism: Physical and mental state of patients

Summary We investigated whether subclinical hyperthyroidism [subnormal basal thyroid-stimulating hormone (TSH) level, attenuated TSH response to thyrotropin-releasing hormone (TRH) stimulation, peripheral thyroid hormones within normal range] is accompanied by physical and mental changes. Thirty-five subclinically hyperthyroid patients (27 female, 8 male) were compared with 60 overtly hyperthyroid patients (51 female, 9 male) and with 28 euthyroid control patients (18 female, 10 male) with respect to physical symptoms, affective state, short-term memory, ability to concentrate and psychomotor performance. Patients with subclinical hyperthyroidism ranged between the other two groups. The major difference between controls and subclinically hyperthyroid patients was an increase in frequency of nervous symptoms and symptoms due to an increase of metabolic rate and thermal regulation changes. The major differences between subclinically hyperthyroid and overtly hyperthyroid patients were psychomotor impairment and symptoms of increased metabolic rate. Self-ratings of affective state tended to be similar in patients with subclinical and overt hyperthyroidism. The ability to concentrate and short-term memory were not impaired in any group. Symptoms in patients with subclinical hyperthyroidism probably result from central changes which lead to attenuated TSH responses to TRH, or from elevated but still normal thyroxine levels, which possibly enhance the effect of catecholamines.