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Biomedical subjects

O L Frick

Publications and source records attributed to O L Frick.

At least 37 records · Page 2Linked to original sources
PubMed1985

Airway responsiveness to inhaled antigen, histamine, and methacholine in inbred, ragweed-sensitized dogs.

We studied the responses to antigen in animals selected from a colony of inbred dogs sensitized to specific allergens to determine if they had characteristics similar to those of human asthmatics. They were immunized with ragweed and grass pollen extracts (10 micrograms in alum) immediately after routine vaccination with attenuated live virus (distemper and hepatitis) and killed bacteria (Leptospira) at 4, 8, and 12 wk of age. Subsequently, ragweed and grass injections were repeated every 2 months. Immunized dogs made specific IgE-antibodies in serum averaging 3 to 4 times that of control animals (no immunization with pollen or vaccine). They showed positive skin responses to the injection of ragweed pollen extract, whereas control dogs did not respond to ragweed pollen by quantitative skin test or inhalation challenge. In immunized dogs under barbiturate anesthesia, air-flow resistance of the total respiratory system increased from 0.60 +/- 0.07 (mean +/- SEM) before to 12.6 +/- 3.4 cm H2O/lps 5 min after the start of antigen aerosol; respiratory resistance remained increased for 20 min and was associated with 0 hypoxemia and increased arterial plasma histamine. In addition, airway responsiveness to both inhaled histamine and methacholine was greater in immunized dogs than in nonimmunized dogs of comparable age. Airway responses to each agonist were highly reproducible on repeated testing. These results indicate that physiologic responses to antigen by inbred, ragweed-sensitized dogs resemble human asthma closely and that these dogs appear suitable for a variety of experimental studies of asthma with respect to pathogenesis, diagnosis, prevention, and treatment.

Animals↗
PubMed1983

Immunoglobulin E antibodies to pollens augmented in dogs by virus vaccines.

An inbred "atopic dog colony" was established to study the effect of viruses on immunoregulation of immunoglobulin (Ig) E antibodies. Dogs were selected for high skin reactivity to grass and weed pollens. Their offspring were inoculated with pollen extracts in alum immediately after routine vaccinations (attenuated live-virus vaccines for canine distemper and infectious canine hepatitis, and a killed bacterin for Leptospira). Heat labile antipollen IgE antibodies were measured by passive cutaneous anaphylaxis. Pups vaccinated for canine distemper before being given pollen extracts had many more IgE antibodies than did their control littermates who were not vaccinated until after the last pollen extract injection. This may be a natural example of the "allergic break-through phenomenon."

Adenoviruses, Canine↗
PubMed1981

Prevention of asthma.

Infants born of allergic mothers but normal fathers, who had eczema and who were fed cows' milk, had a significantly greater incidence of asthma (P less than 0.001) than infants with a similar history but who were breast-fed. An analysis of all breast-fed infants in the study showed that they were less likely to develop asthma than those who were bottle-fed (P less than 0.06). There was a lower incidence of allergy in infants born of families with allergic mothers and normal fathers, than in families in which both parents were allergic (P less than 0.02). In skin tests of both breast or bottle-fed babies, the two most common allergens eliciting reactions were egg and cat dander.

Animals↗
PubMed1980

Leukocyte inhibition factor in delayed-onset food allergy.

To investigate the possiblity of a cellular immune hypersensitivity reaction in patients who developed allergic symptoms 2 or more hours after ingestion of a particular food, two in vitro tests were employed: leukocyte migration inhibition factor (LIF) and lymphoblastogenesis. Of the children and adults with food allergy, 73% (30 of 41) had a positive LIF test with whole cow's milk or its fractions or corn. Of nonallergic or grass-pollen sensitive controls, 15% (four of 26) had positive LIF. Lymphocyte transformation often correlated with LIF results in food-allergic patients but was also positive in 77% of controls (seven of nine). We suggest that many patients with delayed-onset food-induced allergy symptoms may have a cellular immune component to their sensitivity. Serum IgA, where measured, was absent or low in half of these patients.

Adolescent↗
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↗
PubMed1979

Development of allergy in children. I. Association with virus infections.

Children born into allergic families, with two allergic parents, are at high risk of developing allergy within the first 5 years of life. In order to observe possible external factors in the sensitization process, a prospective study of 13 such children was done, in which serial clinical and immunologic observations were made at 3- to 6-month intervals over a period of 1 to 4 yr. Eleven of these children are now clinically allergic; 5 have asthma. Immunologic evidence for allergic sensitization was observed in these 11 children by RAST, antigen-induced leukocyte histamine release, lymphoblastogenesis, and rise in serum IgE. Upper respiratory infections (URI) occurred in these 11 allergic children 1 to 2 months prior to the onset of allergic sensitization. In 10 of these 11 URI children, complement-fixing antibodies to viruses (parainfluenza, RSV, CMV) increased in the same blood samples in which immunologic allergic sensitization was first evidenced. This coincidence suggests that certain viruses may contribute to the allergic sensitization process.

Child, Preschool↗
PubMed1976

Immunological development in infants of allergic parents.

Serum immunoglobulins were determined every 4 months from cord blood to age 2 years in ninety-two infants of allergic parents. By 7 months of age, the concentration of IgA was significantly greater in infants who developed atopic dermatitis than those who did not. The IgA was also significantly greater than in matched non-allergic controls. The difference continued to the end of the 2-year study. No significant difference was found in the three groups for levels of IgG and IgM. These findings differ from the results of a previous report and possible explanations are presented.

Humans↗
PubMed1976

The development of allergy in infants of allergic parents: a prospective study concerning the role of heredity.

Ninety-four infants of allergic mothers were studied from birth to age 24 months. If the father was also allergic, the family history was termed bilateral (36 infants); if the father was not allergic, the family history was termed unilateral (58 infants). Data concerning family history, methods of feeding (bottle versus breast) and allergic skin reactivity were obtained. Significantly, more infants developed allergy if they were from a bilateral allergic parentage (P = less than 0.044). When skin test negative, bottle-fed infants with a bilateral family history were compared to breast-fed infants with a unilateral family history, there was significantly less asthma in the latter group (P = less than 0.047). During the first three months of life there was significantly less atopic dermatitis in the breast-fed infants with an unilateral family history than in the breast-fed infants with a bilateral family history (P = less than 0.027). In this study it remained unclear why infants with positive allergy skin tests demonstrated a different incidence of allergic disease from those who were skin-test negative when the variables of family history were the same.

Asthma↗
PubMed1975

An ontogenic study of histamine and mast cells in the fetal rhesus monkey.

This study was designed to determine the presence of cell-bound histamine and mast cells, if any, in the lung and skin of nonhuman primate fetuses and neonates. The results indicate that cell-bound histamine can be detected in both tissues of the rhesus monkey fetus by 60 days of gestation, the earliest age examined, at levels that are 2% to 3% of levels present in yearling animals. Levels increase markedly during the least 1 1/2 mo of gestation; however, at birth, levels are only 12% to 46% of those observed in the yearling and are lower than levels observed at 150 days of gestation. Most cell numbers in lung and skin of the fetus closely parallel histamine content.

Animals↗