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Biomedical subjects

H B Richerson

Publications and source records attributed to H B Richerson.

At least 73 records · Page 4Linked to original sources
PubMed1979

Cutaneous and nasal allergic responses in ragweed hay fever: lack of clinical and histopathologic correlations with late phase reactions.

The present study was designed to test the hypotheses that late cutaneous and nasal responses to allergen in patients with ragweed hay fever were human correlates of cutaneous basophil hypersensitivity, and that late responses in the nose and skin reflect similar pathogenesis. Forty-seven patients with ragweed hay fever were studied during a ragweed season for peripheral basophilia and clinical patterns reflecting late responses. Provocative nasal challenge, skin testing, and biopsy were carried out subsequently in 21 of the same patients during the winter months. Conclusions were as follows: (1) no histologic features distinguish positive from negative late skin reactions at 24 hr in patients with immediate wheal-and-flare responses; (2) cutaneous basophil hypersensitivity, i.e., tissue basophilia, is not a distinguishing feature of late skin responses in ragweed pollenosis; (3) seasonal peripheral basophilia was not found; (4) late responses in the nose were difficult to document objectively and did not correlate with late skin reactions; and (5) lymphocyte responses to antigen failed to correlate with late responses in either the nose or the skin.

Basophils↗
PubMed1979

Basophil chemotaxis under agarose: variability among guinea pig donors and response to sera of different species.

Guinea pig basophils were tested against chemotactic factor(s) generated from homologous and heterologous sera. An "under agarose" method of quantitating leukocyte chemotaxis was adapted to measure serum-derived basophil chemotactic factor(s) (BCF). The method was found to be simple, reproducible, and sparing of time and reagents and it provided simultaneous controls. Because of the economy of reagents compared with the Boyden chamber technique, basophils from individual guinea pigs could be studied and were found to be variable in responsiveness. A definite difference in the response of guinea pig basophils to zymosan-activated sera of various other species was demonstrated. Guinea pig basophils responded to zymosan-activated serum from guinea pig and rat but failed to respond to zymosan-activated serum from human, hamster, rabbit, or cow. Optimal conditions were determined for cell numbers, serum activation and dilution, and migration times for studies of guinea pig BCF. The under agarose technique provides a practical alternative to chamber methods for the study of basophil chemotaxis. Although guinea pig basophils do not respond to human serum-derived BCF, the economy of reagents with this technique gives promise toward adaptation of the method to studies of human basophil chemotaxis.

Animals↗
PubMed1978

Asthma in adults II: the patient in status asthmaticus.

A life-threatening emergency requiring intensive hospital care, status asthmaticus responds to therapy with aminophylline, epinephrine, and steroids. Spirometry and blood gas measurements are used to follow the patient's progress.

Adult↗
PubMed1978

Paraquat lung injury in rabbits.

An aerosol model for the study of paraquat (PQ) toxicity was developed using a 134 litre chamber and an ultrasonic nebuliser. Three groups of New Zealand white rabbits weighing 2-3 kg were studied. Group I (n = 6) was exposed to 10 g PQ/100 ml double-distilled water (DDW), Group II (n = 24) was exposed to 200 mg PQ/100 Ml DDW and a control group (n = 6) was exposed to 100 ml DDW. In a second experiment ten animals (Group III) were exposed to 10 mg PQ/100 ML DDW over a three-month period together with a control group (n = 5). Group I animals died with extensive haemorrhagic pneumonitis 38 hours after the last challenge. Most animals in Group II surviving more than three exposures had a significant reduction (P less than 0.001) in arterial oxygen tension (PaO2) and an increase (P less than 0.001) in the alveolar-arterial O2 gradient. Specific compliance decreased (P less than 0.005) and functional residual capacity and breathing frequency increased (P less than 0.05). Tissue PQ values showed even pulmonary distribution, with evidence of PQ accumulation after repeated inhalation. The lungs showed focal interstitial fibrosis, interstitial thickening, proliferation of macrophages in the alveoli, epithelioid changes in the interstitium, Type II cell hyperplasia, and foci of acute inflammation with consolidation. Controls and Group III animals were normal. This indicates that repeated inhalation of paraquat aerosol induces dose-related interstitial pneumonitis and fibrosis in rabbits.

Animals↗
PubMed1978

Studies of the radioallergosorbent test and the lymphocyte stimulation index in symptomatic ragweed pollenosis.

We followed 47 ragweed hay fever patients (not on immunotherapy) through a ragweed season by means of clinical evaluation and symptom scores. The radioallergosorbent test (RAST) and lymphocyte stimulation index (LSI) were done to determine their reliability as predictors of clinical symptomatology. Symptom scores of 10 or above, denoting at least moderate daily symptoms, occurred in 36 patients (80%). Preseasonally, RAST class 2 or above was found in 34 patients (75%), of whom 29 patients (64%) had symptom scores of 10 or above. At that time, LSI was elevated in about 50% of the patients. Patients in RAST class 3 had the highest LSI as a group. Seasonal exposure boosted the LSI in 50% of the patients, whereas 25% were unchanged and 25% showed a decrease. The results suggest that neither RAST nor LSI are reliable predictors of clinical severity in ragweed pollenosis.

Adult↗
PubMed1978

Chronic experimental interstitial pneumonitis in the rabbit.

The effects on the lungs of chronic aerosol and intravenous antigen challenges in preimmunized and control rabbits were studied. Soluble and particulate antigens included ovalbumin, keyhole limpet hemocyanin, antigen-adsorbed latex particles, glutaraldehyde cross-linked ovalbumin, and killed bacille Calmette-Guérin (BCG). Despite the development of acute alveolitis in sensitized animals, chronic aerosol challenge with both soluble and particulate antigens failed to produce chronic interstitial lung disease. Chronic intravenous challenge with killed BCG, but not other particulate antigens, resulted in a progressive interstitial pneumonitis, with evidence of fibrogenesis in animals that had been presensitized to tuberculin by toepad injection of complete Freund's adjuvant. Adaptive alveolar clearance mechanisms thus appear to protect rabbits from chronically inhaled antigen. Pulmonary circulatory clearance of BCG, however, results in an interstitial pneumonitis that is dependent on previous sensitization.

Aerosols↗
PubMed1977

Clinical evaluation of intranasal topical flunisolide therapy in allergic rhinitis.

A double-blind, vehicle control, parallel clinical trial evaluated the effectiveness and safety of the local application of flunisolide, a potent new topical steroid, in the treatment of ragweed hay fever. Fifty patients with well-defined, poorly controlled ragweed allergy were studied during the 1974 ragweed season. Analysis of the data showed that the active drug group had a significant decrease in individual symptoms of sneezing, nasal stuffiness, and nasal secretions, compared with the placebo group. Antihistamine usage was statistically decreased in the active drug over placebo group. There was no evidence of adrenal suppression. This study indicates that intranasal administration of flunisolide in adult patients is both efficacious and safe in the treatment of seasonal allergic rhinitis.

Administration, Intranasal↗
PubMed1977

Experimental leukocyte-induced pulmonary vasculitis with inquiry into mechanism.

Intravenous transfusions of washed allogeneic or autologous leukocytes in rabbits resulted in lesions of pulmonary periarteritis 48 hours later. Intact leukocytes were required. Systemic anaphylaxis, generalized Shwartzman reaction, alternate pathway complement activation and inert particle microembolism failed to produce identical lesions. Leukocytes tagged with radioactive chromium were found within arterial thromboses with proximal vasculitis. Generation or release of inflammatory factors plus thromboembolism would explain the pathogenesis of the lesions described. Specific mechanisms may be quite complex. Similar lesions have not been described in studies of pulmonary leukocyte entrapment or experimental microembolism of the lung. This model may be useful for studying pathogenetic mechanisms in pulmonary vasculitis and may have clinical implications.

Animals↗
PubMed1976

Immunology of Allergy.

Immune reactions, presumably developed to rid organisms of troublesome invaders, are rather frequently associated with responses that result in injury to host tissue. Such responses are manifestations of allergy or hypersensitivity, and involve antibodies of certain immunoglobulin classes, complement components, mast cells and basophils, lymphocytes, macrophages, and various pharmacologic mediators and other soluble substances in an exuberant array of possible combinations. An understanding of clinical hypersensitivity diseases is aided by classifying basic allergic mechanisms into four main types: anaphylactic (Type I), cytotoxic (Type II), complex-mediated (Type III), and cell-mediated (Type IV), which may participate in various combinations in disease states.

Allergens↗
PubMed1976

Allergic alveolar diseases. Problems in diagnosis and management.

One of the diagnostic possibilities to consider when a patient presents with cough, fever, dyspnea, or pulmonary infiltrates is hypersensitivity pneumonitis. Some of the problems encountered in diagnosis of diffuse lung disease are illustrated in two case reports. In one of the cases, interstitial pneumonitis of insidious onset was attributed to inhalation of thermophilic organisms in moldy silage. In the other, the outstanding pathologic feature was bronchiolitis obliterans, and circumstantial evidence pointed to a home humidifier as the source of the problem.

Adolescent↗
PubMed1975

Light and immunofluorescent study of the Arthus reaction in the rabbit lung.

A localized Arthus reaction was produced in the lung of sensitized rabbits by delivery of antigen into a lower lobe bronchus using a method of selective bronchial catheterization under fluoroscopy. The rabbits were sensitized with bovine immunoglobulin G (B-IgG) in incomplete Freund's adjuvant (IFA) to produce precipitating antibody without classic delayed hypersensitivity. Pulmonary histopathology was studied at intervals following antigen challenge, using light and immunofluorescent microscopy. Gross lesions peripheral to the lower lobe bronchus receiving antigen were found within 12 hr. Subsequent necrosis resulted in a dense scar by 6 wk. Microscopically, early lesions were typified by localized bronchitis, bronchiolitis, alveolitis, and vasculitis with exuberant exudates containing predominantly polymorphonuclear leukocytes. Extensive focal necrosis was present by 72 hr. Immunofluorescent studies revealed the presence of B-IgG, rabbit IgG, and complement (C3) in and around bronchi, bronchioles, alveoli, and vessels. No granulomatous lesions were found, and proliferation of alveolar lining cells was not detected in these studies. Thus, the lung can participate in an acute Arthus reaction following local antigen challenge in systemically sensitized animals. The pathology more closely resembles a necrotizing bacterial pneumonia than an interstitial or hypersensitivity pneumonitis under the conditions of this experimental system. Implications for human disease are speculative.

Animals↗
PubMed1975

Oncofetal protein accompanying irradiation-induced small-bowel adenocarcinoma in the rat.

A tumor-associated protein was found in tissue derived from an X-irradiation-induced adenocarcinoma in the small bowel of the rat. The protein was associated with the cell membranes of the tumor tissue. It shared common antigenic determinants both with a rat fetal protein and a perchloric acid-soluble protein isolated from the serum of the tumor-bearing rat.

Adenocarcinoma↗