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Biomedical subjects

D L Klein

Publications and source records attributed to D L Klein.

At least 37 records · Page 2Linked to original sources
PubMed1980

Thoracic manifestations of aspergillosis.

The fungus Aspergillus can cause a variety of pulmonary disorders. Allergic bronchopulmonary aspergillosis is characterized by eosinophilic pulmonary infiltrates, bronchiectasis and bronchial mucus plugs, and can progress to chronic pulmonary fibrosis. There are four additional variant forms of allergic bronchopulmonary aspergillosis, which may or may not be associated with aspergillus hypersensitivity. They are mucoid impaction of bronchi, pulmonary infiltrates with eosinophilia, bronchocentric granulomatosis, and extrinsic allergic alveolitis. Intracavitary aspergilloma (mycetoma, or fungus ball) is a noninvasive Aspergillus colonization of virtually any type of preexisting pulmonary cavity or cystic space. Invasive pulmonary aspergillosis is a serious, usually fatal infection in patients being treated with immunosuppressions or who have chronic (malignant or nonmalignant) debilitating disease. Diagnosis of Aspergillus-caused pulmonary disorders is based on a combination of clinical, laboratory, and radiographic findings, all of which should be known to the radiologist.

Aspergillosis↗
PubMed1980

Macrophage cytostasis and T and B cell blastogenic transformation in mice treated with nystatin.

Treatment of normal BALB/c mice with nystatin, an amphoteric polyene, activated macrophages to become tumoricidal for MBL-2 lymphoblastic leukemia target cells while augmenting the in vitro blastogenic response of splenic lymphocytes to B and T cell mitogens. These responses were both shown to be highly dose dependent and occurred 6 days following the intraperitoneal injection of nystatin into normal mice. Macrophages from untreated mice did not show similar activity. The significance of these observations and the potential use of nystatin as a pharmacologic agent is discussed.

Animals↗
PubMed1980

Fc receptor mediated immune regulation and gene expression.

Exogenous Fc receptors (FcR) have been demonstrated to either augment or inhibit endogenous FcR mediated immunity, immune regulation and gene expression. Other immune regulatory or modulator molecules, such as the H2 histocompatibility antigens, interferon, transfer factor and leukocyte chalones might involve association with or alter the synthesis or status of FcR, thus effecting regulation of immunity and/or gene expression. FcR provide a unique opportunity for eliciting the mechanisms and perhaps altering the immunity and/or gene expression which influence immune regulation, cellular differentiation, viral replication and malignant transformation.

Animals↗
PubMed1979

Neutralization of immune complex inhibition of antibody dependent cellular cytotoxicity in vitro by Staphylococcus-aureus protein A.

Staphylococcus-aureus protein A (SPA) incubated with sera containing immune complexes and effector cells increases antibody dependent cellular cytotoxicity (ADCC)and rosette formation. The enhanced ADCC and rosetting is due to SPA functioning as an IgG Fc cellular receptor. SPA binds to the Fc portion of Igg and has much greater affinity for immune complexes than free IgG. SPA bound immune complexes are blocked from attaching to the Fc cellular receptors via a competitive inhibition which neutralizes the inhibitory effect of these complexes on ADCC and rosette formation.

Animals↗
PubMed1979

Augmentation and inhibition of delayed hypersensitivity by Staphylococcus aureus protein A.

The injection of Staphylococcus-aureus protein A into mice, previously exposed to an antigen (sheep red blood cells), is capable of augmenting or inhibiting a primary delayed hypersensitivity (DH) response. SPA enhances DH response to SRBC when given with a greater than optimal sensitizing dose of the antigen. At antigen doses optimal for eliciting DH to SRBC, SPA inhibited DH. A proposed mechanism for the action of Staphylococcus-aureus protein A is based upon the ability of the protein to function as a Fc cellular receptor, thus neutralizing the effect of antigen-antibody immune complexes on DH. The binding of protein A to the Fc portion of antigen-antibody immune complexes effectively prevents subsequent binding of these complexes to Fc cellular receptors, thus eliminating their participation as co-factors in inter-cellular immunological communication. The ability of protein A to both augment and inhibit DH suggests a role for relative concentrations of serum factors and/or cellular receptors in the regulation of a primary DH response.

Animals↗
PubMed1979

Suppression of DNA synthesis in mitogen stimulated leukocytes with partial trypsin digests of Staphylococcus aureus protein A.

Staphylococcus aureus protein A (SPA) acts as a mitogen stimulating DNA synthesis and is not antagonistic to the mitogenic activity of other mitogens. The mitogenicity of SPA is due to the protein's multivalent Fc antibody receptors. Partial trypsin digestion of SPA yields monovalent Fc antibody receptors which are not mitogenic. Using a thymidine incorporation assay, results indicated that tryptic digests of SPA added to mouse splenic leukocytes 12 hours after stimulation with either concanavalin A, lipopolysaccaride or SPA suppressed the DNA synthesis normally elicited by these mitogens. SPA was digested with 1% trypsin at pH 8 for varying periods of time. As the digestion time increased from 0 to 60 minutes the mitogenicity of the SPA-trypsin digests decreased indicating cleavage from multivalent to monovalent SPA Fc antibody receptors. The decrease in mitogenicity of the SPA digests was directly associated with increased ability to inhibit DNA synthesis in mitogen stimulated leukocytes. A proposed mechanism for the inhibition of DNA synthesis suggests that SPA-monovalent Fc antibody receptors mimic cellular Fc receptor function thereby influencing cellular gene expression.

Animals↗
PubMed1977

Acute renal carbuncle.

A renal carbuncle (cortical abscess) is an important and treatable consideration in the differential diagnosis of renal mass lesions. Diagnosis is accomplished using a combination of clinical, urographic, arteriographic and ultrasonographic findings. Ultrasound is an accurate and less invasive alternative to arteriography. Needle aspiration of the abscess contents may give a bacteriologic diagnosis. Non-surgical treatment with antibiotics alone may be curative. Five cases are presented, and clinical and radiologic features are reviewed.

Abscess↗