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Biomedical subjects

J K Frost

Publications and source records attributed to J K Frost.

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

An evaluation of herpes simplex virus antigenic markers in the study of established and developing cervical neoplasia.

Previous reports from our laboratory have shown that antiserum to "pure" AG-e, a type-common HSV antigen, specifically stains atypical cervical cells in indirect immunofluorescence. These observations have been confirmed and extended. Antisera were prepared against the two protein components of pure AG-e, designated ICP 12 (M. W. = 140,000) and ICP 14 (M. W. = 130,000), and were purified to radiochemical homogeneity by SDS-acrylamide gel electrophoresis. The antisera reacted as well as antiserum to pure AG-e in immunofluorescence with HSV-2-(G)-infected cells, and their reactivity was adsorbed with pelleted HSV-2 (G) virions. Unlike antiserum to pure AG-e, the antisera to ICP 12 and ICP 14 were nonreactive in immunodiffusion, and only antiserum to ICP 12 showed complement fixation with soluble viral antigenic mixtures. Antisera to pure AG-e, ICP 12 and ICP 14 specifically stained exfoliated cervical cells from patients with herpetic cervicitis and atypical cells from patients with atypia, carcinoma in situ (CIS) or invasive cancer. However, both the number of patients with a positive response and the number of staining atypical cells were greater with antiserum to pure AG-e than with antisera to ICP 12 or ICP 14, suggesting that AG-e is a superior marker. Cells staining with antiserum to pure AG-e, individually identified, were classified as atypia (mild to marked), CIS or cancer. The ability of the antiserum to pure AG-e to identify atypical cervical cells was compared to cytopathologic screening in a blind study of 26 patients. A good correlation (80% to 93.8%) was observed, indicating that pure AG-e is a sensitive and specific marker for the identification of atypical cells.

Antibody Specificity↗
PubMed1980

Microphotometric differentiation of human T and B cells tagged with monospecific immunoadsorbent beads.

A comparative and statistical study was done of the classification of peripheral blood lymphocytes (PBLs) as T cells, B cells and monocytes by various immunologic procedures and computerized microphotometric analysis. PBLs from 15 healthy male subjects were examined by immunofluorescence, E rosettes, and immunoadsorbent beads (IAB) for T cells and B cells, by phase contrast microscopy and as fixed slide preparations. Cells tagged with IAB for T cells and B cells were fixed, stained with Papanicolaou stain and analyzed. Evaluation of immunologic data shows 50% to 57% T cells, 9.7% to 24.1% B cells, 13.4% to 16.1% monocytes and about 20% unmarked cells. Analysis of T cells shows significant correlations between E and T cell-IAB rosettes, but neither rosetting procedure reveals a positive correlation with immunofluorescence-labelled T cells. Comparison of B cells shows an insignificant correlation between B-cell IAB and immunofluorescence. Results showed that permanent slides of rosetted cells can be made without alteration in relative numbers of rosetted cells. Assessment of immunologically tagged cell samples by image analysis correctly classified 80% to 90% of cells as T and B cells. Evaluation of homogeneity of the T and B cell populations shows the existence of four subsets of B cells and five subsets of T cells.

B-Lymphocytes↗
PubMed1979

Morphological identification of alpha-1-antitrypsin in pulmonary macrophages.

Pulmonary macrophages, as seen in the routine sputum samples obtained from smokers, reveal bipolar orangophilic spurs. By use of histochemical and immunofluorescence techniques, these spurs have been found to contain alpha-1-antitrypsin. Morphological localization of this substance within the pulmonary macrophages may be significant.

Histocytochemistry↗
PubMed1979

Centrifugal separation of cells in sputum.

A centrifugation technique was developed and used to separate fixed cells from the sputa of patients with bronchogenic squamous cell carcinoma and ones with no evidence of cancer. This article presents the relative frequencies of occurrence of five cell types (i.e., leukocytes, macrophages, squamous, columnar and atypical/cancer) in specimen fractions separated from a discontinuous aqueous Ficoll density gradient. These differential counts show that individual cell types may be selectively collected. Atypical and cancer cells are found at high-density gradient fractions (p congruent to 1.138-1.155 g/ml) with a 10-fold enrichment over unprocessed samples.

Carcinoma, Bronchogenic↗
PubMed1979

Automatic cell identification and enrichment in lung cancer. I. Light scatter and fluorescence parameters.

Two physical parameters were investigated to automatically recognize cells in sputum from human squamous cell carcinoma of the lung and to separate them for preparation by the Papanicolaou methods, for human interactive identification and for automated high resolution image analysis. The two parameters, 0.5-15.0 degrees forward argon-ion laser light scatter to estimate total cell size and 546 nm Acridine orange fluorescence to approximate total cell DNA content, were measured in a flow-through fluorescence activated cell sorting system. Enrichment for neoplastic cells in three cases of squamous cell carcinoma of the lung averaged 7.8-fold over the original sputum when only green fluorescence was used and 10.5-fold using green fluorescence and forward light scatter. The average enrichment for neoplastic cells was 65.6-fold relative to polymorphonuclear deenrichment.

Carcinoma, Squamous Cell↗
PubMed1979

Automatic cell identification and enrichment in lung cancer. II. Acridine orange for cell sorting of sputum.

Fluorescence spectra were obtained from cells from sputum and pleural effusions stained with different fluorescent dyes and fixed by alternate methods. The spectra were referenced to a standard allowing for fluorescence comparisons of unstained and stained cells under various conditions. The metachromasia of acridine orange-stained cells offers nuclear/cytoplasmic differentiation in a single stain; mithramycin and propidium iodide do not. Unstained cells have an appreciable amount of green (546 nm) fluorescence, as does Carbowax in Saccomanno's preservative. Cytoplasm stained with acidine orange also has appreciable green fluorescence. Consequently, cells with much cytoplasm have high total fluorescence. Cytoplasmic fluorescence is negligible with mithramycin or propidium iodide. The metachromasia of acridine orange-stained cells is altered by alcohol and Carbowax levels in fixatives, keeping other factors constant.

Acridine Orange↗
PubMed1979

Automatic cell identification and enrichment in lung cancer. III. Light scatter and two fluorescence parameters.

Two fluorescence parameters and size are used in a flow through system to enrich sputum specimens for cancer cells. Human cells in sputum which are stained with acridine orange show a characteristic distribution of red and green fluorescence from which cancer cells can be localized. The peak enrichment is obtained by selectively sorting cells with the largest values of red and green fluorescence. Cancer cells located in other distribution regions having smaller fluorescence intensities show progressively diminished nuclear and cytoplasmic tinctorial features by Papanicolaou stain, consistent with the decreased intensity of red and green fluorescence.

Carcinoma, Squamous Cell↗
PubMed1979

Television microscopy for education and consultation in pathology via coaxial cable, laser beam, and COMSAT satellite.

In this article, the author describes how the closed circuit TV microscopy system used at The Johns Hopkins Medical Institutions facilitates discussion and diagnosis in consultation and promotes continuing education in, and out, of the institutions. The research, development, implementation, and use of this system at The Johns Hopkins Medical Institutions is supported in part by a grant from The William Penn Foundation and NCI contract NIH-NO1-CB-92172.

Education, Continuing↗
PubMed1978

Sister chromatid exchanges in the peripheral blood of cigarette smokers and in lung cancer patients; and the effect of chemotherapy.

Peripheral blood sister chromatid exchange (SCE) rates in chronic cigarette smokers and in subjects with cancer do not differ from those in healthy nonsmokers. SCE patterns were normal in 69 chronic cigarette smokers, including 62 patients with untreated lung cancer. In three chronic smokers with lung cancer, high SCE levels were related to recent intravenous chemotherapy.

Aged↗
PubMed1978

Cytologic detection and clinical significance of Actinomyces israelii in women using intrauterine contraceptive devices.

Pancervicovaginal (Papanicolaou) smears exhibiting pseudomycilial-like clumps of organisms obtained from 35 women employing IUD's were studied by direct immunofluorescent technique for identification of A. israelii and A. naeslundi. In every case the specific fluorescence was achieved with species-specific antiserum against A. israelii. The clinical profile of these 35 women was retrospectively analyzed.

Actinomyces↗
PubMed1978

Pelvic actinomycosis and the intrauterine contraceptive device. A cyto-histomorphologic study.

In 350 pancervico-vaginal (Fast) smears obtained from women using intrauterine contraceptive devices, organisms consistent with Actinomycetes have been found. Actinomycetes, representing cervicitis, endometritis, and pelvic abscesses clinically, have been observed histologically in some of these cases. Special stains, immunofluorescence, and anaerobic cultures have confirmed these organisms to be Actinomyces israelii. Actinomyces in the Fast smear occur in isolated clumps, revealing branching, filamentous organisms, and sulfur granules. They can be detected and diagnosed in a Papanicolaou-stained routine pancervico-vaginal smear. This diagnosis in Fast smears can identify users of intrauterine contraceptive devices who may have Actinomyces infection in the genital tract and who are at risk of developing clinical disease related to this infection.

Abscess↗
PubMed1976

New horizons in lung cancer diagnosis.

Lung cancer is rarely diagnosed and treated while still localized. Sputum cytology allows detection of radiologically occult tumors but conventional endoscopic procedures frequently prove inadequate for localization. It is the purpose of this report to outline the endoscopic observations and methods we have developed in successfully localizing 17 consecutive, radiologically occult carcinomas discovered in the sputum of 15 patients. A detailed examination of the upper respiratory tract demonstrated occult tumors in two patients. A segment by segment fiberbronchoscopic study under anesthesia allows multiple brushings and meticulous handling of specimens. Lesion localization is provided as well as identification of synchronous second primary tumors. Biopsies at the lobar spur and carina assist in determining the proximal extent of carcinoma in situ at potential surgical margins. Newer methods should enhance our recognition of inapparent carcinoma in situ allowing more efficient and more accurate tumor localization and a better appreciation of its extent.

Bronchi↗
PubMed1976

Relationships of morphology to clinical presentation in ten cases of early squamous cell carcinoma of the lung.

The morphologic changes in 10 patients who were found to have squamous cell carcinoma of the lung before they became evident on chest x ray are discussed. It is suggested that these cases have a long preclinical course as invasive carcinomas that ranges from a microscopic focus of microinvasion (possibly originating from in situ carcinoma in submucosal gland epithelium) to a large concentric carcinoma which may have metastasized to regional lymph nodes. Although the duration of the in situ phase of squamous cell carcinoma of the bronchus in not known, it was evident that the expanse of in situ carcinoma frequently far exceeded that of the invasive carcinoma, and usually extended proximal to the invasive lesion. It is important that the extent of the in situ lesion is determined preoperatively. Finally, multifocal in situ (or invasive) carcinoma was found in at least two of the cases, either synchronously or metachronously.

Adult↗