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Biomedical subjects

J H Dean

Publications and source records attributed to J H Dean.

122 records · Page 7Linked to original sources
PubMed1975

Lymphocyte blastogenesis induced by potassium chloride extracts of allogeneic breast carcinoma and lymphoid cells.

Lymphocytes from cancer patients and normal individuals demonstrated blastogenesis with allogeneic potassium chloride (3 M KCl) extracts of breast carcinoma cells. Normal individuals reacted with a greater frequency and stronger blastogenic responses to tumor extracts than did breast carcinoma patients; allogeneic extracts may have elicited recognition of normal alloantigens rather than tumor-associated antigens. Normal individuals also responded to 3 M KCl extracts of allogeneic pooled normal leukocytes, normal breast tissue, and other cancers, but did not react to extracts of autologous leukocytes.

Antibody Specificity↗
PubMed1975

Inhibition of leukocyte migration by tumor-associated antigens in soluble extracts of human malignant melanoma.

Direct leukocyte migration inhibition (LMI) assays were performed to investigate whether cell-mediated immune reactions could be detected in response to tumor-associated antigens of human melanoma. The antigens were 3 M KCl-soluble extracts of different fresh melanomas, other cancers, and benign nevus tissue. A total of 48 of the 79 (61%) blood samples from melanoma patients (64 patients) reacted with extracts of melanoma tissue. Since the subjects were usually tested with two or three extracts, 57/134 (42%) tests with melanoma patients' leukocytes were inhibited by KCl extracts of melanoma tissue, whereas only 3/50 (6%) tests with leukocytes of normal donors and 4/27 (15%) with patients having other cancers gave positive results. No positive reactions were obtained when 13 melanoma patients were tested with a 3 M KCl extract of benign nevus tissue. Likewise, only 2/26 (8%) positive tests were obtained from melanoma patients tested with extracts of other cancers. Individuals in all stages of disease had similar incidences of positive reactions to the soluble melanoma extracts, except for patients with stage-1 disease who exhibited a somewhat higher incidence of reactivity. The highest incidence of reactivity was observed in patients before surgical resection of the tumor, and somewhat decreased reactivity was seen 0-14 days post surgery. The results indicate that the direct LMI assay may be used to measure cell immune reactivity against melanoma-associated antigens. Since many of the positive results were obtained with allogeneic extracts, the results also indicate that different melanomas possess common antigens.

Adult↗
PubMed1975

In vitro human reactivity to staphylococcal phage lysate.

The cell-mediated reactivity of normal individuals to staphylococcal phage lysate (SPL) were tested in vitro in the lymphocyte stimulation (LS) and leukocyte migration inhibition (LMI) assays. There were 95% positive responses in LS (stimulation ratio larger than or equal to 3 with p less than 0.01) and 67% positive responses in LMI (migration index less than or equal to 0.80). Enriched subpopulations of T and B lymphocytes were prepared with rosette formation and density gradient centrifugation. SPL stimulated lymphoproliferative responses in both T and B cell subpopulations whereas phytohemagglutinin (PHA) stimulated only the T cell subpopulation. Cord blood leukocytes were tested in the LS assay and 41% gave positive responses to SPL, 81% to PHA, and 17% with SLO. SPL appears to be a useful reagent for the in vitro study of cell-mediated reactivity, and may provide somewhat different information from that obtained with other mitogens or antigens.

Antigens, Bacterial↗
PubMed1975

Functional activities of rosette separated human peripheral blood leukocytes.

Subpopulations of human peripheral blood leukocytes were isolated by rosette formation and tested for functional activity. E -rosette-forming cells (E-RFC) and EAC-RFC were separated from non-resetting cells by sedimentation on Ficoll-Hypaque gradients. The efficiency of the method and the purity of the resulting subpopulations were high. E-RFC responded to PHA Con A, allogeneic leukocytes, and PPD, with higher levels of proliferative reactivity than the unseparated lymphocytes while E-RFC depleted, EAC-RFC, and null cells showed only low levels of reactivity. Reactivity to PWM and tetanus toxoid was also restricted to the E-RFC subpopulation, but was lower than that of unseparated cells. A staphylococcal antigen preparation triggered lymphoproliferative reactivity in the E-RFC, E-RFC depleted, EAC-RFC, and the null cell subpopulations. 51Cr release lymphocyte cytotoxicity against a human lymphoblast target cell line was found in the E-RFC and null cell fractions but was not observed with the EAC-RFC subpopulation.

Cell Separation↗
PubMedDate not supplied

Fragile X syndrome: growth, development, and intellectual function.

We collected data on growth, psychomotor development, speech and language development, and intellectual function on a cohort of 100 males with the fragile X chromosome and 95 carrier females. The data include information on prenatal growth (33 males), growth during the preadult years (32 males), psychomotor development during the first 2 years (25 males), speech and language development (15 males and 5 females), and intellectual function (93 males, 33 females, and 10 obligate carriers who were cytogenetically normal). Birth measurements appeared normal when plotted on the Usher/McLean curves of newborn infants (mean head circumference - OFC - at 40th centile, length at 60th centile and weight at 55th centile). Following birth, OFC rose above the 50th percentile and continued above average throughout the preadult years, whereas average length was above average for the first 5 years only and weight did not deviate from the normal mean. Psychomotor development lagged behind the norm from birth with affected males requiring nearly twice as long as expected to sit alone, walk unassisted, and say first words clearly. All males and females studied had significant language delay; all except one male had abnormalities of articulation. All on whom a clear voice sample was obtained had low voice pitch, and 80% had a hoarse or harsh quality of voice. Five males had word repetitions or perseverative speech during the preadult years. The mean IQ of the 93 males studied was 33 and regression analysis demonstrated a decrease in intellectual performance with age. Four fifths of the female carriers who expressed the fra(X) had intellectual performance in the mentally retarded range and showed similar decrease in performance with age. Obligate female carriers who did not express the fra(X) site had normal IQs (IQ 102 +/- 13.3).

Adolescent↗