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Biomedical subjects

A Perini

Publications and source records attributed to A Perini.

At least 37 records · Page 2Linked to original sources
PubMed1987

Increased levels of soluble interleukin-2 receptor in the serum of patients with human immunodeficiency virus infection.

The serum levels of a soluble form of the interleukin-2 receptor (sIL-2R) were investigated in 92 patients with human immunodeficiency virus (HIV) infection, ranging from asymptomatic cases to full-blown AIDS. Increased values were found in 69.5% of cases. The overall mean was significantly higher (p less than 0.001) in HIV-infected patients (mean +/- SD = 709.3 +/- 369.4 U/ml) than in the seronegative risk group controls (383.9 +/- 140.5) and normal controls (256.4 +/- 114.5). No major differences were found among the patient groups (asymptomatic infection, persistent generalized lymphadenopathy, symptomatic infection, and full-blown AIDS). These data suggest that the measurement of serum sIL-2R levels may represent a useful biological tool for evaluating T-cell activation phenomena occurring in HIV infection. Since the soluble interleukin-2 receptor maintains the capacity of binding interleukin-2, the increased levels found in HIV infection may play a contributory role towards the in vitro and in vivo impairment of a number of interleukin-2-dependent functions described in this disease. On clinical grounds, the excess of sIL-2R could help to explain the lack of therapeutic effect and little immunological variations following the in vivo administration of interleukin-2.

Acquired Immunodeficiency Syndrome↗
PubMed1986

Antigenic competition in IgE antibody production. III. Suppressive effect on Th and B cells.

An adoptive cell transfer system was utilized to evaluate the site of action of the suppressive mechanism involved in antigenic competition in IgE antibody production. Carrier-primed (OA) and hapten-primed (DNP-KLH) spleen cells were transferred to syngeneic irradiated recipients that were challenged with a heterologous conjugate (DNP-OA). To study the effect of antigenic competition on T and B cells, donor mice of one or the other cell type received in addition the competitor antigen (Asc) at immunization. The adoptive secondary IgE anti-DNP antibody response was suppressed in both situations. This effect could not be attributed to transfer of Asc-primed cells. Irradiation of donor mice before immunization with the two antigens abrogated the suppressive effect. These results indicate that both Th and B cells primed to the test antigen were affected by antigenic competition.

Animals↗
PubMed1984

Gram-negative septicemia in patients with hematologic malignancies.

The clinical records of 66 consecutive episodes of Gram-negative bacteremia occurring in 60 patients with hematologic malignancies during a 66-month period were reviewed to assess the major prognostic factors. The bacteremia-related mortality was 53%. Overall, Pseudomonas aeruginosa (54%) and Escherichia coli (24%) were the predominant isolates (fatality rate 78 and 31% respectively). The majority of patients (58/66) were granulocytopenic (PMN less than 1000/microliters). Among the 18 patients whose circulating granulocytes increased by one log10 or to above 1000/mmc during therapy, the fatality rate was 39%, as opposed to 70% in the 40 patients without such an increase. Pneumonia-associated bacteremia (56%) had a high fatality rate (73%) compared to isolated bacteremias (27%). Septic shock and inappropriate antibiotic therapy accounted for the highest mortality. Our data suggest that Pseudomonas etiology, persistent neutropenia, associated pneumonia, septic shock and inappropriate antibiotic therapy account for a bad prognosis in Gram-negative bacteremia in hematologic malignancies.

Agranulocytosis↗
PubMed1983

Homocytotropic and heterocytotropic activity of mouse IgG1 antibodies.

Mouse anti-ovalbumin antibodies were isolated by affinity chromatography and fractionated in a column of protein A-Sepharose. Three peaks were obtained: peak I that did not bind to protein A, peak II eluted with 0.5 M NaSCN and peak III eluted with 2.0 M NaSCN. Peak I and peak II contained IgG1 but no detectable IgG2 or IgG3, whereas peak II contained IgG2 and IgG3 but no detectable IgG1. Peak I, but not peak II, showed heat-resistant passive cutaneous anaphylactic (PCA) activity in rats, which was absorbed by anti-IgG1 serum but not by anti-IgE. Both peak I and peak II showed heat-resistant PCA activity in mice, that was absorbed by anti-IgG1. Peak III showed PCA activity in guinea pigs but not in mice or rats. These findings suggest that mouse IgG1 can be divided into 2 populations that differ in physicochemical and biological properties.

Animals↗
PubMed1983

Bone marrow evaluation: the relative merits of particle sections and smear preparations.

Bone marrow aspirates (311) from patients with various haematologic disorders were examined with both smear preparations and histologic sections. Adequate specimens for comparison were obtained in 77.4%. A wide discrepancy concerning the cellularity was noted between the two methods. The results confirm previous studies and indicate that histologic examination of bone marrow aspirates is particularly helpful in lymphoproliferative disorders. It is concluded that sectioning of aspirated marrow is an important procedure and should be included in the routine examination of bone marrow.

Biopsy, Needle↗
PubMed1982

Two biologically different mouse IgG1 antibodies.

Isolated mouse antibodies were submitted to affinity chromatography with protein A. Three peaks were obtained: peak I that did not bind to protein A, peak II eluted with 0.5 M NaSCN and peak III eluted with 2.0 M NaSCN. Peak I and peak II contained IgG1 but no detectable IgG2 or IgG3, whereas peak III contained IgG2 and IgG3 but no detectable IgG1. Peak I, but not peak II, showed heat-resistant passive cutaneous anaphylactic (PCA) activity in rats which was absorbed by anti-IgG1 antiserum but not by anti-IgE. Both peak I and peak II showed heat-resistant PCA activity in mice, that was absorbed by anti-IgG1 serum. Peak III showed PCA activity in guinea pigs but not in mice or rats. These findings suggest that mouse IgG1 can be divided into 2 populations that differ in their affinity for protein A and in their PCA activity.

Animals↗
PubMed1980

[The use of betamethasone in polychemotherapy of lymphoproliferative diseases].

In recent years very encouraging results have been obtained in the treatment of lymphoproliferative disorders with the use of combination chemotherapy regimens. We have treated with protocols including betamethasone 29 patients with Hodgkin's disease, 33 affected by non-Hodgkin's lymphomas, 29 with chronic lymphocytic leukemia, 7 with acute lymphoblastic leukemia and 9 patients affected by multiple myeloma. Results have been very satisfactory in patients with advanced stage Hodgkin's disease (67% complete remission), in high malignancy non Hodgkin's lymphomas (47% complete remission) and in acute lymphoblastic leukemia (100% of patients in complete remission). Our results suggest that the use of betamethasone as a part of combination chemotherapy regimens may be very useful in the treatment of lymphoproliferative disorders.

Adolescent↗
PubMed1978

[Clinical and pathological staging of 85 patients with Hodgkin's disease: a clinical contribution (author's transl)].

This is a retrospective study of 85 patients with Hodgkin's disease undergoing studies of clinical staging. Of these, 28 were investigated by laparotomic splenectomy, which revealed evidence of disease progress not otherwise detectable in 10 cases (36%). The authors also note that cases with an unfavorable histotype are associated with a higher incidence of spleen involvement and a more advanced stage of disease.

Adult↗
PubMed1976

[Effect of diazoxide on blood pressure, PRA and plasma aldosterone in hypertensive patients (author's transl)].

Intravenous diazoxide (300 mg) was administered to 29 hypertensive patients previously classified in subgroups according to their plasma renin and urinary aldosterone levels. The blood pressure was measured before and periodically after injection and plasma renin activity (PRA) and plasma aldosterone before and after 2 hours. The mean systolic and diastolic blood pressure fell notably from 193/118 to 155 93 mmHg; whereas PRA increased from 7.51 to 13.21 ng/ml/3 hrs and plasma aldosterone did not change significantly (71.3 and 102.8 ng%). Examining the individual sub-groups, a significant decrease in blood pressure was observed in 15 patients with low, posture unresponsive PRA, both in subjects with normal urinary aldosterone and those with surgically proven primary aldosteronism. In the former only the mean PRA showed a slight but sigificant increase, while in the latter the changes for both PRA and aldosterone were not significant. In the subgroups of patients with normal renin and urinary aldosterone the arterial pressure also significantly and promptly decreased. However, in this group the mean PRA substantially increased whereas the plasma aldosterone levels remained constant. The same blood pressure decline was observed in those patients with high PRA and aldosterone, including 1 case of pheocromocytoma. The mean PRA showed a further modest increase while the plasma aldosterone did not change significantly. These results indicate that the antihypertensive action of diazoxide is similar in the different types of hypertension (volume, vasoconstrictor or mixed form according to Laragh's classification), being independent of the basal plasma renin and aldosterone levels. Furthermore, the response of the blood pressure to diazoxide is not related in any way to the induced changes in PRA and plasma aldosterone values.

Adrenal Gland Neoplasms↗
PubMed1975

The effect of a synthetic double-stranded RNA on IgC1 and IgE production by guinea-pigs. A comparative study with lipopolysaccharide.

The effect of synthetic complexes of polyribocytidylic acid (poly-IC) on the production of homocytotropic antibodies by guinea-pigs was studied. It was observed that poly-IC has a definite adjuvant effect on the production of both IgG1 and IgE. The adjuvant effect was present when poly-IC was injected 24 hours after the antigen, but was absent when the polynucleotide was injected 48 hours after the antigen. In comparison with lipopolysaccharide (LPS) the adjuvant effect of poly-IC was weaker, more than 0.5 mg/kg of this polynucleotide being required to show an adjuvant effect, whereas only 20 mug/kg of LPS was enough to show a positive adjuvant effect. Furthermore, considerably less antibody was detected in the animals stimulated with the polynucleotide.

Adjuvants, Immunologic↗