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Biomedical subjects

B Mason

Publications and source records attributed to B Mason.

At least 73 records · Page 4Linked to original sources
PubMed1988

Induction of antiidiotypic antibodies to donor HLA-A2 following blood transfusions in a highly sensitized HLA-A2+ recipient.

A patient (HLA-A2,3; B35,60) with end-stage renal disease and a high level of pretransfusion (t0) anti-HLA cytotoxic antibodies (60% positive to a random panel), but lacking cytotoxic antibodies against her HLA haploidentical sister (HLA-A2,3; B35,44), received 3 donor-specific transfusions (DST) from the latter: 200 cc fresh whole blood at biweekly intervals, while being treated with azathioprine (AZA, 1 mg/kg/day). Her serum remained negative for antidonor antibodies both by standard cytotoxicity assay and by immunofluorescence flow cytometry after DST + AZA treatment, and she experienced no acute rejection episodes following donor kidney transplantation. Microcytotoxicity inhibition tests were performed using standard HLA-typing sera as a source of Ab-1, and pre- and posttransfusion sera were added to serial dilutions of Ab-1 to test for the presence of Ab-2 (antiidiotype) to donor HLA class I specificities. Although both pre- and posttransfusion sera inhibited cytotoxicity toward HLA-A2 antigens expressed on recipient target cells, only posttransfusion serum was found to inhibit cytotoxicity against the HLA-A2 antigens expressed on donor target cells. Absorption of soluble HLA class I antigens present in pre- or posttransfusion sera removed the inhibition of cytotoxicity toward recipient HLA-A2 but did not affect the inhibition of cytotoxicity toward donor HLA-A2 by posttransfusion sera. The F(ab')2 fragment of the IgG fraction of posttransfusion sera contained the inhibitory activity, suggesting induction of Ab-2 toward idiotypes specific for donor HLA-A2 antigens encoded on the unshared haplotype.

Antibodies, Anti-Idiotypic↗
PubMed1987

Ultrasound-guided peritoneal oocyte and sperm transfer.

Peritoneal oocyte and sperm transfer (POST) was performed under ultrasound guidance and local anesthesia by the transabdominovesical route for a patient with unexplained infertility. This resulted in an intrauterine pregnancy confirmed by a raised beta-human chorionic gonadotropin (hCG) level and an ultrasound scan.

Female↗
PubMed1987

Studies on the measurement and pharmacodynamics of human follicle-stimulating hormone.

The levels of immunoreactive follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), cortisol, and estradiol (E2) have been determined in serial samples of peripheral plasma from four subjects during the continuous, subcutaneous administration of Buserelin (Hoechst [UK] Ltd., Hounslow, UK) (250 micrograms/day) and after the intramuscular injection of purified, urinary FSH (Metrodin, Serono Laboratories [UK] Ltd., Welwyn Garden City, UK) (150 IU). During Buserelin administration the geometric mean levels of FSH and LH as measured by immunoradiometric assay were reduced by 87% and 37%, respectively, when compared with the corresponding values for days 1 and 2 of the menstrual cycle. After the intramuscular injection of FSH, peak levels (from 3.4 to 6.2 IU/l) occurred in peripheral plasma between 6 and 18 hours later. The levels were significantly elevated after 72 hours (P less than 0.01, Student's paired t-test). There was no obvious effect of the drugs on the circadian rhythms of plasma PRL or cortisol, and no significant effect on the circulatory levels of LH or E2.

Adult↗
PubMed1987

A comparison of treatments with exogenous FSH to promote folliculogenesis in patients with quiescent ovaries due to the continued administration of an LH-RH agonist.

The circulating levels of plasma follicle-stimulating hormone (FSH), luteinizing hormone (LH) and oestradiol (E2) have been determined in three groups of three subjects during the continuous, subcutaneous administration of an LH-RH agonist (250 micrograms/day) and after the intramuscular injection of urinary FSH (group I, 150 IU daily for 8 days, total 1200 IU; group II, 300 IU on alternate days for four injections, total 1200 IU; and group III, 150 IU on alternate days for four injections, total 600 IU). The level of circulating FSH in group I rose steadily from a geometric mean of 1.11 (pre-injection) to 8.76 U/l (at day 8), while the corresponding levels in groups II and III fluctuated according to the time and dose of the injected material. Twenty-four hours after the injection the mean level of FSH in group II was significantly higher (7.31 U/l) than the corresponding value for group I (2.79 U/l) or group III (3.48 U/l). Only those subjects in group II showed a resumption of folliculogenesis (leading, mean maximum follicular diameters of 16, 13 and 14 mm, respectively) and a corresponding increase in the concentration of plasma E2 (from 22, 43 and 103 to 906, 1477 and 2362 pmol/l, respectively).

Adult↗
PubMed1986

Adrenocortical function and suicidal behavior in depressive disorders.

In order to examine the hypothesis that abnormal adrenocortical function is associated with suicidal behavior, morning and afternoon plasma cortisols and 1-mg dexamethasone suppression tests (DSTs) were performed in 65 patients with primary major depressive disorder. Patients with recent suicide attempts (within 28 days before DST) were compared to patients who had made past attempts and those who had never made suicide attempts with respect to age, gender, severity of depression, and plasma cortisol levels. Plasma cortisol levels did not differ significantly among the three groups. Nonsuppression on the DST was associated with presence of delusions, increasing age, and global severity of depression, but not with suicide attempts.

Adrenal Cortex↗
PubMed1986

Phase II trial of mitomycin, vindesine, and hexamethylmelamine in metastatic non-small cell bronchogenic carcinoma.

Mitomycin (10 mg/m2 iv on Day 1), vindesine (3 mg/m2 iv on Days 1 and 8), and hexamethylmelamine (100 mg/m2/day orally on Days 1-14) was administered to 32 patients with metastatic non-small cell bronchogenic carcinoma. No patient had been previously treated with chemotherapy and Eastern Cooperative Oncology Group (ECOG) performance status was 0-1 in 21 of 32 patients. Eleven partial responses (34%) were observed, with a median duration of 9 weeks. No complete responses were observed in this group of patients, whose median survival duration was 22 weeks. Moderate leukopenia (median leukocyte count nadir, 2500/mm3) was the major toxic effect. Although this regimen is active and relatively nontoxic, it will not be utilized in future ECOG trials because it has not produced an apparent improvement in survival duration.

Adult↗