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Biomedical subjects

W Ray

Publications and source records attributed to W Ray.

5 recordsLinked to original sources
PubMed1992

Developmental changes in hepatic basolateral membrane lipid composition and fluidity.

Membrane fluidity and lipid composition influence the activity of a variety of membrane proteins. Decreased rates of hepatic ion clearance are associated with the neonatal period. We postulated that hepatic basolateral membranes derived from suckling animals might be less fluid than those from adult animals. Basolateral membrane vesicles were prepared from the livers of 1-week-old (SBLMV) and adult (ABLMV) rats by a Percoll gradient method. Na+/K(+)-ATPase activities were similar in the two groups. Double bond index, cholesterol and cholesterol/phosphorus ratios were significantly higher in SBLMV compared with ABLMV, while lipid phosphorus and relative percentages of phospholipid subclasses did not differ. Fluorescence anisotropy measured using diphenylhexatriene as well as 2-(9-anthroyloxy)stearate was significantly greater in SBLMV compared with ABLMV, while measurements made with 12-(9-anthroyloxy)stearate were similar in both age groups. Mean excited state lifetimes, lifetime distributions, and rotational correlation times were similar in both groups. These data suggest that hepatic basolateral membranes derived from suckling rats are less fluid than those from adult animals and further suggest that this difference may be due to increased cholesterol in hepatic basolateral membranes derived from suckling animals.

Animals↗
PubMed1988

Nephrotoxicity in leukemic patients receiving empirical amphotericin B and aminoglycosides.

Twelve leukemic patients (19%) receiving amphotericin B and aminoglycosides had nephrotoxicity (creatinine value greater than 2.0 mg/dl). Patients with nephrotoxicity tended to be older than patients without nephrotoxicity; gender and total amphotericin B dose were not related to nephrotoxicity. Sodium administration has previously been shown to reverse amphotericin B nephrotoxicity. In this series, among patients receiving ticarcillin at greater than or equal to 18 gm/day (93.6 mEq of sodium per day) the incidence of nephrotoxicity was significantly decreased (1/30, or 3.3%). A multivariate analysis showed that this protective effect of ticarcillin was not dependent on the fact that patients receiving ticarcillin were less likely to receive vancomycin. There were insufficient patients receiving sodium in the absence of ticarcillin to study the effect of sodium alone. However, our observations are consistent with the hypothesis that sodium can prevent renal dysfunction in this clinical situation.

Adult↗
PubMed1987

Malignant lymphomas of follicular center cell origin in man. VI. Large cleaved cell lymphoma.

Between 1970 and 1986 61 patients with large cleaved cell lymphoma (LCCL) were observed and treated. Median age was 56, and there were slightly more women than men (ratio, 1.4:1). Forty-four cases (72%) had both a nodular and diffuse pattern; eight cases were nodular; nine cases were diffuse. Forty-three patients (70%) had Stage III or IV disease; four patients were Stage I (7%); 14 were Stage II (23%). Bone marrow was involved in 15 of 56 evaluable patients (27%). The median survival was 57 months. It was significantly shorter in symptomatic patients (median, 20 months) than in asymptomatic patients (median, 66 months; P = 0.002). Survival time was also shorter in Stage III and IV patients (median, 46 months) compared with Stage I and II patients (median, 100+ months; P = 0.032). Survival was independent of the disease pattern, marrow involvement, age, gender, and surface immunoglobulin heavy or light chain. Among Stage III and IV patients, survival was the same in patients who received therapy initially and in those who were treated expectantly. Among 10 advanced-stage patients who did not initially receive therapy, the median time to beginning therapy was 17 months; five patients received no therapy for 40 to 96 months. Among 14 advanced-stage patients receiving therapy regarded as curative in aggressive lymphoma, 50% experienced a complete remission (CR). However, unlike other aggressive large cell lymphomas, long-term, relapse-free survival was observed in only 9% of patients as the majority of CRs were associated with relapse rather than cure. Despite the fact that it is a large cell lymphoma, LCCL is best regarded as an indolent lymphoma.

Adult↗