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Biomedical subjects

D Graham

Publications and source records attributed to D Graham.

At least 217 records · Page 12Linked to original sources
PubMed1982

Identification of polypeptides associated with a putative neuronal nicotinic acetylcholine receptor.

Polypeptides involved in the binding of the nicotinic acetylcholine receptor ligand alpha-bungarotoxin (Mr = 8,000) to neuronal membranes were identified by three independent methods: (i) 125I-alpha-bungarotoxin bound to membrane fractions or to monolayer cultures of chick retina was cross-linked to its binding site by using glutaraldehyde, or the photoactivatable bifunctional reagent N-succinimidyl-6-(4'-azido-2'-nitrophenylamino)hexanoate. Electrophoretic analysis of the cross-linked membrane proteins revealed 125I-alpha-bungarotoxin-polypeptide adducts of apparent Mr = 63,000, 43,000, and 33,000. (ii) Affinity purification of the alpha-bungarotoxin binding protein from detergent extracts of [35S]methionine-labeled retina cultures identified one major polypeptide with an Mr = 57,000. (iii) Indirect immunoprecipitation from detergent extracts of [35S]methionine-labeled rat pheochromocytoma cells (PC 12) gave evidence for a specific co-precipitation of alpha-bungarotoxin with three polypeptides (Mr = 57,000, 34,000, and 25,000). The data suggest that polypeptides of Mr - 57,000, 35,000, and 25,000 (+/- 3,000) are located at or close to the alpha-bungarotoxin binding domain of the putative neuronal nicotinic acetylcholine receptor.

Animals↗
PubMed1982

Purification by affinity chromatography of the glycine receptor of rat spinal cord.

The glycine receptor of rat spinal cord was solubilized with the nonionic detergent Triton X-100 and subsequently purified by affinity chromatography on aminostrychnine-agarose and wheat germ agglutinin-Sepharose. An overall purification of 1950-fold was achieved. Polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate and mercaptoethanol revealed three glycine receptor-associated polypeptides of Mr = 48,000, 58,000, and 93,000. [3H]Strychnine was incorporated irreversibly into the Mr = 48,000 polypeptide upon UV-illumination. The dissociation constant (KD) of [3H]strychnine binding to the purified glycine receptor was 9.3 +/- 0.6 nM. The glycine receptor agonists glycine, beta-alanine, and taurine inhibited the binding of [3H]strychnine to the purified receptor. Gel filtration and sedimentation in sucrose/H2O and sucrose/D2O gradients gave a Stokes radius of 7.7 nm, a partial specific volume of 0.780 +/- 0.005 ml/g and a sedimentation coefficient s20,w of 8.2 +/- 0.2 S for the purified glycine receptor. From these data, a molecular weight of 246,000 +/- 6,000 was calculated for the glycine receptor protein.

Affinity Labels↗
PubMed1982

Avermectin B1a inhibits the binding of strychnine to the glycine receptor of rat spinal cord.

The anthelmintic drug, avermectin B1a, has been reported to interfere with gamma-aminobutyric acid-mediated chloride conductance. Also, enhancement of diazepam binding to mammalian brain membranes by avermectin B1a has led to the suggestion that avermectin B1a interacts with the 'benzodiazepine receptor-gamma-aminobutyric acid receptor-chloride ionophore' complex. Here we report an interaction of avermectin B1a with the glycine receptor. The binding of the glycine receptor antagonist, strychnine, to both membranes and solubilized receptor from rat spinal cord, was inhibited by avermectin B1a with Ki values of 1.3 microM and 3.6 microM, and Hill coefficients of 0.46 and 0.62, respectively.

Animals↗
PubMed1982

Amniotic fluid.

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Amniocentesis↗
PubMed1982

Sonographic findings in abdominal pregnancy.

The sonographic findings in four cases of abdominal pregnancy are described and compared with similar cases reported in the literature. The findings include demonstration of an empty uterus adjacent to the bladder, absence of myometrium around the fetus, unusual fetal lie, poor definition of the placenta, and relative oligohydramnios.

Adult↗
PubMed1982

Uterine rupture occurring during midtrimester abortion.

Uterine rupture is an uncommon complication of midtrimester abortion, occurring more frequently in the older multiparous patient and with the use of high doses of oxytocic agents. The clinical presentation may vary from an unexplained drop in the hematocrit or persistent abdominal pain to profound shock and maternal death. There is often considerable delay in diagnosis and subsequent treatment. The clinical presentation of a patient who sustained uterine rupture during midtrimester abortion is described and the possible etiology, clinical presentation, and management of this condition are described. It is recommended that older multiparous patients receiving oxytocic agents be monitored closely to prevent uterine hyperstimulation and that prompt laparotomy be performed when the diagnosis of uterine rupture is made.

Abortion, Induced↗
PubMed1981

Catheter management programs and postoperative urinary dysfunction.

This study was designed to compare the effectiveness of two approaches to urinary catheter management in controlling postoperative urinary dysfunction in 110 patients following abdominoperineal resection or low anterior bowel resection. Patients, stratified by sex and surgical procedure, were randomly assigned to either straight gravity drainage or a 6-day progressive catheter clamping program. The bladder training program following abdominoperineal resection reduced significantly the urinary dysfunction rate in women but not in men. Marked differences in dysfunction rates were related to type of surgery, gender, and surgeon. Etiology of postoperative voiding dysfunction in various groups is discussed.

Adult↗