Comparison of effects of tiapride and sulpiride on D-1, D-2, D-3 and D-4 subtypes of dopamine receptors in rat striatal and bovine caudate nucleus membranes.

To determine the affinity of tiapride to D-1, D-2, D-3 and D-4 subtypes of dopamine (DA) receptors, inhibitory effects of tiapride on [3H]-cis-flupenthixol, [3H]spiperone and [3H]N-propylapomorphine binding were examined in the rat striatum and bovine caudate nucleus membranes and compared to those of sulpiride and haloperidol. The IC50 values of tiapride, sulpiride and haloperidol were estimated as follows: 1440, 132 and 0.295 microM for D-1; 45.

Effects of zotepine, chlorpromazine and haloperidol on D-1, D-2, D-3 and D-4 subtypes of dopamine receptors in rat striatal and bovine caudate nucleus membranes.

Inhibitory effects of zotepine (Zot) on D-1, D-2, D-3 and D-4 subtypes of dopamine (DA) receptors were investigated in crude synaptic membranes of rat striatum and bovine caudate nucleus and compared to those of chlorpromazine (CPZ) and haloperidol (HAL). From the IC(50)-values of Zot, CPZ and HAL, the K-values of each drug are estimated as follows: 34.4, 152 and 244 nM (D-1, (3)H-labeled cis-flupenthixol binding (1.

Structural similarities between kinocilium of vestibular hair cell and tracheal motile cilium in the guinea pig.

A rapid-freeze, deep-etch method was used to visualize the membrane characteristics as well as the three-dimensional ultrastructural features of a kinocilium of the guinea pig vestibular hair cell. A kinocilium of the vestibular hair cell had a typical ciliary necklace, consisting of six to seven parallel intramembrane particle arrays. The basal body of a kinocilium had a plate-structure called a terminal plate, in its interior.

Cytoskeletal organization in the supporting cell of the guinea pig organ of Corti.

The rapid-freeze, deep-etch method was used to visualize the three-dimensional organization of cytoskeletons in the supporting cells of the guinea pig organ of Corti. Deep-etched replicas showed that both the head and basal portions of the pillar cell were composed of a filamentous network consisting of several kinds of fibrous elements, into which numerous microtubules and actin filaments were tightly inserted. Myosin S1-decoration showed that the main constituent element in such filamentous networks in the basal portion of the pillar cell was the actin and tiny cross-bridges interconnected the randomly oriented adjacent actin filaments.

Human hepatocellular carcinoma-associated changes of glycosphingolipids detected by two monoclonal antibodies FH2 and IB9.

The changes of minor glycosphingolipids associated with human hepatocellular carcinomas were studied using monoclonal antibodies. Glycosphingolipids of twelve patients were isolated from the tumor tissues and their adjacent cirrhotic liver tissues. The immunoreactivities of glycosphingolipids with two monoclonal antibodies FH2 and IB9, that define x-structure (Gal beta 1-4[Fuc alpha 1-3]GlcNAc) and sialosyl alpha 2-6galactosyl residue, respectively, were studied by a solid phase enzyme-linked immunosorbent assay and a chromatogram immunobinding assay.

Three-dimensional visualization of basal body structures and some cytoskeletal components in the apical zone of tracheal ciliated cells.

The ciliated cells of tracheal epithelium were mechanically fragmented to remove the cytoplasmic soluble contents, and the apical zone was examined to clarify the three-dimensional structures of basal body and cytoskeletal filaments using freeze-fracture-etch approaches. The basal body was connected to the apical plasma membrane by definite laminae, formerly called alar sheets. The distal one-half of the basal foot was composed of several smooth-surfaced 12-nm fibrils.

Structural features of the basal lamina in Reissner's membrane of the guinea pig.

The structural features of the basal lamina in Reissner's membrane were examined electron microscopically using tannic acid fixation, poly-cationic staining (ruthenium red), and mono-cationic staining (safranin O). Tannic acid fixation revealed 5-10-nm filaments which ran perpendicularly between the lamina densa and the cytoplasmic surface of squamous epithelial cells. Ruthenium red staining showed a lattice-like arrangement of anionic sites on both sides of the lamina densa.

Human hepatocellular carcinoma is associated with quantitative and qualitative changes in glycolipids.

Changes of glycolipids in the naturally occurring human hepatocellular carcinoma tissues were studied. Neutral glycolipids (two fractions) and gangliosides from human hepatocellular carcinoma tissues and their adjacent uninvolved liver tissues from ten patients were purified and analyzed by high-performance thin-layer chromatography. Human hepatocellular carcinoma was shown to be associated with the extensive changes of the thin-layer chromatography patterns of both neutral glycolipids and gangliosides.

Solid-phase radiolabeling of glycolipids with galactose oxidase and sodium boro[3H]hydride.

Neutral glycosphingolipids immobilized on plastic surfaces were specifically radiolabeled with the galactose oxidase-sodium boro[3H]hydride method. Glycolipids could be immobilized in the absence of any other lipids such as phosphatidylcholine and cholesterol. Rather, the presence of these lipid components decreased the efficiency of radiolabeling.

Squamous cell papilloma of the esophagus in a child.

The case of a 17 month-old girl with an esophageal squamous cell papilloma is presented. There was a previous history of intermittent hematemesis and vomiting. The tumors were located in the lower esophagus and were removed operatively.

Three-dimensional features of the striated organelle in the vestibular hair cell.

The striated organelle, the Friedmann's body, of the vestibular hair cells in normal guinea pigs were examined using a freeze-fracture-etch technique. The striated organelles were composed of periodic parallel loose spirals of two fine fibrils, the thick strands. This main distance was divided by thin strands, and many fine fibrils cross-linked the thick strands to the central thin strands.

High-dose chemotherapy with frozen autologous marrow transplantation in patients with poor-prognosis tumors.

One hundred and ninety patients with poor-prognosis tumors, mainly advanced solid cancers were treated with a first course of high-dose chemotherapy. One hundred nine of them received frozen autologous bone marrow transplantation (FABMT) a total of 160 times. Thirty-four of the 109 patients were given a second course, and five of the 34 received a third course followed by FABMT.

A deep-etching study of the guinea pig tracheal cilium with special reference to the ciliary transitional region.

The fine structure of the cilium was examined by freeze-fracture-etch studies. In the interior of the transitional region, three types of plate structures were clearly observed. While the terminal plate contained fine fibrillar linkers suspending the central core plates from its peripheral doublet microtubules, two other types of plates had no suspending linkers.

Double-axis rotary replication for deep-etching.

We have developed a simple new method of rotary shadowing, double-axis rotary replication, for observing three-dimensional structures in deep-etched, rapid-frozen tissues. The technical details of this method are described and compared with the conventional fixed-angle rotary shadowing procedure.

Dynamics of swallowing in tetanus.

An 82-year-old man developed an uncommon type of swallowing disturbance with tetanus. Initially, he could masticate his food but could not pass it into the esophagus. The mechanism of swallowing in this patient was studied radiologically and endoscopically.

Regular structures on the microvillar surface membrane of ileal epithelial cells in suckling rat intestine.

Freeze-fracture deep-etch studies were done to examine regular patterns of surface membrane particles in the suckling rat ileal epithelium by using quick-freezing method. In addition to the presence on the luminal surfaces of well-developed endocytic complexes, latticed particles were consistently observed on almost the entire apical membrane between microvilli and frequently on the microvilli. These particles seemed to be partly integrated in the outer half layer of membranes.