Ultrastructural findings in clinically uninvolved oral mucosa of patients with HIV infection

Twelve biopsies of clinically normal oral mucosa taken from HIV seropositive patients have been investigated by means of light- and electron microscopy. Vascular abnormalities were found in all biopsies, regardless of the clinical stage of the HIV infection. In particular slit-like vascular channels, sparseness of intercellular junctions and swollen, protruded endothelial cells with an increased quantity of Weibel-Palade bodies were noticed. These findings were similar to those described in lesions of early stage Kaposi's sarcoma.

In vitro binding of progesterone, cronolone and medroxyprogesterone acetate to uterine progesterone receptors of sheep, rabbit and mouse

Various aspects of the binding of the synthetic progesteongens, cronolone (9 alpha-fluoro-11 beta-hydroxy-17 alpha-acetoxypregn-4-ene-3,20-dione) and medroxyprogesterone acetate (6 alpha-methyl-17 alpha-acetoxypregn-4-ene-3,20-dione, MAP) to uterine cytosol progesterone receptors of the sheep, rabbit and mouse were studied, in an attempt to explain interesting species differences in the biological activity of these steroids. For the sheep, data for binding-site concentration, relative binding affinity (RBA), dissociation constant (Kd) and rates of association and dissociation indicate specific binding of cronolone to the progesterone receptor and these would seem to explain in part the high progestational activity of cronolone in this species. By contrast, with the mouse, there was only a low level of specific binding of cronolone and this appears to explain its inability to maintain pregnancy in this species. Results for the binding activity of cronolone in rabbit uterus were similar to those for the sheep and thus inability of cronolone to maintain pregnancy in the rabbit is not explained by a failure to bind the progesterone receptor. Species differences in binding to the progesterone receptor were also seen with MAP where the RBA, with respect to progesterone, was high in the sheep and rabbit and lower in the mouse. The results, however, do not relate directly to the progestational activity of MAP in these species. Overall, the data indicate that species differences in the binding activity of steroid receptors constitute one factor that causes species-dependent variation in biological responses to progestogens.

Some biological activities of cronolone and medroxyprogesterone acetate in the uterus of the sheep, mouse and rabbit

Cronolone (9 alpha-fluoro-11 beta-hydroxy-17 alpha-acetoxypregn-4-ene-3,20-dione) is widely employed to regulate breeding activity in the ewe, but its biological activity in the uterus of this and most other species has not been studied. In this study several in vivo uterus-related activities of cronolone have been examined in the sheep, mouse and rabbit. In some experiments the corresponding activities of medroxyprogesterone acetate (6 alpha-methyl-17 alpha-acetoxypregn-4-ene-3,20-dione, MAP) were also examined. Cronolone maintained pregnancy in ovariectomized ewes but not in ovariectomized mice and rabbits; it terminated pregnancy in some mice and in all rabbits that were receiving daily progesterone treatment. Cronolone could not sensitize the mouse uterus for the induction of the decidual-cell reaction or block the induction of such sensitivity by progesterone, but did support limited growth of the oil-stimulated horn after sensitization with progesterone. Cronolone induced uteroglobin secretion by rabbit endometrium. It was concluded that, whereas MAP is a potent progestogen in the sheep, mouse and rabbit, cronolone is a progestogen in the sheep and rabbit only. In the mouse and especially the rabbit, cronolone has other, non-progestational activities, which block pregnancy.

Serotonin-like immunoreactive fibers in the medial dorsal accessory group and the anterior fornical nucleus of the magnocellular neurosecretory system in the rat

The area lateral to the stria medullaris and the fornix at the level of the interventricular foramen, an area known to be occupied by the medial dorsal accessory group and the anterior fornical nucleus of the magnocellular neurosecretory system, was found to be studded with serotonin (5-HT)-like immunoreactive (LI) varicosities. Double immunostaining with antisera against 5-HT and oxytocin (OXY) proved that the 5-HT-LI varicosities were in close proximity to the OXY-LI neurons in the medial dorsal accessory group and the anterior fornical nucleus. These nuclei were distributed more densely with 5-HT-LI varicosities than other cell groups in the magnocellular neurosecretory system.

Depressor and bradycardic effects induced by spinal subarachnoid injection of D-Ala2-D-Leu5-enkephalin in rats

The effects of D-Ala2-D-Leu5-enkephalin (DADLE), a specific delta receptor agonist, on spinal control of cardiovascular function, were investigated by its intrathecal (i.th) injection into the spinal subarachnoid space at the T-9 level. In chloralose-anesthetized rats, DADLE (17.5, 35 and 70 nmol, i.th) caused dose-dependent hypotension and bradycardia. The mean maximal hypotension by 70 nmol of DADLE was -45 +/- 7 mmHg, with a bradycardia of -79 +/- 15 beats/min. These inhibitory cardiovascular effects were antagonized by the opiate antagonist naloxone (50 nmol, i.th.) given prior to DADLE. Intrathecal injection of DADLE also decreased splanchnic sympathetic nerve discharge (-46 +/- 5%). DADLE (70 nmol) given i.v. did not cause significant changes in mean arterial pressure (MAP) and heart rate (HR). Neither bilateral vagotomy nor pretreatment with atropine (0.2 mg/kg, i.v.) prevented the BP and HR effects of intrathecal injection of DADLE at a dose of 35 nmol. DADLE at this dose failed to produce significant alteration in the frequency of respiration and blood PaO2, PaCO2 and blood pH. In conscious rats, 140 nmol of DADLE (i.th.) did not produce any consistent changes in MAP and HR. These data suggest that intrathecal injection of DADLE inhibits central sympathetic activity, possibly at a spinal locus.

The second national growth and development survey of children in China, 1985: children 0 to 7 years

To evaluate the normal physical growth and development of Chinese children and to compare the nutritional status of today with that of ten years ago, a second national cross-sectional growth survey was undertaken in the same urban and suburban rural areas of nine main cities in China in 1985 as in 1975. In this survey 152,874 boys and girls from birth to age 7.0 years were measured for weight, height, sitting height, and chest, head and upper arm circumferences. Compared with the results in 1975, the condition of growth and development of children for both boys and girls from urban or suburban rural areas has been relatively much improved. Average weight and height had increased in the past 10 years by 0.40 kg and 1.8 cm respectively, in 6-7-year-old children. The greater part of the increase in height has been due to increase in leg length. The urban-rural difference in stature has become smaller, as the increase has been greater in rural areas. The data from this survey can be used as a new growth standard for Chinese children.

Relationship of mandibular anterior tooth apices to genial muscle attachments

Ten adult midsagittally sectioned cadaver heads were used to measure the distance between the apex of the central incisor or canine teeth and the attachment of the genioglossus or geniohyoid muscles. Measurements were made on both cadaver specimens and radiographs. The results of the two methods showed no statistically significant difference. The results indicate that there is a relatively small chance (5.6%) of including the genioglossus attachment in the lingual pedicle if an anterior mandibular subapical osteotomy is positioned 3 to 5 mm below the incisor apex but a large chance (65%) of including the genioglossus muscle when the osteotomy procedure includes the canine teeth.

Impairment of central mediation of the arterial baroreflex by acute ethanol administration

We investigated the possibility that the impairment of baroreflex control of heart rate was due to an action of ethanol on the central component of the baroreflex arc. Baroreceptors and baroreceptor afferents were removed from the arc by sino-aortic denervation and the central end of the left aortic depressor nerve was stimulated. Stimulation frequency response curves relating the decreases in blood pressure, heart rate and sympathetic efferent nerve discharge to the frequency of stimulation were constructed before and after the administration of 0.33, 0.66 and 1 g/kg of ethanol administered systemically. Except for a small decrease in blood pressure following the 1 g/kg dose, ethanol administration did not produce any change in baseline heart rate or blood pressure but the frequency response curve of heart rate was reset by the two lower doses of ethanol whereas the dose of 1 g/kg produced frank impairment of baroreflex control. Similarly the dose of 1 g/kg also impaired the depressor response to aortic nerve stimulation whereas it did not impair the baroreflex control of sympathetic efferent discharge. These data suggest a differential effect of ethanol on central pathways that control baroreflex responses. To ensure that the effect of ethanol was not due to an action of ethanol on an end organ, the heart, a separate group of rats were prepared with sino-aortic denervation and the peripheral end of the cut right vagus nerve was stimulated with increasing frequency. Ethanol did not affect the response to stimulation of the vagus nerve showing that the impairment of baroreflex control of cardiovascular variables was primarily of central origin.

A differential action for ethanol on baroreceptor reflex control of heart rate and sympathetic efferent discharge in rats

The acute effects of ethanol (0.33, 0.66, or 1 g/kg) on baroreflex control of heart rate (HR) and sympathetic efferent discharge (SED) were investigated in chloralose-anesthetized rats. The two higher doses of ethanol caused a progressive and significant increase in baseline SED and a slight increase in HR. That these effects were ethanol mediated is suggested by the absence of any change in blood pressure following ethanol injection in any amount used and the finding that equivolume saline had no effect on any of the tested parameters. On the other hand, the baroreflex slope of the MAP-SED relationship after ethanol was similar to the control (preethanol) value in contrast to a significant decrease in the baroreflex slope of MAP-HR under the same conditions. These findings suggest that the sensitivity of the reflex control of SED was preserved whereas that of HR was impaired after acute ethanol administration. Since these findings were obtained in the same animals, our data suggest that acute ethanol has a differential action on reflex control of SED and HR. Further, the significant increase in SED after moderate and high doses of ethanol suggests an increased central sympathetic tone as recordings were made from preganglionic nerve fibers (splanchnic nerve). The absence of an increase in baseline MAP, in spite of a significant increase in baseline SED following acute ethanol injection, could be explained, at least in part, by an ethanol-evoked reduction in pressor responsiveness to phenylephrine, an alpha-adrenergic agonist.

[Multicentric carcinoma of the esophagus and double primary malignant neoplasm of the upper alimentary tract--report on 44 patients]

During the past fifteen years, 44 patients with multicentric carcinoma of the esophagus or double primary malignant neoplasm of the upper alimentary tract, collected from 5316 patients with cancer of esophagus or gastric cardia in the same period, were treated in our hospital. The incidence was 0.83%. All were proven by pathology. Exploratory thoracotomy was done in 32 patients and 26 lesions were resected with a resection rate of 81.3%. All patients with cancer resected survived over 1 year, 6 out of 9 survived over 3 years and 2 out of 3, over 5 years. In the 18 patients who received chemotherapy alone, 12 were followed and all died within 1 year. It is shown that multicentric carcinoma of the esophagus or double malignant neoplasm of the upper alimentary tract should be given energetic treatment. Finally, the incidence, diagnosis criteria, diagnosis method, etiology and management are discussed with a review of literature.

Mechanism of interferon action. I. Characterization of a 54-kDa protein induced by gamma interferon with properties similar to a cytoskeletal component

A polypeptide of 54-kDa molecular mass (p54) induced by molecularly cloned human interferon gamma (rIFN-gamma) in human amnion U cells was characterized biochemically and immunologically. Rabbit polyclonal antibody to p54 was prepared using p54 purified from human amnion U cells as the immunogen. As measured by immunoprecipitation of [35S]methionine pulse-labeled extracts or by immunoblot analysis of unlabeled extracts, the synthesis of p54 was greatly elevated in three human cell lines treated with IFN-gamma, amnion U, fibroblast GM2767, and fibroblast F153. Moreover, the rabbit anti-p54 polyclonal antibody preparation cross-reacted with cytoskeleton-associated polypeptides prepared from human cells and from sea urchin embryos. By use of a monoclonal antibody probe directed against the common domain of intermediate filaments (anti-intermediate filament antibody), it was established that intermediate filament components are also induced by rIFN-gamma. Anti-p54 polyclonal antibody cross-reacted with anti-intermediate filament antibody-recognized, rIFN-gamma-induced polypeptides. Thus, it appears that p54 may be an IFN-induced cytoskeleton-associated polypeptide.

[Establishment of epithelial cell line TBC-27 from a human bladder transitional cell carcinoma and its biological characteristics]

The cell line TBC-27, from a human bladder transitional cell carcinoma Grade II, was established and maintained for 8 months through 27 passages. TBC-27 cells have the epithelioid cell morphology during culture. The population doubling time of the 14th generation cells was 27 hours by growth curve. The chromosome karyotype of the 12th generation cells consisted mainly of hypodiploid (mode 40-45). Ultrastructurally, there was a great deal of freeribosome and vesicle in the cytoplasm and a great number of atypical microvilli on the surface of the 21st generation cells. The heterotransplantation test revealed that the xenografted tumor in the immunosuppressed suckling rats was similar to the initial bladder carcinoma in histology.