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排序方式: 共有987条查询结果,搜索用时 15 毫秒
1.
Color Doppler imaging of the ocular ischemic syndrome. 总被引:12,自引:0,他引:12
A C Ho W E Lieb P M Flaharty R C Sergott G C Brown T M Bosley P J Savino 《Ophthalmology》1992,99(9):1453-1462
PURPOSE: This study describes hemodynamic characteristics of the ophthalmic, central retinal, and posterior ciliary arteries in 16 eyes of 11 patients with the ocular ischemic syndrome. Understanding the hemodynamic characteristics of the retrobulbar circulation may elucidate the natural history and pathophysiology of the ocular ischemic syndrome and perhaps form the basis for rational treatment of this condition. METHODS: Color Doppler imaging, a procedure that permits rapid noninvasive imaging of the ophthalmic, central retinal, and posterior ciliary arteries, was used to quantitate peak systolic blood flow velocities and vascular resistance (pulsatility index) within these vessels in study group eyes and in an age-matched control population. RESULTS: We demonstrated markedly reduced ocular ischemic syndrome central retinal and posterior ciliary artery peak systolic velocities compared with control group eyes. Central retinal and posterior ciliary artery vascular resistance (pulsatility index) was greater in ocular ischemic eyes versus control group eyes. Reversal of ophthalmic artery blood flow was detected in 12 of 16 ocular ischemic syndrome eyes. Study group eyes with poor vision had no detectable posterior ciliary arterial blood flow. CONCLUSION: Color Doppler imaging quantitates hemodynamic characteristics of the retrobulbar circulation in the ocular ischemic syndrome. There is markedly reduced peak systolic velocity and increased vascular resistance in ocular end arteries such as the central retinal and posterior ciliary arteries. Ophthalmic artery reversal of flow seems to represent collateral blood flow to lower resistance vascular beds. Posterior ciliary artery hypoperfusion may correlate with poor vision in the ocular ischemic syndrome. 相似文献
2.
D Marazziti F Ambrogi R Vanacore V Mignani M Savino L Palego G B Cassano H S Akiskal 《Neuropsychobiology》1992,26(1-2):23-26
We investigated subsets of peripheral immunologic cells in 12 drug-free patients affected by major depression according to DSM-III-R criteria, and who had recent evidence of somatic diseases. They were compared with 10 drug-free depressives, with 10 patients with panic disorder, and with 12 healthy volunteers, all without somatic disease. The immune subsets were measured by flow cytometry. The results showed that both groups of depressives had the same abnormalities in immune cells compared with the healthy volunteers or the panic disorder patients; in particular they presented a lower number of CD3+, CD8+ and HLA-DR+. The patients with panic attacks did not differ from healthy controls, except for CD4+ cells which were significantly lowered, even in comparison with the depressive groups. These data, although preliminary and in a small sample, suggest that some immune parameters may be influenced by the presence of a major psychiatric disorder. 相似文献
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5.
Analysis of thymic epithelial cell proliferation in vitro by combining bromodeoxyuridine and keratin labeling in an immunofluorescence assay 总被引:1,自引:0,他引:1
A simple method of analyzing thymic epithelial cell (TEC) proliferation has been developed by combining bromodeoxyuridine (BrDU) and keratin labeling in an immunofluorescence assay. The first reagent specifically visualizes the cells entering the S phase of the cell cycle, whereas the second immunostaining reveals which of the proliferating BrDU-positive cells actually belong to the epithelial lineage. This method, besides being rapid and free of radioactivity, appears to be reliable in view of the minor variations in the percentages of BrDU+ TEC observed in several distinct experiments. Thus, BrDU/keratin immunolabeling appears to represent a useful tool for the analysis of in vitro TEC proliferation. 相似文献
6.
Cytokeratin (CK) expression was investigated, by means of immunocytochemistry, in
the hamster thymic epithelium during ontogeny, as well as in primary cultures and
upon glucocorticoid hormone treatment in vivo. As compared to the distribution pattern
of distinct monoclonal antibody-defined cytokeratins in the normal adult thymus, CK
modulation was evidenced in the three situations studied. During thymus ontogeny,
both cytokeratins of simple lining epithelia, as CK8 and CK18, as well as the CK1/CK10
pair (typical marker of terminal stage of keratinization), were expressed since early
stages of thymus development. They were located in the central region of thymic lobules
preceding the cortical-medullary distinctions. This differed from what had been
previously shown for mouse thymus ontogeny, revealing that the interspecific diversity
in the distribution pattern of thymic cytokeratins occurred early in fetal life. A
modulation of CK expression was also detected when hamster thymic epithelial cells
(TEC) were led to grow in culture, with a down-regulation of CK19 contrasting with an
enhancement of CK18 expression. This diverged from the maintenance of the in situ
pattern when human TEC were cultured. Last, in vivo hydrocortisone treatment, known
to increase the numbers of KL1+ cells in the mouse thymus medulla, promoted a cortical
expression of the CK1/CK10 pair in the hamster thymus. Taken together, our findings
demonstrate a continuous plasticity of the thymic epithelium, at least regarding
cytokeratin expression, and enlarge the concept of interspecific diversity of intrathymic
CK distribution in conditions as morphogenesis, in vitro system, and responsiveness to
glucocorticoid hormone treatment. 相似文献
7.
D. Boscia V. Savino A. Minafra S. Namba V. Elicio M. A. Castellano D. Gonsalves G. P. Martelli 《Archives of virology》1993,130(1-2):109-120
Summary A virus with highly flexuous filamentous particles c. 800 nm long, showing distinct transverse striations was isolated with high frequency (60%) by inoculation ofNicotiana occidentalis with sap from grapevine accessions indexing positive for corky bark. The virus, for which the name grapevine virus B (GVB) is proposed, has an ssRNA genome with mol. wt. of c. 2.5×106 Da (c. 7600 nt) and coat protein subunits with mol. wt. of c 23,000 Da. GVB has a very restricted herbaceous host range and was experimentally transmitted by the mealybugPseudococcus ficus. The physicochemical and ultrastructural properties of GVB resemble those of closteroviruses. However, it is serologically unrelated to other grapevine closteroviruses including grapevine virus A, with which it shares some biological and physicochemical properties. 相似文献
8.
Miranda Michele Zarivi Osvaldo Amicarelli Fernanda Ragnelli Anna Maria Aimola Pierpaolo Porretta Rocchina Natali Pier Giorgio Arcadi Antonio Savino Maria Poma Anna Bonfigli Antonella 《Journal of neuro-oncology》1997,31(1-2):185-193
This paper presents evidence that L-tyrosine oxidation products and 5,6-dihydroxyindole, an intermediate of melanin synthesis bind to and modify DNA structure, as tested by extracting cell DNA, using topoisomerase I and denaturation assays. When supercoiled plasmid pCU18 or pBR322 DNAs are treated with 5,6-dihydroxyindole the supercoiled species disappear and are converted to species less mobile in a gel retardation test with respect to relaxed DNA. 5,6-Dihydroxyindole causes an easier acid denaturation of the double helix. The results, that are dose dependent,would point to both intercalation and cross-linking of DNA by 5,6-dihydroxyindole and its oxidation product(s). 3H-L-tyrosine deriving radioactivity, bound to nuclear DNA, is higher at low pH, (5.6) if compared to pH 6.8. The highest radioactivity bound to cell DNA is found during the transition from the amelanotic to the melanotic phenotype in human melanoma cell lines. As a control, the binding of 3H-L-tyrosine radioactivity to human prostate fibroblast DNA was investigated. 相似文献
9.
Pierfrancesco Tassone Paola Neri Renate Burger Rocco Savino Masood Shammas Laurence Catley Klaus Podar Dharminder Chauhan Serena Masciari Antonella Gozzini Pierosandro Tagliaferri Salvatore Venuta Nikhil C Munshi Kenneth C Anderson 《Clinical cancer research》2005,11(11):4251-4258
Interleukin-6 (IL-6) protects multiple myeloma cells against apoptosis induced by glucocorticoids. Here, we investigated whether inhibition of the IL-6 signaling pathway by the IL-6 receptor superantagonist Sant7 enhances the in vivo antitumor effects of dexamethasone on the IL-6-dependent multiple myeloma cell line INA-6. For this purpose, we used a novel murine model of human multiple myeloma in which IL-6-dependent INA-6 multiple myeloma cells were directly injected into human bone marrow implants in severe combined immunodeficient (SCID) mice (SCID-hu). The effect of in vivo drug treatments on multiple myeloma cell growth was monitored by serial determinations of serum levels of soluble IL-6 receptor (shuIL-6R), which is released by INA-6 cells and served as a marker of tumor growth. In SCID-hu mice engrafted with INA-6 cells, treatment with either Sant7 or dexamethasone alone did not induce significant reduction in serum shuIL-6R levels. In contrast, the combination of Sant7 with dexamethasone resulted in a synergistic reduction in serum shuIL-6R levels after 6 consecutive days of treatment. Gene expression profiling of INA-6 cells showed down-regulation of proliferation/maintenance and cell cycle control genes, as well as up-regulation of apoptotic genes in multiple myeloma cells triggered by Sant7 and dexamethasone combination. In vitro colony assays showed inhibition of myeloid and erythroid colonies from normal human CD34(+) progenitors in response to dexamethasone, whereas Sant7 neither inhibited colony growth nor potentiated the inhibitory effect of dexamethasone. Taken together, these results indicate that inhibition of IL-6 signaling by Sant7 significantly potentiates the therapeutic action of dexamethasone against multiple myeloma cells, providing the preclinical rationale for clinical trials of Sant7 in combination with dexamethasone to improve patient outcome in multiple myeloma. 相似文献
10.