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排序方式: 共有222条查询结果,搜索用时 15 毫秒
1.
2.
Tumor Vascularity Is Not a Prognostic Factor for Malignant Melanoma of the Skin 总被引:1,自引:4,他引:1
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Klaus J. Busam Marianne Berwick Karen Blessing Katrin Fandrey Sewon Kang Themis Karaoli Judy Fine Alistair J. Cochran Wain L. White Jason Rivers David E. Elder Duan-Ren Po Wen Bradley H. Heyman Raymond L. Barnhill 《The American journal of pathology》1995,147(4):1049-1056
Tumor vascularity has been proposed as a prognostic indicator for a number of solid tumors. Although a correlation between microvessel number and metastatic behavior has also been suggested for cutaneous melanoma, the small number of cases studied to date allows one to draw only preliminary conclusions. In this study, we have assessed tumor vascularity in cutaneous melanoma by comparing 60 cases of metastasizing and non-metastasizing tumors matched for tumor thickness, age, sex, and anatomic site. Ulex europaeus agglutinin I appeared to be the most suitable vascular marker for this study. Our results indicate that there was no statistically significant difference between the two groups with regard to tumor vascularity. Even after identifying 15 cases of thin (<1.0 mm thick) melanoma, there was no significant difference in the number of microvessels between metastasizing and non-metastasizing tumors. Comparison of patterns of vascular microarchitecture also failed to discriminate between the two groups. Thus, our results indicate that tumor vascularity may not be an independent prognostic factor for cutaneous melanoma. 相似文献
3.
Summary When islets were cultured with interleukin-1 (1 or 100 pmol/l) for 12 h in arginine-containing medium, cyclic GMP levels were increased 1.6- and 4.5-fold respectively. The arginine analogue, N--nitro-l-arginine methyl ester, which blocks nitric oxide formation and partially reverses inhibition of insulin secretion by 100 pmol/l interleukin-1, largely, but not completely, blocked generation of cyclic GMP. Treatment of islets with 100 pmol/l interleukin-1 for 12 h significantly decreased islet cyclic AMP generation in the absence of isobutylmethylxanthine (from 13.1±0.7 to 9.3±0.8 fmol/g islet protein), this fall was arginine-dependent and may have resulted from an effect on a cyclic AMP phosphodiesterase, since it was masked if isobutylmethylxanthine was present. Isobutylmethylxanthine (0.4 mmol/l) reduced the inhibitory potency of interleukin-1 in 15 h slightly but significantly from 80.5 to 59.0%. The morpholinosydnonimine SIN-1, which is a nitric oxide donor, inhibited insulin secretion, raised islet cyclic GMP and lowered cyclic AMP; its effects were similar to those of interleukin-1. However, 6-anilinoquinoline-5,8-quinone, [LY83583 (1–10 mol/l)], inhibited insulin secretion, and significantly decreased cyclic GMP while 8-bromocyclic GMP stimulated insulin secretion. Both low- and high-dose interleukin-1 treatment give a large arginine-dependent and a small, yet significant, arginine-independent increase in cyclic GMP. The inhibitory effect of SIN-1 or interleukin-1 on insulin secretion seems to depend to a small extent on decreased islet cyclic AMP, though sustained increases in nitric oxide or depleted islet GTP may directly affect the secretory process. 相似文献
4.
Iphigenia Phocas Themis Mantzavinos Dimitris Rizos Fotini Dimitriadou Katerina Arvaniti Pantelis A. Zourlas 《Journal of assisted reproduction and genetics》1992,9(3):233-237
Background Are follicles where no oocytes are retrieved empty follicles?Methods The levels of estradiol (E2), progesterone (P), testosterone (T), cortisol (F), and prolactin (PRL) of follicular fluids (FF) aspirated individually from 34 randomly selected IVF patients in whom no oocytes were recovered were compared with the respective hormone levels of FF obtained from the same patients when oocytes were retrieved. Two FF without oocytes of a 35th patient in whom no oocytes were retrieved were analyzed.Results Hormones did not differ significantly in the paired samples, while in the two FF of the 35th woman they were in agreement with cystic follicles.Conclusions It is necessary to differentiate aspirated follicles where no oocytes are retrieved from the empty follicle syndrome, which was not observed in the IVF series studied and should be rare in IVF patients. 相似文献
5.
M A Dimopoulos G Hamilos K Zervas A Symeonidis G Kouvatseas P Roussou D Gika T Karmiris K Bourantas A Zomas C Mitsouli I Xilouri E Vervessou K Matsis N Anagnostopoulos T Economopoulos 《Annals of oncology》2003,14(8):1299-1305
BACKGROUND: Waldenstrom's macroglobulinemia (WM) is an unusual lymphoplasmacytoid lymphoma characterized by the presence of a serum monoclonal immunoglobulin M. Although several studies have evaluated possible prognostic factors of this disease, few have focused on the survival and prognosis of symptomatic patients after the initiation of treatment. PATIENTS AND METHODS: Our study included 122 previously untreated patients with a median age of 67 years who required systemic treatment. Multiple variables were analyzed for their prognostic value on survival after initiation of treatment using univariate and Cox regression multivariate analysis. RESULTS: The median overall survival was 106 months. Pretreatment factors associated with shorter survival were age >/=65 years, splenomegaly, B-symptoms (weight loss, fever or night sweats), hemoglobin <10 g/dl, platelets <100 x 10(6)/dl, albumin <3.5 g/dl and bone marrow lymphoplasmacytic infiltrate >/=50%. In the multivariate analysis, the two variables with independent prognostic value were age >/=65 years and hemoglobin <10 g/dl. Furthermore, we were able to divide our patients into three risk groups based on the presence of two, one or none of these two adverse prognostic factors. The median survival times in the high-, intermediate- and low-risk groups were 46 months, 107 months and 172 months, respectively (P <0.0001). DISCUSSION: Our findings suggest that advanced age and anemia appear to be the two dominant prognostic factors for survival after initiation of treatment in patients with WM. These two readily available parameters can stratify the patients into three distinct subgroups and may help the selection of appropriate treatment. 相似文献
6.
Hammes TO Pedroso GL Hartmann CR Escobar TD Fracasso LB da Rosa DP Marroni NP Porawski M da Silveira TR 《Digestive diseases and sciences》2012,57(3):675-682
Background
Nonalcoholic fatty liver disease is one of the most prevalent forms of chronic liver disease in the Western world. Taurine is a conditionally essential amino acid in humans that may be a promising therapy for treating this disease. 相似文献7.
8.
Foreign body giant cell formation is preceded by lamellipodia formation and can be attenuated by inhibition of Rac1 activation 总被引:1,自引:0,他引:1
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Jay SM Skokos E Laiwalla F Krady MM Kyriakides TR 《The American journal of pathology》2007,171(2):632-640
Macrophages that are recruited to the site of implanted biomaterials undergo fusion to form surface-damaging foreign body giant cells. Exposure of peripheral blood monocytes to interleukin-4 can recapitulate the fusion process in vitro. In this study, we used interleukin-4 to induce multinucleation of murine bone marrow-derived macrophages and observed changes in cell shape, including elongation and lamellipodia formation, before fusion. Because cytoskeletal rearrangements are regulated by small GTPases, we examined the effects of inhibitors of Rho kinase (Y-32885) and Rac activation (NSC23766) on fusion. Y-32885 did not prevent cytoskeletal changes or fusion but limited the extent of multinucleation. NSC23766, on the other hand, inhibited lamellipodia formation and fusion in a dose-dependent manner. In addition, we found that in control cells, these changes were preceded by Rac1 activation. However, NSC23766 did not block the uptake of polystyrene microspheres. Likewise, short interfering RNA knockdown of Rac1 limited fusion without limiting phagocytosis. Thus, phagocytosis and fusion can be partially decoupled based on their susceptibility to NSC23766. Furthermore, poly(ethylene-co-vinyl acetate) scaffolds containing NSC23766 attenuated foreign body giant cell formation in vivo. These observations suggest that targeting Rac1 activation could protect biomaterials without compromising the ability of macrophages to perform beneficial phagocytic functions at implantation sites. 相似文献
9.
Shuai?Fei?ChenEmail author David?P.?Morgan Themis?J.?MichailidesEmail author 《Fungal Diversity》2014,67(1):157-179
Botryosphaeria panicle and shoot blight was considered as one of the single greatest threats to the California pistachio industry in the last two decades. A large number of fungi with typical morphological characteristics of Botryosphaeriaceae and Diaporthe were collected from pistachios in 18 counties in California and deposited in our culture collection. The aims of this study were to identify these isolates, recognize the distribution of these fungal species and test their pathogenicity to pistachio cultivars. A total of 304 California isolates were identified based on comparisons of DNA sequence data of the ITS, TEF-1α and β-tubulin gene regions, and combined with the morphological features of the cultures and conidia. Research results showed that California isolates represent eight species of Botryosphaeriaceae and one species of Diaporthe. These species include Botryosphaeria dothidea, Diplodia seriata, Dothiorella iberica, Dot. sarmentorum, Lasiodiplodia citricola, L. gilanensis, Neofusicoccum mediterraneum, Neof. vitifusiforme and Diaporthe chamaeropis. Of the Botryosphaeriaceae, 86 % of the isolates were identified as Neof. mediterraneum, which distributed in all the sampled counties. On pistachio trees, in addition to isolates from California, Neof. mediterraneum from Arizona, Neof. australe from Australia, B. dothidea, Neof. parvum and Dia. viticola from Greece were also identified. Pathogenicity of the California fungi on pistachio cultivars, Kerman (female) and Peters (male), using a mycelium plug and conidial suspension inoculation methods showed that all these species are pathogenic to the two tested pistachio cultivars, with L. citricola, L. gilanensis being the most pathogenic species, followed by Neof. mediterraneum. This study represents the first comprehensive work on the species identification, distribution and pathogenicity of Botryosphaeriaceae and Diaporthe on pistachio in California. 相似文献
10.
Anorexia, malnutrition, altered body composition and development of mesenteric obesity are well known features of inflammatory bowel disease (IBD). Recent data suggest that dysregulation of protein secretion by white adipose tissue is involved in these manifestations of patients with IBD. Adipocytes are recently recognized as endocrine cells that secrete a variety of bioactive substances known as adipocytokines. There is evidence that adipocytokines are involved in inflammatory and metabolic pathways in human beings. Overexpression of adipocytokines such as leptin, adiponectin and resistin in mesenteric adipose tissue of operated patients with Crohn's disease has recently been reported, suggesting that mesenteric adipocytes in IBD may act as immunoregulating cells. Therefore, it could be suggested that adipocytokines play an important role in the disease pathogenesis. Moreover, modulators of mesenteric adipose function have been suggested as potential therapeutic drugs in IBD. In this review, the importance of white adipose tissue function and adipocytokines, is discussed with respect to IBD. 相似文献