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61.
Preclinical cadaveric study of transanal robotic proctectomy with total mesorectal excision combined with laparoscopic assistance
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Immunoglobulin G from patients with heparin-induced thrombocytopenia binds to a complex of heparin and platelet factor 4 总被引:6,自引:3,他引:6
Heparin-induced thrombocytopenia (HIT) is an important complication of heparin therapy. Although there is general agreement that platelet activation in vitro by the HIT IgG is mediated by the platelet Fc receptor, the interaction among the antibody, heparin, and platelet membrane components is uncertain and debated. In this report, we describe studies designed to address these interactions. We found, as others have noted, that a variety of other sulfated polysaccharides could substitute for heparin in the reaction. Using polysaccharides selected for both size and charge, we found that reactivity depended on two independent factors: a certain minimum degree of sulfation per saccharide unit and a certain minimum size. Hence, highly sulfated but small (< 1,000 daltons) polysaccharides were not reactive nor were large but poorly sulfated polysaccharides. The ability of HIT IgG to recognize heparin by itself was tested by Ouchterlony gel diffusion, ammonium sulfate and polyethylene glycol precipitation, and equilibrium dialysis. No technique demonstrated reactivity. However, when platelet releasate was added to heparin and HIT IgG, a 50-fold increase in binding of radio-labeled heparin to HIT IgG was observed. The releasate was then depleted of proteins capable of binding to heparin by immunoaffinity chromatography. Only platelet factor 4-immunodepleted releasate lost its reactivity with HIT IgG and heparin. Finally, to determine whether the reaction occurred on the surface of platelets or in the fluid phase, washed platelets were incubated with HIT IgG or heparin and after a wash step, heparin or HIT IgG was added, respectively. Reactivity was only noted when platelets were preincubated with heparin. Consistent with these observations was the demonstration of the presence of PF4 on platelets using flow cytometry. These studies indicate that heparin and other large, highly sulfated polysaccharides bind to PF4 to form a reactive antigen on the platelet surface. HIT IgG then binds to this complex with activation of platelets through the platelet Fc receptors. 相似文献
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John Hodkinson F.CP. Janet Couper-Smith D.M.R.D. Michael C Kew M.D. D.Sc. F.R.C.P. 《The American journal of gastroenterology》1988,83(7):786-788
We describe a 50-yr-old black laborer who presented with right lower chest pain, weight loss, and pedal edema. Ultrasonography and computed tomograms showed a large abscess cavity in the right lobe of the liver which extended very close to the inferior vena cava. The lumen of the adjacent inferior vena cava was partially occluded by thrombus, which could be traced up into the cavity of the right atrium. The hepatic veins were normally patent. Sterile blood-stained pus was aspirated from the abscess. Antibodies against Entamoeba histolytica were present in high titer in the patient's serum. Although propagation of hepatocellular carcinoma into the inferior vena cava and even up into the right atrium is well recognized, inferior vena caval thrombosis extending up into the right atrium has not hitherto been reported as a complication of amebic hepatic abscess. 相似文献
66.
Andrew M. Lippa Karen E. Ocwieja Julie Iglesias Rima Fawaz Scott Elisofon Christine Lee Tanvi S. Sharma 《Transplant infectious disease》2020,22(4)
A 20‐year‐old male presented 3.5 years after intestinal transplantation with rapidly progressive sensorineural hearing loss. Initial brain imaging was consistent with inflammation and/or demyelination. Lumbar puncture was initially non‐diagnostic and a broad infectious workup was unrevealing. Three months after presentation, a repeat LP detected JC virus for which tests had not earlier been conducted. He continued to deteriorate despite withdrawal of prior immunosuppression and addition of mirtazapine, maraviroc, and steroids. He died of progressive neurologic decompensation 5 months after his initial presentation. This case highlights progressive multifocal leukoencephalopathy (PML) as a rare complication after solid organ transplantation and acute sensorineural hearing loss as an unusual first presenting symptom of PML. JC virus should be considered in the differential diagnosis of acute sensorineural hearing loss in any immunocompromised patient. 相似文献
67.
Daniella Alejandra Pompa-Monroy Paulina Guadalupe Figueroa-Marchant Syed G. Dastager Meghana Namdeo Thorat Ana Leticia Iglesias Valentín Miranda-Soto Graciela Lizeth Prez-Gonzlez Luis Jesús Villarreal-Gmez 《Materials》2020,13(23)
Electrospun nanofibers are used for many applications due to their large surface area, mechanical properties, and bioactivity. Bacterial biofilms are the cause of numerous problems in biomedical devices and in the food industry. On the other hand, these bacterial biofilms can produce interesting metabolites. Hence, the objective of this study is to evaluate the efficiency of poly (Ɛ- caprolactone)/Curcumin (PCL/CUR) nanofibers to promote bacterial biofilm formation. These scaffolds were characterized by scanning electron microscopy (SEM), which showed homogeneous fibers with diameters between 441–557 nm; thermogravimetric analysis and differential scanning calorimetry (TGA and DSC) demonstrated high temperature resilience with degradation temperatures over >350 °C; FTIR and 1H-NMR serve as evidence of CUR incorporation in the PCL fibers. PCL/CUR scaffolds successfully promoted the formation of Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa biofilms. These results will be valuable in the study of controlled harvesting of pathogenic biofilms as well as in metabolites production for biotechnological purposes. 相似文献
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69.
Pérez Moreiras MI Alvarez Gutierrez AE Couselo Villanueva JM Iglesias Porto E González López R Arija Val F 《Gastroenterologia y hepatologia》2012,35(7):476-479
Meckel's diverticulum (MD) is a persistent embryonic remnant occurring in 2% of the general population. This entity is usually clinically silent and is only discovered when complications occur. Diagnosis is rarely made preoperatively. Surgical resection of symptomatic MD is widely accepted but the most appropriate management of asymptomatic MD remains unclear. We present a case of MD that summarizes some of the complications that may occur. The peculiarity of this case was that the complications were caused by a leiomyoma. The presence of tumoral disease in MD accounts for 3.2% of complications. The most common neoplasm is carcinoid tumor. Few publications have reported benign neoplasms in MD, probably due to their low incidence. 相似文献
70.
Oscar Campuzano Mireia Alcalde Paola Berne Esther Zorio Anna Iglesias Josep Navarro-Manchón Josep Brugada Ramon Brugada 《European journal of medical genetics》2013,56(10):541-545