RESUMEN

Platelet transfusion is one of the most reliable strategies to cure patients suffering from thrombocytopenia or platelet dysfunction. With the increasing demand for transfusion, however, there is an undersupply of donors to provide the platelet source. Thus, scientists have sought to design methods for deriving clinical-scale platelets ex vivo. Although there has been considerable success ex vivo in the generation of transformative platelets produced by human stem cells (SCs), the platelet yields achieved using these strategies have not been adequate for clinical application. In this review, we provide an overview of the developmental process of megakaryocytes and the production of platelets in vivo and ex vivo, recapitulate the key advances in the production of SC-derived platelets using several SC sources, and discuss some strategies that apply three-dimensional bioreactor devices and biochemical factors synergistically to improve the generation of large-scale platelets for use in future biomedical and clinical settings.

RESUMEN

BACKGROUND: The expression of follistatin-like protein 1 (FSTL1) is closely associated with diseases of the musculoskeletal system. However, despite being a well characterized inflammatory mediator, the effects of FSTL1 on chondrocytes are not completely understood. In this study, we investigated the effects of FSTL1 on the expression of inflammatory and catabolic factors in rat chondrocytes. METHODS: Rat chondrocytes were treated directly with various concentrations of FSTL1 in vitro. The levels of matrix metalloproteinases (MMPs), inducible nitric oxide synthase (iNOS), cyclooxygenase (COX)-2, interleukin (IL)-1ß, tumour necrosis factor (TNF)-α and IL-6 were measured by polymerase chain reaction, ELISA and Western blotting. In addition, activation of the nuclear factor kappa B (NF-κB) pathway was explored to identify potential regulatory mechanisms. RESULTS: Follistatin-like protein 1 directly increased the expression of MMP-1, MMP-13, iNOS, COX-2, IL-1ß, TNF-α and IL-6 at both gene and protein level in a dose-dependent manner. Activation of NF- κB and phosphorylation of p65 were also promoted by FSTL1 stimulation. CONCLUSIONS: Follistatin-like protein 1 exerts pro-inflammatory and catabolic effects on cultured chondrocytes via activation of the NF-κB signalling pathway. FSTL1 may therefore be a target in the treatment of OA.

Asunto(s)

RESUMEN

AIMS: Postmenopausal osteoporosis is a bone metabolism disease that is caused by an imbalance between bone-resorbing osteoclast and bone-forming osteoblast actions. Herein, we describe the role of troxerutin (TRX), a trihydroxyethylated derivative of rutin, in ovariectomy (OVX)-induced osteoporosis and its effects on the regulation of osteoclasts and osteoblasts. MAIN METHODS: In vivo, OVX female mice were intraperitoneally injected with either saline, 50 mg/kg TRX, or 150 mg/kg TRX for 6 weeks and then sacrificed for micro-computed tomography analyses, histological analyses, and biomechanical testing. In vitro, RAW264.7 cell-derived osteoclasts and MC3T3-E1 cell-derived osteoblasts were treated with different concentrations of TRX to examine the effect of TRX on osteoclastogenesis and bone resorption, as well as on osteogenesis and mineralization. KEY FINDINGS: In this study, we demonstrated that TRX prevented cortical and trabecular bone loss in ovariectomized mice by reducing osteoclastogenesis and promoting osteogenesis in vivo. In vitro, TRX inhibited the formation and activity of RAW264.7-derived osteoclasts and the expression of nuclear factor of activated T-cells 1 and cathepsin K. Meanwhile, TRX improved the osteogenesis and mineralization of MC3T3-E1 by enhancing the expression of Runt-related transcription factor 2, Osterix, and collagen type 1 alpha 1. SIGNIFICANCE: Our data demonstrated that TRX could prevent OVX-induced osteoporosis and be used in a novel treatment for postmenopausal osteoporosis.

Asunto(s)

RESUMEN

In this study, Pb-Co powder-pressed alloy was fabricated and used as a suitable anode material to replace Pb-Ca-Sn alloy in electrowinning. The Pb-Co anodes and the traditional Pb-Ca-Sn alloy on the electrochemical properties are investigated in a 160 g L-1 H2SO4 solution at 35 °C using galvanostatic polarization, electrochemical impedance spectroscopy and Tafel test. Thereafter, the anodic oxide layer is observed by energy dispersive X-ray spectroscopy along with scanning electron microscopy and X-ray diffractometry. The results show that the potential and oxygen evolution over-potential of the anodes exhibit a declining trend with increasing the fraction of Co. The anode potential of the Pb-2 wt% Co is approximately 170 mV lower than that of Pb-Ca-Sn alloy and reaches a stable value of 1.291 V at 35 °C, which shows good electrocatalytic performance and commercial application prospect.

RESUMEN

AIM: To determine the dominant predictive factors of postoperative visual recovery for patients with pituitary adenoma. METHODS: PubMed, Google Scholar, Web of Science and Cochrane Library were searched for relevant human studies, which investigated the prediction of the postoperative visual recovery of patients with pituitary adenoma, from January 2000 to May 2017. Meta-analyses were performed on the primary outcomes. After the related data were extracted by two independent investigators, pooled weighted mean difference (WMD) and odds ratio (OR) with 95% confidence interval (CI) were estimated using a random-effects or a fixed-effects model. RESULTS: Nineteen studies were included in the literature review, and nine trials were included in the Meta-analysis, which comprised 530 patients (975 eyes) with pituitary adenoma. For the primary outcomes, there was a significant difference between preoperative and postoperative mean deviation (MD) values of the visual field (WMD -5.85; 95%CI: -8.19 to -3.51; P<0.00001). Predictive characteristics of four factors were revealed in this Meta-analysis by assigning the patients to sufficient and insufficient groups according to postoperative visual field improvements, including preoperative visual field defect (WMD 10.09; 95%CI: 6.17 to 14.02; P<0.00001), patient age (WMD -12.32; 95%CI: -18.42 to -6.22; P<0.0001), symptom duration (WMD -5.04; 95%CI: -9.71 to -0.37; P=0.03), and preoperative peripapillary retinal nerve fiber layer (pRNFL) thickness (OR 0.1; 95% CI: 0.04 to 0.23; P<0.00001). CONCLUSION: Preoperative visual field defect, symptom duration, patient age, and preoperative pRNFL thickness are the dominant predictive factors of the postoperative recovery of the visual field for patients with pituitary adenoma.

RESUMEN

BACKGROUND: It remains unclear whether conservative treatment should be used to treat the common undisplaced femoral neck fractures that develop in the elderly. Herein, we systematically review the rates of union and avascular necrosis after conservative and surgical treatment of undisplaced femoral neck fractures. METHODS: We searched the EMBASE, PubMed, OVID, Cochrane Library, Web of Science, and Scopus databases for randomized controlled trials or observational studies that assessed the outcomes of conservative or surgical treatments of undisplaced femoral neck fractures. No language or publication year limitation was imposed. Statistical analyses were performed with the aid of the chi-squared test. We evaluated the quality of each publication and the risk of bias. RESULTS: Twenty-nine studies involving 5071 patients were ultimately included; 1120 patients were treated conservatively and 3951 surgically. The union rates were 68.8% (642/933) and 92.6% (635/686) in the former and latter groups, respectively (p < 0.001). The avascular necrosis rate in the conservatively treated group was 10.3% (39/380), while it was 7.7% (159/2074) in the surgically treated group (p = 0.09). CONCLUSIONS: Surgery to treat undisplaced femoral neck fractures was associated with a higher union rate and a tendency toward less avascular necrosis than conservative treatment.

Asunto(s)

RESUMEN

Desktop three-dimensional (3D) printers (D3DPs) have become a popular tool for fabricating personalized consumer products, favored for low cost, easy operation, and other advantageous qualities. This study focused on the potential for using D3DPs to successfully, rapidly, and economically print customized implants at medical clinics. An experiment was conducted on a D3DP-printed anterior cruciate ligament surgical implant using a rabbit model. A well-defined, orthogonal, porous PLA screw-like scaffold was printed, then coated with hydroxyapatite (HA) to improve its osteoconductivity. As an internal fixation as well as an ideal cell delivery system, the osteogenic scaffold loaded with mesenchymal stem cells (MSCs) were evaluated through both in vitro and in vivo tests to observe bone-ligament healing via cell therapy. The MSCs suspended in Pluronic F-127 hydrogel on PLA/HA screw-like scaffold showed the highest cell proliferation and osteogenesis in vitro. In vivo assessment of rabbit anterior cruciate ligament models for 4 and 12 weeks showed that the PLA/HA screw-like scaffold loaded with MSCs suspended in Pluronic F-127 hydrogel exhibited significant bone ingrowth and bone-graft interface formation within the bone tunnel. Overall, the results of this study demonstrate that fabricating surgical implants at the clinic (fab@clinic) with D3DPs can be feasible, effective, and economical.

Asunto(s)

RESUMEN

AIM: The anatomic characters and applicability of the extended pterional transtemporal transtentorial (EPTT) approach versus the subtemporal transtentorial (ST) approach for surgical treatment of petroclival tumors were evaluated. MATERIAL AND METHODS: Ten sides from five adult Chinese injected cadavers were manipulated using both two approaches. Four deep bony anatomic landmarks were specified in the skull base to create two adjoining triangles that were respectively located in the anterior and posterior petroclival region. The real, projected area and the percentage of the projected area were determined and calculated to compare the deep exposure from the two approaches. RESULTS: There was no difference regarding the percentage of the projected area was calculated in the anterior triangles (EPTT, 21.5±12.5%; ST, 28.8±14.9%; p=0.1948), but a significant difference was present in the posterior triangles (EPTT, 74.0±4.5%; ST, 51.5±4.3%; p < 0.01). Compared with the ST approach, the EPTT approach provides an equivalent percentage of projected area in the middle cranial fossa and a wider exposed area in the posterior cranial fossa. CONCLUSION: Through anatomic comparative analysis the EPTT approach provides better exposure and is more appropriate than the ST approach for large and giant petroclival tumors predominantly in the posterior cranial fossa with extensive invasion to parasellar structures and the cavernous sinus.

Asunto(s)

RESUMEN

Early brain injury (EBI), a significant contributor to poor outcome after subarachnoid hemorrhage (SAH), is intimately associated with neuronal apoptosis. Recently, the protective role of hydrogen (H2 ) in the brain has been widely studied, but the underlying mechanism remains elusive. Numerous studies have shown nuclear factor-κB (NF-κB) as a crucial survival pathway in neurons. Here we investigated the role of H2 in EBI following SAH, focusing on the NF-κB pathway. A double blood injection model was used to produce experimental SAH, and H2 -rich saline was injected intraperitoneally. NF-κB activity within the occipital cortex was measured. Immunofluorescence was performed to demonstrate the activation of NF-κB; Bcl-xL and cleaved caspase-3 were determined via Western blot. Gene expression of Bcl-xL was detected by real-time PCR, and TUNEL and Nissl staining were performed to illustrate brain injury in the occipital cortex. SAH induced a significant increase of cleaved caspase-3. Correspondingly, TUNEL staining demonstrated obvious neuronal apoptosis following SAH. In contrast, H2 treatment markedly increased NF-κB activity and the expression of Bcl-xL and decreased the level of cleaved caspase-3. Additionally, H2 treatment significantly reduced post-SAH neuronal apoptosis. The current study shows that H2 treatment alleviates EBI in the rabbits following SAH and that NF-κB/Bcl-xL pathway is involved in the protective role of H2 .

Asunto(s)

Asunto(s)

RESUMEN

BACKGROUND: Increasing experimental and clinical data indicate that early brain injury (EBI) after subarachnoid hemorrhage (SAH) largely contributes to unfavorable outcomes, and it has been proved that EBI following SAH is closely associated with oxidative stress and brain edema. The present study aimed to examine the effect of hydrogen, a mild and selective cytotoxic oxygen radical scavenger, on oxidative stress injury, brain edema and neurology outcome following experimental SAH in rabbits. RESULTS: The level of MDA, caspase-12/3 and brain water content increased significantly at 72 hours after experimental SAH. Correspondingly, obvious brain injury was found in the SAH group by terminal deoxynucleotidyl transferase-mediated uridine 5'-triphosphate-biotin nick end-labeling (TUNEL) and Nissl staining. Similar results were found in the SAH+saline group. In contrast, the upregulated level of MDA, caspase-12/3 and brain edema was attenuated and the brain injury was substantially alleviated in the hydrogen treated rabbits, but the improvement of neurology outcome was not obvious. CONCLUSION: The results suggest that treatment with hydrogen in experimental SAH rabbits could alleviate brain injury via decreasing the oxidative stress injury and brain edema. Hence, we conclude that hydrogen possesses the potential to be a novel therapeutic agent for EBI after SAH.

Asunto(s)

RESUMEN

OBJECTIVE: To assess the preventive effect of sodium valproate on early posttraumatic seizures in traumatic brain injury (TBI) patients. METHODS: The retrospective study was based on 159 patients with TBI treated at Department of Neurosurgery, Nanjing General Hospital of Nanjing Command enrolled between January 1, 2008 and December 31, 2009. The in-hospital section of the retrospectively collected database includes information on age, sex, initial Glasgow Coma Score (GCS), results of CT scanning, operation, usage of sodium valproate, seizures in the first week after injury and outcome. RESULTS: Seven patients (4.4%) showed early posttraumatic seizures. Although the incidence was zero in patients who received sodium valproate treatment, the difference between the treatment and control groups was not statistically significant. Of the 87 severe TBI patients (GCS 3-8), 6 patients in the control group (6.9%) suffered from early seizures during the first week after TBI and no patient who received preventive therapy suffered from seizures. The difference between the treatment and the control groups was still not statistically significant. Of the 72 mild and moderate TBI patients (GCS 9-15), only 1 patient in the control group suffered from seizures and no patient in the treatment group suffered. CONCLUSIONS: Although the results suggest that the study is not sufficiently powerful to detect a clinically important difference in the seizure rates between the treatment and control groups, sodium valproate is effective in decreasing the risk of early posttraumatic seizures in severe TBI patients. Further prospective studies are recommended.

Asunto(s)

RESUMEN

BACKGROUND: The goal of this report is to illustrate the use of intraoperative indocyanine green (ICG) angiography in the surgical management of intracranial aneurysms, including microsurgical clipping and revascularization. METHODS: This study included a series of 45 patients who were surgically treated between June 2007 and May 2008 for intracranial aneurysms. Fourty-three of the patients had anterior circulation aneurysms, and 2 had posterior circulation aneurysms. Forty-one patients were treated with microsurgical clipping. Four patients underwent revascularization combined with aneurysm dissection or trapping. Intraoperative ICG angiography was used to visualize the aneurysm clipping, patency of parent artery or graft. The ICG angiography technique is described, with particular reference to evaluation of the aneurysm clipping and revascularization. RESULTS: Eighty-nine ICG angiography procedures were performed in 45 patients with intracranial aneurysms. The aneurysms were completely obliterated for all patients, and the grafts were patented for all except 1 patient. Pre-clipping ICG angiography showed the relationship of aneurysm and its parent artery clearly. After aneurysms being clipped, intraoperative ICG angiography found remnant of aneurysms, stenosis or occlusion of parent arteries and grafts in 8 cases, which were revised in the same surgical procedure. The results of ICG angiography correlated well with postoperative DSA in 97% patients. CONCLUSION: ICG angiography can provide real-time information and guide revision in the same surgical procedure for the management of intracranial aneurysms.

Asunto(s)

RESUMEN

OBJECTIVE: To detect the hypermethylation status of RASSF1A promoter in serum DNA of non-small cell lung cancer (NSCLC) patient and evaluate its correlation with clinicopathological parameters. METHODS: Serum DNA was extracted from the peripheral blood of 75 NSCLC patients and another 35 patients with benign pulmonary disease and 15 healthy donors. The methylation status of RASSF1A promoter was determined using methylation-specific PCR (MSP), and the correlation of methylation profiles with clinicopathological parameters was statistically analyzed. RESULTS: Aberrant methylation of RASSF1A was detected in 23 of 75 (30.7%) cancer patients, but in none of patients with benign pulmonary disease or in healthy donors (P <0.001). RASSF1A hypermethylation status was found to be correlated with late stage and poor differentiation (P < 0.05), but not with gender, age or histopathology in NSCLC patients. CONCLUSION: Hypermethylated RASSF1A promoter is frequently found in the serum DNA of non-small cell lung cancer patient, and RASSF1A may become a promising novel biomarker for diagnosis and prognosis prediction in lung cancer.

Asunto(s)

RESUMEN

Pituitary adenoma is one of the important etiologies of male infertility. The early diagnosis of pituitary adenoma that caused infertility is not difficult with the help of modem incretion examination and imaging technique. The treatment focused on pituitary adenoma is no doubt the optimal choice of this kind of male infertility.

Asunto(s)

RESUMEN

<p><b>OBJECTIVE</b>To study the clinical pathological features and immunophenotype of follicular dendritic cell sarcoma (FDCS) with discussion on its diagnostic clues to improve diagnostic level.</p><p><b>METHODS</b>Five cases of FDCS were analyzed by clinical, pathologic and immunohistochemistry methods.</p><p><b>RESULTS</b>Five cases of FDCS were located in the cervical lymph node. Microscopically, the normal architectures were effaced by ovoid, spindle-shaped with fascicular, diffuse or whorled patterns and with rich lightly eosinophilic cytoplasm, syncytial appearance. Nuclei tend to show irregular clustering, scattered multinucleated giant cell. Nucleoli often distinct, sometimes prominent. Mitotic count variable, may show significant cellular pleomorphism. Immunohistochemical studies show that the tumor cells were positive for CD21, CD35, but negative for CD1a, CD34, CK and HMB45. Under electron microscopy, the tumor cells possessed long villus cytoplasmic processes and desmosome-like junctions, Birbeck granules were absent.</p><p><b>CONCLUSIONS</b>FDCS is a rare malignant tumor and differential diagnosis includes Langerhans cell sarcoma, interdigitating dentric cell sarcoma, malignant fibrous histocytoma, melanoma, metastatic spindle cell carcinoma and others. Immunohistochemistry and electron microscopy are necessary for a correct diagnosis.</p>

Asunto(s)

RESUMEN

Subarachnoid hemorrhage (SAH) has considerable mortality and morbidity, but the pathophysiologic mechanism is not entirely clear. Following SAH, blood or its lysate enters the subarachnoid space. This study examined how blood lysate influences the vulnerable brain following SAH. Heparinized hemolysate was slowly injected into the cisterna magna of 10 female rabbits, while a control group of 10 rabbits received a similar injection of heparinized isotonic sodium chloride solution without hemolysate. The basilar artery and brain tissue were excised after perfusion fixation. The degree of cerebral vasospasm was evaluated by measuring the cross-sectional area of the basilar artery, and brain damage was investigated by TUNEL staining. In the SAH group, the apoptosis index of neuronal cells located at the base of the temporal lobe averaged 26% (range = 3 to 56%), which was significantly higher than the corresponding apoptosis index in the control group (mean 0.5%, range = 0 to 4%, p <0.001). The mean cross-sectional area of the basilar artery in the SAH group did not differ significantly from that in the control group. These results suggest that SAH induces apoptosis of neuronal cells by a mechanism that is independent of cerebral vasospasm.

Asunto(s)

RESUMEN

OBJECTIVE: To construct a dually targeting gene therapy system for pituitary adenomas and investigate its effect. METHODS: Promoter hGHp containing human growth hormone gene was obtained from human genome and cloned into the plasmid pcDNA3.1/His A with the promoter cut to construct the recombinant plasmid pcDNA3.1/His A-hGHp. HSV-TK gene was obtained from the plasmid pcDNA3.1/His A-TK and integrated into the plasmid pcDNA3.1/His A-hGHp to construct the recombinant plasmid pcDNA3.1/His A-hGHp-TK. A GE7 gene delivery system-mediated human growth hormone promoter controlled gene therapy system was constructed by adding the mixture of GE7-polylysine and HA20-polylysine into the DNA solution. Human growth hormone-secreting pituitary adenoma cells of the GH3 line, human myeloma cells of the U-2OS line, and human oophoroma cells of the HO8910PM line were cultured and transfected with PBS or GE7 packaged pcDNA3.1/HisA-TK or pcDNA3.1/HisA-hGHp-TK. Western blotting was used to examine the expression of PBS or GE7 packaged pcDNA3.1/HisA-TK or pcDNA3.1/HisA-hGHp-TK protein, MTT method was used to detect the cell survival rate. Another GH3, U-2OS, and HO8910PM cells were cultured and transfected with PBS or GE7 packaged pcDNA3.1/HisA-TK or pcDNA3.1/HisA-hGHp-TK and then ganciclovir (GCV) was added. MTT method was used to examine the cell survival rates. GH3 cells were injected subcutaneously into the right axilla of 200 SD nude rats loaded with human pituitary adenoma. Three weeks after the rats were randomly divided into 5 equal groups: PBS group in which PBS was injected into the tumor and GCV was injected peritoneally; GE7 group in which GE7-polylysine and HA20-polylysine were injected into the tumor and GCV was injected peritoneally; without TK group in which GE7-packaged pcDNA3.1/His A-hGHp was injected into the tumor and GCV was injected peritoneally; without GCV group in which GE7-packaged pcDNA3.1/His A-hGHp-TK was injected into the tumor and PBS was injected peritoneally; and treatment group in which GE7-packaged pcDNA3.1/His A-hGHp-TK was injected into the tumor and GCV was injected peritoneally. Peritoneal injection lasted 21 days for all groups. On the days 3, 7, 14, and 21 eight rats from each group were killed to measure the volume of tumor. The survival rate of the rest 8 rats was observed. RESULTS: A dually targeting gene therapy system for pituitary adenoma was composed successfully. HSV-TK protein was expressed in the GH3 cells but not in the U-2OS and HO8910PM cells after transfection of GE7-packaged pcDNA3.1/HisA-hGHp-TK; and was expressed in the GH3 and HO8910PM cells but not in the U-2OS cells after transfection of GE7-packaged pcDNA3.1/HisA-TK. Transfection of GE7-packaged pcDNA3.1/HisA-hGHp-TK and addition of GCV significantly decreased the survival rate of the GH3 cells, but did not influence the survival rates of the U-2OS and HO8910PM cells. Transfection of GE7-packaged pcDNA3.1/HisA-TK and addition of GCV significantly decreased the survival rate of GH3 and HO8910PM cells but did not influence the survival of the U-2OS and HO8910PM cells. When the GH3 cells were transfected with GE7-packaged pcDNA3.1/HisA-hGHp-TK with the addition of GCV of the concentration of 4 mg/L the survival rate decreased to 10%, when the GCV concentration was raised to 8 mg/L the survival rate of the GH3 cells was < 5%. Three days after the beginning of treatment the tumor volume of different groups of rats increased at different degrees and the tumor was smallest in the treatment group in comparison with the other groups (all P < 0.05). Seven days after the beginning of treatment the tumor volume of the treatment group significantly decreased and the tumors of the other groups still increased (all P < 0.001). The survival time of the treatment group was over 120 days, significantly longer than those of the other groups (all about 40 days). CONCLUSION: GE7 system-mediated hGHp controlled gene therapy system is hopeful to be the targeted therapeutic strategy for pituitary adenomas.

Asunto(s)

Asunto(s)