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1.
Int J Mol Med ; 45(4): 1176-1186, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32124959

RESUMO

Carbon monoxide­releasing molecule­3 (CORM­3), which is an exogenous carbon monoxide (CO) compound, slowly releases CO under physiological conditions; this exerts neuroprotective effects against incomplete ischemia/reperfusion injury. The objective of the present study was to investigate whether the administration of CORM­3 protects against nucleotide­binding oligomerization domain­like receptor pyrin domain­3 (NLRP3) inflammasome formation and neuronal pyroptosis in the hippocampus following hemorrhagic shock and resuscitation (HSR). To establish this, an HSR model was created. Hemorrhagic shock was induced in adult male Sprague­Dawley rats under sevoflurane anesthesia by bleeding using a heparinized syringe to maintain a mean arterial pressure of 30±5 mmHg for 60 min. Resuscitation was performed by reperfusion of the blood and, if necessary, administering sterile saline to achieve the baseline arterial pressure. Following resuscitation, CORM­3 (4 mg/kg) was injected via the femoral vein. Neuronal pyroptosis in the hippocampus, mitochondrial morphology, mitochondrial DNA (mtDNA), brain magnetic resonance imaging, expression levels of NLRP3 and the interaction of pro­caspase­1 and apoptosis­associated speck­like protein containing a CARD domain (ASC) were examined 12 h after HSR; locomotor activity was assessed 7 days after HSR. Compared with HSR­treated rats, CORM­3 administration resulted in a lower level of neuronal pyroptosis in the hippocampus, improved mitochondrial morphology, a lower mtDNA level, steadier levels of metabolites, decreased expression levels of NLRP3 and pro­caspase­1 interacting with ASC and enhanced locomotor activity. In conclusion, treatment with CORM­3 ameliorated impairments of locomotor and exploratory activities in a rat model of HSR. The mechanism may be associated with the inhibition of mitochondrial DNA­induced pyroptosis via improvements in cell metabolism.

2.
World Neurosurg ; 132: e21-e27, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31521754

RESUMO

BACKGROUND: To investigate role of Low-dose, Early Fresh frozen plasma Transfusion (LEFT) therapy in preventing perioperative coagulopathy and improving long-term outcome after severe traumatic brain injury (TBI). METHODS: A prospective, single-center, parallel-group, randomized trial was designed. Patients with severe TBI were eligible. We used a computer-generated randomization list and closed opaque envelops to randomly allocate patients to treatment with fresh frozen plasma (5 mL/kg body weight; LEFT group) or normal saline (5 mL/kg body weight; NO LEFT group) after admission in the operating room. RESULTS: Between January 1, 2018, and November 31, 2018, 63 patients were included and randomly allocated to LEFT (n = 28) and NO LEFT (n = 35) groups. The final interim analysis included 20 patients in the LEFT group and 32 patients in the NO LEFT group. The study was terminated early for futility and safety reasons because a high proportion of patients (7 of 20; 35.0%) in the LEFT group developed new delayed traumatic intracranial hematoma after surgery compared with the NO LEFT group (3 of 32; 9.4%) (relative risk, 5.205; 95% confidence interval, 1.159-23.384; P = 0.023). Demographic characteristics and indexes of severity of brain injury were similar at baseline. CONCLUSIONS: LEFT therapy was associated with a higher incidence of delayed traumatic intracranial hematoma than normal fresh frozen plasma transfusion in patients with severe TBI. A restricted fresh frozen plasma transfusion protocol, in the right clinical setting, may be more appropriate in patients with TBIs.


Assuntos
Transfusão de Sangue/métodos , Lesões Encefálicas Traumáticas/terapia , Plasma , Idoso , Lesões Encefálicas Traumáticas/complicações , Lesões Encefálicas Traumáticas/cirurgia , Craniotomia , Método Duplo-Cego , Feminino , Hematoma Subdural Agudo/cirurgia , Hematoma Subdural Agudo/terapia , Humanos , Hemorragia Intracraniana Traumática/complicações , Hemorragias Intracranianas/etiologia , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Prevenção Secundária , Resultado do Tratamento
3.
Free Radic Biol Med ; 141: 299-309, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31265876

RESUMO

OBJECTIVE: Carbon monoxide (CO) releasing molecule (CORM)-3, a water-soluble CORM, has protective effects against inflammatory and ischemia/reperfusion injury. We determined the effect of CORM-3 against neuronal pyroptosis in a model of hemorrhagic shock and resuscitation (HSR) in rats via mitochondrial regulation. METHODS: Rats were treated with CORM-3 (4 mg/kg) in vitro after HSR. We measured cortical CO content 3-24 h after HSR; assessed neuronal pyroptosis, mitochondrial morphology, ROS production, and mitochondrial membrane potential at 12 h after HSR; and evaluated brain magnetic resonance imaging at 24 h after HSR and learning ability 30 days after HSR. We also measured soluble guanylate-cyclase (sGC)-cyclic guanosine monophosphate (cGMP) signaling pathway activity using a blocker of sGC, NS2028, and 125I-cGMP assay. RESULTS: Among rats that underwent HSR, CORM-3-treated rats had more CO in the cortical tissue than sham- and iCORM-3-treated rats. CORM-3-treated rats had significantly less neuronal pyroptosis in the cortical tissue; higher sGC activity and cGMP content; lower ROS production; better mitochondrial morphology, function, and membrane potential; and enhanced learning/memory ability than HSR-treated rats. However, these neuroprotective effects of CORM-3 were partially inhibited by NS2028. CONCLUSION: CORM-3 may alleviate neuronal pyroptosis and improve neurological recovery in HSR through mitochondrial regulation mediated by the sGC-cGMP pathway. Thus, CO administration could be a promising therapeutic strategy for hemorrhagic shock.

4.
Ying Yong Sheng Tai Xue Bao ; 25(6): 1652-60, 2014 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-25223020

RESUMO

Evapotranspiration (ET) is an important parameter of agriculture, meteorology and hydrology research, and also an important part of the global hydrological cycle. This paper applied the improved DHSVM distributed hydrological model to estimate daily ET of Tahe area in 2007 using leaf area index and other surface data extracted TM remote sensing data, and slope, aspect and other topographic indices obtained by using the digital elevation model. The relationship between daily ET and daily watershed outlet flow was built by the BP neural network, and a water balance equation was established for the studied watershed, together to test the accuracy of the estimation. The results showed that the model could be applied in the study area. The annual total ET of Tahe watershed was 234.01 mm. ET had a significant seasonal variation. The ET had the highest value in summer and the average daily ET value was 1.56 mm. The average daily ET in autumn and spring were 0.30, 0.29 mm, respectively, and winter had the lowest ET value. Land cover type had a great effect on ET value, and the broadleaf forest had a higher ET ability than the mixed forest, followed by the needle leaf forest.


Assuntos
Florestas , Transpiração Vegetal , China , Clima , Modelos Teóricos , Folhas de Planta , Estações do Ano
5.
Ying Yong Sheng Tai Xue Bao ; 24(11): 3199-206, 2013 Nov.
Artigo em Chinês | MEDLINE | ID: mdl-24564150

RESUMO

Leaf inclination angle distribution directly decides the amount of radiation interception by vegetation canopy, and also, decides the size and direction of the incident radiation, being the key parameter in quantitative remote sensing. This paper simulated the leaf inclination angle distribution of the main tree species in Daxing'an Mountains forest region based on the Campbell ellipsoid distribution model and iterative method, and quantitatively analyzed the fitting results of canopy with and without leaf stratification as well as the effects of tree age group on the leaf inclination angle distribution. For the test 6 main tree species, the leaf inclination angle distribution was in planophile shape, and the mean leaf inclination angle was smaller for coniferous tree than for broadleaved tree. Whether with or without stratify, the fitting result and the measured result were basically identical. For Betula platyphylla and Larix gmelinii, the correlation coefficient between the simulated and measured values was 0.8268 and 0.8192, and the root mean square error was 3.7% and 4.3% respectively, indicating that the Campbell model was reliable applied for forest canopy. Considering the effects of tree age group, though the leaf inclination angle distribution trend with leaf stratification had no correlation with age group, the mean leaf inclination angle of young L. gmelinii was relatively smaller than that mature one, suggesting that age group had positive effects on the numerical design of leaf inclination angle distribution and negative effects on the numerical design of extinction coefficient.


Assuntos
Modelos Teóricos , Folhas de Planta/anatomia & histologia , Folhas de Planta/efeitos da radiação , Árvores/anatomia & histologia , Betula/anatomia & histologia , China , Simulação por Computador , Ecossistema , Pinus/anatomia & histologia , Tecnologia de Sensoriamento Remoto/métodos
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