Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 31
Filtrar
1.
J Emerg Med ; 66(5): e619-e631, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38556374

RESUMO

BACKGROUND: Timely diagnosis of acute intestinal necrosis (AIN) is lifesaving, but challenging due to unclear clinical presentation. D-lactate has been proposed as an AIN biomarker. OBJECTIVES: We aimed to test the diagnostic performance in a clinical setting. METHODS: We performed a cross-sectional prospective study, including all adult patients with acute referral to a single tertiary gastrointestinal surgical department during 2015-2016 and supplemented by enrollment of high-risk in-hospital patients suspected of having AIN during 2016-2019. AIN was verified intraoperatively, and D-lactate was analyzed using an automatic spectrophotometric set-up. A D-lactate cut-off for AIN was estimated using the receiver operating characteristic curve. The performance according to patient subgroups was estimated using the area under the receiver operating characteristic curve (AUC). Given the exploratory nature of this study, a formal power calculation was not feasible. RESULTS: Forty-four AIN patients and 2914 controls were enrolled. The D-lactate cut-off was found to be 0.0925 mM. Due to lipemic interference, D-lactate could not be quantified in half of the patients, leaving 23 AIN patients and 1456 controls for analysis. The AUC for the diagnosis of AIN by D-lactate was 0.588 (95% confidence interval 0.475-0.712), with a sensitivity of 0.261 and specificity of 0.892. Analysis of high-risk patients showed similar results (AUC 0.579; 95% confidence interval 0.422-0.736). CONCLUSION: D-lactate showed low sensitivity for AIN in both average-risk and high-risk patients. Moreover, lipemic interference precluded valid spectrophotometric assessment of D-lactate in half of the patients, further disqualifying the clinical utility of D-lactate as a diagnostic marker for AIN.


Assuntos
Biomarcadores , Ácido Láctico , Necrose , Humanos , Estudos Transversais , Estudos Prospectivos , Masculino , Feminino , Biomarcadores/sangue , Biomarcadores/análise , Ácido Láctico/sangue , Ácido Láctico/análise , Pessoa de Meia-Idade , Idoso , Adulto , Curva ROC , Doença Aguda
2.
J Robot Surg ; 18(1): 31, 2024 Jan 17.
Artigo em Inglês | MEDLINE | ID: mdl-38231282

RESUMO

The objective of this study was to evaluate the effect of low pneumoperitoneum pressure (Pnp) on renal function and renal injury biomarkers during robot-assisted radical prostatectomy (RARP). A single-centre, triple-blinded, randomised clinical trial was conducted with 98 patients undergoing RARP, who were assigned to either standard Pnp of 12 mmHg or low Pnp of 7 mmHg. The primary outcome was urinary neutrophil gelatinase-associated lipocalin (u-NGAL), and several other kidney injury biomarkers were assessed as secondary outcomes. Acute kidney injury (AKI) was evaluated using the Kidney Disease Improving Global Outcomes (KDIGO) criteria, the gold standard method for defining AKI. The trial was registered on ClinicalTrials.gov (NCT04755452). Patients in the low Pnp group had significantly lower levels of u-NGAL (mean difference - 39.9, 95% CI - 73.7 to - 6.1, p = 0.02) compared to the standard Pnp group. No significant differences were observed for other urinary biomarkers. Interestingly, there was a significant difference in intraoperative urine production between the groups (low Pnp median: 200 mL, IQR: 100-325 vs. standard Pnp median: 100 mL, IQR: 50-200, p = 0.01). Similarly, total postoperative urine production also varied significantly (low Pnp median: 1325 mL, IQR: 1025-1800 vs. standard Pnp median: 1000 mL, IQR: 850-1287, p = 0.001). The occurrence of AKI, as defined by the KDIGO criteria, did not differ significantly between the groups. Low Pnp during RARP resulted in lower u-NGAL levels, suggesting a potential benefit in terms of reduced renal injury. However, the lack of a notable difference in AKI as defined by the KDIGO criteria indicates that the clinical significance of this finding may be limited. Further research is needed to validate and expand on these results, ultimately defining the optimal Pnp strategy for RARP and improving patient outcomes.


Assuntos
Injúria Renal Aguda , Pneumoperitônio , Procedimentos Cirúrgicos Robóticos , Robótica , Masculino , Humanos , Lipocalina-2 , Pneumoperitônio/etiologia , Procedimentos Cirúrgicos Robóticos/métodos , Prostatectomia/efeitos adversos , Injúria Renal Aguda/diagnóstico , Injúria Renal Aguda/etiologia , Rim/cirurgia , Biomarcadores
3.
NPJ Parkinsons Dis ; 9(1): 164, 2023 Dec 13.
Artigo em Inglês | MEDLINE | ID: mdl-38092806

RESUMO

Alpha-synuclein (α-syn) aggregation and immune activation represent hallmark pathological events in Parkinson's disease (PD). The PD-associated immune response encompasses both brain and peripheral immune cells, although little is known about the immune proteins relevant for such a response. We propose that the upregulation of CD163 observed in blood monocytes and in the responsive microglia in PD patients is a protective mechanism in the disease. To investigate this, we used the PD model based on intrastriatal injections of murine α-syn pre-formed fibrils in CD163 knockout (KO) mice and wild-type littermates. CD163KO females revealed an impaired and differential early immune response to α-syn pathology as revealed by immunohistochemical and transcriptomic analysis. After 6 months, CD163KO females showed an exacerbated immune response and α-syn pathology, which ultimately led to dopaminergic neurodegeneration of greater magnitude. These findings support a sex-dimorphic neuroprotective role for CD163 during α-syn-induced neurodegeneration.

4.
Environ Health Perspect ; 131(11): 117003, 2023 11.
Artigo em Inglês | MEDLINE | ID: mdl-37909725

RESUMO

BACKGROUND: Mechanisms for how environmental chemicals might influence pain has received little attention. Epidemiological studies suggest that environmental factors such as pollutants might play a role in migraine prevalence. Potential targets for pollutants are the transient receptor potential (TRP) channels ankyrin 1 (TRPA1) and vanilloid 1 (TRPV1), which on activation release pain-inducing neuropeptide calcitonin gene-related peptide (CGRP). OBJECTIVE: In this study, we aimed to examine the hypothesis that environmental pollutants via TRP channel signaling and subsequent CGRP release trigger migraine signaling and pain. METHODS: A calcium imaging-based screen of environmental chemicals was used to investigate activation of migraine pain-associated TRP channels TRPA1 and TRPV1. Based on this screen, whole-cell patch clamp and in silico docking were performed for the pesticide pentachlorophenol (PCP) as proof of concept. Subsequently, PCP-mediated release of CGRP and vasodilatory responses of cerebral arteries were investigated. Finally, we tested whether PCP could induce a TRPA1-dependent induction of cutaneous hypersensitivity in vivo in mice as a model of migraine-like pain. RESULTS: A total of 16 out of the 52 screened environmental chemicals activated TRPA1 at 10 or 100µM. None of the investigated compounds activated TRPV1. Using PCP as a model of chemical interaction with TRPA1, in silico molecular modeling suggested that PCP is stabilized in a lipid-binding pocket of TRPA1 in comparison with TRPV1. In vitro, ex vivo, and in vivo experiments showed that PCP induced calcium influx in neurons and resulted in a TRPA1-dependent CGRP release from the brainstem and dilation of cerebral arteries. In a mouse model of migraine-like pain, PCP induced a TRPA1-dependent increased pain response (Ntotal=144). DISCUSSION: Here we show that multiple environmental pollutants interact with the TRPA1-CGRP migraine pain pathway. The data provide valuable insights into how environmental chemicals can interact with neurobiology and provide a potential mechanism for putative increases in migraine prevalence over the last decades. https://doi.org/10.1289/EHP12413.


Assuntos
Poluentes Ambientais , Transtornos de Enxaqueca , Canais de Potencial de Receptor Transitório , Camundongos , Animais , Canal de Cátion TRPA1/fisiologia , Peptídeo Relacionado com Gene de Calcitonina/metabolismo , Cálcio/metabolismo , Xenobióticos , Canais de Potencial de Receptor Transitório/metabolismo , Transtornos de Enxaqueca/metabolismo , Dor , Poluentes Ambientais/toxicidade
5.
J Spinal Cord Med ; : 1-11, 2023 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-37534922

RESUMO

OBJECTIVE: We recently demonstrated that upper-body rowing exercise (UBROW) improved aerobic fitness in individuals with spinal cord injury (SCI), with no effect on traditional cardiometabolic risk factors. Here, we tested the hypothesis that the exercise-induced increase in aerobic fitness was maintained at 6-month (6M) follow-up. DESIGN: Six-month follow-up. SETTING: University/hospital. PARTICIPANTS: Seventeen wheelchair-dependent participants with SCI. INTERVENTIONS: 12-week of exercise training (UBROW) or control (CON). OUTCOME MEASURES: Aerobic fitness (POpeak and V̇O2peak), body composition, blood pressure, and blood biomarkers of cardiometabolic risk were assessed at 6M follow-up and compared to baseline (BL) and immediately post-intervention (12-week). Minutes of mild, moderate, and heavy intensity leisure time physical activity (LTPA) were assessed by self-report. RESULTS: Fourteen participants returned at 6M follow-up (CON, n = 6; UBROW, n = 8). In UBROW, POpeak (median (Q1-Q3)) increased from BL (70 W (37-84)) to 12-week (77 W (58-109), P = 0.01) and 6M follow-up (81 W (51-96), P = 0.01), with no difference between 12-week and 6M follow-up (P = 0.21). Similarly, V̇O2peak increased from BL (15.4 ml/kg/min (10.5-19.4)) to 12-week (16.6 ml/kg/min (12.8-21.3), P = 0.01) with no difference between 12-week and 6M follow-up (16.3 ml/kg/min (12.9-19.7), P = 0.74). No differences were found in CON for either POpeak (P = 0.22) or V̇O2peak (P = 0.27). There were no changes over time in traditional cardiometabolic risk factors or for minutes of different LTPA intensities. CONCLUSION: We demonstrate that improvements in aerobic fitness are maintained for at least six months after completion of a 12-week exercise intervention, supporting the use of periodic exercise interventions to boost aerobic fitness level in individuals with SCI.Trial registration: ClinicalTrials.gov identifier: NCT04390087..

6.
Br J Sociol ; 74(3): 402-418, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36908000

RESUMO

Research on cultural stratification often draws on Bourdieu's misrecognition model to interpret socioeconomic gradients in cultural tastes and participation. In this model, an assumed cultural hierarchy leads individuals to adopt cultural tastes and behaviours whose status is congruent with that of their socioeconomic position (SEP). Yet, this assumed cultural hierarchy remains opaque. In this paper, we derive and test three empirical implications of the cultural hierarchy: (1) cultural activities have different status (recognition); (2) individuals in high and low SEPs have similar perceptions of the status of cultural activities (necessary condition for misrecognition); and (3) individuals prefer and engage in cultural activities whose status matches that of their SEP (status congruence). We collected survey data in Denmark and find that cultural activities differ in terms of perceived status (e.g., opera has higher perceived status than flea market), status perceptions are similar in high- and low-SEP groups and individuals prefer activities whose status matches that of their SEP. These results are consistent with the idea that a cultural hierarchy exists that sustains SEP gradients in cultural tastes and participation.


Assuntos
Classe Social , Paladar , Humanos , Inquéritos e Questionários , Fatores Socioeconômicos
7.
J Vis Exp ; (183)2022 05 16.
Artigo em Inglês | MEDLINE | ID: mdl-35635478

RESUMO

Calcitonin gene-related peptide (CGRP) was first discovered in the 1980s as a splice variant from the calcitonin gene. Since its discovery, its role in migraine pathophysiology has been well established, first by its potent vasodilator properties and subsequently by its presence and function as a neurotransmitter in the sensory trigeminovascular system. The migraine-provoking ability of CGRP gave support to the pharma industry to develop monoclonal antibodies and antagonists inhibiting the effect of CGRP. A new treatment paradigm has proven effective in the prophylactic treatment of migraine. One of the useful tools to further understand migraine mechanisms is the ex vivo model of CGRP release from the trigeminovascular system. It is a relatively simple method that can be used with various pharmacological tools to achieve know-how to further develop new effective migraine treatments. The present protocol describes a CGRP release model and the technique to quantify the effect of pharmacological agents on the amount of CGRP released from the trigeminovascular system in rodents. A procedure describing the experimental approach from euthanasia to the measurement of protein levels is provided. The essential isolation of the trigeminal ganglion and the trigeminal nucleus caudalis from both mice and rats and the preparation of rat dura mater are described in detail. Furthermore, representative results from both species (rats and mice) are presented. The technique is a key tool to investigate the molecular mechanisms involved in migraine pathophysiology by using various pharmacological compounds and genetically modified animals.


Assuntos
Peptídeo Relacionado com Gene de Calcitonina , Transtornos de Enxaqueca , Animais , Calcitonina/metabolismo , Peptídeo Relacionado com Gene de Calcitonina/metabolismo , Camundongos , Transtornos de Enxaqueca/tratamento farmacológico , Ratos , Roedores/metabolismo , Gânglio Trigeminal/metabolismo
8.
Brain ; 145(7): 2450-2460, 2022 07 29.
Artigo em Inglês | MEDLINE | ID: mdl-35136961

RESUMO

Calcitonin gene-related peptide (CGRP)-antagonizing drugs represent a major advance in migraine treatment. However, up to 50% of patients do not benefit from monoclonal antibodies against CGRP or its receptor. Here, we test the hypothesis that a closely related peptide, pituitary adenylate cyclase-activating peptide (PACAP-38), works independently of CGRP and thus might represent a new, alternative drug target. To understand differences in CGRP- and PACAP-mediated migraine pain, we used mouse models of provoked migraine-like pain based on multiple stimulations and subsequent measurement of tactile sensitivity response with von Frey filaments. Genetically modified mice lacking either functional CGRP receptors (Ramp1 knockout) or TRPA1 channels (Trpa1 knockout) were used together with CGRP-targeting antibodies and chemical inhibitors in wild-type mice (ntotal = 299). Ex vivo myograph studies were used to measure dilatory responses to CGRP and PACAP-38 in mouse carotid arteries. PACAP-38 provoked significant hypersensitivity and dilated the carotid arteries independently of CGRP. In contrast, glyceryl trinitrate-induced hypersensitivity is dependent on CGRP. Contrary to previous results with the migraine-inducing substances glyceryl trinitrate, cilostazol and levcromakalim, PACAP-38-induced hypersensitivity worked only partially through inhibition of ATP-sensitive potassium channels. Using multiple migraine-relevant models, these findings establish the PACAP-38 pathway as distinct from other migraine provoking pathways such as CGRP and glyceryl trinitrate. PACAP antagonism may therefore be a novel therapeutic target of particular interest in patients unresponsive to CGRP-antagonizing drugs.


Assuntos
Peptídeo Relacionado com Gene de Calcitonina , Transtornos de Enxaqueca , Animais , Peptídeo Relacionado com Gene de Calcitonina/metabolismo , Modelos Animais de Doenças , Camundongos , Transtornos de Enxaqueca/induzido quimicamente , Nitroglicerina/efeitos adversos , Dor/metabolismo , Polipeptídeo Hipofisário Ativador de Adenilato Ciclase/metabolismo
9.
Cephalalgia ; 42(2): 93-107, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-34816764

RESUMO

BACKGROUND: Opening of KATP channels by systemic levcromakalim treatment triggers attacks in migraine patients and hypersensitivity to von Frey stimulation in a mouse model. Blocking of these channels is effective in several preclinical migraine models. It is unknown in what tissue and cell type KATP-induced migraine attacks are initiated and which KATP channel subtype is targeted. METHODS: In mouse models, we administered levcromakalim intracerebroventricularly, intraperitoneally and intraplantarily and compared the nociceptive responses by von Frey and hotplate tests. Mice with a conditional loss-of-function mutation in the smooth muscle KATP channel subunit Kir6.1 were given levcromakalim and GTN and examined with von Frey filaments. Arteries were tested for their ability to dilate ex vivo. mRNA expression, western blotting and immunohistochemical stainings were made to identify relevant target tissue for migraine induced by KATP channel opening. RESULTS: Systemic administration of levcromakalim induced hypersensitivity but central and local administration provided antinociception respectively no effect. The Kir6.1 smooth muscle knockout mouse was protected from both GTN and levcromakalim induced hypersensitivity, and their arteries had impaired dilatory response to the latter. mRNA and protein expression studies showed that trigeminal ganglia did not have significant KATP channel expression of any subtype, whereas brain arteries and dura mater primarily expressed the Kir6.1 + SUR2B subtype. CONCLUSION: Hypersensitivity provoked by GTN and levcromakalim in mice is dependent on functional smooth muscle KATP channels of extracerebral origin. These results suggest a vascular contribution to hypersensitivity induced by migraine triggers.


Assuntos
Canais KATP , Transtornos de Enxaqueca , Trifosfato de Adenosina , Animais , Cromakalim/efeitos adversos , Modelos Animais de Doenças , Humanos , Canais KATP/genética , Canais KATP/metabolismo , Camundongos , Camundongos Knockout , Músculo Liso/metabolismo , RNA Mensageiro
10.
Cephalalgia ; 41(14): 1413-1426, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34407650

RESUMO

BACKGROUND: Knowledge of exact signalling events during migraine attacks is lacking. Various substances are known to trigger migraine attacks in patients and calcitonin gene-related peptide antagonising drugs are effective against migraine pain. Here, we investigated the signalling pathways involved in three different mouse models of provoked migraine and relate them to calcitonin gene-related peptide and other migraine-relevant targets. METHODS: In vivo mouse models of glyceryl trinitrate-, cilostazol- and levcromakalim-induced migraine were applied utilising tactile sensitivity to von Frey filaments as measuring readout. Signalling pathways involved in the three models were dissected by use of specific knockout mice and chemical inhibitors. In vivo results were supported by ex vivo wire myograph experiments measuring arterial dilatory responses and ex vivo calcitonin gene-related peptide release from trigeminal ganglion and trigeminal nucleus caudalis from mice. RESULTS: Glyceryl trinitrate-induced hypersensitivity was dependent on both prostaglandins and transient receptor potential cation channel, subfamily A, member 1, whereas cilostazol- and levcromakalim-induced hypersensitivity were independent of both. All three migraine triggers activated calcitonin gene-related peptide signalling, as both receptor antagonism and antibody neutralisation of calcitonin gene-related peptide were effective inhibitors of hypersensitivity in all three models. Stimulation of trigeminal ganglia and brain stem tissue samples with cilostazol and levcromakalim did not result in release of calcitonin gene-related peptide, and vasodilation following levcromakalim stimulation was independent of CGRP receptor antagonism. CONCLUSION: The mouse models of glyceryl trinitrate-, cilostazol- and levcromakalim- induced migraine all involve calcitonin gene-related peptide signalling in a complex interplay between different cell/tissue types. These models are useful in the study of migraine mechanisms.


Assuntos
Peptídeo Relacionado com Gene de Calcitonina , Transtornos de Enxaqueca , Animais , Cilostazol/toxicidade , Cromakalim , Humanos , Camundongos , Camundongos Knockout , Gânglio Trigeminal
11.
Adv Pharmacol ; 91: 185-211, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34099108

RESUMO

Tumor-associated macrophages are among the most abundant non-cancerous cells in the tumor microenvironment and in many cancers macrophage infiltration into the tumor is associated with poor prognosis. Macrophages contribute to tumor development by promoting angiogenesis and immune suppression, and display remarkable phenotypic heterogeneity in the tumor microenvironment. Therapeutic strategies targeting macrophages that currently are in clinical development are mainly focused on a general depletion of tumor-associated macrophages, either by targeting the CSF-1/CSF-1R axis or by inhibiting macrophage recruitment by blocking CCR2/CCL2 signaling. Despite good pre-clinical response rates the treatment strategies focusing on general macrophage targeting have only shown limited clinical success and new approaches that target specific subsets of tumo-associated macrophages are emerging. This chapter will briefly present the functions and heterogeneity of tumor-associated macrophages and provide an overview of the current state of clinical development for pan-targeting strategies as well as discuss new strategies for targeting specific macrophage subsets for future anti-tumor immunotherapies.


Assuntos
Neoplasias , Macrófagos Associados a Tumor , Humanos , Macrófagos , Neoplasias/tratamento farmacológico , Transdução de Sinais , Microambiente Tumoral
12.
Nature ; 592(7856): 799-803, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33854232

RESUMO

Mammalian development, adult tissue homeostasis and the avoidance of severe diseases including cancer require a properly orchestrated cell cycle, as well as error-free genome maintenance. The key cell-fate decision to replicate the genome is controlled by two major signalling pathways that act in parallel-the MYC pathway and the cyclin D-cyclin-dependent kinase (CDK)-retinoblastoma protein (RB) pathway1,2. Both MYC and the cyclin D-CDK-RB axis are commonly deregulated in cancer, and this is associated with increased genomic instability. The autophagic tumour-suppressor protein AMBRA1 has been linked to the control of cell proliferation, but the underlying molecular mechanisms remain poorly understood. Here we show that AMBRA1 is an upstream master regulator of the transition from G1 to S phase and thereby prevents replication stress. Using a combination of cell and molecular approaches and in vivo models, we reveal that AMBRA1 regulates the abundance of D-type cyclins by mediating their degradation. Furthermore, by controlling the transition from G1 to S phase, AMBRA1 helps to maintain genomic integrity during DNA replication, which counteracts developmental abnormalities and tumour growth. Finally, we identify the CHK1 kinase as a potential therapeutic target in AMBRA1-deficient tumours. These results advance our understanding of the control of replication-phase entry and genomic integrity, and identify the AMBRA1-cyclin D pathway as a crucial cell-cycle-regulatory mechanism that is deeply interconnected with genomic stability in embryonic development and tumorigenesis.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Ciclina D/metabolismo , Instabilidade Genômica , Fase S , Animais , Linhagem Celular , Proliferação de Células , Quinase 1 do Ponto de Checagem/antagonistas & inibidores , Quinases Ciclina-Dependentes/metabolismo , Replicação do DNA , Regulação da Expressão Gênica no Desenvolvimento , Genes Supressores de Tumor , Humanos , Camundongos , Camundongos Knockout , Mutações Sintéticas Letais
13.
BMC Res Notes ; 14(1): 157, 2021 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-33910634

RESUMO

OBJECTIVE: Cardiac regeneration in the axolotl has been found to rely on the innate immune system, and especially macrophages have been demonstrated to play a vital role in regulating the regenerative process. In this study we wanted to induce a pro- and anti-inflammatory milieu in the axolotl during heart regeneration to test the resilience of the regenerative response. RESULTS: This was induced via repeated intrapericardial injections of lipopolysaccharide or prednisolone during a 40-day regeneration period in order to challenge the presumably fine-tuned inflammatory response that normally facilitates regeneration. We observed a local and systemic leucocyte response to pro- and anti-inflammatory stimulation, but we found cardiac regeneration to be structurally and functionally unaffected.


Assuntos
Ambystoma mexicanum , Lipopolissacarídeos , Animais , Contagem de Leucócitos , Macrófagos , Prednisolona/farmacologia
14.
Scand J Clin Lab Invest ; 81(4): 312-317, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33879006

RESUMO

Intestinal infarction is the fast-evolving endpoint of impaired blood perfusion to an intestinal segment which may have fatal outcome. Early diagnosis and treatment within 6 h reduce mortality. Currently, d-lactate is a promising biomarker, however, not available in the acute clinical setting. The aim of this study is implementation of d-lactate analysis in a routine clinical setting. We used a spectrophotometric method, based on enzymatic oxidation of d-lactate by d-lactate dehydrogenase (D-LDH) coupled to the reduction of nicotinamide-adenine dinucleotide (NAD+). The amount of NADH formed in this reaction is equivalent to d-lactate. The primary concern in this method is interfering NADH formed by oxidation of l-lactate by l-lactate dehydrogenase (L-LDH). A commercially available kit for d-lactate measurement was implemented on our existing automated routine laboratory equipment including pH-inactivation of L-LDH. Our setup fulfilled clinical quality goals. We were able to measure d-lactate with an acceptable performance of the analysis and a short turn-around time. The method can be used to distinguish between the expected cut-off for intestinal ischemia around 0.3 mM and the upper reference limit of 0.05 mM. With a turnaround time of just 9 min, the analysis has potential as a readily available detection of circulating d-lactate for early diagnosis of intestinal ischemia.


Assuntos
Análise Química do Sangue/métodos , Ácido Láctico/sangue , Automação Laboratorial , Emulsões/administração & dosagem , Humanos , Concentração de Íons de Hidrogênio , L-Lactato Desidrogenase/sangue , Limite de Detecção , Isquemia Mesentérica/sangue , NAD/metabolismo , Fosfolipídeos/administração & dosagem , Kit de Reagentes para Diagnóstico , Reprodutibilidade dos Testes , Óleo de Soja/administração & dosagem , Espectrofotometria
15.
Biomedicines ; 9(2)2021 Feb 18.
Artigo em Inglês | MEDLINE | ID: mdl-33670624

RESUMO

High-resolution flow cytometers (hFCM) are used for the detection of extracellular vesicles (EV) in various biological fluids. Due to the increased sensitivity of hFCM, new artifacts with the potential of interfering with data interpretation are introduced, such as detection of antibody aggregates. The aim of this study was to investigate the extent of aggregates in labels commonly used for the characterization of EVs by hFCM. Furthermore, we aimed to compare the efficacy of centrifugation and filtering treatments to remove aggregates, as well as to quantify the effect of the treatments in reducing aggregates. For this purpose, we labeled phosphate buffered saline (PBS) with fluorescently conjugated protein labels and antibodies after submitting them to 5, 10, or 30 min centrifugation, filtering or washed filtering. We investigated samples by hFCM and quantified the amount of aggregates found in PBS labeled with untreated and pre-treated labels. We found a varying amount of aggregates in all labels investigated, and further that filtering is most efficient in removing all but the smallest aggregates. Filtering protein labels can reduce the extent of aggregates; however, how much remains depends on the specific labels and their combination. Therefore, it is still necessary to include appropriate controls in a hFCM study of EVs.

16.
Nat Commun ; 11(1): 4709, 2020 09 18.
Artigo em Inglês | MEDLINE | ID: mdl-32948765

RESUMO

Glioblastoma cancer-stem like cells (GSCs) display marked resistance to ionizing radiation (IR), a standard of care for glioblastoma patients. Mechanisms underpinning radio-resistance of GSCs remain largely unknown. Chromatin state and the accessibility of DNA lesions to DNA repair machineries are crucial for the maintenance of genomic stability. Understanding the functional impact of chromatin remodeling on DNA repair in GSCs may lay the foundation for advancing the efficacy of radio-sensitizing therapies. Here, we present the results of a high-content siRNA microscopy screen, revealing the transcriptional elongation factor SPT6 to be critical for the genomic stability and self-renewal of GSCs. Mechanistically, SPT6 transcriptionally up-regulates BRCA1 and thereby drives an error-free DNA repair in GSCs. SPT6 loss impairs the self-renewal, genomic stability and tumor initiating capacity of GSCs. Collectively, our results provide mechanistic insights into how SPT6 regulates DNA repair and identify SPT6 as a putative therapeutic target in glioblastoma.


Assuntos
Reparo do DNA , Instabilidade Genômica , Glioblastoma/genética , Células-Tronco Neoplásicas , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Animais , Apoptose , Proteína BRCA1 , Neoplasias Encefálicas/genética , Pontos de Checagem do Ciclo Celular , Linhagem Celular Tumoral , Feminino , Regulação Neoplásica da Expressão Gênica , Técnicas de Silenciamento de Genes , Inativação Gênica , Glioblastoma/patologia , Células HEK293 , Xenoenxertos , Humanos , Camundongos , Camundongos Endogâmicos BALB C , Células-Tronco Neoplásicas/patologia , RNA Interferente Pequeno/genética , Tolerância a Radiação , Radiação Ionizante , Transcriptoma
17.
Health Soc Care Community ; 28(6): 2140-2149, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32483900

RESUMO

Frailty is associated with several negative health outcomes, such as readmissions to hospital. Physical exercise, including strength training and nutritional optimisation are essential parts of documented interventions for frail older people in preventing or minimising frailty. Further knowledge is necessary to ensure feasible and successful interventions encompassing both physical exercise and nutritional optimisation. The aim of this qualitative study was to investigate the perspectives of health professionals on which factors may affect interventions, including physical exercise and nutrition, for frail older people in relation to discharge after acute admission to hospital. Data were gathered in two semi-structured focus groups, totalling 11 health professionals working with frail older people in a Danish university hospital and a municipality. The sampling of participants was purposive and the interviews were facilitated by a semi-structured interview guide. Data were analysed applying a six-step data-driven thematic analysis. Findings showed that health professionals experienced working with nutritional optimisation and physical exercise within a frail older population as challenging, and they mostly used extrinsic motivation, such as incentives, deals or intensified messages, as external factors in their approaches as to affect specific behaviours. A discourse on the importance of activity- and functional training was prevalent, while diverging perspectives were present in relation to strength training, which was considered less feasible or meaningful in a community-dwelling setting. Organisational barriers such as communication between sectors and time limitations affected negatively the work of health professionals, as they hindered co-ordinated and adequate interventions from the health professionals. Findings and theory-based knowledge indicate that health professionals should work towards a person-centred approach, which includes goal-setting, to improve physical training and nutritional interventions for frail older people. Furthermore, health professionals may need more support in order to incorporate strength training in interventions. In addition to this, improved co-ordination between sectors is warranted.


Assuntos
Dietoterapia/métodos , Terapia por Exercício/métodos , Fragilidade/terapia , Pessoal de Saúde/psicologia , Alta do Paciente , Dinamarca , Exercício Físico , Feminino , Grupos Focais , Humanos , Vida Independente , Estado Nutricional , Pesquisa Qualitativa , Fatores de Tempo
18.
Nat Commun ; 9(1): 5396, 2018 12 19.
Artigo em Inglês | MEDLINE | ID: mdl-30568233

RESUMO

This Article contains an error in the spelling of the author Kjeld Møllgård, which is incorrectly given as Kjeld Møllgaard. The error has not been fixed in the original PDF and HTML versions of the Article.

19.
Health Soc Care Community ; 26(6): 898-907, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30047622

RESUMO

Health-risk behaviour like physical inactivity is more evident in deprived neighbourhoods than in nondeprived neighbourhoods, and in the former knowledge is lacking as to what causes effects in interventions on physical activity. A possible contribution to physical activity interventions is community engagement, which has been shown to be effective for changing health-risk behaviour, but more knowledge is needed on "the active ingredients" or mechanisms that make interventions work. The aim of this study was to give more insight into the possible mechanisms within an intervention on physical activity using community engagement. The study applied a theory-based evaluation approach using theory of change to uncover the underlying mechanisms of a community-based fitness centre in a deprived Danish neighbourhood. Data were gathered from documents about the intervention, semistructured interviews with three front-line workers on the intervention and ten residents participating in the centre as either volunteer instructors or members. The following mechanisms of the intervention to improve participation and health were anticipated by the front-line workers; the creation of meaningful communities through social interaction, the presence of relatable role models, residents taking responsibility and feeling co-ownership and the experience of being of value as an instructor. Interviews with members and volunteer instructors showed that the anticipated mechanisms did facilitate participation and improved health; however, with some individual variations and with the physical and mental benefits of the particular activities also functioning as mechanisms for participation and engagement. Furthermore, the study found potential unintended consequences related to engagement, such as difficulties in balancing the needs of others with own needs. Findings indicate that both the social aspect and the activities should be prioritised, as should a continued focus on the inclusion of different residents in the area. Furthermore, unintended consequences should be considered and prevented through support for volunteering residents.


Assuntos
Participação da Comunidade/estatística & dados numéricos , Exercício Físico , Academias de Ginástica , Promoção da Saúde/métodos , Características de Residência , Dinamarca , Feminino , Humanos , Relações Interpessoais , Masculino , Apoio Social , Voluntários/estatística & dados numéricos
20.
Mol Oncol ; 12(3): 406-420, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29360266

RESUMO

Glioblastoma (GBM) ranks among the most lethal cancers, with current therapies offering only palliation. Inter- and intrapatient heterogeneity is a hallmark of GBM, with epigenetically distinct cancer stem-like cells (CSCs) at the apex. Targeting GSCs remains a challenging task because of their unique biology, resemblance to normal neural stem/progenitor cells, and resistance to standard cytotoxic therapy. Here, we find that the chromatin regulator, JmjC domain histone H3K36me2/me1 demethylase KDM2B, is highly expressed in glioblastoma surgical specimens compared to normal brain. Targeting KDM2B function genetically or pharmacologically impaired the survival of patient-derived primary glioblastoma cells through the induction of DNA damage and apoptosis, sensitizing them to chemotherapy. KDM2B loss decreased the GSC pool, which was potentiated by coadministration of chemotherapy. Collectively, our results demonstrate KDM2B is crucial for glioblastoma maintenance, with inhibition causing loss of GSC survival, genomic stability, and chemoresistance.


Assuntos
Antineoplásicos/administração & dosagem , Neoplasias Encefálicas/tratamento farmacológico , Resistencia a Medicamentos Antineoplásicos , Proteínas F-Box/metabolismo , Glioblastoma/tratamento farmacológico , Histona Desmetilases com o Domínio Jumonji/metabolismo , Células-Tronco Neoplásicas/metabolismo , Apoptose/efeitos dos fármacos , Astrócitos/metabolismo , Neoplasias Encefálicas/patologia , Linhagem Celular , Dano ao DNA/efeitos dos fármacos , Etoposídeo/administração & dosagem , Proteínas F-Box/genética , Glioblastoma/patologia , Histonas/metabolismo , Humanos , Histona Desmetilases com o Domínio Jumonji/genética , Lomustina/administração & dosagem , Lisina/metabolismo , Cultura Primária de Células
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...