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1.
Support Care Cancer ; 30(9): 7079-7098, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35416500

RESUMO

PURPOSE: Clear information and supportive care are necessary for patients with cancer to effectively manage their condition. Traditionally, healthcare professionals offer information and support via the so-called formal care route. In addition, research has found favorable effects of informal care provided by volunteer programs and informal "walk-in support centers." Less research has been done on initiatives that combine formal and complementary informal supportive care for patients with cancer. This systematic literature study aimed to discover (1) which types of initiatives are described in the literature, (2) what type of care they offer, and (3). how they are evaluated in terms of outcome measures. METHODS: We performed a systematic literature search of MEDLINE, Embase, PsycINFO, and CINAHL. Studies were included if the collaboration between one type of formal care together with one type of informal care was explicitly mentioned in the article. The search was not restricted to a specific cancer type. RESULTS: A total of 4869 records were retrieved and 18 studies were included. In most studies, the care provided consisted of emotional support for, and/or providing information to, patients and their families. Initiatives were evaluated with interviews and questionnaires. Patients with cancer reported that they were satisfied with the care offered, including information, social and emotional support, help with activities of daily living, and family-related issues. Volunteers reported that visits they made were experienced positive and rewarding and the volunteers were confident about their contribution to general healthcare. Some negative experiences were reported by volunteers, e.g., interference of their own cancer diagnosis with volunteer work. The importance of proper training was stressed. CONCLUSIONS: Initiatives combining formal and informal supportive care hold the potential of added value in terms of providing emotional support for, and providing information to, patients with cancer. Support and specific training for volunteers can be viewed as success factors in the involvement of volunteers in formal care practices.


Assuntos
Atividades Cotidianas , Neoplasias , Pessoal de Saúde , Humanos , Neoplasias/terapia , Inquéritos e Questionários , Voluntários
2.
Int J Mol Sci ; 23(1)2021 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-35008484

RESUMO

In arrhythmogenic cardiomyopathy (ACM) pathogenic variants are found in genes encoding desmosomal proteins and in non-desmosomal genes, such as phospholamban (PLN, p.Arg14del variant). Previous research showed that plakoglobin protein levels and localization in the cardiac tissue of ACM patients, and PLN p.Arg14del patients diagnosed with an ACM phenotype, are disturbed. Moreover, the effects of pathogenic variants in desmosomal genes are reflected in non-cardiac tissues like buccal mucosa cells (BMC) which could serve as a promising new and non-invasive tool to support diagnosis. We collected the BMC of 33 ACM patients, 17 PLN p.Arg14del patients and 34 controls, labelled the BMC with anti-plakoglobin antibodies at different concentrations, and scored their membrane labelling. We found that plakoglobin protein levels were significantly reduced in BMC obtained from diagnosed ACM patients and preclinical variant carriers when compared to controls. This effect was independent from age and sex. Moderate to strong correlations were found with the revised 2010 Task Force Criteria score which is commonly used for ACM diagnosis (rs = -0.67, n = 64, p < 0.0001 and rs = -0.71, n = 64, p < 0.0001). In contrast, plakoglobin scores in PLN p.Arg14del patients were comparable to controls (p > 0.209), which suggests differences in underlying etiology. However, for the individual diagnosis of the 'classical' ACM patient, this method might not be discriminative enough to distinguish true patients from variant carriers and controls, because of the high interindividual variability.


Assuntos
Displasia Arritmogênica Ventricular Direita/diagnóstico , Displasia Arritmogênica Ventricular Direita/patologia , Mucosa Bucal/patologia , Adulto , Displasia Arritmogênica Ventricular Direita/metabolismo , Proteínas de Ligação ao Cálcio/metabolismo , Desmossomos/metabolismo , Desmossomos/patologia , Progressão da Doença , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Mucosa Bucal/metabolismo , gama Catenina/metabolismo
3.
J Cell Mol Med ; 24(15): 8417-8429, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32573944

RESUMO

In the diseased and remodelled heart, increased activity and expression of Ca2+/ calmodulin-dependent protein kinase II (CaMKII), an excess of fibrosis, and a decreased electrical coupling and cellular excitability leads to disturbed calcium homeostasis and tissue integrity. This subsequently leads to increased arrhythmia vulnerability and contractile dysfunction. Here, we investigated the combination of CaMKII inhibition (using genetically modified mice expressing the autocamtide-3-related-peptide (AC3I)) together with eplerenone treatment (AC3I-Epler) to prevent electrophysiological remodelling, fibrosis and subsequent functional deterioration in a mouse model of chronic pressure overload. We compared AC3I-Epler mice with mice only subjected to mineralocorticoid receptor (MR) antagonism (WT-Epler) and mice with only CaMKII inhibition (AC3I-No). Our data show that a combined CaMKII inhibition together with MR antagonism mitigates contractile deterioration as was manifested by a preservation of ejection fraction, fractional shortening, global longitudinal strain, peak strain and contractile synchronicity. Furthermore, patchy fibrosis formation was reduced, potentially via inhibition of pro-fibrotic TGF-ß/SMAD3 signalling, which related to a better global contractile performance and a slightly depressed incidence of arrhythmias. Furthermore, the level of patchy fibrosis appeared significantly correlated to eplerenone dose. The addition of eplerenone to CaMKII inhibition potentiates the effects of CaMKII inhibition on pro-fibrotic pathways. As a result of the applied strategy, limiting patchy fibrosis adheres to a higher synchronicity of contraction and an overall better contractile performance which fits with a tempered arrhythmogenesis.


Assuntos
Proteína Quinase Tipo 2 Dependente de Cálcio-Calmodulina/metabolismo , Eplerenona/farmacologia , Antagonistas de Receptores de Mineralocorticoides/farmacologia , Receptores de Mineralocorticoides/metabolismo , Animais , Arritmias Cardíacas/metabolismo , Sinalização do Cálcio/efeitos dos fármacos , Modelos Animais de Doenças , Feminino , Fibrose/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Transdução de Sinais/efeitos dos fármacos , Proteína Smad3/metabolismo , Fator de Crescimento Transformador beta/metabolismo
4.
Europace ; 19(4): 518-528, 2017 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-28431070

RESUMO

Cardiac disease is the leading cause of death in the developed world. Ventricular arrhythmias associated with myocardial ischaemia and/or infarction are a major contributor to cardiovascular mortality, and require improved prevention and treatment. Drugs, devices, and radiofrequency catheter ablation have made important inroads, but have significant limitations ranging from incomplete success to undesired toxicities and major side effects. These limitations derive from the nature of the intervention. Drugs are frequently ineffective, target the entire heart, and often do not deal with the specific arrhythmia trigger or substrate. Devices can terminate rapid rhythms but at best indirectly affect the underlying disease, while ablation, even when appropriately targeted, induces additional tissue damage. In contrast, exploration of gene and cell therapies are expected to provide a targeted, non-destructive, and potentially regenerative approach to ischaemia- and infarction-related arrhythmias. Although these approaches are in the early stages of development, they carry substantial potential to advance arrhythmia prevention and treatment.


Assuntos
Arritmias Cardíacas/genética , Arritmias Cardíacas/terapia , Transplante de Células/tendências , Terapia Genética/tendências , Terapia de Alvo Molecular/tendências , Infarto do Miocárdio/genética , Infarto do Miocárdio/terapia , Arritmias Cardíacas/etiologia , Medicina Baseada em Evidências , Previsões , Marcação de Genes/tendências , Humanos , Infarto do Miocárdio/complicações , Resultado do Tratamento
5.
Eur J Psychotraumatol ; 15(1): 2341577, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38747113

RESUMO

Background: Literature points towards the potential benefits of the application of Eye Movement and Desensitization Processing (EMDR)-therapy for patients in the medical setting, with cancer and pain being among the domains it is applied to. The field of applying EMDR-therapy for patients treated in the medical setting has evolved to such an extent that it may be challenging to get a comprehensive overview.Objective: This systematic literature review aims to evaluate the use and effectiveness of Eye Movement Desensitization and Reprocessing (EMDR) therapy in patients treated in the medical setting.Methods: We performed a literature search following the PRISMA guidelines. Studies were included if the effectiveness of EMDR-therapy was assessed in adult patients treated in a medical setting. Excluded were patients exclusively suffering from a mental health disorder, without somatic comorbidity. A risk of bias analysis was performed. This review was registered on PROSPERO (CRD42022325238).Results: Eighty-seven studies, of which 26 (pilot)-RCTs were included and categorized in 14 medical domains. Additionally, three studies focusing on persistent physical complaints were included. Most evidence exists for its application in the fields of oncology, pain, and neurology. The overall appraisal of these studies showed at least moderate to high risks of bias. EMDR demonstrated effectiveness in reducing symptoms in 85 out of 87 studies. Notably, the occurrence of adverse events was rarely mentioned.Conclusions: Overall, outcomes seem to show beneficial effects of EMDR on reducing psychological and physical symptoms in patients treated in a medical setting. Due to the heterogeneity of reported outcomes, effect sizes could not be pooled. Due to the high risk of bias of the included studies, our results should be interpreted with caution and further controlled high-quality research is needed.


First overview on the use of EMDR for adult patients treated in the medical setting.EMDR seems beneficial in improving psychological and physical symptoms.Given the heterogeneity of studies and high risk of bias, further controlled studies are needed in this field.


Assuntos
Dessensibilização e Reprocessamento através dos Movimentos Oculares , Humanos , Neoplasias/terapia
6.
Cancer Med ; 13(10): e7211, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38785201

RESUMO

OBJECTIVE: To obtain insight into adaptation processes of redefining normality and its influencing factors in relatives of patients with advanced cancer. METHODS: An exploratory qualitative study among relatives of patients with advanced cancer was conducted. Participants were purposively recruited. Ten in-depth individual (relative only) and 16 dyad (relative and patient together) interviews were conducted, transcribed verbatim, and analyzed by means of thematic analysis, drawing on elements of grounded theory, combining both inductive and deductive elements. RESULTS: Two adaptation processes of (redefining) normality were identified: assimilation and accommodation. The latter was found to be the main way of adapting to new events. Assimilative coping strategies entailed "continuing to do the same activities as done before the disease," "difficulty accepting the situation," "avoiding to think about the disease," and "living in the short term." Accommodative strategies involved "arranging practical matters," "thinking about the future," "doing what is feasible," "engaging in new activities," "accepting the situation," "seeking distraction," "living in the short term," and "focusing on what truly matters in life." The interplay between the diagnosis and treatment of cancer, a deteriorating disease status, and the accompanying uncertainty about the future was of influence on the relatives' coping strategies. CONCLUSION: When the new situation is too divergent to assimilate, accommodation may be necessary for relatives to cope with the growing complexity of the consequences of their loved one's illness. Accommodative coping then involves accepting the changing reality and actively making the necessary adjustments to build resilience and cope with the new circumstances.


Assuntos
Adaptação Psicológica , Família , Neoplasias , Pesquisa Qualitativa , Humanos , Neoplasias/psicologia , Feminino , Masculino , Pessoa de Meia-Idade , Família/psicologia , Idoso , Adulto , Idoso de 80 Anos ou mais
7.
Artigo em Inglês | MEDLINE | ID: mdl-38191273

RESUMO

OBJECTIVES: Around 30% of patients with cancer suffer from psychosocial problems requiring formal care; however, these problems are often not identified. Support consultants may play a role in identifying these problems. This study investigates the feasibility of using validated screening instruments to assist support consultants in identifying psychosocial problems. METHODS: Prospective observational study focusing on patients visiting support consultants at hospital-affiliated centres for information and support. The feasibility of using screening instruments was assessed based on the percentage of patients willing to participate. For these patients, possible psychosocial problems were objectified, and referral to formal care was assessed. RESULTS: Out of 227 eligible patients at IntermeZZo, 48 participated (21.1%). At PATIO, over 141 consultations took place and 27 patients participated. Main reason for non-participation was that patients did not feel such a need. The majority showed elevated scores, indicating possible psychosocial problems and around half were referred. Respecting the individual needs of patients and offering them with what benefits them is crucial, including screening instruments does not match their needs nor did support consultants feel it was appropriate in certain cases. CONCLUSION: Given the low percentage of questionnaires administered, it does not seem feasible to systematically administer them to patients visiting support consultants.

8.
Artigo em Inglês | MEDLINE | ID: mdl-38471789

RESUMO

OBJECTIVES: Clear information and supportive care are necessary for oncology patients and their relatives to manage the disease (trajectory). Centres for information and support aim to address their needs by offering informal and non-medical formal services. This study evaluated whether the centres' services offered meet the needs of its visitors, and whether there is interest for these among oncology patients treated at affiliated hospitals. METHODS: In this participatory action research, interviews were conducted among visitors of two centres (Patient Information Center Oncology (PATIO) and IntermeZZo) and among patients treated at the affiliated hospitals. Visitors were interviewed to share their experiences regarding the centres' services offered. Patients from the hospitals were interviewed about their interest in such support. Data were collected during three different periods and adjustments were made to the centres' services between measurements. RESULTS: 111 (PATIO) and 123 visitors (IntermeZZo) were interviewed, and 189 and 149 patients at the respective hospitals. Reasons to visit PATIO/IntermeZZo were to relax (93.1%), seek professional advice (54.6%) and meet peers (36.3%). Visitors indicated that the visits met their needs (99.1%), citing the accessible support and the expertise in oncology. 20% of patients interviewed at the hospitals expressed interest in visiting PATIO/IntermeZZo. The majority of patients (89.6%) considered these centres an integral part of their treatment process. These findings were stable over time. CONCLUSIONS: Patients and their relatives highly value the services of hospital-affiliated centres for information and support. Future research should address how such centres best be integrated in the Dutch healthcare system.

10.
Artigo em Inglês | MEDLINE | ID: mdl-37491145

RESUMO

OBJECTIVES: The care needs of patients with advanced cancer and their relatives change throughout the disease trajectory. This study focused on the care-related problems and needs of patients with advanced cancer and their relatives. This was done from the perspective of centres for information and support. METHODS: This cross-sectional study used data from the eQuiPe study: an observational cohort study in which 40 Dutch hospitals participated. All adult patients with a diagnosis of a metastasised tumour and their relatives were eligible. Measures included information on the patients' and relatives' care problems and needs, assessed by the short version of the Problems and Needs in Palliative Care questionnaire. Socioeconomic demographics were also collected. RESULTS: 1103 patients with advanced cancer and 831 relatives were included. Both patients (M=60.3, SD=29.0) and relatives (M=59.2, SD=26.6) experienced most problems in the domain of 'psychological issues'. Both patients (M=14.0, SD=24.2) and relatives (M=17.7, SD=25.7) most frequently reported unmet needs within this domain. The most often reported unmet need by patients was 'worrying about the future of my loved ones' (22.0%); for relatives this was 'fear for physical suffering of the patient' (32.8%). There was no clear relationship between socioeconomic demographics and the experienced unmet needs. CONCLUSIONS: The most often mentioned unmet needs consisted of fears and worries, followed by a broad range of topics within multiple domains. Centres for information and support may play a role in reducing the unmet needs of (potential) visitors as these centres provide support on a broad range of topics.

12.
Cardiovasc Res ; 111(4): 410-21, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-27357638

RESUMO

AIM: In healthy hearts, ventricular gap junctions are mainly composed by connexin43 (Cx43) and localize in the intercalated disc, enabling appropriate electrical coupling. In diseased hearts, Cx43 is heterogeneously down-regulated, whereas activity of calmodulin/calcium-calmodulin protein kinase II (CaM/CaMKII) signalling increases. It is unclear if CaM/CaMKII affects Cx43 expression/localization or impulse propagation. We analysed different models to assess this. METHODS AND RESULTS: AC3-I mice with CaMKII genetically inhibited were subjected to pressure overload (16 weeks, TAC vs. sham). Optical and epicardial mapping was performed on Langendorff-perfused rabbit and AC3-I hearts, respectively. Cx43 subcellular distribution from rabbit/mouse ventricles was evaluated by immunoblot after Triton X-100-based fractionation. In mice with constitutively reduced CaMKII activity (AC3-I), conduction velocity (CV) was augmented (n = 11, P < 0.01 vs. WT); in AC3-I, CV was preserved after TAC, in contrast to a reduction seen in TAC-WT mice (-20%). Cx43 expression was preserved after TAC in AC3-I mice, though arrhythmias and fibrosis were still present. In rabbits, W7 (CaM inhibitor, 10 µM) increased CV (6-13%, n= 6, P< 0.05), while susceptibility to arrhythmias decreased. Immunoconfocal microscopy revealed enlarged Cx43 cluster sizes at intercalated discs of those hearts. Total Cx43 did not change by W7 (n= 4), whereas Triton X-100 insoluble Cx43 increased (+21%, n= 4, P< 0.01). Similar findings were obtained in AC3-I mouse hearts when compared with control, and in cultured dog cardiomyocytes. Functional implication was shown through increased intercellular coupling in cultured neonatal rat cardiomyocytes. CONCLUSION: Both acute and chronic CaM/CaMKII inhibition improves conduction characteristics and enhances localization of Cx43 in the intercalated disc. In the absence of fibrosis, this reduced the susceptibility for arrhythmias.


Assuntos
Antiarrítmicos/farmacologia , Arritmias Cardíacas/metabolismo , Proteína Quinase Tipo 2 Dependente de Cálcio-Calmodulina/metabolismo , Calmodulina/metabolismo , Comunicação Celular/efeitos dos fármacos , Coração/fisiopatologia , Miocárdio/metabolismo , Animais , Antiarrítmicos/metabolismo , Conexina 43/metabolismo , Cães , Junções Comunicantes/metabolismo , Sistema de Condução Cardíaco/efeitos dos fármacos , Sistema de Condução Cardíaco/metabolismo , Camundongos , Modelos Animais , Coelhos , Ratos
13.
Cardiovasc Res ; 94(3): 450-9, 2012 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-22374989

RESUMO

AIMS: Reentry accounts for most life-threatening arrhythmias, complicating myocardial infarction, and therapies that consistently prevent reentry from occurring are lacking. In this study, we compare antiarrhythmic effects of gene transfer of green fluorescent protein (GFP; sham), the skeletal muscle sodium channel (SkM1), the liver-specific connexin (Cx32), and SkM1/Cx32 in the subacute canine infarct. METHODS AND RESULTS: Immediately after ligation of the left anterior descending artery, viral constructs were implanted in the epicardial border zone (EBZ). Five to 7 days later, efficient restoration of impulse propagation (narrow QRS and local electrogram duration) occurred in SkM1, Cx32, and SkM1/Cx32 groups (P< 0.05 vs. GFP). Programmed electrical stimulation from the EBZ induced sustained ventricular tachycardia (VT)/ventricular fibrillation (VF) in 15/22 GFP dogs vs. 2/12 SkM1, 6/14 Cx32, and 8/10 SkM1/Cx32 (P< 0.05 SkM1 vs. GFP). GFP, SkM1, and SkM1/Cx32 had predominantly polymorphic VT/VF, whereas in Cx32 dogs, monomorphic VT predominated (P< 0.05 for Cx32 vs. GFP). Tetrazolium red staining showed significantly larger infarcts in Cx32- vs. GFP-treated animals (P< 0.05). CONCLUSION: Whereas SkM1 gene transfer reduces the incidence of inducible VT/VF, Cx32 therapy to improve gap junctional conductance results in larger infarct size, a different VT morphology, and no antiarrhythmic efficacy.


Assuntos
Arritmias Cardíacas/tratamento farmacológico , Conexinas/metabolismo , Junções Comunicantes/efeitos dos fármacos , Proteínas Musculares/metabolismo , Infarto do Miocárdio/tratamento farmacológico , Infarto do Miocárdio/fisiopatologia , Canais de Sódio/metabolismo , Fibrilação Ventricular/tratamento farmacológico , Animais , Antiarrítmicos/uso terapêutico , Conexinas/genética , Cães , Estimulação Elétrica , Eletrocardiografia , Masculino , Camundongos , Proteínas Musculares/genética , Ratos , Canais de Sódio/genética , Fibrilação Ventricular/fisiopatologia , Proteína beta-1 de Junções Comunicantes
14.
Circ Arrhythm Electrophysiol ; 5(4): 831-40, 2012 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-22722661

RESUMO

BACKGROUND: In depolarized myocardial infarct epicardial border zones, the cardiac sodium channel is largely inactivated, contributing to slow conduction and reentry. We have demonstrated that adenoviral delivery of the skeletal muscle Na(+) channel (SkM1) to epicardial border zones normalizes conduction and reduces induction of ventricular tachycardia/ventricular fibrillation. We now studied the impact of canine mesenchymal stem cells (cMSCs) in delivering SkM1. METHODS AND RESULTS: cMSCs were isolated and transfected with SkM1. Coculture experiments showed cMSC/SkM1 but not cMSC alone and maintained fast conduction at depolarized potentials. We studied 3 groups in the canine 7d infarct: sham, cMSC, and cMSC/SkM1. In vivo epicardial border zones electrograms were broad and fragmented in sham, narrower in cMSCs, and narrow and unfragmented in cMSC/SkM1 (P<0.05). During programmed electrical stimulation of epicardial border zones, QRS duration in cMSC/SkM1 was shorter than in cMSC and sham (P<0.05). Programmed electrical stimulation-induced ventricular tachycardia/ventricular fibrillation was equivalent in all groups (P>0.05). CONCLUSION: cMSCs provide efficient delivery of SkM1 current. The interventions performed (cMSCs or cMSC/SkM1) were neither antiarrhythmic nor proarrhythmic. Comparing outcomes with cMSC/SkM1 and viral gene delivery highlights the criticality of the delivery platform to SkM1 antiarrhythmic efficacy.


Assuntos
Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais/metabolismo , Proteínas Musculares/metabolismo , Infarto do Miocárdio/cirurgia , Miócitos Cardíacos/metabolismo , Canais de Sódio/metabolismo , Sódio/metabolismo , Taquicardia Ventricular/prevenção & controle , Fibrilação Ventricular/prevenção & controle , Potenciais de Ação , Animais , Animais Recém-Nascidos , Estimulação Cardíaca Artificial , Células Cultivadas , Técnicas de Cocultura , Modelos Animais de Doenças , Cães , Técnicas Eletrofisiológicas Cardíacas , Humanos , Proteínas Musculares/genética , Infarto do Miocárdio/complicações , Infarto do Miocárdio/genética , Infarto do Miocárdio/metabolismo , Infarto do Miocárdio/fisiopatologia , Canal de Sódio Disparado por Voltagem NAV1.5 , Ratos , Ratos Sprague-Dawley , Canais de Sódio/genética , Taquicardia Ventricular/etiologia , Taquicardia Ventricular/genética , Taquicardia Ventricular/metabolismo , Taquicardia Ventricular/fisiopatologia , Fatores de Tempo , Transfecção , Fibrilação Ventricular/etiologia , Fibrilação Ventricular/genética , Fibrilação Ventricular/metabolismo , Fibrilação Ventricular/fisiopatologia
15.
Circ Arrhythm Electrophysiol ; 5(2): 380-90, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22368123

RESUMO

BACKGROUND: Arrhythmogenic ventricular remodeling is hallmarked by both reduced gap junction expression and increased collagen deposition. We hypothesized that reduced connexin43 (Cx43) expression is responsible for enhanced fibrosis in the remodeled heart, resulting in an arrhythmogenic substrate. Therefore, we investigated the effect of normal or reduced Cx43 expression on the formation of fibrosis in a physiological (aging) and pathophysiological (transverse aortic constriction [TAC]) mouse model. METHODS AND RESULTS: The Cx43(fl/fl) and Cx43(CreER(T)/fl) mice were aged 18 to 21 months or, at the age of 3 months, either TAC or sham operated and euthanized after 16 weeks. Epicardial activation mapping of the right and left ventricles was performed on Langendorff perfused hearts. Sustained ventricular arrhythmias were induced in 0 of 11 aged Cx43(fl/fl) and 10 of 15 Cx43(Cre-ER(T)/fl) mice (P<0.01). Cx43 expression was reduced by half in aged Cx43(CreER(T)/fl) compared with aged Cx43(fl/fl) mice, whereas collagen deposition was significantly increased from 1.1±0.2% to 7.4±1.3%. Aged Cx43(CreER(T)/fl) mice with arrhythmias had significantly higher levels of fibrosis and conduction heterogeneity than aged Cx43(CreER(T)/fl) mice without arrhythmias. The TAC operation significantly increased fibrosis in control compared with sham (4.0±1.2% versus 0.4±0.06%), but this increase was significantly higher in Cx43(CreER(T)/fl) mice (10.8±1.4%). Discoidin domain receptor 2 expression was unchanged, but procollagen peptide I and III expression and collagen type 1α2 mRNA levels were higher in TAC-operated Cx43HZ mice. CONCLUSIONS: Reduced cellular coupling results in more excessive collagen deposition during aging or pressure overload in mice due to enhanced fibroblast activity, leading to increased conduction in homogeneity and proarrhythmia.


Assuntos
Envelhecimento/metabolismo , Aorta/fisiopatologia , Conexina 43/deficiência , Constrição Patológica/metabolismo , Fibroblastos/patologia , Miocárdio/metabolismo , Miocárdio/patologia , Animais , Arritmias Cardíacas/metabolismo , Arritmias Cardíacas/fisiopatologia , Proliferação de Células , Colágeno/metabolismo , Feminino , Fibrose , Sistema de Condução Cardíaco/fisiopatologia , Masculino , Camundongos , Modelos Animais , Estresse Fisiológico/fisiologia
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