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1.
JAMA Netw Open ; 7(9): e2433153, 2024 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-39269704

RESUMO

Importance: Multicomponent electronic patient-reported outcome cancer symptom management systems reduce symptom burden. Whether all components contribute to symptom reduction is unknown. Objective: To deconstruct intervention components of the Symptom Care at Home (SCH) system, a digital symptom monitoring and management intervention that has demonstrated efficacy, to determine which component or combination of components results in the lowest symptom burden. Design, Setting, and Participants: This randomized clinical trial included participants who were older than 18 years, had been diagnosed with cancer, had a life expectancy of 3 months or greater, were beginning a chemotherapy course planned for at least 3 cycles, spoke English, and had daily access and ability to use a telephone. Eligible participants were identified from the Huntsman Cancer Institute, University of Utah (Salt Lake City), and from Emory University Winship Cancer Institute, including Grady Memorial Hospital (Atlanta, Georgia), from August 7, 2017, to January 17, 2020. Patients receiving concurrent radiation therapy were excluded. Dates of analysis were from February 1, 2020, to December 22, 2023. Interventions: Participants reported symptoms daily during a course of chemotherapy and received automated self-management coaching with an activity tracker without (group 1) and with (group 2) visualization, nurse practitioner (NP) follow-up for moderate-to-severe symptoms without (group 3) and with (group 4) decision support, or the complete SCH intervention (group 5). Main Outcomes and Measures: The primary outcome, symptom burden, was assessed as the summed severity of 11 chemotherapy-related symptoms rated on a scale of 1 to 10 (with higher scores indicating greater severity), if present. Results: The 757 participants (mean [SD] age, 59.2 [12.9] years) from 2 cancer centers were primarily female (61.2%). The most common cancer diagnoses were breast (132 [17.4%]), lung (107 [14.1%]), and colorectal (99 [13.1%]) cancers; 369 patients (48.7%) had metastatic disease. The complete SCH intervention including automated self-management coaching and NP follow-up with decision support (group 5) was superior in reducing symptom burden to either of the self-management coaching groups, as shown by the mean group differences in area under the curve (group 1, 1.86 [95% CI, 1.30-2.41] and group 2, 2.38 [95% CI, 1.84-2.92]; both P < .001), and to either of the NP follow-up groups (group 3, 0.57 [95% CI, 0.03-1.11]; P =.04; and group 4, 0.66 [95% CI, 0.14-1.19]; P = .014). Additionally, NP follow-up was superior to self-management coaching (group 1 vs group 3, 1.29 [95% CI, 0.72-1.86]; group 1 vs group 4, 1.20 [95% 12 CI, 0.64-1.76]; group 2 vs group 3, 1.81 [95% CI, 1.25-2.37]; and group 2 vs group 4, 1.72 [95% CI, 1.17-2.26]; all P < .001), but there was no difference between the 2 self-management coaching groups (-0.52 [95% CI, -1.09 to 0.05]; P = .07) or between the 2 NP groups (-0.10 [95% CI, -0.65 to 0.46]; P = .74). Conclusions and Relevance: In this randomized clinical trial of adult participants undergoing chemotherapy treatment for cancer, the complete intervention, rather than any individual component of the SCH system, achieved the greatest symptom burden reduction. These findings suggest that a multicomponent digital approach to cancer symptom management may offer optimal symptom burden reduction. Trial Registration: ClinicalTrials.gov Identifier: NCT02779725.


Assuntos
Neoplasias , Medidas de Resultados Relatados pelo Paciente , Humanos , Feminino , Masculino , Pessoa de Meia-Idade , Neoplasias/terapia , Neoplasias/tratamento farmacológico , Idoso , Adulto , Autogestão/métodos , Autocuidado/métodos
2.
Clin J Oncol Nurs ; 28(5): 483-491, 2024 Sep 17.
Artigo em Inglês | MEDLINE | ID: mdl-39324718

RESUMO

BACKGROUND: About one-quarter of patients with advanced prostate cancer have alterations in homologous recombination repair (HRR) genes. In a global phase 3 study, talazoparib plus enzalutamide significantly improved progression-free survival in patients with HRR-deficient metastatic castration-resistant prostate cancer (mCRPC). OBJECTIVES: This article reviews the role of oncology nurses and advanced practice providers (APPs) in administering talazoparib plus enzalutamide in patients with mCRPC. METHODS: This review and hypothetical case study illustrate the role of oncology nurses and APPs in the administration of talazoparib plus enzalutamide and the management of adverse events to ensure safe and effective use in clinical practice. FINDINGS: Oncology nurses and APPs play an important role in the dosing and administration of talazoparib plus enzalutamide and can recognize and manage adverse events in patients with HRR-deficient mCRPC.


Assuntos
Benzamidas , Nitrilas , Enfermagem Oncológica , Feniltioidantoína , Ftalazinas , Neoplasias de Próstata Resistentes à Castração , Humanos , Nitrilas/uso terapêutico , Feniltioidantoína/uso terapêutico , Masculino , Benzamidas/uso terapêutico , Neoplasias de Próstata Resistentes à Castração/tratamento farmacológico , Neoplasias de Próstata Resistentes à Castração/patologia , Ftalazinas/uso terapêutico , Ftalazinas/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Idoso , Pessoa de Meia-Idade
3.
JCO Clin Cancer Inform ; 8: e2300243, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-39042843

RESUMO

PURPOSE: People with cancer experience poorly controlled symptoms that persist between treatment visits. Automated digital technology can remotely monitor and facilitate symptom management at home. Essential to digital interventions is patient engagement, user satisfaction, and intervention benefits that are distributed across patient populations so as not to perpetuate inequities. We evaluated Symptom Care at Home (SCH), an automated digital platform, to determine patient engagement, satisfaction, and whether intervention subgroups gained similar symptom reduction benefits. METHODS: 358 patients with cancer receiving a course of chemotherapy were randomly assigned to SCH or usual care (UC). Both groups reported daily on 11 symptoms and completed the SF36 (Short Form Health Survey) monthly. SCH participants received immediate automated self-care coaching on reported symptoms. As needed, nurse practitioners followed up for poorly controlled symptoms. RESULTS: The average participant was White (83%), female (75%), and urban-dwelling (78.6%). Daily call adherence was 90% of expected days. Participants reported high user satisfaction. SCH participants had lower symptom burden than UC in all subgroups: age, sex, race, income, residence type, diagnosis, and stage (all P < .001 effect size 0.33-0.65), except for stages I and II cancers. Non-White and lower-income SCH participants gained a higher magnitude of symptom reduction than White participants and higher-income participants. Additionally, SCH men gained higher SF36 mental health (MH) benefit. There were no differences on other SF36 indices. CONCLUSION: Participants were highly satisfied and consistently engaged the SCH platform. SCH men gained large MH improvements, perhaps from increased comfort in sharing concerns through automated interactions. Although all intervention subgroups benefited, non-White participants and those with lower income gained higher symptom reduction benefit, suggesting that systematic care through digital tools can overcome existing disparities in symptom care outcomes.


Assuntos
Neoplasias , Telemedicina , Humanos , Masculino , Feminino , Neoplasias/terapia , Neoplasias/diagnóstico , Neoplasias/psicologia , Pessoa de Meia-Idade , Idoso , Equidade em Saúde , Adulto , Satisfação do Paciente , Autocuidado/métodos , Gerenciamento Clínico
4.
Eur Urol Oncol ; 2024 Jun 11.
Artigo em Inglês | MEDLINE | ID: mdl-38866640

RESUMO

BACKGROUND AND OBJECTIVE: Recent clinical trials have shown improvement in progression-free survival in men with metastatic prostate cancer (mPC) treated with combination poly-ADP ribose polymerase (PARP) inhibitors (PARPi) and novel hormonal therapy (NHT). Regulatory bodies in the USA, Canada, Europe, and Japan have recently approved this combination therapy for mPC. Common adverse events (AEs) include fatigue, nausea and vomiting, and anemia. Nuanced AE management guidance for these combinations is lacking. The panel objective was to develop expert consensus on AE management in patients with mPC treated with the combination PARPi + NHT. METHODS: The RAND/University of California Los Angeles modified Delphi Panel method was used. AEs were defined using the Common Terminology Criteria for Adverse Events. Twelve experts (seven medical oncologists, one advanced practice registered nurse, three urologists, and one patient advocate) reviewed the relevant literature; independently rated initial AE management options for the agent suspected of causing the AE for 419 patient scenarios on a 1-9 scale; discussed areas of agreement (AoAs) and disagreement (AoDs) at a March 2023 meeting; and repeated these ratings following the meeting. Second-round ratings formed the basis of guidelines. KEY FINDINGS AND LIMITATIONS: AoDs decreased from 41% to 21% between the first and second round ratings, with agreement on at least one management strategy for every AE. AoAs included the following: (1) continue therapy with symptomatic treatment for patients with mild AEs; (2) for moderate fatigue, recommend nonpharmacologic treatment, hold treatment temporarily, and restart at a reduced dose when symptoms resolve; (3) for severe nausea or any degree of vomiting where symptomatic treatment fails, hold treatment temporarily and restart at a reduced dose when symptoms resolve; and (4) for hemoglobin 7.1-8.0 g/dl and symptoms of anemia, hold treatment temporarily and restart at a reduced dose after red blood cell transfusion. CONCLUSIONS AND CLINICAL IMPLICATIONS: This expert guidance can support management of AEs in patients with mPC receiving combination PARPi + NHT therapy. PATIENT SUMMARY: A panel of experts developed guidelines for adverse event (AE) management in patients with metastatic prostate cancer treated with a combination of poly-ADP ribose polymerase inhibitors and novel hormonal therapy. For mild AEs, continuation of cancer therapy along with symptomatic treatment is recommended. For moderate or severe AEs, cancer therapy should be stopped temporarily and restarted at the same or a reduced dose when AE resolves.

5.
Cancer ; 130(7): 1171-1182, 2024 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-38009953

RESUMO

BACKGROUND: Care for those with life-limiting cancer heavily involves family caregivers who may experience significant physical and emotional burden. The purpose of this study was to test the impact of Symptom Care at Home (SCH), an automated digital family caregiver coaching intervention, during home hospice, when compared to usual hospice care (UC) on the primary outcome of overall caregiver burden. Secondary outcomes included Caregiver Burden at weeks 1 and 8, Mood and Vitality subscales, overall moderate-to-severe caregiving symptoms, and sixth month spouse/partner bereavement outcomes. METHODS: Using a randomized, multisite, nonblinded controlled trial, 332 cancer family caregivers were enrolled and analyzed (159 SCH vs. 173 UC). Caregivers were primarily White (92%), female (69%), and spouse caregivers (53%). Caregivers provided daily reports on severity levels (0-10 scale) for their anxiety, depressed mood, fatigue, disturbed sleep, and caregiving interference with normal activities. These scores combined constituted the Caregiver Burden primary outcome. Based on reported symptoms, SCH caregivers received automated, tailored coaching about improving their well-being. Reports of moderate-to-severe caregiving symptoms also triggered hospice nurse notification. Secondary outcomes of Mood and Vitality were subcomponents of the Caregiver Burden score. A combined bereavement adjustment tool captured sixth month bereavement. RESULTS: The SCH intervention reduced overall Caregiver Burden compared to UC (p < .001), with a 38% reduction at 8 weeks and a medium-to-large effect size (d = .61). SCH caregivers experienced less (p < .001) disruption in both Mood and Vitality. There were higher levels of moderate-to-severe caregiving symptoms overtime in UC (OR, 2.722). All SCH caregivers benefited regardless of caregiver: sex, caregiver relationship, age, patient diagnosis and family income. SCH spouse/partner caregivers achieved better sixth month bereavement adjustment than UC (p < .007). CONCLUSIONS: The SCH intervention significantly decreased caregiving burden over UC and supports the maintenance of family caregiver mood and vitality throughout caregiving with extended benefit into bereavement.


Assuntos
Luto , Cuidados Paliativos na Terminalidade da Vida , Hospitais para Doentes Terminais , Tutoria , Neoplasias , Feminino , Humanos , Cuidadores/psicologia , Família/psicologia , Cuidados Paliativos na Terminalidade da Vida/psicologia , Neoplasias/terapia
6.
J Pain Symptom Manage ; 66(1): 33-43, 2023 07.
Artigo em Inglês | MEDLINE | ID: mdl-36889453

RESUMO

CONTEXT: Caregivers managing symptoms of family members with cancer during home hospice care, often feel ill-prepared and need patient care coaching. OBJECTIVES: This study tested the efficacy of an automated mHealth platform that included caregiver coaching on patient symptom care and nurse notifications of poorly controlled symptoms. The primary outcome was caregiver perception of patients' overall symptom severity throughout hospice care and at weeks one, two, four, and eight. Secondary outcomes compared individual symptom severity. METHODS: Caregivers (n = 298) were randomly assigned to the Symptom Care at Home (SCH) intervention (n = 144) or usual hospice care (UC) (n = 154). All caregivers placed daily calls to the automated system that assessed the presence and severity of 11 end-of-life patient physical and psychosocial symptoms. SCH caregivers received automated coaching on symptom care based on reported patient symptoms and their severity. Moderate-to-severe symptoms were also relayed to the hospice nurse. RESULTS: The SCH intervention produced a mean overall symptom reduction benefit, over UC, of 4.89 severity points (95% CI 2.86-6.92) (P < 0.001), with a moderate effect size (d = 0.55). The SCH benefit also occurred at each timepoint (P < 0.001- 0.020). There was a 38% reduction in days reporting moderate-to-severe patient symptoms compared to UC (P < 0.001) with 10/11 symptoms significantly reduced in SCH compared to UC. CONCLUSION: Automated mHealth symptom reporting by caregivers, paired with tailored caregiver coaching on symptom management and nurse notifications, reduces cancer patients' physical and psychosocial symptoms during home hospice, providing a novel and efficient approach to improving end-of-life care.


Assuntos
Cuidados Paliativos na Terminalidade da Vida , Neoplasias , Telemedicina , Humanos , Cuidadores/psicologia , Neoplasias/terapia , Cuidados Paliativos na Terminalidade da Vida/psicologia , Cuidados Paliativos , Qualidade de Vida
7.
Curr Hematol Malig Rep ; 17(1): 25-30, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-35015256

RESUMO

PURPOSE OF REVIEW: For nearly 20 years, oncology specialty practices have been working to integrate telemedicine technologies into standard patient care models. However, hematology practices have been slower to adopt telemedicine due to traditional care models that rely on interdisciplinary regional care centers and their ability to provide comprehensive and centralized services. Patients have traditionally been able to access high-quality medical care, diagnostics, supportive care, and clinical trials from these regional care centers, but they are required to attend frequent in-person visits to access these services. Rural and underserved patients experience more barriers than their urban counterparts to access the same level of care. RECENT FINDINGS: The COVID-19 pandemic has elevated telemedicine into the forefront of care, highlighting both promise and limitations to incorporating telemedicine into specialty hematology care. Hematologists should consider the benefits of incorporating telemedicine technologies into standard-of-care practices to promote patient-centered care and provide equal access to all patient populations.


Assuntos
COVID-19 , Neoplasias Hematológicas , Telemedicina , Neoplasias Hematológicas/diagnóstico , Neoplasias Hematológicas/terapia , Humanos , Pandemias , SARS-CoV-2
8.
Aging Ment Health ; 24(2): 341-348, 2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-30588845

RESUMO

Objectives: The objective of this qualitative study was to better understand facilitators and barriers to depression screening for older adults.Methods: We conducted 43 focus groups with 102 providers and 247 beneficiaries or proxies: 13 focus groups with Medicare providers, 28 with older Medicare beneficiaries, and 2 with caregivers of older Medicare beneficiaries. Each focus group was recorded, transcribed, and analyzed using principles of grounded theory.Results: There was widespread consensus among beneficiary and provider focus group participants that depression screening was important. However, several barriers interfered with effective depression screening, including stigma, lack of resources for treatment referrals, and lack of time during medical encounters. Positive communication with providers and an established relationship with a trusted provider were primary facilitators for depression screening. Providers who took the time to put their beneficiaries at ease and used conversational language rather than clinical terms appeared to have the most success in eliciting beneficiary honesty about depressive symptoms. Respondents stressed the need for providers to be attentive, concerned, non-judgmental, and respectful.Conclusion: Findings indicate that using person-centered approaches to build positive communication and trust between beneficiaries and providers could be an effective strategy for improving depression screening. Better screening can lead to higher rates of diagnosis and treatment of depression that could enhance quality of life for older adults.


Assuntos
Depressão/diagnóstico , Programas de Rastreamento/métodos , Qualidade de Vida/psicologia , Estigma Social , Idoso , Idoso de 80 Anos ou mais , Cuidadores , Feminino , Grupos Focais , Teoria Fundamentada , Humanos , Masculino , Medicare , Saúde Mental , Pessoa de Meia-Idade , Relações Médico-Paciente , Pesquisa Qualitativa , Estados Unidos
9.
Prev Med ; 129: 105850, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31629799

RESUMO

Medicare's Annual Wellness Visit (AWV) provides an opportunity to link beneficiaries to cancer screenings and immunizations, however, research has not examined its effectiveness. The aim of this study was to examine the effect of receiving an AWV on outcomes while accounting for the healthy user effect. This study used 2013-2017 Medicare claims data to compare hospital utilization and total expenditures among a 5% random sample of Medicare fee-for-service (FFS) beneficiaries with and without AWV use in 2014 (228,053 AWV users were propensity-score matched to 228,053 nonusers). Linear fixed effects regression models examined differences in study outcomes 12 and 24 months after AWV use, controlling for baseline differences in sociodemographics, health status, utilization, and accountable care organization attribution. The proportion of Medicare FFS beneficiaries that used the AWV increased from 13% in 2013 to 24% in 2017. Users of the AWV had a marginally significant reduction in Medicare spending 12 months (-$122, 95% CI -$256, $11, p = 0.073) and significant reductions (-$162, 95% CI, -$310, -$14, p = 0.032) 24 months after the visit, relative to non-users. However it remains unclear what is driving these savings as there was no change in hospital-related utilization and results may still be biased due to inherent differences between users and non-users. The AWV provides an opportunity for providers to focus on prevention and geriatric needs not covered in typical office visits. Practices adopting AWVs have noted increased revenue, more stable patient populations, and stronger provider-patient relationships. While utilization remains low, it is steadily increasing over time.


Assuntos
Planos de Pagamento por Serviço Prestado/economia , Gastos em Saúde , Hospitalização/estatística & dados numéricos , Medicare/economia , Medicare/estatística & dados numéricos , Serviços Preventivos de Saúde/economia , Organizações de Assistência Responsáveis , Idoso , Detecção Precoce de Câncer , Feminino , Hospitalização/economia , Humanos , Imunização , Masculino , Estados Unidos
10.
Geriatr Nurs ; 40(1): 72-77, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30122404

RESUMO

Preventive service use remains low among Medicare beneficiaries despite the Affordable Care Act's waiver of coinsurance. This study sought to understand barriers and facilitators to preventive service provision, access, and uptake. We used a mixed methods approach synthesizing quantitative survey and qualitative focus group data. Self-reported utilization of and factors related to preventive services were explored using quantitative data from the 2012 Medicare Current Beneficiary Survey. Qualitative data from 16 focus groups conducted in 2016 with a range of providers, health advocates, and Medicare beneficiaries explored perspectives on preventive service use. Providers indicated time and competing priorities as factors for not offering patients a full range of preventive services, while beneficiaries reported barriers related to knowledge, perception, and trust. Current healthcare reform efforts incorporating team-based care, nurses and other non-physician providers, and coordinated electronic health records could support enhanced use of preventive services if fully implemented and utilized.


Assuntos
Conhecimentos, Atitudes e Prática em Saúde , Pessoal de Saúde , Serviços Preventivos de Saúde , Idoso , Detecção Precoce de Câncer/psicologia , Feminino , Grupos Focais , Acessibilidade aos Serviços de Saúde , Humanos , Masculino , Medicare/estatística & dados numéricos , Pessoa de Meia-Idade , Patient Protection and Affordable Care Act , Inquéritos e Questionários , Fatores de Tempo , Estados Unidos
11.
MMWR Morb Mortal Wkly Rep ; 66(1): 19-22, 2017 Jan 13.
Artigo em Inglês | MEDLINE | ID: mdl-28081064

RESUMO

Reporting causes of death accurately is essential to public health and hospital-based programs; however, some U.S. studies have identified substantial inaccuracies in cause of death reporting. Using CDC's national inpatient hospital death rates as a benchmark, the Missouri Department of Health and Senior Services (DHSS) analyzed inpatient death rates reported by hospitals with high inpatient death rates in St. Louis and Kansas City metro areas. Among the selected hospitals with high inpatient death rates, 45.8% of death certificates indicated an underlying cause of death that was inconsistent with CDC's Guidelines for Death Certificate completion. Selected hospitals with high inpatient death rates were more likely to overreport heart disease and renal disease, and underreport cancer as an underlying cause of death. Based on these findings, the Missouri DHSS initiated a new web-based training module for death certificate completion based on the CDC guidelines in an effort to improve accuracy in cause of death reporting.


Assuntos
Benchmarking/métodos , Atestado de Óbito , Mortalidade Hospitalar , Causas de Morte , Centers for Disease Control and Prevention, U.S. , Hospitais , Humanos , Missouri/epidemiologia , Estados Unidos/epidemiologia
12.
Trials ; 14: 95, 2013 Apr 04.
Artigo em Inglês | MEDLINE | ID: mdl-23556434

RESUMO

BACKGROUND: Over the last three decades there has been a substantial increase in the proportion of children who are overweight or obese. The Healthy Lifestyles Programme (HeLP) is a novel school-based intervention, using highly interactive and creative delivery methods to prevent obesity in children. METHODS/DESIGN: We describe a cluster randomised controlled trial to evaluate the effectiveness and cost effectiveness of HeLP. The intervention has been developed using intervention mapping (involving extensive stakeholder involvement) and has been guided by the Information, Motivation, Behavioural Skills model. HeLP includes creating a receptive environment, drama activities, goal setting and reinforcement activities and runs over three school terms. Piloting showed that 9 to 10 year olds were the most receptive and participative. This study aims to recruit 1,300 children from 32 schools (over half of which will have ≥19% of pupils eligible for free school meals) from the southwest of England. Participating schools will be randomised to intervention or control groups with baseline measures taken prior to randomisation. The primary outcome is change in body mass index standard deviation score (BMI SDS) at 24 months post baseline. Secondary outcomes include, waist circumference and percent body fat SDS and proportion of children classified as overweight or obese at 18 and 24 months and objectively measured physical activity and food intake at 18 months. Between-group comparisons will be made using random effects regression analysis taking into account the hierarchical nature of the study design. An economic evaluation will estimate the incremental cost-effectiveness of HeLP, compared to control, from the perspective of the National Health Service (NHS)/third party payer. An in-depth process evaluation will provide insight into how HeLP works, and whether there is any differential uptake or engagement with the programme. DISCUSSION: The results of the trial will provide evidence on the effectiveness and cost effectiveness of the Healthy Lifestyles Programme in affecting the weight status of children. TRIAL REGISTRATION: ISRCTN15811706.


Assuntos
Comportamento Infantil , Comportamentos Relacionados com a Saúde , Promoção da Saúde , Obesidade/prevenção & controle , Projetos de Pesquisa , Comportamento de Redução do Risco , Serviços de Saúde Escolar , Adiposidade , Índice de Massa Corporal , Criança , Protocolos Clínicos , Análise Custo-Benefício , Dieta/efeitos adversos , Inglaterra , Exercício Físico , Comportamento Alimentar , Objetivos , Custos de Cuidados de Saúde , Promoção da Saúde/economia , Humanos , Atividade Motora , Obesidade/diagnóstico , Obesidade/economia , Obesidade/fisiopatologia , Obesidade/psicologia , Reforço Psicológico , Serviços de Saúde Escolar/economia , Medicina Estatal/economia , Fatores de Tempo , Resultado do Tratamento , Circunferência da Cintura
13.
J Cell Biol ; 198(6): 1039-54, 2012 Sep 17.
Artigo em Inglês | MEDLINE | ID: mdl-22965910

RESUMO

The cytoplasmic dynein motor generates pulling forces to center and orient the mitotic spindle within the cell. During this positioning process, dynein oscillates from one pole of the cell cortex to the other but only accumulates at the pole farthest from the spindle. Here, we show that dynein light chain 1 (DYNLL1) is required for this asymmetric cortical localization of dynein and has a specific function defining spindle orientation. DYNLL1 interacted with a spindle-microtubule-associated adaptor formed by CHICA and HMMR via TQT motifs in CHICA. In cells depleted of CHICA or HMMR, the mitotic spindle failed to orient correctly in relation to the growth surface. Furthermore, CHICA TQT motif mutants localized to the mitotic spindle but failed to recruit DYNLL1 to spindle microtubules and did not correct the spindle orientation or dynein localization defects. These findings support a model where DYNLL1 and CHICA-HMMR form part of the regulatory system feeding back spindle position to dynein at the cell cortex.


Assuntos
Dineínas do Citoplasma/genética , Dineínas do Citoplasma/metabolismo , Proteínas Associadas aos Microtúbulos/genética , Proteínas Associadas aos Microtúbulos/metabolismo , Fuso Acromático/genética , Fuso Acromático/metabolismo , Motivos de Aminoácidos/genética , Proteínas de Ciclo Celular , Linhagem Celular Tumoral , Proteínas Cromossômicas não Histona/genética , Proteínas Cromossômicas não Histona/metabolismo , Citoplasma/genética , Citoplasma/metabolismo , Proteínas da Matriz Extracelular/genética , Proteínas da Matriz Extracelular/metabolismo , Células HEK293 , Células HeLa , Humanos , Receptores de Hialuronatos/genética , Receptores de Hialuronatos/metabolismo , Mitose/genética , Mitose/fisiologia , Orientação/fisiologia
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