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1.
Res Pract Thromb Haemost ; 8(4): 102463, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-39026660

RESUMO

Background: Thrombin activatable fibrinolysis inhibitor (TAFI) is one of the most important physiological fibrinolysis inhibitors. Its inhibitory efficacy under physiological conditions remains uncertain. Objectives: Elucidate the role of soluble thrombomodulin (sTM)/TAFI axis in the regulation of fibrinlysis. Methods: Since thrombin is required to generate activated TAFI (TAFIa) that targets the C-terminal lysine of partially digested fibrin, a clot lysis assay is suitable for evaluating its function. Using tissue-type plasminogen activator-induced plasma clot lysis time (tPA-PCLT) together with TAFIa inhibitor and recombinant sTM (rsTM), we evaluated the specific function of TM/TAFI in the plasma milieu. Results: tPA-PCLT values were significantly shortened by the TAFIa inhibitor. rsTM supplementation prolonged tPA-PCLT, which was shortened by the TAFIa inhibitor to a time similar to that obtained without rsTM and with the TAFIa inhibitor. Plasma obtained from patients treated with rsTM showed prolonged tPA-PCLT, which was shortened by the TAFIa inhibitor but not further prolonged by rsTM. However, no significant correlation was observed between tPA-PCLT and parameters of TM/TAFI system in the plasma. Conclusion: The role of the TM/TAFI system in regulating fibrinolysis was successfully evaluated using TAFIa inhibitor and rsTM. Trace amounts of soluble TM in normal plasma appeared sufficient to activate TAFI and inhibit fibrinolysis. Further, a therapeutic dose of rsTM appeared sufficient to activate TAFI and regulate fibrinolysis in the plasma milieu.

2.
Head Neck ; 45(10): 2533-2543, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37552157

RESUMO

BACKGROUND: We aimed to define the indications for sentinel lymph node biopsy (SLNB), the third option for cervical treatment in oral cancer with negative cervical lymph nodes. METHODS: The greatest depth of invasion (DOI) and long diameter (LD) of the primary site were used as exposures. SLN metastasis was considered the outcome. RESULTS: In three trials conducted between 2009 and 2016, 158 patients were eligible and reassigned to this study group. The scatterplot based on the respective values of DOI and LD would eventually be divided into three sections. In cases of sections T1, T2, and T3, the proportions of SLN metastasis positivity were 21.3%, 35.3%, and 51.2%, respectively. In certain cases of T1 with 2 mm < DOI ≤ 5 mm and 8 mm < LD ≤ 20 mm, the proportion of SLN metastasis positivity was 40.9%. CONCLUSIONS: SLNB-navigated or assisted neck dissection can be added as an effective procedure for N0 neck control.


Assuntos
Neoplasias Bucais , Biópsia de Linfonodo Sentinela , Humanos , Metástase Linfática/patologia , Linfonodos/cirurgia , Linfonodos/patologia , Neoplasias Bucais/cirurgia , Neoplasias Bucais/patologia , Esvaziamento Cervical
3.
Int J Aging Hum Dev ; 96(2): 201-218, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-35137634

RESUMO

Social connection is important across the life course, but overall levels have been declining. The COVID-19 pandemic presented a unique context to examine social connectedness and adaptive capacity in times of social adversity. We used a parallel mixed method design to collect online survey data from a representative U.S. sample (N = 359). Applying an exploratory sequential approach, we used a general linear model multivariate approach to repeated measures to test for differences in participants' perceptions of social connectedness by time and age category and qualitative analysis to gain insights about disrupted social contexts. Results indicated that social connectedness decreased after mitigation restrictions for all age groups, but individuals in emerging and late adulthood felt the greatest impact. Two themes emerged: differing emotional responses to altered communication and intentionality of maintaining and/or creating social connections. Experiences of social connectedness need to be understood as a function of life stage and developmental timing.


Assuntos
COVID-19 , Pandemias , Humanos , Adulto
4.
Body Image ; 41: 396-405, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35533520

RESUMO

Body image is multidimensional and less is known about how the combination of positive and negative body image relates to eating behaviors. We used a person-centered approach to identify profiles of body image and explore the relationship between profile membership, sex, age, race, and current marital status, and eating behaviors in a community sample of adults. We recruited 288 adults 18 and older living in the United States using Prolific Academic. Participants completed an online survey assessing body appreciation, functionality appreciation, body dissatisfaction, weight bias internalization, and adaptive and maladaptive eating behaviors. We used latent profile analysis to identify four distinct body image profiles: appreciation & mild dissatisfaction, functional appreciation & moderate dissatisfaction, strong dissatisfaction, and strong appreciation. Profile membership differed by sex with more women and younger adults in profiles higher in negative body image. The relationships between profiles and eating behaviors differed; the three profiles including negative body image had the lowest adaptive and highest maladaptive eating behaviors. The identification of clinically relevant profiles: (1) confirm positive and negative body image coexist, (2) identify high- and low-risk profiles of body image and eating behavior, and (3) offer preliminary suggestions for screening and tailoring preventive interventions.


Assuntos
Insatisfação Corporal , Transtornos da Alimentação e da Ingestão de Alimentos , Adulto , Imagem Corporal/psicologia , Comportamento Alimentar , Feminino , Humanos , Inquéritos e Questionários
5.
Nutr Health ; : 2601060221090696, 2022 Apr 04.
Artigo em Inglês | MEDLINE | ID: mdl-35369805

RESUMO

Background: Weight-neutral interventions that promote adaptive eating behaviors are becoming a growing area of practice. Understanding whether adaptive eating behaviors are associated with improved diet quality is essential. Body image may be an important factor in this relationship given its close connection to eating behaviors. Aim: The purpose of this study was to develop an understanding of the relationships between positive and negative body image, adaptive and maladaptive eating behaviors, and diet quality. Methods: We recruited 288 adults 18 years and older who were living in the US using Prolific Academic. Participants completed an online survey including measures of positive and negative body image, adaptive and maladaptive eating behaviors, and a dietary screener questionnaire (DSQ). We ran a hierarchical linear regression and tested whether body image and diet quality were mediated by eating behavior. Results: Body image and maladaptive eating behaviors were not associated with diet quality. Body-food choice congruence (B-FCC), an adaptive eating behavior, was associated with diet quality. B-FCC mediated the relationship of positive and negative body image to diet quality. Conclusions: Our findings provide additional support for weight-neutral or adaptive eating interventions as a mechanism to promote diet quality. Additional research may benefit from exploring indirect effects of body image on diet intake, the relationship between eating behavior and diet quality using qualitative data, and the comparison of weight-neutral or non-diet interventions with traditional behavior change interventions.

6.
Am J Health Promot ; 36(6): 1005-1013, 2022 07.
Artigo em Inglês | MEDLINE | ID: mdl-35382605

RESUMO

PURPOSE: Developmentally appropriate messaging interventions may be an effective way to promote healthy behaviors in young children. However, there is a gap in the literature describing communication about food and nutrition within the parent-child dyad. Thus, we explored the content, frequency, context, and purpose of parental conversations about food and nutrition. DESIGN: Using a semi-structured interview guide, 20 in-person interviews were conducted with parents of 3 to 9 year old children living in Washington and Oregon at the location of their choice. METHODS: Qualitative data was analyzed using open coding and grounded theory. RESULTS: Three categories described communication within the dyad: purpose, content, and the bidirectional interaction between the parent and the child. Purpose included three themes: consumption, variety, and balance. Content included three themes: food-related content, body-related content, and utilizing connections. Subthemes within food-related content included properties, production, and preparation. Body-related content subthemes were utilization of food in the body and interoceptive awareness. Parents highlighted connections between the food and body-related content. Lastly, parent-child conversations about food and nutrition were dynamic and bidirectional with parents adapting to child factors. CONCLUSION: Our findings provide a description of parent communication about food and nutrition and suggest investigation of the purpose and content of communication and how parents tailor messages to their child.


Assuntos
Comunicação , Pais , Criança , Pré-Escolar , Comportamentos Relacionados com a Saúde , Humanos , Estado Nutricional , Relações Pais-Filho
7.
Eat Behav ; 45: 101606, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35231798

RESUMO

Intuitive eating has been associated with positive health benefits, yet the research investigating intuitive eating with dietary intake is minimal, inconsistent, and may differ by sex and food security status. The purpose of this study is to identify relationships between intuitive eating and dietary intake in adults living in the US and explore differences by sex and food insecurity status. We recruited 308 adults 18 years and older living in the US to complete an online survey including demographic data, intuitive eating, a diet screener questionnaire, and food insecurity status. We used structural equation modeling to analyze relationships between intuitive eating subscales, calcium, whole grains, added sugars, vegetables, and fruits. Then, we explored differences by sex and food security status. Unconditional permission to eat was associated with a higher intake of added sugar, while body-food choice congruence was associated with a lower intake of added sugar and calcium, and a higher intake of vegetables and whole grains. Eating for physical rather than emotional reasons was associated with a higher intake of calcium and vegetables. Intuitive eating differed by sex and food security status. While intuitive eating is not consistently related to the intake of more nutritious foods, eating for physical rather than emotional reasons and body-food choice congruence may promote diet quality in a community sample. Men and food secure adults scored higher in intuitive eating suggesting tailored intuitive eating interventions may be essential to increase effectiveness.


Assuntos
Cálcio , Comportamento Alimentar , Adulto , Dieta , Ingestão de Alimentos/psicologia , Comportamento Alimentar/psicologia , Humanos , Masculino , Açúcares , Verduras
8.
J Fam Econ Issues ; 43(2): 227-238, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35221641

RESUMO

The COVID-19 pandemic has disrupted rural communities and is exacerbating the economic, health, and social inequality for poor Americans in rural areas. Mounting job losses and illness in these communities are also pushing low-income families further into poverty. Based on previous research on rural poverty, this paper highlights the difficulties that marginalized rural families could experience due to the current pandemic. We focus on five major areas that affect the lives of the rural poor: economic security, family well-being, food insecurity, health security, and the challenges of rural living with a special focus on racial and ethnic minority families. We provide tangible recommendations on what can be done in the short term to enable rural families to cope with the consequences of the pandemic. We also discuss long-term policy recommendations that would be necessary for rural communities to thrive after the pandemic and survive future outbreaks.

9.
Case Rep Dent ; 2021: 1358481, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34434584

RESUMO

Myxomas arising in the oral and maxillofacial areas are extremely rare. This study reports a case of myxoma arising in the soft tissue beneath the buccal mucosa of an 86-year-old man.

10.
Am J Health Behav ; 45(1): 44-61, 2021 01 01.
Artigo em Inglês | MEDLINE | ID: mdl-33402237

RESUMO

Objectives: We examined perceived behavior change since implementation of physical distancing restrictions and identified modifiable (self-rated health, resilience, depressive symptoms, social support and subjective wellbeing) and non-modifiable (demographics) risk/protective factors. Methods: A representative US sample (N = 362) completed an online survey about potential risk/protective factors and health behaviors prior to the pandemic and after implemented/recommended restrictions. We assessed change in perceived health behaviors prior to and following introduction of COVID-19. We conducted hierarchical linear regression to explore and identify risk/protective factors related to physical activity, diet quality, and social isolation. Results: There have been substantial decreases in physical activity and increases in sedentary behavior and social isolation, but no changes in diet quality since COVID-19. We identified modifiable and non-modifiable factors associated with each health behavior. Conclusions: Negative effects indicate the need for universal intervention to promote health behaviors. Inequalities in health behaviors among vulnerable populations may be exacerbated since COVID-19, suggesting need for targeted invention. Social support may be a mechanism to promote health behaviors. We suggest scaling out effective health behavior interventions with the same intensity in which physical distancing recommendations were implemented.


Assuntos
COVID-19/epidemiologia , Comportamentos Relacionados com a Saúde , Adulto , COVID-19/psicologia , Depressão/epidemiologia , Dieta/estatística & dados numéricos , Exercício Físico , Nível de Saúde , Humanos , Masculino , Distanciamento Físico , Comportamento Sedentário , Apoio Social , Estados Unidos/epidemiologia
11.
J Fam Econ Issues ; 42(Suppl 1): 107-117, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33132672

RESUMO

Scholarship on families in poverty, in the last decade, documented various struggles and challenges faced by low-income families and expanded our understanding of their complicated life circumstances embedded within the contexts of community, culture, and policies. The research articles published in the Journal of Family and Economic Issues during this time, that highlighted poverty, focused primarily on three topic areas: economic security, family life issues, and food security. Overall, findings conclude that family well-being and stability cannot be promoted without the consideration of environmental factors. They depend on the interaction among individual (e.g., increased human capital), family (e.g., positive co-parental relationship), community (e.g., affordable childcare), and policy changes (e.g., realistic welfare-to-work programs). Collectively, the articles have provided a road map for future research directions.

13.
Clin Exp Dent Res ; 5(2): 116-120, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-31049213

RESUMO

This study included 30 patients (17 males and 13 females; mean age, 73.7 ± 13.1 years) who were diagnosed with dehydration based on vital signs, skin symptoms, and blood test findings by emergency medicine physicians. First, the attending physician of our department measured oral mucosal dryness. Subsequently, the emergency medicine physician blindly divided the severity of dehydration into three stages according to clinical findings and blood test results. In this study, the oral moisture-checking device (Mucus®; Life Co., Ltd., Saitama, Japan) was used to measure the oral mucosal dryness. We examined the oral moisture level for each dehydration severity level and the correlations of each severity level of dehydration with the measured values. Spearman's correlation coefficient (Medcalc version 11.3 for Windows) was used for statistical analysis. P < 0.05 indicated significant differences. Twenty-six patients were diagnosed with dry mouth, and a moderate negative correlation was found between the severity of dehydration and oral moisture degree (r = -0.686). The correlation coefficient for the relationship between oral moisture degree and severity of dehydration was -0.686, indicating a negative correlation (P < .05). These results suggest that the oral mucosal dryness may be a useful index of dehydration severity.


Assuntos
Desidratação/diagnóstico , Impedância Elétrica , Mucosa Bucal/fisiopatologia , Língua , Idoso , Idoso de 80 Anos ou mais , Desidratação/fisiopatologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Índice de Gravidade de Doença , Eletricidade Estática
14.
Health Commun ; 34(10): 1141-1149, 2019 09.
Artigo em Inglês | MEDLINE | ID: mdl-29683726

RESUMO

Rural, low-income families are disproportionately impacted by health problems owing to structural barriers (e.g., transportation, health insurance coverage) and personal barriers (e.g., health literacy). This paper presents a Participatory Action Research (PAR) model of co-created Core Health Messages (CHMs) in the areas of dental health, food security, health insurance, and physical activity. The research project engaged a multi-disciplinary team of experts to design initial health messages; rural, low-income mothers to respond to, and co-create, health messages; and stakeholders who work with families to share their insights. Findings reveal the perceptions of mothers and community stakeholders regarding messages and channels of message dissemination. By using PAR, a learner engagement approach, the researchers intend to increase the likelihood that the CHMs are culturally appropriate and relevant to specific populations. The CHM-PAR model visually illustrates an interactive, iterative process of health message generation and testing. The paper concludes with implications for future research and outreach in a technological landscape where dissemination channels are dynamic. This paper provides a model for researchers and health educators to co-create messages in a desired format (e.g., length, voice, level of empathy, tone) preferred by their audiences and to examine dissemination methods that will best reach those audiences.


Assuntos
Educação em Saúde/organização & administração , Mães/psicologia , Pobreza , População Rural , Comportamento do Consumidor , Competência Cultural , Exercício Físico , Feminino , Abastecimento de Alimentos/métodos , Pesquisa sobre Serviços de Saúde/métodos , Humanos , Seguro Saúde/organização & administração , Entrevistas como Assunto , Saúde Bucal/educação
15.
Appetite ; 135: 115-122, 2019 04 01.
Artigo em Inglês | MEDLINE | ID: mdl-30579878

RESUMO

Little is known about how low-income, rural mothers shape child eating behaviors. Descriptive and qualitative analysis of 55 mothers' surveys and in-depth interviews with 17 mothers in Washington state revealed a lack of alignment between mothers' intent to promote healthy child eating habits and counterproductive food parenting behaviors. Individual, family and community ecologies contributing to the divide included mothers' current nutrition knowledge, their childhood experiences, family food insecurity, housing issues preventing recommended practices, and a lack of public transportation or access to affordable grocery stores. The study highlights the need for educational programming that addresses contextual challenges and rural mothers' existing knowledge system to improve the family feeding environment.


Assuntos
Comportamento Infantil , Dieta , Comportamento Alimentar , Relações Mãe-Filho , Poder Familiar , Pobreza , População Rural , Adulto , Criança , Pré-Escolar , Família , Feminino , Abastecimento de Alimentos , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Intenção , Masculino , Mães , Obesidade Infantil/etiologia , Obesidade Infantil/prevenção & controle , Características de Residência , Fatores Socioeconômicos , Inquéritos e Questionários , Washington
16.
Fam Community Health ; 41(2): 73-82, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29461355

RESUMO

This study explores how low-income rural Latino children and their mothers differ from their non-Latino white counterparts in terms of health, well-being, and health care access. A subsample of non-Latino white (n = 201) and Latino (n = 157) children and their mothers was drawn from the Rural Families Speak about Health Project, a multistate, cross-sectional data set developed through mixed purposive sampling methods. Findings suggest that Latino children's families were disadvantaged in terms of child health and access to health care, whereas non-Latino white children's families were disadvantaged in terms of child behavior problems and maternal health and depression.


Assuntos
Acessibilidade aos Serviços de Saúde/tendências , Pobreza/etnologia , População Rural/tendências , Criança , Pré-Escolar , Estudos Transversais , Feminino , Hispânico ou Latino , Humanos , Masculino , População Branca
17.
Otolaryngol Head Neck Surg ; 158(4): 667-676, 2018 04.
Artigo em Inglês | MEDLINE | ID: mdl-29359615

RESUMO

Objective Peripheral blood-derived inflammation-based scores, such as the neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), and the combination of platelet count and NLR, have recently been proposed as prognostic markers in solid tumors. The purpose of this study was to investigate the validity of inflammatory markers as predictive prognostic factors for locally advanced oral squamous cell carcinoma (OSCC). In addition, we evaluated the potential correlation between systemic inflammation and local expression of COX2. Study Design Retrospective chart review and histologic analysis. Setting Tertiary referral academic center. Subjects and Methods We conducted a retrospective analysis of 94 patients with advanced OSCC treated with surgery at our hospital between 2007 and 2015. The relationship among patient survival, systemic inflammatory markers, and local COX2 expression was evaluated. Local COX2 expression in surgical specimens was measured by immunohistochemistry. Results High NLR and high PLR were associated with significantly shorter overall survival and cancer-specific survival. Multivariate analysis revealed that cN stage, NLR, and postoperative radiation/chemoradiation were significantly associated with overall survival and cancer-specific survival. PLR and combination of platelet count and NLR were significantly correlated with tumor expression of COX2. Finally, patients with cN2 stage disease and high local COX2 expression had a significantly worse prognosis than other patient groups. Conclusion Pretreatment inflammatory markers are useful as prognostic factors in advanced OSCC. Our study suggests that local COX2 may be affected by systemic inflammation and that the prognostic impact of COX2 expression depends on host factors and tumor characteristics.


Assuntos
Biomarcadores Tumorais/sangue , Contagem de Células Sanguíneas , Carcinoma de Células Escamosas/sangue , Ciclo-Oxigenase 2/metabolismo , Neoplasias Bucais/sangue , Adulto , Idoso , Idoso de 80 Anos ou mais , Carcinoma de Células Escamosas/patologia , Carcinoma de Células Escamosas/cirurgia , Feminino , Humanos , Técnicas Imunoenzimáticas , Inflamação/sangue , Masculino , Pessoa de Meia-Idade , Neoplasias Bucais/patologia , Neoplasias Bucais/cirurgia , Estadiamento de Neoplasias , Valor Preditivo dos Testes , Prognóstico , Estudos Retrospectivos , Taxa de Sobrevida
18.
Anticancer Res ; 37(3): 1417-1424, 2017 03.
Artigo em Inglês | MEDLINE | ID: mdl-28314313

RESUMO

BACKGROUND/AIM: Clinical trials with therapies targeting immune checkpoint molecules have shown promising results in several tumor types. However, the predictive and prognostic values of these immunological factors for locally advanced oral squamous cell carcinomas (LAOSCC) remain unclear. Our purpose was to evaluate the expression and prognostic value of programmed cell death-ligand1 (PD-L1) and PD-L2 and to correlate their expression with the degree of infiltration by CD8+ cells in LAOSCC. PATIENTS AND METHODS: A total of 84 patients with LAOSCC were included. PD-L1, PD-L2 and CD8 expression was detected in the tumor tissue using immunohistochemistry and was tested for correlation with clinical outcome. RESULTS: PD-L1 and PD-L2 were expressed in 52.4% and 23.8% of LAOSCC cases, respectively. PD-L1 positivity was significantly associated with superior disease-free (p=0.024) and overall (p=0.008) survival of the patients and retained significance in multivariate analysis. PD-L1 positivity was correlated with CD8 density. CONCLUSION: PD-L1 expression was associated with CD8+ tumor-infiltrating lymphocytes and better outcome in patients with LAOSCC.


Assuntos
Antígeno B7-H1/metabolismo , Carcinoma de Células Escamosas/metabolismo , Regulação Neoplásica da Expressão Gênica , Neoplasias Bucais/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Linfócitos T CD8-Positivos/metabolismo , Carcinoma de Células Escamosas/diagnóstico , Intervalo Livre de Doença , Feminino , Neoplasias de Cabeça e Pescoço/diagnóstico , Neoplasias de Cabeça e Pescoço/metabolismo , Humanos , Imuno-Histoquímica , Linfócitos do Interstício Tumoral/metabolismo , Masculino , Pessoa de Meia-Idade , Neoplasias Bucais/diagnóstico , Análise Multivariada , Metástase Neoplásica , Prognóstico , Proteína 2 Ligante de Morte Celular Programada 1/metabolismo , Estudos Retrospectivos , Resultado do Tratamento , Adulto Jovem
19.
Health Promot Pract ; 15(5): 646-53, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-24812194

RESUMO

Culturally appropriate oral health messages are found to be an effective tool to improve oral health among rural, low-income families. Yet knowledge on how to best achieve such messages is lacking. Based on participatory, learner-based approach, this study examined various oral health messages (varied length, detail, and voice) among 75 rural, low-income mothers in nine states in the theoretical framework of cultural appropriateness model. Specifically, we compared the process of our message creation to the differential effects of linguistic, peripheral, evidential, and sociocultural approaches. Results of qualitative analysis showed that low-income mothers, who represent a "rural culture," prefer messages that (a) have a clear and concise connection between recommendations presented in the message and future economic consequences of inaction, with sufficient explanation; (b) mention problem-specific economic struggles and inaccessibility of resources; (c) include the sources of fluoride, community barriers, availability of professional resources, and the quality of local water; and (d) contain the voice of a dental authority over the voice of other mothers. The applicability of cultural appropriateness framework and policy implications are discussed.


Assuntos
Planejamento em Saúde Comunitária , Cultura , Saúde da Família , Promoção da Saúde/organização & administração , Mães/psicologia , Saúde Bucal , Materiais de Ensino , Feminino , Humanos , Entrevistas como Assunto , Masculino , Pobreza , População Rural , Estados Unidos
20.
Am J Physiol Cell Physiol ; 293(1): C246-54, 2007 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-17392381

RESUMO

NHE1/SLC9A1 is a ubiquitous isoform of vertebrate Na(+)/H(+) exchangers (NHEs) functioning in maintaining intracellular concentrations of Na(+) and H(+) ions. Calcineurin homologous protein-1 (CHP1) binds to the hydrophilic region of NHE1 and regulates NHE1 activity but reportedly does not play a role in translocating NHE1 from the endoplasmic reticulum to the plasma membrane. However, an antiport function of NHE1 requiring CHP1 remains to be clarified. Here we established CHP1-deficient chicken B lymphoma DT40 cells by gene targeting to address CHP1 function. CHP1-deficient cells showed extensive decreases in Na(+)/H(+) activities in intact cells. Although NHE1 mRNA levels were not affected, NHE1 protein levels were significantly reduced not only in the plasma membrane but in whole cells. The expression of a CHP1 transgene in CHP1-deficient cells rescued NHE1 protein expression. Expression of mutant forms of CHP1 defective in Ca(2+) binding or myristoylation also partially decreased NHE1 protein levels. Knockdown of CHP1 also caused a moderate decrease in NHE1 protein in HeLa cells. These data indicate that CHP1 primarily plays an essential role in stabilization of NHE1 for reaching of NHE1 to the plasma membrane and its exchange activity.


Assuntos
Proteínas de Ligação ao Cálcio/metabolismo , Linfoma de Células B/metabolismo , Processamento de Proteína Pós-Traducional , Trocadores de Sódio-Hidrogênio/metabolismo , Amilorida/análogos & derivados , Amilorida/farmacologia , Animais , Cálcio/metabolismo , Proteínas de Ligação ao Cálcio/deficiência , Proteínas de Ligação ao Cálcio/genética , Proteínas de Transporte de Cátions/genética , Proteínas de Transporte de Cátions/metabolismo , Galinhas , Regulação para Baixo , Deleção de Genes , Células HeLa , Humanos , Linfoma de Células B/patologia , Mutação , Ácido Mirístico/metabolismo , Gambás , Ligação Proteica , Isoformas de Proteínas/metabolismo , Interferência de RNA , RNA Mensageiro/metabolismo , RNA Interferente Pequeno/genética , RNA Interferente Pequeno/metabolismo , Sódio/metabolismo , Trocador 1 de Sódio-Hidrogênio , Trocadores de Sódio-Hidrogênio/antagonistas & inibidores , Trocadores de Sódio-Hidrogênio/genética
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