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1.
JAMA ; 331(8): 702-705, 2024 02 27.
Artigo em Inglês | MEDLINE | ID: mdl-38300534

RESUMO

This study assesses differences in breastfeeding initiation trends between Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) participants and WIC-eligible nonparticipants before, during, and after the 2022 infant formula disruption.


Assuntos
Aleitamento Materno , Assistência Alimentar , Fórmulas Infantis , Feminino , Humanos , Lactente , Aleitamento Materno/estatística & dados numéricos , Assistência Alimentar/estatística & dados numéricos , Alimentos Formulados/provisão & distribuição , Fórmulas Infantis/provisão & distribuição , Estados Unidos/epidemiologia
3.
Appl Econ Perspect Policy ; 45(1): 350-371, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37192992

RESUMO

Using administrative records from Missouri, we investigate the characteristics of Supplemental Nutrition Assistance Program (SNAP) participants aged 60 and older who experience administrative churn. Among these adults, 1 in 4 experienced administrative churn, and 1 in 5 experienced more than one spell of churn. Risk of churn, frequency, duration of churn spells, and the value of foregone SNAP benefits varied with individual, household, and geographic characteristics, and was more common among non-whites, members of larger households, and those living in urban areas. Our findings suggest that a significant portion of older adults experience gaps in SNAP benefit receipt.

4.
Am J Hypertens ; 36(9): 485-490, 2023 08 05.
Artigo em Inglês | MEDLINE | ID: mdl-37225664

RESUMO

BACKGROUND: Black people are more likely to be diagnosed with hypertension and to experience food insecurity and antihypertensive medication non-adherence compared to White people in the U.S. The Supplemental Nutrition Assistance Program (SNAP)-a means-tested program that targets food insecurity has been shown to affect health outcomes. This study analyzed the relationship between SNAP participation and antihypertensive medication adherence among older Black Medicaid-insured individuals. METHODS: This is a retrospective cohort study using linked 2006-2014 state of Missouri Medicaid and SNAP administrative claims data. Analyses were restricted to older (≥60 years) Black individuals who were continuously enrolled in Medicaid for 12 months following their first observed claim for hypertension at or after age 60 years with at least one pharmacy claim (n = 10,693). Our outcome measure is a dichotomous measure of antihypertensive medication adherence defined using the Proportion of Days Covered (≥80% PDC = 1). The exposure variables are four measures of SNAP participation. RESULTS: A higher proportion of SNAP participants were adherent to their antihypertensive medications compared to non-SNAP participants (43.5% vs. 32.0%). On multivariable analyses, compared to non-SNAP participants there was an increased likelihood of antihypertensive medication adherence among SNAP participants (prevalence ratio [PR] = 1.25; 95% confidence interval [CI] = 1.16-1.35). Compared to those who participated in SNAP for 1-3 months during the 12-month continuous enrollment, there was an increased likelihood of antihypertensive medication adherence among those who were enrolled for 10-12 months (PR = 1.41; 95% CI = 1.08-1.85). CONCLUSIONS: Medicaid-insured older Black adults who were SNAP participants had a higher likelihood of antihypertensive medication adherence compared to non-SNAP participants.


Assuntos
Assistência Alimentar , Hipertensão , Adesão à Medicação , Humanos , Pessoa de Meia-Idade , Anti-Hipertensivos/uso terapêutico , População Negra , Hipertensão/diagnóstico , Hipertensão/tratamento farmacológico , Hipertensão/epidemiologia , Medicaid , Estudos Retrospectivos , Estados Unidos/epidemiologia
5.
Nutrients ; 15(3)2023 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-36771472

RESUMO

The Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) provides supplemental foods and nutritional education to low-income women and children up to the age of five. Despite evidence that WIC improves diet and nutrition and the nationwide availability of this program, many participants exit WIC before they are no longer eligible for benefits. To date no study has systematically reviewed factors that influence participants' exits from WIC. The study systematically reviewed the relevant literature to identify factors related to discontinuing participation in WIC before children reach the age of five and 1503 citations were reviewed, 19 articles were read for full text review and eight studies met inclusion criteria. Participants' higher socioeconomic status, attitudes and behaviors around breastfeeding, having shorter prenatal participation in WIC, administrative barriers, confusion regarding program eligibility, feelings of stigma and embarrassment at the store checkout lines, personal and family challenges, dissatisfaction with insufficient fruit and vegetables benefits and living in suburban areas or in the Southern US were salient factors that influenced WIC exits. These findings will be of interest to policymakers and stakeholders as they consider ways to increase participation and retention through program modernization and innovations.


Assuntos
Dieta , Assistência Alimentar , Gravidez , Humanos , Lactente , Criança , Feminino , Verduras , Frutas , Aleitamento Materno , Educação em Saúde
6.
Nutrients ; 15(2)2023 Jan 14.
Artigo em Inglês | MEDLINE | ID: mdl-36678317

RESUMO

The Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) plans to allow participants to redeem their food package benefits online, i.e., online ordering. As grocery shopping online has become more common, companies have developed strategies to market food products to customers using online (or mobile) grocery shopping platforms. There is a significant knowledge gap in how these strategies may influence WIC participants who choose to shop for WIC foods online. This review examines the relevant literature to (1) identify food marketing strategies used in online grocery shopping platforms, (2) understand how these strategies influence consumer behavior and consumer diet, and (3) consider the implications for WIC participants. A total of 1862 references were identified from a systematic database search, of which 83 were included for full-text screening and 18 were included for data extraction and evidence synthesis. The included studies provide policymakers and other stakeholders involved in developing WIC online order processes with valuable information about the factors that shape healthy food choices in the online food retail environment. Findings indicate that some marketing interventions, such as nutrition labeling and food swaps, may encourage healthier food choices in the online environment and could potentially be tailored to reinforce WIC messaging about a healthy diet.


Assuntos
Assistência Alimentar , Lactente , Criança , Humanos , Feminino , Alimentos , Marketing , Dieta , Preferências Alimentares , Comportamento do Consumidor , Abastecimento de Alimentos
7.
J Nutr Educ Behav ; 55(3): 170-181, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-36642586

RESUMO

OBJECTIVE: Describe long-term breastfeeding initiation trends by prenatal Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) participation and race/ethnicity. DESIGN: Cross-sectional study of birth certificate data from 2009 to 2017 in 24 states that adopted the 2003 birth certificate revision by 2009. PARTICIPANTS: Term births with hospital costs covered by Medicaid (N = 6,402,704). MAIN OUTCOME MEASURES: Breastfeeding initiation. ANALYSIS: The descriptive characteristics of WIC participants and WIC-eligible nonparticipants were compared by year and race/ethnicity using the chi-square test of independence or t tests. Adjusted breastfeeding initiation prevalence was estimated using linear regression models with county fixed effects, controlling for sociodemographic and obstetric/health factors. Trends were compared by WIC status overall and within racial/ethnic groups. Differences and P values were assessed using interaction terms between WIC and year. RESULTS: Breastfeeding initiation increased for WIC participants and nonparticipants. Special Supplemental Nutrition Program for Women, Infants, and Children participants had lower adjusted breastfeeding initiation (2009: 69.0%; 2017: 78.5%) than nonparticipants (2009: 70.8%; 2017: 80.1%) (P < 0.001 per year). Breastfeeding initiation increased more rapidly in WIC participants than in nonparticipants for non-Hispanic Asian/Pacific Islander (21.4% and 8.6%, respectively; P < 0.001) and American Indian/Alaskan Native (13.6% and 8.1%, respectively; P = 0.02)-narrowing the gap between WIC participants and nonparticipants over time. CONCLUSIONS AND IMPLICATIONS: Annual birth certificate data provide detailed information for monitoring trends and disparities in breastfeeding initiation by prenatal WIC status. These findings can inform WIC and maternal child health program efforts to improve breastfeeding promotion for populations with low-income and racial/ethnic groups.


Assuntos
Aleitamento Materno , Assistência Alimentar , Gravidez , Estados Unidos , Lactente , Humanos , Feminino , Criança , Etnicidade , Medicaid , Estudos Transversais , Pobreza
8.
J Gen Intern Med ; 38(6): 1349-1356, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-36707458

RESUMO

BACKGROUND: Food insecurity has been associated with medication non-adherence among individuals living with chronic diseases like hypertension. The relationship between Supplemental Nutrition Assistance Program (SNAP)-a public program that addresses food insecurity-and Medication adherence among older Medicaid-insured adults living with hypertension is not clear. OBJECTIVE: To analyze the association between patterns of SNAP participation and adherence to antihypertensive medications among older Medicaid-insured individuals. DESIGN: Retrospective study using linked 2006-2014 state of Missouri's Medicaid claims and Supplemental Nutrition Assistance Program data. PARTICIPANTS: Older adults (≥ 60 years) who were continuously enrolled in Medicaid for 12 months following their first observed claim for hypertension at or after age 60. MAIN MEASURES: The outcome measure was medication adherence assessed using the proportion of days covered (PDC). The exposure measures were as follows: (1) receipt of SNAP benefits (no [0], yes [1]); (2) SNAP benefits receipt during the 12-month Medicaid continuous enrollment (no [0], yes [1]); (3) duration of SNAP participation during the 12-month continuous Medicaid enrollment; and (4) SNAP participation pattern. KEY RESULTS: On multivariable analyses, there was a statistically significant association between ever participating in SNAP and medication adherence (ß = 0.32; S.E. = 0.011). Compared to those who participated in SNAP for 1-3 months during the 12-month continuous enrollment, there was an increased likelihood of medication adherence among those who were enrolled for 10-12 months (ß = 0.44, S.E. = 0.041). CONCLUSIONS: Medicaid-insured older adults who are SNAP participants or enrolled in SNAP for 10-12 months of a 12-month Medicaid continuous enrollment period are more likely to be adherent to antihypertensive medication compared to non-SNAP participants or those enrolled for 1-3 months, respectively.


Assuntos
Assistência Alimentar , Hipertensão , Estados Unidos/epidemiologia , Humanos , Idoso , Pessoa de Meia-Idade , Medicaid , Anti-Hipertensivos/uso terapêutico , Estudos Retrospectivos , Hipertensão/tratamento farmacológico , Hipertensão/epidemiologia , Adesão à Medicação
9.
Res High Educ ; 63(6): 987-1014, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35043032

RESUMO

While some stakeholders presume that studying abroad distracts students from efficient pursuit of their programs of study, others regard education abroad as a high impact practice that fosters student engagement and hence college completion. The Consortium for Analysis of Student Success through International Education (CASSIE), compiled semester-by-semester records from 221,981 students across 35 institutions. Of those students, 30,549 had studied abroad. Using nearest-neighbor matching techniques that accounted for a myriad of potentially confounding variables along with matching on institution, the analysis found positive impacts of education abroad on graduation within 4 and 6 years and on cumulative GPA at graduation. A very small increase in credit hours earned emerged, counterbalanced by a small decrease in time-to-degree associated with studying abroad. Overall, the results warrant conclusions that studying abroad does not impede timely graduation. To the contrary, encouraging students to study abroad promotes college completion. These results held similarly for students who had multiple study abroad experiences, and who have studied abroad for varying program lengths.

10.
J Appl Gerontol ; 41(3): 780-787, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-34137290

RESUMO

The burdens of chronic diseases such as hypertension and diabetes for older Americans are profound. Yet, data on the population-level prevalence of hypertension and diabetes among the older adult Supplemental Nutritional Assistance Program (SNAP) population and the associated level of medication adherence is lacking despite evidence of the "treat or eat" trade-off in the general population. We used linked administrative data from SNAP and Medicaid between 2006 and 2014 in the state of Missouri to document rates of hypertension or diabetes diagnoses and medication adherence. About 69% of the study sample were found to be diagnosed with a hypertension and 40% with diabetes. Approximately 1 in 4 of those living with hypertension and 1 and 3 of those living with diabetes were nonadherent to antihypertensive or antidiabetic medications each year, on average. Furthermore, medication non-adherence increases with age and is more common among non-White and urban residents.


Assuntos
Diabetes Mellitus , Hipertensão , Idoso , Anti-Hipertensivos/uso terapêutico , Diabetes Mellitus/tratamento farmacológico , Diabetes Mellitus/epidemiologia , Humanos , Hipertensão/tratamento farmacológico , Hipertensão/epidemiologia , Hipoglicemiantes/uso terapêutico , Adesão à Medicação , Estados Unidos/epidemiologia
11.
SSM Popul Health ; 15: 100910, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34553015

RESUMO

Well-child visits are protective for child health but underutilized in the United States. The Supplemental Nutrition Assistance Program (SNAP), the largest federal food assistance program in the United States, has been shown to reduce food insecurity and may also promote child health by supporting preventative health care utilization. We examined the relationship between SNAP participation and infant well-child visits using state administrative data from Missouri's Department of Social Services for the period January 2006 to July 2014 for more than 50,000 infant-mother dyads. We find that compared to always receiving SNAP, leaving SNAP or receiving SNAP unstably reduces the likelihood that an infant receives all recommended well-child visits in the first year. These patterns are more pronounced for infants living in urban areas, infants with Black or Hispanic mothers, and infants whose mothers are diagnosed with depression. We also find that stable SNAP participation primarily influences vaccination rates through well-child visits, which is when most infants receive their immunizations. Given the increased public health risk of foregone care, these results may inform policy makers as they consider making permanent policy waivers to reduce the administrative burden of the recertification process and increase the stability of SNAP participation.

12.
Med Care ; 58(1): 33-37, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31688555

RESUMO

BACKGROUND: Administrative churn occurs when a household exits the Supplemental Nutrition Assistance Program (SNAP) and then returns to the program within 4 months. Although a number of studies have examined health care utilization patterns related to Medicaid administrative churn less is known about health care utilization patterns among Medicaid-insured SNAP enrollees. OBJECTIVES: To investigate the characteristics and health care utilization patterns of Medicaid insured SNAP participants who experience SNAP administrative churn. RESEARCH DESIGN: Retrospective cohort study using 2010-2013 SNAP benefit data from the state of Missouri linked to Medicaid claims data for the same time period. Individual fixed effect regression analysis was used to investigate differences in health care claims for churners and nonchurners across various health care settings. SUBJECTS: Missouri residents ages 18-64 who were Medicaid-insured SNAP enrollees. MEASURES: Inpatient, outpatient, emergency department (ED), and pharmacy claims, and churn status. RESULTS: Half of our sample (49.63%) experienced administrative churn. In the descriptive analyses, churners had fewer claims for prescription drugs than nonchurners (25.42% vs. 30.47%), but more claims for ED visits (3.79% vs. 2.74%). Adjusting for individual fixed characteristics, inpatient claims occurred with more frequency during periods of churn than while on SNAP, whereas ED, outpatient, and pharmacy claims occurred with less frequency during periods of churn than while on SNAP. CONCLUSIONS: SNAP administrative churn was very common among our study sample. Given that health care utilization patterns varied for churners compared with nonchurners, it is important that researchers and public health professionals not assume stable SNAP receipt among participants.


Assuntos
Assistência Alimentar/estatística & dados numéricos , Medicaid/estatística & dados numéricos , Aceitação pelo Paciente de Cuidados de Saúde/estatística & dados numéricos , Adolescente , Adulto , Feminino , Humanos , Pacientes Internados/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Missouri , Pacientes Ambulatoriais/estatística & dados numéricos , Assistência Farmacêutica/estatística & dados numéricos , Análise de Regressão , Estudos Retrospectivos , Estados Unidos , Adulto Jovem
13.
Soc Sci Med ; 220: 203-211, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30453112

RESUMO

Anecdotal and descriptive evidence has led to the claim that some low-income households may face a "eat or breathe" tradeoff, but quantitative evidence is scarce. We link Medicaid claims data to monthly Supplemental Nutritional Assistance Program (SNAP) participation data from the state of Missouri from 2010 to 2013 to explore monthly patterns in children's emergency room (ER) claims for asthma and to examine whether these patterns are sensitive to the timing and amount of SNAP benefits. This allows us to empirically test whether SNAP households with Medicaid insurance face trade-offs between food and medicine that increases the likelihood that a child in a SNAP and Medicaid household will go to the ER for asthma at the end of the month. While we do not find overwhelming evidence that the timing of SNAP benefits receipt are associated with the timing of asthma-related ER visits, we do find clear evidence that increased SNAP benefits are associated with a reduction in the overall probability of an asthma-related ER visit.


Assuntos
Asma/epidemiologia , Assistência Alimentar , Abastecimento de Alimentos , Adolescente , Criança , Pré-Escolar , Serviço Hospitalar de Emergência/estatística & dados numéricos , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Medicaid/estatística & dados numéricos , Missouri/epidemiologia , Inquéritos Nutricionais , Pobreza , Estados Unidos
14.
J Exp Child Psychol ; 166: 327-339, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28992612

RESUMO

Children produce iconic gestures conveying action information earlier than the ones conveying attribute information (Özçaliskan, Gentner, & Goldin-Meadow, 2014). In this study, we ask whether children's comprehension of iconic gestures follows a similar pattern, also with earlier comprehension of iconic gestures conveying action. Children, ages 2-4years, were presented with 12 minimally-informative speech+iconic gesture combinations, conveying either an action (e.g., open palm flapping as if bird flying) or an attribute (e.g., fingers spread as if bird's wings) associated with a referent. They were asked to choose the correct match for each gesture in a forced-choice task. Our results showed that children could identify the referent of an iconic gesture conveying characteristic action earlier (age 2) than the referent of an iconic gesture conveying characteristic attribute (age 3). Overall, our study identifies ages 2-3 as important in the development of comprehension of iconic co-speech gestures, and indicates that the comprehension of iconic gestures with action meanings is easier than, and may even precede, the comprehension of iconic gestures with attribute meanings.


Assuntos
Compreensão , Gestos , Fatores Etários , Pré-Escolar , Feminino , Humanos , Masculino , Fala
15.
Public Health Nutr ; 20(7): 1314-1321, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-27964772

RESUMO

OBJECTIVE: The present study examines the connection between the timing and size of Supplemental Nutrition Assistance Program (SNAP) benefits and the occurrence of emergency room (ER) visits for hypoglycaemia, a condition that is highly sensitive to short-term changes in nutritional intake. DESIGN: We used administrative data from Missouri SNAP and Medicaid to identify the timing of issuance and the benefit size of SNAP and the timing of ER claims for hypoglycaemia. We estimated the probability of submitting an ER claim for hypoglycaemia as a function of the calendar week, SNAP benefit week and the size of the SNAP benefit in models that controlled for individual demographic characteristics. SETTING: Missouri SNAP caseload from January 2010 to December 2013 linked to adult Medicaid claims data for the same time period. SUBJECTS: ER claims submitted to Medicaid (n 6 508 061). RESULTS: The results indicated no evidence of a SNAP benefit cycle or monthly cycle to ER claims for hypoglycaemia. However, the analysis did find that ER claims for hypoglycaemia are related to the size of the SNAP benefit. CONCLUSIONS: These results suggest that more generous SNAP benefits help households avoid nutritional fluctuations in the quality and quantity of food that might result in low blood sugar, thus necessitating fewer ER visits for hypoglycaemia.


Assuntos
Serviço Hospitalar de Emergência/estatística & dados numéricos , Assistência Alimentar , Hipoglicemia/epidemiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Relação Dose-Resposta a Droga , Características da Família , Feminino , Abastecimento de Alimentos , Humanos , Hipoglicemia/prevenção & controle , Masculino , Pessoa de Meia-Idade , Missouri , Política Nutricional , Estado Nutricional , Pobreza , Estudos Retrospectivos , Sensibilidade e Especificidade , Adulto Jovem
16.
J Cell Biochem ; 103(2): 624-35, 2008 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-17562544

RESUMO

We have reported that nordihydroguaiaretic acid (NDGA) inhibits the tyrosine kinase activities of the IGF-1 receptor (IGF-1R) and the HER2 receptor in breast cancer cells. Herein, we studied the effects of NDGA on the growth of estrogen receptor (ER) positive MCF-7 cells engineered to overexpress HER2 (MCF-7/HER2-18). These cells are an in vitro model of HER2-driven, ER positive, tamoxifen resistant breast cancer. NDGA was equally effective at inhibiting the growth of both parental MCF-7 and MCF-7/HER2-18 cells. Half maximal effects for both cell lines were in the 10-15 microM range. The growth inhibitory effects of NDGA were associated with an S phase arrest in the cell cycle and the induction of apoptosis. NDGA inhibited both IGF-1R and HER2 kinase activities in these breast cancer cells. In contrast, Gefitinib, an epidermal growth factor receptor inhibitor but not an IGF-1R inhibitor, was more effective in MCF-7/HER2-18 cells than in the parental MCF-7 cells and IGF binding protein-3 (IGFBP-3) was more effective against MCF-7 cells compared to MCF-7/HER2-18. MCF-7/HER2-18 cells are known to be resistant to the effects of the estrogen receptor inhibitor, tamoxifen. Interestingly, NDGA not only inhibited the growth of MCF-7/HER2-18 on its own, but it also demonstrated additive growth inhibitory effects when combined with tamoxifen. These studies suggest that NDGA may have therapeutic benefits in HER2-positive, tamoxifen resistant, breast cancers in humans.


Assuntos
Adenocarcinoma/patologia , Antineoplásicos/farmacologia , Neoplasias da Mama/patologia , Masoprocol/farmacologia , Proteínas de Neoplasias/antagonistas & inibidores , Neoplasias Hormônio-Dependentes/patologia , Inibidores de Proteínas Quinases/farmacologia , Receptor ErbB-2/antagonistas & inibidores , Receptor IGF Tipo 1/antagonistas & inibidores , Adenocarcinoma/metabolismo , Antineoplásicos Hormonais/farmacologia , Apoptose/efeitos dos fármacos , Neoplasias da Mama/metabolismo , Divisão Celular/efeitos dos fármacos , Linhagem Celular Tumoral/efeitos dos fármacos , Linhagem Celular Tumoral/metabolismo , Ensaios de Seleção de Medicamentos Antitumorais , Sinergismo Farmacológico , Feminino , Gefitinibe , Humanos , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/farmacologia , Proteínas de Neoplasias/biossíntese , Proteínas de Neoplasias/genética , Neoplasias Hormônio-Dependentes/metabolismo , Fosforilação/efeitos dos fármacos , Processamento de Proteína Pós-Traducional/efeitos dos fármacos , Quinazolinas/farmacologia , Receptor ErbB-2/biossíntese , Receptor ErbB-2/genética , Moduladores Seletivos de Receptor Estrogênico/farmacologia , Tamoxifeno/farmacologia
17.
Mol Cancer Res ; 1(4): 300-11, 2003 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-12612058

RESUMO

Tamoxifen is a widely used breast cancer therapeutic and preventative agent. Although functioning as an estrogen antagonist at the cellular level, transcriptional profiling revealed that at the molecular level, tamoxifen functions largely as an agonist, virtually recapitulating the gene expression profile induced in breast cancer cells by estrogen. Remarkably, tamoxifen induces transcription factors and genes involved in promoting cell cycle progression including fos, myc, myb, cdc25a, cyclins E and A2, and stk15 with kinetics that paralleled that of cells cycling in response to estrogen, even though tamoxifen-treated cells are not transiting through the cell cycle. Induction of cell cycle-associated genes was specific for tamoxifen, and did not occur with raloxifene. However, cyclin D1 was a key estrogen-induced gene not expressed in response to tamoxifen or raloxifene but constitutively expressed in tamoxifen-resistant cells.


Assuntos
Antineoplásicos/farmacologia , Neoplasias da Mama/genética , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Genes cdc/fisiologia , Tamoxifeno/análogos & derivados , Tamoxifeno/farmacologia , Neoplasias da Mama/patologia , Divisão Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Estrogênios/metabolismo , Estrogênios/farmacologia , Perfilação da Expressão Gênica , Humanos , Análise de Sequência com Séries de Oligonucleotídeos , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Tamoxifeno/metabolismo , Fatores de Tempo
18.
Mol Cell Endocrinol ; 196(1-2): 11-20, 2002 Oct 31.
Artigo em Inglês | MEDLINE | ID: mdl-12385821

RESUMO

Uterine leiomyomas develop in reproductive-age women with high frequency and are dependent on the production of ovarian hormones. While it is generally accepted that these tumors are estrogen (E(2))-responsive, the role of progesterone (P(4)) in modulating tumor growth is less clear. In the present study, an in vivo/in vitro rat model was used to characterize progesterone receptor (PR) isoform expression in uterine leiomyoma and investigate PR signaling using progestins and antiprogestins in the leiomyoma-derived cell line ELT-3. PR-A was the predominant isoform expressed in normal myometrium, leiomyomas and ELT3 cells. In the normal myometrium, PR-A and PR-B levels varied during the estrous cycle with low ratios of PR-A relative to PR-B (PR-A/PR-B) coinciding with times of cell proliferation. Although PR ligands had no effect on basal levels of uterine leiomyoma cell proliferation in vitro, both progestins and antiprogestins inhibited E(2)-stimulated cell proliferation. In addition, E(2)-stimulated transactivation of an estrogen-response-element reporter gene as well as E(2)-induced upregulation of the PR were also inhibited by PR ligands. These data indicate that PR ligands can transdominantly suppress estrogen receptor signaling and stimulation of uterine leiomyoma cell growth.


Assuntos
Leiomioma/patologia , Receptores de Estrogênio/fisiologia , Receptores de Progesterona/fisiologia , Neoplasias Uterinas/patologia , Animais , Divisão Celular/efeitos dos fármacos , Estradiol/farmacologia , Ciclo Estral/metabolismo , Feminino , Ligantes , Miométrio/citologia , Progestinas/farmacologia , Ratos , Receptores de Progesterona/análise , Transdução de Sinais/efeitos dos fármacos , Transcrição Gênica/efeitos dos fármacos , Células Tumorais Cultivadas
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