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1.
Int J Equity Health ; 20(1): 210, 2021 09 23.
Artigo em Inglês | MEDLINE | ID: mdl-34556148

RESUMO

BACKGROUND: Health care workers in Kenya have launched major strikes in the public health sector in the past decade but the impact of strikes on health systems is under-explored. We conducted a qualitative study to investigate maternal and child health care and services during nationwide strikes by health care workers in 2017 from the perspective of pregnant women, community health volunteers (CHVs), and health facility managers. METHODS: We conducted in-depth interviews and focus group discussions (FGDs) with three populations: women who were pregnant in 2017, CHVs, and health facility managers. Women who were pregnant in 2017 were part of a previous study. All participants were recruited using convenience sampling from a single County in western Kenya. Interviews and FGDs were conducted in English or Kiswahili using semi-structured guides that probed women's pregnancy experiences and maternal and child health services in 2017. Interviews and FGDs were audio-recorded, translated, and transcribed. Content analysis followed a thematic framework approach using deductive and inductive approaches. RESULTS: Forty-three women and 22 CHVs participated in 4 FGDs and 3 FGDs, respectively, and 8 health facility managers participated in interviews. CHVs and health facility managers were majority female (80%). Participants reported that strikes by health care workers significantly impacted the availability and quality of maternal and child health services in 2017 and had indirect economic effects due to households paying for services in the private sector. Participants felt it was the poor, particularly poor women, who were most affected since they were more likely to rely on public services, while CHVs highlighted their own poor working conditions in response to strikes by physicians and nurses. Strikes strained relationships and trust between communities and the health system that were identified as essential to maternal and child health care. CONCLUSION: We found that the impacts of strikes by health care workers in 2017 extended beyond negative health and economic effects and exacerbated fundamental inequities in the health system. While this study was conducted in one County, our findings suggest several potential avenues for strengthening maternal and child health care in Kenya that were highlighted by nationwide strikes in 2017.


Assuntos
Atitude Frente a Saúde , Serviços de Saúde Materno-Infantil , Greve , Adolescente , Adulto , Agentes Comunitários de Saúde/psicologia , Agentes Comunitários de Saúde/estatística & dados numéricos , Feminino , Grupos Focais , Administradores de Instituições de Saúde/psicologia , Administradores de Instituições de Saúde/estatística & dados numéricos , Humanos , Quênia , Masculino , Serviços de Saúde Materno-Infantil/organização & administração , Pessoa de Meia-Idade , Gravidez , Gestantes/psicologia , Pesquisa Qualitativa , Voluntários/psicologia , Voluntários/estatística & dados numéricos , Adulto Jovem
2.
BMC Health Serv Res ; 21(1): 898, 2021 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-34465317

RESUMO

BACKGROUND: There have been dozens of strikes by health workers in Kenya in the past decade, but there are few studies of their impact on maternal and child health services and outcomes. We conducted a retrospective survey study to assess the impact of nationwide strikes by health workers in 2017 on utilization of maternal and child health services in western Kenya. METHODS: We utilized a parent study to enroll women who were pregnant in 2017 when there were prolonged strikes by health workers ("strike group") and women who were pregnant in 2018 when there were no major strikes ("control group"). Trained research assistants administered a close-ended survey to retrospectively collect demographic and pregnancy-related health utilization and outcomes data. Data were collected between March and July 2019. The primary outcomes of interest were antenatal care (ANC) visits, delivery location, and early child immunizations. Generalized estimating equations were used to estimate risk ratios between the strike and control groups, adjusting for socioeconomic status, health insurance status, and clustering. Adjusted risk ratios (ARR) were calculated with 95% confidence intervals (95%CI). RESULTS: Of 1341 women recruited in the parent study in 2017 (strike group), we re-consented 843 women (63%) to participate. Of 924 women recruited in the control arm of the parent study in 2018 (control group), we re-consented 728 women (79%). Women in the strike group were 17% less likely to attend at least four ANC visits during their pregnancy (ARR 0.83, 95%CI 0.74, 0.94) and 16% less likely to deliver in a health facility (ARR 0.84, 95%CI 0.76, 0.92) compared to women in the control group. Whether a child received their first oral polio vaccine did not differ significantly between groups, but children of women in the strike group received their vaccine significantly longer after birth (13 days versus 7 days, p = 0.002). CONCLUSION: We found that women who were pregnant during nationwide strikes by health workers in 2017 were less likely to receive WHO-recommended maternal child health services. Strategies to maintain these services during strikes are urgently needed.


Assuntos
Serviços de Saúde Materna , Cuidado Pré-Natal , Criança , Saúde da Criança , Feminino , Humanos , Quênia/epidemiologia , Aceitação pelo Paciente de Cuidados de Saúde , Gravidez , Estudos Retrospectivos
3.
Am J Obstet Gynecol ; 222(5): 451-468.e9, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-31589865

RESUMO

BACKGROUND: Changes in menstrual bleeding concern many users of the 52 mg Levonorgestrel Intrauterine System. Prescribing information for Levonorgestrel Intrauterine System devices describe an overall decrease in bleeding and spotting days over time; however, estimates derived from a variety of existing clinical data are currently unavailable. OBJECTIVE: The objective of the study was to systematically calculate the mean days of bleeding-only, spotting-only, and bleeding and/or spotting experienced by a population of reproductive-aged Levonorgestrel Intrauterine System users with normal regular menses prior to insertion during the first year of use. DATA SOURCES: We identified clinical trials, including randomized controlled trials and randomized comparative trials, as well as cohort studies published in English between January 1970 and November 2018 through searching 12 biomedical and scientific literature databases including MEDLINE and ClinicalTrials.gov. STUDY ELIGIBILITY CRITERIA: We considered studies that reported data on Levonorgestrel Intrauterine System devices releasing 20 µg of levonorgestrel per day, collected daily menstrual bleeding data for at least 90 consecutive days, defined bleeding and spotting per World Health Organization standards and evaluated participants with normal regular menses prior to insertion. STUDY APPRAISAL AND SYNTHESIS METHODS: We assessed study quality using established guidelines. Two reviewers independently conducted all review stages and rated the quality of evidence for each article; any disagreements were resolved by a third. Where possible, we pooled data using a random-effects model. RESULTS: Among 3403 potentially relevant studies, we included 7 in our meta-analysis. We calculated the mean days of bleeding-only, spotting-only, and bleeding and/or spotting for the first four 90 day intervals after Levonorgestrel Intrauterine System insertion. Combined menstrual bleeding and/or spotting days gradually decreased throughout the first year, from 35.6 days (95% confidence interval, 32.2-39.1) during the first 90 day interval to 19.1 (95% confidence interval, 16.6-21.5), 14.2 (95% confidence interval, 11.7-16.8), and 11.7 days (95% confidence interval, 9.7-13.7) in the second, third, and fourth intervals. Measures for bleeding-only and spotting-only days similarly decreased throughout the first year, with the greatest decreases occurring between the first and second intervals. CONCLUSION: Our study provides 90 day reference period measures that characterize menstrual patterns for Levonorgestrel Intrauterine System users with normal regular menses prior to insertion during the first year of use. Our findings provide broader generalizability and more detail than patterns described in the prescribing information. These findings quantify an overall decrease in menstrual bleeding days with longer duration of use, with the greatest decrease occurring between months 3 and 6. Accurately establishing expectations with the Levonorgestrel Intrauterine System may improve informed selection and decrease discontinuation.


Assuntos
Anticoncepcionais Femininos , Dispositivos Intrauterinos Medicados , Metrorragia , Adulto , Feminino , Humanos , Levanogestrel/uso terapêutico , Menstruação , Fatores de Tempo
4.
BMC Pregnancy Childbirth ; 20(1): 288, 2020 May 12.
Artigo em Inglês | MEDLINE | ID: mdl-32398156

RESUMO

BACKGROUND: Chamas for Change (Chamas) is a group-based health education and microfinance program for pregnant and postpartum women that aims to address inequities contributing to high rates of maternal and infant mortality in rural western Kenya. In this prospective matched cohort study, we evaluated the association between Chamas participation and facility-based delivery. We additionally explored the effect of participation on promoting other positive maternal, newborn and child health (MNCH) behaviors. METHODS: We prospectively compared outcomes between a cohort of Chamas participants and controls matched for age, parity, and prenatal care location. Between October-December 2012, government-sponsored community health volunteers (CHV) recruited pregnant women attending their first antenatal care (ANC) visits at rural health facilities in Busia County to participate in Chamas. Women enrolled in Chamas agreed to attend group-based health education and microfinance sessions for one year; controls received the standard of care. We used descriptive analyses, multivariable logistic regression models, and random effect models to compare outcomes across cohorts 12 months following enrollment, with α set to 0.05. RESULTS: Compared to controls (n = 115), a significantly higher proportion of Chamas participants (n = 211) delivered in a health facility (84.4% vs. 50.4%, p < 0.001), attended at least four ANC visits (64.0% vs. 37.4%, p < 0·001), exclusively breastfed to six months (82.0% vs. 47.0%, p < 0·001), and received a CHV home visit within 48 h postpartum (75.8% vs. 38.3%, p < 0·001). In multivariable models, Chamas participants were over five times as likely as controls to deliver in a health facility (OR 5.49, 95% CI 3.12-9.64, p < 0.001). Though not significant, Chamas participants experienced a lower proportion of stillbirths (0.9% vs. 5.2%), miscarriages (5.2% vs. 7.8%), infant deaths (2.8% vs. 3.4%), and maternal deaths (0.9% vs. 1.7%) compared to controls. CONCLUSIONS: Chamas participation was associated with increased odds of facility-based delivery compared to the standard of care in rural western Kenya. Larger proportions of program participants also practiced other positive MNCH behaviors. Our findings demonstrate Chamas' potential to achieve population-level MNCH benefits; however, a larger study is needed to validate this observed effect. TRIAL REGISTRATION: ClinicalTrials.gov, NCT03188250 (retrospectively registered 31 May 2017).


Assuntos
Saúde da Criança , Apoio Financeiro , Comportamentos Relacionados com a Saúde , Promoção da Saúde/métodos , Saúde do Lactente , Saúde Materna , Adulto , Estudos de Casos e Controles , Criança , Estudos de Coortes , Agentes Comunitários de Saúde , Feminino , Educação em Saúde/métodos , Instalações de Saúde , Humanos , Recém-Nascido , Quênia , Cuidado Pós-Natal , Gravidez , Cuidado Pré-Natal , Estudos Prospectivos , População Rural , Adulto Jovem
5.
Am J Perinatol ; 37(11): 1146-1154, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-31189187

RESUMO

OBJECTIVE: This study aimed to evaluate the association between a patient's travel time to clinic and her prenatal care attendance. STUDY DESIGN: We conducted a retrospective cohort study of women (≥18 years) who received prenatal care and delivered at North Carolina Women's Hospital between July 1, 2014, and June 30, 2016 (n = 2,808 women, 24,021 appointments). We queried demographic data from the electronic medical record and calculated travel time with ArcGIS. Multinomial logistic regression models estimated the association between travel time and attendance, adjusted for sociodemographic covariates. RESULTS: For every 10 minutes of additional travel time, women were 1.05 (95% confidence interval [CI]: 1.02-1.08, p < 0.001) times as likely to arrive late and 1.03 (95% CI: 1.01-1.04, p < 0.001) times as likely to cancel appointments than arrive on time. Travel time did not significantly affect a patient's likelihood of not showing for appointments. Non-Hispanic black patients were 71% more likely to arrive late and 51% more likely to not show for appointments than non-Hispanic white patients (p < 0.05). Publicly insured women were 28% more likely to arrive late to appointments and 82% more likely to not show for appointments than privately insured women (p < 0.05). CONCLUSION: Changes to transportation availability alone may only modestly affect outcomes compared with strategically improving access for sociodemographically marginalized women.


Assuntos
Agendamento de Consultas , Cooperação do Paciente/estatística & dados numéricos , Cuidado Pré-Natal/estatística & dados numéricos , Viagem/estatística & dados numéricos , Adolescente , Adulto , Feminino , Humanos , Modelos Logísticos , North Carolina , Gravidez , Estudos Retrospectivos , Fatores de Tempo , Adulto Jovem
6.
Am J Obstet Gynecol ; 220(5): 440-448.e8, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30527945

RESUMO

OBJECTIVE DATA: Amenorrhea is a polarizing noncontraceptive effect of the levonorgestrel intrauterine system. Composite amenorrhea prevalence estimates that summarize all clinical data for the first-year after insertion currently are not available. The purpose of this study was to investigate the validity of existing prevalence estimates by the systematic calculation of amenorrhea measures for a general population of levonorgestrel intrauterine system users and to provide 90-day interval point estimates for the first year of use. STUDY: We identified clinical trials, randomized controlled trials, and randomized comparative trials that were published in English between January 1970 and September 2017 through electronic searches of 12 biomedical and scientific literature databases that included MEDLINE and ClinicalTrials.gov. STUDY APPRAISAL AND SYNTHESIS METHODS: We considered studies that clearly defined amenorrhea per World Health Organization standards (the complete cessation of bleeding for at least 90 days), collected data from written daily bleeding diaries (the gold standard data collection technique on menstrual bleeding changes), and evaluated levonorgestrel intrauterine system devices that released 20 µg of levonorgestrel per day. We assessed study quality using guidelines established by the US Preventive Services Task Force and Cochrane handbook for systematic reviews of interventions. Two reviewers independently conducted all review stages; disagreements were resolved by a third reviewer. Where possible, data were pooled with the use of a random-effects model. RESULTS: Of 2938 potentially relevant studies, we included 9 in our meta-analysis. We calculated amenorrhea prevalence, which was weighted for inter- and intrastudy variance, for 4 90-day intervals and months 0-12. Our results demonstrated few levonorgestrel intrauterine system users (0.2%; 95% confidence interval, 0.0-0.4) experienced amenorrhea during the first 90 days after insertion; however, prevalence increased to 8.1% (95% confidence interval, 6.6-9.7) on days 91-180. Finally, 18.2% (95% confidence interval, 14.9-21.5) of users experienced amenorrhea for at least 1 90-day interval during the first year. Although interstudy heterogeneity limited reliability of days 181-271 and 272-365 measures, prevalence increased from 13.6% (95% confidence interval, 9.3-18.0) to 20.3% (95% confidence interval, 13.5-27.0), respectively. CONCLUSION: Approximately 20% of levonorgestrel intrauterine system users experience amenorrhea during at least 1 90-day interval by the first year after insertion. This composite estimate is consistent with the product labeling and demonstrates that most users do not experience amenorrhea during the first year. These results provide accurate summary measures to facilitate counselling and informed method selection.


Assuntos
Amenorreia/etiologia , Contraceptivos Hormonais/uso terapêutico , Dispositivos Intrauterinos Medicados , Levanogestrel/uso terapêutico , Ensaios Clínicos como Assunto , Feminino , Humanos , Fatores de Tempo
7.
Clin Gerontol ; 42(3): 259-266, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-29206578

RESUMO

OBJECTIVE: To assess advance care planning (ACP) preferences, experiences, and comfort in discussing end-of-life (EOL) care among elderly Latinos. METHODS: Patients aged 60 and older from the Los Angeles County and University of Southern California (LAC+USC) Medical Center Geriatrics Clinic (n = 41) participated in this intervention. Trained staff conducted ACP counseling with participants in their preferred language, which included: (a) pre-counseling survey about demographics and EOL care attitudes, (b) discussion of ACP and optional completion of an advance directive (AD), and (c) post-session survey. RESULTS: Patients were primarily Spanish speaking with an average of 2.7 chronic medical conditions. Most had not previously documented (95%) or discussed (76%) EOL wishes. Most were unaware they had control over their EOL treatment (61%), but valued learning about EOL options (83%). Post-counseling, 85% reported comfort discussing EOL goals compared to 66% pre-session, and 88% elected to complete an AD. Nearly half of patients reported a desire to discuss EOL wishes sooner. CONCLUSIONS: Elderly Latino patients are interested in ACP, given individualized, culturally competent counseling in their preferred language. CLINICAL IMPLICATIONS: Patients should be offered the opportunity to discuss and document EOL wishes at all primary care appointments, regardless of health status. Counseling should be completed in the patient's preferred language, using culturally competent materials, and with family members present if this is the patient's preference. Cultural-competency training for providers could enhance the impact of EOL discussions and improve ACP completion rates for Latino patients.


Assuntos
Planejamento Antecipado de Cuidados/estatística & dados numéricos , Doença Crônica/psicologia , Hispânico ou Latino/psicologia , Assistência Terminal/psicologia , Diretivas Antecipadas , Idoso , Idoso de 80 Anos ou mais , California/epidemiologia , Estudos de Casos e Controles , Doença Crônica/epidemiologia , Doença Crônica/etnologia , Família , Feminino , Avaliação Geriátrica/métodos , Promoção da Saúde , Humanos , Masculino , Pessoa de Meia-Idade , Atenção Primária à Saúde/normas , Inquéritos e Questionários
8.
Endocrinol Metab Clin North Am ; 52(4): 629-641, 2023 12.
Artigo em Inglês | MEDLINE | ID: mdl-37865478

RESUMO

Racial and ethnic disparities exist in the prevalence and management of osteoporosis, metastatic cancer, and sickle cell disease. Despite being the most common metabolic bone disease, osteoporosis remains underscreened and undertreated among Black women. Skeletal-related events in metastatic cancer include bone pain, pathologic fractures, and spinal cord compression. Disparities in screening for and treating skeletal-related events disproportionately affect Black patients. Metabolic bone disease contributes significantly to morbidity in sickle cell disease; however, clinical guidelines for screening and treatment do not currently exist. Clinical care recommendations are provided to raise awareness, close health care gaps, and guide future research efforts.


Assuntos
Anemia Falciforme , Neoplasias , Osteoporose , Humanos , Feminino , Osteoporose/etiologia , Osteoporose/terapia , Osteoporose/diagnóstico , Atenção à Saúde , Anemia Falciforme/complicações , Anemia Falciforme/terapia
9.
Glob Health Sci Pract ; 9(4): 818-831, 2021 12 31.
Artigo em Inglês | MEDLINE | ID: mdl-34933978

RESUMO

BACKGROUND: Over 43% of children living in low- and middle-income countries are at risk for developmental delays; however, access to protective interventions in these settings is limited. We evaluated the effect of maternal participation in Chamas for Change (Chamas)-a community-based women's health education program during pregnancy and postpartum-and risk of developmental delay among their children in rural Kenya. METHODS: We analyzed developmental screening questionnaire (DSQ) data from a cluster randomized controlled trial in Trans Nzoia County, Kenya (ClinicalTrials.gov, NCT03187873). Intervention clusters (Chamas) participated in community health volunteer-led, group-based health lessons twice a month during pregnancy and postpartum; controls had monthly home visits (standard of care). We screened all children born during the trial who were alive at 1-year follow-up. We labeled children with any positive item on the DSQ as "at-risk development." We analyzed data using descriptive statistics and multilevel regression models (α=.05); analyses were intention-to-treat using individual-level data. RESULTS: Between November 2017 and March 2018, we enrolled 1,920 pregnant women to participate in the parent trial. At 1-year follow-up, we screened 1,273 (689 intervention, 584 control) children born during the trial with the DSQ. Intervention mothers had lower education levels and higher poverty likelihood scores than controls (P<.001 and P=.007, respectively). The overall rate of at-risk development was 3.5%. Children in Chamas clusters demonstrated significantly lower rates of at-risk development than controls (2.5% vs. 4.8%, P=.025). Adjusted analyses revealed lower odds for at-risk development in the intervention arm (OR=0.50; 95% confidence interval=0.27, 0.94). CONCLUSIONS: Maternal participation in a community-based women's health education program was associated with lower rates of at-risk development compared to the standard of care. Overall, rates of at-risk development were lower than expected for this population, warranting further investigation. Chamas may help protect children from developmental delay in rural Kenya and other resource-limited settings.


Assuntos
Desenvolvimento Infantil , Educação em Saúde , Criança , Feminino , Humanos , Quênia , Gravidez , População Rural , Inquéritos e Questionários
10.
BMJ Glob Health ; 5(12)2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33293295

RESUMO

INTRODUCTION: Community-based women's health education groups may improve maternal, newborn and child health (MNCH); however, evidence from sub-Saharan Africa is lacking. Chamas for Change (Chamas) is a community health volunteer (CHV)-led, group-based health education programme for pregnant and postpartum women in western Kenya. We evaluated Chamas' effect on facility-based deliveries and other MNCH outcomes. METHODS: We conducted a cluster randomised controlled trial involving 74 community health units in Trans Nzoia County. We included pregnant women who presented to health facilities for their first antenatal care visits by 32 weeks gestation. We randomised clusters 1:1 without stratification or matching; we masked data collectors, investigators and analysts to allocation. Intervention clusters were invited to bimonthly, group-based, CHV-led health lessons (Chamas); control clusters had monthly, individual CHV home visits (standard of care). The primary outcome was facility-based delivery at 12-month follow-up. We conducted an intention-to-treat approach with multilevel logistic regression models using individual-level data. RESULTS: Between 27 November 2017 and 8 March 2018, we enrolled 1920 participants from 37 intervention and 37 control clusters. A total of 1550 (80.7%) participants completed the study with 822 (82.5%) and 728 (78.8%) in the intervention and control arms, respectively. Facility-based deliveries improved in the intervention arm (80.9% vs 73.0%; risk difference (RD) 7.4%, 95% CI 3.0 to 12.5, OR=1.58, 95% CI 0.97 to 2.55, p=0.057). Chamas participants also demonstrated higher rates of 48 hours postpartum visits (RD 15.3%, 95% CI 12.0 to 19.6), exclusive breastfeeding (RD 11.9%, 95% CI 7.2 to 16.9), contraceptive adoption (RD 7.2%, 95% CI 2.6 to 12.9) and infant immunisation completion (RD 15.6%, 95% CI 11.5 to 20.9). CONCLUSION: Chamas participation was associated with significantly improved MNCH outcomes compared with the standard of care. This trial contributes robust data from sub-Saharan Africa to support community-based, women's health education groups for MNCH in resource-limited settings.Trial registration numberNCT03187873.


Assuntos
Saúde da Criança , Educação em Saúde , Saúde Materna , Avaliação de Resultados em Cuidados de Saúde , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Recém-Nascido , Quênia/epidemiologia , Gravidez
11.
Glob Health Sci Pract ; 7(2): 317-328, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-31189699

RESUMO

BACKGROUND: Observational studies raise concern about a potential link between injectable progestin contraceptive use and HIV acquisition risk. This possible link is particularly relevant in sub-Saharan Africa where HIV risk is high and the method mix is skewed toward injectables. We developed the Planning for Outcomes (P4O) model (https://planning4outcomes.ctiexchange.org/) to predict changes in maternal and child health (MCH) and HIV outcomes that could occur if the proportion of injectables in the method mix is changed. METHODS: P4O incorporates evidence-based assumptions to predict yearly changes in unintended pregnancies, morbidity/mortality, HIV infections (women and infants), and anticipated health care costs associated with changing the proportions of injectable users in 22 selected countries. Users of this model designate all countries or a subset and adjust inputs including percentage of injectable users who discontinue, percentage of discontinuers who begin use of an alternative method, hazard ratio for HIV infection with injectable use, method mix used by injectable discontinuers, annual probabilities of method-specific pregnancy and mother-to-child transmission of HIV, condom effectiveness against HIV, risk of HIV during pregnancy, and HIV incidence among women of reproductive age. RESULTS: Illustrative results from all sub-Saharan African countries combined and from selected countries demonstrate the potential of P4O to inform program planning and procurement decisions. In countries with high use of long-acting reversible contraception, the removal of injectables from the method mix is associated with improvement in MCH and HIV indicators if most injectable users switch to more effective methods (e.g., implants). In countries with high use of short-acting methods (e.g., condoms), the model predicts mostly negative MCH outcomes. CONCLUSIONS: Policy makers and program planners may use P4O to inform programming and policy decisions. In all scenarios, programmatic preparation to accommodate changes to the contraceptive method mix, considerations of how the individual desires of women will be addressed, and potential burden of anticipated MCH-related costs warrant advanced consideration.


Assuntos
Anticoncepção/efeitos adversos , Anticoncepcionais Femininos , Infecções por HIV/etiologia , Planejamento em Saúde , Saúde do Lactente , Saúde Materna , Progestinas , Adolescente , Adulto , África Subsaariana , Saúde da Criança , Preservativos , Anticoncepção/métodos , Comportamento Contraceptivo , Anticoncepcionais Femininos/administração & dosagem , Anticoncepcionais Femininos/efeitos adversos , Serviços de Planejamento Familiar/métodos , Feminino , Humanos , Lactente , Transmissão Vertical de Doenças Infecciosas , Masculino , Pessoa de Meia-Idade , Políticas , Gravidez , Complicações Infecciosas na Gravidez/etiologia , Progestinas/administração & dosagem , Progestinas/efeitos adversos , Adulto Jovem
12.
Exp Biol Med (Maywood) ; 243(2): 107-117, 2018 01.
Artigo em Inglês | MEDLINE | ID: mdl-29141455

RESUMO

Methionine adenosyltransferase genes encode enzymes responsible for the biosynthesis of S-adenosylmethionine, the principal biological methyl donor and precursor of polyamines and glutathione. Mammalian cells express three genes - MAT1A, MAT2A, and MAT2B - with distinct expression and functions. MAT1A is mainly expressed in the liver and maintains the differentiated states of both hepatocytes and bile duct epithelial cells. Conversely, MAT2A and MAT2B are widely distributed in non-parenchymal cells of the liver and extrahepatic tissues. Increasing evidence suggests that methionine adenosyltransferases play significant roles in the development of cancers. Liver cancers, namely hepatocellular carcinoma and cholangiocarcinoma, involve dysregulation of all three methionine adenosyltransferase genes. MAT1A reduction is associated with increased oxidative stress, progenitor cell expansion, genomic instability, and other mechanisms implicated in tumorigenesis. MAT2A/MAT2B induction confers growth and survival advantage to cancerous cells, enhancing tumor migration. Highlighted examples from colon, gastric, breast, pancreas and prostate cancer studies further underscore methionine adenosyltransferase genes' role beyond the liver in cancer development. In this subset of extra-hepatic cancers, MAT2A and MAT2B are induced via different regulatory mechanisms. Understanding the role of methionine adenosyltransferase genes in tumorigenesis helps identify attributes of these genes that may serve as valuable targets for therapy. While S-adenosylmethionine, and its metabolite, methylthioadenosine, have been largely explored as therapeutic interventions, targets aimed at regulation of MAT gene expression and methionine adenosyltransferase protein-protein interactions are now surfacing as potential effective strategies for treatment and chemoprevention of cancers. Impact statement This review examines the role of methionine adenosyltransferases (MATs) in human cancer development, with a particular focus on liver cancers in which all three MAT genes are implicated in tumorigenesis. An overview of MAT genes, isoenzymes and their regulation provide context for understanding consequences of dysregulation. Highlighting examples from liver, colon, gastric, breast, pancreas and prostate cancers underscore the importance of understanding MAT's tumorigenic role in identifying future targets for cancer therapy.


Assuntos
Metionina Adenosiltransferase/metabolismo , Neoplasias/tratamento farmacológico , Neoplasias/patologia , S-Adenosilmetionina/metabolismo , Animais , Modelos Animais de Doenças , Humanos
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