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Dale Barnhart, Ellen Hertzmark, Enju Liu, Ester Mungure, Aisa N Muya, David Sando, Guerino Chalamilla, Nzovu Ulenga, Till Bärnighausen, Wafaie Fawzi, Donna Spiegelman
INTRODUCTION: Researchers planning cluster-randomized controlled trials (cRCTs) require estimates of the intra-cluster correlation coefficient (ICC) from previous studies for sample size calculations. This paper fills a persistent gap in the literature by providing estimates of ICCs for many key HIV-related clinical outcomes. METHODS: Data from HIV-positive patients from 47 HIV care and treatment clinics in Dar es Salaam, Tanzania were used to calculate ICCs by site of enrollment or site of ART initiation for various clinical outcomes using cross-sectional and longitudinal data...
December 15, 2016: Contemporary Clinical Trials Communications
Sirui Zhou, Amirthagowri Ambalavanan, Daniel Rochefort, Pingxing Xie, Cynthia V Bourassa, Pascale Hince, Alexandre Dionne-Laporte, Dan Spiegelman, Ziv Gan-Or, Cathy Mirarchi, Vessela Zaharieva, Nicolas Dupré, Hatasu Kobayashi, Toshiaki Hitomi, Kouji Harada, Akio Koizumi, Lan Xiong, Patrick A Dion, Guy A Rouleau
Intracranial aneurysms (IAs) are the result of focal weakness in the artery wall and have a complex genetic makeup. To date, genome-wide association and sequencing studies have had limited success in identifying IA risk factors. Distinct populations, such as the French-Canadian (FC) population, have increased IA prevalence. In our study, we used exome sequencing to prioritize risk variants in a discovery cohort of six FC families affected by IA, and the analysis revealed an increased variation burden for ring finger protein 213 (RNF213)...
September 30, 2016: American Journal of Human Genetics
Leslie V Farland, Rulla M Tamimi, A Heather Eliassen, Donna Spiegelman, Susan E Hankinson, Wendy Y Chen, Stacey A Missmer
OBJECTIVE: To investigate the association between laparoscopically confirmed endometriosis and the risk of breast cancer. Previous research on endometriosis and breast cancer has reported mixed results. METHODS: Our prospective cohort study included 116,430 women from the Nurses' Health Study II cohort followed from 1989 until 2013. Our primary analysis investigated the association between self-reported laparoscopically confirmed endometriosis and the risk of breast cancer...
October 6, 2016: Obstetrics and Gynecology
Brittany M Charlton, Heather L Corliss, Donna Spiegelman, Kerry Williams, S Bryn Austin
OBJECTIVES: To compare changes in self-reported sexual orientation of women living in states with any recognition of same-sex relationships (e.g., hospital visitation, domestic partnerships) with those of women living in states without such recognition. METHODS: We calculated the likelihood of women in the Nurses' Health Study II (n = 69 790) changing their reported sexual orientation between 1995 and 2009. RESULTS: We used data from the Nurses' Health Study II and found that living in a state with same-sex relationship recognition was associated with changing one's reported sexual orientation, particularly from heterosexual to sexual minority...
October 13, 2016: American Journal of Public Health
Luiz F L Oliveira, Nathalie Tarrat, Jérôme Cuny, Joseph Morillo, Didier Lemoine, Fernand Spiegelman, Mathias Rapacioli
We benchmark existing and improved self-consistent-charge density functional based tight-binding (SCC-DFTB) parameters for silver and gold clusters as well as for bulk materials. In the former case, our benchmarks focus on both the structural and energetic properties of small-size AgN and AuN clusters (N from 2 to 13), medium-size clusters with N = 20 and 55, and finally larger nanoparticles with N = 147, 309, and 561. For bulk materials, structural, energetics and elastic properties are discussed. We show that SCC-DFTB is quite satisfactory in reproducing essential differences between silver and gold aggregates, in particular their 2D-3D structural transitions, and their dependency upon cluster charge...
October 13, 2016: Journal of Physical Chemistry. A
Pili Kamenju, Enju Liu, Ellen Hertzmark, Donna Spiegelman, Rodrick Kisenge, Roland Kupka, Said Aboud, Karim P Manji, Christopher Duggan, Wafaie W Fawzi
Complementary feeding is crucial for improving child survival and promoting growth and development, particularly among HIV-exposed children who have higher risk of morbidity and mortality than their un-exposed peers. This prospective study employed an infant and child feeding index (ICFI) to measure complementary feeding and determine its association with nutritional status among 2092 HIV-exposed infants followed from 6 to 24 months of age in Dar es Salaam, Tanzania. The ICFI measured both quality and quantity of complementary feeding, including current breastfeeding status, food consistency, dietary diversity scores (DDS), food group frequency score, and meal frequency...
September 30, 2016: Maternal & Child Nutrition
Amir Sharafkhaneh, Andrew M Spiegelman, Kevin Main, Shahriar Tavakoli-Tabasi, Charlie Lan, Daniel Musher
It is unclear whether concurrent pneumonia and chronic obstructive pulmonary disease (COPD) have a higher mortality than either condition alone. Further, it is unknown how this interaction changes over time. We explored the effect of pneumonia and COPD on inpatient, 30-day and overall mortality. We used a Veterans Health Affairs database to compare patients who were hospitalized for a COPD exacerbation without pneumonia (AECOPD), patients hospitalized for pneumonia without COPD (PNA) and patients hospitalized for pneumonia who had a concurrent diagnosis of COPD (PCOPD)...
September 23, 2016: COPD
Rachel M Zack, Kahema Irema, Patrick Kazonda, Germana H Leyna, Enju Liu, Donna Spiegelman, Wafaie Fawzi, Marina Njelekela, Japhet Killewo, Goodarz Danaei
OBJECTIVES: We assessed the prevalence and determinants of high blood pressure (BP), and barriers to diagnosis and treatment, in Dar es Salaam, Tanzania. METHODS: We surveyed and screened 2174 community-dwelling adults aged at least 40 years in 2014 and conducted a follow-up after 1 year. RESULTS: Median BP was 131/81 mmHg, and hypertension prevalence was 37%. Mean adjusted difference in SBP was 4.0 mmHg for overweight, 6.3 mmHg for obese class I, and 10...
September 17, 2016: Journal of Hypertension
Leslie V Farland, Rulla M Tamimi, A Heather Eliassen, Donna Spiegelman, Laura C Collins, Stuart J Schnitt, Stacey A Missmer
PURPOSE: Given the altered hormonal and inflammatory environment of women with endometriosis, several studies have suggested a positive association between endometriosis and breast cancer, although findings have been mixed. This study investigates the relationship between endometriosis and benign breast disease (BBD), benign lesions that are associated with an increased risk of breast cancer. METHODS: Among women in the Nurses' Health Study II followed from 1991-2003 (n = 76,393), we investigated the association between laparoscopically confirmed endometriosis and biopsy-confirmed BBD...
October 2016: Breast Cancer Research and Treatment
Lykke Sylow, Jonathan Long, Isha A Lokurkar, Xing Zeng, Erik A Richter, Bruce M Spiegelman
Dasatinib (Sprycel) is a tyrosine kinase inhibitor approved for treatment of chronic myeloid leukemia (CML). In this study we identify dasatinib as a potent inducer of PGC-1α mRNA. Dasatinib increased PGC-1α mRNA expression up to 6-fold in 3T3-F442A adipocytes, primary adipocytes, and epididymal white adipose tissue from lean and diet-induced obese (DIO) mice. Importantly, gene expression translated into increased PGC-1α protein content analyzed in melanoma cells and isolated mitochondria from adipocytes...
September 2, 2016: Endocrinology
Xing Zeng, Mark P Jedrychowski, Yi Chen, Sara Serag, Gareth G Lavery, Steve P Gygi, Bruce M Spiegelman
Brown adipocytes display phenotypic plasticity, as they can switch between the active states of fatty acid oxidation and energy dissipation versus a more dormant state. Cold exposure or β-adrenergic stimulation favors the active thermogenic state, whereas sympathetic denervation or glucocorticoid administration promotes more lipid accumulation. Our understanding of the molecular mechanisms underlying these switches is incomplete. Here we found that LSD1 (lysine-specific demethylase 1), a histone demethylase, regulates brown adipocyte metabolism in two ways...
August 15, 2016: Genes & Development
Jonah Bardos, Jenna Friedenthal, Jessica Spiegelman, Zev Williams
BACKGROUND: There are many challenges in conducting surveys of study participants, including cost, time, and ability to obtain quality and reproducible work. Cloudsourcing (an arrangement where a cloud provider is paid to carry out services that could be provided in-house) has the potential to provide vastly larger, less expensive, and more generalizable survey pools. OBJECTIVE: The objective of this study is to evaluate, using Amazon's Mechanical Turk (MTurk), a cloud-based workforce to assess patients' perspectives of health care...
2016: JMIR Research Protocols
Leslie V Farland, Rulla M Tamimi, A Heather Eliassen, Donna Spiegelman, Kimberly A Bertrand, Stacey A Missmer
PURPOSE: Endometriosis and mammographic density have been hypothesized to be influenced by sex steroid hormonal exposures in adolescence and early adulthood. We investigated the association between endometriosis and mammographic density, a consistent and independent risk factor for breast cancer. METHODS: We conducted a cross-sectional analysis among 1,581 pre- and postmenopausal women not previously diagnosed with breast cancer in the Nurses' Health Study II cohort...
October 2016: Cancer Causes & Control: CCC
David Sando, Hannah Ratcliffe, Kathleen McDonald, Donna Spiegelman, Goodluck Lyatuu, Mary Mwanyika-Sando, Faida Emil, Mary Nell Wegner, Guerino Chalamilla, Ana Langer
BACKGROUND: In many countries, rates of facility-based childbirth have increased substantially in recent years. However, insufficient attention has been paid to the acceptability and quality of maternal health services provided at facilities and, consequently, maternal health outcomes have not improved as expected. Disrespect and abuse during childbirth is increasingly being recognized as an indicator of overall poor quality of care and as a key barrier to achieving improved maternal health outcomes, but little evidence exists to describe the scope and magnitude of this problem, particularly in urban areas in low-income countries...
2016: BMC Pregnancy and Childbirth
Paul Cohen, Bruce M Spiegelman
The worldwide epidemic of obesity and type 2 diabetes has greatly increased interest in the biology and physiology of adipose tissues. Adipose (fat) cells are specialized for the storage of energy in the form of triglycerides, but research in the last few decades has shown that fat cells also play a critical role in sensing and responding to changes in systemic energy balance. White fat cells secrete important hormone-like molecules such as leptin, adiponectin, and adipsin to influence processes such as food intake, insulin sensitivity, and insulin secretion...
August 15, 2016: Molecular Biology of the Cell
Donna Spiegelman
The Nurses' Health Study and many other large longitudinal cohorts around the world use the food frequency questionnaire to assess dietary intake over time, and to relate diet to health. Controversies concerning this questionnaire's ability to adequately measure diet have led to a flurry of methods for evaluating the magnitude of measurement error and misclassification in exposure assessment, and for correcting the point and interval estimates of effect on the basis of these assessment methods for this error...
September 2016: American Journal of Public Health
Frank B Hu, Ambika Satija, Eric B Rimm, Donna Spiegelman, Laura Sampson, Bernard Rosner, Carlos A Camargo, Meir Stampfer, Walter C Willett
OBJECTIVES: To review the contribution of the Nurses' Health Studies (NHSs) to diet assessment methods and evidence-based nutritional policies and guidelines. METHODS: We performed a narrative review of the publications of the NHS and NHS II between 1976 and 2016. RESULTS: Through periodic assessment of diet by validated dietary questionnaires over 40 years, the NHSs have identified dietary determinants of diseases such as breast and other cancers; obesity; type 2 diabetes; cardiovascular, respiratory, and eye diseases; and neurodegenerative and mental health disorders...
September 2016: American Journal of Public Health
Pornpun Aramsangtienchai, Nicole A Spiegelman, Bin He, Seth P Miller, Lunzhi Dai, Yingming Zhao, Hening Lin
The histone deacetylase (HDAC) family regulates many biological pathways through the deacetylation of lysine residues on histone and nonhistone proteins. Mammals have 18 HDACs that are classified into four classes. Class I, II, and IV are zinc-dependent, while class III is nicotinamide adenine dinucleotide (NAD(+))-dependent lysine deacetylase or sirtuins. HDAC8, a class I HDAC family member, has been shown to have low deacetylation activity compared to other HDACs in vitro. Recent studies showed that several sirtuins, with low deacetylase activities, can actually hydrolyze other acyl lysine modifications more efficiently...
October 21, 2016: ACS Chemical Biology
Jessica Spiegelman, Whitney Booker, Simi Gupta, Jennifer Lam-Rochlin, Andrei Rebarber, Daniel H Saltzman, Ana Monteagudo, Nathan S Fox
Objective To estimate the independent association of a short cervical length (CL), positive fetal fibronectin (fFN), amniotic fluid (AF) sludge, and cervical funneling with spontaneous preterm birth in twin pregnancies. Methods Retrospective cohort study of twin pregnancies managed by a single maternal-fetal medicine practice from June 2005 to February 2014. All patients underwent transvaginal sonographic CL and fFN testing. We reviewed all images from the first CL at 22(0/7) to 25(6/7) weeks for the presence of (1) a short CL, which is defined as ≤25 mm, (2) AF sludge, and (3) cervical funneling, and also recorded (4) the fFN result from that time...
October 2016: American Journal of Perinatology
Vassilios J Bezzerides, Colin Platt, Carolin Lerchenmüller, Kaavya Paruchuri, Nul Loren Oh, Chunyang Xiao, Yunshan Cao, Nina Mann, Bruce M Spiegelman, Anthony Rosenzweig
The mechanisms by which exercise mediates its multiple cardiac benefits are only partly understood. Prior comprehensive analyses of the cardiac transcriptional components and microRNAs dynamically regulated by exercise suggest that the CBP/p300-interacting protein CITED4 is a downstream effector in both networks. While CITED4 has documented functional consequences in neonatal cardiomyocytes in vitro, nothing is known about its effects in the adult heart. To investigate the impact of cardiac CITED4 expression in adult animals, we generated transgenic mice with regulated, cardiomyocyte-specific CITED4 expression...
June 16, 2016: JCI Insight
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