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https://www.readbyqxmd.com/read/27730229/the-organoarsenical-biocycle-and-the-primordial-antibiotic-methylarsenite
#1
REVIEW
Jiaojiao Li, Shashank S Pawitwar, Barry P Rosen
Arsenic is the most pervasive environmental toxic substance. As a consequence of its ubiquity, nearly every organism has genes for resistance to inorganic arsenic. In bacteria these genes are found largely in bacterial arsenic resistance (ars) operons. Recently a parallel pathway for synthesis and degradation of methylated arsenicals has been identified. The arsM gene product encodes the ArsM (AS3MT in animals) As(iii) S-adenosylmethionine methyltransferase that methylates inorganic trivalent arsenite in three sequential steps to methylarsenite MAs(iii), dimethylarsenite (DMAs(iii) and trimethylarsenite (TMAs(iii))...
October 1, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27225433/serum-caffeine-and-paraxanthine-concentrations-and-menstrual-cycle-function-correlations-with-beverage-intakes-and-associations-with-race-reproductive-hormones-and-anovulation-in-the-biocycle-study
#2
Karen C Schliep, Enrique F Schisterman, Jean Wactawski-Wende, Neil J Perkins, Rose G Radin, Shvetha M Zarek, Emily M Mitchell, Lindsey A Sjaarda, Sunni L Mumford
BACKGROUND: Clinicians often recommend limiting caffeine intake while attempting to conceive; however, few studies have evaluated the associations between caffeine exposure and menstrual cycle function, and we are aware of no previous studies assessing biological dose via well-timed serum measurements. OBJECTIVES: We assessed the relation between caffeine and its metabolites and reproductive hormones in a healthy premenopausal cohort and evaluated potential effect modification by race...
July 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/26954695/patterns-and-prevalence-of-medication-use-across-the-menstrual-cycle-among-healthy-reproductive-aged-women
#3
Kristen A Johnson, Lindsey A Sjaarda, Sunni L Mumford, Rebecca A Garbose, Karen C Schliep, Donald Mattison, Neil J Perkins, Jean Wactawski-Wende, Enrique F Schisterman
PURPOSE: The purpose of this study is to characterize the patterns of medication intake in healthy, reproductive-age women not using hormonal contraception. METHODS: Two hundered fifty-nine healthy, premenopausal women (18-44 years of age) enrolled in the BioCycle Study (2005-2007) were followed over two menstrual cycles. Women were excluded if they were currently using oral contraceptives or other chronic medications. Over-the-counter and prescription medication use among participants was evaluated daily throughout the study via a diary assessing type of medication, dosage, units, and frequency...
June 2016: Pharmacoepidemiology and Drug Safety
https://www.readbyqxmd.com/read/26843151/dietary-fat-intake-and-reproductive-hormone-concentrations-and-ovulation-in-regularly-menstruating-women
#4
Sunni L Mumford, Jorge E Chavarro, Cuilin Zhang, Neil J Perkins, Lindsey A Sjaarda, Anna Z Pollack, Karen C Schliep, Kara A Michels, Shvetha M Zarek, Torie C Plowden, Rose G Radin, Lynne C Messer, Robyn A Frankel, Jean Wactawski-Wende
BACKGROUND: Emerging evidence suggests potential links between some dietary fatty acids and improved fertility, because specific fatty acids may affect prostaglandin synthesis and steroidogenesis. OBJECTIVE: The objective of this exploratory study was to evaluate associations between total and specific types of dietary fat intake and 1) hormone concentrations and 2) the risk of sporadic anovulation in a cohort of 259 regularly menstruating women in the BioCycle Study...
March 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/26581679/serum-antioxidants-are-associated-with-serum-reproductive-hormones-and-ovulation-among-healthy-women
#5
Sunni L Mumford, Richard W Browne, Karen C Schliep, Jonathan Schmelzer, Torie C Plowden, Kara A Michels, Lindsey A Sjaarda, Shvetha M Zarek, Neil J Perkins, Lynne C Messer, Rose G Radin, Jean Wactawski-Wende, Enrique F Schisterman
BACKGROUND: Evidence is growing that the equilibrium between reactive oxygen species and antioxidants plays a vital role in women's reproductive health. OBJECTIVE: The objective of this study was to evaluate variations in serum antioxidant concentrations across the menstrual cycle and associations between antioxidants and reproductive hormones and anovulation among healthy women. METHODS: The BioCycle Study, a prospective cohort, followed 259 women aged 18-44 y for up to 2 menstrual cycles...
January 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/26082480/dietary-factors-and-luteal-phase-deficiency-in-healthy-eumenorrheic-women
#6
Mary A Andrews, Karen C Schliep, Jean Wactawski-Wende, Joseph B Stanford, Shvetha M Zarek, Rose G Radin, Lindsey A Sjaarda, Neil J Perkins, Robyn A Kalwerisky, Ahmad O Hammoud, Sunni L Mumford
STUDY QUESTION: Are prospectively assessed dietary factors, including overall diet quality, macronutrients and micronutrients, associated with luteal phase deficiency (LPD) in healthy reproductive aged women with regular menstrual cycles? SUMMARY ANSWER: Mediterranean Diet Score (MDS), fiber and isoflavone intake were positively associated with LPD while selenium was negatively associated with LPD after adjusting for age, percentage body fat and total energy intake...
August 2015: Human Reproduction
https://www.readbyqxmd.com/read/26044439/draft-genome-sequence-of-burkholderia-sp-mr1-a-methylarsenate-reducing-bacterial-isolate-from-florida-golf-course-soil
#7
Shashank S Pawitwar, Sagar M Utturkar, Steven D Brown, Masafumi Yoshinaga, Barry P Rosen
To elucidate the environmental organoarsenical biocycle, we isolated a soil organism, Burkholderia sp. MR1, which reduces relatively nontoxic pentavalent methylarsenate to the more toxic trivalent methylarsenite, with the goal of identifying the gene for the reductase. Here, we report the draft genome sequence of Burkholderia sp. MR1.
2015: Genome Announcements
https://www.readbyqxmd.com/read/26043860/changes-in-macronutrient-micronutrient-and-food-group-intakes-throughout-the-menstrual-cycle-in-healthy-premenopausal-women
#8
Anna M Gorczyca, Lindsey A Sjaarda, Emily M Mitchell, Neil J Perkins, Karen C Schliep, Jean Wactawski-Wende, Sunni L Mumford
PURPOSE: It is thought that total energy intake in women is increased during the luteal versus follicular phase of the menstrual cycle; however, less is understood regarding changes in diet composition (i.e., macro- and micronutrient intakes) across the cycle. The aim of this study was to investigate changes in macronutrient, micronutrient, and food group intakes across phases of the menstrual cycle among healthy women, and to assess whether these patterns differ by ovulatory status. METHODS: The BioCycle study (2005-2007) was a prospective cohort study of 259 healthy regularly menstruating women age 18-44 who were followed for up to two menstrual cycles...
April 2016: European Journal of Nutrition
https://www.readbyqxmd.com/read/25954035/effects-of-over-the-counter-analgesic-use-on-reproductive-hormones-and-ovulation-in-healthy-premenopausal-women
#9
R A Matyas, S L Mumford, K C Schliep, K A Ahrens, L A Sjaarda, N J Perkins, A C Filiberto, D Mattison, S M Zarek, J Wactawski-Wende, E F Schisterman
STUDY QUESTION: Does use of commonly used over-the-counter (OTC) pain medication affect reproductive hormones and ovulatory function in premenopausal women? SUMMARY ANSWER: Few associations were found between analgesic medication use and reproductive hormones, but use during the follicular phase was associated with decreased odds of sporadic anovulation after adjusting for potential confounders. WHAT IS KNOWN ALREADY: Analgesic medications are the most commonly used OTC drugs among women, but their potential effects on reproductive function are unclear...
July 2015: Human Reproduction
https://www.readbyqxmd.com/read/25220822/a-highly-efficient-design-strategy-for-regression-with-outcome-pooling
#10
Emily M Mitchell, Robert H Lyles, Amita K Manatunga, Neil J Perkins, Enrique F Schisterman
The potential for research involving biospecimens can be hindered by the prohibitive cost of performing laboratory assays on individual samples. To mitigate this cost, strategies such as randomly selecting a portion of specimens for analysis or randomly pooling specimens prior to performing laboratory assays may be employed. These techniques, while effective in reducing cost, are often accompanied by a considerable loss of statistical efficiency. We propose a novel pooling strategy based on the k-means clustering algorithm to reduce laboratory costs while maintaining a high level of statistical efficiency when predictor variables are measured on all subjects, but the outcome of interest is assessed in pools...
December 10, 2014: Statistics in Medicine
https://www.readbyqxmd.com/read/24954690/sexual-activity-endogenous-reproductive-hormones-and-ovulation-in-premenopausal-women
#11
Ankita Prasad, Sunni L Mumford, Germaine M Buck Louis, Katherine A Ahrens, Lindsey A Sjaarda, Karen C Schliep, Neil J Perkins, Kerri A Kissell, Jean Wactawski-Wende, Enrique F Schisterman
We investigated whether sexual activity was associated with reproductive function in the BioCycle Study, a prospective cohort study that followed 259 regularly menstruating women aged 18 to 44years for one (n=9) or two (n=250) menstrual cycles in 2005-2007. Women were not attempting pregnancy nor using hormonal contraceptives. History of ever having been sexually active was assessed at baseline and frequency of sexual activity, defined as vaginal-penile intercourse, was self-reported daily throughout the study...
July 2014: Hormones and Behavior
https://www.readbyqxmd.com/read/24345590/the-effect-of-physical-activity-across-the-menstrual-cycle-on-reproductive-function
#12
Katherine A Ahrens, Catherine J Vladutiu, Sunni L Mumford, Karen C Schliep, Neil J Perkins, Jean Wactawski-Wende, Enrique F Schisterman
PURPOSE: To evaluate the association between physical activity (PA) across the menstrual cycle and reproductive function. METHODS: The BioCycle Study (2005-2007) followed 259 healthy premenopausal women not using hormonal contraceptives for up to two menstrual cycles (N = 509 cycles). Serum leptin, estradiol, progesterone, luteinizing hormone, follicle-stimulating hormone, and testosterone were measured five to eight times per cycle. Linear mixed models were used to estimate the effect of past-week PA (measured four times during each cycle) on hormone levels...
February 2014: Annals of Epidemiology
https://www.readbyqxmd.com/read/24215851/serum-leptin-levels-and-reproductive-function-during-the-menstrual-cycle
#13
Katherine Ahrens, Sunni L Mumford, Karen C Schliep, Kerri A Kissell, Neil J Perkins, Jean Wactawski-Wende, Enrique F Schisterman
OBJECTIVE: The purpose of this study was to investigate the role of leptin on reproductive hormones and ovulation. STUDY DESIGN: The BioCycle Study (2005-2007) followed 259 healthy premenopausal women not using hormonal contraceptives for ≤2 menstrual cycles (n = 509 cycles). Serum leptin, estradiol, progesterone, luteinizing hormone (LH), follicle-stimulating hormone, and testosterone were measured ≤8 times per cycle. The association of time-varying leptin and reproductive hormones over the cycle was estimated with the use of linear mixed models that were adjusted for percent body fat and age with inverse probability weighting for time-varying physical activity, caloric intake, and other reproductive hormones...
March 2014: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/23936766/serum-retinol-and-carotenoids-in-association-with-biomarkers-of-insulin-resistance-among-premenopausal-women
#14
Stacy A Blondin, Edwina H Yeung, Sunni L Mumford, Cuilin Zhang, Richard W Browne, Jean Wactawski-Wende, Enrique F Schisterman
OBJECTIVE: The aim of this study was to investigate how serum retinol and carotenoids (β-carotene, β-cryptoxanthin, lutein/zeaxanthin, lycopene) are associated with biomarkers of insulin resistance. RESEARCH METHODS AND PROCEDURES: The BioCycle Study (2005-2007) is a prospective cohort of 259 healthy premenopausal women. Fasting serum samples were collected at up to sixteen clinic visits, from which retinol, carotenoids, insulin, glucose, and sex hormone-binding globulin (SHBG) were measured...
January 1, 2013: ISRN Nutrition
https://www.readbyqxmd.com/read/23616515/habitual-dietary-isoflavone-intake-is-associated-with-decreased-c-reactive-protein-concentrations-among-healthy-premenopausal-women
#15
Amanda C Filiberto, Sunni L Mumford, Anna Z Pollack, Cuilin Zhang, Edwina H Yeung, Neil J Perkins, Jean Wactawski-Wende, Enrique F Schisterman
Isoflavones have been associated with lower cardiovascular disease risk, but existing research focused on very high isoflavone intakes, as seen in Asian populations, as well as on risk factor reductions primarily in postmenopausal women. We investigated whether habitual low isoflavone intake among premenopausal women was associated with serum C-reactive protein (CRP) concentration, a commonly used biomarker associated with prediction of cardiovascular disease risk in healthy women. Between 2005 and 2007, 259 healthy, regularly menstruating women were enrolled in the BioCycle Study, and followed for up to 2 menstrual cycles...
June 2013: Journal of Nutrition
https://www.readbyqxmd.com/read/23589536/the-influence-of-sporadic-anovulation-on-hormone-levels-in-ovulatory-cycles
#16
H L Hambridge, S L Mumford, D R Mattison, A Ye, A Z Pollack, M S Bloom, P Mendola, K L Lynch, J Wactawski-Wende, E F Schisterman
STUDY QUESTION: Do ovulatory hormone profiles among healthy premenopausal women differ between women with and without sporadic anovulation? SUMMARY ANSWER: Women with one anovulatory cycle tended to have lower estradiol, progesterone and LH peak levels during their ovulatory cycle. WHAT IS KNOWN ALREADY: Anovulation occurs sporadically in healthy premenopausal women, but the influence of hormones in a preceding cycle and the impact on a subsequent cycle's hormone levels is unknown...
June 2013: Human Reproduction
https://www.readbyqxmd.com/read/23562957/serum-uric-acid-in-relation-to-endogenous-reproductive-hormones-during-the-menstrual-cycle-findings-from-the-biocycle-study
#17
Sunni L Mumford, Sonya S Dasharathy, Anna Z Pollack, Neil J Perkins, Donald R Mattison, Stephen R Cole, Jean Wactawski-Wende, Enrique F Schisterman
STUDY QUESTION: Do uric acid levels across the menstrual cycle show associations with endogenous estradiol (E2) and reproductive hormone concentrations in regularly menstruating women? SUMMARY ANSWER: Mean uric acid concentrations were highest during the follicular phase, and were inversely associated with E2 and progesterone, and positively associated with FSH. WHAT IS KNOWN ALREADY: E2 may decrease serum levels of uric acid in post-menopausal women; however, the interplay between endogenous reproductive hormones and uric acid levels among regularly menstruating women has not been elucidated...
July 2013: Human Reproduction
https://www.readbyqxmd.com/read/23462965/validation-of-different-instruments-for-caffeine-measurement-among-premenopausal-women-in-the-biocycle-study
#18
Karen C Schliep, Enrique F Schisterman, Sunni L Mumford, Neil J Perkins, Aijun Ye, Anna Z Pollack, Cuilin Zhang, Christina A Porucznik, James A VanDerslice, Joseph B Stanford, Jean Wactawski-Wende
Effects of caffeine on women's health are inconclusive, in part because of inadequate exposure assessment. In this study we determined 1) validity of a food frequency questionnaire compared with multiple 24-hour dietary recalls (24HDRs) for measuring monthly caffeine and caffeinated beverage intakes; and 2) validity of the 24HDR compared with the prior day's diary record for measuring daily caffeinated coffee intake. BioCycle Study (2005-2007) participants, women (n = 259) aged 18-44 years from western New York State, were followed for 2 menstrual cycles...
April 1, 2013: American Journal of Epidemiology
https://www.readbyqxmd.com/read/23388669/adherence-to-the-mediterranean-diet-and-body-fat-distribution-in-reproductive-aged-women
#19
N S Boghossian, E H Yeung, S L Mumford, C Zhang, A J Gaskins, J Wactawski-Wende, E F Schisterman
BACKGROUND/OBJECTIVES: Adherence to the Mediterranean diet (MD), high in fruits, vegetables and monounsaturated fats, has been associated with lower body mass index. Associations with measured body fat, including regional adiposity, have not been previously investigated. We examined the associations between the alternate Mediterranean diet score (aMED), anthropometry and measured adiposity by dual-energy x-ray absorptiometry (DXA). SUBJECTS/METHODS: This study included 248 healthy females, aged 18-44 years from the BioCycle Study...
March 2013: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/23364018/energy-containing-beverages-reproductive-hormones-and-ovarian-function-in-the-biocycle-study
#20
Karen C Schliep, Enrique F Schisterman, Sunni L Mumford, Anna Z Pollack, Neil J Perkins, Aijun Ye, Cuilin J Zhang, Joseph B Stanford, Christina A Porucznik, Ahmad O Hammoud, Jean Wactawski-Wende
BACKGROUND: Energy-containing beverages are widely consumed among premenopausal women, but their association with reproductive hormones is not well understood. OBJECTIVE: The objective was to assess the association of energy-containing beverages, added sugars, and total fructose intake with reproductive hormones among ovulatory cycles and sporadic anovulation in healthy premenopausal women. DESIGN: Women (n = 259) in the BioCycle Study were followed for up to 2 menstrual cycles; they provided fasting blood specimens during up to 8 visits/cycle and four 24-h dietary recalls/cycle...
March 2013: American Journal of Clinical Nutrition
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