Angela Devlin


Research Interests

cardiovascular disease
developmental programming

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Graduate Student Supervision

Doctoral Student Supervision

Dissertations completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest dissertations.

Maternal exercise mitigates the adverse effects of obesity on adult offspring cardiometabolic health (2020)

Background: Maternal obesity during pregnancy is associated with insulin resistance and vascular endothelial dysfunction (an early indicator of vascular damage) in offspring. However, it is unclear whether maternal exercise can mitigate the adverse effects of maternal obesity. My thesis research tested the hypothesis that maternal exercise during pregnancy and lactation will mitigate the adverse effects of maternal obesity on offspring health. Methods: Female (C57BL/6N) mice (dams) were fed a control diet (control dams; 10% kcal fat) or a western diet (obese dams; 45% kcal fat) from weaning for 13 weeks to induce excess adiposity and glucose intolerance prior to pregnancy. Dams were bred at age 16 weeks to age-matched males C57BL/6N mice fed the control diet. One week prior to breeding, the female mice were provided with a running wheel in the cage (voluntary exercise) or no wheel. Two groups of male offspring were studied: i) age postnatal day 7 (P7); and ii) adults weaned on to the control or western diet and fed for 14 weeks.Results: Adult offspring from obese dams that exercised had improved vascular endothelial-dependent function, but this was only observed in the offspring fed the western diet. This was accompanied by alterations in aorta and liver one-carbon metabolism. At P7, male pups from exercised dams had improved  cell function compared to pups from sedentary dams. In the adult offspring, exercise improved glucose tolerance in offspring fed the western diet that were from obese dams. Unexpectedly, maternal exercise increased adiposity in adult offspring fed the control diet that were from obese dams but no differences in glucose homeostasis were observed. The alterations in adiposity by maternal exercise were accompanied by differential DNA methylation in adipocytes. In the dams, exercise improved insulin sensitivity and altered aorta and liver one-carbon metabolism, suggesting that the phenotype observed in the offspring may be due to obesity and exercised-induced changes in one-carbon metabolism in the dams.Conclusion: My findings demonstrate that maternal exercise prevented vascular dysfunction, improved glucose homeostasis, and altered adiposity in the male offspring and involves tissue-specific alterations in one-carbon metabolism and DNA methylation.

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Riboflavin: intake, status, and relation to anemia among women of reproductive age (2020)

Riboflavin is a B-vitamin that is essential for redox reactions. Erythrocyte glutathionereductase activity coefficient (EGRac) is a biomarker of riboflavin status; ratios ≥1.40 arecommonly interpreted as indicating biochemical deficiency. Biochemical riboflavin deficiencymay contribute to anemia; however, little is known about the riboflavin status and relationship toanemia in reproductive-aged women. The objective of my thesis was to determine riboflavinstatus and relationship with anemia in women of reproductive age in Canada, Malaysia, andCambodia.The first study determined riboflavin status and its association with hemoglobin andanemia in women (19-45y) living in Canada (n=206) and Malaysia (n=210). Riboflavindeficiency (EGRac ≥1.40) was more prevalent in Malaysian than Canadian women (71% vs.40%). A negative association between EGRac and hemoglobin (r= -0.18; P
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Methyl Metabolism in Obesity-Related Cardiac Remodeling (2016)

Cardiovascular disease (CVD) is the second leading cause of death in Canada. Obesity is a well-established risk factor for CVD and its prevalence has increased dramatically across the globe during recent decades. In the setting of obesity, excess lipid accumulation in the heart leads to changes in cardiac function and metabolism of CVD. The molecular mechanisms contributing to these obesity-related CVDs are not well understood, and may involve DNA methylation. Methylation of DNA is a post-replication modification that provides ‘marks’ in the genome, such that genes are set to be transcriptionally activated or silenced. DNA methyltransferases are responsible for the methylation of DNA and use S-adenosylmethionine (AdoMet) as the methyl donor. The metabolism of methyl groups and the production of AdoMet involve three interrelated pathways: folate cycle, methionine cycle, and transsulfuration pathway. As such, disturbances in methyl metabolism could change DNA methylation patterns in the heart and be involved in the pathogenesis of CVD. The objective of this thesis was to test the general hypothesis that disturbances in methyl metabolism contributes to obesity-related cardiovascular pathology. C57BL/6J mice with (+/-) and without (+/+) a heterozygous targeted disruption of the gene for cystathionine-beta-synthase (CBS), an enzyme required for the transsulfuration pathway, were used to disrupt methyl metabolism. At weaning, mice were fed either a control diet or a high-fat diet (HFD, 60% energy from fat) to induce excess adiposity (obesity). Studies in the thesis revealed three major findings. First, disturbances in methyl metabolism enhanced cardiac lipotoxicity associated with diet-induced obesity. Second,disturbances in methyl metabolism altered cardiac energy metabolism and function associated with obesity-related cardiac remodeling. Third, disturbances in methyl metabolism contributed to a tissue-specific relationship between ‘methylation capacity’ (AdoMet/AdoHcy ratio), DNA methylation, and gene expression in Cbs +/- mice. In summary, these data revealed a unique role for CBS in cardiac fatty acid metabolism, possibly contributing to the pathology of obesity-related cardiac remodeling. These findings also provide first time evidence of disturbances in methyl metabolism and the functional consequences as it pertains to DNA methylation, regulation of gene expression, and cardiac remodeling in mice with diet-induced obesity.

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Master's Student Supervision

Theses completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest theses.

Gestational obesity/prediabetes and folic acid supplementation program fetal one-carbon metabolism and beta cell mass (2021)

Background: Folic acid supplementation is recommended for women of childbearing age to prevent birth defects. Women with pregestational obesity (BMI≥30kg/m²) and/or diabetes are recommended to take up to 12x the recommended dose of folic acid. Concerns have been raised that elevated folic acid during pregnancy may have negative impacts on the cardiometabolic health of the mother and child. The objective of my thesis was to determine the effects of folic acid supplementation in gestational obesity/prediabetes on maternal and fetal health. Methods: Female (C57BL/6J) mice were fed from weaning a control diet (10% kcal fat; control dams) or western diet (45% kcal fat; western dams; model of obesity/prediabetes). Diets contained supplemental (10mg/kg diet) or recommended level (2mg/kg diet) folic acid. Dams (n=11-14/diet) were fed for 13 weeks prior to breeding with control males. Tissue from dams and fetal offspring were collected at embryonic day (E)18.5. Results: Prior to breeding, western dams had greater body weight and adiposity accompanied by glucose intolerance and impaired β cell function. Folic acid supplementation reduced insulin sensitivity in control dams and improved insulin sensitivity in western dams. At E18.5, western dams had larger livers and key methyl donor, S-adenosylmethionine (SAM), and it’s demethylated product, S-adenosylhomocysteine (SAH), were lower in liver, compared to control dams. Male offspring from western dams had smaller livers and higher hepatic betaine and choline compared to offspring from control dams. Female offspring from western dams had smaller livers and higher hepatic betaine compared to those from control dams. Maternal folic acid supplementation increased hepatic SAM in female offspring, but not in male offspring. Maternal diet did not affect fetal pancreas size, but male offspring from folic acid supplemented dams had greater β cell mass and β cell density compared to those from non-supplemented dams; no effect of maternal diet on β cell mass was observed in female offspring. Conclusion: Folic acid supplementation does not exacerbate adiposity and glucose tolerance in dams with gestational obesity/prediabetes. However, maternal folic acid supplementation and gestational obesity/prediabetes has sex-specific effects on hepatic one-carbon metabolism and pancreatic β cell mass in fetal offspring.

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Long-term metabolic effects of repeated neonatal oral sucrose treatment in mice (2020)

Background: Preterm infants (
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Programming of adiposity in female offspring by maternal obesity and exercise (2018)

INTRODUCTION: In Canada, nearly half of women of child-bearing age are overweight (BMI 25-29.9 kg/m²) or obese (BMI ≥30 kg/m²). Current guidelines recommend moderate exercise for all pregnant women. However, little is known about the effect of exercise during pregnancy on the developing offspring. Rodent studies demonstrate that offspring from dams fed a high-fat diet have vessel-specific impairment in endothelium-dependent vascular function, greater adiposity, and impairments in glucose homeostasis. Further, offspring from exercised dams have improved glucose homeostasis. OBJECTIVE: In this thesis, I determined if maternal exercise during pregnancy mitigates the adverse effects of maternal obesity on offspring adiposity, glucose homeostasis, and vascular health in female offspring.METHODS: Dams (C57BL/6) were fed a control (10% energy from fat) or western diet (45% energy from fat) from weaning for 13 weeks and through breeding, pregnancy, and lactation. Just prior to breeding, dams were put into cages with or without a running wheel for voluntary exercise through breeding, pregnancy, and lactation. Offspring were weaned onto the control or western diet and maintained on the diet for 20 weeks; only female offspring were studied. Lean and fat mass were quantified by ¹H-NMR. Intraperitoneal insulin tolerance (IPITT), glucose tolerance (IPGTT) and insulin secretion tests (IPIST) were performed prior to the end of the feeding period. Vascular endothelial-dependent and independent dilatation were assessed ex vivo by isometric force measurements of aortic rings in response to phenylephrine, acetylcholine, and sodium nitroprusside.RESULTS: Weaning weights were greater in offspring from western-fed dams than control-fed dams. Control-fed offspring from western-fed dams had higher heart and kidney weights than those from control-fed dams. Control-fed offspring from exercised dams had higher blood glucose concentrations at IPGTT₃₀minutes than those from sedentary dams. Western-fed offspring from exercised dams had greater body weights, retroperitoneal fat weights, and Il10 mRNA in retroperitoneal adipose tissue, and lower blood glucose concentrations at IPGTT₉₀minutes than those from sedentary dams. Endothelium-dependent vasorelaxation of thoracic aortae was likely unaffected by maternal western diet or maternal exercise in control-fed and western-fed offspring.CONCLUSION: These findings suggest maternal exercise is beneficial in improving glucose homeostasis and adiposity in western-fed female offspring.

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Maternal B-vitamin status during development and programming of adult offspring adiposity (2017)

Developmental programming suggests that perinatal environmental conditions can impact risk for chronic diseases. Population studies have reported greater insulin resistance and adiposity in offspring from mothers with adequate folate but low vitamin B12 (B12) status during pregnancy. Rodent studies have reported that these effects are sex-specific. Folate, a methyl nutrient, is metabolically linked to B12. Low B12 status, even when folate is adequate, can trap folate in a metabolically inactive form. Folate deficiency is rare in Canada due to folic acid fortification of grains, yet one in 20 Canadians are estimated to be B12-deficient. The objective of this thesis is to determine the mechanisms underlying the relationship between maternal B-vitamin status during pregnancy and offspring adiposity and glucose homeostasis.In vitro experiments assessed direct effects of folic acid on adipocyte energy metabolism. In 3T3-L1 adipocytes, cells treated with 1.6μM folic acid had lower (p≤0.05) mitochondrial respiration rates than cells treated with 0.16μM folic acid. Adipocytes treated with 1.6μM 5-methyltetrahydrofolate (5-MTHF), the circulating form of folate, had higher (p≤0.01) mitochondrial respiration rates than cells treated with 0.16μM 5-MTHF.Female mice (C57BL/6J) were fed one of three maternal diets six weeks prior to breeding and through pregnancy/lactation: control (M-CON), supplemental folic acid with adequate B12 (SFA+B12), or SFA without B12 (SFA-B12). One male and one female from each dam were weaned onto either a control or western diet (45% kcal fat). Sex-specific differences by maternal diet were observed in the offspring. Female control-fed SFA-B12 offspring had lower (p≤0.05) serum IGF-1 (insulin-like growth factor-1) concentrations than M-CON and SFA+B12 offspring. This was accompanied by higher (p≤0.05) hepatic Cpt1a mRNA in SFA-B12 and SFA+B12 offspring than M-CON offspring. Female western-fed SFA+B12 offspring had higher (p≤0.05) hepatic FADS2 and ELOVL2 protein than M-CON offspring. Conversely, male control-fed SFA-B12 offspring had higher (p≤0.05) hepatic linoleic acid (C18:2n-6) and lower (p≤0.05) eicosapentaenoic acid (C20:5n-3) concentrations, and lower (p=0.08) hepatic ELOVL2 protein than M-CON offspring.These findings suggest programming of offspring adiposity and glucose homeostasis by maternal B-vitamin status occurs through sex-specific alterations in IGF-1, and adipose tissue and hepatic lipid metabolism.

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Dietary Energy Intakes in Children with Mental Health Conditions Treated with Second-Generation Antipsychotics (2015)

Approximately one in six Canadian children suffer from mental health conditions (MHC), including: anxiety, bipolar disorder, and depression. Second-generation antipsychotics (SGAs) are increasingly used to treat children with MHCs. Recent evidence suggests that SGAs are implicated in rapid weight gain, increased measures of adiposity, and cardiometabolic dysfunction in the pediatric population. The mechanisms for these adverse side effects have yet to be elucidated. One postulation is that SGAs may increase dietary energy intakes; however, little is known about the diets of SGA-treated children. My thesis research explored dietary intake and its potential association with adiposity and cardiometabolic dysfunction, in SGA-treated children.This cross-sectional study recruited SGA-treated (n=25) and SGA-naïve (n=20) children (6-19 yrs) with MHCs, from the Psychiatry Department at BC Children’s Hospital. Demographics, medical history, and anthropometrics were obtained. In a subset, fasting plasma lipids, glucose, and insulin were obtained and the homeostatic model assessment of insulin resistance (HOMA-IR) was calculated. Three 24-hour food records were collected and analyzed for average three-day total energy (kcal), macronutrient, saturated fat, sugar, fibre, and sodium intakes. There were no statistically significant differences between groups for energy intakes (mean ± SD; 2036.5±715.8 vs. 1725.5 ± 545.6, P = 0.352) or macronutrient, saturated fat, sugar, fibre, and sodium intakes; adjusting for sex, height, pubertal status, and psychostimulant medications. SGA-treated children had higher zBMI (p=0.001), waist circumference (p=0.019), and HOMA-IR (p=0.009), compared to SGA-naïve children. There were no associations of energy intake and measures of adiposity. There were positive associations of sodium intake and HOMA-IR (p=0.017; 95% CI: 0.013, 0.109) and saturated fat intake and low-density lipoprotein cholesterol (LDL-c) (p=0.041; 95% CI: 0.004, 0.170), in the SGA-treated group; adjusting for sex, pubertal status, overweight/obesity, height, and psychostimulant treatment. These data suggest that SGA-treated children do not have greater dietary energy intakes compared to SGA-naïve children, and dietary energy intakes may not be responsible for greater measures of adiposity in SGA-treated children. However, the positive associations of sodium intake with HOMA-IR, and saturated fat intake with LDL-c, in SGA-treated children, suggest that dietary intakes in SGA-treated children may contribute to cardiometabolic dysfunction in this high-risk population.

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Programming of Hepatic Gene Expression by Maternal Folic Acid and Vitamin B12 Imbalance (2014)

Folate is a B-vitamin required for cell growth and division, and its metabolism is linked to vitamin B12 (B12). Food fortification with folic acid (FA) has improved folate status but approximately 5% of Canadian adults, including pregnant women, are B12 deficient. This is concerning because an association between gestational exposure to high maternal folate and low B12 status and greater adiposity and insulin resistance in children has been reported. My thesis examined the effect of developmental exposure to maternal FA/B12 imbalance on programming of liver gene expression in adult offspring using an animal model. Female C57BL/6 mice were fed a high FA/adequate B12 (HFA+B12), high FA/no B12 (HFA-B12), or control diet 6 weeks prior to mating and through pregnancy and lactation. At weaning, offspring mice from each maternal diet group were randomly assigned to receive the control diet or a Western diet (45% fat, 35% carbohydrate) for 20 weeks (n=6 male mice/group) or for 40 weeks (n=6 female mice/group). Serum folate and B12 concentrations were quantified by microbiological assays. Relative mRNA expression of key enzymes in methyl metabolism in liver from adult offspring was quantified by real-time PCR. Male offspring mice from dams fed the HFA-B12 diet had lower Cbs and Mthfr mRNA expression and this was unaffected by post weaning diet. Male offspring mice fed the Western diet had higher Mtr mRNA expression compared to control-fed offspring mice, regardless of maternal diet. Female offspring from dams fed the HFA-B12 diet had lower Mtr mRNA expression and this was not affected by post weaning diet. Moreover, female offspring from dams fed the HFA-B12 diet had higher Mthfr mRNA expression when they were fed the Western diet. No effect of maternal and post weaning diets was observed for serum folate and B12 concentrations.In summary, developmental exposure to maternal FA/B12 imbalance was found to program expression of genes involved in folate and methionine metabolism in the liver of adult offspring mice. The functional consequences of this effect requires further investigation in order to consider B12 screening of pregnant women and to inform the debate on whether B12 fortification should be considered.

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Programming of Stress Regulation in 5-7 Year Old Children by Maternal Gestational Mood and Antidepressant Use (2014)

Of particular importance to mental health across the life span is our capacity to regulate neuroendocrine responses to stressful events via the hypothalamic pituitary adrenal (HPA) axis. Prenatal exposure to maternal depression/anxiety may be among the earliest adverse experiences shown to influence the developing HPA system, possibly via changes in fetal serotonergic signaling. In addition, the developmental impact of prenatal exposure to serotonin reuptake inhibitor (SRI) antidepressants is often undistinguishable from prenatal maternal mood. The molecular mechanisms underlying how serotonin (5-HT) influences the development of the HPA stress system remain unclear, but may involve epigenetic mechanisms such as DNA methylation. This thesis explored whether prenatal exposure to SRIs and maternal depressed/anxious mood are associated with altered HPA stress reactivity, characterized by variable basal and stress-induced cortisol concentrations in 5 - 7 year-old children. Furthermore, the methylation status in promoter regions of NR3C1 1F (encodes the glucocorticoid receptor) and SLC6A4 (encodes the serotonin transporter) at birth and at 5 - 7 years of age was evaluated and the relationship to children’s cortisol patterns was assessed. Prenatal exposure to SRIs and higher 3rd trimester maternal depressed/anxious mood were associated with reduced cortisol stress responses at 5 - 7 years. Higher NR3C1 1F methylation at 5 - 7 years was associated with higher diurnal cortisol concentrations and a reduced cortisol stress response. Children exposed to mothers with higher 3rd trimester and concurrent anxious mood exhibited lower SLC6A4 methylation, compared to children exposed to higher 3rd trimester maternal anxious mood alone. Furthermore, children with higher SLC6A4 methylation at birth exhibited a reduced cortisol stress response. These findings suggest that the relationship between early life experiences and altered stress responses in early childhood may be moderated by epigenetic mechanisms involving the serotonergic and HPA regulatory systems. In addition, an interactive relationship between pre- and postnatal maternal mood with cortisol stress responses and methylation status at 5 - 7 years suggests that an early adverse environment may confer sensitivity toward altered HPA activity and regulation, and that the postnatal environment may shift the HPA stress response towards vulnerability or resilience to stress-related disorders across the lifespan.

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Programming of adult metabolic phenotype by maternal dietary folic acid and Vitamin B12 imbalance in mice (2013)

Prenatal and early postnatal nutrient status influences metabolic health in adulthood. A study from India reported that children born to women with high folate and low vitamin B12 status during pregnancy had increased adiposity and insulin resistance. Many countries, including Canada, fortify their grain products with folic acid. In Canada, women have adequate folate status but 1 in 20 may be vitamin B12 deficient. Currently, the metabolic consequences of developmental exposure to high folic acid, with or without vitamin B12 deficiency, are unknown. Female C57BL/6J mice were fed diets high in folic acid, with (HFA+B12) and without (HFA-B12) adequate vitamin B12, or a control diet throughout breeding, pregnancy and lactation. Offspring were weaned onto a control or western-type diet (WTD) for 30 weeks. Maternal and post-weaning diets affected visceral (P
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Role of vitamin D and adiponectin in ethnic-specific differences in body fat distribution and risk for cardiovascular disease (2012)

Background: Body fat distribution, in particular visceral adipose tissue (VAT), contributes to risk of cardiovascular disease (CVD). The Multicultural-Community Health Assessment Trial (M-CHAT) reported that South Asians have greater VAT than Europeans despite similar BMIs, putting them at greater risk of CVD. However, the molecular mechanisms underlying ethnic-specific differences in body fat distribution are unclear. Low circulating 25-hydroxyvitamin D (25OHD) and adiponectin concentrations are prevalent in individuals with obesity (BMI ≥ 30kg/m²), and are associated with increased risk of CVD. Furthermore, 25OHD is inversely associated with blood pressure. Adiponectin is an adipokine that has insulin-sensitizing, anti-inflammatory, and anti-atherogenic properties. Adiponectin circulates as isoforms low (LMW), medium (MMW), and the reported most biologically active isoform, high (HMW) molecular weight. This thesis aims to investigate ethnic-specific differences in the relationship between plasma 25OHD and adiponectin concentrations with body fat distribution and CVD risk factors.Methods/Results: Europeans (n=171) and South Asians (n=176) from the M-CHAT cohort were assessed for demographics, plasma 25OHD, total and HMW adiponectin concentrations, and CVD risk factors. A computed tomography (CT) scan was used to quantify VAT and subcutaneous adipose tissue (SAT) deposition. South Asians had lower (p
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Maternal mood during pregnancy, methyl nutrient metabolism, and serotonin transporter (2011)

Depression occurs in 15% of pregnant women and 1/3 are taking selective serotonin reuptake inhibitors (SSRIs) as antidepressants. The neurotransmitter, serotonin, plays a critical role in modulating stress responses and early brain development. Serotonin transporter (SLC6A4) regulates extracellular serotonin levels, and an insertion/deletion variant in the promoter (5HTTLPR) is associated with depression. Maternal mood and SSRIs may program newborns’ behaviour later in life. The underlying molecular mechanism for developmental programming may involve DNA methylation, which requires methyl nutrients as enzymatic cofactors. While low methyl nutrient status (folate and vitamin B₁₂) and a genetic variant in methylenetetrahydrofolate reductase (MTHFR C677T) have been associated with depression in adults, the role of methyl nutrient metabolism in depression during pregnancy remains unclear. Furthermore, little is known about the combined roles of methyl nutrient status and depression in the epigenetic regulation of SLC6A4. The experiments in this thesis explored whether disturbances in methyl nutrient metabolism and depressed mood during the 3rd trimester of pregnancy affect SLC6A4 methylation and expression in mothers and their newborns. Maternal folate status was positively associated with maternal SLC6A4 methylation at CpGs 1, 4, and 8 (P0.05). These results provide evidence to suggest that maternal mood during pregnancy and methyl nutrient metabolism may program SLC6A4 gene expression through DNA methylation in both mothers and their newborns. Mood during pregnancy and disturbances in methyl nutrient metabolism could set up life-long health consequences in the development of the offspring.

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