Management of Pregnant Women with Type 2 Diabetes Mellitus and the Consequences of Fetal Programming in Their Offspring

Assessment of maternal knowledge of infant movement and nutrition guidelines in Canada: The survey study (hysical activity, est, xercise and nutrition alues for ducation of ew moms with ype 2 diabetes/gestational diabetes)

Infants born to mothers with type 2 diabetes (T2D) and gestational diabetes (GDM) are at an increased risk of being overweight/obese. Modifiable lifestyle factors play a role in prevention of overweight and obesity. In 2017, the Canadian 24 h Movement Guidelines for the Early Years (CMG) were released. Alongside physical activity recommendations, sweetened beverage consumption (SBC) recommendations were also released by the American Academy of Pediatrics in 2017. The objective of this study was to determine the knowledge pregnant women with T2D and GDM have on the CMG and SBC recommendations, and to determine what factors affect this. A survey with questions regarding demographics, socioeconomic variables and the CMG and SBC recommendations was administered to pregnant women at Diabetes in Pregnancy clinics in Calgary, Alberta from July 2019 to January 2020. Surveys were analyzed utilizing the non-parametric Kruskall-Wallis Rank-Sum test, chi-square test and linear regression. A total of 79 respondents with T2D and GDM were collected. Respondents had the highest knowledge of SBC recommendations and the lowest knowledge of CMG recommendations. A bachelor's or higher degree was associated with significantly higher knowledge scores than a high-school education or less. In conclusion, pregnant women with T2D and GDM in this study had overall poor knowledge of the CMG and SBC recommendations, with less knowledge regarding the CMG. Level of education was found to be associated with knowledge regarding these recommendations. Future programs to improve education around infant and toddler physical activity and SBC recommendations may be beneficial for this patient population.

Associations Between Preconception Glycemia and Preterm Birth: The Potential Role of Health Care Access and Utilization

Background: Preconception diabetes is strongly associated with adverse birth outcomes. Less is known about the effects of elevated glycemia at levels below clinical cutoffs for diabetes. In this study, we estimated associations between preconception diabetes, prediabetes, and hemoglobin A1c (HbA1c) on the risk of preterm birth, and evaluated whether associations were modified by access to or utilization of health care services. Materials and Methods: We used data from Add Health, a US prospective cohort study with five study waves to date. At Wave IV (ages 24-32), glucose and HbA1c were measured. At Wave V (ages 32-42), women with a live birth reported whether the baby was born preterm. The analytic sample size was 1989. Results: The prevalence of preterm birth was 13%. Before pregnancy, 6.9% of women had diabetes, 23.7% had prediabetes, and 69.4% were normoglycemic. Compared to the normoglycemic group, women with diabetes had 2.1 (confidence interval [95% CI]: 1.5-2.9) times the risk of preterm birth, while women with prediabetes had 1.3 (95% CI: 1.0, 1.7) times the risk of preterm birth. There was a nonlinear relationship between HbA1c and preterm birth such that risk of preterm birth emerged after HbA1c = 5.7%, a standard cutoff for prediabetes. The excess risks of preterm birth associated with elevated HbA1c were four to five times larger among women who reported unstable health care coverage and among women who used the emergency room as usual source of care. Conclusion: Our findings replicate prior research showing strong associations between preconception diabetes and preterm birth, adding that prediabetes is also associated with higher risk. Policies and interventions to enhance access and utilization of health care among women before pregnancy should be examined.

Fetal programming of obesity and type 2 diabetes

The prevalence of obesity and type 2 diabetes mellitus has increased rapidly over the past few decades, and prevention efforts have not been successful. Fetal programming involves the earliest stage of obesity development, and provides a novel concept to complement other strategies for lifelong prevention of obesity and type 2 diabetes mellitus. The World Health Organization now advocates a life-course approach to prevent/control obesity, starting with pre-conceptional and antenatal maternal health. Maternal overnutrition, gestational diabetes mellitus and excessive gestational weight gain lead to fetal overgrowth, and “programs” the offspring with an increased risk of obesity and type 2 diabetes mellitus in childhood and adulthood. This review summarizes current data on fetal programming of obesity and type 2 diabetes mellitus including potential causative factors, mechanisms and interventions to reduce its impact.

An integrated primary care-based programme of PRE-Pregnancy cARE to improve pregnancy outcomes in women with type 2 Diabetes (The PREPARED study): protocol for a multi-method study of implementation, system adaptation and performance

BACKGROUND

The number of women of childbearing age with Type 2 diabetes(T2DM) is increasing, and they now account for > 50% of pregnancies in women with pre-existing diabetes. Diabetes pregnancies without adequate pre-pregnancy care have higher risk for poor outcomes (miscarriages, birth-defects, stillbirths) and are associated with increased complications (caesarean deliveries, macrosomic babies, neonatal intensive-care admissions). The risks and costs of these pregnancies can be reduced with pregnancy preparation (HbA1c, ≤ 6.5%, 5 mg folic acid and stopping potentially harmful medicines). However, 90% of women with T2DM, most of whom are based in primary care, are not adequately prepared for pregnancy. This study will evaluate a programme of primary care-based interventions (decision-support systems; pre-pregnancy care-pathways; pregnancy-awareness resources; professional training; and performance monitoring) to improve pregnancy preparation in women with T2DM.

METHODS

The study aims to optimise the programme interventions and estimate their impact on pregnancy preparation, pre-pregnancy care uptake and pregnancy outcomes. To evaluate this multimodal intervention, we will use a multi-method research design following Complex Adaptive Systems (CAS) theory, refining the interventions iteratively during the study. Thirty GP practices with ≥ 25 women with T2DM of reproductive age (18-45 years) from two South London boroughs will be exposed to the intervention. This will provide > 750 women with an estimated pregnancy incidence of 80-100 to study. The research involves: a clinical audit of processes and outcomes; a process evaluation informing intervention feasibility, implementation, and behaviour change; and a cost-consequences analysis informing future economic evaluation. Performance data will be collected via audits of GP systems, hospital antenatal clinics and pregnancy outcomes. Following CAS theory, we will use repeated measurements to monitor intervention impact on pregnancy preparation markers at 4-monthly intervals over 18-months. We will use performance and feasibility data to optimise intervention effects iteratively. The target performance for the intervention is a 30% increase in the proportion of women meeting pre-pregnancy care criteria.

DISCUSSION

The primary output will be development of an integrated programme of interventions to improve pregnancy preparation, pre-pregnancy care uptake, and reduce adverse pregnancy outcomes in women with T2DM. We will also develop an implementation plan to support the introduction of the interventions across the NHS.

TRIAL REGISTRATION

ISRCTN47576591 ; February 8, 2022.

Analysis and Intervention of Factors Affecting Abnormal Postpartum Glucose Tolerance and Gestational Recurrence in Gestational Diabetes

ObjectiveTo investigate the influencing factors of abnormal postpartum glucose tolerance and pregnancy recurrence in gestational diabetes mellitus (GDM) and to develop reasonable interventions to prevent postpartum glucose tolerance and recurrence of pregnancy. Methods. Retrospective analysis of clinical data of 238 GDM patients during pregnancy, including age, body mass index (BMI) before and after pregnancy, regular exercise during pregnancy, insulin use, family history of diabetes, fasting blood glucose (FPG) during pregnancy, oral glucose tolerance test (OGTT) 2 h time value, blood lipid index, and whether pregnant again. At the same time, the women were followed up by telephone or home visits to understand and guide the patient's diet and exercise. The clinical characteristics of the two groups of patients were compared. According to the OGTT test, the recovery of glucose tolerance in pregnant women 6–8 weeks postpartum was divided into the normal postpartum glucose tolerance group and the abnormal group. Logistic multivariate analysis was used to find the influencing factors of postpartum glucose tolerance and recurrence of pregnancy. Results. Between 238 patients of followed-up, 150 pregnant women had abnormal postpartum glucose tolerance, accounting for 63.03%. There were 115 repregnants, of whom 37 (32.17%) had a recurrence of postpartum glucose tolerance. Pre and postpregnancy BMI, insulin use during pregnancy, family history of diabetes, FPG during pregnancy, OGTT 2 h values, and triglyceride (TG) were independent risk factors for abnormal postpartum diabetes and recurrence of pregnancy in GDM patients. Conclusions. Patients with GDM are at high risk of postpartum abnormal glucose tolerance and pregnancy recurrence, which may be influenced by the pregnant woman's prepregnancy and postpartum BMI, insulin use during pregnancy, family history of diabetes, FPG, OGGT 2 h values during pregnancy, and TG levels. Therefore, health education for pregnant women should be strengthened in the clinic, with guidance on proper diet for weight control, increased exercise, and regular blood glucose screening and monitoring for those at risk.

Racial and Ethnic Disparities in Health Care and Health Outcomes for Pregnant Women With Diabetes

This article summarizes the current literature on racial and ethnic differences among women with diabetes in pregnancy. The PubMed, Scopus, CINAHL, and Embase databases were searched for original qualitative or quantitative studies published in English from January 1, 2009, to May 31, 2020. Consensus statements were excluded. Results of this synthesis indicate that racial and ethnic differences exist among pregnant women with diabetes, including social determinants of health, disparities in maternity care and perinatal care, and maternal and neonatal health outcomes. Health care providers should implement tailored interventions that specifically target racial and ethnic disparities in maternal and neonatal health to promote health equity in pregnant women with diabetes and their offspring, including later in life.

An integrated pre-pregnancy care programme framework theoretically modelled from the perspectives of women with Type 2 diabetes and healthcare professionals

BACKGROUND

Pregnancies in women with diabetes are associated with significant additional risks for the fetus, infant and mother such as, higher risk of stillbirths or congenital anomalies. Pre-pregnancy care can attenuate these risks. However, while women with Type 2 diabetes account for half of pregnancies in women with pre-existing diabetes, they are much less likely to receive pre-pregnancy care than women with Type 1 diabetes. This discrepancy may be related to the fact that most pre-pregnancy care is located in specialist diabetes centres where women with Type 1 diabetes are managed; whereas women with Type 2 diabetes are managed in primary care and reproductive care is not a routine element of diabetes care. Therefore, to improve pre-pregnancy care among women with Type 2 diabetes strategies need to be tailored to the specific needs of this group and the context of their diabetes care.

OBJECTIVES

This paper seeks to inform the development of an integrated pre-pregnancy care programme by presenting strategies identified by women with Type 2 diabetes and healthcare professionals that address some of the barriers they experience in relation to pre-pregnancy care.

METHODS

A qualitative study using semi-structured in-depth interviews with women of reproductive age with Type 2 diabetes (n=30) and diabetes healthcare professionals (n=22) from both primary and secondary care. Data were transcribed verbatim and analysed thematically using Framework Analysis. The identified themes were then mapped to create a theoretical intervention framework using Normalisation Process Theory and the Capabilities, Opportunity, and Motivation to perform a Behaviour model.

RESULTS

Six themes were identified expressing the need for a multimodal approach for improving the uptake of pre-pregnancy care in women with Type 2 diabetes. These themes were then mapped onto the constructs of Normalisation Process Theory as follows: coherence (enhancing understanding of reproductive needs among women and healthcare professionals); cognitive participation (constructing a positive narrative for pregnancy and Type 2 diabetes); collective action (increasing the visibly of the reproductive needs of women, integrating healthcare systems and utilising supportive technologies); and reflexive monitoring (using multi-modal approaches to support systemised care). The data were also modelled to identify target behaviours for intervention detailing what needs to be done by whom, when and where.

CONCLUSION

Women with Type 2 diabetes account for half of pregnancies in those with pre-existing diabetes; however, they are less likely to receive pre-pregnancy care than women with Type 1 diabetes. Pre-pregnancy care can reduce the maternal and fetal risks associated with Type 2 diabetes. This study presents strategies to improve the current low uptake of pre-pregnancy care for women with Type 2 diabetes. These strategies have been tailored to the specific needs of women and healthcare professionals and support integration within the woman's routine diabetes management.

Effect of type 2 diabetes mellitus on placental expression and activity of nutrient transporters and their association with birth weight and neonatal adiposity

AIMS

Infants born to women with Type 2 Diabetes Mellitus (T2DM) are at risk of being born large for gestational age due to excess fetal fat accretion. Placental nutrient transport determines fetal nutrient availability, impacting fetal growth. The aims of the study were to evaluate the effect of T2DM on placental insulin signaling, placental nutrient transporters and neonatal adiposity.

METHODS

Placentas were collected from BMI-matched normoglycemic controls (NGT, n = 9) and T2DM (n = 9) women. Syncytiotrophoblast microvillous (MVM) and basal (BM) plasma membranes were isolated. Expression of glucose (GLUT1, -4), fatty acid (FATP2, -4, -6, FAT/CD36), amino acid (SNAT1, -2, -4, LAT1, -2) transporters, insulin signaling, and System A transporter activity was determined. Neonatal fat mass (%) was measured in a subset of neonates born to T2DM women.

RESULTS

GLUT1 protein expression was increased (p = 0.001) and GLUT4 decreased (p = 0.006) in BM from T2DM. MVM FATP6 expression was increased (p = 0.02) and correlated with birth weight in both T2DM and NGT groups (r = 0.65, p = 0.02). BM FATP6 expression was increased (p = 0.01) in T2DM. In MVM of T2DM placentas, SNAT1 expression was increased (p = 0.05) and correlated with birth weight (r = 0.84, p = 0.004); SNAT2 was increased (p = 0.01), however System A transporter activity was not different between groups. MVM LAT1 expression was increased (p = 0.01) in T2DM and correlated with birth weight (r = 0.59, p = 0.04) and neonatal fat mass (r = 0.76, p = 0.06).

CONCLUSION

In pregnancies complicated by T2DM placental protein expression of transporters for glucose, amino acids and fatty acids is increased, which may contribute to increased fetal growth and neonatal adiposity.

A qualitative study exploring the factors that influence the uptake of pre-pregnancy care among women with Type 2 diabetes

AIM

To elicit the views and experiences of women with Type 2 diabetes and healthcare professionals relating to the pregnancy and pre-pregnancy care they have received or provided.

METHODS

A qualitative study using in-depth semi-structured interviews with women with Type 2 diabetes (n=30) and healthcare professionals (n=22) from primary and specialist care. Women were purposively sampled to include different experiences of pregnancy and pre-pregnancy care. Data were transcribed verbatim and analysed thematically using Framework Analysis.

RESULTS

The median age of the women was 37 years, and most were obese (median BMI 34.9 kg/m² ), of black or Asian ethnicity (n=24, 80%) and from areas of high deprivation (n=21, 70%). Participating healthcare professionals were from primary (n=14), intermediate (n=4) and secondary (n=4) care. Seven themes expressing factors that mediate reproductive behaviour and care in women with Type 2 diabetes were identified at the patient, professional and system levels. Type 2 diabetes was generally perceived negatively by the women and the healthcare professionals. There was a lack of awareness about the pre-pregnancy care needs for this population, and communication between both groups was unhelpful in eliciting the reproductive intentions of these women. The themes also reveal a lack of systemic processes to incorporate pre-pregnancy care into the care of women with Type 2 diabetes, and consequently, health professionals in primary care have limited capacity to provide such support.

CONCLUSION

If the current high levels of unprepared pregnancies in women with Type 2 diabetes are to be reduced, the reproductive healthcare needs of this group need to be embedded into their mainstream diabetes management.

A Practice-Based Research Database to Study Perinatal Nurse Home Visiting to Pregnant Women With Diabetes

BACKGROUND AND AIMS

Accumulation of real-world evidence from practice-based perinatal nurse home visits to pregnant women with diabetes prompted this translational perinatal health disparities research. Given the global diabetes epidemic, this academic-community partnered research team is studying the utilization, processes, and outcomes of this understudied model of perinatal nurse home visiting that provide home-based enhanced diabetes care to pregnant women. Because the nursing records provide the rich source of data for the study, our aim is to provide an in-depth description of the Philadelphia Pregnancy and Diabetes Home Visiting (PPD-HV) research database developed from data in the longitudinal nursing records.

METHODS

This descriptive study uses retrospective data abstracted from paper-based perinatal nurse home visiting clinical records to create the PPD-HV, a HIPAA compliant, secure REDCap electronic research database. The sample includes 248 urban, pregnant women with diabetes who received a total of 1,644 home visits during the year 2012. The setting was Philadelphia, a large metropolitan city in the northeastern part of the United States. The PPD-HV database followed the information fields of the paper-based clinical nursing forms, which were originally designed by following the Omaha System to guide documenting the nursing process used in caring for patients in their homes.

RESULTS

Using REDCap, the PPD-HV research database is robust with 239 variables and captures longitudinal clinical nursing data. Among the pregnant women with diabetes receiving nurse home visits, the mean age was 30.7 years, most were single, and had given birth to other children.

LINKING EVIDENCE TO ACTION

Real-world clinical nursing practice data provide a rich source of research data to advance understandings about this model of enhanced diabetes care and the pregnant women with diabetes receiving the care. Considering the global epidemic of diabetes, this is a perinatal nurse home visiting model to replicate and evaluate.

Contraceptive Use Among Women with Prediabetes and Diabetes in a US National Sample

INTRODUCTION

Although elevated blood glucose is associated with adverse maternal and fetal health outcomes, evidence suggests that women with diabetes may not be receiving comprehensive reproductive health care, including family planning and preconception care. Using a population-based sample, we evaluated the relationship between contraceptive use and biomarker-identified diabetes.

METHODS

This cross-sectional study used data from 5548 women in the nationally representative National Longitudinal Study of Adolescent to Adult Health (Add Health) from 2007 to 2009. Women were aged 24 to 32 years, sexually active with men, and not pregnant. Hemoglobin A1C identified prediabetes and diabetes from blood specimens. The primary outcome was most effective contraception used in the past year: more effective (sterilization, intrauterine device, implant, combined hormonal methods, or injectable), less effective (condoms, diaphragms, spermicides, natural family planning, or withdrawal), or none. Multinomial regression models were adjusted for race and ethnicity, education, insurance, health care access, and body mass index.

RESULTS

Of the women with diabetes, 37.6% used more effective contraception, 33.6% less effective contraception, and 28.8% none. Women with diabetes had higher odds of using no contraception, rather than more effective contraception, than women with normoglycemia (adjusted odds ratio [aOR], 1.90; 95% CI, 1.25-2.87). Women with diabetes who were undiagnosed had greater odds of using less effective contraception, rather than more effective contraception, compared with those who were diagnosed (aOR 3.39; 95% CI, 1.44-7.96). Contraceptive use did not differ between women with prediabetes and normoglycemia.

DISCUSSION

Less effective contraceptive methods were commonly used by women with diabetes. Midwives and other women's health care providers can support women with diabetes to reach their pregnancy goals by providing preconception care and family planning.

Comorbid hypertension and diabetes among U.S. women of reproductive age: Prevalence and disparities

AIMS

Diabetes is associated with significant pregnancy complications, which can be further exacerbated by comorbid hypertension. Racial/ethnic differentials in the burden of comorbid hypertension and diabetes among women of reproductive age have not been described.

METHODS

Using Wave IV of the nationally representative National Longitudinal Study of Adolescent to Adult Health (Add Health), we analyzed survey and biological data from 6576 non-pregnant women who were aged 24-32 in 2007-2008. Hypertension and diabetes were identified by self-report of diagnosis and biological measurements taken during in-home interviews. We used logistic regression models to predict the presence of comorbid hypertension and diabetes and whether each was diagnosed.

RESULTS

Over a third (36.0%) of women with diabetes had comorbid hypertension. Compared to non-Hispanic white women, more non-Hispanic black women had comorbid hypertension and diabetes (adjusted odds ratio (aOR) 5.93, 95% CI 3.84-9.16), and, if comorbid, were less likely to have a diabetes diagnosis (aOR 0.03, 95% CI 0.007-0.1) or hypertension diagnosis (aOR 0.22, 95% CI 0.08-0.65).

CONCLUSION

Comorbid hypertension and diabetes are more common among non-Hispanic black women and less likely to be diagnosed, signaling disparities threatening maternal and child health among women with diabetes.

Racial/Ethnic Disparities in Diabetes Diagnosis and Glycemic Control Among Women of Reproductive Age

BACKGROUND

Types 1 and 2 diabetes mellitus complicate pregnancies and threaten the health of women of reproductive age and their children. Among older adults, diabetes morbidity disproportionately burdens racial/ethnic minorities, but diabetes emergence among younger adults has not been as well characterized. The objective of this study was to describe the distribution of diagnosed diabetes, undiagnosed diabetes, suboptimal preconception glycemic control, and prediabetes among women of reproductive age across racial/ethnic backgrounds.

MATERIALS AND METHODS

We analyzed data collected in 2007-2008 from 6774 nonpregnant women, ages 24-32, in the National Longitudinal Study of Adolescent to Adult Health (Add Health). Prediabetes and undiagnosed diabetes were identified by fasting glucose and glycosylated hemoglobin (A1C) and diagnosed diabetes by self-report or antihyperglycemic medication use. We used multinomial regression models to predict prediabetes or diabetes versus normoglycemia. Within women with diabetes, we used logistic regression to predict those being undiagnosed and having suboptimal preconception glycemic control based on A1C.

RESULTS

The estimated prevalence of diabetes was 6.8%, of which 45.3% was undiagnosed. Diabetes prevalence varied by race/ethnicity (p < 0.001): 15.0% of non-Hispanic black women (75.6% undiagnosed), 7.5% of Hispanic women (48.1% undiagnosed), 4.8% of non-Hispanic white women (22.8% undiagnosed), and 4.5% of Asian women (11.4% undiagnosed). The prevalence of prediabetes was highest in non-Hispanic black (38.5%), followed by Hispanic (27.8%), Asian (25.1%), Native American (20.3%), and non-Hispanic white (16.6%) women.

CONCLUSIONS

Racial/ethnic disparities exist among women of reproductive age with prediabetes and diabetes. Meeting their healthcare needs requires addressing health inequities and coordination of diabetes management with reproductive health.

Maternal and neonatal demographics of macrosomic infants admitted to the neonatal intensive care unit

OBJECTIVE

The objective of this study is to determine the incidence, significance, associated demographics and impact of macrosomic infants (⩾4 kg) admitted to the Neonatal Intensive Care Unit (NICU) on NICU census and resources.

STUDY DESIGN

A retrospective cohort review was performed from 2010 to 2015. Descriptive statistical analyses were used.

RESULTS

Of 19 308 deliveries, 1823 were infants ⩾4000 g and 213 were admitted to the NICU. Cesarean delivery occurred in 70% of the admitted infants, most (74.1%) were Grade 1 macrosomia and male (63%). Preterm birth occurred in 4%. The incidence of maternal diabetes was 25%. Primary admitting diagnoses were respiratory distress, suspected sepsis, hypoglycemia and perinatal depression. The average length of stay was 8±6 days for all macrosomic infants admitted, increased to 22±13 days for infants with Grade 3 macrosomia.

CONCLUSION

Macrosomic infants are a growing population, who increase the demand on existing NICU resources. A larger multi-centered study is needed to determine the overall relevance of these findings in other populations.

Gestational retinal microvasculature and the risk of 5 year postpartum abnormal glucose metabolism

AIMS/HYPOTHESIS

Changes in retinal microvasculature may reflect insulin resistance. We examined the association of changes in retinal microvasculature during pregnancy and risk of subsequent abnormal glucose metabolism in a cohort of mothers at baseline and 5 years postpartum.

METHODS

Of the participants from the Singapore birth cohort (Growing Up in Singapore Towards Healthy Outcomes [GUSTO]), 276 mothers attended both baseline (at 26-28 weeks of gestation) and follow-up (5 year postpartum) visits. At baseline we performed retinal photography and assessed retinal microvascular variables using a validated grading system. At follow-up, we assessed glucose tolerance using a 75 g OGTT. We defined abnormal glucose metabolism if participants: (1) had onset of gestational diabetes mellitus (GDM) in subsequent pregnancies within a 5 year follow-up period (n = 103) or (2) had prediabetes (impaired fasting glucose, impaired glucose tolerance or HbA_1c 5.7-6.4% [39-46 mmol/mol]) and diabetes diagnosed at the 5 year follow-up visit (n = 84), according to WHO guidelines.

RESULTS

The incidence of GDM in subsequent pregnancy and abnormal glucose metabolism 5 years postpartum was 25.2% and 30.4%, respectively. Each 10 μm widening in retinal venular calibre was associated with a significant risk of postpartum abnormal glucose metabolism (RR 1.2 [95% CI 1.0, 1.5]), independent of maternal age, college education, ethnicity, pre-pregnancy BMI and GDM at baseline. Narrower retinal arteriolar calibre and venular branching angle at baseline was associated with a higher insulin resistance index (1.4 [95% CI 1.1, 1.7] and 1.3 [95% CI 1.1, 1.6], respectively) at follow-up.

CONCLUSIONS/INTERPRETATION

Retinal microvasculature in pregnant women was associated with abnormal glucose metabolism 5 years postpartum. Alteration of microvascular structure during pregnancy may signal subclinical changes that underlie the development of prediabetes and diabetes.

Fetal programming of the metabolic syndrome

Prenatal development is currently recognized as a critical period in the etiology of human diseases. This is particularly so when an unfavorable environment interacts with a genetic predisposition. The fetal programming concept suggests that maternal nutritional imbalance and metabolic disturbances may have a persistent and intergenerational effect on the health of offspring and on the risk of diseases such as obesity, diabetes, and cardiovascular diseases.

MECHANISMS IN ENDOCRINOLOGY: Neurodevelopmental disorders in children born to mothers with thyroid dysfunction: evidence of fetal programming?

Fetal programming is a long-standing, but still evolving, concept that links exposures during pregnancy to the later development of disease in the offspring. A fetal programming effect has been considered within different endocrine axes and in relation to different maternal endocrine diseases. In this critical review, we describe and discuss the hypothesis of fetal programming by maternal thyroid dysfunction in the context of fetal brain development and neurodevelopmental disorders in the offspring. Thyroid hormones are important regulators of early brain development, and evidence from experimental and observational human studies have demonstrated structural and functional abnormalities in the brain caused by the lack or excess of thyroid hormone during fetal brain development. The hypothesis that such abnormalities introduced during early fetal brain development increase susceptibility for the later onset of neurodevelopmental disorders in the offspring is biologically plausible. However, epidemiological studies on the association between maternal thyroid dysfunction and long-term child outcomes are observational in design, and are challenged by important methodological aspects.

High insulin impaired ovarian function in early pregnant mice and the role of autophagy in this process

Metabolic disorders, such as PCOS (polycystic ovarian syndrome) and T2DM (type 2 diabetes mellitus), are associated with menstrual dysfunction, anovulation, infertility, and early pregnancy loss. Ovarian dysfunction is not only related to low pregnancy rates but also to the increased risk of miscarriage. Women with PCOS or T2DM, characterized by hyperinsulinemia, commonly experience ovarian dysfunction. In this study, we first explored whether high insulin levels directly affected ovarian functioning during embryo implantation. Mice in the insulin-treated group were given a subcutaneous injection of human recombinant insulin. After insulin treatment, serum levels of E2 (estrogen), PROG (progesterone), LH (luteinizing hormone), and FSH (follicle-stimulating hormone) were obviously lower, and there was a significant decrement of ovarian GDF9 (growth differentiation factor 9) mRNA. H&E (hematoxylin and eosin) staining showed a greater number of immature follicles and less luteinization in the insulin group. Further autophagy was studied in this process. A significant increase of P62 (SQSTM1/Sequestosome1) and a decrease of Cathepsin B, BECN1 (Beclin 1), and ULK1 (Unc-51-like kinase 1) mRNA in ovary was found in the insulin group. Western blot analysis showed that the expressions of LC3 (microtubule-associated protein 1 light chain 3), BECN1, and Cathepsin B proteins in ovaries from insulin group were obviously reduced, while P62 proteins were significantly increased. All these results illustrated that insulin could directly impair ovarian function during embryo implantation and the imbalance of ovarian autophagy due to insulin. Autophagy could enhance the impaired ovarian function results from insulin.