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Vanlaer Y, Minschart C, Vrolijk H, Van Crombrugge P, Moyson C, Verhaeghe J, Devlieger R, Vandeginste S, Verlaenen H, Vercammen C, Maes T, Dufraimont E, Roggen N, De Block C, Jacquemyn Y, Mekahli F, De Clippel K, Van Den Bruel A, Loccufier A, Van Pottelbergh I, Myngheer N, Abrams P, Vinck W, Leuridan L, Driessens S, Billen J, Matthys C, Bogaerts A, Laenen A, Mathieu C, Benhalima K. Impact of breastfeeding on risk of glucose intolerance in early postpartum after gestational diabetes. Front Endocrinol (Lausanne) 2024; 15:1374682. [PMID: 38933819 PMCID: PMC11199774 DOI: 10.3389/fendo.2024.1374682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 05/23/2024] [Indexed: 06/28/2024] Open
Abstract
Aims To determine the impact of breastfeeding on the risk of postpartum glucose intolerance in women with gestational diabetes. Methods Sub-analysis of two multi-centric prospective cohort studies (BEDIP-N and MELINDA) in 1008 women with gestational diabetes. Data were collected during pregnancy and at a mean of 12 weeks postpartum. Multivariate logistic regression was used to estimate the effect of breastfeeding on glucose intolerance, with adjustment for ethnicity, education, income, professional activity and BMI. Results Of all participants, 56.3% (567) breastfed exclusively, 10.1% (102) gave mixed milk feeding and 33.6% (339) did not breastfeed. Mean breastfeeding duration was 3.8 ± 2.4 and 3.7 ± 2.1 months in the breastfeeding and mixed milk feeding groups (p=0.496). The rate of glucose intolerance was lower in both the breastfeeding [22.3% (126)] and mixed milk feeding [25.5% (26)] groups compared to the no breastfeeding group [29.5% (100)], with an adjusted OR of 0.7 (95% CI 0.5-1.0) for glucose intolerance in the breastfeeding group compared to no breastfeeding group and an adjusted OR of 0.7 (95% CI 0.4-1.2) for the mixed milk feeding group compared to the no breastfeeding group. Postpartum, breastfeeding women had a lower BMI, less often postpartum weight retention, lower fasting triglycerides, less insulin resistance and a higher insulin secretion-sensitivity index-2 than the mixed milk feeding and no breastfeeding group. The mixed milk feeding group was more often from an non-White background, had a lower blood pressure and lower fasting triglycerides compared to the no breastfeeding group. Conclusions Breastfeeding (exclusive and mixed milk feeding) is associated with less glucose intolerance and a better metabolic profile in early postpartum in women with gestational diabetes.
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Affiliation(s)
- Yana Vanlaer
- Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Caro Minschart
- Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | | | - Paul Van Crombrugge
- Department of Endocrinology, OLV Ziekenhuis Aalst-Asse-Ninove, Aalst, Belgium
| | - Carolien Moyson
- Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Johan Verhaeghe
- Department of Obstetrics & Gynecology, UZ Gasthuisberg, KU Leuven, Leuven, Belgium
| | - Roland Devlieger
- Department of Obstetrics & Gynecology, UZ Gasthuisberg, KU Leuven, Leuven, Belgium
- REALIFE Research Group, Research Unit Woman and Child, Department of Development and Regeneration, KU Leuven, Leuven, Belgium
- Department of Obstetrics and Gynecology, GZA Hospitals Sint-Augustinus, Antwerp, Belgium
| | - Sofie Vandeginste
- Department of Obstetrics & Gynecology, OLV Ziekenhuis Aalst-Asse-Ninove, Aalst, Belgium
| | - Hilde Verlaenen
- Department of Obstetrics & Gynecology, OLV Ziekenhuis Aalst-Asse-Ninove, Aalst, Belgium
| | - Chris Vercammen
- Department of Endocrinology, Imelda Ziekenhuis, Bonheiden, Belgium
| | - Toon Maes
- Department of Endocrinology, Imelda Ziekenhuis, Bonheiden, Belgium
| | - Els Dufraimont
- Department of Obstetrics & Gynecology, Imelda Ziekenhuis, Bonheiden, Belgium
| | - Nele Roggen
- Department of Obstetrics & Gynecology, Imelda Ziekenhuis, Bonheiden, Belgium
| | - Christophe De Block
- Department of Endocrinology-Diabetology-Metabolism, Antwerp University Hospital, Edegem, Belgium
| | - Yves Jacquemyn
- Department of Obstetrics & Gynecology, Antwerp University Hospital, Edegem, Belgium
- ASTARC and GHI, Antwerp University, Antwerp, Belgium
| | - Farah Mekahli
- Department of Endocrinology, Kliniek St-Jan Brussel, Brussel, Belgium
| | - Katrien De Clippel
- Department of Obstetrics & Gynecology, Kliniek St-Jan Brussel, Brussel, Belgium
| | | | - Anne Loccufier
- Department of Obstetrics & Gynecology, AZ St Jan Brugge, Brugge, Belgium
| | | | - Nele Myngheer
- Department of Endocrinology, General Hospital Groeninge Kortrijk, Kortrijk, Belgium
| | - Pascale Abrams
- Department of Endocrinology, ZAS Hospital Sint-Vincentius, Antwerpen, Belgium
- Department of Endocrinology, ZAS Hospital Sint-Augustinus, Antwerpen, Belgium
| | - Wouter Vinck
- Department of Endocrinology, ZAS Hospital Sint-Augustinus, Antwerpen, Belgium
| | - Liesbeth Leuridan
- Department of Endocrinology, General Hospital Klina, Brasschaat, Belgium
| | - Sabien Driessens
- Department of Endocrinology, General Hospital Klina, Brasschaat, Belgium
| | - Jaak Billen
- Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Christophe Matthys
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium
| | - Annick Bogaerts
- Department of Development and Regeneration, KU Leuven, Leuven, Belgium
- Faculty of Health, University of Plymouth, Plymouth, Devon, United Kingdom
| | - Annouschka Laenen
- Center of Biostatics and Statistical Bioinformatics, KU Leuven, Leuven, Belgium
| | - Chantal Mathieu
- Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - Katrien Benhalima
- Clinical and Experimental Endocrinology, Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
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Graff TC, Birmingham WC, Wadsworth LL, Hung M. Doing it all: Effects of Family Responsibilities and Marital Relationship Quality on Mothers' Ambulatory Blood Pressure. Ann Behav Med 2024; 58:67-78. [PMID: 37824850 PMCID: PMC10729791 DOI: 10.1093/abm/kaad058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2023] Open
Abstract
BACKGROUND The shared provider responsibility between married couples does not translate to equally shared division of childcare (CC) and household labor. While some marriages contain highly positive aspects, marriages may also simultaneously contain both positive and negative aspects. The negativity in these relationships can negate the positivity and could potentially lead to the detriment of mothers' health. PURPOSE We examined mothers' ambulatory blood pressure (ABP) associated with their marital relationship quality and perceived equity with her spouse on CC and household tasks. METHODS We investigate these associations using a mixed multilevel model analysis on a sample of 224 mothers in heterosexual marriages, all of whom had children under the age of 18 years currently living in the home. RESULTS Mothers' perception of equity in the division of CC responsibilities contributed to lower ABP. Additionally, mothers in supportive marital relationships (low negativity and high positivity) had lower ABP than those in ambivalent relationships (both high negativity and positivity). There was a crossover interaction such that the effect of relationship quality on ABP was moderated by the perception of equity in the division of CC. For mothers who report doing all the CC, they had lower ABP if they had a supportive marital relationship compared with mothers in ambivalent relationships. Whereas mothers who report more equity in CC and have a supportive relationship have higher ABP compared with mothers in ambivalent relationships. CONCLUSIONS This study has implications related to dynamics within marital relationships. These results demonstrate important relational influences on mothers' ABP.
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Affiliation(s)
- Tyler C Graff
- Department of Psychology, Brigham Young University, Provo, UT, USA
| | | | - Lori L Wadsworth
- Romney Institute of Public Service and Ethics, Brigham Young University, Provo, UT, USA
| | - Man Hung
- Division of Public Health, University of Utah, Salt Lake City, UT, USA
- College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT, USA
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Tsingotjidou AS. Oxytocin: A Multi-Functional Biomolecule with Potential Actions in Dysfunctional Conditions; From Animal Studies and Beyond. Biomolecules 2022; 12:1603. [PMID: 36358953 PMCID: PMC9687803 DOI: 10.3390/biom12111603] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 10/20/2022] [Accepted: 10/23/2022] [Indexed: 10/13/2023] Open
Abstract
Oxytocin is a hormone secreted from definite neuroendocrine neurons located in specific nuclei in the hypothalamus (mainly from paraventricular and supraoptic nuclei), and its main known function is the contraction of uterine and/or mammary gland cells responsible for parturition and breastfeeding. Among the actions of the peripherally secreted oxytocin is the prevention of different degenerative disorders. These actions have been proven in cell culture and in animal models or have been tested in humans based on hypotheses from previous studies. This review presents the knowledge gained from the previous studies, displays the results from oxytocin intervention and/or treatment and proposes that the well described actions of oxytocin might be connected to other numerous, diverse actions of the biomolecule.
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Affiliation(s)
- Anastasia S Tsingotjidou
- Laboratory of Anatomy, Histology and Embryology, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54 124 Thessaloniki, Greece
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Plasma oxytocin is modulated by mental training, but does not mediate its stress-buffering effect. Psychoneuroendocrinology 2022; 141:105734. [PMID: 35367715 DOI: 10.1016/j.psyneuen.2022.105734] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 11/22/2022]
Abstract
Based on its role in social processing and stress, oxytocin has been suggested to mediate stress reduction of socio-affective, compassion-based mental training. We tested this hypothesis in the ReSource Project, a 9-month longitudinal mental training study. Participants practiced three different types of mental training, targeting either attentional abilities (Presence Module), socio-affective or socio-cognitive abilities (Affect and Perspective Modules). We investigated plasma oxytocin levels, and their link to cortisol and subjective reactivity to acute psychosocial stress as a function of previous mental training (n = 313). In a subsample (n = 113), to better understand oxytocin's involvement in the effects of socio-affective training, we explored oxytocin, cortisol and subjective experiential responses to a single Loving-kindness Meditation (LKM) conducted after three months of Affect training (versus rest without prior training). We found that, independent of mental training, stress triggered acute oxytocin release. Following a single LKM, however, acute oxytocin release was unaffected. Training effects were only found in overall oxytocin release during both, stress and LKM. Compared to no training, 3-month compassion-based Affect training decreased overall oxytocin levels in the context of psychosocial stress, but increased overall oxytocin levels during LKM. Training-induced changes in overall oxytocin were unrelated to cortisol and subjective stress reactivity. Based on Quintana and Guastella's (2020) theory of oxytocin as an allostatic hormone with anticipatory properties, we interpret training-induced changes in overall oxytocin levels as alterations in the anticipated emotional relevance of specific events. After training socio-affective skills for three months, the stressful situation may have lost its emotional saliency, whereas the meditation technique itself gained emotional relevance. We conclude that changes in peripheral oxytocin release do not mediate stress reduction after mental training, and encourage the investigation of an allostatic concept of oxytocin in future research.
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Caicedo Mera JC, Cárdenas Molano MA, García López CC, Acevedo Triana C, Martínez Cotrina J. Discussions and perspectives regarding oxytocin as a biomarker in human investigations. Heliyon 2021; 7:e08289. [PMID: 34805562 PMCID: PMC8581272 DOI: 10.1016/j.heliyon.2021.e08289] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/08/2021] [Accepted: 10/26/2021] [Indexed: 12/26/2022] Open
Abstract
This article introduces a review of research that has implemented oxytocin measurements in different fluids such as plasma, cerebrospinal fluid, urine and, mainly, saliva. The main purpose is to evaluate the level of evidence supporting the measurement of this biomarker implicated in a variety of psychological and social processes. First, a review of the technical developments that allowed the characterization, function establishing, and central and peripheral levels of this hormone is proposed. Then, the article approaches the current discussions regarding the level of reliability of the laboratory techniques that enable the measurement of oxytocin, focusing mainly on the determination of its concentration in saliva through Enzyme-Linked Immunosorbent Assay (ELISA). Finally, research results, which have established the major physiological correlates of this hormone in fields such as social neuroscience and neuropsychology, are collected and discussed in terms of the hormone measurement methods that different authors have used. In this way, the article is expected to contribute to the panorama of debates and current perspectives regarding investigation involving this important biomarker.
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Affiliation(s)
- Juan Carlos Caicedo Mera
- Laboratorio Interdisciplinar de Ciencias y Procesos Humanos LINCIPH, Facultad de Ciencias Sociales y Humanas, Universidad Externado de Colombia, Colombia
| | - Melissa Andrea Cárdenas Molano
- Laboratorio Interdisciplinar de Ciencias y Procesos Humanos LINCIPH, Facultad de Ciencias Sociales y Humanas, Universidad Externado de Colombia, Colombia
| | - Christian Camilo García López
- Laboratorio Interdisciplinar de Ciencias y Procesos Humanos LINCIPH, Facultad de Ciencias Sociales y Humanas, Universidad Externado de Colombia, Colombia
| | - Cristina Acevedo Triana
- Laboratorio Interdisciplinar de Ciencias y Procesos Humanos LINCIPH, Facultad de Ciencias Sociales y Humanas, Universidad Externado de Colombia, Colombia
| | - Jorge Martínez Cotrina
- Laboratorio Interdisciplinar de Ciencias y Procesos Humanos LINCIPH, Facultad de Ciencias Sociales y Humanas, Universidad Externado de Colombia, Colombia
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Hahn-Holbrook J, Little EE, Abbott M. Mothers are more sensitive to infant cues after breastfeeding compared to bottle-feeding with human milk. Horm Behav 2021; 136:105047. [PMID: 34710778 DOI: 10.1016/j.yhbeh.2021.105047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 08/07/2021] [Accepted: 08/11/2021] [Indexed: 11/30/2022]
Abstract
The belief that breastfeeding promotes maternal bonding is widely held by both the public and professional health organizations. Yet to our knowledge, all research examining the link between breastfeeding and maternal behavior in humans has been correlational, limiting our ability to draw causal conclusions. In many mammals, the hormone prolactin, which is central to milk production, rises in response to each breastfeeding session and promotes maternal sensitivity, yet there is a dearth of research in human mothers. To fill these research gaps, we randomly assigned 28 breastfeeding mothers to either breastfeed in the lab or feed their infants previously expressed breastmilk in a bottle before participating in a video-recorded free play session with their infant. Plasma prolactin was measured 40 min after the start of the feeding session and video observations were coded for maternal sensitivity. We found that women randomly assigned to breastfeed were more sensitive to infant cues than women randomly assigned to bottle-feed. Prolactin levels did not differ between feeding groups, although prolactin was positively correlated with maternal sensitivity. Our results suggest that feeding milk directly from the breast (compared to bottle-feeding) increases maternal sensitivity towards infants, at least in the short term.
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Affiliation(s)
- Jennifer Hahn-Holbrook
- Department of Psychology, University of California, Merced, CA, United States of America.
| | | | - Marcia Abbott
- Department of Health Sciences, Chapman University, Orange, CA, United States of America
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Rameez RM, Sadana D, Kaur S, Ahmed T, Patel J, Khan MS, Misbah S, Simonson MT, Riaz H, Ahmed HM. Association of Maternal Lactation With Diabetes and Hypertension: A Systematic Review and Meta-analysis. JAMA Netw Open 2019; 2:e1913401. [PMID: 31617928 PMCID: PMC6806428 DOI: 10.1001/jamanetworkopen.2019.13401] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
IMPORTANCE Lactation has been shown to be associated with lower rates of diabetes and hypertension in mothers. However, the strength of association has varied between studies, and sample sizes are relatively small. OBJECTIVE To conduct a systematic review and meta-analysis to determine whether lactation is associated with a lower risk of diabetes and hypertension. DATA SOURCES Ovid MEDLINE, Ovid Embase, Cochrane CENTRAL, and CINAHL databases were searched from inception to July 2018 with manual search of the references. STUDY SELECTION Studies of adult women that specified duration of breastfeeding for at least 12 months, evaluated primary hypertension and diabetes as outcomes, were full-text articles in English, and reported statistical outcomes as odds ratios were included. DATA EXTRACTION AND SYNTHESIS Study characteristics were independently extracted using a standard spreadsheet template and the data were pooled using the random-effects model. The Meta-analysis of Observational Studies in Epidemiology (MOOSE) guideline for reporting was followed. MAIN OUTCOMES AND MEASURES Diabetes and hypertension. RESULTS The search yielded 1558 articles, from which a total of 6 studies met inclusion criteria for association between breastfeeding and diabetes and/or hypertension. The 4 studies included in the meta-analysis for the association between lactation and diabetes had a total of 206 204 participants, and the 5 studies included in the meta-analysis for the association between lactation and hypertension had a total of 255 271 participants. Breastfeeding for more than 12 months was associated with a relative risk reduction of 30% for diabetes (pooled odds ratio, 0.70 [95% CI, 0.62-0.78]; P < .001) and a relative risk reduction of 13% for hypertension (pooled odds ratio, 0.87 [95% CI, 0.78-0.97]; P = .01). CONCLUSIONS AND RELEVANCE This study suggests that education about the benefits of breastfeeding for prevention of diabetes and hypertension in women is a low-risk intervention that can be easily included in daily practice and may have a positive impact on cardiovascular outcomes in mothers.
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Affiliation(s)
| | - Divyajot Sadana
- Department of Pulmonary and Critical Care Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Simrat Kaur
- Department of Internal Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Taha Ahmed
- Department of Internal Medicine, Cleveland Clinic–Fairview Hospital, Cleveland, Ohio
| | - Jay Patel
- Department of Internal Medicine, Cleveland Clinic, Cleveland, Ohio
| | - Muhammad Shahzeb Khan
- Department of Internal Medicine, John H. Stroger Jr Hospital of Cook County, Chicago, Illinois
| | | | | | - Haris Riaz
- Heart and Vascular Institute, Cleveland Clinic, Cleveland, Ohio
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Hollen R, Smith AG, Smith-Gagen J. Breastmilk Pumping for the Mental Health of the NICU Mother. CLINICAL LACTATION 2019. [DOI: 10.1891/2158-0782.10.2.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
ObjectiveWhile much is known about breastfeeding and postpartum depression, little is known about breast milk pumping's impact on postpartum depression among mothers with infants in the neonatal intensive care unit (NICU).MethodsThirty-two mothers of infants admitted to a Level III NICU between February and July 2017 were screened for postpartum depression using the Edinburgh Postnatal Depression Scale (EPDS). They were also surveyed for current breastmilk pumping activities and demographic factors. Multivariable logistic regression was used to assess the associations between postpartum depression and breast milk pumping, adjusting for confounding variables.ResultsAfter controlling for confounding variables, mothers who did not pump breast milk (relative to mothers who did) were 11 times more likely to have lower EPDS depression scores indicative of probable postpartum depression (OR = 11.7, p-value .05).ConclusionsOur results suggest a significant reduction in probable postpartum depression among NICU mothers who express breastmilk.
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Pierce ML, Mehrotra S, Mustoe AC, French JA, Murray TF. A Comparison of the Ability of Leu 8- and Pro 8-Oxytocin to Regulate Intracellular Ca 2+ and Ca 2+-Activated K + Channels at Human and Marmoset Oxytocin Receptors. Mol Pharmacol 2019; 95:376-385. [PMID: 30739093 DOI: 10.1124/mol.118.114744] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 01/30/2019] [Indexed: 02/02/2023] Open
Abstract
The neurohypophyseal hormone oxytocin (OT) regulates biologic functions in both peripheral tissues and the central nervous system. In the central nervous system, OT influences social processes, including peer relationships, maternal-infant bonding, and affiliative social relationships. In mammals, the nonapeptide OT structure is highly conserved with leucine in the eighth position (Leu8-OT). In marmosets (Callithrix), a nonsynonymous nucleotide substitution in the OXT gene codes for proline in the eighth residue position (Pro8-OT). OT binds to its cognate G protein-coupled receptor (OTR) and exerts diverse effects, including stimulation (Gs) or inhibition (Gi/o) of adenylyl cyclase, stimulation of potassium channel currents (Gi), and activation of phospholipase C (Gq). Chinese hamster ovary cells expressing marmoset or human oxytocin receptors (mOTRs or hOTRs, respectively) were used to characterize OT signaling. At the mOTR, Pro8-OT was more efficacious than Leu8-OT in measures of Gq activation, with both peptides displaying subnanomolar potencies. At the hOTR, neither the potency nor efficacy of Pro8-OT and Leu8-OT differed with respect to Gq signaling. In both mOTR- and hOTR-expressing cells, Leu8-OT was more potent and modestly more efficacious than Pro8-OT in inducing hyperpolarization. In mOTR cells, Leu8-OT-induced hyperpolarization was modestly inhibited by pretreatment with pertussis toxin (PTX), consistent with a minor role for Gi/o activation; however, the Pro8-OT response in mOTR and hOTR cells was PTX insensitive. These findings are consistent with membrane hyperpolarization being largely mediated by a Gq signaling mechanism leading to Ca2+-dependent activation of K+ channels. Evaluation of the influence of apamin, charybdotoxin, paxilline, and TRAM-34 demonstrated involvement of both intermediate and large conductance Ca2+-activated K+ channels.
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Affiliation(s)
- Marsha L Pierce
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska (M.L.P., S.M., T.F.M.); and Department of Psychology, University of Nebraska, Omaha, Nebraska (A.C.M., J.A.F.)
| | - Suneet Mehrotra
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska (M.L.P., S.M., T.F.M.); and Department of Psychology, University of Nebraska, Omaha, Nebraska (A.C.M., J.A.F.)
| | - Aaryn C Mustoe
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska (M.L.P., S.M., T.F.M.); and Department of Psychology, University of Nebraska, Omaha, Nebraska (A.C.M., J.A.F.)
| | - Jeffrey A French
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska (M.L.P., S.M., T.F.M.); and Department of Psychology, University of Nebraska, Omaha, Nebraska (A.C.M., J.A.F.)
| | - Thomas F Murray
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska (M.L.P., S.M., T.F.M.); and Department of Psychology, University of Nebraska, Omaha, Nebraska (A.C.M., J.A.F.)
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Maternal oxytocin predicts relationship survival during the perinatal transition period: Preliminary evidence. Int J Psychophysiol 2019; 136:33-38. [DOI: 10.1016/j.ijpsycho.2018.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 04/05/2018] [Accepted: 04/23/2018] [Indexed: 01/08/2023]
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Bonifacino E, Schwartz EB, Jun H, Wessel CB, Corbelli JA. Effect of Lactation on Maternal Hypertension: A Systematic Review. Breastfeed Med 2018; 13:578-588. [PMID: 30299974 DOI: 10.1089/bfm.2018.0108] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
INTRODUCTION Hypertension is relatively common in pregnancy, and pregnancy may unmask hypertension among women who are predisposed to it. Lactation may be a means through which to mitigate pregnancy-related vascular risk. The impact of lactation on maternal blood pressure, and the duration of any effect, remains unclear. This study aimed at systematically reviewing the literature evaluating the impact of lactation on the development of hypertension. MATERIALS AND METHODS We searched PubMed, including EMBASE and MEDLINE, for studies that reported on the association between breastfeeding and maternal risk of hypertension that were published in a peer-reviewed source. The quality of the studies included was assessed by using the Newcastle-Ottawa Scale. RESULTS Nineteen studies met all inclusion criteria for this review. Of the four studies with short-term follow-up, 50% showed a protective association. The fifteen studies with longer-term follow-up were stratified by outcome assessed. Sixty-seven percent of the studies that evaluated for elevated blood pressure and 100% of the studies evaluating for an outcome of hypertension showed a protective association. The minimum duration of lactation associated with a benefit was 1 month. This association was demonstrated in follow-up periods as long as two to three decades. Studies that showed a protective association had overall higher quality ratings. DISCUSSION Lactation is associated with a beneficial effect on maternal blood pressure that persists for decades. These results add to the growing body of literature demonstrating the protective association of lactation on maternal cardiovascular risk. Providers may incorporate the decreased risk of hypertension into their counseling on the maternal benefits of lactation.
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Affiliation(s)
- Eliana Bonifacino
- 1 Division of General Internal Medicine, Department of Medicine, Montefiore Hospital , Pittsburgh, Pennsylvania
| | - Eleanor B Schwartz
- 2 Division of General Internal Medicine, Department of Medicine, University of California Davis Medical Center , Sacramento, California
| | - Hyejo Jun
- 3 Health Center for Women , Saint Paul, Minnesota
| | - Charles B Wessel
- 4 Health Sciences Library System, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Jennifer A Corbelli
- 1 Division of General Internal Medicine, Department of Medicine, Montefiore Hospital , Pittsburgh, Pennsylvania
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Mother⁻Infant Physical Contact Predicts Responsive Feeding among U.S. Breastfeeding Mothers. Nutrients 2018; 10:nu10091251. [PMID: 30200623 PMCID: PMC6163497 DOI: 10.3390/nu10091251] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 08/24/2018] [Accepted: 09/04/2018] [Indexed: 12/27/2022] Open
Abstract
Responsive feeding—initiating feeding in response to early hunger cues—supports the physiology of lactation and the development of infant feeding abilities, yet there is a dearth of research examining what predicts responsive feeding. In non-Western proximal care cultures, there is an association between responsive feeding and mother–infant physical contact, but this has not been investigated within Western populations. In two studies, we tested whether mother–infant physical contact predicted feeding in response to early hunger cues versus feeding on a schedule or after signs of distress among U.S. breastfeeding mothers. With an online questionnaire in Study 1 (n = 626), physical contact with infants (via co-sleeping and babywearing) predicted increased likelihood of self-reported responsive feeding. Mothers who reported responsive feeding were more likely to exclusively breastfeed for the first six months, breastfeed more frequently throughout the day, and had a longer planned breastfeeding duration than mothers who reported feeding on a schedule or after signs of infant distress. In Study 2 (n = 96), a three-day feeding log showed that mother–infant physical contact predicted feeding in response to early hunger cues but mother–infant proximity (without physical contact) did not. In sum, our results demonstrate that physical contact with infants may shape breastfeeding behavior among U.S. mothers, highlighting a connection between social interaction and infant nutrition that warrants further investigation.
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Qu G, Wang L, Tang X, Wu W, Sun Y. Association Between Duration of Breastfeeding and Maternal Hypertension: A Systematic Review and Meta-Analysis. Breastfeed Med 2018; 13:318-326. [PMID: 29698055 DOI: 10.1089/bfm.2017.0180] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVES Recently, an increasing number of studies have implied that breastfeeding has a protective effect on maternal hypertension, but it remains controversial. The aim of this study is to evaluate the effect of breastfeeding on maternal hypertension through meta-analysis. MATERIALS AND METHODS Eligible studies were searched and identified in various databases. Meta-analysis was conducted to assess the association between the duration of breastfeeding and maternal hypertension. RESULTS Seven eligible studies that contained 444,759 participants were included in our study. Meta-analysis of these seven studies showed a significant protective effect of breastfeeding on maternal hypertension. Specifically, pooled odds ratios (ORs) of hypertension for >0-6, >6-12, and >12 months of breastfeeding were 0.92 (95% confidence interval [CI]: 0.88-0.96, I2 = 67.5%), 0.89 (95% CI: 0.86-0.92, I2 = 0), and 0.88 (95% CI: 0.84-0.93, I2 = 43.9%), respectively, compared with nonbreastfeeding mothers, and the pooled OR of hypertension was 0.93 (95% CI: 0.91-0.95, I2 = 40.8%) for women who breastfed compared with women who had not. Furthermore, the pooled hazard ratio of hypertension was 1.34 (95% CI: 1.17-1.52, I2 = 58.7%) for women who did not breastfeed compared with women who breastfed for more than 12 months for their first child. CONCLUSION Different durations of breastfeeding have different protective effects against the development of maternal hypertension, and breastfeeding for >12 months has a better effect than <12 months.
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Affiliation(s)
- Guangbo Qu
- 1 Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University , Hefei, Anhui, China
| | - Lingling Wang
- 1 Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University , Hefei, Anhui, China
| | - Xue Tang
- 1 Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University , Hefei, Anhui, China
| | - Wei Wu
- 1 Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University , Hefei, Anhui, China
| | - Yehuan Sun
- 1 Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University , Hefei, Anhui, China .,2 Center for Evidence-Based Practice, Anhui Medical University , Hefei, China
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Abstract
Anxiety disorders are among the most prevalent psychiatric disorders in youth; however, progress in treatment for childhood anxiety has stalled over the past decade. The National Institute of Mental Health (NIMH) Research Domain Criteria (RDoC) project represents a shift toward a dimensional and interdisciplinary approach to psychiatric disorders; this shift can reframe developmental psychopathology for childhood anxiety and facilitate novel advances in its classification and treatment. Here we highlight constructs in the Systems for Social Processes and the Negative Valence System domains of RDoC, as they relate to childhood anxiety disorders. Childhood anxiety relates to both RDoC domains. In terms of social processes, through natural reliance on parents to reduce children's fear, attachment represents one particular social process, which plays a central role in anxiety among youth. In terms of negative valence, considerable research links threat conditioning to pediatric anxiety. Finally, fronto-amygdala circuitry relates to all three entities, as it has been shown to underly both attachment processes and threat learning, while it also has been consistently implicated in anxiety disorders across development. Through integrative and translational approaches, RDoC provides unique opportunities and simultaneous challenges for advancing the understanding and treatment of childhood anxiety disorders.
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15
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Nguyen B, Jin K, Ding D. Breastfeeding and maternal cardiovascular risk factors and outcomes: A systematic review. PLoS One 2017; 12:e0187923. [PMID: 29186142 PMCID: PMC5706676 DOI: 10.1371/journal.pone.0187923] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 10/27/2017] [Indexed: 01/16/2023] Open
Abstract
Background There is growing evidence that breastfeeding has short- and long-term cardiovascular health benefits for mothers. The objectives of this systematic review were to examine the association between breastfeeding and maternal cardiovascular risk factors and outcomes that have not previously been synthesized systematically, including metabolic syndrome, hypertension and cardiovascular disease. Methods and findings This systematic review meets PRISMA guidelines. The MEDLINE, EMBASE and CINAHL databases were systematically searched for relevant publications of any study design from the earliest publication date to March 2016. The reference lists from selected articles were reviewed, and forward and backward referencing were conducted. The methodological quality of reviewed articles was appraised using validated checklists. Twenty-one studies meeting the inclusion criteria examined the association between self-reported breastfeeding and one or more of the following outcomes: metabolic syndrome/metabolic risk factors (n = 10), inflammatory markers/adipokines (n = 2), hypertension (n = 7), subclinical cardiovascular disease (n = 2), prevalence/incidence of cardiovascular disease (n = 3) and cardiovascular disease mortality (n = 2). Overall, 19 studies (10 cross-sectional/retrospective, 9 prospective) reported significant protective effects of breastfeeding, nine studies (3 cross-sectional/retrospective, 5 prospective, 1 cluster randomized controlled trial) reported non-significant findings and none reported detrimental effects of breastfeeding. In most studies reporting significant associations, breastfeeding remained associated with both short- and long-term maternal cardiovascular health risk factors/outcomes, even after covariate adjustment. Findings from several studies suggested that the effects of breastfeeding may diminish with age and a dose-response association between breastfeeding and several metabolic risk factors. However, further longitudinal studies, including studies that measure exclusive breastfeeding, are needed to confirm these findings. Conclusions The evidence from this review suggests that breastfeeding is associated with cardiovascular health benefits. However, results should be interpreted with caution as the evidence gathered for each individual outcome was limited by the small number of observational studies. Additional prospective studies are needed. PROSPERO registration number CRD42016047766.
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Affiliation(s)
- Binh Nguyen
- Prevention Research Collaboration, Sydney School of Public Health, Faculty of Medicine, The University of Sydney, Camperdown, New South Wales, Australia
- * E-mail:
| | - Kai Jin
- Sydney Nursing School, Charles Perkins Centre, The University of Sydney, Camperdown, New South Wales, Australia
| | - Ding Ding
- Prevention Research Collaboration, Sydney School of Public Health, Faculty of Medicine, The University of Sydney, Camperdown, New South Wales, Australia
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16
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Badr HA, Zauszniewski JA. Kangaroo care and postpartum depression: The role of oxytocin. Int J Nurs Sci 2017; 4:179-183. [PMID: 31406740 PMCID: PMC6626107 DOI: 10.1016/j.ijnss.2017.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 01/02/2017] [Accepted: 01/04/2017] [Indexed: 12/03/2022] Open
Abstract
Problem Postpartum depression occurs in about 10–22% of women after birth and adversely affects their health and the health of their newborn. Kangaroo care is known to have many health-related benefits for both the mother and her newborn. Purpose The aim of this review was to gather the evidence linking the effects of kangaroo care with postpartum depression, specifically focusing on the proposed underlying mechanism involving the release of oxytocin. Method The literature review was conducted by targeting PubMed, CINAHL, and Google Scholar databases. The search terms used were postpartum depression, postnatal depression, oxytocin, oxytocin hormone, postpartum depression, kangaroo care, and skin-to-skin contact. Results Kangaroo care was found to play an important role in decreasing the risk for postpartum depression. Skin-to-skin contact during kangaroo care was found to trigger the release of oxytocin, which is hypothesized to minimize the risk for depressive symptoms as well as decrease maternal stress. The oxytocinergic system regulates the release of oxytocin, which is an effect that is opposite that which occurs with the human stress response, in which the sympathetic nervous system is activated to release catecholamines in response to harmful or threatening stimuli. The oxytocinergic system regulates calmness, connection, and socialization processes. During kangaroo care, oxytocin blocks the stress response and decreases the circulation of catecholamines, yielding positive outcomes that include maternal stress reduction and prevention of postpartum depression. Conclusion Kangaroo care can be used as a non-pharmacological intervention to prevent or decrease the risk of postpartum depression.
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Affiliation(s)
- Hanan A Badr
- Case Western Reserve University, Frances Payne Bolton School of Nursing, 10900 Euclid Avenue, Cleveland, OH 44106-4904, USA.,King Abdul Aziz University, School of Nursing, Jeddah, P.O. Box 80200, 21589, Saudi Arabia
| | - Jaclene A Zauszniewski
- Case Western Reserve University, Frances Payne Bolton School of Nursing, 2120 Cornell Road, Cleveland, OH 44106, USA
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17
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Engert V, Koester AM, Riepenhausen A, Singer T. Boosting recovery rather than buffering reactivity: Higher stress-induced oxytocin secretion is associated with increased cortisol reactivity and faster vagal recovery after acute psychosocial stress. Psychoneuroendocrinology 2016; 74:111-120. [PMID: 27608360 DOI: 10.1016/j.psyneuen.2016.08.029] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/03/2016] [Accepted: 08/30/2016] [Indexed: 01/09/2023]
Abstract
Animal models and human studies using paradigms designed to stimulate endogenous oxytocin release suggest a stress-buffering role of oxytocin. We here examined the involvement of stress-induced peripheral oxytocin secretion in reactivity and recovery phases of the human psychosocial stress response. Healthy male and female participants (N=114) were subjected to a standardized laboratory stressor, the Trier Social Stress Test. In addition to plasma oxytocin, cortisol was assessed as a marker of hypothalamic-pituitary-adrenal (HPA-) axis activity, alpha-amylase and heart rate as markers of sympathetic activity, high frequency heart rate variability as a marker of vagal tone and self-rated anxiety as an indicator of subjective stress experience. On average, oxytocin levels increased by 51% following psychosocial stress. The stress-induced oxytocin secretion, however, did not reduce stress reactivity. To the contrary, higher oxytocin secretion was associated with greater cortisol reactivity and peak cortisol levels in both sexes. In the second phase of the stress response the opposite pattern was observed, with higher oxytocin secretion associated with faster vagal recovery. We suggest that after an early stage of oxytocin and HPA-axis co-activation, the stress-reducing action of oxytocin unfolds. Due to the time lag it manifests as a recovery-boosting rather than a reactivity-buffering effect. By reinforcing parasympathetic autonomic activity, specifically during stress recovery, oxytocin may provide an important protective function against the health-compromising effects of sustained stress.
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Affiliation(s)
- Veronika Engert
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Social Neuroscience, 04103 Leipzig, Germany.
| | - Anna M Koester
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Social Neuroscience, 04103 Leipzig, Germany
| | - Antje Riepenhausen
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Social Neuroscience, 04103 Leipzig, Germany
| | - Tania Singer
- Max Planck Institute for Human Cognitive and Brain Sciences, Department of Social Neuroscience, 04103 Leipzig, Germany
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18
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Abstract
In addition to fight-or-flight, humans demonstrate tending and befriending responses to stress—responses underpinned by the hormone oxytocin, by opioids, and by dopaminergic pathways. A working model of affiliation under stress suggests that oxytocin may be a biomarker of social distress that accompanies gaps or problems with social relationships and that may provide an impetus for affiliation. Oxytocin is implicated in the seeking of affiliative contact in response to stress, and, in conjunction with opioids, it also modulates stress responses. Specifically, in conjunction with positive affiliative contacts, oxytocin attenuates psychological and biological stress responses, but in conjunction with hostile and unsupportive contacts, oxytocin may exacerbate psychological and biological stress responses. Although significant paradoxes remain to be resolved, a mechanism that may underlie oxytocin's relation to the health benefits of social support may be in view.
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19
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Unternaehrer E, Bolten M, Nast I, Staehli S, Meyer AH, Dempster E, Hellhammer DH, Lieb R, Meinlschmidt G. Maternal adversities during pregnancy and cord blood oxytocin receptor (OXTR) DNA methylation. Soc Cogn Affect Neurosci 2016; 11:1460-70. [PMID: 27107296 DOI: 10.1093/scan/nsw051] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Accepted: 04/10/2016] [Indexed: 12/20/2022] Open
Abstract
The aim of this study was to investigate whether maternal adversities and cortisol levels during pregnancy predict cord blood DNA methylation of the oxytocin receptor (OXTR). We collected cord blood of 39 babies born to mothers participating in a cross-sectional study (N = 100) conducted in Basel, Switzerland (2007-10). Mothers completed the Inventory of Life Events (second trimester: T2), the Edinburgh Postnatal Depression Scale (EPDS, third trimester: T3), the Trier Inventory of Chronic Stress (TICS-K, 1-3 weeks postpartum) and provided saliva samples (T2, T3) for maternal cortisol profiles, as computed by the area under the curve with respect to ground (AUCg) or increase (AUCi) for the cortisol awakening response (CAR) and for diurnal cortisol profiles (DAY). OXTR DNA methylation was quantified using Sequenom EpiTYPER. The number of stressful life events (P = 0.032), EPDS score (P = 0.007) and cortisol AUCgs at T2 (CAR: P = 0.020; DAY: P = 0.024) were negatively associated with OXTR DNA methylation. Our findings suggest that distinct prenatal adversities predict decreased DNA methylation in a gene that is relevant for childbirth, maternal behavior and wellbeing of mother and offspring. If a reduced OXTR methylation increases OXTR expression, our findings could suggest an epigenetic adaptation to an adverse early environment.
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Affiliation(s)
- Eva Unternaehrer
- University of Basel, Department of Psychology, Division of Clinical Psychology and Epidemiology, 4055 Basel, Switzerland University of Basel, National Centre of Competence in Research (NCCR) Swiss Etiological Study of Adjustment and Mental Health (sesam), 4055 Basel, Switzerland Douglas Mental Health University Institute, McGill University, 6875 La Salle Boulevard, Montreal, QC H4H 1R3, Canada
| | - Margarete Bolten
- University of Basel, Child and Adolescent Psychiatric Hospital, 4058 Basel, Switzerland Ludwig-Maximilians-University Munich, Department of Psychology, 80802 Munich, Germany
| | - Irina Nast
- University of Basel, National Centre of Competence in Research (NCCR) Swiss Etiological Study of Adjustment and Mental Health (sesam), 4055 Basel, Switzerland Zurich University of Applied Sciences, School of Health Professions, 8401 Winterthur, Switzerland
| | - Simon Staehli
- University of Trier, Institute of Psychobiology, 54296 Trier, Germany
| | - Andrea H Meyer
- University of Basel, Department of Psychology, Division of Clinical Psychology and Epidemiology, 4055 Basel, Switzerland
| | - Emma Dempster
- University of Exeter Medical School, Exeter EX1 2LU, UK
| | | | - Roselind Lieb
- University of Basel, Department of Psychology, Division of Clinical Psychology and Epidemiology, 4055 Basel, Switzerland University of Basel, National Centre of Competence in Research (NCCR) Swiss Etiological Study of Adjustment and Mental Health (sesam), 4055 Basel, Switzerland
| | - Gunther Meinlschmidt
- University of Basel, Department of Psychology, Division of Clinical Psychology and Epidemiology, 4055 Basel, Switzerland University of Basel, National Centre of Competence in Research (NCCR) Swiss Etiological Study of Adjustment and Mental Health (sesam), 4055 Basel, Switzerland Ruhr-University Bochum, Faculty of Medicine, Universitaetsstrasse 150, 44801 Bochum, Germany
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20
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Bhaskara B, Dayananda VP, Kannan S, Raghavendra Rao RS, Ramachandraiah R. Effect of breastfeeding on haemodynamics and consumption of propofol and sevoflurane: A state entropy guided comparative study. Indian J Anaesth 2016; 60:180-6. [PMID: 27053781 PMCID: PMC4800934 DOI: 10.4103/0019-5049.177865] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background and Aims: Unique post-partum endocrine hormone oxytocin secreted during breastfeeding (BF) has amnestic, sedative properties and down-regulates stress responses. This study was done to assess the effect of BF on consumption of propofol, sevoflurane and haemodynamic stability in women. Methods: Study was conducted on 120 women aged 20–30 years of American Society of Anesthesiologists I and II physical status scheduled for tubectomy under general anaesthesia who were randomly allocated to three groups 40 of each; BF, withhold feeding (WF), and non-feeding (NF) groups. All received standard premedication. Heart rate (HR), mean arterial pressure (MAP) and state entropy (SE) values were recorded at regular intervals. All patients were induced with intravenous propofol until the SE levels dropped to 45, and dose of propofol recorded. Airway was secured with laryngeal mask airway and anaesthesia was maintained with sevoflurane in 60% N2O and O2. Sevoflurane concentration was adjusted to maintain SE between 40 and 60. End tidal concentration of sevoflurane and consumption of sevoflurane (ml) was recorded by GE Datex-Ohmeda S/5™ System. Results were analysed by analysis of variance and Chi-square test. Results: Demographic parameters were comparable. Dose of propofol and sevoflurane consumption in group BF was significantly reduced by 20% and 35%, respectively (P < 0.05) compared to group NF. Intra-operative HR and MAP were persistently low in group BF and elevated in group WF (P < 0.05). Conclusion: BF before induction of anaesthesia decreases the consumption of propofol, sevoflurane and maintains the intra-operative haemodynamic stability, whereas withholding BF increases propofol and sevoflurane consumption with intra-operative higher HR and MAP, compared to control group.
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Affiliation(s)
- B Bhaskara
- Department of Anaesthesiology, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India
| | - V P Dayananda
- Department of Anaesthesiology, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India
| | - Sudheesh Kannan
- Department of Anaesthesiology, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India
| | - R S Raghavendra Rao
- Department of Anaesthesiology, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India
| | - R Ramachandraiah
- Department of Anaesthesiology, Bangalore Medical College and Research Institute, Bengaluru, Karnataka, India
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21
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Ellingsen DM, Leknes S, Løseth G, Wessberg J, Olausson H. The Neurobiology Shaping Affective Touch: Expectation, Motivation, and Meaning in the Multisensory Context. Front Psychol 2016; 6:1986. [PMID: 26779092 PMCID: PMC4701942 DOI: 10.3389/fpsyg.2015.01986] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 12/12/2015] [Indexed: 01/01/2023] Open
Abstract
Inter-individual touch can be a desirable reward that can both relieve negative affect and evoke strong feelings of pleasure. However, if other sensory cues indicate it is undesirable to interact with the toucher, the affective experience of the same touch may be flipped to disgust. While a broad literature has addressed, on one hand the neurophysiological basis of ascending touch pathways, and on the other hand the central neurochemistry involved in touch behaviors, investigations of how external context and internal state shapes the hedonic value of touch have only recently emerged. Here, we review the psychological and neurobiological mechanisms responsible for the integration of tactile “bottom–up” stimuli and “top–down” information into affective touch experiences. We highlight the reciprocal influences between gentle touch and contextual information, and consider how, and at which levels of neural processing, top-down influences may modulate ascending touch signals. Finally, we discuss the central neurochemistry, specifically the μ-opioids and oxytocin systems, involved in affective touch processing, and how the functions of these neurotransmitters largely depend on the context and motivational state of the individual.
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Affiliation(s)
- Dan-Mikael Ellingsen
- MGH/HST Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical SchoolBoston, MA, USA; Department of Psychology, University of OsloOslo, Norway
| | - Siri Leknes
- Department of Psychology, University of Oslo Oslo, Norway
| | - Guro Løseth
- Department of Psychology, University of Oslo Oslo, Norway
| | - Johan Wessberg
- Institute of Neuroscience and Physiology, University of Gothenburg Gothenburg, Sweden
| | - Håkan Olausson
- Department of Clinical and Experimental Medicine, Linköping University Linköping, Sweden
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22
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Jonas W, Woodside B. Physiological mechanisms, behavioral and psychological factors influencing the transfer of milk from mothers to their young. Horm Behav 2016; 77:167-81. [PMID: 26232032 DOI: 10.1016/j.yhbeh.2015.07.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 07/12/2015] [Accepted: 07/23/2015] [Indexed: 12/13/2022]
Abstract
This article is part of a Special Issue "Parental Care".Producing milk to support the growth of their young is a central element of maternal care in mammals. In spite of the facts that ecological constraints influence nursing frequency, length of time until weaning and the composition of milk, there is considerable similarity in the anatomy and physiology of milk production and delivery across mammalian species. Here we provide an overview of cross species variation in nursing patterns and milk composition as well as the mechanisms underlying mammary gland development, milk production and letdown. Not all women breastfeed their infants, thus in later sections we review studies of factors that facilitate or impede the initiation and duration of breastfeeding. The results of these investigations suggest that the decisions to initiate and maintain breastfeeding are influenced by an array of personal, social and biological factors. Finally, studies comparing the development of breastfed and formula fed infants as well as those investigating associations between breastfeeding, maternal health and mother/infant interaction are reviewed. Leading health agencies including the World Health Organization and CDC advocate breastfeeding for at least the first 6months postpartum. To achieve these rates will require not only institutional support but also a focus on individual mother/infant dyads and their experience.
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Affiliation(s)
- Wibke Jonas
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden; Fraser Mustard Institute of Human Development, University of Toronto, Toronto, Canada
| | - Barbara Woodside
- Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, QC, Canada.
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23
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Mileva-Seitz VR, Bakermans-Kranenburg MJ, van IJzendoorn MH. Genetic mechanisms of parenting. Horm Behav 2016; 77:211-23. [PMID: 26112881 DOI: 10.1016/j.yhbeh.2015.06.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 02/07/2023]
Abstract
This article is part of a Special Issue "Parental Care". The complexities of parenting behavior in humans have been studied for decades. Only recently did we begin to probe the genetic and epigenetic mechanisms underlying these complexities. Much of the research in this field continues to be informed by animal studies, where genetic manipulations and invasive tools allow to peek into and directly observe the brain during the expression of maternal behavior. In humans, studies of adult twins who are parents can suggest dimensions of parenting that might be more amenable to a genetic influence. Candidate gene studies can test specific genes in association with parental behavior based on prior knowledge of those genes' function. Gene-by-environment interactions of a specific kind indicating differential susceptibility to the environment might explain why some parents are more resilient and others are more vulnerable to stressful life events. Epigenetic studies can provide the bridge often necessary to explain why some individuals behave differently from others despite common genetic influences. There is a much-needed expansion in parenting research to include not only mothers as the focus-as has been the case almost exclusively to date-but also fathers, grandparents, and other caregivers.
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Affiliation(s)
- Viara R Mileva-Seitz
- Center for Child and Family Studies, Leiden University, PO Box 9555, 2300 RB Leiden, The Netherlands; Department of Child and Adolescent Psychiatry/Psychology, Erasmus University Medical Center, PO Box 2060, 3000 CB Rotterdam, The Netherlands.
| | | | - Marinus H van IJzendoorn
- Center for Child and Family Studies, Leiden University, PO Box 9555, 2300 RB Leiden, The Netherlands; School of Pedagogical and Educational Sciences, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands
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24
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Gunderson EP, Quesenberry CP, Ning X, Jacobs DR, Gross M, Goff DC, Pletcher MJ, Lewis CE. Lactation Duration and Midlife Atherosclerosis. Obstet Gynecol 2015; 126:381-390. [PMID: 26241429 PMCID: PMC5193138 DOI: 10.1097/aog.0000000000000919] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To evaluate lactation duration in relation to subsequent atherosclerosis in women during midlife. METHODS The Coronary Artery Risk Development in Young Adults study is a multicenter prospective cohort that enrolled 2,787 women in 1985-1986 (ages 18-30 years, 52% black, 48% white), of whom 2,014 (72%) attended the 20-year follow-up examination in 2005-2006. We selected 846 women (46% black) without heart disease or diabetes at baseline who delivered one or more times after the baseline evaluation, had cardiometabolic risk factors measured at baseline, and had maximum common carotid intima-media thickness (mm) measured at the 20-year follow-up examination in 2005-2006. Lactation duration was summed across all postbaseline births for each woman and (n, women) categorized as: 0 to less than 1 month (n=262), 1 to less than 6 months (n=210), 6 to less than 10 months (n=169), and 10 months or greater (n=205). Multiple linear regression models estimated mean common carotid intima-media thickness (95% confidence interval) and mean differences among lactation duration groups compared with the 0 to less than 1-month group adjusted for prepregnancy obesity, cardiometabolic status, parity, and other risk factors. RESULTS Lactation duration had a graded inverse association with common carotid intima-media thickness; mean differences between 10 months or greater compared with 0 to less than 1 month ranged from -0.062 mm for unadjusted models (P trend <.001) to -0.029 mm for models fully adjusted for prepregnancy body mass index (BMI) and cardiometabolic risk factors, parity, smoking, and sociodemographics (P trend=.010). Stepwise addition of potential mediators (BMI, systolic blood pressure at the 20-year follow-up examination) modestly attenuated the lactation and common carotid intima-media thickness association to -0.027 and -0.023 mm (P trend=.019 and .054). CONCLUSION Shorter lactation duration is associated with subclinical atherosclerosis independent of prepregnancy cardiometabolic risk factors and traditional risk factors. The magnitude of differences in carotid artery intima-media thickness may represent greater vascular aging. Lactation may have long-term benefits that lower cardiovascular disease risk in women. LEVEL OF EVIDENCE II.
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Affiliation(s)
- Erica P. Gunderson
- Division of Research, Kaiser Permanente Northern California, Oakland, CA
| | | | - Xian Ning
- Division of Research, Kaiser Permanente Northern California, Oakland, CA
| | - David R. Jacobs
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN
| | - Myron Gross
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN
| | - David C. Goff
- Colorado School of Public Health, University of Colorado Denver, Aurora, CO
| | - Mark J. Pletcher
- Department of Epidemiology and Biostatistics, University of California, San Francisco, CA
| | - Cora E. Lewis
- Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, AL
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25
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Jonas W, Atkinson L, Steiner M, Meaney MJ, Wazana A, Fleming AS. Breastfeeding and maternal sensitivity predict early infant temperament. Acta Paediatr 2015; 104:678-86. [PMID: 25727570 DOI: 10.1111/apa.12987] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 02/24/2015] [Indexed: 11/29/2022]
Abstract
AIM Research findings are inconclusive when it comes to whether breastfeeding is associated with the mother-infant relationship or infant temperament. We examined the association between breastfeeding at three months postpartum and infant temperament at 18 months postpartum and whether this link was affected by the mothers' anxiety and mediated by her sensitivity. METHODS We assessed 170 mothers for breastfeeding and anxiety using the Spielberger State-Trait Anxiety Inventory (STAI) at three months postpartum, maternal sensitivity using the Ainsworth Sensitivity Scale at six months postpartum and infant temperament using the Early Childhood Behaviour Questionnaire at 18 months postpartum. RESULTS Mothers who breastfed at three months postpartum were more sensitive in their interactions with their infants at six months postpartum, and elevated sensitivity, in turn, predicted reduced levels of negative affectivity in infant temperament at 18 months postpartum. This indirect mediation persisted after controlling for confounders (effect ab = -0.0312 [0.0208], 95% CI = -0.0884 to -0.0031). A subsequent analysis showed that the mediation through sensitivity only occurred in women experiencing higher anxiety, with a STAI score ≥33.56 at three months (ab = -0.0250 [0.0179], 95% CI = -0.0759 to -0.0013). CONCLUSION Our results suggest that breastfeeding and maternal sensitivity may have a positive impact on the early development of infant temperament.
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Affiliation(s)
- Wibke Jonas
- Department of Psychology; University of Toronto; Toronto ON Canada
- Department of Women's and Children's Health; Karolinska Institute; Stockholm Sweden
| | - Leslie Atkinson
- Department of Psychology; Ryerson University; Toronto ON Canada
| | - Meir Steiner
- Women's Health Concerns Clinic; St. Joseph's Healthcare; Hamilton ON Canada
- Department of Psychiatry & Behavioural Neurosciences and Obstetrics & Gynecology; McMaster University; Hamilton ON Canada
| | | | - Ashley Wazana
- Department of Psychiatry; Centre for Child Development and Mental Health; Jewish General Hospital; Montreal QC Canada
| | - Alison S. Fleming
- Department of Psychology; University of Toronto; Toronto ON Canada
- Fraser Mustard Institute for Human Development; University of Toronto; Toronto ON Canada
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Zhang BZ, Zhang HY, Liu HH, Li HJ, Wang JS. Breastfeeding and maternal hypertension and diabetes: a population-based cross-sectional study. Breastfeed Med 2015; 10:163-7. [PMID: 25785993 PMCID: PMC4378660 DOI: 10.1089/bfm.2014.0116] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study aimed to assess the association of breastfeeding and maternal hypertension and diabetes in Beijing, China. SUBJECTS AND METHODS A cross-sectional study was conducted in four urban communities of Beijing, China, with 9,128 parous women 40-81 years of age who had had only one lifetime birth. Each participant completed a detailed survey and accepted blood pressure measurement and blood glucose testing. Moreover, self-reported hypertension and diabetes were confirmed by review of medical records. RESULTS After the analysis was adjusted for the potential confounders, including age, body mass index (BMI), waist to hip ratio (WHR), working status, educational level, drinking, smoking, family history of hypertension, age of menarche, menopause, oral contraceptive use, age of child-bearing, and postpartum BMI, the odd ratio (OR) of hypertension was 1.18 (95% confidence interval [CI], 1.05-1.32) for women who did not breastfeed, compared with women who did. In addition, the ORs for >0 to 6 months, >6 to 12 months, and >12 months of breastfeeding were 0.87 (95% CI, 0.76-0.99), 0.83 (95% CI, 0.68-1.00), and 0.79 (95% CI, 0.65-0.97), respectively, compared with women who did not breastfeed. With adjustment for age, WHR, working status, educational level, family history of diabetes, and postpartum BMI, women who did not breastfeed increased the risk of diabetes (OR=1.30; 95% CI, 1.11-1.53) compared with women who did. Moreover, women who breastfed for >0 to 6 months (OR=0.81; 95% CI, 0.67-0.98) and >6 to 12 months (OR=0.46; 95% CI, 0.26-0.84) had a lower risk of diabetes, compared with women who did not breastfeed. CONCLUSIONS Chinese mothers who did not breastfeed were more likely to develop hypertension and diabetes in later life.
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Affiliation(s)
- Bing-Zhen Zhang
- Institute of Chronic Disease, Peking University Shougang Hospital , Beijing, People's Republic of China
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Groer MW, Jevitt CM, Sahebzamani F, Beckstead JW, Keefe DL. Breastfeeding status and maternal cardiovascular variables across the postpartum. J Womens Health (Larchmt) 2014; 22:453-9. [PMID: 23659484 DOI: 10.1089/jwh.2012.3981] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND There have been recent reports that lactational history is associated with long-term women's health benefits. Most of these studies are epidemiological. If particular cardiometabolic changes that occur during lactation ultimately influence women's health later is unknown. METHODS Seventy-one healthy women participated in a prospective postpartum study that provided an opportunity to study anthropometric, endocrine, immune, and behavioral variables across time. Variables studied were heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), C-reactive protein, body mass index (BMI), perceived stress, and hormones. A cohort of women without a change in breastfeeding (N=22) or formula feeding (N=23) group membership for 5 months was used for analysis of effects of feeding status. The data were analyzed using factorial repeated measures analysis of variance and analysis of covariance. RESULTS SBP and HR declined across the postpartum and were significantly lower in breastfeeding compared to formula feeding mothers (p<0.05). These differences remained statistically significant when BMI was added to the model. Other covariates of income, stress, marital status, and ethnicity were not significantly associated with these variables over time. DBP was also lower, but the significance was reduced by the addition of BMI as a covariate. Stress also was lower in breastfeeders, but this effect was reduced by the addition of income as a covariate. CONCLUSIONS These data suggest that there are important physiological differences in women during months of breastfeeding. These may have roles in influencing or programming later risks for a number of midlife diseases.
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Affiliation(s)
- Maureen W Groer
- University of South Florida Colleges of Nursing and Medicine, Tampa, Florida 33612, USA.
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Swain JE, Kim P, Spicer J, Ho SS, Dayton CJ, Elmadih A, Abel KM. Approaching the biology of human parental attachment: brain imaging, oxytocin and coordinated assessments of mothers and fathers. Brain Res 2014; 1580:78-101. [PMID: 24637261 PMCID: PMC4157077 DOI: 10.1016/j.brainres.2014.03.007] [Citation(s) in RCA: 201] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 02/11/2014] [Accepted: 03/07/2014] [Indexed: 12/30/2022]
Abstract
Brain networks that govern parental response to infant signals have been studied with imaging techniques over the last 15 years. The complex interaction of thoughts and behaviors required for sensitive parenting enables the formation of each individual's first social bonds and critically shapes development. This review concentrates on magnetic resonance imaging experiments which directly examine the brain systems involved in parental responses to infant cues. First, we introduce themes in the literature on parental brain circuits studied to date. Next, we present a thorough chronological review of state-of-the-art fMRI studies that probe the parental brain with a range of baby audio and visual stimuli. We also highlight the putative role of oxytocin and effects of psychopathology, as well as the most recent work on the paternal brain. Taken together, a new model emerges in which we propose that cortico-limbic networks interact to support parental brain responses to infants. These include circuitry for arousal/salience/motivation/reward, reflexive/instrumental caring, emotion response/regulation and integrative/complex cognitive processing. Maternal sensitivity and the quality of caregiving behavior are likely determined by the responsiveness of these circuits during early parent-infant experiences. The function of these circuits is modifiable by current and early-life experiences, hormonal and other factors. Severe deviation from the range of normal function in these systems is particularly associated with (maternal) mental illnesses - commonly, depression and anxiety, but also schizophrenia and bipolar disorder. Finally, we discuss the limits and extent to which brain imaging may broaden our understanding of the parental brain given our current model. Developments in the understanding of the parental brain may have profound implications for long-term outcomes in families across risk, resilience and possible interventions. This article is part of a Special Issue entitled Oxytocin and Social Behav.
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Affiliation(s)
- J E Swain
- Department of Psychiatry, University of Michigan, USA; Center for Human Growth and Development, University of Michigan, USA; Department of Psychology, University of Michigan, USA.
| | - P Kim
- Department of Psychology, University of Denver, USA
| | - J Spicer
- Department of Psychiatry, Columbia University, USA
| | - S S Ho
- Department of Psychiatry, University of Michigan, USA
| | - C J Dayton
- Department of Psychiatry, University of Michigan, USA; School of Social Work, Wayne State University, USA
| | - A Elmadih
- Centre for Women׳s Mental Health, Institute of Brain Behaviour and Mental Health, Manchester Academic Health Sciences Centre, University of Manchester, UK
| | - K M Abel
- Centre for Women׳s Mental Health, Institute of Brain Behaviour and Mental Health, Manchester Academic Health Sciences Centre, University of Manchester, UK
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Hostinar CE, Sullivan RM, Gunnar MR. Psychobiological mechanisms underlying the social buffering of the hypothalamic-pituitary-adrenocortical axis: a review of animal models and human studies across development. Psychol Bull 2014; 140:256-282. [PMID: 23607429 PMCID: PMC3844011 DOI: 10.1037/a0032671 10.1037/a0032671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Discovering the stress-buffering effects of social relationships has been one of the major findings in psychobiology in the last century. However, an understanding of the underlying neurobiological and psychological mechanisms of this buffering is only beginning to emerge. An important avenue of this research concerns the neurocircuitry that can regulate the activity of the hypothalamic-pituitary-adrenocortical (HPA) axis. The present review is a translational effort aimed at integrating animal models and human studies of the social regulation of the HPA axis from infancy to adulthood, specifically focusing on the process that has been named social buffering. This process has been noted across species and consists of a dampened HPA axis stress response to threat or challenge that occurs with the presence or assistance of a conspecific. We describe aspects of the relevant underlying neurobiology when enough information exists and expose major gaps in our understanding across all domains of the literatures we aimed to integrate. We provide a working conceptual model focused on the role of oxytocinergic systems and prefrontal neural networks as 2 of the putative biological mediators of this process, and propose that the role of early experiences is critical in shaping later social buffering effects. This synthesis points to both general future directions and specific experiments that need to be conducted to build a more comprehensive model of the HPA social buffering effect across the life span that incorporates multiple levels of analysis: neuroendocrine, behavioral, and social.
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Affiliation(s)
| | - Regina M Sullivan
- Emotional Brain Institute, Nathan S. Kline Institute, Department of Child and Adolescent Psychiatry, New York University Langone Medical Center
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30
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Rudzik AEF, Breakey A, Bribiescas RG. Oxytocin and Epstein-Barr virus: Stress biomarkers in the postpartum period among first-time mothers from São Paulo, Brazil. Am J Hum Biol 2013; 26:43-50. [PMID: 24265252 DOI: 10.1002/ajhb.22489] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Revised: 10/06/2013] [Accepted: 11/06/2013] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES The purpose of the study was to examine the relationship between self-reported stress levels among new mothers in São Paulo, Brazil and two biomarkers of stressful experience, oxytocin (OT) and Epstein-Barr Virus antibody level (EBV-ab), with planned pregnancy hypothesized as a moderator of biological response to stressful conditions. METHODS Sixty-three first-time mothers between the ages of 15 and 45 were recruited from neighborhoods in São Paulo, Brazil. Quantitative and qualitative data were collected longitudinally, bi-weekly between two and 12 weeks postpartum. OT level was assessed from breast milk samples and EBV-ab from blood spot samples. An Interpersonal Satisfaction scale was developed, validated, and administered, along with the Cohen perceived stress scale (PSS). RESULTS In-depth interview data revealed unplanned pregnancy to be a significant stressor in the lives of first-time mothers. In linear regression, OT level was negatively associated with interpersonal satisfaction score (P = 0.022) and positively associated with PSS score (P = 0.007). When splitting the sample by planned status of the pregnancy, women with an unplanned pregnancy showed a strengthened positive association between OT level and PSS (P = 0.001; Adj R(2) = 0.44) and negative association with interpersonal satisfaction (P = 0.017; Adj R(2) = 0.15), while no associations existed for women with a planned pregnancy. EBV-ab level was not correlated or associated with stress/satisfaction measures. CONCLUSION OT is an effective biomarker in the measurement of stress in the body, and additionally reflects differential experiences with difficult interpersonal circumstances, such as unplanned pregnancy. By contrast, EBV-ab failed to reflect differences in self-reported stress levels between mothers.
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Affiliation(s)
- Alanna E F Rudzik
- Department of Anthropology, Durham University, Durham, DH1 3LE, United Kingdom
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31
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Natland Fagerhaug T, Forsmo S, Jacobsen GW, Midthjell K, Andersen LF, Ivar Lund Nilsen T. A prospective population-based cohort study of lactation and cardiovascular disease mortality: the HUNT study. BMC Public Health 2013; 13:1070. [PMID: 24219620 PMCID: PMC3840666 DOI: 10.1186/1471-2458-13-1070] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 11/05/2013] [Indexed: 12/02/2022] Open
Abstract
Background Recent studies suggest that lactation has long-term effects on risk for cardiovascular disease in women, but the effects on cardiovascular mortality are less well known. Method In a Norwegian population-based prospective cohort study, we studied the association of lifetime duration of lactation with cardiovascular mortality in 21,889 women aged 30 to 85 years who attended the second Nord-Trøndelag Health Survey (HUNT2) in 1995–1997. The cohort was followed for mortality through 2010 by a linkage with the Cause of Death Registry. Adjusted hazard ratios (HR) for death from all causes and cardiovascular disease were calculated using Cox regression. Results During follow-up, 1,246 women died from cardiovascular disease. Parous women younger than 65 years who had never lactated had a higher cardiovascular mortality than the reference group of women who had lactated 24 months or more (HR 2.77, 95% confidence interval [CI]: 1.28, 5.99). There was some evidence of a U-shaped association, where women who reported lactating 7–12 months had a HR of 0.55 (95% CI: 0.27, 1.09). No clear associations were observed among women 65 years or older. Conclusions Excess cardiovascular mortality rates were observed among parous women younger than 65 years who had never lactated. These findings support the hypothesis that lactation may have long-term influences on maternal cardiovascular health.
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Affiliation(s)
- Tone Natland Fagerhaug
- Department of Public Health and General Practice, Norwegian University of Science and Technology, PO Box 8904 MTFS, 7491 Trondheim, Norway.
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Oken E, Patel R, Guthrie LB, Vilchuck K, Bogdanovich N, Sergeichick N, Palmer TM, Kramer MS, Martin RM. Effects of an intervention to promote breastfeeding on maternal adiposity and blood pressure at 11.5 y postpartum: results from the Promotion of Breastfeeding Intervention Trial, a cluster-randomized controlled trial. Am J Clin Nutr 2013; 98:1048-56. [PMID: 23945719 PMCID: PMC3778859 DOI: 10.3945/ajcn.113.065300] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/09/2013] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Differences between mothers who do and do not succeed in breastfeeding are likely to confound associations of lactation with later maternal adiposity. OBJECTIVE We compared adiposity and blood pressure (BP) in women randomly assigned to an intervention to promote prolonged and exclusive breastfeeding or usual care. DESIGN We performed a cluster-randomized trial at 31 hospitals in Belarus in 1996-1997. RESULTS Of 17,046 women enrolled at delivery, we assessed 11,867 women (69.6%) at 11.5 y postpartum. The prevalence of exclusive breastfeeding ≥3 mo was 44.5% in 6321 women in the intervention group and 7.1% in 5546 women in the control group. At 11.5 y postpartum, mean (±SD) body mass index (BMI; in kg/m(2)) was 26.5 ± 5.5, the percentage of body fat was 33.6% ± 8.3%, and systolic BP was 124.6 ± 14.6 mm Hg. On intention-to-treat analysis (without imputation) with adjustment for clustering by hospital, mean outcomes were lower in intervention compared with control mothers for BMI (mean difference: -0.27; 95% CI: -0.91, 0.37), body fat (-0.49%; 95% CI: -1.25%, 0.27%), and systolic BP (-0.81 mm Hg; 95% CI: -3.33, 1.71 mm Hg), but effect sizes were small, CIs were wide, and results were attenuated further toward the null after adjustment for baseline characteristics. Results were similar in sensitivity analyses [ie, by using conventional observational analyses disregarding treatment assignment, instrumental variable analyses to estimate the causal effect of breastfeeding, and multiple imputation to account for missing outcome measures (n = 17,046)]. CONCLUSION In women who initiated breastfeeding, an intervention to promote longer breastfeeding duration did not result in an important lowering of adiposity or BP. This trial was registered at clinicaltrials.gov as NCT01561612 and at Current Controlled Trials as ISRCTN37687716.
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Affiliation(s)
- Emily Oken
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA and the Medical Research Council/University of Bristol Integrated Epidemiology Unit, University of Bristol, Bristol, United Kingdom
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Hahn-Holbrook J, Haselton MG, Dunkel Schetter C, Glynn LM. Does breastfeeding offer protection against maternal depressive symptomatology?: A prospective study from pregnancy to 2 years after birth. Arch Womens Ment Health 2013; 16:411-22. [PMID: 23749095 PMCID: PMC3818091 DOI: 10.1007/s00737-013-0348-9] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 03/27/2013] [Indexed: 11/29/2022]
Abstract
Mothers who breastfeed typically exhibit lower levels of depressive symptomatology than mothers who do not. However, very few studies have investigated the directionality of this relationship. Of the prospective studies published, all but one focus exclusively on whether maternal depression reduces rates of subsequent breastfeeding. This study again examines this relationship, but also the reverse-that breastfeeding might predict lower levels of later depression. Using multilevel modeling, we investigated the relationship between breastfeeding and self-reported depressive symptomatology in 205 women followed prenatally and at 3, 6, 12, and 24 months after birth. Consistent with previous research, women with prenatal depressive symptomatology weaned their infants 2.3 months earlier, on average, than women without such symptomatology. We also found, however, that women who breastfed more frequently at 3 months postpartum showed greater subsequent declines in depressive symptomatology over time compared to women who breastfed less frequently, resulting in lower absolute levels of depressive symptoms by 24 months postpartum, controlling for important confounds. In sum, these findings are consistent with a bidirectional association between breastfeeding and depression, with prenatal depression predicting less breastfeeding soon after birth and breastfeeding predicting declines in maternal depression up to 2 years after birth. We discuss mechanisms that could potentially explain these associations and avenues for future research.
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Affiliation(s)
- Jennifer Hahn-Holbrook
- Department of Psychology and the Institute for Society and Genetics, University of California, Los Angeles, Los Angeles, CA, USA,
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34
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Hostinar CE, Sullivan RM, Gunnar MR. Psychobiological mechanisms underlying the social buffering of the hypothalamic-pituitary-adrenocortical axis: a review of animal models and human studies across development. Psychol Bull 2013; 140:256-82. [PMID: 23607429 DOI: 10.1037/a0032671] [Citation(s) in RCA: 436] [Impact Index Per Article: 39.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Discovering the stress-buffering effects of social relationships has been one of the major findings in psychobiology in the last century. However, an understanding of the underlying neurobiological and psychological mechanisms of this buffering is only beginning to emerge. An important avenue of this research concerns the neurocircuitry that can regulate the activity of the hypothalamic-pituitary-adrenocortical (HPA) axis. The present review is a translational effort aimed at integrating animal models and human studies of the social regulation of the HPA axis from infancy to adulthood, specifically focusing on the process that has been named social buffering. This process has been noted across species and consists of a dampened HPA axis stress response to threat or challenge that occurs with the presence or assistance of a conspecific. We describe aspects of the relevant underlying neurobiology when enough information exists and expose major gaps in our understanding across all domains of the literatures we aimed to integrate. We provide a working conceptual model focused on the role of oxytocinergic systems and prefrontal neural networks as 2 of the putative biological mediators of this process, and propose that the role of early experiences is critical in shaping later social buffering effects. This synthesis points to both general future directions and specific experiments that need to be conducted to build a more comprehensive model of the HPA social buffering effect across the life span that incorporates multiple levels of analysis: neuroendocrine, behavioral, and social.
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Affiliation(s)
| | - Regina M Sullivan
- Emotional Brain Institute, Nathan S. Kline Institute, Department of Child and Adolescent Psychiatry, New York University Langone Medical Center
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35
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Burkett JP, Young LJ. The behavioral, anatomical and pharmacological parallels between social attachment, love and addiction. Psychopharmacology (Berl) 2012; 224:1-26. [PMID: 22885871 PMCID: PMC3469771 DOI: 10.1007/s00213-012-2794-x] [Citation(s) in RCA: 138] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Accepted: 06/26/2012] [Indexed: 01/31/2023]
Abstract
RATIONALE Love has long been referred to as an addiction in literature and poetry. Scientists have often made comparisons between social attachment processes and drug addiction, and it has been suggested that the two may share a common neurobiological mechanism. Brain systems that evolved to govern attachments between parents and children and between monogamous partners may be the targets of drugs of abuse and serve as the basis for addiction processes. OBJECTIVES Here, we review research on drug addiction in parallel with research on social attachments, including parent-offspring attachments and social bonds between mating partners. This review focuses on the brain regions and neurochemicals with the greatest overlap between addiction and attachment and, in particular, the mesolimbic dopamine (DA) pathway. RESULTS Significant overlap exists between these two behavioral processes. In addition to conceptual overlap in symptomatology, there is a strong commonality between the two domains regarding the roles and sites of action of DA, opioids, and corticotropin-releasing factor. The neuropeptides oxytocin and vasopressin are hypothesized to integrate social information into attachment processes that is not present in drug addiction. CONCLUSIONS Social attachment may be understood as a behavioral addiction, whereby the subject becomes addicted to another individual and the cues that predict social reward. Understandings from both fields may enlighten future research on addiction and attachment processes.
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Affiliation(s)
- James P Burkett
- Center for Translational Social Neuroscience, Division of Behavioral Neuroscience and Psychiatric Disorders, Department of Psychiatry and Behavioral Sciences, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road, Atlanta, GA 30329, USA.
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Abstract
BACKGROUND The suggestion that the neurohormone oxytocin may have clinical application in the treatment of schizophrenia was first published in 1972. Since then, a considerable body of research on a variety of fronts--including several recent double-blind treatment trials-has buttressed these early reports, providing support for the assertion that the oxytocin system is a promising and novel therapeutic target for this devastating malady. Herein, we review the diverse, convergent lines of evidence supporting the therapeutic potential of oxytocin in psychotic illness. METHODS We performed a systematic review of preclinical and clinical literature pertaining to oxytocin's role in schizophrenia. RESULTS Multiple lines of evidence converge to support the antipsychotic potential of oxytocin. These include several animal models of schizophrenia, pharmacological studies examining the impact of antipsychotics on the oxytocin system, human trials in patients examining aspects of the oxytocin system, and several double-blind, placebo-controlled clinical treatment trials. CONCLUSIONS There exists considerable, convergent evidence that oxytocin has potential as a novel antipsychotic with a unique mechanism of action. Auspiciously, based on the few chronic trials to date, its safety profile and tolerability appear very good. That said, several critical clinical questions await investigation before widespread use is clinically warranted.
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Affiliation(s)
- Kai Macdonald
- University of California, San Diego Medical Center Department of Psychiatry
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Abstract
Maternal mental health is an important public health issue because of its effects not only on the mother's well-being and functional status, but also her relationship with her partner and the development of her children. There is accumulating evidence of the adverse sequelae of maternal anxiety on fetal development, obstetrical complications, pregnancy outcomes such as low birth weight, and subsequent child development. Evaluation of maternal anxiety and intervention to reduce these symptoms, may ensure optimal developmental outcomes, particularly in high-risk infants such as those born at very low birth weights. This article will outline recent advances in our understanding of the etiology, assessment and impact of maternal anxiety, and describe intervention strategies to promote maternal well-being.
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Affiliation(s)
- Phyllis Zelkowitz
- Department of Psychiatry, Jewish General Hospital & McGill University, Lady Davis Institute, Jewish General Hospital, QC, Canada
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38
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Handlin L, Jonas W, Ransjö-Arvidson AB, Petersson M, Uvnäs-Moberg K, Nissen E. Influence of common birth interventions on maternal blood pressure patterns during breastfeeding 2 days after birth. Breastfeed Med 2012; 7:93-9. [PMID: 22313391 DOI: 10.1089/bfm.2010.0099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study investigated possible influences of medical interventions during labor on maternal blood pressure during a breastfeed 2 days postpartum. SUBJECTS AND METHODS Sixty-six primiparae with normal deliveries were consecutively recruited. Blood pressure was measured at -5, 10, 30, and 60 minutes during a morning breastfeed 2 days postpartum. Five treatment groups were formed based on the medical interventions received during labor: Non-medicated mothers (Control group, n=21); mothers receiving epidural analgesia (EDA) with oxytocin (OT) stimulation (EDA(OT) group, n=14); mothers receiving EDA without OT stimulation (EDA(non-OT) group, n=7); mothers receiving OT stimulation only (OT intravenously [iv] group, n=9); and mothers receiving 10 IU of OT intramuscularly (im) only (OT im group, n=15). RESULTS Baseline diastolic, but not systolic, blood pressure differed between the groups as displayed by significantly lower diastolic blood pressure in the EDA(non-OT) group compared with the Control group, the OT iv group, and the EDA(OT) group (p=0.045, p=0.041, and p=0.024, respectively). Both systolic and diastolic blood pressure fell significantly during the breastfeeding session in the Control group (p=0.001 and p=0.004, respectively), the OT im group (p=0.006 and p=0.001, respectively), and the EDA(OT) group (p=0.028 and p=0.002, respectively), and the fall in diastolic blood pressure tended to be significant in the OT iv group (p=0.050). The duration of skin-to-skin contact before breastfeeding correlated positively with the decrease in systolic blood pressure in the OT im group (R(s)=0.540, p=0.046). CONCLUSION Administration of EDA during labor lowers baseline diastolic blood pressure and abolishes the fall in blood pressure in response to a breastfeed 2 days after birth.
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Affiliation(s)
- Linda Handlin
- Systems Biology Research Center, University of Skövde, Skövde, Sweden.
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Williams SK, Barber JS, Jamieson-Drake AW, Enns JA, Townsend LB, Walker CH, Johns JM. Chronic cocaine exposure during pregnancy increases postpartum neuroendocrine stress responses. J Neuroendocrinol 2012; 24:701-11. [PMID: 22309318 PMCID: PMC3314094 DOI: 10.1111/j.1365-2826.2012.02291.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The cycle of chronic cocaine (CC) use and withdrawal results in increased anxiety, depression and disrupted stress-responsiveness. Oxytocin and corticosterone (CORT) interact to mediate hormonal stress responses and can be altered by cocaine use. These neuroendocrine signals play important regulatory roles in a variety of social behaviours, specifically during the postpartum period, and are sensitive to disruption by CC exposure in both clinical settings and preclinical models. To determine whether CC exposure during pregnancy affected behavioural and hormonal stress response in the early postpartum period in a rodent model, Sprague-Dawley rats were administered cocaine daily (30 mg/kg) throughout gestation (days 1-20). Open field test (OFT) and forced swim test (FST) behaviours were measured on postpartum day 5. Plasma CORT concentrations were measured before and after testing throughout the test day, whereas plasma and brain oxytocin concentrations were measured post-testing only. The results obtained indicated increased CORT response after the OFT in CC-treated dams (P ≤ 0.05). CC-treated dams also exhibited altered FST behaviour (P ≤ 0.05), suggesting abnormal stress responsiveness. Peripheral, but not central, oxytocin levels were increased by cocaine treatment (P ≤ 0.05). Peripheral oxytocin and CORT increased after the FST, regardless of treatment condition (P ≤ 0.05). Changes in stress-responsiveness, both behaviourally and hormonally, may underlie some deficits in maternal behaviour; thus, a clearer understanding of the effect of CC on the stress response system may potentially lead to treatment interventions that could be relevant to clinical populations. Additionally, these results indicate that CC treatment can have long-lasting effects on peripheral oxytocin regulation in rats, similar to changes observed in persistent social behaviour and stress-response deficits in clinical populations.
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Affiliation(s)
- S K Williams
- Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA.
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Ebstein RP, Knafo A, Mankuta D, Chew SH, Lai PS. The contributions of oxytocin and vasopressin pathway genes to human behavior. Horm Behav 2012; 61:359-79. [PMID: 22245314 DOI: 10.1016/j.yhbeh.2011.12.014] [Citation(s) in RCA: 181] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 12/20/2011] [Accepted: 12/21/2011] [Indexed: 01/23/2023]
Abstract
Arginine vasopressin (AVP) and oxytocin (OXT) are social hormones and mediate affiliative behaviors in mammals and as recently demonstrated, also in humans. There is intense interest in how these simple nonapeptides mediate normal and abnormal behavior, especially regarding disorders of the social brain such as autism that are characterized by deficits in social communication and social skills. The current review examines in detail the behavioral genetics of the first level of human AVP-OXT pathway genes including arginine vasopressin 1a receptor (AVPR1a), oxytocin receptor (OXTR), AVP (AVP-neurophysin II [NPII]) and OXT (OXT neurophysin I [NPI]), oxytocinase/vasopressinase (LNPEP), ADP-ribosyl cyclase (CD38) and arginine vasopressin 1b receptor (AVPR1b). Wherever possible we discuss evidence from a variety of research tracks including molecular genetics, imaging genomics, pharmacology and endocrinology that support the conclusions drawn from association studies of social phenotypes and detail how common polymorphisms in AVP-OXT pathway genes contribute to the behavioral hard wiring that enables individual Homo sapiens to interact successfully with conspecifics. This article is part of a Special Issue entitled Oxytocin, Vasopressin, and Social Behavior.
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Affiliation(s)
- Richard P Ebstein
- Department of Psychology, National University of Singapore, Singapore.
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41
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Stuebe AM, Grewen K, Pedersen CA, Propper C, Meltzer-Brody S. Failed lactation and perinatal depression: common problems with shared neuroendocrine mechanisms? J Womens Health (Larchmt) 2012; 21:264-72. [PMID: 22204416 PMCID: PMC3298672 DOI: 10.1089/jwh.2011.3083] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
In the early postpartum period, mother and infant navigate a critical neuroendocrine transition from pregnancy to lactation. Two major clinical problems that occur during this transition are failed lactation and perinatal mood disorders. These disorders often overlap in clinical settings. Failed lactation is common. Although all major medical organizations recommend 6 months of exclusive breastfeeding, only 13% of women in the United States achieve this recommendation. Perinatal mood disorders affect 10% of mothers, with substantial morbidity for mother and child. We hypothesize that shared neuroendocrine mechanisms contribute to both failed lactation and perinatal mood disorders. In this hypothesis article, we discuss data from both animal models and clinical studies that suggest neuroendocrine mechanisms that may underlie these two disorders. Research to elucidate the role of these underlying mechanisms may identify treatment strategies both to relieve perinatal depression and to enable women to achieve their infant feeding goals.
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Affiliation(s)
- Alison M Stuebe
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599, USA.
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Stuebe AM, Schwarz EB, Grewen K, Rich-Edwards JW, Michels KB, Foster EM, Curhan G, Forman J. Duration of lactation and incidence of maternal hypertension: a longitudinal cohort study. Am J Epidemiol 2011; 174:1147-58. [PMID: 21997568 PMCID: PMC3246687 DOI: 10.1093/aje/kwr227] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 06/01/2011] [Indexed: 12/31/2022] Open
Abstract
Never or curtailed lactation has been associated with an increased risk for incident hypertension, but the effect of exclusive breastfeeding is unknown. The authors conducted an observational cohort study of 55,636 parous women in the US Nurses' Health Study II. From 1991 to 2005, participants reported 8,861 cases of incident hypertension during 660,880 person-years of follow-up. Never or curtailed lactation was associated with an increased risk of incident hypertension. Compared with women who breastfed their first child for ≥12 months, women who did not breastfeed were more likely to develop hypertension (hazard ratio (HR) = 1.27, 95% confidence interval (CI): 1.18, 1.36), adjusting for family history and lifestyle covariates. Women who never breastfed were more likely to develop hypertension than women who exclusively breastfed their first child for ≥6 months (HR = 1.29, 95% CI: 1.20, 1.40). The authors found similar results for women who had never breastfed compared with those who had breastfed each child for an average of ≥12 months (HR = 1.22, 95% CI: 1.13, 1.32). In conclusion, never or curtailed lactation was associated with an increased risk of incident maternal hypertension, compared with the recommended ≥6 months of exclusive or ≥12 months of total lactation per child, in a large cohort of parous women.
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Affiliation(s)
- Alison M Stuebe
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA.
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van Anders SM, Goldey KL, Kuo PX. The Steroid/Peptide Theory of Social Bonds: integrating testosterone and peptide responses for classifying social behavioral contexts. Psychoneuroendocrinology 2011; 36:1265-75. [PMID: 21724336 DOI: 10.1016/j.psyneuen.2011.06.001] [Citation(s) in RCA: 194] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 05/25/2011] [Accepted: 06/02/2011] [Indexed: 01/06/2023]
Abstract
Hormones, and hormone responses to social contexts, are the proximate mechanisms of evolutionary pathways to pair bonds and other social bonds. Testosterone (T) is implicated in tradeoffs relevant to pair bonding, and oxytocin (OT) and arginine vasopressin (AVP) are positively tied to social bonding in a variety of species. Here, we present the Steroid/Peptide Theory of Social Bonds (S/P Theory), which integrates T and peptides to provide a model, set of predictions, and classification system for social behavioral contexts related to social bonds. The S/P Theory also resolves several paradoxes apparent in the literature on social bonds and hormones: the Offspring Defense Paradox, Aggression Paradox, and Intimacy Paradox. In the S/P Theory, we partition aggression into antagonistic and protective aggression, which both increase T but exert distinct effects on AVP and thus social bonds. Similarly, we partition intimacy into sexual and nurturant intimacy, both of which increase OT and facilitate social bonds, but exert distinct effects on T. We describe the utility of the S/P Theory for classifying 'tricky' behavioral contexts on the basis of their hormonal responses using partner cuddling, a behavior which is assumed to be nurturant but increases T, as a test case of the S/P Theory. The S/P Theory provides a comparative basis for conceptualizing and testing evolved hormonal pathways to pair bonds with attention to species, context, and gender/sex specificities and convergences.
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Affiliation(s)
- Sari M van Anders
- Department of Psychology, University of Michigan, 530 Church Street, Ann Arbor, MI 48109, USA.
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Holt-Lunstad J, Birmingham W, Light KC. The influence of depressive symptomatology and perceived stress on plasma and salivary oxytocin before, during and after a support enhancement intervention. Psychoneuroendocrinology 2011; 36:1249-56. [PMID: 21507578 DOI: 10.1016/j.psyneuen.2011.03.007] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2010] [Revised: 02/15/2011] [Accepted: 03/15/2011] [Indexed: 02/01/2023]
Abstract
Oxytocin (OT) activity increases in response to stress as well as to warm social contact. Subclinical depression is associated with higher stress but less reward from social contacts. The present investigation was intended to examine whether husbands and wives with high depressive symptomatology scores have increased plasma and salivary OT that may be mediated partly by higher perceived stress, and also to assess whether an intervention to convey partner support through "warm touch" may reduce effects of depressive symptoms on OT. In this study, 34 healthy married couples (n=68) ages 20-39 provided self reports of depressive symptoms (CESD) and stress (Perceived Stress Scale) before being randomly assigned to a 4-week intervention study enhancing partner support through "warm touch", or to a "behavior monitoring" control group. Plasma oxytocin levels were obtained pre- and post-intervention, while salivary oxytocin was taken at home during week 1 and week 4. Results revealed that subjects with higher depressive symptoms scores had higher plasma OT levels at pre-intervention, and higher salivary OT levels at home during week 1 (p<.05). Plasma OT results were moderated by gender such that plasma OT levels were highest among females high in depressive symptomology. Higher perceived stress was also linked to both higher depressive symptomatology (r=+65, p<.0001) and plasma OT (p< .05) and a significant mediator. During the intervention, salivary OT remained elevated among subjects high in depressive symptomatology in the control group but not the intervention group. At post-intervention, plasma OT levels in subjects with vs. without depressive symptomatology no longer differed. Results indicate that subclinical depression is associated with elevated plasma and salivary OT levels, which may be mediated in part by increased stress. OT differences linked to subclinical depression were minimized by the warm touch intervention.
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Hahn-Holbrook J, Holt-Lunstad J, Holbrook C, Coyne SM, Lawson ET. Maternal defense: breast feeding increases aggression by reducing stress. Psychol Sci 2011; 22:1288-95. [PMID: 21873570 DOI: 10.1177/0956797611420729] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Mothers in numerous species exhibit heightened aggression in defense of their young. This shift typically coincides with the duration of lactation in nonhuman mammals, which suggests that human mothers may display similarly accentuated aggressiveness while breast feeding. Here we report the first behavioral evidence for heightened aggression in lactating humans. Breast-feeding mothers inflicted louder and longer punitive sound bursts on unduly aggressive confederates than did formula-feeding mothers or women who had never been pregnant. Maternal aggression in other mammals is thought to be facilitated by the buffering effect of lactation on stress responses. Consistent with the animal literature, our results showed that while lactating women were aggressing, they exhibited lower systolic blood pressure than did formula-feeding or never-pregnant women while they were aggressing. Mediation analyses indicated that reduced arousal during lactation may disinhibit female aggression. Together, our results highlight the contributions of breast feeding to both protecting infants and buffering maternal stress.
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Quirin M, Kuhl J, Düsing R. Oxytocin buffers cortisol responses to stress in individuals with impaired emotion regulation abilities. Psychoneuroendocrinology 2011; 36:898-904. [PMID: 21208748 DOI: 10.1016/j.psyneuen.2010.12.005] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 12/06/2010] [Accepted: 12/07/2010] [Indexed: 11/16/2022]
Abstract
Oxytocin facilitates stress regulation but little is known about individual differences in this effect. The present study investigates whether the effect of intranasal oxytocin on stress-contingent cortisol release differs between individuals with high vs. low emotional regulation abilities (ERA). In a double-blind study thirty-six healthy male students with either high or low ERA were randomly assigned to receive intranasally 24 IU oxytocin or placebo. Cortisol was measured at several times before and after a social stressor (public speaking). Individuals with impaired ERA showed a reduced cortisol response to stress after oxytocin but an increased cortisol response after placebo application. The results suggest that healthy individuals with low ERA benefit from intranasal oxytocin application. Neurobiological mechanisms potentially underlying the link between oxytocin, cortsiol and ERA are discussed against the background of a neuroendocrinological perspective on personality.
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Affiliation(s)
- Markus Quirin
- Department of Psychology, University of Osnabrück, Osnabrück, Germany.
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Grewen KM, Light KC. Plasma oxytocin is related to lower cardiovascular and sympathetic reactivity to stress. Biol Psychol 2011; 87:340-9. [PMID: 21540072 DOI: 10.1016/j.biopsycho.2011.04.003] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Revised: 03/29/2011] [Accepted: 04/12/2011] [Indexed: 12/31/2022]
Abstract
In addition to known reproductive and social affiliation functions, oxytocin (OT) has been identified as a cardiovascular hormone. OT synthesis and receptors are found in cardiac and vascular tissue. Animal studies suggest that OT activates an 'anti-stress' response that reduces cardiovascular and neuroendocrine stress reactivity. We tested 28 early postpartum mothers, obtaining multiple blood samples for OT, the sympathetic marker, norepinephrine (NE), and the lactation hormone, prolactin, while monitoring their cardiovascular responses to two stressors: public speaking and forehead cold pressor. Although plasma OT did not increase reliably from pre-stress levels during stressors, greater overall OT level was related to greater vasodilation and cardiac stroke volume responses to both tasks, to reduction in heart rate to the cold pressor, as well as to lower plasma NE and higher prolactin levels. In contrast, higher NE was linked to increases in heart rate and decreases in stroke volume. These data support a cardioprotective role for OT, which may influence the magnitude and hemodynamic determinants of cardiovascular stress responses.
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Affiliation(s)
- Karen M Grewen
- University of North Carolina School of Medicine, Department of Psychiatry, CB#: 7175, Chapel Hill, NC 27599-7175, USA.
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Stuebe AM, Mantzoros C, Kleinman K, Gillman MW, Rifas-Shiman S, Gunderson EP, Rich-Edwards J. Duration of lactation and maternal adipokines at 3 years postpartum. Diabetes 2011; 60:1277-85. [PMID: 21350085 PMCID: PMC3064101 DOI: 10.2337/db10-0637] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Lactation has been associated with reduced maternal risk of type 2 diabetes, the metabolic syndrome, and cardiovascular disease. We examined the relationship between breastfeeding duration and maternal adipokines at 3 years postpartum. RESEARCH DESIGN AND METHODS We used linear regression to relate the duration of lactation to maternal leptin, adiponectin, ghrelin, and peptide YY (PYY) at 3 years postpartum among 570 participants with 3-year postpartum blood samples (178 fasting), prospectively collected lactation history, and no intervening pregnancy in Project Viva, a cohort study of mothers and children. RESULTS A total of 88% of mothers had initiated breastfeeding, 26% had breastfed ≥ 12 months, and 42% had exclusively breastfed for ≥ 3 months. In multivariate analyses, we found that duration of total breastfeeding was directly related to PYY and ghrelin, and exclusive breastfeeding duration was directly related to ghrelin (predicted mean for never exclusively breastfeeding: 790.6 pg/mL vs. ≥ 6 months of exclusive breastfeeding: 1,008.1 pg/mL; P < 0.01) at 3 years postpartum, adjusting for pregravid BMI, gestational weight gain, family history of diabetes, parity, smoking status, and age. We found a nonlinear pattern of association between exclusive breastfeeding duration and adiponectin in multivariate-adjusted models. CONCLUSIONS In this prospective cohort study, we found a direct relationship between the duration of lactation and both ghrelin and PYY at 3 years postpartum.
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Affiliation(s)
- Alison M Stuebe
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
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Galbally M, Lewis AJ, Ijzendoorn MV, Permezel M. The role of oxytocin in mother-infant relations: a systematic review of human studies. Harv Rev Psychiatry 2011; 19:1-14. [PMID: 21250892 DOI: 10.3109/10673229.2011.549771] [Citation(s) in RCA: 166] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Oxytocin is associated with the establishment and quality of maternal behavior in animal models. Parallel investigations in humans are now under way. This article reviews the current research examining the role of oxytocin in mother-infant relations, attachment, and bonding in humans. METHODS A systematic search was made of three electronic databases and other bibliographic sources for published research studies that examined oxytocin and mother-infant relations in humans, including attachment, maternal behavior, parenting, and mother-infant relations. RESULTS Eight studies were identified, all of which were unique in their methodologies, populations studied, and measures used. Seven studies found significant and strong associations between levels or patterns of oxytocin and aspects of mother-infant relations or attachment. CONCLUSIONS Oxytocin appears to be of crucial importance for understanding mother-infant relationships. The findings of this review suggest that the pioneering, but preliminary, research undertaken to date is promising and that replication with larger samples is needed. Research that draws on more robust measures of attachment and bonding, as well as improved measures of oxytocin that include both central and peripheral levels, will elucidate the role of oxytocin in human mother-infant relationships. As the production of oxytocin is by no means restricted to mothers, the extension of the oxytocin studies to fathering, as well as to alloparental caregiving, would be an intriguing next step.
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Lee HJ, Pagani J, Young WS. Using transgenic mouse models to study oxytocin's role in the facilitation of species propagation. Brain Res 2010; 1364:216-24. [PMID: 20732312 DOI: 10.1016/j.brainres.2010.08.042] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 08/12/2010] [Accepted: 08/15/2010] [Indexed: 12/31/2022]
Abstract
Oxytocin and its receptor are important for a wide range of effects, from social memory to uterine contractions. It is an evolutionarily well-conserved hormone that is particularly important in social and gregarious animals. Research on small mammals has yielded a rich literature on oxytocin's many functions. Recently a new tool has been created that has furthered our understanding of oxytocin's role in behavior: transgenic mice that lack either the ability to synthesize oxytocin or the oxytocin receptor itself. The study of these lines, while still in its infancy, is already bearing fruit and offers the promise of insight into some human disorders characterized by aberrant social behavior.
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Affiliation(s)
- Heon-Jin Lee
- Department of Dental Microbiology, School of Dentistry, Kyungpook National University, Daegu, South Korea
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