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Tabak BA, Leng G, Szeto A, Parker KJ, Verbalis JG, Ziegler TE, Lee MR, Neumann ID, Mendez AJ. Advances in human oxytocin measurement: challenges and proposed solutions. Mol Psychiatry 2023; 28:127-140. [PMID: 35999276 PMCID: PMC9812775 DOI: 10.1038/s41380-022-01719-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 07/18/2022] [Accepted: 07/21/2022] [Indexed: 01/09/2023]
Abstract
Oxytocin, a neuropeptide known for its role in reproduction and socioemotional processes, may hold promise as a therapeutic agent in treating social impairments in patient populations. However, research has yet to uncover precisely how to manipulate this system for clinical benefit. Moreover, inconsistent use of standardized and validated oxytocin measurement methodologies-including the design and study of hormone secretion and biochemical assays-present unresolved challenges. Human studies measuring peripheral (i.e., in plasma, saliva, or urine) or central (i.e., in cerebrospinal fluid) oxytocin concentrations have involved very diverse methods, including the use of different assay techniques, further compounding this problem. In the present review, we describe the scientific value in measuring human endogenous oxytocin concentrations, common issues in biochemical analysis and study design that researchers face when doing so, and our recommendations for improving studies using valid and reliable methodologies.
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Affiliation(s)
- Benjamin A Tabak
- Department of Psychology, Southern Methodist University, Dallas, TX, USA.
| | - Gareth Leng
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Angela Szeto
- Department of Psychology, University of Miami, Coral Gables, FL, USA
| | - Karen J Parker
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, USA
- Department of Comparative Medicine, Stanford University, Stanford, CA, USA
| | - Joseph G Verbalis
- Division of Endocrinology and Metabolism, Department of Medicine, Georgetown University Medical Center, Washington, DC, USA
| | - Toni E Ziegler
- Assay Services Unit and Institute for Clinical and Translational Research Core Laboratory, National Primate Research Center, University of Wisconsin-Madison, Madison, WI, USA
| | - Mary R Lee
- Veterans Affairs Medical Center, Washington, DC, USA
| | - Inga D Neumann
- Department of Behaviour and Molecular Neurobiology, University of Regensburg, Regensburg, Germany
| | - Armando J Mendez
- Diabetes Research Institute, Department of Medicine, Miller School of Medicine, University of Miami, Miami, FL, USA
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Utility of Downstream Biomarkers to Assess and Optimize Intranasal Delivery of Oxytocin. Pharmaceutics 2022; 14:pharmaceutics14061178. [PMID: 35745751 PMCID: PMC9228821 DOI: 10.3390/pharmaceutics14061178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 02/05/2023] Open
Abstract
Oxytocin (OT), a mammalian neurohormone associated with social cognition and behavior, can be administered in its synthetic form intranasally (IN) and impact brain chemistry and behavior. IN-OT shows potential as a noninvasive intervention for disorders characterized by social challenges, e.g., autism spectrum disorder (ASD) and anorexia nervosa (AN). To evaluate IN-OT’s efficacy, we must quantify OT uptake, availability, and clearance; thus, we assessed OT levels in urine (uOT) before and after participants (26 ASD, 7 AN, and 7 healthy controls) received 40 IU IN-OT or placebo across two sessions using double-blind, placebo-controlled crossover designs. We also measured uOT and plasma (pOT) levels in a subset of participants to compare the two sampling methods. We found significantly higher uOT and pOT following intranasal delivery of active compound versus placebo, but analyses yielded larger effect sizes and more clearly differentiated pre–post-OT levels for uOT than pOT. Further, we applied a two-step cluster (TSC), blinded backward-chaining approach to determine whether active/placebo groups could be identified by uOT and pOT change alone; uOT levels may serve as an accessible and accurate systemic biomarker for OT dose–response. Future studies will explore whether uOT levels correlate directly with behavioral targets to improve dosing for therapeutic goals.
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Francis SM, Kirkpatrick MG, de Wit H, Jacob S. Urinary and plasma oxytocin changes in response to MDMA or intranasal oxytocin administration. Psychoneuroendocrinology 2016; 74:92-100. [PMID: 27592327 DOI: 10.1016/j.psyneuen.2016.08.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 08/13/2016] [Accepted: 08/13/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND The neuropeptide oxytocin (OT) has received increased experimental attention for its putative role in both normal social functioning and several psychiatric disorders that are partially characterized by social dysfunction (e.g., autism spectrum disorders: ASD). Many human experimental studies measure circulating plasma levels of OT in order to examine the relationship between the hormone and behavior. Urinary OT (uOT) assays offer a simple, easy, and non-invasive method to measure peripheral hormone levels, but the correspondence between uOT and plasma OT (pOT) levels is unclear. Here, we conducted two within-subjects, double-blind studies exploring changes in uOT and pOT levels following administration of two drugs: MDMA, an oxytocin-releasing drug (Study 1), and intranasal oxytocin (INOT: Study 1 and 2). METHODS In Study 1, 14 adult participants (2 females) were each administered either oral 1.5mg/kg MDMA or 40IU INOT across two different study sessions. In Study 2, 10 male participants (adolescents and young adults) diagnosed with ASD received either 40IU INOT or placebo across two different sessions. In both studies, blood and urine samples were collected before and after drug administration at each study session. For Study 1, 10 participants provided valid plasma and urine samples for the MDMA session, and 8 provided valid samples for the INOT session. For Study 2, all 10 participants provided valid samples for both INOT and placebo sessions. Pre- and post-administration levels of pOT and uOT were compared. Additionally, correlations between percent change from baseline uOT and pOT levels were examined. RESULTS Study 1: Plasma OT and uOT levels significantly increased after administration of MDMA and INOT. Furthermore, uOT levels were positively correlated with pOT levels following administration of MDMA (r=0.57, p=0.042) but not INOT (r=0.51, p=0.097). Study 2: There was a significant increase in uOT levels after administration of INOT, but not after administration of placebo. Under both conditions, INOT and placebo, significant increases in pOT levels were not observed. Additionally, change from baseline uOT and pOT levels were positively correlated (r=0.57, p=0.021). There was no significant correlation between uOT and pOT levels following placebo administration. CONCLUSION Our results show a measurable and significant increase in pOT and uOT levels after the administration of MDMA (Study 1) and INOT (Study 1 and Study 2). Additionally, a positive correlation between uOT and pOT levels was observed in both samples (healthy adults and ASD patients) in at least one condition. However, uOT and pOT levels were not correlated under all conditions, suggesting that uOT levels do not fully correspond to pOT levels in the time windows we measured. Future studies should further examine the relationship between levels of pOT and uOT in healthy and clinical populations on measures of social behavior because uOT may serve as an additional non-invasive method to measure peripheral OT changes.
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Affiliation(s)
- Sunday M Francis
- Institute of Juvenile Research, Department of Psychiatry, University of Illinois at Chicago, 1747 West Roosevelt Road, Chicago, IL 60608, USA.
| | - Matthew G Kirkpatrick
- Department of Psychiatry and Behavioral Neuroscience, University of Chicago, A27 South Maryland Avenue, Chicago, IL 60637, USA.
| | - Harriet de Wit
- Department of Psychiatry and Behavioral Neuroscience, University of Chicago, A27 South Maryland Avenue, Chicago, IL 60637, USA.
| | - Suma Jacob
- Institute of Juvenile Research, Department of Psychiatry, University of Illinois at Chicago, 1747 West Roosevelt Road, Chicago, IL 60608, USA.
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Pratt M, Apter-Levi Y, Vakart A, Feldman M, Fishman R, Feldman T, Zagoory-Sharon O, Feldman R. MATERNAL DEPRESSION AND CHILD OXYTOCIN RESPONSE; MODERATION BY MATERNAL OXYTOCIN AND RELATIONAL BEHAVIOR. Depress Anxiety 2015; 32:635-46. [PMID: 26130435 DOI: 10.1002/da.22392] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 05/06/2015] [Accepted: 06/07/2015] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Maternal postpartum depression (PPD) carries long-term detrimental effects on children's well-being, yet the mechanisms of transmission remain unclear. One possible pathway of vulnerability involves the oxytocinergic (OT) system, which is transferred from mother to child via sensitive caregiving and is disrupted in PPD. METHOD A large birth cohort (N = 1983) of women were repeatedly assessed for depression from birth to 6 years. Utilizing an extreme case design, two matched cohorts were formed; mothers chronically depressed from birth to 6 years and nondepressed controls (N = 97, depressed = 41, nondepressed; N = 56). At 6 years, mothers and children underwent psychiatric diagnosis, urinary OT was assayed from mother and child before and after social contact, and mother-child interactions were coded. RESULTS Baseline OT and OT response of mother and child were interrelated and children of depressed mothers showed low baseline OT and attenuated OT response. Child OT response was negatively predicted by maternal depression, child Axis-I psychopathology, maternal expressed negative affect, and child social withdrawal. Interaction effect of maternal baseline OT and depression emerged. Slope analysis indicated that when maternal OT was medium or low, child OT response was negatively impacted by maternal depression. However, when maternal OT was high, child OT was unaffected, suggesting that maternal OT functionality buffers the effects of depression on the child. CONCLUSION Results suggest involvement of the OT system in the cross-generational transfer of vulnerability, as well as resilience, from depressed mothers to their children. Because the OT system is open to interventions that enhance maternal touch and contact, findings have important implications for targeted early dyadic inventions.
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Affiliation(s)
- Maayan Pratt
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Yael Apter-Levi
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Adam Vakart
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Michal Feldman
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Ruth Fishman
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Tamar Feldman
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Orna Zagoory-Sharon
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
| | - Ruth Feldman
- Department of Psychology, The Gonda Brain Sciences Center, Bar-Ilan University, Ramat-Gan, Israel
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Luo L, Ma X, Zheng X, Zhao W, Xu L, Becker B, Kendrick KM. Neural systems and hormones mediating attraction to infant and child faces. Front Psychol 2015; 6:970. [PMID: 26236256 PMCID: PMC4505392 DOI: 10.3389/fpsyg.2015.00970] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 06/28/2015] [Indexed: 12/04/2022] Open
Abstract
We find infant faces highly attractive as a result of specific features which Konrad Lorenz termed “Kindchenschema” or “baby schema,” and this is considered to be an important adaptive trait for promoting protective and caregiving behaviors in adults, thereby increasing the chances of infant survival. This review first examines the behavioral support for this effect and physical and behavioral factors which can influence it. It then provides details of the increasing number of neuroimaging and electrophysiological studies investigating the neural circuitry underlying this baby schema effect in parents and non-parents of both sexes. Next it considers potential hormonal contributions to the baby schema effect in both sexes and the neural effects associated with reduced responses to infant cues in post-partum depression, anxiety and drug taking. Overall the findings reviewed reveal a very extensive neural circuitry involved in our perception of cuteness in infant faces, with enhanced activation compared to adult faces being found in brain regions involved in face perception, attention, emotion, empathy, memory, reward and attachment, theory of mind and also control of motor responses. Both mothers and fathers also show evidence for enhanced responses in these same neural systems when viewing their own as opposed to another child. Furthermore, responses to infant cues in many of these neural systems are reduced in mothers with post-partum depression or anxiety or have taken addictive drugs throughout pregnancy. In general reproductively active women tend to rate infant faces as cuter than men, which may reflect both heightened attention to relevant cues and a stronger activation in their brain reward circuitry. Perception of infant cuteness may also be influenced by reproductive hormones with the hypothalamic neuropeptide oxytocin being most strongly associated to date with increased attention and attraction to infant cues in both sexes.
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Affiliation(s)
- Lizhu Luo
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Xiaole Ma
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Xiaoxiao Zheng
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Weihua Zhao
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Lei Xu
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Benjamin Becker
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
| | - Keith M Kendrick
- Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, University of Electronic Science and Technology of China Chengdu, China
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Saito A. The marmoset as a model for the study of primate parental behavior. Neurosci Res 2015; 93:99-109. [PMID: 25575642 DOI: 10.1016/j.neures.2014.12.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 12/19/2014] [Accepted: 12/24/2014] [Indexed: 01/27/2023]
Abstract
Parental behavior is important for the development of mammalian offspring. Research on the mechanisms underlying parental behavior, however, has been largely restricted to rodent models. As a consequence, although research on parent-infant relationships has been conducted using macaque monkeys for more than half a century, little is known about the neural mechanisms and brain regions associated with such behaviors in primates. This article reviews parental behavior and its endocrinological mechanisms in marmosets and tamarins, both cooperative breeders in the callitrichid family, and compares these findings with studies of macaque monkeys. The paper examines the similarities and differences between marmosets and humans, and suggests the possibility that marmosets can be a model for future studies of the neural underpinnings and endocrinology underlying human parental behavior.
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Affiliation(s)
- Atsuko Saito
- Department of Cognitive and Behavioral Science, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.
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Alves E, Fielder A, Ghabriel N, Sawyer M, Buisman-Pijlman FTA. Early social environment affects the endogenous oxytocin system: a review and future directions. Front Endocrinol (Lausanne) 2015; 6:32. [PMID: 25814979 PMCID: PMC4356154 DOI: 10.3389/fendo.2015.00032] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 02/24/2015] [Indexed: 11/13/2022] Open
Abstract
Endogenous oxytocin plays an important role in a wide range of human functions including birth, milk ejection during lactation, and facilitation of social interaction. There is increasing evidence that both variations in the oxytocin receptor (OXTR) and concentrations of oxytocin are associated with differences in these functions. The causes for the differences that have been observed in tonic and stimulated oxytocin release remain unclear. Previous reviews have suggested that across the life course, these differences may be due to individual factors, e.g., genetic variation (of the OXTR), age or sex, or be the result of early environmental influences, such as social experiences, stress, or trauma partly by inducing epigenetic changes. This review has three aims. First, we briefly discuss the endogenous oxytocin system, including physiology, development, individual differences, and function. Second, current models describing the relationship between the early life environment and the development of the oxytocin system in humans and animals are discussed. Finally, we describe research designs that can be used to investigate the effects of the early environment on the oxytocin system, identifying specific areas of research that need further attention.
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Affiliation(s)
- Emily Alves
- School of Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- *Correspondence: Emily Alves and Femke T.A. Buisman-Pijlman, Adelaide University, 30 Frome Road, Adelaide, SA 5000, Australia e-mail: ;
| | - Andrea Fielder
- School of Midwifery, University of South Australia, Adelaide, SA, Australia
| | - Nerelle Ghabriel
- School of Midwifery, University of South Australia, Adelaide, SA, Australia
- School of Psychology, University of South Australia, Adelaide, SA, Australia
| | - Michael Sawyer
- School of Paediatrics and Reproductive Health, University of Adelaide, Adelaide, SA, Australia
- Research and Evaluation Unit, Women’s and Children’s Health Network, Adelaide, SA, Australia
| | - Femke T. A. Buisman-Pijlman
- School of Medical Sciences, University of Adelaide, Adelaide, SA, Australia
- *Correspondence: Emily Alves and Femke T.A. Buisman-Pijlman, Adelaide University, 30 Frome Road, Adelaide, SA 5000, Australia e-mail: ;
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Burkart JM, Finkenwirth C. Marmosets as model species in neuroscience and evolutionary anthropology. Neurosci Res 2014; 93:8-19. [PMID: 25242577 DOI: 10.1016/j.neures.2014.09.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 08/27/2014] [Accepted: 08/27/2014] [Indexed: 12/19/2022]
Abstract
Marmosets are increasingly used as model species by both neuroscientists and evolutionary anthropologists, but with a different rationale for doing so. Whereas neuroscientists stress that marmosets share many cognitive traits with humans due to common descent, anthropologists stress those traits shared with marmosets - and callitrichid monkeys in general - due to convergent evolution, as a consequence of the cooperative breeding system that characterizes both humans and callitrichids. Similarities in socio-cognitive abilities due to convergence, rather than homology, raise the question whether these similarities also extend to the proximate regulatory mechanisms, which is particularly relevant for neuroscientific investigations. In this review, we first provide an overview of the convergent adaptations to cooperative breeding at the psychological and cognitive level in primates, which bear important implications for our understanding of human cognitive evolution. In the second part, we zoom in on two of these convergent adaptations, proactive prosociality and social learning, and compare their proximate regulation in marmosets and humans with regard to oxytocin and cognitive top down regulation. Our analysis suggests considerable similarity in these regulatory mechanisms presumably because the convergent traits emerged due to small motivational changes that define how pre-existing cognitive mechanisms are quantitatively combined. This finding reconciles the prima facie contradictory rationale for using marmosets as high priority model species in neuroscience and anthropology.
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Affiliation(s)
- Judith M Burkart
- Anthropological Institute and Museum, University of Zurich - Irchel, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
| | - Christa Finkenwirth
- Anthropological Institute and Museum, University of Zurich - Irchel, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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