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Saghian R, Cahill LS, Debebe SK, Rahman A, Serghides L, McDonald CR, Weckman AM, Kain KC, Sled JG. Allometric scaling relationships in mouse placenta. J R Soc Interface 2022; 19:20220579. [PMID: 36349448 PMCID: PMC9653247 DOI: 10.1098/rsif.2022.0579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/19/2022] [Indexed: 08/29/2023] Open
Abstract
Fetal growth and maturation are highly intertwined with placental development during pregnancy. Here we used placental vascular morphology measurements (depth and span) as well as the umbilical artery (UA) diameter of previously published studies on three different mouse strains (C57BL6/J, CD-1 and BALB/c), which were exposed to different conditions (combination antiretroviral therapy, chronic maternal hypoxia and malaria infection) at different embryonic days, to test the hypothesis that placental vascularization and specifically the UA size affect conceptus weight. Interaction of each study parameter with embryonic day, strain and exposure to treatments are studied to investigate the stability of the scaling relationships across and/or within strains and conditions. In addition, the effect of UA diameter on the placental growth measurements (depth and span) is studied. These results show that the power-law scaling relationship of conceptus weight and placental depth with the UA diameter is conserved across strains and conditions with the scaling exponent of approximately 3/8 and 5/8, respectively. By contrast, the relationship between conceptus weight and either the placental span or depth is different between strains and conditions, suggesting multiple mechanisms of vascular adaptation.
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Affiliation(s)
- Rojan Saghian
- Mouse Imaging Centre, 25 Orde Street, Toronto, Ontario, Canada
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Lindsay S. Cahill
- Mouse Imaging Centre, 25 Orde Street, Toronto, Ontario, Canada
- Department of Chemistry, Memorial University of Newfoundland, Newfoundland and Labrador, St John’s, Canada
| | - Sarah K. Debebe
- Mouse Imaging Centre, 25 Orde Street, Toronto, Ontario, Canada
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Medical Biophysics, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
| | - Anum Rahman
- Mouse Imaging Centre, 25 Orde Street, Toronto, Ontario, Canada
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Medical Biophysics, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
| | - Lena Serghides
- Department of Immunology and Institute of Medical Sciences, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario, Canada
- Women’s College Research Institute, Women’s College Hospital, Toronto, Ontario, Canada
| | - Chloe R. McDonald
- Institute of Medical Science, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Sandra A. Rotman Laboratories, Sandra Rotman Centre for Global Health, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
| | - Andrea M. Weckman
- Sandra A. Rotman Laboratories, Sandra Rotman Centre for Global Health, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Kevin C. Kain
- Institute of Medical Science, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Sandra A. Rotman Laboratories, Sandra Rotman Centre for Global Health, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Tropical Disease Unit, Division of Infectious Diseases, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - John G. Sled
- Mouse Imaging Centre, 25 Orde Street, Toronto, Ontario, Canada
- Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada
- Department of Medical Biophysics, University Health Network-Toronto General Hospital, Toronto, Ontario, Canada
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada
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Rahman A, DeYoung T, Cahill LS, Yee Y, Debebe SK, Botelho O, Seed M, Chaturvedi RR, Sled JG. A mouse model of hypoplastic left heart syndrome demonstrating left heart hypoplasia and retrograde aortic arch flow. Dis Model Mech 2021; 14:dmm049077. [PMID: 34514502 PMCID: PMC8592017 DOI: 10.1242/dmm.049077] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 09/03/2021] [Indexed: 01/06/2023] Open
Abstract
In hypoplastic left heart syndrome (HLHS), the mechanisms leading to left heart hypoplasia and their associated fetal abnormalities are largely unknown. Current animal models have limited utility in resolving these questions as they either do not fully reproduce the cardiac phenotype, do not survive to term and/or have very low disease penetrance. Here, we report the development of a surgically induced mouse model of HLHS that overcomes these limitations. Briefly, we microinjected the fetal left atrium of embryonic day (E)14.5 mice with an embolizing agent under high-frequency ultrasound guidance, which partially blocks blood flow into the left heart and induces hypoplasia. At term (E18.5), all positively embolized mice exhibit retrograde aortic arch flow, non-apex-forming left ventricles and hypoplastic ascending aortas. We thus report the development of the first mouse model of isolated HLHS with a fully penetrant cardiac phenotype and survival to term. Our method allows for the interrogation of previously intractable questions, such as determining the mechanisms of cardiac hypoplasia and fetal abnormalities observed in HLHS, as well as testing of mechanism-based therapies, which are urgently lacking.
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Affiliation(s)
- Anum Rahman
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
- Translational Medicine, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Taylor DeYoung
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
| | - Lindsay S. Cahill
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
- Department of Chemistry, Memorial University of Newfoundland, St John's, NL A1B 3X7, Canada
| | - Yohan Yee
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Sarah K. Debebe
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
- Translational Medicine, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Owen Botelho
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
| | - Mike Seed
- Division of Pediatric Cardiology, Department of Pediatrics, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Rajiv R. Chaturvedi
- Division of Pediatric Cardiology, Department of Pediatrics, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - John G. Sled
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON M5T 3H7, Canada
- Translational Medicine, The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, ON M5G 1E2, Canada
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Debebe SK, Cahill LS, Kingdom JC, Whitehead CL, Chandran AR, Parks WT, Serghides L, Baschat A, Macgowan CK, Sled JG. Wharton's jelly area and its association with placental morphometry and pathology. Placenta 2020; 94:34-38. [PMID: 32421532 DOI: 10.1016/j.placenta.2020.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 03/06/2020] [Accepted: 03/21/2020] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Wharton's jelly (WJ) is the mucoid connective tissue that surrounds the vessels in the human umbilical cord and provides protection from compression and torsion in response to fetal movement. WJ is known to be altered in the presence of pregnancy complications such as gestational diabetes mellitus and preeclampsia. The present study examined associations between the cross-sectional area of WJ measured by ultrasound and postpartum placental pathology and morphometry. METHODS The area of WJ was measured by ultrasound in 156 eligible participants between 23 and 37 weeks' gestation. Morphometric assessment of fixed cord cross sections was conducted, together with assessment of the cord and placenta for specific pathologies using standard criteria. RESULTS From 156 participants, 123 ultrasound images met the data quality requirements and pathology reporting was completed for 99 placentas. 17 of the participants (14%) delivered a small for gestational age neonate and 32 of the 99 placentas examined (32%) had significant placental pathology findings. Area of WJ was associated with low birth weight (p = 0.002) and was associated with specific placental pathology (p = 0.01). WJ area was positively associated with placental dimensions such as width, length and surface area. DISCUSSION Decreased WJ area is associated with clinically-significant placental pathology and WJ area scales proportionally with placental size. These findings suggest that WJ area correlates with functional capacity of the placenta and thus merits further evaluation alongside currently-available tests of placental function in clinical practice.
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Affiliation(s)
- Sarah K Debebe
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
| | - Lindsay S Cahill
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - John C Kingdom
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada; Mount Sinai Hospital, Toronto, Ontario, Canada
| | | | | | - W Tony Parks
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada; Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Lena Serghides
- Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario, Canada; Department of Immunology and Institute of Medical Sciences, University of Toronto, Ontario, Canada; Women's College Research Institute, Women's College Hospital, Toronto, Ontario, Canada
| | - Ahmet Baschat
- Centre for Fetal Therapy, Johns Hopkins Medicine, Baltimore, MD, USA
| | - Christopher K Macgowan
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada; Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
| | - John G Sled
- Mouse Imaging Centre, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada; Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada; Translational Medicine, The Hospital for Sick Children, Toronto, Ontario, Canada
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