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Garcia KE, Wang X, Santiago SE, Bakshi S, Barnes AP, Kroenke CD. Longitudinal MRI of the developing ferret brain reveals regional variations in timing and rate of growth. Cereb Cortex 2024; 34:bhae172. [PMID: 38679479 PMCID: PMC11056283 DOI: 10.1093/cercor/bhae172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 12/11/2023] [Revised: 03/22/2024] [Accepted: 04/04/2024] [Indexed: 05/01/2024] Open
Abstract
Normative ferret brain development was characterized using magnetic resonance imaging. Brain growth was longitudinally monitored in 10 ferrets (equal numbers of males and females) from postnatal day 8 (P8) through P38 in 6-d increments. Template T2-weighted images were constructed at each age, and these were manually segmented into 12 to 14 brain regions. A logistic growth model was used to fit data from whole brain volumes and 8 of the individual regions in both males and females. More protracted growth was found in males, which results in larger brains; however, sex differences were not apparent when results were corrected for body weight. Additionally, surface models of the developing cortical plate were registered to one another using the anatomically-constrained Multimodal Surface Matching algorithm. This, in turn, enabled local logistic growth parameters to be mapped across the cortical surface. A close similarity was observed between surface area expansion timing and previous reports of the transverse neurogenic gradient in ferrets. Regional variation in the extent of surface area expansion and the maximum expansion rate was also revealed. This characterization of normative brain growth over the period of cerebral cortex folding may serve as a reference for ferret studies of brain development.
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Affiliation(s)
- Kara E Garcia
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Evansville, IN 47715, United States
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130, United States
| | - Xiaojie Wang
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006, United States
| | - Sarah E Santiago
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR 97239, United States
| | - Stuti Bakshi
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006, United States
| | - Anthony P Barnes
- Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR 97239, United States
| | - Christopher D Kroenke
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006, United States
- Oregon Health and Science Advanced Imaging Research Center, Portland, OR 97239, United States
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2
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Walter C, Balouchzadeh R, Garcia KE, Kroenke CD, Pathak A, Bayly PV. Multi-scale measurement of stiffness in the developing ferret brain. Sci Rep 2023; 13:20583. [PMID: 37996465 PMCID: PMC10667369 DOI: 10.1038/s41598-023-47900-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 09/12/2023] [Accepted: 11/20/2023] [Indexed: 11/25/2023] Open
Abstract
Cortical folding is an important process during brain development, and aberrant folding is linked to disorders such as autism and schizophrenia. Changes in cell numbers, size, and morphology have been proposed to exert forces that control the folding process, but these changes may also influence the mechanical properties of developing brain tissue. Currently, the changes in tissue stiffness during brain folding are unknown. Here, we report stiffness in the developing ferret brain across multiple length scales, emphasizing changes in folding cortical tissue. Using rheometry to measure the bulk properties of brain tissue, we found that overall brain stiffness increases with age over the period of cortical folding. Using atomic force microscopy to target the cortical plate, we found that the occipital cortex increases in stiffness as well as stiffness heterogeneity over the course of development and folding. These findings can help to elucidate the mechanics of the cortical folding process by clarifying the concurrent evolution of tissue properties.
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Affiliation(s)
- Christopher Walter
- Mechanical Engineering and Materials Science, Washington University, St. Louis, USA.
| | - Ramin Balouchzadeh
- Mechanical Engineering and Materials Science, Washington University, St. Louis, USA
| | - Kara E Garcia
- Radiology and Imaging Sciences, Indiana University School of Medicine, Evansville, IN, USA
| | - Christopher D Kroenke
- Advanced Imaging Research Center and Oregon National Primate Research Center Division of Neuroscience, Oregon Health and Science University, Portland, OR, USA
| | - Amit Pathak
- Mechanical Engineering and Materials Science, Washington University, St. Louis, USA
| | - Philip V Bayly
- Mechanical Engineering and Materials Science, Washington University, St. Louis, USA.
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Wood JK, Garcia KE, Carey RG. Increased Prevalence of Sensory Processing Issues in Pediatric Gastrointestinal Patient Population. Perm J 2022; 26:69-77. [PMID: 36446756 PMCID: PMC9761273 DOI: 10.7812/tpp/22.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Background Sensory processing dysfunction in children has been linked to attention-deficit/hyperactivity disorder, autism, feeding disorders, and functional abdominal pain. However, little is known about sensory processing in the broader pediatric gastroenterology population. Objective To characterize frequency and type of sensory processing dysfunction seen in pediatric gastroenterology compared to a general pediatric population. Methods The Short Sensory Profile 2 was administered to the parents of children ranging 3-14 years, being seen in a pediatric gastrointestinal (GI) subspecialty clinic or general pediatric clinic. Short Sensory Profile 2 scores from age- and gender-matched groups were compared with nonparametric statistics. Results Sensory processing dysfunction was increased in children seen in the GI clinic compared to children in the general pediatric clinic. Short Sensory Profile 2 quadrant analysis revealed greatest differences in avoiding, primarily in young females of the GI population. Conclusion Children presenting to a pediatric GI clinic demonstrate greater sensory processing dysfunction compared to children in a general pediatric practice.
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Affiliation(s)
- Jessica K Wood
- 1Forefront Therapy, Evansville, IN, USA,Jessica K Wood, OTD, OTR/L, BCP
| | - Kara E Garcia
- 2Department of Radiology & Imaging Sciences, Indiana University School of Medicine, Evansville, IN, USA
| | - Rebecca G Carey
- 3Division of Pediatric Gastroenterology, St. Vincent Hospital/Ascension, Peyton Manning Children’s Hospital, Evansville, IN, USA
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Garcia KE, Wang X, Kroenke CD. A model of tension-induced fiber growth predicts white matter organization during brain folding. Nat Commun 2021; 12:6681. [PMID: 34795256 PMCID: PMC8602459 DOI: 10.1038/s41467-021-26971-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 10/27/2021] [Indexed: 12/22/2022] Open
Abstract
The past decade has experienced renewed interest in the physical processes that fold the developing cerebral cortex. Biomechanical models and experiments suggest that growth of the cortex, outpacing growth of underlying subcortical tissue (prospective white matter), is sufficient to induce folding. However, current models do not explain the well-established links between white matter organization and fold morphology, nor do they consider subcortical remodeling that occurs during the period of folding. Here we propose a framework by which cortical folding may induce subcortical fiber growth and organization. Simulations incorporating stress-induced fiber elongation indicate that subcortical stresses resulting from folding are sufficient to induce stereotyped fiber organization beneath gyri and sulci. Model predictions are supported by high-resolution ex vivo diffusion tensor imaging of the developing rhesus macaque brain. Together, results provide support for the theory of cortical growth-induced folding and indicate that mechanical feedback plays a significant role in brain connectivity.
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Affiliation(s)
- Kara E Garcia
- Indiana University School of Medicine, Department of Radiology and Imaging Sciences, Evansville, IN, 47715, USA.
- Washington University in St. Louis, Department of Mechanical Engineering and Materials Science, St. Louis, MO, 63130, USA.
| | - Xiaojie Wang
- Oregon Health and Science University, Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR, 97006, USA
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Christopher D Kroenke
- Oregon Health and Science University, Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR, 97006, USA
- Advanced Imaging Research Center, Oregon Health and Science University, Portland, OR, 97239, USA
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Garcia KE, Stewart WG, Espinosa MG, Gleghorn JP, Taber LA. Molecular and mechanical signals determine morphogenesis of the cerebral hemispheres in the chicken embryo. Development 2019; 146:146/20/dev174318. [PMID: 31604710 DOI: 10.1242/dev.174318] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 07/30/2019] [Indexed: 01/16/2023]
Abstract
During embryonic development, the telecephalon undergoes extensive growth and cleaves into right and left cerebral hemispheres. Although molecular signals have been implicated in this process and linked to congenital abnormalities, few studies have examined the role of mechanical forces. In this study, we quantified morphology, cell proliferation and tissue growth in the forebrain of chicken embryos during Hamburger-Hamilton stages 17-21. By altering embryonic cerebrospinal fluid pressure during development, we found that neuroepithelial growth depends on not only chemical morphogen gradients but also mechanical feedback. Using these data, as well as published information on morphogen activity, we developed a chemomechanical growth law to mathematically describe growth of the neuroepithelium. Finally, we constructed a three-dimensional computational model based on these laws, with all parameters based on experimental data. The resulting model predicts forebrain shapes consistent with observations in normal embryos, as well as observations under chemical or mechanical perturbation. These results suggest that molecular and mechanical signals play important roles in early forebrain morphogenesis and may contribute to the development of congenital malformations.
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Affiliation(s)
- Kara E Garcia
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, St. Louis, MO 63130, USA
| | - Wade G Stewart
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, Newark, DE 19716, USA
| | - M Gabriela Espinosa
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, St. Louis, MO 63130, USA
| | - Jason P Gleghorn
- Department of Biomedical Engineering, University of Delaware, 150 Academy Street, Newark, DE 19716, USA
| | - Larry A Taber
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, St. Louis, MO 63130, USA
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Garcia KE, Kroenke CD, Bayly PV. Mechanics of cortical folding: stress, growth and stability. Philos Trans R Soc Lond B Biol Sci 2018; 373:rstb.2017.0321. [PMID: 30249772 DOI: 10.1098/rstb.2017.0321] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2018] [Indexed: 12/17/2022] Open
Abstract
Cortical folding, or gyrification, coincides with several important developmental processes. The folded shape of the human brain allows the cerebral cortex, the thin outer layer of neurons and their associated projections, to attain a large surface area relative to brain volume. Abnormal cortical folding has been associated with severe neurological, cognitive and behavioural disorders, such as epilepsy, autism and schizophrenia. However, despite decades of study, the mechanical forces that lead to cortical folding remain incompletely understood. Leading hypotheses have focused on the roles of (i) tangential growth of the outer cortex, (ii) spatio-temporal patterns in the birth and migration of neurons, and (iii) internal tension in axons. Recent experimental studies have illuminated not only the fundamental cellular and molecular processes underlying cortical development, but also the stress state, mechanical properties and spatio-temporal patterns of growth in the developing brain. The combination of mathematical modelling and physical measurements has allowed researchers to evaluate hypothesized mechanisms of folding, to determine whether each is consistent with physical laws. This review summarizes what physical scientists have learned from models and recent experimental observations, in the context of recent neurobiological discoveries regarding cortical development. Here, we highlight evidence of a combined mechanism, in which spatio-temporal patterns bias the locations of primary folds (i), but tangential growth of the cortical plate induces mechanical instability (ii) to propagate primary and higher-order folds.This article is part of the Theo Murphy meeting issue 'Mechanics of development'.
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Affiliation(s)
- K E Garcia
- Mechanical Engineering and Materials Science, Washington University in Saint Louis, Saint Louis, MO, USA.,Engineering, University of Southern Indiana, Evansville, IN, USA
| | - C D Kroenke
- Advanced Imaging Research Center, Oregon Health & Science University, Portland, OR, USA
| | - P V Bayly
- Mechanical Engineering and Materials Science, Washington University in Saint Louis, Saint Louis, MO, USA
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Garcia KE, Robinson EC, Alexopoulos D, Dierker DL, Glasser MF, Coalson TS, Ortinau CM, Rueckert D, Taber LA, Van Essen DC, Rogers CE, Smyser CD, Bayly PV. Dynamic patterns of cortical expansion during folding of the preterm human brain. Proc Natl Acad Sci U S A 2018; 115:3156-3161. [PMID: 29507201 PMCID: PMC5866555 DOI: 10.1073/pnas.1715451115] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [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] [Indexed: 01/22/2023] Open
Abstract
During the third trimester of human brain development, the cerebral cortex undergoes dramatic surface expansion and folding. Physical models suggest that relatively rapid growth of the cortical gray matter helps drive this folding, and structural data suggest that growth may vary in both space (by region on the cortical surface) and time. In this study, we propose a unique method to estimate local growth from sequential cortical reconstructions. Using anatomically constrained multimodal surface matching (aMSM), we obtain accurate, physically guided point correspondence between younger and older cortical reconstructions of the same individual. From each pair of surfaces, we calculate continuous, smooth maps of cortical expansion with unprecedented precision. By considering 30 preterm infants scanned two to four times during the period of rapid cortical expansion (28-38 wk postmenstrual age), we observe significant regional differences in growth across the cortical surface that are consistent with the emergence of new folds. Furthermore, these growth patterns shift over the course of development, with noninjured subjects following a highly consistent trajectory. This information provides a detailed picture of dynamic changes in cortical growth, connecting what is known about patterns of development at the microscopic (cellular) and macroscopic (folding) scales. Since our method provides specific growth maps for individual brains, we are also able to detect alterations due to injury. This fully automated surface analysis, based on tools freely available to the brain-mapping community, may also serve as a useful approach for future studies of abnormal growth due to genetic disorders, injury, or other environmental variables.
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Affiliation(s)
- Kara E Garcia
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130;
| | - Emma C Robinson
- Department of Computer Science, Imperial College London, London SW7 2AZ, United Kingdom
- Department of Biomedical Engineering, Division of Imaging Sciences, St. Thomas' Hospital, King's College London, London SE1 7EH, United Kingdom
- Department of Perinatal Imaging and Health, Division of Imaging Sciences, St. Thomas' Hospital, King's College London, London SE1 7EH, United Kingdom
| | - Dimitrios Alexopoulos
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110
| | - Donna L Dierker
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110
| | - Matthew F Glasser
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO 63110
- Internal Medicine, St. Luke's Hospital, St. Louis, MO 63017
| | - Timothy S Coalson
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO 63110
| | - Cynthia M Ortinau
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110
| | - Daniel Rueckert
- Department of Computer Science, Imperial College London, London SW7 2AZ, United Kingdom
| | - Larry A Taber
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO 63130
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130
| | - David C Van Essen
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO 63110
| | - Cynthia E Rogers
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110
| | - Christopher D Smyser
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110
| | - Philip V Bayly
- Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130
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Hosseini HS, Garcia KE, Taber LA. A new hypothesis for foregut and heart tube formation based on differential growth and actomyosin contraction. Development 2017; 144:2381-2391. [PMID: 28526751 DOI: 10.1242/dev.145193] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 05/10/2017] [Indexed: 01/14/2023]
Abstract
For decades, it was commonly thought that the bilateral heart fields in the early embryo fold directly towards the midline, where they meet and fuse to create the primitive heart tube. Recent studies have challenged this view, however, suggesting that the heart fields fold diagonally. As early foregut and heart tube morphogenesis are intimately related, this finding also raises questions concerning the traditional view of foregut formation. Here, we combine experiments on chick embryos with computational modeling to explore a new hypothesis for the physical mechanisms of heart tube and foregut formation. According to our hypothesis, differential anisotropic growth between mesoderm and endoderm drives diagonal folding. Then, active contraction along the anterior intestinal portal generates tension to elongate the foregut and heart tube. We test this hypothesis using biochemical perturbations of cell proliferation and contractility, as well as computational modeling based on nonlinear elasticity theory including growth and contraction. The present results generally support the view that differential growth and actomyosin contraction drive formation of the foregut and heart tube in the early chick embryo.
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Affiliation(s)
- Hadi S Hosseini
- Department of Biomedical Engineering, Washington University, St Louis, MO 63130, USA.,Department of Physics, Washington University, St Louis, MO 63130, USA
| | - Kara E Garcia
- Department of Biomedical Engineering, Washington University, St Louis, MO 63130, USA
| | - Larry A Taber
- Department of Biomedical Engineering, Washington University, St Louis, MO 63130, USA
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Garcia KE, Okamoto RJ, Bayly PV, Taber LA. Contraction and stress-dependent growth shape the forebrain of the early chicken embryo. J Mech Behav Biomed Mater 2017; 65:383-397. [PMID: 27639481 PMCID: PMC5260613 DOI: 10.1016/j.jmbbm.2016.08.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 04/08/2016] [Revised: 07/21/2016] [Accepted: 08/03/2016] [Indexed: 12/14/2022]
Abstract
During early vertebrate development, local constrictions, or sulci, form to divide the forebrain into the diencephalon, telencephalon, and optic vesicles. These partitions are maintained and exaggerated as the brain tube inflates, grows, and bends. Combining quantitative experiments on chick embryos with computational modeling, we investigated the biophysical mechanisms that drive these changes in brain shape. Chemical perturbations of contractility indicated that actomyosin contraction plays a major role in the creation of initial constrictions (Hamburger-Hamilton stages HH11-12), and fluorescent staining revealed that F-actin is circumferentially aligned at all constrictions. A finite element model based on these findings shows that the observed shape changes are consistent with circumferential contraction in these regions. To explain why sulci continue to deepen as the forebrain expands (HH12-20), we speculate that growth depends on wall stress. This idea was examined by including stress-dependent growth in a model with cerebrospinal fluid pressure and bending (cephalic flexure). The results given by the model agree with observed morphological changes that occur in the brain tube under normal and reduced eCSF pressure, quantitative measurements of relative sulcal depth versus time, and previously published patterns of cell proliferation. Taken together, our results support a biphasic mechanism for forebrain morphogenesis consisting of differential contractility (early) and stress-dependent growth (late).
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Affiliation(s)
- Kara E Garcia
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA.
| | - Ruth J Okamoto
- Department of Mechanical Engineering and Material Science, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA
| | - Philip V Bayly
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA; Department of Mechanical Engineering and Material Science, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA
| | - Larry A Taber
- Department of Biomedical Engineering, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA; Department of Mechanical Engineering and Material Science, Washington University, 1 Brookings Drive, Saint Louis, MO 63130, USA
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