Quantitative and Qualitative Analysis of Transient Fetal Compartments during Prenatal Human Brain Development

Article Article scientifique Article Quantitative and Qualitative Analysis of Transient Fetal Compartments during Prenatal Human Brain Development eng 2016 author Vasung Lana 703514 author Lepage Claude 134788 author Radoš Milan author Pletikos Mihovil author Goldman Jennifer S author Richiardi Jonas 794625 author Raguž Marina author Fischi Gomez Elda 693464 author Karama Sherif author Hüppi Petra Susan 133591 author Evans Alan C author Kostovic Ivica 11 10.3389/fnana.2016.00011 26941612 1662-5129 The cerebral wall of the human fetal brain is composed of transient cellular compartments, which show characteristic spatiotemporal relationships with intensity of major neurogenic events (cell proliferation, migration, axonal growth, dendritic differentiation, synaptogenesis, cell death, and myelination). The aim of the present study was to obtain new quantitative data describing volume, surface area, and thickness of transient compartments in the human fetal cerebrum. Forty-four postmortem fetal brains aged 13-40 postconceptional weeks (PCW) were included in this study. High-resolution T1 weighted MR images were acquired on 19 fetal brain hemispheres. MR images were processed using in-house software (MNI-ACE toolbox). Delineation of fetal compartments was performed semi-automatically by co-registration of MRI with histological sections of the same brains, or with the age-matched brains from Zagreb Neuroembryological Collection. Growth trajectories of transient fetal compartments were reconstructed. The composition of telencephalic wall was quantitatively assessed. Between 13 and 25 PCW, when the intensity of neuronal proliferation decreases drastically, the relative volume of proliferative (ventricular and subventricular) compartments showed pronounced decline. In contrast, synapse- and extracellular matrix-rich subplate compartment continued to grow during the first two trimesters, occupying up to 45% of telencephalon and reaching its maximum volume and thickness around 30 PCW. This developmental maximum coincides with a period of intensive growth of long cortico-cortical fibers, which enter and wait in subplate before approaching the cortical plate. Although we did not find significant age related changes in mean thickness of the cortical plate, the volume, gyrification index, and surface area of the cortical plate continued to exponentially grow during the last phases of prenatal development. This cortical expansion coincides developmentally with the transformation of embryonic cortical columns, dendritic differentiation, and ingrowth of axons. These results provide a quantitative description of transient human fetal brain compartments observable with MRI. Moreover, they will improve understanding of structural-functional relationships during brain development, will enable correlation between in vitro/in vivo imaging and fine structural histological studies, and will serve as a reference for study of perinatal brain injuries. Dewey 618 58 Département de pédiatrie, gynécologie et obstétrique 223 false 150 L'imagerie cérébrale 184 Frontiers in Neuroanatomy 10 8d022ef8-b58f-49ff-9700-627e65c45326 Article (Published version) Public fnana-10-00011.pdf 4695871 application/pdf CC0 openAccess Faculté de médecine / Section de médecine clinique / Département de pédiatrie, gynécologie et obstétrique

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Quantitative and Qualitative Analysis of Transient Fetal Compartments during Prenatal Human Brain Development	Frontiers in Neuroanatomy			2016	491	321

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Lepage, Claude