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These studies will help define and interpret patterns of gene expression, waves of differentiation, timing and extent of competence, and many other processes involved.
Indeed, the spatial and temporal development of GABA immunoreactivity has been studied in the embryonic rat (Ma et al., 1992; Tran and Phelps, 2000; Tran et al., 2003) and mouse spinal cord (Allain et al., 2004; Huang et al., 2007) both in vivo and in vitro.
Despite the abundance of studies on γ-aminobutyric acid (GABA) ergic neuron distribution in the mouse developing spinal cord, no investigation has been devoted so far to their birthdates.
In order to determine the spinal neurogenesis of a specific phenotype, the GABAergic neurons in the spinal cord, we injected bromodeoxyuridine (Brd U) at different developmental stages of the glutamic acid decarboxylase (GAD)-green fluorescent protein (GFP) knock-in mice.
Timed-pregnant mice were given an intraperitoneal injection of Brd U (Sigma, St. doi: 10.1159/000017445 Pubmed Abstract | Pubmed Full Text | Cross Ref Full Text Yozu, M., Tabata, H., and Nakajima, K. Birth-date dependent alignment of GABAergic neurons occurs in a different pattern from that of non-GABAergic neurons in the developing mouse visual cortex. Yun-Qing Li and Sheng-Xi Wu, Department of Anatomy, Histology and Embryology, K. Leung Brain Research Centre, Fourth Military Medical University, No.
Louis, MO, USA; 50 mg/kg body weight), a marker of cell proliferation, at E10.5, E11.5, E12.5, E13.5, E14.5, E15.5, E16.5, and E17.5.
This strategy enabled us to obtain data regarding the generation timetable, migration profile, and final position of GABAergic neurons incorporating Brd U during their last mitosis.
To better understand the role of GABAergic neurons in spinal cord, the expression pattern and time course of generation of the major cell types need to be established.GAD-GFP knock-in fetuses could easily be distinguished from the wild type under the detection of fluorescence at the microscope. doi: 10.1016/j.neures.20 Pubmed Abstract | Pubmed Full Text | Cross Ref Full Text Huang J, Chen J, Wang W, Wei Y-Y, Cai G-H, Tamamaki N, Li Y-Q and Wu S-X (2013) Birthdate study of GABAergic neurons in the lumbar spinal cord of the glutamic acid decarboxylase 67-green fluorescent protein knock-in mouse. The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice.Experimental mice were housed and treated in strict accordance with the Rules for Animal Care and Use for Research and Education of Fourth Military Medical University. No use, distribution or reproduction is permitted which does not comply with these terms.We use this strategy to determine the age of cells in the cortex of the adult human brain and show that whereas nonneuronal cells are exchanged, occipital neurons are as old as the individual, supporting the view that postnatal neurogenesis does not take place in this region.Retrospective birth dating is a generally applicable strategy that can be used to measure cell turnover in man under physiological and pathological conditions.