1995;64:1937C1944
1995;64:1937C1944. guiding nonradial cell migration, we injected a replication-defective retroviral vector utilized for lineage tracing followed by a DM-GRASP blocking antibody. Embryos injected with the blocking antibody showed a near total block in nonradial cell migration specifically where DM-GRASP is usually expressed. Furthermore, morphological analyses revealed disruption of the normal architecture of the diencephalon indicating nonradial cell migration is necessary for normal morphological development of the brain. Our data show that DM-GRASP is necessary for nonradial cell migration in the chick diencephalon and have provided a system to further explore the function of nonradial cell migration during CNS development. Keywords: nonradial cell migration, tangential cell migration, DM-GRASP/BEN, diencephalon, chick, CNS One of the remarkable features of CNS development is the considerable cell migration that occurs from the site where progenitor cells reside to where a postmitotic, terminally differentiated cell resides in the mature brain. Neurons and glia are derived predominately from progenitor cells located adjacent to the lumen of the neural tube. These regions, known as the ventricular zone (VZ) and subventricular zone (SVZ), are composed of proliferating cells. The two child cells resulting from a cell division may each re-enter the cell cycle, one may re-enter the cell cycle and the other may leave the cell cycle, or both may exit the cell cycle. Those cells that exit the cell cycle begin differentiation. (-)-Epigallocatechin gallate As cells differentiate, they also migrate away from their site of birth to where they will reside in the mature nervous system. Two major pathways of (-)-Epigallocatechin gallate cell migration have been recognized during early development; radial, from your ventricular zone out toward the surface of the neural tube, and nonradial or tangential, which is usually parallel to the surface of the neural tube. Radial migration was the first pathway of migration to be identified and subsequently is the best characterized. Radial cell migration is also known as glial-guided cell migration because the neuroblasts migrate along specialized glial cells known as a radial glia (Rakic, 1990; for review, observe Hatten, 1999).and studies of radial cell migration have identified a number of molecules that participate in this pathway of migration. These molecules fall into several broad groups, including extracellular matrix molecules (Husmann et al., 1992; Fishman and Hatten, 1993), cell surface molecules (including receptors, ligands, and cell adhesion molecules) (Stitt and Hatten, 1990; Fishell and Hatten, 1991; Asou et Mouse monoclonal to EGF al., 1992; Grumet, 1992;Fishman and Hatten, 1993; Komuro and Rakic, 1993, 1996; Mittal and David, 1994; Ono et al., 1994; Thomaidou et al., 1995; Anton et al., 1996; Zheng et al., 1996; Anton et al., 1997; Rio et al., 1997), secreted molecules, and molecules with putative functions in transmission transduction (Anton et al., 1997; Rio et al., 1997). In contrast to radial cell migration, relatively little is known about the guidance of nonradial (also defined as tangential) cell migration. Nonradial cell migration has been observed at virtually every (-)-Epigallocatechin gallate level of the developing nervous (-)-Epigallocatechin gallate system including the spinal cord (Leber et al., 1990; Phelps et al., 1996), hindbrain (Baehr et al., 1988; Bourrat and Sotelo, 1988; Leber et al., 1990; Marin and Puelles, 1995; Ono and Kawamura, 1989; Phelps et al., 1996), cerebellum (Ryder and Cepko, 1994), midbrain (Gray and Sanes, 1991; Martinez et al., 1992), diencephalon (Golden and Cepko, 1996; Golden et al., 1997), and telencephalon (Austin and Cepko, 1990; Halliday and Cepko, 1992; Walsh and Cepko, 1992; Fishell et al., 1993; O’Rourke et al., 1995, 1996, 1997; Szele and Cepko, 1996, 1998; Anderson et al., 1997; Tan et al., 1998). Furthermore, clonal analysis and cell labeling studies indicate that a significant percentage of cells move along tangential pathways during development. For example, up to 40% of clones in the chick diencephalon showed nonradial dispersion.