The molecular cues regulating the migratory process of LHRH neurons from the olfactory placode into the brain are not well known, but gradients of chemotropic and chemorepellent factors secreted by the targets are likely to play a key role in guidance mechanisms. Hepatocyte growth factor/scatter factor (HGF/SF) is a pleiotropic cytokine inducing cell migration. It is involved in a variety of developmental processes through interaction with its receptor c-Met. Here we show that c-Met-antibody labels LHRH migrating neurons in the olfactory mesenchyme of E12 mouse and analyze the potential chemotropic effect of HGF/SF on two immortalized LHRH cell lines, GT1-7 and GN11, isolated from tumors developed in the hypothalamus and in the olfactory bulb, respectively. By RT-PCR analysis, Western blotting, and immunocytochemistry, we provide evidence for a high level of c-Met expression in GN11, but not in GT1-7, cells. In addition, HGF/SF treatment promotes specific migratory activity of GN11 cells, as demonstrated by collagen gel assay, time-lapse video microscopy, and Boyden's chamber experiments. Such promotion is inhibited by the neutralizing antibody. The data reported here represent the first direct evidence of a chemotactic effect of HGF/SF on immortalized LHRH neurons.

Hepatocyte growth factor/scatter factor facilitates migration of GN-11 immortalized LHRH neurons / P. Giacobini, C. Giampietro, M. Fioretto, R. Maggi, A. Cariboni, I. Perroteau, A. Fasolo. - In: ENDOCRINOLOGY. - ISSN 0013-7227. - 143:9(2002 Sep), pp. 3306-3315.

Hepatocyte growth factor/scatter factor facilitates migration of GN-11 immortalized LHRH neurons

C. Giampietro;R. Maggi;A. Cariboni;
2002-09

Abstract

The molecular cues regulating the migratory process of LHRH neurons from the olfactory placode into the brain are not well known, but gradients of chemotropic and chemorepellent factors secreted by the targets are likely to play a key role in guidance mechanisms. Hepatocyte growth factor/scatter factor (HGF/SF) is a pleiotropic cytokine inducing cell migration. It is involved in a variety of developmental processes through interaction with its receptor c-Met. Here we show that c-Met-antibody labels LHRH migrating neurons in the olfactory mesenchyme of E12 mouse and analyze the potential chemotropic effect of HGF/SF on two immortalized LHRH cell lines, GT1-7 and GN11, isolated from tumors developed in the hypothalamus and in the olfactory bulb, respectively. By RT-PCR analysis, Western blotting, and immunocytochemistry, we provide evidence for a high level of c-Met expression in GN11, but not in GT1-7, cells. In addition, HGF/SF treatment promotes specific migratory activity of GN11 cells, as demonstrated by collagen gel assay, time-lapse video microscopy, and Boyden's chamber experiments. Such promotion is inhibited by the neutralizing antibody. The data reported here represent the first direct evidence of a chemotactic effect of HGF/SF on immortalized LHRH neurons.
Cell Movement; Animals; Microscopy, Video; Brain; Proto-Oncogene Proteins c-met; Mice; Reverse Transcriptase Polymerase Chain Reaction; Chemotaxis; Collagen; Brain Neoplasms; Blotting, Western; Tumor Cells, Cultured; Neurons; Hypothalamic Neoplasms; Gonadotropin-Releasing Hormone; Olfactory Bulb; Immunosorbent Techniques; Cell Line, Transformed; Time Factors; Hepatocyte Growth Factor; Immunohistochemistry; Olfactory Mucosa
Settore BIO/09 - Fisiologia
Settore BIO/13 - Biologia Applicata
Settore MED/04 - Patologia Generale
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/184339
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