Neuronal differentiation of chromaffin cells in vitro, induced by extremely low frequency magnetic fields or nerve growth factor: A histological and ultrastructural comparative study
Por:
Feria-Velasco A., Castillo-Medina S., Verdugo-Díaz L., Castellanos E., Orozco-Suárez S., Sánchez-Gómez C., Drucker-Colín R.
Publicada:
1 ene 1998
Resumen:
The application of nerve growth factor (NGF) to primary adrenal medulla chromaffin cell cultures induces phenotypic changes characterized mainly by the presence of neurites. A similar effect has been seen when these cells are stimulated by extremely low frequency magnetic fields (ELFMF). In this study, newborn rat chromaffin cells were cultured and subjected to NGF or ELFMF in order to compare their histological and ultrastructural characteristics. Cells cultured in the presence of NGF developed cytoplasmic projections and their distal ends showed growth cones as well as filopodia. With scanning and transmission electron microscopy, an increased submembranous electron density was observed in the nuclei of cells as well as irregular, wavy neuritic projections with a moderate number of varicosities, as well as the prevalence of intermediate filaments among the cytoskeleton components. Cells stimulated with ELFMF presented straighter neuritic extensions with a greater number of varicosities. With the transmission electron microscope, numerous neurotubules were observed, both in the cell soma and in their neuritic extensions. In both groups, growth cones were clearly identified by their ultrastructural characteristics. The differences seen in the cytoskeleton of cells stimulated with NGF or ELFMF suggest differential stimulation mechanisms possibly determining the biochemical, electrophysiological, and morphological characteristics in both types of cell cultures.
Filiaciones:
Feria-Velasco A.:
Div. Biotecnologia y Patol. Medio A., CIATEJ (SEP-CONACYT), Guadalajara, Jalisco, Mexico
Castillo-Medina S.:
U. Invest. Medica Enferm. O., Hospital de Oncología, Ctro. Médico Nac. Siglo XXI, México, D.F., Mexico
Verdugo-Díaz L.:
Departamento de Fisiología, Facultad de Medicina, Inst. de Fisiología Celular, México, D.F., Mexico
Castellanos E.:
U. Invest. Medica Enferm. O., Hospital de Oncología, Ctro. Médico Nac. Siglo XXI, México, D.F., Mexico
Orozco-Suárez S.:
U. Invest. Medica Enferm. N., Hospital de Especialidades, Ctro. Médico Nac. Siglo XXI, México, D.F., Mexico
Sánchez-Gómez C.:
Depto. Biol. Desarrollo y T., Hosp. Inf. Mex. Dr. Federico Gomez, SSA, México, D.F., Mexico
Drucker-Colín R.:
Departamento de Fisiología, Facultad de Medicina, Inst. de Fisiología Celular, México, D.F., Mexico
Departamento de Neurociencias, Inst. de Fisiología Celular, UNAM, México, D.F., Mexico
Depto. de Fisiología, Facultad de Medicina, UNAM, Apdo. Postal 70-250, 04510 México, D.F., Mexico
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