title: GFAP expression withdraws--a trend of glial evolution?
abstract: This study is a summary of investigations in the last decade with several collaborators on representatives of different vertebrate stocks. The results suggest that in the main vertebrate stocks (Agnathi, Chondrichthyes, Actinopterygii, Sarcopterygii-Amniotes), which had their parallel brain evolutions from the laminar brains to the elaborated ones, the astroglia also developed in parallel, and had a common trend of evolution. With growing brain complexity, free astrocytes arose and tended to predominate, and the spontaneous glial fibrillary acidic protein (GFAP)-expression regressed, in several areas. In the mammalian, avian, teleost, and batoid brains, therefore, large areas display a paucity, almost a lack of GFAP-immunoreactivity. The GFAP-expression in the GFAP-free areas seems to be inducible only in the presence of free astrocytes.
authors.affiliation: Department of Anatomy, Histology and Embryology, Semmelweis University, Budapest, Hungary. kalman@ana1.sote.hu
authors.forename: Mihály
authors.initials: M
authors.lastname: Kálmán
mesh_terms: D000818:Animals; D001253:Astrocytes / Q000502:physiology*; D005075:Biological Evolution; D001921:Brain / Q000378:metabolism*; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism*; D014714:Vertebrates / Q000502:physiology
chemical_list: D005904:Glial Fibrillary Acidic Protein