title: Conditioned medium from mesenchymal stem cells induces cell death in organotypic cultures of rat hippocampus and aggravates lesion in a model of oxygen and glucose deprivation.
abstract: Cell therapy using bone marrow-derived mesenchymal stem cells (MSC) seems to be a new alternative for the treatment of neurological diseases, including stroke. In order to investigate the response of hippocampal tissue to factors secreted by MSC and if these factors are neuroprotective in a model of oxygen and glucose deprivation (OGD), we used organotypic hippocampal cultures exposed to conditioned medium from bone marrow-derived MSC. Our results suggest that the conditioned medium obtained from these cells aggravates lesion caused by OGD. In addition, the presence of the conditioned medium alone was toxic mainly to cells in the CA1, CA2 and CA3 areas of the hippocampal organotypic culture even in basal conditions. GABA stimulation and NMDA and AMPA receptors antagonists were able to reduce propidium iodide staining, suggesting that the cell death induced by the toxic factors secreted by MSC could involve these receptors.
authors.affiliation: Programa de Pós Graduação em Ciências Biológicas, Bioquímica, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Rua Ramiro Barcelos 2600, 90035.003 Porto Alegre, RS, Brazil.
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Horn
authors.forename: Rudimar Luiz
authors.initials: RL
authors.lastname: Frozza
authors.forename: Patrícia Benke
authors.initials: PB
authors.lastname: Grudzinski
authors.forename: Daniéli
authors.initials: D
authors.lastname: Gerhardt
authors.forename: Juliana Bender
authors.initials: JB
authors.lastname: Hoppe
authors.forename: Alessandra Nejar
authors.initials: AN
authors.lastname: Bruno
authors.forename: Pedro
authors.initials: P
authors.lastname: Chagastelles
authors.forename: Nance Beyer
authors.initials: NB
authors.lastname: Nardi
authors.forename: Guido
authors.initials: G
authors.lastname: Lenz
authors.forename: Christianne
authors.initials: C
authors.lastname: Salbego
mesh_terms: D000818:Animals; D016923:Cell Death / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D017077:Culture Media, Conditioned / Q000633:toxicity*; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D018698:Glutamic Acid / Q000378:metabolism; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D020925:Hypoxia-Ischemia, Brain / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy*; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000009:adverse effects*; D059630:Mesenchymal Stem Cells / Q000378:metabolism*; D009410:Nerve Degeneration / Q000139:chemically induced* / Q000378:metabolism / Q000503:physiopathology; D009924:Organ Culture Techniques; D011419:Propidium; D051381:Rats; D017208:Rats, Wistar; D018091:Receptors, AMPA / Q000187:drug effects / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000378:metabolism / Q000494:pharmacology
chemical_list: D017077:Culture Media, Conditioned; D018691:Excitatory Amino Acid Antagonists; D018091:Receptors, AMPA; D016194:Receptors, N-Methyl-D-Aspartate; D011419:Propidium; D018698:Glutamic Acid; D005680:gamma-Aminobutyric Acid