Consulta: subjectFacets:"Cell activation"
Registros recuperados: 2
Data/hora: 08/06/2024 18:20:09

Marine fish spermatozoa: racing ephemeral swimmers
Provedor de dados: 5
Autores: Cosson, J; Groison, A; Suquet, Marc; Fauvel, Christian; Dreanno, Catherine; Billard, R.
After along period of spermatogenesis (several weeks to months), marine fish spermatozoa are delivered at male spawning in seawater (SW) at the same time as ova. In some fish species, as the ova micropyle closes quickly after release, these minute unicells, the spermatozoa, have to accomplish their task of reaching the micropyle within a very brief period (several seconds to minutes), for delivery of the haploid male genetic information to the ova. To achieve this goal, their high-performance motile equipment, the flagellum, must fully activate immediately on contact with the SW and then propel the sperm cell at an unusually high initial velocity. The cost of such 'hyperactivity' is a very rapid consumption of intracellular ATP that outstrips the supply....
Tipo: Text
Palavras-chave: Cell activation; Osmolality; Ions; Cell energetics; Motility; Spermatozoon; Marine fish.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6967.pdf

Microglia ­ astrocyte interaction in Alzheimer's disease: friends or foes for the nervous system?
Provedor de dados: 48
Autores: VON BERNHARDI,ROMMY; RAMIREZ,GIGLIOLA.
Brain glial cells secrete several molecules that can modulate the survival of neurons after various types of damage to the CNS. Activated microglia and astrocytes closely associate to amyloid plaques in Alzheimer Disease (AD). They could have a role in the neurotoxicity observed in AD because of the inflammatory reaction they generate. There is controversy regarding the individual part played by the different glial cells, and the interrelationships between them. Both astrocytes and microglia produce several cytokines involved in the inflammatory reaction. Moreover, the same cytokines may have different effects, depending on their concentration and the type of cells in the vicinity. In turn, the events occurring in response to injury may lead to changes in...
Tipo: Journal article
Palavras-chave: Apoptosis; SS-amyloid; Cell activation; Inflammatory process; Neurotoxicity; Senile plaques.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200017