Publication Date:
2015
abstract:
Microglialcellsparticipateinbraindevelopmentandinfluenceneuronallossandsynapticmaturation.Fractalkineisanimportantneuronalchemokinewhoseexpressionincreasesduringdevelopmentandthatcaninfluencemicrogliafunctionviathefractalkinereceptor,CX3CR1.MicelackingCx3cr1showavarietyofneuronaldefectsthoughttobetheresultofdeficientmicrogliafunction.ActivationofCX3CR1isimportantforthepropermigrationofmicrogliatositesofinjuryandintothebrainduringdevelopment.However,littleisknownabouthowfractalkinemodulatesmicroglialpropertiesduringdevelopment.Hereweexaminedmicroglialmorphology,responsetoATP,andK+currentpropertiesinacutebrainslicesfromCx3cr1knockoutmiceacrosspostnatalhippocampaldevelopment.Wefoundthatfractalkinesignalingisnecessaryforthedevelopmentofseveralmorphologicalandphysiologicalfeaturesofmicroglia.Specifically,wefoundthattheoccurrenceofanoutwardrectifyingK+current,typicalofactivatedmicroglia,thatpeakedduringthesecondandthirdpostnatalweek,wasreducedinCx3cr1knockoutmice.FractalkinesignalingalsoinfluencedmicroglialmorphologyandabilitytoextendprocessesinresponsetoATPfollowingitsfocalapplicationtotheslice.Ourresultsrevealthedevelopmentalprofileofseveralmorphologicalandphysiologicalpropertiesofmicrogliaanddemonstratethattheseprocessesaremodulatedbyfractalkinesignaling.
Iris type:
01.01 Articolo in rivista
Keywords:
potassium currents; rearrangement; development; fractalkine; CX3CR1; microglia
List of contributors:
Cortese, Barbara; Pagani, Francesca
Published in: