Étude expérimentale de la différenciation des cellules de l'éponge au cours de son développement
[摘要] Theprincipalcelltypesofthefree-swimminglarvaofMycalecontarenii(Martens)arecitedandtheirdistributioninthelarvaisdescribed.Bytheexcisionofdifferentpartsofthelarva,culturesoflarvalcellsareobtainedwithonecell-typeeithergreatlypreponderantorentirelyabsent.Theculturesofthecentralpartofthelarvacontainalargenumberofarchaeocytesandcollencytes,buttheydonotcontainanycellsofthelarvalciliatedepithelium.Thearchaeocytesformsmallgroupswhichdifferentiateprogressivelyintochoanoblastsandchoanocytes.Thefunctionalspongeisobtained3–4daysafterthebeginningoftheexperiment.Theculturesofthelarvalciliaryepithelium,containingalsoacertainnumberofcollencytesandsomearchaeocytes,transformrapidlyintoagreatnumberofnormalflagellatechambers.Epithelialcellsthatarenotincludedinchamberscytolyze.Itisconcludedthattheciliaryepithelialcellsformtheflagellatechambersinthecourseofthenormaldevelopmentofthespongeandthisistheiruniquecapacity.Theconstructionofthethreedimensionalstructure,necessaryforthecellorganization,isduetotheactivityofthecollencytes;thepinacocytescannotreplacecollencytesinthisprocess.Archaeocytescandifferentiatebothintothechoanocytesandintothecollencytes,sotheyaretotipotent.Celldifferentiationduringthemorphogenesisanddevelopmentofspongesisdiscussed.
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[效力级别] [学科分类] 生物科学（综合）
[关键词] [时效性]
