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首页> 外文期刊>Developmental biology >Assembly of contractile and cytoskeletal elements in developing smooth muscle cells☆
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Assembly of contractile and cytoskeletal elements in developing smooth muscle cells☆

机译:发育中的平滑肌细胞中收缩和细胞骨架成分的组装☆

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Specificdevelopmentalchangesinsmoothmusclewerestudiedingizzardsobtainedfrom6-,8-,10-,12-,14-,16-,18-,and20-daychickembryosandfrom1-and7-dayposthatchchicks.Myoblastswereactivelyreplicatingintissuefrom6-dayembryos.Cytoplasmicdensebodies(CDBs)firstappearedatEmbryonicDay8(E8)andwererecognizedaspatchesofincreasedelectrondensitythatconsistedofactinfilaments(AFs),intermediatefilaments(IFs),andcross-connectingfilaments(CCFs).AlthoughtheassemblyofCDBswasnotsynchronizedwithinacell,thenumber,size,andelectrondensityofCDBsincreasedasageincreased.Membrane-associateddensebodies(MADBs)alsocouldberecognizedatE8.ThenumberandsizeofMADBsincreasedasageincreased,especiallyafterE16.FilamentswiththediameterofthickfilamentsfirstappearedatE12.SmoothmusclecellswereabletodivideaslateasE20.Theaxialintermediatefilamentbundle(IFB)couldfirstbeidentifiedin1-dayposthatchcellsandbecamelargerandmoreprominentin7-dayposthatchcells.Immunogoldlabelingof1-and7-dayposthatchcellswithanti-desminshowedthattheIFBcontaineddesminIFs.Thedevelopmentaleventsduringthis23-dayperiodwereclassifiedintosevenstages,basedprimarilyontheappearanceandthegrowthofcontractileandcytoskeletalelements.Thesestagesaremyoblastproliferation,densebodyappearance,thickfilamentappearance,densebodygrowth,musclecellreplication,IFBappearance,andappearanceofadulttypecells.Smoothmusclecellsineachstageexpresssimilardevelopmentalcharacteristics.Themechanismofassemblyofmyofilamentsandcytoskeletalelementsinsmoothmuscleinvivoindicatesthatmyofilaments(AFsandthickfilaments)andfilamentattachmentsites(CDBsandMADBs)areassembledbeforetheaxialIFB,amajorcytoskeletalelement.
机译:Specificdevelopmentalchangesinsmoothmusclewerestudiedingizzardsobtainedfrom6-,8-,10-,12-,14-,16-,18-,and20-daychickembryosandfrom1-和7-dayposthatchchicks.Myoblastswereactivelyreplicatingintissuefrom6-dayembryos.Cytoplasmicdensebodies(的CDB)firstappearedatEmbryonicDay8(E8)andwererecognizedaspatchesofincreasedelectrondensitythatconsistedofactinfilaments(AFS),intermediatefilaments(IFS) ,andcross-connectingfilaments(国家合作框架).AlthoughtheassemblyofCDBswasnotsynchronizedwithinacell,数量写,大小,andelectrondensityofCDBsincreasedasageincreased.Membrane-associateddensebodies(MADBs)alsocouldberecognizedatE8.ThenumberandsizeofMADBsincreasedasageincreased,especiallyafterE16.FilamentswiththediameterofthickfilamentsfirstappearedatE12.SmoothmusclecellswereabletodivideaslateasE20.Theaxialintermediatefilamentbundle(IFB)couldfirstbeidentifiedin1-dayposthatchcellsandbecamelargerandmoreprominentin7-dayposthatchcells.Immunogoldlabelingof1-和7-dayposthatchcellswithanti-desminshowedthattheIFBcontaineddesminIFs .Thedevelopmentaleventsduringthis23-dayperiodwereclassifiedintosevenstages,basedprimarilyontheappearanceandthegrowthofcontractileandcytoskeletalelements.Thesestagesaremyoblastproliferation,densebodyappearance,thickfilamentappearance,densebodygrowth,musclecellreplication,IFBappearance,andappearanceofadulttypecells.Smoothmusclecellsineachstageexpresssimilardevelopmentalcharacteristics.Themechanismofassemblyofmyofilamentsandcytoskeletalelementsinsmoothmuscleinvivoindicatesthatmyofilaments(AFsandthickfilaments)andfilamentattachmentsites(CDBsandMADBs)areassembledbeforetheaxialIFB​​,amajorcytoskeletalelement。

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