Differential expression of Islet-1 in neural crest-derived ganglia: Islet-1 + dorsal root ganglion cells are post-mitotic and Islet-1 + sympathetic ganglion cells are still cycling.
The Islet-1 antigen is an early marker of differentiation of neural tube cells, and is expressed in many other embryonic cells as well. It had been reported that Islet-1 is expressed only in post-mitotic sympathetic neuroblasts in vitro, unlike other differentiation markers. We have double-labeled St. 23 chick embryos for bromodeoxyuridine (BrDU) and Islet-1 and found that neural tube and dorsal root ganglion (DRG) cells express Islet-1 after leaving the cell cycle, while sympathetic ganglion (SG) cells express Islet-1 while still dividing.
Avivi
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C
Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel.
Goldstein
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RS
D000818:Animals; D002453:Cell Cycle / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D002642:Chick Embryo; D005727:Ganglia, Spinal / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D005728:Ganglia, Sympathetic / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D018398:Homeodomain Proteins / Q000096:biosynthesis*; D060850:LIM-Homeodomain Proteins; D008938:Mitosis / Q000502:physiology*; D009419:Nerve Tissue Proteins; D009432:Neural Crest / Q000378:metabolism*; D014157:Transcription Factors
D018398:Homeodomain Proteins; D060850:LIM-Homeodomain Proteins; D009419:Nerve Tissue Proteins; D014157:Transcription Factors; C063843:insulin gene enhancer binding protein Isl-1