PMID- 19365092 OWN - NLM STAT- MEDLINE DCOM- 20090831 LR - 20211020 IS - 0022-1554 (Print) IS - 1551-5044 (Electronic) IS - 0022-1554 (Linking) VI - 57 IP - 8 DP - 2009 Aug TI - Apoptosis and desquamation of urothelial cells in tissue remodeling during rat postnatal development. PG - 721-30 LID - 10.1369/jhc.2009.953349 [doi] AB - Postnatal rat urothelium was studied from day 0 to day 14, when intense cell loss as part of tissue remodeling was expected. The morphological and biochemical characteristics of urothelial cells in the tissue and released cells were investigated by light and electron microscopy, by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay, by annexin V/propidium iodide assay, and by immunofluorescent detection of active caspases and tight-junction protein occludin. Intense apoptosis and massive desquamation were detected between postnatal days 7 and 10. During this period, active caspases and TUNEL-positive cells were found in the urothelium. Disassembled cell-cell junctions were detected between cells. The majority of desquamated cells expressed no apoptotic cell morphology, but were active caspase positive and TUNEL positive. Ann+/PI- apoptotic bodies and desquamated Ann+/PI+ cells were detected in the lumen. These results indicate that apoptosis and desquamation participate in urothelial cell loss in the rat early postnatal period, indispensable for fast urothelial remodeling during development. FAU - Erman, Andreja AU - Erman A AD - Institute of Cell Biology, Faculty of Medicine, Lipiceva 2, 1000 Ljubljana, Slovenia. andreja.erman@mf.uni-lj.si FAU - Zupancic, Dasa AU - Zupancic D FAU - Jezernik, Kristijan AU - Jezernik K LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20090413 PL - United States TA - J Histochem Cytochem JT - The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society JID - 9815334 RN - 0 (Membrane Proteins) RN - 0 (Occludin) RN - 0 (Ocln protein, rat) RN - EC 3.4.22.- (Caspases) SB - IM MH - Animals MH - Animals, Newborn MH - *Apoptosis MH - Caspases/metabolism MH - Epithelial Cells/*cytology/ultrastructure MH - Female MH - Male MH - Membrane Proteins/metabolism MH - Occludin MH - Rats MH - Rats, Wistar MH - Tight Junctions/metabolism/ultrastructure MH - Urinary Bladder/cytology/growth & development/metabolism MH - Urothelium/*cytology/*growth & development/metabolism PMC - PMC2713072 EDAT- 2009/04/15 09:00 MHDA- 2009/09/01 06:00 PMCR- 2009/08/01 CRDT- 2009/04/15 09:00 PHST- 2009/04/15 09:00 [entrez] PHST- 2009/04/15 09:00 [pubmed] PHST- 2009/09/01 06:00 [medline] PHST- 2009/08/01 00:00 [pmc-release] AID - jhc.2009.953349 [pii] AID - 953349 [pii] AID - 10.1369/jhc.2009.953349 [doi] PST - ppublish SO - J Histochem Cytochem. 2009 Aug;57(8):721-30. doi: 10.1369/jhc.2009.953349. Epub 2009 Apr 13.