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Alteration of the tight junction complex in renal epithelial cells can affect renal barrier function and perturb normal kidney homeostasis. The objective of the present study was to determine whether triptolide could affect tight junctions in the proximal tubule epithelial cells both in vivo and in vitro. Wistar rats were gavaged with triptolide at 0, 100, 200 or 400 μg/kg/day for 28 days. Pathologic examination of the kidney showed that triptolide primarily affected the proximal tubules. The nephrotoxicity of triptolide is morphologically characterized by the detachment of the proximal tubular epithelial cells from each other. Immunohistochemical analysis showed that there was marked alteration in the localization of Zonula Occludens 1 protein (ZO-1) in the proximal tubule epithelium. Additionally, the uptake of FITC-dextran, a marker of fluid phase endocytosis in the proximal tubule, was considerably lower in triptolide-treated animals than in normal rats. Supported by these results, we detected significant increases in blood urea nitrogen (BUN) but not of creatinine (Cr) in rats treated with triptolide, indicating damage to the proximal tubules. Furthermore, triptolide treatment caused an alteration of the tight junction complex, resulting in changes in paracellular permeability in NRK-52E cells in vitro. Taken together, these results suggest that triptolide induced renal toxicity in rats and that the mechanism of toxicity was related to the disruption of cell-cell junctions and alterations of the paracellular permeability in the proximal tubule.

Titel:	Triptolide alters barrier function in renal proximal tubular cells in rats.
Autor/in / Beteiligte Person:	Sun, L ; Li, H ; Huang, X ; Wang, T ; Zhang, S ; Yang, J ; Huang, S ; Mei, H ; Jiang, Z ; Zhang, L
Zeitschrift:	Toxicology letters, Jg. 223 (2013-10-23), Heft 1, S. 96-102
Veröffentlichung:	Amsterdam : Elsevier ; <i>Original Publication</i>: Amsterdam, Elsevier/North Holland., 2013
Medientyp:	academicJournal
ISSN:	1879-3169 (electronic)
DOI:	10.1016/j.toxlet.2013.08.014
Schlagwort:	Animals Blood Urea Nitrogen Blotting, Western Cell Line Creatinine blood Dextrans metabolism Epoxy Compounds toxicity Female Fluorescein-5-isothiocyanate analogs & derivatives Fluorescein-5-isothiocyanate metabolism Immunohistochemistry Kidney Tubules, Proximal metabolism Kidney Tubules, Proximal pathology RNA, Messenger chemistry RNA, Messenger genetics Random Allocation Rats Rats, Wistar Reverse Transcriptase Polymerase Chain Reaction Tight Junctions metabolism Tight Junctions pathology Zonula Occludens-1 Protein genetics Zonula Occludens-1 Protein metabolism Diterpenes toxicity Immunosuppressive Agents toxicity Kidney Tubules, Proximal drug effects Phenanthrenes toxicity Tight Junctions drug effects
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article; Research Support, Non-U.S. Gov't Language: English [Toxicol Lett] 2013 Oct 23; Vol. 223 (1), pp. 96-102. <i>Date of Electronic Publication: </i>2013 Sep 03. MeSH Terms: Diterpenes / toxicity ; Immunosuppressive Agents / toxicity ; Kidney Tubules, Proximal / drug effects ; Phenanthrenes / toxicity ; Tight Junctions / *drug effects ; Animals ; Blood Urea Nitrogen ; Blotting, Western ; Cell Line ; Creatinine / blood ; Dextrans / metabolism ; Epoxy Compounds / toxicity ; Female ; Fluorescein-5-isothiocyanate / analogs & derivatives ; Fluorescein-5-isothiocyanate / metabolism ; Immunohistochemistry ; Kidney Tubules, Proximal / metabolism ; Kidney Tubules, Proximal / pathology ; RNA, Messenger / chemistry ; RNA, Messenger / genetics ; Random Allocation ; Rats ; Rats, Wistar ; Reverse Transcriptase Polymerase Chain Reaction ; Tight Junctions / metabolism ; Tight Junctions / pathology ; Zonula Occludens-1 Protein / genetics ; Zonula Occludens-1 Protein / metabolism Contributed Indexing: Keywords: BUN; Cr; FBS; FITC; HE; Nephrotoxicity; Proximal tubule; TER; TJ; Tight junctions; Triptolide; blood urea nitrogen; creatinine; fetal bovine serum; fluorescein isothiocyanate; hematoxylin and eosin; tight junction; transepithelial resistance Substance Nomenclature: 0 (Dextrans) ; 0 (Diterpenes) ; 0 (Epoxy Compounds) ; 0 (Immunosuppressive Agents) ; 0 (Phenanthrenes) ; 0 (RNA, Messenger) ; 0 (Zonula Occludens-1 Protein) ; 0 (fluorescein isothiocyanate dextran) ; 19ALD1S53J (triptolide) ; AYI8EX34EU (Creatinine) ; I223NX31W9 (Fluorescein-5-isothiocyanate) Entry Date(s): Date Created: 20130907 Date Completed: 20140328 Latest Revision: 20161125 Update Code: 20240513

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Triptolide alters barrier function in renal proximal tubular cells in rats.