title: Mitochondrial/lysosomal toxic cross-talk plays a key role in cisplatin nephrotoxicity.
abstract: Cisplatin is widely used chemotherapeutic agent for the treatment of several human malignancies. Dose-related nephrotoxicity is the major adverse effect of cisplatin. The cellular and molecular mechanisms behind the cisplatin nephrotoxicity have not yet been completely understood. In this study, cytotoxic effect of cisplatin on renal proximal tubular (RPT) cells was evaluated. Our results showed that cytotoxic action of cisplatin on RPT cells is mediated by reactive oxygen species (ROS) formation, decline of mitochondrial membrane potential, increase in caspase-3 activity and lysosomal membrane leakiness before cell lysis ensued. All of the above mentioned cisplatin-induced oxidative stress cytotoxicity markers were significantly (p&#x2009;&lt;&#x2009;0.05) prevented by ROS scavengers, antioxidants, mitochondrial permeability transition (MPT) pore sealing agents, endocytosis inhibitors and adenosine triphosphate (ATP) generators. Our results also showed that CYP2E1 involves in cisplatin oxidative stress cytotoxicity mechanism and intracellular nitric oxide enhancement protects the RPT cells against the cisplatin-induced cytotoxicity. It seems that cisplatin nephrotoxicity is associated with mutual mitochondrial/lysosomal potentiation (cross-talk) of oxidative stress in RPT cells. This cross-talk finally results in release of lysosomal digestive proteases and phospholipases and mitochondrial MPT pore opening leading to cytochrome c release and activation of caspases cascade which signal apoptosis.
authors.affiliation: Faculty of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran. j.pourahmadjaktaji@utoronto.ca
authors.forename: Jalal
authors.initials: J
authors.lastname: Pourahmad
authors.forename: Mir-Jamal
authors.initials: MJ
authors.lastname: Hosseini
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Eskandari
authors.forename: Seyed Mohammad
authors.initials: SM
authors.lastname: Shekarabi
authors.forename: Bahram
authors.initials: B
authors.lastname: Daraei
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000633:toxicity*; D053148:Caspase 3 / Q000378:metabolism; D002478:Cells, Cultured; D002945:Cisplatin / Q000633:toxicity*; D007674:Kidney Diseases / Q000139:chemically induced* / Q000378:metabolism; D007687:Kidney Tubules, Proximal / Q000187:drug effects / Q000378:metabolism; D008247:Lysosomes / Q000187:drug effects; D008297:Male; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects*; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism*; D020239:Receptor Cross-Talk / Q000187:drug effects
chemical_list: D000970:Antineoplastic Agents; D017382:Reactive Oxygen Species; D053148:Caspase 3; D002945:Cisplatin