Cisplatin upregulates mitochondrial nitric oxide synthase and peroxynitrite formation to promote renal injury

• Published in: Toxicology and applied pharmacology Vol. 234; no. 2; pp. 236 - 246
• Main Authors: Jung, Michaela, Hotter, Georgina, Viñas, Jose Luis, Sola, Anna
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 15.01.2009; Elsevier
• Subjects: 60 APPLIED LIFE SCIENCES; Animals; Antineoplastic Agents - pharmacology; APOPTOSIS; Apoptosis - drug effects; Biological and medical sciences; Blotting, Western; Caspase 3 - metabolism; Cisplatin - pharmacology; Cisplatin nephrotoxicity; Coloring Agents; Cytochromes c - metabolism; Cytoskeleton; Cytoskeleton - drug effects; Cytoskeleton - ultrastructure; Immunohistochemistry; IN VITRO; IN VIVO; INJURIES; Kidney Diseases - chemically induced; Kidney Diseases - metabolism; Kidney Diseases - pathology; KIDNEYS; Male; MANGANESE OXIDES; Medical sciences; MICROTUBULES; MITOCHONDRIA; Mitochondria - drug effects; Mitochondria - enzymology; Mitochondrial nitric oxide synthase; Molsidomine - analogs & derivatives; Molsidomine - pharmacology; NITRIC OXIDE; Nitric Oxide - biosynthesis; Nitric Oxide Synthase - biosynthesis; Nitric Oxide Synthase Type I - biosynthesis; Nitric Oxide Synthase Type I - genetics; NITRITES; Peroxynitrite; Peroxynitrous Acid - metabolism; Phalloidine; Rats; Rats, Sprague-Dawley; Reverse Transcriptase Polymerase Chain Reaction; RNA, Messenger - biosynthesis; RNA, Messenger - genetics; TOXICITY; Toxicology; TRANSCRIPTION; Cytoskeleton; Peroxynitrite; Mitochondrial nitric oxide synthase; Cisplatin nephrotoxicity; Apoptosis; Antineoplastic agent; Kidney disease; Urinary system disease; Enzyme; Toxicity; Cisplatin; Nitric-oxide synthase; Kidney; Alkylating agent; Mitochondria; Urinary system; Cell death; Oxidoreductases; Lesion; Platinum II Complexes
• ISSN: 0041-008X; 1096-0333
• DOI: 10.1016/j.taap.2008.10.014

The mitochondria are a critical target for cisplatin-associated nephrotoxicity. Though nitric oxide formation has been implicated in the toxicity of cisplatin, this formation has not so far been related to a possible activation of mitochondrial nitric oxide synthase (mNOS). We show here that the upregulation of oxide mNOS and peroxynitrite formation in cisplatin treatment are key events that influence the development of the harmful parameters described in cisplatin-associated kidney failure. We confirm this by isolating the mitochondrial fraction of the kidney and across different access routes such as the use of a specific inhibitor of neuronal NOS, L-NPA, a peroxynitrite scavenger, FeTMPyP, and a peroxynitrite donor, SIN-1. The in vitro studies corroborated the information obtained in the in vivo experiments. The administration of cisplatin reveals a clear upregulation in the transcription of neuronal NOS and an increase in the levels of nitrites in the mitochondrial fractions of the kidneys. The upregulated transcription directly affects the cytoskeleton structure and the apoptosis. The inhibition of neuronal NOS reduces the levels of nitrites, cell death, and cytoskeleton derangement. Peroxynitrite is involved in the mechanism promoting the NOS transcription. In addition, in controls SIN-1 imitates the effects of cisplatin. In summary, we demonstrate that upregulation of mNOS in cisplatin treatment is a key component in both the initiation and the spread of cisplatin-associated damage in the kidney. Furthermore, peroxynitrite formation is directly involved in this process.