Silver has been used for years in medicine; it has known antimicrobial properties. Additionally, silver has been used in water and air filtration to eliminate microorganisms, and, more recently, as a biocide to prevent infections in burns. In contact with the human body, nanoparticles can elicit a spectrum of tissue responses such as the generation of reactive oxygen species, decreased function of mitochondria and even cell death. Mitochondries are intracellular organelles that play a crucial role in ATP production. In the present work, we evaluate the in vitro effect of silver nanoparticles (AgN) on the activities of mitochondrial respiratory chain complexes from the brain, skeletal muscle, heart, and liver of rats. Our results demonstrated that AgN (10, 25, and 50 mg l(-1)) decreases the activity of mitochondrial respiratory chain complexes I, II, III, and IV from all tissues.

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