Can aluminum, cesium, and platinum exposure impair mitochondrial function?

Exposure to heavy metals and metalloids can critically disrupt cellular bioenergetics, a process of heightened clinical relevance in older individuals. Experimental evidence delineates distinct direct and indirect pathways through which aluminum, platinum, and cesium impair mitochondrial integrity and function.

Direct mitochondrial toxicity of aluminum and platinum

• Aluminum-induced dysfunction: Research demonstrates that aluminum exposure directly inhibits mitochondrial respiratory chain complexes I, II, III, IV, and V (ATP synthase), alongside iron-dependent tricarboxylic acid (TCA) cycle enzymes. This leads to a loss of mitochondrial transmembrane potential ($\Delta\Theta_m$), increased membrane permeability, leakiness, and swelling, culminating in bioenergetic failure.
• Platinum-induced damage: Platinum compounds, such as cisplatin, directly uncouple oxidative phosphorylation and inhibit complexes I–IV, causing severe ATP depletion. This exposure alters membrane-associated calcium transport, triggers lipid peroxidation, and notably increases reactive oxygen species (ROS) generation via electron leaks in the damaged respiratory chain. Furthermore, platinum forms mitochondrial DNA (mtDNA) adducts that disrupt the proper assembly of respiratory complexes.

Mechanistic effects of cesium exposure

• Ionic disruption: Unlike the direct enzymatic inhibition caused by aluminum and platinum, cesium's impact is primarily indirect. Cesium acts as a potassium ($K^+$) analogue, competing for transport and blocking mitochondrial potassium channels.
• Structural alterations: This competitive inhibition disrupts mitochondrial ion homeostasis, which alters internal membrane volume and configuration. These structural changes subsequently impair myocardial respiration and oxidative phosphorylation.

Bottom line

• Aluminum and platinum act as potent, direct mitochondrial toxins that inhibit respiratory chain complexes, deplete ATP, and compromise membrane potential. Conversely, cesium's capacity to impair mitochondrial function is indirect, operating primarily through potassium transport competition and ionic imbalance.