Scientists have developed a safe method for controlling mitochondria—cellular organelles responsible for producing energy. Chemists have created molecules that prompt mitochondria to burn some of the cell’s organic fuel without storing the resulting energy, which helps reduce fat accumulation in cells.

How Mitochondria Work

Mitochondria function like miniature hydroelectric power plants: they pump protons across a membrane, generating a voltage that is then used to synthesize cellular energy—ATP. As early as the 1930s, doctors discovered that this voltage could be artificially dissipated using the compound 2,4-dinitrophenol (DNP). The body would then rapidly burn fat reserves to restore the charge, causing patients to lose weight quickly. However, the drug was banned due to its uncontrollable effects: it converted energy into heat too intensely, leading to dangerous overheating and even death. Pharmacologists have since sought a gentler and more controlled approach.

New Molecules for Mitochondrial Control

In a study published in the journal Chemical Science, researchers synthesized a series of new compounds—fatty acids with an arylamide “tail.” They altered the positions of chlorine and fluorine atoms in the molecule’s ring, shifting them by just one position (from 3,5 to 3,4), and tested their effects on cell cultures. Nuclear magnetic resonance and computer modeling were used to analyze how the molecules interacted, and the rate of proton leakage through artificial membranes was measured.

The Importance of Molecular Configuration

It turned out that even a slight change in the position of atoms completely altered the properties of the substance. Compounds with a 3,5 configuration acted as classic toxins, completely blocking energy synthesis and killing cells. In contrast, molecules with a 3,4 configuration (compounds 5b and 6b) behaved differently: they increased oxygen consumption, but ATP levels remained normal and the cells survived.

Why the New Molecules Are Safer

The secret lies in the “awkwardness” of the new molecules. For a proton to cross the fatty membrane, two drug molecules must pair up. Due to their altered geometry, the safer molecules do this poorly and infrequently. This chemical limitation slows the rate of proton transfer to a level that the cell can handle without harm.

The Significance of the Discovery for Medicine

For the first time, it has been proven that the safety of a metabolic drug directly depends on the rate of proton transport. This discovery gives pharmaceutical scientists a new principle for drug design: to develop effective treatments for obesity and diabetes, it is necessary to create molecules that act “slowly and inefficiently,” without turning the body into a furnace.