3,5-Diiodo-L-thyronine (3,5-T2) vs Alagebrium (ALT-711)

Metabolic

Metabolic

Research Only

Research Only

3,5-T2 acts largely independently of classical nuclear thyroid hormone receptor (THRβ) genomic signaling, with substantially lower THRβ affinity than T3. The primary mechanism is direct, non-genomic action at mitochondria: 3,5-T2 binds cytochrome-c oxidase subunit Va and abolishes the allosteric inhibition of respiration by ATP, rapidly increasing oxygen consumption. In rodent studies, it activates the AMPK–ACC–malonyl-CoA signaling pathway, increasing mitochondrial fatty-acid oxidation and redirecting lipid partitioning toward oxidation.

Proposed to chemically cleave alpha-dicarbonyl carbon–carbon bonds within certain advanced glycation end-product (AGE) protein crosslinks, releasing crosslinked collagen and proteins in vascular and myocardial tissue and thereby reducing tissue stiffness. Additional proposed activities include methylglyoxal scavenging and metal chelation (e.g., inhibition of copper-catalyzed ascorbate oxidation); whether in vivo effects arise from AGE-crosslink cleavage versus metal chelation is unresolved. There is no evidence it cleaves glucosepane, considered the most abundant AGE crosslink in human tissue, which limits confidence in crosslink-breaking as the sole explanation for observed effects.