Witness Testimony

Dr. Steven Pelech, a biomedical scientist and professor of medicine at the University of British Columbia, testified regarding the molecular biology of mRNA COVID-19 vaccines. Drawing on his expertise in protein kinase signaling and cellular regulatory pathways, he described how lipid nanoparticles deliver modified mRNA into host cells, resulting in intracellular production of spike protein. He explained that spike protein is biologically active and capable of interacting with cellular signaling systems beyond its role in viral entry, potentially influencing inflammatory and vascular pathways.
He testified that biodistribution studies indicate the lipid nanoparticle–mRNA complexes may not remain confined to the injection site and can reach multiple tissues. He raised concerns regarding variability in mRNA translation levels, persistence of spike protein expression, and the potential for unintended off-target effects on kinase signaling cascades. He described theoretical mechanisms involving dysregulation of intracellular signaling networks, inflammatory responses, and possible endothelial or vascular implications.
Dr. Pelech further discussed regulatory oversight and preclinical evaluation standards, stating that comprehensive molecular pharmacology and long-term safety testing are typically required for novel biologic platforms. He argued that broader independent mechanistic investigation is warranted to determine whether adverse events could be linked to spike-mediated cellular signaling effects. He concluded that continued research and transparent regulatory review are necessary to fully understand potential molecular consequences of repeated mRNA exposure.