Programming the Body to Fight Cancer

“It's like thinking of a living drug that's a computer.” That’s how biomedical engineer Dr. Shreya Shukla describes CAR T-cell therapy on this episode of Curiosity Weekly. Instead of trying to kill cancer cells directly with chemicals or radiation, this approach takes a patient’s own immune cells, re-programs them in a lab, and infuses them back to hunt down malignancies. The episode also covers the sudden explosion of unregulated peptide supplements flooding social media, and a surprising discovery about how pigeons navigate on cloudy days using immune cells in their liver.

The Logic of CAR T-Cell Therapy

The immune system already patrols for cancer, but tumors evolve ways to hide. CAR T-cell therapy gives immune cells an upgrade. T cells — described by Shukla as “soldiers of the body” that can lie dormant in lymph nodes for decades before recognizing an old threat — are harvested from a patient’s blood. In a clean lab environment, scientists engineer them to express a synthetic receptor called a CAR (chimeric antigen receptor) that recognizes a specific protein on the surface of cancer cells. The engineered cells are multiplied, frozen, and shipped back to the hospital, where they are thawed and infused into the patient. The result is a living drug: billions of programmable cells that seek and destroy.