MEK inhibitors may slow cancer T cell burnout — SkimNews
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- Memorial Sloan Kettering researchers, publishing in Immunity, identified MEK signaling as a key driver of T cell exhaustion, showing in animal and lab studies that blocking MEK let T cells conserve energy, survive longer, and stay active in the harsh environment surrounding tumors.
- Santosha Vardhana, MD, PhD, the MSK physician-scientist who treats lymphoma patients and led the work, noted that FDA-approved MEK inhibitors already exist, meaning the approach could be tested in humans 'without much delay.'
- First author Tanmana Mitra, PhD overturned the prevailing view of exhausted T cells, finding they are highly active rather than metabolically sluggish — investing enormous resources into making cancer-killing proteins, reframing exhaustion as excessive energy demand rather than energy deficit.
- MEK inhibition carries a tradeoff: the immune attack may become less intense but cancer-fighting cells survive longer, making the approach best suited for patients with large tumors or few tumor-attacking immune cells rather than those with small, highly mutated tumors.
- MSK immunologist Andrea Schietinger, PhD previously established that T cell exhaustion can serve as a protective survival mechanism — a 'safe mode' that prevents overstimulation and cell death — complicating the goal of simply reversing exhaustion with a drug.
- MEK inhibitors have already shown effectiveness in melanoma when combined with checkpoint inhibitors and a BRAF inhibitor, and could potentially boost CAR T cell therapy, tumor-infiltrating lymphocyte (TIL) therapy, and bispecific antibodies.
Why it matters: Because FDA-approved MEK inhibitors are already on the market, this finding could translate to clinical trials quickly, offering a strategy to extend the cancer-killing window for patients whose tumors are too large or too sparsely recognized for traditional immunotherapy to eliminate on its own.
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