Solid tumors commonly establish a localized acidic extracellular microenvironment that suppresses cytotoxic T‑cell effector function despite intact antigen recognition. Extracellular acidosis inhibits calcium signaling, perforin pore formation, metabolic activity, and immunological synapse stability, thereby limiting endogenous immune‑mediated clearance of malignant cells. Here, a minimal, non‑signaling strategy is proposed to transiently condition the acidic tumor microenvironment at the scale of the immunological synapse, restoring native T‑cell cytotoxic function without tumor targeting, cytokine delivery, immune cell engineering, or systemic alkalinization. The proposed system consists of a T‑cell‑hitchhiked, pH‑activated nano‑packet that remains inert at physiological pH and releases a diffusion‑restricted proton‑absorbing payload upon encountering tumor‑associated acidity. Local, transient pH normalization is intended to lift acid‑mediated suppression long enough to permit effective perforin‑ and granzyme‑dependent tumor cell killing using existing immune mechanisms. This work presents an experimentally testable hypothesis suitable for evaluation using standard tumor immunology models.
Rogers John (Fri,) studied this question.