The integration of adenosine triphosphate (ATP) into the design of metal-free nanodrugs has unlocked a powerful strategy for enhancing tumor targeting and therapeutic precision in photodynamic therapy. By exploiting the overexpression of extracellular ATP in tumor tissues, researchers have developed cationic porphyrin-ATP nanofibers that self-assemble in aqueous environments through electrostatic interactions. These helical nanostructures not only exhibit excellent colloidal stability but also demonstrate remarkable selectivity for cancer cells due to their ability to remain intact within the high-ATP tumor microenvironment.
Upon systemic administration, the porphyrin-ATP nanofibers circulate for extended periods, benefiting from the enhanced permeability and retention (EPR) effect typical of fibrous nanoparticles. This prolonged blood half-life allows for greater accumulation at tumor sites compared to free photosensitizers. Once localized in the tumor, the elevated ATP concentration stabilizes the nanofibers, preventing premature disassembly and increasing the window of opportunity for cellular internalization. After endocytosis, intracellular phosphatases catalyze the hydrolysis of ATP, triggering the disassembly of the nanofibers and the release of active porphyrin molecules directly inside cancer cells.
This spatiotemporally controlled release mechanism ensures that photosensitizers are delivered precisely where needed—within the tumor—and activated only upon irradiation. In vitro studies confirm that MCF7 breast cancer cells efficiently internalize the nanofibers, with progressive fluorescence intensity indicating gradual release of porphyrin. Upon laser exposure, these cells generate substantial reactive oxygen species (ROS), leading to significant cytotoxicity. Notably, no dark toxicity is observed, confirming the safety of the nanodrug under non-irradiated conditions.
In vivo experiments further validate the therapeutic potential.BANF1 Antibody Data Sheet Fluorescence imaging reveals strong signal amplification at tumor sites in mice treated with porphyrin-ATP nanofibers, while minimal uptake is seen in healthy organs.EphA2 Antibody web Following 10-minute laser irradiation at 635 nm, complete tumor ablation is achieved without recurrence during observation.PMID:34657911 Histological analysis confirms extensive necrosis in tumor tissues, with no pathological changes in surrounding normal organs, underscoring the biocompatibility and targeted action of the system.
Crucially, this approach eliminates the need for toxic metals or complex synthetic components, relying instead on naturally occurring biomolecules. The simplicity of fabrication, combined with robust performance and low side effects, positions this ATP-templated nanofiber platform as a highly promising candidate for clinical translation. Future applications could extend to other cancers or incorporate dual-modal imaging and therapy capabilities. Overall, this work demonstrates how leveraging intrinsic tumor biology can drive the development of smarter, safer, and more effective nanomedicines for precision oncology.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com