Theranostic Applications of Porphyrin-Based Nanoplatforms

Porphyrin-based nanoplatforms have emerged as versatile agents that integrate diagnostic imaging and therapeutic modalities within a single molecular scaffold. Their tetrapyrrolic core confers strong absorption in the red to near-infrared region, high singlet oxygen quantum yield and facile coordination of metal ions, which can be harnessed for photodynamic therapy, photothermal therapy, magnetic resonance contrast and radionuclide labelling. By conjugating to biomacromolecules or encapsulating within nanostructures such as mesoporous silica or polymeric carriers, porphyrin systems attain improved water solubility, prolonged circulation times and active targeting of pathological sites. Stimuli-responsive linkers enable controlled release or “turn-on” fluorescence and therapeutic action in response to pH, enzyme activity or light. Multimodal imaging combining fluorescence, photoacoustic, magnetic resonance and single-photon emission techniques allows real-time visualisation of biodistribution, treatment monitoring and post-therapeutic assessment. Together, these developments underline the global significance of porphyrin nanotheranostics as a bridge between precision diagnostics and minimally invasive therapies.

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Theranostic Applications of Porphyrin-Based Nanoplatforms publication trend

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Technical terms

Photodynamic therapy (PDT): Light-activated generation of reactive oxygen species by a photosensitiser to induce cell death.

Photothermal therapy (PTT): Conversion of light energy into heat by a chromophore to ablate pathological tissue.

Reactive oxygen species (ROS): Highly reactive molecules, including singlet oxygen, that mediate oxidative damage in cells.

Theranostics: The combination of diagnostic imaging and therapy within a unified agent or platform.

Mesoporous silica nanoparticles (MSNs): Porous inorganic carriers that encapsulate therapeutic and imaging agents, offering controlled release and surface functionalisation.

Photoacoustic imaging: A technique that detects ultrasound waves generated by pulsed light absorption, enabling deep­tissue visualisation.

References

1. Emerging Applications of Porphyrins and Metalloporphyrins in Biomedicine and Diagnostic Magnetic Resonance Imaging. Biosensors (2018).
2. Porphyrin as Diagnostic and Therapeutic Agent. Molecules (2019).
3. Rational design of an “all-in-one” phototheranostic. Chemical Science (2020).
4. Synthesis and Applications of Porphyrin-Biomacromolecule Conjugates. Frontiers in Chemistry (2021).
5. Structural Investigations, Cellular Imaging, and Radiolabeling of Neutral, Polycationic, and Polyanionic Functional Metalloporphyrin Conjugates. Bioconjugate Chemistry (2021).